restucturization of recipients payment methods

This reverts commit 5f4184760d, reversing
changes made to 5e1da9617f.

Reverting changes on main

.gitignore

@@ -0,0 +1,11 @@
+.env.version
+*.pb.go
+*.pb.gw.go
+pubspec.lock
+.DS_Store
+analysis_options.yaml
+devtools_options.yaml
+untranslated.txt
+generate_protos.sh
+update_dep.sh
+.vscode/

.woodpecker/bff.yml

@@ -0,0 +1,74 @@
+matrix:
+  include:
+    - BFF_IMAGE_PATH: bff/service
+      BFF_DOCKERFILE: ci/prod/compose/bff.dockerfile
+      BFF_MONGO_SECRET_PATH: sendico/db
+      BFF_API_SECRET_PATH: sendico/api/endpoint
+      BFF_ENV: prod
+
+when:
+  - event: push
+    branch: main
+
+steps:
+  - name: version
+    image: alpine:latest
+    commands:
+      - set -euo pipefail 2>/dev/null || set -eu
+      - apk add --no-cache git
+      - GIT_REV="$(git rev-parse --short HEAD)"
+      - BUILD_BRANCH="$(git rev-parse --abbrev-ref HEAD)"
+      - APP_V="$(cat version)"
+      - BUILD_DATE="$(date -u +%Y-%m-%dT%H:%M:%SZ)"
+      - BUILD_USER="${WOODPECKER_MACHINE:-woodpecker}"
+      - printf "GIT_REV=%s\nBUILD_BRANCH=%s\nAPP_V=%s\nBUILD_DATE=%s\nBUILD_USER=%s\n" \
+          "$GIT_REV" "$BUILD_BRANCH" "$APP_V" "$BUILD_DATE" "$BUILD_USER" | tee .env.version
+
+  - name: proto
+    image: golang:alpine
+    depends_on: [ version ]
+    commands:
+      - set -eu
+      - apk add --no-cache bash git build-base protoc protobuf-dev
+      - go install google.golang.org/protobuf/cmd/protoc-gen-go@latest
+      - go install google.golang.org/grpc/cmd/protoc-gen-go-grpc@latest
+      - export PATH="$(go env GOPATH)/bin:$PATH"
+      - bash ci/scripts/proto/generate.sh
+
+  - name: secrets
+    image: alpine:latest
+    depends_on: [ version ]
+    environment:
+      VAULT_ADDR: { from_secret: VAULT_ADDR }
+      VAULT_ROLE_ID:   { from_secret: VAULT_APP_ROLE }
+      VAULT_SECRET_ID: { from_secret: VAULT_SECRET_ID }
+    commands:
+      - set -euo pipefail
+      - apk add --no-cache bash coreutils openssh-keygen curl sed python3
+      - mkdir -p secrets
+      - ./ci/vlt kv_to_file kv ops/deploy/ssh_key private_b64 secrets/SSH_KEY.b64 600
+      - base64 -d secrets/SSH_KEY.b64 > secrets/SSH_KEY
+      - chmod 600 secrets/SSH_KEY
+      - ssh-keygen -y -f secrets/SSH_KEY >/dev/null
+      - ./ci/vlt kv_get kv registry user > secrets/REGISTRY_USER
+      - ./ci/vlt kv_get kv registry password > secrets/REGISTRY_PASSWORD
+
+  - name: build-image
+    image: gcr.io/kaniko-project/executor:debug
+    depends_on: [ proto, secrets ]
+    commands:
+      - sh ci/scripts/bff/build-image.sh
+
+  - name: deploy
+    image: alpine:latest
+    depends_on: [ secrets, build-image ]
+    environment:
+      VAULT_ADDR: { from_secret: VAULT_ADDR }
+      VAULT_ROLE_ID:   { from_secret: VAULT_APP_ROLE }
+      VAULT_SECRET_ID: { from_secret: VAULT_SECRET_ID }
+    commands:
+      - set -euo pipefail
+      - apk add --no-cache bash openssh-client rsync coreutils curl sed python3
+      - mkdir -p /root/.ssh
+      - install -m 600 secrets/SSH_KEY /root/.ssh/id_rsa
+      - sh ci/scripts/bff/deploy.sh

.woodpecker/billing_fees.yml

@@ -0,0 +1,73 @@
+matrix:
+  include:
+    - FEES_IMAGE_PATH: billing/fees
+      FEES_DOCKERFILE: ci/prod/compose/billing_fees.dockerfile
+      FEES_MONGO_SECRET_PATH: sendico/db
+      FEES_ENV: prod
+
+when:
+  - event: push
+    branch: main
+
+steps:
+  - name: version
+    image: alpine:latest
+    commands:
+      - set -euo pipefail 2>/dev/null || set -eu
+      - apk add --no-cache git
+      - GIT_REV="$(git rev-parse --short HEAD)"
+      - BUILD_BRANCH="$(git rev-parse --abbrev-ref HEAD)"
+      - APP_V="$(cat version)"
+      - BUILD_DATE="$(date -u +%Y-%m-%dT%H:%M:%SZ)"
+      - BUILD_USER="${WOODPECKER_MACHINE:-woodpecker}"
+      - printf "GIT_REV=%s\nBUILD_BRANCH=%s\nAPP_V=%s\nBUILD_DATE=%s\nBUILD_USER=%s\n" \
+          "$GIT_REV" "$BUILD_BRANCH" "$APP_V" "$BUILD_DATE" "$BUILD_USER" | tee .env.version
+
+  - name: proto
+    image: golang:alpine
+    depends_on: [ version ]
+    commands:
+      - set -eu
+      - apk add --no-cache bash git build-base protoc protobuf-dev
+      - go install google.golang.org/protobuf/cmd/protoc-gen-go@latest
+      - go install google.golang.org/grpc/cmd/protoc-gen-go-grpc@latest
+      - export PATH="$(go env GOPATH)/bin:$PATH"
+      - bash ci/scripts/proto/generate.sh
+
+  - name: secrets
+    image: alpine:latest
+    depends_on: [ version ]
+    environment:
+      VAULT_ADDR: { from_secret: VAULT_ADDR }
+      VAULT_ROLE_ID:   { from_secret: VAULT_APP_ROLE }
+      VAULT_SECRET_ID: { from_secret: VAULT_SECRET_ID }
+    commands:
+      - set -euo pipefail
+      - apk add --no-cache bash coreutils openssh-keygen curl sed python3
+      - mkdir -p secrets
+      - ./ci/vlt kv_to_file kv ops/deploy/ssh_key private_b64 secrets/SSH_KEY.b64 600
+      - base64 -d secrets/SSH_KEY.b64 > secrets/SSH_KEY
+      - chmod 600 secrets/SSH_KEY
+      - ssh-keygen -y -f secrets/SSH_KEY >/dev/null
+      - ./ci/vlt kv_get kv registry user > secrets/REGISTRY_USER
+      - ./ci/vlt kv_get kv registry password > secrets/REGISTRY_PASSWORD
+
+  - name: build-image
+    image: gcr.io/kaniko-project/executor:debug
+    depends_on: [ proto, secrets ]
+    commands:
+      - sh ci/scripts/billing_fees/build-image.sh
+
+  - name: deploy
+    image: alpine:latest
+    depends_on: [ secrets, build-image ]
+    environment:
+      VAULT_ADDR: { from_secret: VAULT_ADDR }
+      VAULT_ROLE_ID:   { from_secret: VAULT_APP_ROLE }
+      VAULT_SECRET_ID: { from_secret: VAULT_SECRET_ID }
+    commands:
+      - set -euo pipefail
+      - apk add --no-cache bash openssh-client rsync coreutils curl sed python3
+      - mkdir -p /root/.ssh
+      - install -m 600 secrets/SSH_KEY /root/.ssh/id_rsa
+      - sh ci/scripts/billing_fees/deploy.sh

.woodpecker/chain_gateway.yml

@@ -0,0 +1,76 @@
+matrix:
+  include:
+    - CHAIN_GATEWAY_IMAGE_PATH: gateway/chain
+      CHAIN_GATEWAY_DOCKERFILE: ci/prod/compose/chain_gateway.dockerfile
+      CHAIN_GATEWAY_MONGO_SECRET_PATH: sendico/db
+      CHAIN_GATEWAY_RPC_SECRET_PATH: sendico/gateway/chain
+      CHAIN_GATEWAY_WALLET_SECRET_PATH: sendico/gateway/chain/wallet
+      CHAIN_GATEWAY_VAULT_SECRET_PATH: sendico/gateway/chain/vault
+      CHAIN_GATEWAY_ENV: prod
+
+when:
+  - event: push
+    branch: main
+
+steps:
+  - name: version
+    image: alpine:latest
+    commands:
+      - set -euo pipefail 2>/dev/null || set -eu
+      - apk add --no-cache git
+      - GIT_REV="$(git rev-parse --short HEAD)"
+      - BUILD_BRANCH="$(git rev-parse --abbrev-ref HEAD)"
+      - APP_V="$(cat version)"
+      - BUILD_DATE="$(date -u +%Y-%m-%dT%H:%M:%SZ)"
+      - BUILD_USER="${WOODPECKER_MACHINE:-woodpecker}"
+      - printf "GIT_REV=%s\nBUILD_BRANCH=%s\nAPP_V=%s\nBUILD_DATE=%s\nBUILD_USER=%s\n" \
+          "$GIT_REV" "$BUILD_BRANCH" "$APP_V" "$BUILD_DATE" "$BUILD_USER" | tee .env.version
+
+  - name: proto
+    image: golang:alpine
+    depends_on: [ version ]
+    commands:
+      - set -eu
+      - apk add --no-cache bash git build-base protoc protobuf-dev
+      - go install google.golang.org/protobuf/cmd/protoc-gen-go@latest
+      - go install google.golang.org/grpc/cmd/protoc-gen-go-grpc@latest
+      - export PATH="$(go env GOPATH)/bin:$PATH"
+      - bash ci/scripts/proto/generate.sh
+
+  - name: secrets
+    image: alpine:latest
+    depends_on: [ version ]
+    environment:
+      VAULT_ADDR: { from_secret: VAULT_ADDR }
+      VAULT_ROLE_ID:   { from_secret: VAULT_APP_ROLE }
+      VAULT_SECRET_ID: { from_secret: VAULT_SECRET_ID }
+    commands:
+      - set -euo pipefail
+      - apk add --no-cache bash coreutils openssh-keygen curl sed python3
+      - mkdir -p secrets
+      - ./ci/vlt kv_to_file kv ops/deploy/ssh_key private_b64 secrets/SSH_KEY.b64 600
+      - base64 -d secrets/SSH_KEY.b64 > secrets/SSH_KEY
+      - chmod 600 secrets/SSH_KEY
+      - ssh-keygen -y -f secrets/SSH_KEY >/dev/null
+      - ./ci/vlt kv_get kv registry user > secrets/REGISTRY_USER
+      - ./ci/vlt kv_get kv registry password > secrets/REGISTRY_PASSWORD
+
+  - name: build-image
+    image: gcr.io/kaniko-project/executor:debug
+    depends_on: [ proto, secrets ]
+    commands:
+      - sh ci/scripts/chain_gateway/build-image.sh
+
+  - name: deploy
+    image: alpine:latest
+    depends_on: [ secrets, build-image ]
+    environment:
+      VAULT_ADDR: { from_secret: VAULT_ADDR }
+      VAULT_ROLE_ID:   { from_secret: VAULT_APP_ROLE }
+      VAULT_SECRET_ID: { from_secret: VAULT_SECRET_ID }
+    commands:
+      - set -euo pipefail
+      - apk add --no-cache bash openssh-client rsync coreutils curl sed python3
+      - mkdir -p /root/.ssh
+      - install -m 600 secrets/SSH_KEY /root/.ssh/id_rsa
+      - sh ci/scripts/chain_gateway/deploy.sh

.woodpecker/db.yml

@@ -0,0 +1,52 @@
+when:
+  - event: push
+    branch: main
+
+steps:
+  - name: version
+    image: alpine:latest
+    commands:
+      - set -euo pipefail
+      - apk add --no-cache git
+      - GIT_REV="$(git rev-parse --short HEAD)"
+      - BUILD_BRANCH="$(git rev-parse --abbrev-ref HEAD)"
+      - APP_V="$(cat version)"
+      - printf "GIT_REV=%s\nBUILD_BRANCH=%s\nAPP_V=%s\n" "$GIT_REV" "$BUILD_BRANCH" "$APP_V" | tee .env.version
+
+  - name: secrets
+    image: alpine:latest
+    depends_on: [ version ]
+    environment:
+      # CI's own AppRole creds for accessing Vault to fetch the SSH key (existing names)
+      VAULT_ADDR: { from_secret: VAULT_ADDR }
+      VAULT_ROLE_ID:   { from_secret: VAULT_APP_ROLE }
+      VAULT_SECRET_ID: { from_secret: VAULT_SECRET_ID }
+    commands:
+      - set -euo pipefail
+      - apk add --no-cache bash coreutils openssh-keygen curl sed python3
+      - mkdir -p secrets
+      # Retrieve SSH private key for deploy (existing helper)
+      - ./ci/vlt kv_to_file kv ops/deploy/ssh_key private_b64 secrets/SSH_KEY.b64 600
+      - base64 -d secrets/SSH_KEY.b64 > secrets/SSH_KEY
+      - chmod 600 secrets/SSH_KEY
+      - ssh-keygen -y -f secrets/SSH_KEY >/dev/null
+
+  - name: deploy
+    image: alpine:latest
+    depends_on: [ secrets ]
+    # Reuse the SAME Woodpecker secrets to pass AppRole to the Vault Agent at runtime
+    environment:
+      VAULT_ROLE_ID:   { from_secret: VAULT_APP_ROLE }
+      VAULT_SECRET_ID: { from_secret: VAULT_SECRET_ID }
+    commands:
+      - set -euo pipefail
+      - apk add --no-cache bash openssh-client rsync coreutils
+      - mkdir -p /root/.ssh
+      - install -m 600 secrets/SSH_KEY /root/.ssh/id_rsa
+      - sed -i 's/\r$//' ./ci/prod/.env.runtime
+      - set -a
+      - . ./ci/prod/.env.runtime
+      - . ./.env.version
+      - set +a
+      - bash ci/prod/scripts/bootstrap/network.sh
+      - bash ci/prod/scripts/deploy/db.sh

.woodpecker/frontend.yml

@@ -0,0 +1,61 @@
+matrix:
+  include:
+    - FRONTEND_IMAGE_PATH: frontend/service
+      FRONTEND_DOCKERFILE: ci/prod/compose/frontend.dockerfile
+      FRONTEND_ENV: prod
+
+when:
+  - event: push
+    branch: main
+
+steps:
+  - name: version
+    image: alpine:latest
+    commands:
+      - set -euo pipefail 2>/dev/null || set -eu
+      - apk add --no-cache git
+      - GIT_REV="$(git rev-parse --short HEAD)"
+      - BUILD_BRANCH="$(git rev-parse --abbrev-ref HEAD)"
+      - APP_V="$(cat version)"
+      - BUILD_DATE="$(date -u +%Y-%m-%dT%H:%M:%SZ)"
+      - BUILD_USER="${WOODPECKER_MACHINE:-woodpecker}"
+      - printf "GIT_REV=%s\nBUILD_BRANCH=%s\nAPP_V=%s\nBUILD_DATE=%s\nBUILD_USER=%s\n" \
+          "$GIT_REV" "$BUILD_BRANCH" "$APP_V" "$BUILD_DATE" "$BUILD_USER" | tee .env.version
+
+  - name: secrets
+    image: alpine:latest
+    depends_on: [ version ]
+    environment:
+      VAULT_ADDR: { from_secret: VAULT_ADDR }
+      VAULT_ROLE_ID:   { from_secret: VAULT_APP_ROLE }
+      VAULT_SECRET_ID: { from_secret: VAULT_SECRET_ID }
+    commands:
+      - set -euo pipefail
+      - apk add --no-cache bash coreutils openssh-keygen curl sed python3
+      - mkdir -p secrets
+      - ./ci/vlt kv_to_file kv ops/deploy/ssh_key private_b64 secrets/SSH_KEY.b64 600
+      - base64 -d secrets/SSH_KEY.b64 > secrets/SSH_KEY
+      - chmod 600 secrets/SSH_KEY
+      - ssh-keygen -y -f secrets/SSH_KEY >/dev/null
+      - ./ci/vlt kv_get kv registry user > secrets/REGISTRY_USER
+      - ./ci/vlt kv_get kv registry password > secrets/REGISTRY_PASSWORD
+
+  - name: build-image
+    image: gcr.io/kaniko-project/executor:debug
+    depends_on: [ version, secrets ]
+    commands:
+      - sh ci/scripts/frontend/build-image.sh
+
+  - name: deploy
+    image: alpine:latest
+    depends_on: [ secrets, build-image ]
+    environment:
+      VAULT_ADDR: { from_secret: VAULT_ADDR }
+      VAULT_ROLE_ID:   { from_secret: VAULT_APP_ROLE }
+      VAULT_SECRET_ID: { from_secret: VAULT_SECRET_ID }
+    commands:
+      - set -euo pipefail
+      - apk add --no-cache bash openssh-client rsync coreutils curl sed python3
+      - mkdir -p /root/.ssh
+      - install -m 600 secrets/SSH_KEY /root/.ssh/id_rsa
+      - sh ci/scripts/frontend/deploy.sh

.woodpecker/fx_ingestor.yml

@@ -0,0 +1,77 @@
+matrix:
+  include:
+    - FX_PIPELINE: fx_ingestor
+      FX_IMAGE_PATH: fx/ingestor
+      FX_DOCKERFILE: ci/prod/compose/fx_ingestor.dockerfile
+      FX_DEPLOY_TARGET: ingestor
+      FX_MONGO_SECRET_PATH: sendico/db
+      FX_NEEDS_NATS: "false"
+      FX_ENV: prod
+
+when:
+  - event: push
+    branch: main
+
+steps:
+  - name: version
+    image: alpine:latest
+    commands:
+      - set -euo pipefail 2>/dev/null || set -eu
+      - apk add --no-cache git
+      - GIT_REV="$(git rev-parse --short HEAD)"
+      - BUILD_BRANCH="$(git rev-parse --abbrev-ref HEAD)"
+      - APP_V="$(cat version)"
+      - BUILD_DATE="$(date -u +%Y-%m-%dT%H:%M:%SZ)"
+      - BUILD_USER="${WOODPECKER_MACHINE:-woodpecker}"
+      - printf "GIT_REV=%s\nBUILD_BRANCH=%s\nAPP_V=%s\nBUILD_DATE=%s\nBUILD_USER=%s\n" \
+          "$GIT_REV" "$BUILD_BRANCH" "$APP_V" "$BUILD_DATE" "$BUILD_USER" | tee .env.version
+
+  - name: proto
+    image: golang:alpine
+    depends_on: [ version ]
+    commands:
+      - set -eu
+      # protoc + headers; protobuf runtime pkg is not needed for codegen
+      - apk add --no-cache bash git build-base protoc protobuf-dev
+      - go install google.golang.org/protobuf/cmd/protoc-gen-go@latest
+      - go install google.golang.org/grpc/cmd/protoc-gen-go-grpc@latest
+      - export PATH="$(go env GOPATH)/bin:$PATH"
+      - bash ci/scripts/proto/generate.sh
+
+  - name: secrets
+    image: alpine:latest
+    depends_on: [ version ]
+    environment:
+      VAULT_ADDR: { from_secret: VAULT_ADDR }
+      VAULT_ROLE_ID:   { from_secret: VAULT_APP_ROLE }
+      VAULT_SECRET_ID: { from_secret: VAULT_SECRET_ID }
+    commands:
+      - set -euo pipefail
+      - apk add --no-cache bash coreutils openssh-keygen curl sed python3
+      - mkdir -p secrets
+      - ./ci/vlt kv_to_file kv ops/deploy/ssh_key private_b64 secrets/SSH_KEY.b64 600
+      - base64 -d secrets/SSH_KEY.b64 > secrets/SSH_KEY
+      - chmod 600 secrets/SSH_KEY
+      - ssh-keygen -y -f secrets/SSH_KEY >/dev/null
+      - ./ci/vlt kv_get kv registry user > secrets/REGISTRY_USER
+      - ./ci/vlt kv_get kv registry password > secrets/REGISTRY_PASSWORD
+
+  - name: build-image
+    image: gcr.io/kaniko-project/executor:debug
+    depends_on: [ proto, secrets ]
+    commands:
+      - sh ci/scripts/fx/build-image.sh
+
+  - name: deploy
+    image: alpine:latest
+    depends_on: [ secrets, build-image ]
+    environment:
+      VAULT_ADDR: { from_secret: VAULT_ADDR }
+      VAULT_ROLE_ID:   { from_secret: VAULT_APP_ROLE }
+      VAULT_SECRET_ID: { from_secret: VAULT_SECRET_ID }
+    commands:
+      - set -euo pipefail
+      - apk add --no-cache bash openssh-client rsync coreutils curl sed python3
+      - mkdir -p /root/.ssh
+      - install -m 600 secrets/SSH_KEY /root/.ssh/id_rsa
+      - sh ci/scripts/fx/deploy.sh

.woodpecker/fx_oracle.yml

@@ -0,0 +1,77 @@
+matrix:
+  include:
+    - FX_PIPELINE: fx_oracle
+      FX_IMAGE_PATH: fx/oracle
+      FX_DOCKERFILE: ci/prod/compose/fx_oracle.dockerfile
+      FX_DEPLOY_TARGET: oracle
+      FX_MONGO_SECRET_PATH: sendico/db
+      FX_NEEDS_NATS: "true"
+      FX_ENV: prod
+
+when:
+  - event: push
+    branch: main
+
+steps:
+  - name: version
+    image: alpine:latest
+    commands:
+      - set -euo pipefail 2>/dev/null || set -eu
+      - apk add --no-cache git
+      - GIT_REV="$(git rev-parse --short HEAD)"
+      - BUILD_BRANCH="$(git rev-parse --abbrev-ref HEAD)"
+      - APP_V="$(cat version)"
+      - BUILD_DATE="$(date -u +%Y-%m-%dT%H:%M:%SZ)"
+      - BUILD_USER="${WOODPECKER_MACHINE:-woodpecker}"
+      - printf "GIT_REV=%s\nBUILD_BRANCH=%s\nAPP_V=%s\nBUILD_DATE=%s\nBUILD_USER=%s\n" \
+          "$GIT_REV" "$BUILD_BRANCH" "$APP_V" "$BUILD_DATE" "$BUILD_USER" | tee .env.version
+
+  - name: proto
+    image: golang:alpine
+    depends_on: [ version ]
+    commands:
+      - set -eu
+      # protoc + headers; protobuf runtime pkg is not needed for codegen
+      - apk add --no-cache bash git build-base protoc protobuf-dev
+      - go install google.golang.org/protobuf/cmd/protoc-gen-go@latest
+      - go install google.golang.org/grpc/cmd/protoc-gen-go-grpc@latest
+      - export PATH="$(go env GOPATH)/bin:$PATH"
+      - bash ci/scripts/proto/generate.sh
+
+  - name: secrets
+    image: alpine:latest
+    depends_on: [ version ]
+    environment:
+      VAULT_ADDR: { from_secret: VAULT_ADDR }
+      VAULT_ROLE_ID:   { from_secret: VAULT_APP_ROLE }
+      VAULT_SECRET_ID: { from_secret: VAULT_SECRET_ID }
+    commands:
+      - set -euo pipefail
+      - apk add --no-cache bash coreutils openssh-keygen curl sed python3
+      - mkdir -p secrets
+      - ./ci/vlt kv_to_file kv ops/deploy/ssh_key private_b64 secrets/SSH_KEY.b64 600
+      - base64 -d secrets/SSH_KEY.b64 > secrets/SSH_KEY
+      - chmod 600 secrets/SSH_KEY
+      - ssh-keygen -y -f secrets/SSH_KEY >/dev/null
+      - ./ci/vlt kv_get kv registry user > secrets/REGISTRY_USER
+      - ./ci/vlt kv_get kv registry password > secrets/REGISTRY_PASSWORD
+
+  - name: build-image
+    image: gcr.io/kaniko-project/executor:debug
+    depends_on: [ proto, secrets ]
+    commands:
+      - sh ci/scripts/fx/build-image.sh
+
+  - name: deploy
+    image: alpine:latest
+    depends_on: [ secrets, build-image ]
+    environment:
+      VAULT_ADDR: { from_secret: VAULT_ADDR }
+      VAULT_ROLE_ID:   { from_secret: VAULT_APP_ROLE }
+      VAULT_SECRET_ID: { from_secret: VAULT_SECRET_ID }
+    commands:
+      - set -euo pipefail
+      - apk add --no-cache bash openssh-client rsync coreutils curl sed python3
+      - mkdir -p /root/.ssh
+      - install -m 600 secrets/SSH_KEY /root/.ssh/id_rsa
+      - sh ci/scripts/fx/deploy.sh

.woodpecker/ledger.yml

@@ -0,0 +1,73 @@
+matrix:
+  include:
+    - LEDGER_IMAGE_PATH: ledger/service
+      LEDGER_DOCKERFILE: ci/prod/compose/ledger.dockerfile
+      LEDGER_MONGO_SECRET_PATH: sendico/db
+      LEDGER_ENV: prod
+
+when:
+  - event: push
+    branch: main
+
+steps:
+  - name: version
+    image: alpine:latest
+    commands:
+      - set -euo pipefail 2>/dev/null || set -eu
+      - apk add --no-cache git
+      - GIT_REV="$(git rev-parse --short HEAD)"
+      - BUILD_BRANCH="$(git rev-parse --abbrev-ref HEAD)"
+      - APP_V="$(cat version)"
+      - BUILD_DATE="$(date -u +%Y-%m-%dT%H:%M:%SZ)"
+      - BUILD_USER="${WOODPECKER_MACHINE:-woodpecker}"
+      - printf "GIT_REV=%s\nBUILD_BRANCH=%s\nAPP_V=%s\nBUILD_DATE=%s\nBUILD_USER=%s\n" \
+          "$GIT_REV" "$BUILD_BRANCH" "$APP_V" "$BUILD_DATE" "$BUILD_USER" | tee .env.version
+
+  - name: proto
+    image: golang:alpine
+    depends_on: [ version ]
+    commands:
+      - set -eu
+      - apk add --no-cache bash git build-base protoc protobuf-dev
+      - go install google.golang.org/protobuf/cmd/protoc-gen-go@latest
+      - go install google.golang.org/grpc/cmd/protoc-gen-go-grpc@latest
+      - export PATH="$(go env GOPATH)/bin:$PATH"
+      - bash ci/scripts/proto/generate.sh
+
+  - name: secrets
+    image: alpine:latest
+    depends_on: [ version ]
+    environment:
+      VAULT_ADDR: { from_secret: VAULT_ADDR }
+      VAULT_ROLE_ID:   { from_secret: VAULT_APP_ROLE }
+      VAULT_SECRET_ID: { from_secret: VAULT_SECRET_ID }
+    commands:
+      - set -euo pipefail
+      - apk add --no-cache bash coreutils openssh-keygen curl sed python3
+      - mkdir -p secrets
+      - ./ci/vlt kv_to_file kv ops/deploy/ssh_key private_b64 secrets/SSH_KEY.b64 600
+      - base64 -d secrets/SSH_KEY.b64 > secrets/SSH_KEY
+      - chmod 600 secrets/SSH_KEY
+      - ssh-keygen -y -f secrets/SSH_KEY >/dev/null
+      - ./ci/vlt kv_get kv registry user > secrets/REGISTRY_USER
+      - ./ci/vlt kv_get kv registry password > secrets/REGISTRY_PASSWORD
+
+  - name: build-image
+    image: gcr.io/kaniko-project/executor:debug
+    depends_on: [ proto, secrets ]
+    commands:
+      - sh ci/scripts/ledger/build-image.sh
+
+  - name: deploy
+    image: alpine:latest
+    depends_on: [ secrets, build-image ]
+    environment:
+      VAULT_ADDR: { from_secret: VAULT_ADDR }
+      VAULT_ROLE_ID:   { from_secret: VAULT_APP_ROLE }
+      VAULT_SECRET_ID: { from_secret: VAULT_SECRET_ID }
+    commands:
+      - set -euo pipefail
+      - apk add --no-cache bash openssh-client rsync coreutils curl sed python3
+      - mkdir -p /root/.ssh
+      - install -m 600 secrets/SSH_KEY /root/.ssh/id_rsa
+      - sh ci/scripts/ledger/deploy.sh

.woodpecker/nats.yml

@@ -0,0 +1,52 @@
+when:
+  - event: push
+    branch: main
+
+steps:
+  - name: version
+    image: alpine:latest
+    commands:
+      - set -euo pipefail
+      - apk add --no-cache git
+      - GIT_REV="$(git rev-parse --short HEAD)"
+      - BUILD_BRANCH="$(git rev-parse --abbrev-ref HEAD)"
+      - APP_V="$(cat version)"
+      - printf "GIT_REV=%s\nBUILD_BRANCH=%s\nAPP_V=%s\n" "$GIT_REV" "$BUILD_BRANCH" "$APP_V" | tee .env.version
+
+  - name: secrets
+    image: alpine:latest
+    depends_on: [ version ]
+    environment:
+      VAULT_ADDR: { from_secret: VAULT_ADDR }
+      VAULT_ROLE_ID:   { from_secret: VAULT_APP_ROLE }
+      VAULT_SECRET_ID: { from_secret: VAULT_SECRET_ID }
+    commands:
+      - set -euo pipefail
+      - apk add --no-cache bash coreutils openssh-keygen curl sed python3
+      - mkdir -p secrets
+      - ./ci/vlt kv_to_file kv ops/deploy/ssh_key private_b64 secrets/SSH_KEY.b64 600
+      - base64 -d secrets/SSH_KEY.b64 > secrets/SSH_KEY
+      - chmod 600 secrets/SSH_KEY
+      - ssh-keygen -y -f secrets/SSH_KEY >/dev/null
+
+  - name: deploy
+    image: alpine:latest
+    depends_on: [ secrets ]
+    environment:
+      VAULT_ADDR: { from_secret: VAULT_ADDR }
+      VAULT_ROLE_ID:   { from_secret: VAULT_APP_ROLE }
+      VAULT_SECRET_ID: { from_secret: VAULT_SECRET_ID }
+    commands:
+      - set -euo pipefail
+      - apk add --no-cache bash openssh-client rsync coreutils curl sed python3
+      - mkdir -p /root/.ssh
+      - install -m 600 secrets/SSH_KEY /root/.ssh/id_rsa
+      - sed -i 's/\r$//' ./ci/prod/.env.runtime
+      - set -a
+      - . ./ci/prod/.env.runtime
+      - . ./.env.version
+      - set +a
+      - export NATS_USER="$(./ci/vlt kv_get kv sendico/nats user)"
+      - export NATS_PASSWORD="$(./ci/vlt kv_get kv sendico/nats password)"
+      - bash ci/prod/scripts/bootstrap/network.sh
+      - bash ci/prod/scripts/deploy/nats.sh

.woodpecker/notification.yml

@@ -0,0 +1,76 @@
+matrix:
+  include:
+    - NOTIFICATION_IMAGE_PATH: notification/service
+      NOTIFICATION_DOCKERFILE: ci/prod/compose/notification.dockerfile
+      NOTIFICATION_MONGO_SECRET_PATH: sendico/db
+      NOTIFICATION_MAIL_SECRET_PATH: sendico/notification/mail
+      NOTIFICATION_API_SECRET_PATH: sendico/api/endpoint
+      NOTIFICATION_TELEGRAM_SECRET_PATH: sendico/notification/telegram
+      NOTIFICATION_ENV: prod
+
+when:
+  - event: push
+    branch: main
+
+steps:
+  - name: version
+    image: alpine:latest
+    commands:
+      - set -euo pipefail 2>/dev/null || set -eu
+      - apk add --no-cache git
+      - GIT_REV="$(git rev-parse --short HEAD)"
+      - BUILD_BRANCH="$(git rev-parse --abbrev-ref HEAD)"
+      - APP_V="$(cat version)"
+      - BUILD_DATE="$(date -u +%Y-%m-%dT%H:%M:%SZ)"
+      - BUILD_USER="${WOODPECKER_MACHINE:-woodpecker}"
+      - printf "GIT_REV=%s\nBUILD_BRANCH=%s\nAPP_V=%s\nBUILD_DATE=%s\nBUILD_USER=%s\n" \
+          "$GIT_REV" "$BUILD_BRANCH" "$APP_V" "$BUILD_DATE" "$BUILD_USER" | tee .env.version
+
+  - name: proto
+    image: golang:alpine
+    depends_on: [ version ]
+    commands:
+      - set -eu
+      - apk add --no-cache bash git build-base protoc protobuf-dev
+      - go install google.golang.org/protobuf/cmd/protoc-gen-go@latest
+      - go install google.golang.org/grpc/cmd/protoc-gen-go-grpc@latest
+      - export PATH="$(go env GOPATH)/bin:$PATH"
+      - bash ci/scripts/proto/generate.sh
+
+  - name: secrets
+    image: alpine:latest
+    depends_on: [ version ]
+    environment:
+      VAULT_ADDR: { from_secret: VAULT_ADDR }
+      VAULT_ROLE_ID:   { from_secret: VAULT_APP_ROLE }
+      VAULT_SECRET_ID: { from_secret: VAULT_SECRET_ID }
+    commands:
+      - set -euo pipefail
+      - apk add --no-cache bash coreutils openssh-keygen curl sed python3
+      - mkdir -p secrets
+      - ./ci/vlt kv_to_file kv ops/deploy/ssh_key private_b64 secrets/SSH_KEY.b64 600
+      - base64 -d secrets/SSH_KEY.b64 > secrets/SSH_KEY
+      - chmod 600 secrets/SSH_KEY
+      - ssh-keygen -y -f secrets/SSH_KEY >/dev/null
+      - ./ci/vlt kv_get kv registry user > secrets/REGISTRY_USER
+      - ./ci/vlt kv_get kv registry password > secrets/REGISTRY_PASSWORD
+
+  - name: build-image
+    image: gcr.io/kaniko-project/executor:debug
+    depends_on: [ proto, secrets ]
+    commands:
+      - sh ci/scripts/notification/build-image.sh
+
+  - name: deploy
+    image: alpine:latest
+    depends_on: [ secrets, build-image ]
+    environment:
+      VAULT_ADDR: { from_secret: VAULT_ADDR }
+      VAULT_ROLE_ID:   { from_secret: VAULT_APP_ROLE }
+      VAULT_SECRET_ID: { from_secret: VAULT_SECRET_ID }
+    commands:
+      - set -euo pipefail
+      - apk add --no-cache bash openssh-client rsync coreutils curl sed python3
+      - mkdir -p /root/.ssh
+      - install -m 600 secrets/SSH_KEY /root/.ssh/id_rsa
+      - sh ci/scripts/notification/deploy.sh

.woodpecker/payments_orchestrator.yml

@@ -0,0 +1,73 @@
+matrix:
+  include:
+    - PAYMENTS_IMAGE_PATH: payments/orchestrator
+      PAYMENTS_DOCKERFILE: ci/prod/compose/payments_orchestrator.dockerfile
+      PAYMENTS_MONGO_SECRET_PATH: sendico/db
+      PAYMENTS_ENV: prod
+
+when:
+  - event: push
+    branch: main
+
+steps:
+  - name: version
+    image: alpine:latest
+    commands:
+      - set -euo pipefail 2>/dev/null || set -eu
+      - apk add --no-cache git
+      - GIT_REV="$(git rev-parse --short HEAD)"
+      - BUILD_BRANCH="$(git rev-parse --abbrev-ref HEAD)"
+      - APP_V="$(cat version)"
+      - BUILD_DATE="$(date -u +%Y-%m-%dT%H:%M:%SZ)"
+      - BUILD_USER="${WOODPECKER_MACHINE:-woodpecker}"
+      - printf "GIT_REV=%s\nBUILD_BRANCH=%s\nAPP_V=%s\nBUILD_DATE=%s\nBUILD_USER=%s\n" \
+          "$GIT_REV" "$BUILD_BRANCH" "$APP_V" "$BUILD_DATE" "$BUILD_USER" | tee .env.version
+
+  - name: proto
+    image: golang:alpine
+    depends_on: [ version ]
+    commands:
+      - set -eu
+      - apk add --no-cache bash git build-base protoc protobuf-dev
+      - go install google.golang.org/protobuf/cmd/protoc-gen-go@latest
+      - go install google.golang.org/grpc/cmd/protoc-gen-go-grpc@latest
+      - export PATH="$(go env GOPATH)/bin:$PATH"
+      - bash ci/scripts/proto/generate.sh
+
+  - name: secrets
+    image: alpine:latest
+    depends_on: [ version ]
+    environment:
+      VAULT_ADDR: { from_secret: VAULT_ADDR }
+      VAULT_ROLE_ID:   { from_secret: VAULT_APP_ROLE }
+      VAULT_SECRET_ID: { from_secret: VAULT_SECRET_ID }
+    commands:
+      - set -euo pipefail
+      - apk add --no-cache bash coreutils openssh-keygen curl sed python3
+      - mkdir -p secrets
+      - ./ci/vlt kv_to_file kv ops/deploy/ssh_key private_b64 secrets/SSH_KEY.b64 600
+      - base64 -d secrets/SSH_KEY.b64 > secrets/SSH_KEY
+      - chmod 600 secrets/SSH_KEY
+      - ssh-keygen -y -f secrets/SSH_KEY >/dev/null
+      - ./ci/vlt kv_get kv registry user > secrets/REGISTRY_USER
+      - ./ci/vlt kv_get kv registry password > secrets/REGISTRY_PASSWORD
+
+  - name: build-image
+    image: gcr.io/kaniko-project/executor:debug
+    depends_on: [ proto, secrets ]
+    commands:
+      - sh ci/scripts/payments_orchestrator/build-image.sh
+
+  - name: deploy
+    image: alpine:latest
+    depends_on: [ secrets, build-image ]
+    environment:
+      VAULT_ADDR: { from_secret: VAULT_ADDR }
+      VAULT_ROLE_ID:   { from_secret: VAULT_APP_ROLE }
+      VAULT_SECRET_ID: { from_secret: VAULT_SECRET_ID }
+    commands:
+      - set -euo pipefail
+      - apk add --no-cache bash openssh-client rsync coreutils curl sed python3
+      - mkdir -p /root/.ssh
+      - install -m 600 secrets/SSH_KEY /root/.ssh/id_rsa
+      - sh ci/scripts/payments_orchestrator/deploy.sh

api/billing/fees/.air.toml

@@ -0,0 +1,32 @@
+# Config file for Air in TOML format
+
+root = "./../.."
+tmp_dir = "tmp"
+
+[build]
+cmd = "go build -o app -ldflags \"-X 'github.com/tech/sendico/billing/fees/internal/appversion.BuildUser=$(whoami)' -X 'github.com/tech/sendico/billing/fees/internal/appversion.Version=$APP_V' -X 'github.com/tech/sendico/billing/fees/internal/appversion.Branch=$BUILD_BRANCH' -X 'github.com/tech/sendico/billing/fees/internal/appversion.Revision=$GIT_REV' -X 'github.com/tech/sendico/billing/fees/internal/appversion.BuildDate=$(date)'\""
+bin = "./app"
+full_bin = "./app --debug --config.file=config.yml"
+include_ext = ["go", "yaml", "yml"]
+exclude_dir = ["billing/fees/tmp", "pkg/.git", "billing/fees/env"]
+exclude_regex = ["_test\\.go"]
+exclude_unchanged = true
+follow_symlink = true
+log = "air.log"
+delay = 0
+stop_on_error = true
+send_interrupt = true
+kill_delay = 500
+args_bin = []
+
+[log]
+time = false
+
+[color]
+main = "magenta"
+watcher = "cyan"
+build = "yellow"
+runner = "green"
+
+[misc]
+clean_on_exit = true

api/billing/fees/.gitignore

@@ -0,0 +1,3 @@
+internal/generated
+.gocache
+/app

api/billing/fees/config.yml

@@ -0,0 +1,40 @@
+runtime:
+  shutdown_timeout_seconds: 15
+
+grpc:
+  network: tcp
+  address: ":50060"
+  enable_reflection: true
+  enable_health: true
+
+metrics:
+  address: ":9402"
+
+database:
+  driver: mongodb
+  settings:
+    host_env: FEES_MONGO_HOST
+    port_env: FEES_MONGO_PORT
+    database_env: FEES_MONGO_DATABASE
+    user_env: FEES_MONGO_USER
+    password_env: FEES_MONGO_PASSWORD
+    auth_source_env: FEES_MONGO_AUTH_SOURCE
+    replica_set_env: FEES_MONGO_REPLICA_SET
+
+messaging:
+  driver: NATS
+  settings:
+    url_env: NATS_URL
+    host_env: NATS_HOST
+    port_env: NATS_PORT
+    username_env: NATS_USER
+    password_env: NATS_PASSWORD
+    broker_name: Billing Fees Service
+    max_reconnects: 10
+    reconnect_wait: 5
+
+oracle:
+  address: "sendico_fx_oracle:50051"
+  dial_timeout_seconds: 5
+  call_timeout_seconds: 3
+  insecure: true

api/billing/fees/env/.gitignore

@@ -0,0 +1 @@
+.env.api

api/billing/fees/go.mod

@@ -0,0 +1,54 @@
+module github.com/tech/sendico/billing/fees
+
+go 1.25.3
+
+replace github.com/tech/sendico/pkg => ../../pkg
+
+replace github.com/tech/sendico/fx/oracle => ../../fx/oracle
+
+require (
+	github.com/tech/sendico/fx/oracle v0.0.0
+	github.com/tech/sendico/pkg v0.1.0
+	go.mongodb.org/mongo-driver v1.17.6
+	go.uber.org/zap v1.27.1
+	google.golang.org/grpc v1.77.0
+	gopkg.in/yaml.v3 v3.0.1
+)
+
+require (
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/bmatcuk/doublestar/v4 v4.9.1 // indirect
+	github.com/casbin/casbin/v2 v2.134.0 // indirect
+	github.com/casbin/govaluate v1.10.0 // indirect
+	github.com/casbin/mongodb-adapter/v3 v3.7.0 // indirect
+	github.com/cespare/xxhash/v2 v2.3.0 // indirect
+	github.com/go-chi/chi/v5 v5.2.3 // indirect
+	github.com/golang/snappy v1.0.0 // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	github.com/klauspost/compress v1.18.2 // indirect
+	github.com/mattn/go-colorable v0.1.14 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/mitchellh/mapstructure v1.5.0 // indirect
+	github.com/montanaflynn/stats v0.7.1 // indirect
+	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
+	github.com/nats-io/nats.go v1.47.0 // indirect
+	github.com/nats-io/nkeys v0.4.12 // indirect
+	github.com/nats-io/nuid v1.0.1 // indirect
+	github.com/prometheus/client_golang v1.23.2
+	github.com/prometheus/client_model v0.6.2 // indirect
+	github.com/prometheus/common v0.67.4 // indirect
+	github.com/prometheus/procfs v0.19.2 // indirect
+	github.com/xdg-go/pbkdf2 v1.0.0 // indirect
+	github.com/xdg-go/scram v1.2.0 // indirect
+	github.com/xdg-go/stringprep v1.0.4 // indirect
+	github.com/youmark/pkcs8 v0.0.0-20240726163527-a2c0da244d78 // indirect
+	go.uber.org/multierr v1.11.0 // indirect
+	go.yaml.in/yaml/v2 v2.4.3 // indirect
+	golang.org/x/crypto v0.45.0 // indirect
+	golang.org/x/net v0.47.0 // indirect
+	golang.org/x/sync v0.18.0 // indirect
+	golang.org/x/sys v0.38.0 // indirect
+	golang.org/x/text v0.31.0 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20251202230838-ff82c1b0f217 // indirect
+	google.golang.org/protobuf v1.36.10
+)

api/billing/fees/go.sum

@@ -0,0 +1,225 @@
+dario.cat/mergo v1.0.1 h1:Ra4+bf83h2ztPIQYNP99R6m+Y7KfnARDfID+a+vLl4s=
+dario.cat/mergo v1.0.1/go.mod h1:uNxQE+84aUszobStD9th8a29P2fMDhsBdgRYvZOxGmk=
+github.com/Azure/go-ansiterm v0.0.0-20230124172434-306776ec8161 h1:L/gRVlceqvL25UVaW/CKtUDjefjrs0SPonmDGUVOYP0=
+github.com/Azure/go-ansiterm v0.0.0-20230124172434-306776ec8161/go.mod h1:xomTg63KZ2rFqZQzSB4Vz2SUXa1BpHTVz9L5PTmPC4E=
+github.com/Microsoft/go-winio v0.6.2 h1:F2VQgta7ecxGYO8k3ZZz3RS8fVIXVxONVUPlNERoyfY=
+github.com/Microsoft/go-winio v0.6.2/go.mod h1:yd8OoFMLzJbo9gZq8j5qaps8bJ9aShtEA8Ipt1oGCvU=
+github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
+github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
+github.com/bmatcuk/doublestar/v4 v4.6.1/go.mod h1:xBQ8jztBU6kakFMg+8WGxn0c6z1fTSPVIjEY1Wr7jzc=
+github.com/bmatcuk/doublestar/v4 v4.9.1 h1:X8jg9rRZmJd4yRy7ZeNDRnM+T3ZfHv15JiBJ/avrEXE=
+github.com/bmatcuk/doublestar/v4 v4.9.1/go.mod h1:xBQ8jztBU6kakFMg+8WGxn0c6z1fTSPVIjEY1Wr7jzc=
+github.com/casbin/casbin/v2 v2.134.0 h1:wyO3hZb487GzlGVAI2hUoHQT0ehFD+9B5P+HVG9BVTM=
+github.com/casbin/casbin/v2 v2.134.0/go.mod h1:FmcfntdXLTcYXv/hxgNntcRPqAbwOG9xsism0yXT+18=
+github.com/casbin/govaluate v1.3.0/go.mod h1:G/UnbIjZk/0uMNaLwZZmFQrR72tYRZWQkO70si/iR7A=
+github.com/casbin/govaluate v1.10.0 h1:ffGw51/hYH3w3rZcxO/KcaUIDOLP84w7nsidMVgaDG0=
+github.com/casbin/govaluate v1.10.0/go.mod h1:G/UnbIjZk/0uMNaLwZZmFQrR72tYRZWQkO70si/iR7A=
+github.com/casbin/mongodb-adapter/v3 v3.7.0 h1:w9c3bea1BGK4eZTAmk17JkY52yv/xSZDSHKji8q+z6E=
+github.com/casbin/mongodb-adapter/v3 v3.7.0/go.mod h1:F1mu4ojoJVE/8VhIMxMedhjfwRDdIXgANYs6Sd0MgVA=
+github.com/cenkalti/backoff/v4 v4.3.0 h1:MyRJ/UdXutAwSAT+s3wNd7MfTIcy71VQueUuFK343L8=
+github.com/cenkalti/backoff/v4 v4.3.0/go.mod h1:Y3VNntkOUPxTVeUxJ/G5vcM//AlwfmyYozVcomhLiZE=
+github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
+github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
+github.com/containerd/log v0.1.0 h1:TCJt7ioM2cr/tfR8GPbGf9/VRAX8D2B4PjzCpfX540I=
+github.com/containerd/log v0.1.0/go.mod h1:VRRf09a7mHDIRezVKTRCrOq78v577GXq3bSa3EhrzVo=
+github.com/containerd/platforms v0.2.1 h1:zvwtM3rz2YHPQsF2CHYM8+KtB5dvhISiXh5ZpSBQv6A=
+github.com/containerd/platforms v0.2.1/go.mod h1:XHCb+2/hzowdiut9rkudds9bE5yJ7npe7dG/wG+uFPw=
+github.com/cpuguy83/dockercfg v0.3.2 h1:DlJTyZGBDlXqUZ2Dk2Q3xHs/FtnooJJVaad2S9GKorA=
+github.com/cpuguy83/dockercfg v0.3.2/go.mod h1:sugsbF4//dDlL/i+S+rtpIWp+5h0BHJHfjj5/jFyUJc=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/distribution/reference v0.6.0 h1:0IXCQ5g4/QMHHkarYzh5l+u8T3t73zM5QvfrDyIgxBk=
+github.com/distribution/reference v0.6.0/go.mod h1:BbU0aIcezP1/5jX/8MP0YiH4SdvB5Y4f/wlDRiLyi3E=
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api/billing/fees/internal/appversion/version.go

@@ -0,0 +1,28 @@
+package appversion
+
+import (
+	"github.com/tech/sendico/pkg/version"
+	vf "github.com/tech/sendico/pkg/version/factory"
+)
+
+// Build information populated at build time.
+var (
+	Version   string
+	Revision  string
+	Branch    string
+	BuildUser string
+	BuildDate string
+)
+
+// Create initialises a version.Printer with the build details for this service.
+func Create() version.Printer {
+	info := version.Info{
+		Program:   "Sendico Billing Fees Service",
+		Revision:  Revision,
+		Branch:    Branch,
+		BuildUser: BuildUser,
+		BuildDate: BuildDate,
+		Version:   Version,
+	}
+	return vf.Create(&info)
+}

api/billing/fees/internal/server/internal/serverimp.go

@@ -0,0 +1,163 @@
+package serverimp
+
+import (
+	"context"
+	"os"
+	"strings"
+	"time"
+
+	"github.com/tech/sendico/billing/fees/internal/service/fees"
+	"github.com/tech/sendico/billing/fees/storage"
+	mongostorage "github.com/tech/sendico/billing/fees/storage/mongo"
+	oracleclient "github.com/tech/sendico/fx/oracle/client"
+	"github.com/tech/sendico/pkg/api/routers"
+	"github.com/tech/sendico/pkg/db"
+	msg "github.com/tech/sendico/pkg/messaging"
+	"github.com/tech/sendico/pkg/mlogger"
+	"github.com/tech/sendico/pkg/server/grpcapp"
+	"go.uber.org/zap"
+	"gopkg.in/yaml.v3"
+)
+
+type Imp struct {
+	logger       mlogger.Logger
+	file         string
+	debug        bool
+	config       *config
+	app          *grpcapp.App[storage.Repository]
+	oracleClient oracleclient.Client
+}
+
+type config struct {
+	*grpcapp.Config `yaml:",inline"`
+	Oracle          OracleConfig `yaml:"oracle"`
+}
+
+type OracleConfig struct {
+	Address           string `yaml:"address"`
+	DialTimeoutSecs   int    `yaml:"dial_timeout_seconds"`
+	CallTimeoutSecs   int    `yaml:"call_timeout_seconds"`
+	InsecureTransport bool   `yaml:"insecure"`
+}
+
+func (c OracleConfig) dialTimeout() time.Duration {
+	if c.DialTimeoutSecs <= 0 {
+		return 5 * time.Second
+	}
+	return time.Duration(c.DialTimeoutSecs) * time.Second
+}
+
+func (c OracleConfig) callTimeout() time.Duration {
+	if c.CallTimeoutSecs <= 0 {
+		return 3 * time.Second
+	}
+	return time.Duration(c.CallTimeoutSecs) * time.Second
+}
+
+// Create initialises the billing fees server implementation.
+func Create(logger mlogger.Logger, file string, debug bool) (*Imp, error) {
+	return &Imp{
+		logger: logger.Named("server"),
+		file:   file,
+		debug:  debug,
+	}, nil
+}
+
+func (i *Imp) Shutdown() {
+	if i.app == nil {
+		if i.oracleClient != nil {
+			_ = i.oracleClient.Close()
+		}
+		return
+	}
+
+	timeout := 15 * time.Second
+	if i.config != nil && i.config.Runtime != nil {
+		timeout = i.config.Runtime.ShutdownTimeout()
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), timeout)
+	i.app.Shutdown(ctx)
+	cancel()
+
+	if i.oracleClient != nil {
+		_ = i.oracleClient.Close()
+	}
+}
+
+func (i *Imp) Start() error {
+	cfg, err := i.loadConfig()
+	if err != nil {
+		return err
+	}
+	i.config = cfg
+
+	repoFactory := func(logger mlogger.Logger, conn *db.MongoConnection) (storage.Repository, error) {
+		return mongostorage.New(logger, conn)
+	}
+
+	var oracleClient oracleclient.Client
+	if addr := strings.TrimSpace(cfg.Oracle.Address); addr != "" {
+		dialCtx, cancel := context.WithTimeout(context.Background(), cfg.Oracle.dialTimeout())
+		defer cancel()
+
+		oc, err := oracleclient.New(dialCtx, oracleclient.Config{
+			Address:     addr,
+			DialTimeout: cfg.Oracle.dialTimeout(),
+			CallTimeout: cfg.Oracle.callTimeout(),
+			Insecure:    cfg.Oracle.InsecureTransport,
+		})
+		if err != nil {
+			i.logger.Warn("failed to initialise oracle client", zap.String("address", addr), zap.Error(err))
+		} else {
+			oracleClient = oc
+			i.oracleClient = oc
+			i.logger.Info("connected to oracle service", zap.String("address", addr))
+		}
+	}
+
+	serviceFactory := func(logger mlogger.Logger, repo storage.Repository, producer msg.Producer) (grpcapp.Service, error) {
+		opts := []fees.Option{}
+		if oracleClient != nil {
+			opts = append(opts, fees.WithOracleClient(oracleClient))
+		}
+		return fees.NewService(logger, repo, producer, opts...), nil
+	}
+
+	app, err := grpcapp.NewApp(i.logger, "billing_fees", cfg.Config, i.debug, repoFactory, serviceFactory)
+	if err != nil {
+		return err
+	}
+	i.app = app
+
+	return i.app.Start()
+}
+
+func (i *Imp) loadConfig() (*config, error) {
+	data, err := os.ReadFile(i.file)
+	if err != nil {
+		i.logger.Error("Could not read configuration file", zap.String("config_file", i.file), zap.Error(err))
+		return nil, err
+	}
+
+	cfg := &config{Config: &grpcapp.Config{}}
+	if err := yaml.Unmarshal(data, cfg); err != nil {
+		i.logger.Error("Failed to parse configuration", zap.Error(err))
+		return nil, err
+	}
+
+	if cfg.Runtime == nil {
+		cfg.Runtime = &grpcapp.RuntimeConfig{ShutdownTimeoutSeconds: 15}
+	}
+
+	if cfg.GRPC == nil {
+		cfg.GRPC = &routers.GRPCConfig{
+			Network:          "tcp",
+			Address:          ":50060",
+			EnableReflection: true,
+			EnableHealth:     true,
+		}
+	}
+
+	return cfg, nil
+}

api/billing/fees/internal/server/server.go

@@ -0,0 +1,12 @@
+package server
+
+import (
+	serverimp "github.com/tech/sendico/billing/fees/internal/server/internal"
+	"github.com/tech/sendico/pkg/mlogger"
+	"github.com/tech/sendico/pkg/server"
+)
+
+// Create constructs the billing fees server implementation.
+func Create(logger mlogger.Logger, file string, debug bool) (server.Application, error) {
+	return serverimp.Create(logger, file, debug)
+}

api/billing/fees/internal/service/fees/calculator.go

@@ -0,0 +1,449 @@
+package fees
+
+import (
+	"context"
+	"errors"
+	"math/big"
+	"sort"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/tech/sendico/billing/fees/storage/model"
+	oracleclient "github.com/tech/sendico/fx/oracle/client"
+	dmath "github.com/tech/sendico/pkg/decimal"
+	"github.com/tech/sendico/pkg/merrors"
+	"github.com/tech/sendico/pkg/mlogger"
+	feesv1 "github.com/tech/sendico/pkg/proto/billing/fees/v1"
+	accountingv1 "github.com/tech/sendico/pkg/proto/common/accounting/v1"
+	fxv1 "github.com/tech/sendico/pkg/proto/common/fx/v1"
+	moneyv1 "github.com/tech/sendico/pkg/proto/common/money/v1"
+	tracev1 "github.com/tech/sendico/pkg/proto/common/trace/v1"
+	"go.uber.org/zap"
+)
+
+// Calculator isolates fee rule evaluation logic so it can be reused and tested.
+type Calculator interface {
+	Compute(ctx context.Context, plan *model.FeePlan, intent *feesv1.Intent, bookedAt time.Time, trace *tracev1.TraceContext) (*CalculationResult, error)
+}
+
+// CalculationResult contains derived fee lines and audit metadata.
+type CalculationResult struct {
+	Lines   []*feesv1.DerivedPostingLine
+	Applied []*feesv1.AppliedRule
+	FxUsed  *feesv1.FXUsed
+}
+
+// quoteCalculator is the default Calculator implementation.
+type fxOracle interface {
+	LatestRate(ctx context.Context, req oracleclient.LatestRateParams) (*oracleclient.RateSnapshot, error)
+}
+
+type quoteCalculator struct {
+	logger mlogger.Logger
+	oracle fxOracle
+}
+
+func newQuoteCalculator(logger mlogger.Logger, oracle fxOracle) Calculator {
+	return &quoteCalculator{
+		logger: logger.Named("calculator"),
+		oracle: oracle,
+	}
+}
+
+func (c *quoteCalculator) Compute(ctx context.Context, plan *model.FeePlan, intent *feesv1.Intent, bookedAt time.Time, _ *tracev1.TraceContext) (*CalculationResult, error) {
+	if plan == nil {
+		return nil, merrors.InvalidArgument("plan is required")
+	}
+	if intent == nil {
+		return nil, merrors.InvalidArgument("intent is required")
+	}
+
+	trigger := convertTrigger(intent.GetTrigger())
+	if trigger == model.TriggerUnspecified {
+		return nil, merrors.InvalidArgument("unsupported trigger")
+	}
+
+	baseAmount, err := dmath.RatFromString(intent.GetBaseAmount().GetAmount())
+	if err != nil {
+		return nil, merrors.InvalidArgument("invalid base amount")
+	}
+	if baseAmount.Sign() < 0 {
+		return nil, merrors.InvalidArgument("base amount cannot be negative")
+	}
+
+	baseScale := inferScale(intent.GetBaseAmount().GetAmount())
+
+	rules := make([]model.FeeRule, len(plan.Rules))
+	copy(rules, plan.Rules)
+	sort.SliceStable(rules, func(i, j int) bool {
+		if rules[i].Priority == rules[j].Priority {
+			return rules[i].RuleID < rules[j].RuleID
+		}
+		return rules[i].Priority < rules[j].Priority
+	})
+
+	lines := make([]*feesv1.DerivedPostingLine, 0, len(rules))
+	applied := make([]*feesv1.AppliedRule, 0, len(rules))
+
+	planID := ""
+	if planRef := plan.GetID(); planRef != nil && !planRef.IsZero() {
+		planID = planRef.Hex()
+	}
+
+	for _, rule := range rules {
+		if !shouldApplyRule(rule, trigger, intent.GetAttributes(), bookedAt) {
+			continue
+		}
+
+		ledgerAccountRef := strings.TrimSpace(rule.LedgerAccountRef)
+		if ledgerAccountRef == "" {
+			c.logger.Warn("fee rule missing ledger account reference", zap.String("rule_id", rule.RuleID))
+			continue
+		}
+
+		amount, scale, calcErr := c.calculateRuleAmount(baseAmount, baseScale, rule)
+		if calcErr != nil {
+			if !errors.Is(calcErr, merrors.ErrInvalidArg) {
+				c.logger.Warn("failed to calculate fee rule amount", zap.String("rule_id", rule.RuleID), zap.Error(calcErr))
+			}
+			continue
+		}
+		if amount.Sign() == 0 {
+			continue
+		}
+
+		currency := intent.GetBaseAmount().GetCurrency()
+		if override := strings.TrimSpace(rule.Currency); override != "" {
+			currency = override
+		}
+
+		entrySide := mapEntrySide(rule.EntrySide)
+		if entrySide == accountingv1.EntrySide_ENTRY_SIDE_UNSPECIFIED {
+			entrySide = accountingv1.EntrySide_ENTRY_SIDE_CREDIT
+		}
+
+		meta := map[string]string{
+			"fee_rule_id": rule.RuleID,
+		}
+		if planID != "" {
+			meta["fee_plan_id"] = planID
+		}
+		if rule.Metadata != nil {
+			if taxCode := strings.TrimSpace(rule.Metadata["tax_code"]); taxCode != "" {
+				meta["tax_code"] = taxCode
+			}
+			if taxRate := strings.TrimSpace(rule.Metadata["tax_rate"]); taxRate != "" {
+				meta["tax_rate"] = taxRate
+			}
+		}
+
+		lines = append(lines, &feesv1.DerivedPostingLine{
+			LedgerAccountRef: ledgerAccountRef,
+			Money: &moneyv1.Money{
+				Amount:   dmath.FormatRat(amount, scale),
+				Currency: currency,
+			},
+			LineType: mapLineType(rule.LineType),
+			Side:     entrySide,
+			Meta:     meta,
+		})
+
+		applied = append(applied, &feesv1.AppliedRule{
+			RuleId:      rule.RuleID,
+			RuleVersion: planID,
+			Formula:     rule.Formula,
+			Rounding:    mapRoundingMode(rule.Rounding),
+			TaxCode:     metadataValue(rule.Metadata, "tax_code"),
+			TaxRate:     metadataValue(rule.Metadata, "tax_rate"),
+			Parameters:  cloneStringMap(rule.Metadata),
+		})
+	}
+
+	var fxUsed *feesv1.FXUsed
+	if trigger == model.TriggerFXConversion && c.oracle != nil {
+		fxUsed = c.buildFxUsed(ctx, intent)
+	}
+
+	return &CalculationResult{
+		Lines:   lines,
+		Applied: applied,
+		FxUsed:  fxUsed,
+	}, nil
+}
+
+func (c *quoteCalculator) calculateRuleAmount(baseAmount *big.Rat, baseScale uint32, rule model.FeeRule) (*big.Rat, uint32, error) {
+	scale, err := resolveRuleScale(rule, baseScale)
+	if err != nil {
+		return nil, 0, err
+	}
+
+	result := new(big.Rat)
+
+	if percentage := strings.TrimSpace(rule.Percentage); percentage != "" {
+		percentageRat, perr := dmath.RatFromString(percentage)
+		if perr != nil {
+			return nil, 0, merrors.InvalidArgument("invalid percentage")
+		}
+		result = dmath.AddRat(result, dmath.MulRat(baseAmount, percentageRat))
+	}
+
+	if fixed := strings.TrimSpace(rule.FixedAmount); fixed != "" {
+		fixedRat, ferr := dmath.RatFromString(fixed)
+		if ferr != nil {
+			return nil, 0, merrors.InvalidArgument("invalid fixed amount")
+		}
+		result = dmath.AddRat(result, fixedRat)
+	}
+
+	if minStr := strings.TrimSpace(rule.MinimumAmount); minStr != "" {
+		minRat, merr := dmath.RatFromString(minStr)
+		if merr != nil {
+			return nil, 0, merrors.InvalidArgument("invalid minimum amount")
+		}
+		if dmath.CmpRat(result, minRat) < 0 {
+			result = new(big.Rat).Set(minRat)
+		}
+	}
+
+	if maxStr := strings.TrimSpace(rule.MaximumAmount); maxStr != "" {
+		maxRat, merr := dmath.RatFromString(maxStr)
+		if merr != nil {
+			return nil, 0, merrors.InvalidArgument("invalid maximum amount")
+		}
+		if dmath.CmpRat(result, maxRat) > 0 {
+			result = new(big.Rat).Set(maxRat)
+		}
+	}
+
+	if result.Sign() < 0 {
+		result = new(big.Rat).Abs(result)
+	}
+
+	rounded, rerr := dmath.RoundRatToScale(result, scale, toDecimalRounding(rule.Rounding))
+	if rerr != nil {
+		return nil, 0, rerr
+	}
+
+	return rounded, scale, nil
+}
+
+const (
+	attrFxBaseCurrency  = "fx_base_currency"
+	attrFxQuoteCurrency = "fx_quote_currency"
+	attrFxProvider      = "fx_provider"
+	attrFxSide          = "fx_side"
+	attrFxRateOverride  = "fx_rate"
+)
+
+func (c *quoteCalculator) buildFxUsed(ctx context.Context, intent *feesv1.Intent) *feesv1.FXUsed {
+	if intent == nil || c.oracle == nil {
+		return nil
+	}
+
+	attrs := intent.GetAttributes()
+	base := strings.TrimSpace(attrs[attrFxBaseCurrency])
+	quote := strings.TrimSpace(attrs[attrFxQuoteCurrency])
+	if base == "" || quote == "" {
+		return nil
+	}
+
+	pair := &fxv1.CurrencyPair{Base: base, Quote: quote}
+	provider := strings.TrimSpace(attrs[attrFxProvider])
+
+	snapshot, err := c.oracle.LatestRate(ctx, oracleclient.LatestRateParams{
+		Meta:     oracleclient.RequestMeta{},
+		Pair:     pair,
+		Provider: provider,
+	})
+	if err != nil {
+		c.logger.Warn("fees: failed to fetch FX context", zap.Error(err))
+		return nil
+	}
+	if snapshot == nil {
+		return nil
+	}
+
+	rateValue := strings.TrimSpace(attrs[attrFxRateOverride])
+	if rateValue == "" {
+		rateValue = snapshot.Mid
+	}
+	if rateValue == "" {
+		rateValue = snapshot.Ask
+	}
+	if rateValue == "" {
+		rateValue = snapshot.Bid
+	}
+
+	return &feesv1.FXUsed{
+		Pair:       pair,
+		Side:       parseFxSide(strings.TrimSpace(attrs[attrFxSide])),
+		Rate:       &moneyv1.Decimal{Value: rateValue},
+		AsofUnixMs: snapshot.AsOf.UnixMilli(),
+		Provider:   snapshot.Provider,
+		RateRef:    snapshot.RateRef,
+		SpreadBps:  &moneyv1.Decimal{Value: snapshot.SpreadBps},
+	}
+}
+
+func parseFxSide(value string) fxv1.Side {
+	switch strings.ToLower(value) {
+	case "buy_base", "buy_base_sell_quote", "buy":
+		return fxv1.Side_BUY_BASE_SELL_QUOTE
+	case "sell_base", "sell_base_buy_quote", "sell":
+		return fxv1.Side_SELL_BASE_BUY_QUOTE
+	default:
+		return fxv1.Side_SIDE_UNSPECIFIED
+	}
+}
+
+func inferScale(amount string) uint32 {
+	value := strings.TrimSpace(amount)
+	if value == "" {
+		return 0
+	}
+	if idx := strings.IndexAny(value, "eE"); idx >= 0 {
+		value = value[:idx]
+	}
+	if strings.HasPrefix(value, "+") || strings.HasPrefix(value, "-") {
+		value = value[1:]
+	}
+	if dot := strings.IndexByte(value, '.'); dot >= 0 {
+		return uint32(len(value[dot+1:]))
+	}
+	return 0
+}
+
+func shouldApplyRule(rule model.FeeRule, trigger model.Trigger, attributes map[string]string, bookedAt time.Time) bool {
+	if rule.Trigger != trigger {
+		return false
+	}
+	if rule.EffectiveFrom.After(bookedAt) {
+		return false
+	}
+	if rule.EffectiveTo != nil && rule.EffectiveTo.Before(bookedAt) {
+		return false
+	}
+	return ruleMatchesAttributes(rule, attributes)
+}
+
+func resolveRuleScale(rule model.FeeRule, fallback uint32) (uint32, error) {
+	if rule.Metadata != nil {
+		for _, field := range []string{"scale", "decimals", "precision"} {
+			if value, ok := rule.Metadata[field]; ok && strings.TrimSpace(value) != "" {
+				return parseScale(field, value)
+			}
+		}
+	}
+	return fallback, nil
+}
+
+func parseScale(field, value string) (uint32, error) {
+	clean := strings.TrimSpace(value)
+	if clean == "" {
+		return 0, merrors.InvalidArgument(field + " is empty")
+	}
+	parsed, err := strconv.ParseUint(clean, 10, 32)
+	if err != nil {
+		return 0, merrors.InvalidArgument("invalid " + field + " value")
+	}
+	return uint32(parsed), nil
+}
+
+func metadataValue(meta map[string]string, key string) string {
+	if meta == nil {
+		return ""
+	}
+	return strings.TrimSpace(meta[key])
+}
+
+func cloneStringMap(src map[string]string) map[string]string {
+	if len(src) == 0 {
+		return nil
+	}
+	cloned := make(map[string]string, len(src))
+	for k, v := range src {
+		cloned[k] = v
+	}
+	return cloned
+}
+
+func ruleMatchesAttributes(rule model.FeeRule, attributes map[string]string) bool {
+	if len(rule.AppliesTo) == 0 {
+		return true
+	}
+	for key, value := range rule.AppliesTo {
+		if attributes == nil {
+			return false
+		}
+		if attrValue, ok := attributes[key]; !ok || attrValue != value {
+			return false
+		}
+	}
+	return true
+}
+
+func convertTrigger(trigger feesv1.Trigger) model.Trigger {
+	switch trigger {
+	case feesv1.Trigger_TRIGGER_CAPTURE:
+		return model.TriggerCapture
+	case feesv1.Trigger_TRIGGER_REFUND:
+		return model.TriggerRefund
+	case feesv1.Trigger_TRIGGER_DISPUTE:
+		return model.TriggerDispute
+	case feesv1.Trigger_TRIGGER_PAYOUT:
+		return model.TriggerPayout
+	case feesv1.Trigger_TRIGGER_FX_CONVERSION:
+		return model.TriggerFXConversion
+	default:
+		return model.TriggerUnspecified
+	}
+}
+
+func mapLineType(lineType string) accountingv1.PostingLineType {
+	switch strings.ToLower(lineType) {
+	case "tax":
+		return accountingv1.PostingLineType_POSTING_LINE_TAX
+	case "spread":
+		return accountingv1.PostingLineType_POSTING_LINE_SPREAD
+	case "reversal":
+		return accountingv1.PostingLineType_POSTING_LINE_REVERSAL
+	default:
+		return accountingv1.PostingLineType_POSTING_LINE_FEE
+	}
+}
+
+func mapEntrySide(entrySide string) accountingv1.EntrySide {
+	switch strings.ToLower(entrySide) {
+	case "debit":
+		return accountingv1.EntrySide_ENTRY_SIDE_DEBIT
+	case "credit":
+		return accountingv1.EntrySide_ENTRY_SIDE_CREDIT
+	default:
+		return accountingv1.EntrySide_ENTRY_SIDE_UNSPECIFIED
+	}
+}
+
+func toDecimalRounding(mode string) dmath.RoundingMode {
+	switch strings.ToLower(strings.TrimSpace(mode)) {
+	case "half_up":
+		return dmath.RoundingModeHalfUp
+	case "down":
+		return dmath.RoundingModeDown
+	case "half_even", "bankers":
+		return dmath.RoundingModeHalfEven
+	default:
+		return dmath.RoundingModeHalfEven
+	}
+}
+
+func mapRoundingMode(mode string) moneyv1.RoundingMode {
+	switch strings.ToLower(mode) {
+	case "half_up":
+		return moneyv1.RoundingMode_ROUND_HALF_UP
+	case "down":
+		return moneyv1.RoundingMode_ROUND_DOWN
+	default:
+		return moneyv1.RoundingMode_ROUND_HALF_EVEN
+	}
+}

api/billing/fees/internal/service/fees/metrics.go

@@ -0,0 +1,71 @@
+package fees
+
+import (
+	"strconv"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promauto"
+	feesv1 "github.com/tech/sendico/pkg/proto/billing/fees/v1"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
+)
+
+var (
+	metricsOnce sync.Once
+
+	quoteRequestsTotal *prometheus.CounterVec
+	quoteLatency       *prometheus.HistogramVec
+)
+
+func initMetrics() {
+	metricsOnce.Do(func() {
+		quoteRequestsTotal = promauto.NewCounterVec(
+			prometheus.CounterOpts{
+				Namespace: "billing",
+				Subsystem: "fees",
+				Name:      "requests_total",
+				Help:      "Total number of fee service requests processed.",
+			},
+			[]string{"call", "trigger", "status", "fx_used"},
+		)
+
+		quoteLatency = promauto.NewHistogramVec(
+			prometheus.HistogramOpts{
+				Namespace: "billing",
+				Subsystem: "fees",
+				Name:      "request_latency_seconds",
+				Help:      "Latency of fee service requests.",
+				Buckets:   prometheus.DefBuckets,
+			},
+			[]string{"call", "trigger", "status", "fx_used"},
+		)
+	})
+}
+
+func observeMetrics(call string, trigger feesv1.Trigger, statusLabel string, fxUsed bool, took time.Duration) {
+	triggerLabel := trigger.String()
+	if trigger == feesv1.Trigger_TRIGGER_UNSPECIFIED {
+		triggerLabel = "TRIGGER_UNSPECIFIED"
+	}
+	fxLabel := strconv.FormatBool(fxUsed)
+	quoteRequestsTotal.WithLabelValues(call, triggerLabel, statusLabel, fxLabel).Inc()
+	quoteLatency.WithLabelValues(call, triggerLabel, statusLabel, fxLabel).Observe(took.Seconds())
+}
+
+func statusFromError(err error) string {
+	if err == nil {
+		return "success"
+	}
+	st, ok := status.FromError(err)
+	if !ok {
+		return "error"
+	}
+	code := st.Code()
+	if code == codes.OK {
+		return "success"
+	}
+	return strings.ToLower(code.String())
+}

api/billing/fees/internal/service/fees/options.go

@@ -0,0 +1,37 @@
+package fees
+
+import (
+	oracleclient "github.com/tech/sendico/fx/oracle/client"
+	clockpkg "github.com/tech/sendico/pkg/clock"
+)
+
+// Option configures a Service instance.
+type Option func(*Service)
+
+// WithClock sets a custom clock implementation.
+func WithClock(clock clockpkg.Clock) Option {
+	return func(s *Service) {
+		if clock != nil {
+			s.clock = clock
+		}
+	}
+}
+
+// WithCalculator sets a custom calculator implementation.
+func WithCalculator(calculator Calculator) Option {
+	return func(s *Service) {
+		if calculator != nil {
+			s.calculator = calculator
+		}
+	}
+}
+
+// WithOracleClient wires an FX oracle client for FX trigger evaluations.
+func WithOracleClient(oracle oracleclient.Client) Option {
+	return func(s *Service) {
+		s.oracle = oracle
+		if qc, ok := s.calculator.(*quoteCalculator); ok {
+			qc.oracle = oracle
+		}
+	}
+}

api/billing/fees/internal/service/fees/service.go

@@ -0,0 +1,322 @@
+package fees
+
+import (
+	"context"
+	"encoding/base64"
+	"encoding/json"
+	"errors"
+	"strings"
+	"time"
+
+	"github.com/tech/sendico/billing/fees/storage"
+	oracleclient "github.com/tech/sendico/fx/oracle/client"
+	"github.com/tech/sendico/pkg/api/routers"
+	clockpkg "github.com/tech/sendico/pkg/clock"
+	"github.com/tech/sendico/pkg/merrors"
+	msg "github.com/tech/sendico/pkg/messaging"
+	"github.com/tech/sendico/pkg/mlogger"
+	feesv1 "github.com/tech/sendico/pkg/proto/billing/fees/v1"
+	tracev1 "github.com/tech/sendico/pkg/proto/common/trace/v1"
+	"go.mongodb.org/mongo-driver/bson/primitive"
+	"go.uber.org/zap"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
+	"google.golang.org/protobuf/types/known/timestamppb"
+)
+
+type Service struct {
+	logger     mlogger.Logger
+	storage    storage.Repository
+	producer   msg.Producer
+	clock      clockpkg.Clock
+	calculator Calculator
+	oracle     oracleclient.Client
+	feesv1.UnimplementedFeeEngineServer
+}
+
+func NewService(logger mlogger.Logger, repo storage.Repository, producer msg.Producer, opts ...Option) *Service {
+	svc := &Service{
+		logger:   logger.Named("fees"),
+		storage:  repo,
+		producer: producer,
+		clock:    clockpkg.NewSystem(),
+	}
+	initMetrics()
+
+	for _, opt := range opts {
+		opt(svc)
+	}
+
+	if svc.clock == nil {
+		svc.clock = clockpkg.NewSystem()
+	}
+	if svc.calculator == nil {
+		svc.calculator = newQuoteCalculator(svc.logger, svc.oracle)
+	}
+
+	return svc
+}
+
+func (s *Service) Register(router routers.GRPC) error {
+	return router.Register(func(reg grpc.ServiceRegistrar) {
+		feesv1.RegisterFeeEngineServer(reg, s)
+	})
+}
+
+func (s *Service) QuoteFees(ctx context.Context, req *feesv1.QuoteFeesRequest) (resp *feesv1.QuoteFeesResponse, err error) {
+	start := s.clock.Now()
+	trigger := feesv1.Trigger_TRIGGER_UNSPECIFIED
+	if req != nil && req.GetIntent() != nil {
+		trigger = req.GetIntent().GetTrigger()
+	}
+	var fxUsed bool
+	defer func() {
+		statusLabel := statusFromError(err)
+		if err == nil && resp != nil {
+			fxUsed = resp.GetFxUsed() != nil
+		}
+		observeMetrics("quote", trigger, statusLabel, fxUsed, time.Since(start))
+	}()
+
+	if err = s.validateQuoteRequest(req); err != nil {
+		return nil, err
+	}
+
+	orgRef, parseErr := primitive.ObjectIDFromHex(req.GetMeta().GetOrganizationRef())
+	if parseErr != nil {
+		err = status.Error(codes.InvalidArgument, "invalid organization_ref")
+		return nil, err
+	}
+
+	lines, applied, fx, computeErr := s.computeQuote(ctx, orgRef, req.GetIntent(), req.GetPolicy(), req.GetMeta().GetTrace())
+	if computeErr != nil {
+		err = computeErr
+		return nil, err
+	}
+
+	resp = &feesv1.QuoteFeesResponse{
+		Meta:    &feesv1.ResponseMeta{Trace: req.GetMeta().GetTrace()},
+		Lines:   lines,
+		Applied: applied,
+		FxUsed:  fx,
+	}
+	return resp, nil
+}
+
+func (s *Service) PrecomputeFees(ctx context.Context, req *feesv1.PrecomputeFeesRequest) (resp *feesv1.PrecomputeFeesResponse, err error) {
+	start := s.clock.Now()
+	trigger := feesv1.Trigger_TRIGGER_UNSPECIFIED
+	if req != nil && req.GetIntent() != nil {
+		trigger = req.GetIntent().GetTrigger()
+	}
+	var fxUsed bool
+	defer func() {
+		statusLabel := statusFromError(err)
+		if err == nil && resp != nil {
+			fxUsed = resp.GetFxUsed() != nil
+		}
+		observeMetrics("precompute", trigger, statusLabel, fxUsed, time.Since(start))
+	}()
+
+	if err = s.validatePrecomputeRequest(req); err != nil {
+		return nil, err
+	}
+
+	now := s.clock.Now()
+
+	orgRef, parseErr := primitive.ObjectIDFromHex(req.GetMeta().GetOrganizationRef())
+	if parseErr != nil {
+		err = status.Error(codes.InvalidArgument, "invalid organization_ref")
+		return nil, err
+	}
+
+	lines, applied, fx, computeErr := s.computeQuoteWithTime(ctx, orgRef, req.GetIntent(), nil, req.GetMeta().GetTrace(), now)
+	if computeErr != nil {
+		err = computeErr
+		return nil, err
+	}
+
+	ttl := req.GetTtlMs()
+	if ttl <= 0 {
+		ttl = 60000
+	}
+	expiresAt := now.Add(time.Duration(ttl) * time.Millisecond)
+
+	payload := feeQuoteTokenPayload{
+		OrganizationRef: req.GetMeta().GetOrganizationRef(),
+		Intent:          req.GetIntent(),
+		ExpiresAtUnixMs: expiresAt.UnixMilli(),
+		Trace:           req.GetMeta().GetTrace(),
+	}
+
+	var token string
+	if token, err = encodeTokenPayload(payload); err != nil {
+		s.logger.Warn("failed to encode fee quote token", zap.Error(err))
+		err = status.Error(codes.Internal, "failed to encode fee quote token")
+		return nil, err
+	}
+
+	resp = &feesv1.PrecomputeFeesResponse{
+		Meta:          &feesv1.ResponseMeta{Trace: req.GetMeta().GetTrace()},
+		FeeQuoteToken: token,
+		ExpiresAt:     timestamppb.New(expiresAt),
+		Lines:         lines,
+		Applied:       applied,
+		FxUsed:        fx,
+	}
+	return resp, nil
+}
+
+func (s *Service) ValidateFeeToken(ctx context.Context, req *feesv1.ValidateFeeTokenRequest) (resp *feesv1.ValidateFeeTokenResponse, err error) {
+	start := s.clock.Now()
+	trigger := feesv1.Trigger_TRIGGER_UNSPECIFIED
+	var fxUsed bool
+	defer func() {
+		statusLabel := statusFromError(err)
+		if err == nil && resp != nil {
+			if !resp.GetValid() {
+				statusLabel = "invalid"
+			}
+			fxUsed = resp.GetFxUsed() != nil
+			if resp.GetIntent() != nil {
+				trigger = resp.GetIntent().GetTrigger()
+			}
+		}
+		observeMetrics("validate", trigger, statusLabel, fxUsed, time.Since(start))
+	}()
+
+	if req == nil || strings.TrimSpace(req.GetFeeQuoteToken()) == "" {
+		err = status.Error(codes.InvalidArgument, "fee_quote_token is required")
+		return nil, err
+	}
+
+	now := s.clock.Now()
+
+	payload, decodeErr := decodeTokenPayload(req.GetFeeQuoteToken())
+	if decodeErr != nil {
+		s.logger.Warn("failed to decode fee quote token", zap.Error(decodeErr))
+		resp = &feesv1.ValidateFeeTokenResponse{Meta: &feesv1.ResponseMeta{}, Valid: false, Reason: "invalid_token"}
+		return resp, nil
+	}
+
+	trigger = payload.Intent.GetTrigger()
+
+	if now.UnixMilli() > payload.ExpiresAtUnixMs {
+		resp = &feesv1.ValidateFeeTokenResponse{Meta: &feesv1.ResponseMeta{}, Valid: false, Reason: "expired"}
+		return resp, nil
+	}
+
+	orgRef, parseErr := primitive.ObjectIDFromHex(payload.OrganizationRef)
+	if parseErr != nil {
+		s.logger.Warn("token contained invalid organization reference", zap.Error(parseErr))
+		resp = &feesv1.ValidateFeeTokenResponse{Meta: &feesv1.ResponseMeta{}, Valid: false, Reason: "invalid_token"}
+		return resp, nil
+	}
+
+	lines, applied, fx, computeErr := s.computeQuoteWithTime(ctx, orgRef, payload.Intent, nil, payload.Trace, now)
+	if computeErr != nil {
+		err = computeErr
+		return nil, err
+	}
+
+	resp = &feesv1.ValidateFeeTokenResponse{
+		Meta:    &feesv1.ResponseMeta{Trace: payload.Trace},
+		Valid:   true,
+		Intent:  payload.Intent,
+		Lines:   lines,
+		Applied: applied,
+		FxUsed:  fx,
+	}
+	return resp, nil
+}
+
+func (s *Service) validateQuoteRequest(req *feesv1.QuoteFeesRequest) error {
+	if req == nil {
+		return status.Error(codes.InvalidArgument, "request is required")
+	}
+	if req.GetMeta() == nil || strings.TrimSpace(req.GetMeta().GetOrganizationRef()) == "" {
+		return status.Error(codes.InvalidArgument, "meta.organization_ref is required")
+	}
+	if req.GetIntent() == nil {
+		return status.Error(codes.InvalidArgument, "intent is required")
+	}
+	if req.GetIntent().GetTrigger() == feesv1.Trigger_TRIGGER_UNSPECIFIED {
+		return status.Error(codes.InvalidArgument, "intent.trigger is required")
+	}
+	if req.GetIntent().GetBaseAmount() == nil {
+		return status.Error(codes.InvalidArgument, "intent.base_amount is required")
+	}
+	if strings.TrimSpace(req.GetIntent().GetBaseAmount().GetAmount()) == "" {
+		return status.Error(codes.InvalidArgument, "intent.base_amount.amount is required")
+	}
+	if strings.TrimSpace(req.GetIntent().GetBaseAmount().GetCurrency()) == "" {
+		return status.Error(codes.InvalidArgument, "intent.base_amount.currency is required")
+	}
+	return nil
+}
+
+func (s *Service) validatePrecomputeRequest(req *feesv1.PrecomputeFeesRequest) error {
+	if req == nil {
+		return status.Error(codes.InvalidArgument, "request is required")
+	}
+	return s.validateQuoteRequest(&feesv1.QuoteFeesRequest{Meta: req.GetMeta(), Intent: req.GetIntent()})
+}
+
+func (s *Service) computeQuote(ctx context.Context, orgRef primitive.ObjectID, intent *feesv1.Intent, overrides *feesv1.PolicyOverrides, trace *tracev1.TraceContext) ([]*feesv1.DerivedPostingLine, []*feesv1.AppliedRule, *feesv1.FXUsed, error) {
+	return s.computeQuoteWithTime(ctx, orgRef, intent, overrides, trace, s.clock.Now())
+}
+
+func (s *Service) computeQuoteWithTime(ctx context.Context, orgRef primitive.ObjectID, intent *feesv1.Intent, overrides *feesv1.PolicyOverrides, trace *tracev1.TraceContext, now time.Time) ([]*feesv1.DerivedPostingLine, []*feesv1.AppliedRule, *feesv1.FXUsed, error) {
+	bookedAt := now
+	if intent.GetBookedAt() != nil && intent.GetBookedAt().IsValid() {
+		bookedAt = intent.GetBookedAt().AsTime()
+	}
+
+	plan, err := s.storage.Plans().GetActivePlan(ctx, orgRef, bookedAt)
+	if err != nil {
+		if errors.Is(err, storage.ErrFeePlanNotFound) {
+			return nil, nil, nil, status.Error(codes.NotFound, "fee plan not found")
+		}
+		s.logger.Warn("failed to load active fee plan", zap.Error(err))
+		return nil, nil, nil, status.Error(codes.Internal, "failed to load fee plan")
+	}
+
+	result, calcErr := s.calculator.Compute(ctx, plan, intent, bookedAt, trace)
+	if calcErr != nil {
+		if errors.Is(calcErr, merrors.ErrInvalidArg) {
+			return nil, nil, nil, status.Error(codes.InvalidArgument, calcErr.Error())
+		}
+		s.logger.Warn("failed to compute fee quote", zap.Error(calcErr))
+		return nil, nil, nil, status.Error(codes.Internal, "failed to compute fee quote")
+	}
+
+	return result.Lines, result.Applied, result.FxUsed, nil
+}
+
+type feeQuoteTokenPayload struct {
+	OrganizationRef string                `json:"organization_ref"`
+	Intent          *feesv1.Intent        `json:"intent"`
+	ExpiresAtUnixMs int64                 `json:"expires_at_unix_ms"`
+	Trace           *tracev1.TraceContext `json:"trace,omitempty"`
+}
+
+func encodeTokenPayload(payload feeQuoteTokenPayload) (string, error) {
+	data, err := json.Marshal(payload)
+	if err != nil {
+		return "", merrors.Internal("fees: failed to serialize token payload")
+	}
+	return base64.StdEncoding.EncodeToString(data), nil
+}
+
+func decodeTokenPayload(token string) (feeQuoteTokenPayload, error) {
+	var payload feeQuoteTokenPayload
+	data, err := base64.StdEncoding.DecodeString(token)
+	if err != nil {
+		return payload, merrors.InvalidArgument("fees: invalid token encoding")
+	}
+	if err := json.Unmarshal(data, &payload); err != nil {
+		return payload, merrors.InvalidArgument("fees: invalid token payload")
+	}
+	return payload, nil
+}

api/billing/fees/internal/service/fees/service_test.go

@@ -0,0 +1,476 @@
+package fees
+
+import (
+	"context"
+	"testing"
+	"time"
+
+	"github.com/tech/sendico/billing/fees/storage"
+	"github.com/tech/sendico/billing/fees/storage/model"
+	oracleclient "github.com/tech/sendico/fx/oracle/client"
+	me "github.com/tech/sendico/pkg/messaging/envelope"
+	feesv1 "github.com/tech/sendico/pkg/proto/billing/fees/v1"
+	moneyv1 "github.com/tech/sendico/pkg/proto/common/money/v1"
+	tracev1 "github.com/tech/sendico/pkg/proto/common/trace/v1"
+	"go.mongodb.org/mongo-driver/bson/primitive"
+	"go.uber.org/zap"
+	"google.golang.org/protobuf/types/known/timestamppb"
+)
+
+func TestQuoteFees_ComputesDerivedLines(t *testing.T) {
+	t.Helper()
+
+	now := time.Date(2024, 1, 10, 16, 0, 0, 0, time.UTC)
+	orgRef := primitive.NewObjectID()
+
+	plan := &model.FeePlan{
+		Active:        true,
+		EffectiveFrom: now.Add(-time.Hour),
+		Rules: []model.FeeRule{
+			{
+				RuleID:           "capture_default",
+				Trigger:          model.TriggerCapture,
+				Priority:         10,
+				Percentage:       "0.029",
+				FixedAmount:      "0.30",
+				LedgerAccountRef: "acct:fees",
+				LineType:         "fee",
+				EntrySide:        "credit",
+				Rounding:         "half_up",
+				Metadata: map[string]string{
+					"scale":    "2",
+					"tax_code": "VAT",
+					"tax_rate": "0.20",
+				},
+				EffectiveFrom: now.Add(-time.Hour),
+			},
+		},
+	}
+	plan.SetID(primitive.NewObjectID())
+	plan.SetOrganizationRef(orgRef)
+
+	service := NewService(
+		zap.NewNop(),
+		&stubRepository{plans: &stubPlansStore{plan: plan}},
+		noopProducer{},
+		WithClock(fixedClock{now: now}),
+	)
+
+	req := &feesv1.QuoteFeesRequest{
+		Meta: &feesv1.RequestMeta{
+			OrganizationRef: orgRef.Hex(),
+			Trace: &tracev1.TraceContext{
+				TraceRef: "trace-capture",
+			},
+		},
+		Intent: &feesv1.Intent{
+			Trigger: feesv1.Trigger_TRIGGER_CAPTURE,
+			BaseAmount: &moneyv1.Money{
+				Amount:   "100.00",
+				Currency: "USD",
+			},
+			BookedAt:   timestamppb.New(now),
+			Attributes: map[string]string{"channel": "card"},
+		},
+	}
+
+	resp, err := service.QuoteFees(context.Background(), req)
+	if err != nil {
+		t.Fatalf("QuoteFees returned error: %v", err)
+	}
+
+	if resp.GetMeta().GetTrace().GetTraceRef() != "trace-capture" {
+		t.Fatalf("expected trace_ref to round-trip, got %q", resp.GetMeta().GetTrace().GetTraceRef())
+	}
+
+	if len(resp.GetLines()) != 1 {
+		t.Fatalf("expected 1 derived line, got %d", len(resp.GetLines()))
+	}
+
+	line := resp.GetLines()[0]
+	if got := line.GetMoney().GetAmount(); got != "3.20" {
+		t.Fatalf("expected fee amount 3.20, got %s", got)
+	}
+	if line.GetMoney().GetCurrency() != "USD" {
+		t.Fatalf("expected currency USD, got %s", line.GetMoney().GetCurrency())
+	}
+	if line.GetLedgerAccountRef() != "acct:fees" {
+		t.Fatalf("unexpected ledger account ref %s", line.GetLedgerAccountRef())
+	}
+	if meta := line.GetMeta(); meta["fee_rule_id"] != "capture_default" || meta["fee_plan_id"] != plan.GetID().Hex() || meta["tax_code"] != "VAT" {
+		t.Fatalf("unexpected derived line metadata: %#v", meta)
+	}
+
+	if len(resp.GetApplied()) != 1 {
+		t.Fatalf("expected 1 applied rule, got %d", len(resp.GetApplied()))
+	}
+
+	applied := resp.GetApplied()[0]
+	if applied.GetTaxCode() != "VAT" || applied.GetTaxRate() != "0.20" {
+		t.Fatalf("applied rule metadata mismatch: %+v", applied)
+	}
+	if applied.GetRounding() != moneyv1.RoundingMode_ROUND_HALF_UP {
+		t.Fatalf("expected rounding HALF_UP, got %v", applied.GetRounding())
+	}
+	if applied.GetParameters()["scale"] != "2" {
+		t.Fatalf("expected parameters to carry metadata scale, got %+v", applied.GetParameters())
+	}
+}
+
+func TestQuoteFees_FiltersByAttributesAndDates(t *testing.T) {
+	t.Helper()
+
+	now := time.Date(2024, 5, 20, 9, 30, 0, 0, time.UTC)
+	orgRef := primitive.NewObjectID()
+
+	plan := &model.FeePlan{
+		Active:        true,
+		EffectiveFrom: now.Add(-24 * time.Hour),
+		Rules: []model.FeeRule{
+			{
+				RuleID:           "base",
+				Trigger:          model.TriggerCapture,
+				Priority:         1,
+				Percentage:       "0.10",
+				LedgerAccountRef: "acct:base",
+				Metadata:         map[string]string{"scale": "2"},
+				Rounding:         "half_even",
+				EffectiveFrom:    now.Add(-time.Hour),
+			},
+			{
+				RuleID:           "future",
+				Trigger:          model.TriggerCapture,
+				Priority:         2,
+				Percentage:       "0.50",
+				LedgerAccountRef: "acct:future",
+				Metadata:         map[string]string{"scale": "2"},
+				Rounding:         "half_even",
+				EffectiveFrom:    now.Add(time.Hour),
+			},
+			{
+				RuleID:           "attr",
+				Trigger:          model.TriggerCapture,
+				Priority:         3,
+				Percentage:       "0.30",
+				LedgerAccountRef: "acct:attr",
+				Metadata:         map[string]string{"scale": "2"},
+				AppliesTo:        map[string]string{"region": "eu"},
+				Rounding:         "half_even",
+				EffectiveFrom:    now.Add(-time.Hour),
+			},
+		},
+	}
+	plan.SetID(primitive.NewObjectID())
+	plan.SetOrganizationRef(orgRef)
+
+	service := NewService(
+		zap.NewNop(),
+		&stubRepository{plans: &stubPlansStore{plan: plan}},
+		noopProducer{},
+		WithClock(fixedClock{now: now}),
+	)
+
+	req := &feesv1.QuoteFeesRequest{
+		Meta: &feesv1.RequestMeta{OrganizationRef: orgRef.Hex()},
+		Intent: &feesv1.Intent{
+			Trigger: feesv1.Trigger_TRIGGER_CAPTURE,
+			BaseAmount: &moneyv1.Money{
+				Amount:   "50.00",
+				Currency: "EUR",
+			},
+			BookedAt:   timestamppb.New(now),
+			Attributes: map[string]string{"region": "us"},
+		},
+	}
+
+	resp, err := service.QuoteFees(context.Background(), req)
+	if err != nil {
+		t.Fatalf("QuoteFees returned error: %v", err)
+	}
+	if len(resp.GetLines()) != 1 {
+		t.Fatalf("expected only base rule to fire, got %d lines", len(resp.GetLines()))
+	}
+	line := resp.GetLines()[0]
+	if line.GetLedgerAccountRef() != "acct:base" {
+		t.Fatalf("expected base rule to apply, got %s", line.GetLedgerAccountRef())
+	}
+	if line.GetMoney().GetAmount() != "5.00" {
+		t.Fatalf("expected 5.00 amount, got %s", line.GetMoney().GetAmount())
+	}
+}
+
+func TestQuoteFees_RoundingDown(t *testing.T) {
+	t.Helper()
+
+	now := time.Date(2024, 3, 15, 12, 0, 0, 0, time.UTC)
+	orgRef := primitive.NewObjectID()
+
+	plan := &model.FeePlan{
+		Active:        true,
+		EffectiveFrom: now.Add(-time.Hour),
+		Rules: []model.FeeRule{
+			{
+				RuleID:           "round_down",
+				Trigger:          model.TriggerCapture,
+				Priority:         1,
+				FixedAmount:      "0.015",
+				LedgerAccountRef: "acct:round",
+				Metadata:         map[string]string{"scale": "2"},
+				Rounding:         "down",
+				EffectiveFrom:    now.Add(-time.Hour),
+			},
+		},
+	}
+	plan.SetID(primitive.NewObjectID())
+	plan.SetOrganizationRef(orgRef)
+
+	service := NewService(
+		zap.NewNop(),
+		&stubRepository{plans: &stubPlansStore{plan: plan}},
+		noopProducer{},
+		WithClock(fixedClock{now: now}),
+	)
+
+	req := &feesv1.QuoteFeesRequest{
+		Meta: &feesv1.RequestMeta{OrganizationRef: orgRef.Hex()},
+		Intent: &feesv1.Intent{
+			Trigger: feesv1.Trigger_TRIGGER_CAPTURE,
+			BaseAmount: &moneyv1.Money{
+				Amount:   "1.00",
+				Currency: "USD",
+			},
+			BookedAt: timestamppb.New(now),
+		},
+	}
+
+	resp, err := service.QuoteFees(context.Background(), req)
+	if err != nil {
+		t.Fatalf("QuoteFees returned error: %v", err)
+	}
+	if len(resp.GetLines()) != 1 {
+		t.Fatalf("expected single derived line, got %d", len(resp.GetLines()))
+	}
+	if resp.GetLines()[0].GetMoney().GetAmount() != "0.01" {
+		t.Fatalf("expected rounding down to 0.01, got %s", resp.GetLines()[0].GetMoney().GetAmount())
+	}
+}
+
+func TestQuoteFees_UsesInjectedCalculator(t *testing.T) {
+	t.Helper()
+
+	now := time.Date(2024, 6, 1, 8, 0, 0, 0, time.UTC)
+	orgRef := primitive.NewObjectID()
+	plan := &model.FeePlan{
+		Active:        true,
+		EffectiveFrom: now.Add(-time.Hour),
+	}
+	plan.SetID(primitive.NewObjectID())
+	plan.SetOrganizationRef(orgRef)
+
+	result := &CalculationResult{
+		Lines: []*feesv1.DerivedPostingLine{
+			{
+				LedgerAccountRef: "acct:stub",
+				Money: &moneyv1.Money{
+					Amount:   "1.23",
+					Currency: "USD",
+				},
+			},
+		},
+		Applied: []*feesv1.AppliedRule{
+			{RuleId: "stub"},
+		},
+	}
+	calc := &stubCalculator{result: result}
+
+	service := NewService(
+		zap.NewNop(),
+		&stubRepository{plans: &stubPlansStore{plan: plan}},
+		noopProducer{},
+		WithClock(fixedClock{now: now}),
+		WithCalculator(calc),
+	)
+
+	resp, err := service.QuoteFees(context.Background(), &feesv1.QuoteFeesRequest{
+		Meta: &feesv1.RequestMeta{OrganizationRef: orgRef.Hex()},
+		Intent: &feesv1.Intent{
+			Trigger: feesv1.Trigger_TRIGGER_CAPTURE,
+			BaseAmount: &moneyv1.Money{
+				Amount:   "10.00",
+				Currency: "USD",
+			},
+		},
+	})
+	if err != nil {
+		t.Fatalf("QuoteFees returned error: %v", err)
+	}
+	if !calc.called {
+		t.Fatalf("expected calculator to be invoked")
+	}
+	if calc.gotPlan != plan {
+		t.Fatalf("expected calculator to receive plan pointer")
+	}
+	if len(resp.GetLines()) != len(result.Lines) {
+		t.Fatalf("expected %d lines, got %d", len(result.Lines), len(resp.GetLines()))
+	}
+	if resp.GetLines()[0].GetLedgerAccountRef() != "acct:stub" {
+		t.Fatalf("unexpected ledger account in response: %s", resp.GetLines()[0].GetLedgerAccountRef())
+	}
+}
+
+func TestQuoteFees_PopulatesFxUsed(t *testing.T) {
+	t.Helper()
+
+	now := time.Date(2024, 7, 1, 9, 30, 0, 0, time.UTC)
+	orgRef := primitive.NewObjectID()
+
+	plan := &model.FeePlan{
+		Active:        true,
+		EffectiveFrom: now.Add(-time.Hour),
+		Rules: []model.FeeRule{
+			{
+				RuleID:           "fx_mark_up",
+				Trigger:          model.TriggerFXConversion,
+				Priority:         1,
+				Percentage:       "0.03",
+				LedgerAccountRef: "acct:fx",
+				Metadata:         map[string]string{"scale": "2"},
+				Rounding:         "half_even",
+				EffectiveFrom:    now.Add(-time.Hour),
+			},
+		},
+	}
+	plan.SetID(primitive.NewObjectID())
+	plan.SetOrganizationRef(orgRef)
+
+	fakeOracle := &oracleclient.Fake{
+		LatestRateFn: func(ctx context.Context, req oracleclient.LatestRateParams) (*oracleclient.RateSnapshot, error) {
+			return &oracleclient.RateSnapshot{
+				Pair:      req.Pair,
+				Mid:       "1.2300",
+				SpreadBps: "12",
+				Provider:  "TestProvider",
+				RateRef:   "rate-ref-123",
+				AsOf:      now.Add(-2 * time.Minute),
+			}, nil
+		},
+	}
+
+	service := NewService(
+		zap.NewNop(),
+		&stubRepository{plans: &stubPlansStore{plan: plan}},
+		noopProducer{},
+		WithClock(fixedClock{now: now}),
+		WithOracleClient(fakeOracle),
+	)
+
+	resp, err := service.QuoteFees(context.Background(), &feesv1.QuoteFeesRequest{
+		Meta: &feesv1.RequestMeta{OrganizationRef: orgRef.Hex()},
+		Intent: &feesv1.Intent{
+			Trigger: feesv1.Trigger_TRIGGER_FX_CONVERSION,
+			BaseAmount: &moneyv1.Money{
+				Amount:   "100.00",
+				Currency: "USD",
+			},
+			Attributes: map[string]string{
+				"fx_base_currency":  "USD",
+				"fx_quote_currency": "EUR",
+				"fx_provider":       "TestProvider",
+				"fx_side":           "buy_base",
+			},
+		},
+	})
+	if err != nil {
+		t.Fatalf("QuoteFees returned error: %v", err)
+	}
+
+	if resp.GetFxUsed() == nil {
+		t.Fatalf("expected FxUsed to be populated")
+	}
+	fx := resp.GetFxUsed()
+	if fx.GetProvider() != "TestProvider" || fx.GetRate().GetValue() != "1.2300" {
+		t.Fatalf("unexpected FxUsed payload: %+v", fx)
+	}
+	if fx.GetPair().GetBase() != "USD" || fx.GetPair().GetQuote() != "EUR" {
+		t.Fatalf("unexpected currency pair: %+v", fx.GetPair())
+	}
+}
+
+type stubRepository struct {
+	plans storage.PlansStore
+}
+
+func (s *stubRepository) Ping(context.Context) error {
+	return nil
+}
+
+func (s *stubRepository) Plans() storage.PlansStore {
+	return s.plans
+}
+
+type stubPlansStore struct {
+	plan *model.FeePlan
+}
+
+func (s *stubPlansStore) Create(context.Context, *model.FeePlan) error {
+	return nil
+}
+
+func (s *stubPlansStore) Update(context.Context, *model.FeePlan) error {
+	return nil
+}
+
+func (s *stubPlansStore) Get(context.Context, primitive.ObjectID) (*model.FeePlan, error) {
+	return nil, storage.ErrFeePlanNotFound
+}
+
+func (s *stubPlansStore) GetActivePlan(_ context.Context, orgRef primitive.ObjectID, at time.Time) (*model.FeePlan, error) {
+	if s.plan == nil {
+		return nil, storage.ErrFeePlanNotFound
+	}
+	if s.plan.GetOrganizationRef() != orgRef {
+		return nil, storage.ErrFeePlanNotFound
+	}
+	if !s.plan.Active {
+		return nil, storage.ErrFeePlanNotFound
+	}
+	if !s.plan.EffectiveFrom.Before(at) && !s.plan.EffectiveFrom.Equal(at) {
+		return nil, storage.ErrFeePlanNotFound
+	}
+	if s.plan.EffectiveTo != nil && s.plan.EffectiveTo.Before(at) {
+		return nil, storage.ErrFeePlanNotFound
+	}
+	return s.plan, nil
+}
+
+type noopProducer struct{}
+
+func (noopProducer) SendMessage(me.Envelope) error {
+	return nil
+}
+
+type fixedClock struct {
+	now time.Time
+}
+
+func (f fixedClock) Now() time.Time {
+	return f.now
+}
+
+type stubCalculator struct {
+	result   *CalculationResult
+	err      error
+	called   bool
+	gotPlan  *model.FeePlan
+	bookedAt time.Time
+}
+
+func (s *stubCalculator) Compute(_ context.Context, plan *model.FeePlan, _ *feesv1.Intent, bookedAt time.Time, _ *tracev1.TraceContext) (*CalculationResult, error) {
+	s.called = true
+	s.gotPlan = plan
+	s.bookedAt = bookedAt
+	if s.err != nil {
+		return nil, s.err
+	}
+	return s.result, nil
+}

api/billing/fees/main.go

@@ -0,0 +1,17 @@
+package main
+
+import (
+	"github.com/tech/sendico/billing/fees/internal/appversion"
+	si "github.com/tech/sendico/billing/fees/internal/server"
+	"github.com/tech/sendico/pkg/mlogger"
+	"github.com/tech/sendico/pkg/server"
+	smain "github.com/tech/sendico/pkg/server/main"
+)
+
+func factory(logger mlogger.Logger, file string, debug bool) (server.Application, error) {
+	return si.Create(logger, file, debug)
+}
+
+func main() {
+	smain.RunServer("main", appversion.Create(), factory)
+}

api/billing/fees/storage/model/plan.go

@@ -0,0 +1,62 @@
+package model
+
+import (
+	"time"
+
+	"github.com/tech/sendico/pkg/db/storable"
+	"github.com/tech/sendico/pkg/model"
+)
+
+const (
+	FeePlansCollection = "fee_plans"
+)
+
+// Trigger represents the event that causes a fee rule to apply.
+type Trigger string
+
+const (
+	TriggerUnspecified  Trigger = "unspecified"
+	TriggerCapture      Trigger = "capture"
+	TriggerRefund       Trigger = "refund"
+	TriggerDispute      Trigger = "dispute"
+	TriggerPayout       Trigger = "payout"
+	TriggerFXConversion Trigger = "fx_conversion"
+)
+
+// FeePlan describes a collection of fee rules for an organisation.
+type FeePlan struct {
+	storable.Base               `bson:",inline" json:",inline"`
+	model.OrganizationBoundBase `bson:",inline" json:",inline"`
+	model.Describable           `bson:",inline" json:",inline"`
+	Active                      bool              `bson:"active"             json:"active"`
+	EffectiveFrom               time.Time         `bson:"effectiveFrom"      json:"effectiveFrom"`
+	EffectiveTo                 *time.Time        `bson:"effectiveTo,omitempty" json:"effectiveTo,omitempty"`
+	Rules                       []FeeRule         `bson:"rules,omitempty"    json:"rules,omitempty"`
+	Metadata                    map[string]string `bson:"metadata,omitempty" json:"metadata,omitempty"`
+}
+
+// Collection implements storable.Storable.
+func (*FeePlan) Collection() string {
+	return FeePlansCollection
+}
+
+// FeeRule represents a single pricing rule within a plan.
+type FeeRule struct {
+	RuleID        string            `bson:"ruleId"                  json:"ruleId"`
+	Trigger       Trigger           `bson:"trigger"                 json:"trigger"`
+	Priority      int               `bson:"priority"                json:"priority"`
+	Percentage    string            `bson:"percentage,omitempty"    json:"percentage,omitempty"`
+	FixedAmount   string            `bson:"fixedAmount,omitempty"   json:"fixedAmount,omitempty"`
+	Currency      string            `bson:"currency,omitempty"      json:"currency,omitempty"`
+	MinimumAmount string            `bson:"minimumAmount,omitempty" json:"minimumAmount,omitempty"`
+	MaximumAmount string            `bson:"maximumAmount,omitempty" json:"maximumAmount,omitempty"`
+	AppliesTo     map[string]string `bson:"appliesTo,omitempty"     json:"appliesTo,omitempty"`
+	Formula       string            `bson:"formula,omitempty"       json:"formula,omitempty"`
+	Metadata      map[string]string `bson:"metadata,omitempty"      json:"metadata,omitempty"`
+	LedgerAccountRef string         `bson:"ledgerAccountRef,omitempty" json:"ledgerAccountRef,omitempty"`
+	LineType         string         `bson:"lineType,omitempty"        json:"lineType,omitempty"`
+	EntrySide        string         `bson:"entrySide,omitempty"       json:"entrySide,omitempty"`
+	Rounding         string         `bson:"rounding,omitempty"        json:"rounding,omitempty"`
+	EffectiveFrom time.Time         `bson:"effectiveFrom"           json:"effectiveFrom"`
+	EffectiveTo   *time.Time        `bson:"effectiveTo,omitempty"   json:"effectiveTo,omitempty"`
+}

api/billing/fees/storage/mongo/repository.go

@@ -0,0 +1,69 @@
+package mongo
+
+import (
+	"context"
+	"time"
+
+	"github.com/tech/sendico/billing/fees/storage"
+	"github.com/tech/sendico/billing/fees/storage/mongo/store"
+	"github.com/tech/sendico/pkg/db"
+	"github.com/tech/sendico/pkg/merrors"
+	"github.com/tech/sendico/pkg/mlogger"
+	"go.mongodb.org/mongo-driver/mongo"
+	"go.uber.org/zap"
+)
+
+type Store struct {
+	logger mlogger.Logger
+	conn   *db.MongoConnection
+	db     *mongo.Database
+
+	plans storage.PlansStore
+}
+
+// New creates a repository backed by MongoDB for the billing fees service.
+func New(logger mlogger.Logger, conn *db.MongoConnection) (*Store, error) {
+	if conn == nil {
+		return nil, merrors.InvalidArgument("mongo connection is nil")
+	}
+
+	client := conn.Client()
+	if client == nil {
+		return nil, merrors.Internal("mongo client not initialised")
+	}
+
+	database := conn.Database()
+	result := &Store{
+		logger: logger.Named("storage").Named("mongo"),
+		conn:   conn,
+		db:     database,
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+
+	if err := result.Ping(ctx); err != nil {
+		result.logger.Error("mongo ping failed during store init", zap.Error(err))
+		return nil, err
+	}
+
+	plansStore, err := store.NewPlans(result.logger, database)
+	if err != nil {
+		result.logger.Error("failed to initialise plans store", zap.Error(err))
+		return nil, err
+	}
+	result.plans = plansStore
+
+	result.logger.Info("Billing fees MongoDB storage initialised")
+	return result, nil
+}
+
+func (s *Store) Ping(ctx context.Context) error {
+	return s.conn.Ping(ctx)
+}
+
+func (s *Store) Plans() storage.PlansStore {
+	return s.plans
+}
+
+var _ storage.Repository = (*Store)(nil)

api/billing/fees/storage/mongo/store/plans.go

@@ -0,0 +1,144 @@
+package store
+
+import (
+	"context"
+	"errors"
+	"time"
+
+	"github.com/tech/sendico/billing/fees/storage"
+	"github.com/tech/sendico/billing/fees/storage/model"
+	"github.com/tech/sendico/pkg/db/repository"
+	"github.com/tech/sendico/pkg/db/repository/builder"
+	ri "github.com/tech/sendico/pkg/db/repository/index"
+	"github.com/tech/sendico/pkg/merrors"
+	"github.com/tech/sendico/pkg/mlogger"
+	m "github.com/tech/sendico/pkg/model"
+	"github.com/tech/sendico/pkg/mservice"
+	"go.mongodb.org/mongo-driver/bson/primitive"
+	"go.mongodb.org/mongo-driver/mongo"
+	"go.uber.org/zap"
+)
+
+type plansStore struct {
+	logger mlogger.Logger
+	repo   repository.Repository
+}
+
+// NewPlans constructs a Mongo-backed PlansStore.
+func NewPlans(logger mlogger.Logger, db *mongo.Database) (storage.PlansStore, error) {
+	repo := repository.CreateMongoRepository(db, mservice.FeePlans)
+
+	// Index for organisation lookups.
+	orgIndex := &ri.Definition{
+		Keys: []ri.Key{
+			{Field: m.OrganizationRefField, Sort: ri.Asc},
+			{Field: "effectiveFrom", Sort: ri.Desc},
+		},
+	}
+	if err := repo.CreateIndex(orgIndex); err != nil {
+		logger.Error("failed to ensure fee plan organization index", zap.Error(err))
+		return nil, err
+	}
+
+	// Unique index for plan versions (per organisation + effectiveFrom).
+	uniqueIndex := &ri.Definition{
+		Keys: []ri.Key{
+			{Field: m.OrganizationRefField, Sort: ri.Asc},
+			{Field: "effectiveFrom", Sort: ri.Asc},
+		},
+		Unique: true,
+	}
+	if err := repo.CreateIndex(uniqueIndex); err != nil {
+		logger.Error("failed to ensure fee plan uniqueness index", zap.Error(err))
+		return nil, err
+	}
+
+	return &plansStore{
+		logger: logger.Named("plans"),
+		repo:   repo,
+	}, nil
+}
+
+func (p *plansStore) Create(ctx context.Context, plan *model.FeePlan) error {
+	if plan == nil {
+		return merrors.InvalidArgument("plansStore: nil fee plan")
+	}
+	if err := p.repo.Insert(ctx, plan, nil); err != nil {
+		if errors.Is(err, merrors.ErrDataConflict) {
+			return storage.ErrDuplicateFeePlan
+		}
+		p.logger.Warn("failed to create fee plan", zap.Error(err))
+		return err
+	}
+	return nil
+}
+
+func (p *plansStore) Update(ctx context.Context, plan *model.FeePlan) error {
+	if plan == nil || plan.GetID() == nil || plan.GetID().IsZero() {
+		return merrors.InvalidArgument("plansStore: invalid fee plan reference")
+	}
+	if err := p.repo.Update(ctx, plan); err != nil {
+		p.logger.Warn("failed to update fee plan", zap.Error(err))
+		return err
+	}
+	return nil
+}
+
+func (p *plansStore) Get(ctx context.Context, planRef primitive.ObjectID) (*model.FeePlan, error) {
+	if planRef.IsZero() {
+		return nil, merrors.InvalidArgument("plansStore: zero plan reference")
+	}
+	result := &model.FeePlan{}
+	if err := p.repo.Get(ctx, planRef, result); err != nil {
+		if errors.Is(err, merrors.ErrNoData) {
+			return nil, storage.ErrFeePlanNotFound
+		}
+		return nil, err
+	}
+	return result, nil
+}
+
+func (p *plansStore) GetActivePlan(ctx context.Context, orgRef primitive.ObjectID, at time.Time) (*model.FeePlan, error) {
+	if orgRef.IsZero() {
+		return nil, merrors.InvalidArgument("plansStore: zero organization reference")
+	}
+
+	limit := int64(1)
+	query := repository.Query().
+		Filter(repository.OrgField(), orgRef).
+		Filter(repository.Field("active"), true).
+		Comparison(repository.Field("effectiveFrom"), builder.Lte, at).
+		Sort(repository.Field("effectiveFrom"), false).
+		Limit(&limit)
+
+	query = query.And(
+		repository.Query().Or(
+			repository.Query().Filter(repository.Field("effectiveTo"), nil),
+			repository.Query().Comparison(repository.Field("effectiveTo"), builder.Gte, at),
+		),
+	)
+
+	var plan *model.FeePlan
+	decoder := func(cursor *mongo.Cursor) error {
+		target := &model.FeePlan{}
+		if err := cursor.Decode(target); err != nil {
+			return err
+		}
+		plan = target
+		return nil
+	}
+
+	if err := p.repo.FindManyByFilter(ctx, query, decoder); err != nil {
+		if errors.Is(err, merrors.ErrNoData) {
+			return nil, storage.ErrFeePlanNotFound
+		}
+		return nil, err
+	}
+
+	if plan == nil {
+		return nil, storage.ErrFeePlanNotFound
+	}
+	return plan, nil
+}
+
+var _ storage.PlansStore = (*plansStore)(nil)

api/billing/fees/storage/storage.go

@@ -0,0 +1,36 @@
+package storage
+
+import (
+	"context"
+	"time"
+
+	"github.com/tech/sendico/billing/fees/storage/model"
+	"go.mongodb.org/mongo-driver/bson/primitive"
+)
+
+type storageError string
+
+func (e storageError) Error() string {
+	return string(e)
+}
+
+var (
+	// ErrFeePlanNotFound indicates that a requested fee plan does not exist.
+	ErrFeePlanNotFound = storageError("billing.fees.storage: fee plan not found")
+	// ErrDuplicateFeePlan indicates that a unique plan constraint was violated.
+	ErrDuplicateFeePlan = storageError("billing.fees.storage: duplicate fee plan")
+)
+
+// Repository defines the root storage contract for the fees service.
+type Repository interface {
+	Ping(ctx context.Context) error
+	Plans() PlansStore
+}
+
+// PlansStore exposes persistence operations for fee plans.
+type PlansStore interface {
+	Create(ctx context.Context, plan *model.FeePlan) error
+	Update(ctx context.Context, plan *model.FeePlan) error
+	Get(ctx context.Context, planRef primitive.ObjectID) (*model.FeePlan, error)
+	GetActivePlan(ctx context.Context, orgRef primitive.ObjectID, at time.Time) (*model.FeePlan, error)
+}

api/fx/ingestor/.air.toml

@@ -0,0 +1,32 @@
+# Config file for Air in TOML format
+
+root = "./../.."
+tmp_dir = "tmp"
+
+[build]
+cmd = "go build -o app -ldflags \"-X 'github.com/tech/sendico/fx/ingestor/internal/appversion.BuildUser=$(whoami)' -X 'github.com/tech/sendico/fx/ingestor/internal/appversion.Version=$APP_V' -X 'github.com/tech/sendico/fx/ingestor/internal/appversion.Branch=$BUILD_BRANCH' -X 'github.com/tech/sendico/fx/ingestor/internal/appversion.Revision=$GIT_REV' -X 'github.com/tech/sendico/fx/ingestor/internal/appversion.BuildDate=$(date)'\""
+bin = "./app"
+full_bin = "./app --debug --config.file=config.yml"
+include_ext = ["go", "yaml", "yml"]
+exclude_dir = ["fx/ingestor/tmp", "pkg/.git", "fx/ingestor/env"]
+exclude_regex = ["_test\\.go"]
+exclude_unchanged = true
+follow_symlink = true
+log = "air.log"
+delay = 0
+stop_on_error = true
+send_interrupt = true
+kill_delay = 500
+args_bin = []
+
+[log]
+time = false
+
+[color]
+main = "magenta"
+watcher = "cyan"
+build = "yellow"
+runner = "green"
+
+[misc]
+clean_on_exit = true

api/fx/ingestor/.gitignore

@@ -0,0 +1,3 @@
+internal/generated
+.gocache
+/app

api/fx/ingestor/config.yml

@@ -0,0 +1,43 @@
+poll_interval_seconds: 30
+
+market:
+  sources:
+    - driver: BINANCE
+      settings:
+        base_url: "https://api.binance.com"
+    - driver: COINGECKO
+      settings:
+        base_url: "https://api.coingecko.com/api/v3"
+  pairs:
+    BINANCE:
+      - base: "USDT"
+        quote: "EUR"
+        symbol: "EURUSDT"
+        invert: true
+      - base: "UAH"
+        quote: "USDT"
+        symbol: "USDTUAH"
+        invert: true
+      - base: "USDC"
+        quote: "EUR"
+        symbol: "EURUSDC"
+        invert: true
+    COINGECKO:
+      - base: "USDT"
+        quote: "RUB"
+        symbol: "tether:rub"
+
+metrics:
+  enabled: true
+  address: ":9102"
+
+database:
+  driver: mongodb
+  settings:
+    host_env: FX_MONGO_HOST
+    port_env: FX_MONGO_PORT
+    database_env: FX_MONGO_DATABASE
+    user_env: FX_MONGO_USER
+    password_env: FX_MONGO_PASSWORD
+    auth_source_env: FX_MONGO_AUTH_SOURCE
+    replica_set_env: FX_MONGO_REPLICA_SET

api/fx/ingestor/env/.gitignore

@@ -0,0 +1 @@
+.env.api

api/fx/ingestor/go.mod

@@ -0,0 +1,55 @@
+module github.com/tech/sendico/fx/ingestor
+
+go 1.25.3
+
+replace github.com/tech/sendico/pkg => ../../pkg
+
+replace github.com/tech/sendico/fx/storage => ../storage
+
+require (
+	github.com/go-chi/chi/v5 v5.2.3
+	github.com/google/go-cmp v0.7.0
+	github.com/prometheus/client_golang v1.23.2
+	github.com/tech/sendico/fx/storage v0.0.0
+	github.com/tech/sendico/pkg v0.1.0
+	go.uber.org/zap v1.27.1
+	gopkg.in/yaml.v3 v3.0.1
+)
+
+require (
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/bmatcuk/doublestar/v4 v4.9.1 // indirect
+	github.com/casbin/casbin/v2 v2.134.0 // indirect
+	github.com/casbin/govaluate v1.10.0 // indirect
+	github.com/casbin/mongodb-adapter/v3 v3.7.0 // indirect
+	github.com/cespare/xxhash/v2 v2.3.0 // indirect
+	github.com/golang/snappy v1.0.0 // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	github.com/klauspost/compress v1.18.2 // indirect
+	github.com/mattn/go-colorable v0.1.14 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/mitchellh/mapstructure v1.5.0 // indirect
+	github.com/montanaflynn/stats v0.7.1 // indirect
+	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
+	github.com/nats-io/nats.go v1.47.0 // indirect
+	github.com/nats-io/nkeys v0.4.12 // indirect
+	github.com/nats-io/nuid v1.0.1 // indirect
+	github.com/prometheus/client_model v0.6.2 // indirect
+	github.com/prometheus/common v0.67.4 // indirect
+	github.com/prometheus/procfs v0.19.2 // indirect
+	github.com/xdg-go/pbkdf2 v1.0.0 // indirect
+	github.com/xdg-go/scram v1.2.0 // indirect
+	github.com/xdg-go/stringprep v1.0.4 // indirect
+	github.com/youmark/pkcs8 v0.0.0-20240726163527-a2c0da244d78 // indirect
+	go.mongodb.org/mongo-driver v1.17.6 // indirect
+	go.uber.org/multierr v1.11.0 // indirect
+	go.yaml.in/yaml/v2 v2.4.3 // indirect
+	golang.org/x/crypto v0.45.0 // indirect
+	golang.org/x/net v0.47.0 // indirect
+	golang.org/x/sync v0.18.0 // indirect
+	golang.org/x/sys v0.38.0 // indirect
+	golang.org/x/text v0.31.0 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20251202230838-ff82c1b0f217 // indirect
+	google.golang.org/grpc v1.77.0 // indirect
+	google.golang.org/protobuf v1.36.10 // indirect
+)

api/fx/ingestor/go.sum

@@ -0,0 +1,225 @@
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+github.com/Azure/go-ansiterm v0.0.0-20230124172434-306776ec8161/go.mod h1:xomTg63KZ2rFqZQzSB4Vz2SUXa1BpHTVz9L5PTmPC4E=
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+golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
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+golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.38.0 h1:3yZWxaJjBmCWXqhN1qh02AkOnCQ1poK6oF+a7xWL6Gc=
+golang.org/x/sys v0.38.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks=
+golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
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+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
+golang.org/x/text v0.3.8/go.mod h1:E6s5w1FMmriuDzIBO73fBruAKo1PCIq6d2Q6DHfQ8WQ=
+golang.org/x/text v0.31.0 h1:aC8ghyu4JhP8VojJ2lEHBnochRno1sgL6nEi9WGFGMM=
+golang.org/x/text v0.31.0/go.mod h1:tKRAlv61yKIjGGHX/4tP1LTbc13YSec1pxVEWXzfoeM=
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+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

api/fx/ingestor/internal/app/app.go

@@ -0,0 +1,82 @@
+package app
+
+import (
+	"context"
+	"errors"
+	"strings"
+
+	"github.com/tech/sendico/fx/ingestor/internal/appversion"
+	"github.com/tech/sendico/fx/ingestor/internal/config"
+	"github.com/tech/sendico/fx/ingestor/internal/fmerrors"
+	"github.com/tech/sendico/fx/ingestor/internal/ingestor"
+	"github.com/tech/sendico/fx/ingestor/internal/metrics"
+	mongostorage "github.com/tech/sendico/fx/storage/mongo"
+	"github.com/tech/sendico/pkg/api/routers/health"
+	"github.com/tech/sendico/pkg/db"
+	"github.com/tech/sendico/pkg/mlogger"
+	"go.uber.org/zap"
+)
+
+const DefaultConfigPath = "config.yml"
+
+type App struct {
+	logger mlogger.Logger
+	cfg    *config.Config
+}
+
+func New(logger mlogger.Logger, cfgPath string) (*App, error) {
+	if logger == nil {
+		return nil, fmerrors.New("app: logger is nil")
+	}
+	path := strings.TrimSpace(cfgPath)
+	if path == "" {
+		path = DefaultConfigPath
+	}
+	cfg, err := config.Load(path)
+	if err != nil {
+		return nil, err
+	}
+	return &App{
+		logger: logger,
+		cfg:    cfg,
+	}, nil
+}
+
+func (a *App) Run(ctx context.Context) error {
+	metricsSrv, err := metrics.NewServer(a.logger, a.cfg.MetricsConfig())
+	if err != nil {
+		return err
+	}
+	a.logger.Debug("Metrics server initialised")
+	defer metricsSrv.Close(context.Background())
+
+	conn, err := db.ConnectMongo(a.logger, a.cfg.Database)
+	if err != nil {
+		return err
+	}
+	defer conn.Disconnect(context.Background())
+	a.logger.Debug("MongoDB connection established")
+
+	repo, err := mongostorage.New(a.logger, conn)
+	if err != nil {
+		return err
+	}
+	a.logger.Debug("Storage repository initialised")
+
+	service, err := ingestor.New(a.logger, a.cfg, repo)
+	if err != nil {
+		return err
+	}
+
+	a.logger.Info("Starting FX ingestor service", zap.String("version", appversion.Create().Info()))
+	metricsSrv.SetStatus(health.SSRunning)
+
+	if err := service.Run(ctx); err != nil {
+		if !errors.Is(err, context.Canceled) { // ignore termination reques error
+			a.logger.Error("Ingestor service exited with error", zap.Error(err))
+		}
+		return err
+	}
+	a.logger.Info("Ingestor service stopped")
+	return nil
+}

api/fx/ingestor/internal/appversion/version.go

@@ -0,0 +1,27 @@
+package appversion
+
+import (
+	"github.com/tech/sendico/pkg/version"
+	vf "github.com/tech/sendico/pkg/version/factory"
+)
+
+// Build information. Populated at build-time.
+var (
+	Version   string
+	Revision  string
+	Branch    string
+	BuildUser string
+	BuildDate string
+)
+
+func Create() version.Printer {
+	vi := version.Info{
+		Program:   "Sendico FX Ingestor Service",
+		Revision:  Revision,
+		Branch:    Branch,
+		BuildUser: BuildUser,
+		BuildDate: BuildDate,
+		Version:   Version,
+	}
+	return vf.Create(&vi)
+}

api/fx/ingestor/internal/config/config.go

@@ -0,0 +1,147 @@
+package config
+
+import (
+	"os"
+	"strings"
+	"time"
+
+	"github.com/tech/sendico/fx/ingestor/internal/fmerrors"
+	mmodel "github.com/tech/sendico/fx/ingestor/internal/model"
+	"github.com/tech/sendico/pkg/db"
+	"gopkg.in/yaml.v3"
+)
+
+const defaultPollInterval = 30 * time.Second
+
+type Config struct {
+	PollIntervalSeconds int            `yaml:"poll_interval_seconds"`
+	Market              MarketConfig   `yaml:"market"`
+	Database            *db.Config     `yaml:"database"`
+	Metrics             *MetricsConfig `yaml:"metrics"`
+
+	pairs         []Pair
+	pairsBySource map[mmodel.Driver][]PairConfig
+}
+
+func Load(path string) (*Config, error) {
+	if path == "" {
+		return nil, fmerrors.New("config: path is empty")
+	}
+
+	data, err := os.ReadFile(path)
+	if err != nil {
+		return nil, fmerrors.Wrap("config: failed to read file", err)
+	}
+
+	cfg := &Config{}
+	if err := yaml.Unmarshal(data, cfg); err != nil {
+		return nil, fmerrors.Wrap("config: failed to parse yaml", err)
+	}
+
+	if len(cfg.Market.Sources) == 0 {
+		return nil, fmerrors.New("config: no market sources configured")
+	}
+	sourceSet := make(map[mmodel.Driver]struct{}, len(cfg.Market.Sources))
+	for idx := range cfg.Market.Sources {
+		src := &cfg.Market.Sources[idx]
+		if src.Driver.IsEmpty() {
+			return nil, fmerrors.New("config: market source driver is empty")
+		}
+		sourceSet[src.Driver] = struct{}{}
+	}
+
+	if len(cfg.Market.Pairs) == 0 {
+		return nil, fmerrors.New("config: no pairs configured")
+	}
+
+	normalizedPairs := make(map[string][]PairConfig, len(cfg.Market.Pairs))
+	pairsBySource := make(map[mmodel.Driver][]PairConfig, len(cfg.Market.Pairs))
+	var flattened []Pair
+
+	for rawSource, pairList := range cfg.Market.Pairs {
+		driver := mmodel.Driver(rawSource)
+		if driver.IsEmpty() {
+			return nil, fmerrors.New("config: pair source is empty")
+		}
+		if _, ok := sourceSet[driver]; !ok {
+			return nil, fmerrors.New("config: pair references unknown source: " + driver.String())
+		}
+
+		processed := make([]PairConfig, len(pairList))
+		for idx := range pairList {
+			pair := pairList[idx]
+			pair.Base = strings.ToUpper(strings.TrimSpace(pair.Base))
+			pair.Quote = strings.ToUpper(strings.TrimSpace(pair.Quote))
+			pair.Symbol = strings.TrimSpace(pair.Symbol)
+			if pair.Base == "" || pair.Quote == "" || pair.Symbol == "" {
+				return nil, fmerrors.New("config: pair entries must define base, quote, and symbol")
+			}
+			if strings.TrimSpace(pair.Provider) == "" {
+				pair.Provider = strings.ToLower(driver.String())
+			}
+			processed[idx] = pair
+			flattened = append(flattened, Pair{
+				PairConfig: pair,
+				Source:     driver,
+			})
+		}
+		pairsBySource[driver] = processed
+		normalizedPairs[driver.String()] = processed
+	}
+
+	cfg.Market.Pairs = normalizedPairs
+	cfg.pairsBySource = pairsBySource
+	cfg.pairs = flattened
+	if cfg.Database == nil {
+		return nil, fmerrors.New("config: database configuration is required")
+	}
+
+	if cfg.Metrics != nil && cfg.Metrics.Enabled {
+		cfg.Metrics.Address = strings.TrimSpace(cfg.Metrics.Address)
+		if cfg.Metrics.Address == "" {
+			cfg.Metrics.Address = ":9102"
+		}
+	}
+
+	return cfg, nil
+}
+
+func (c *Config) PollInterval() time.Duration {
+	if c == nil {
+		return defaultPollInterval
+	}
+	if c.PollIntervalSeconds <= 0 {
+		return defaultPollInterval
+	}
+	return time.Duration(c.PollIntervalSeconds) * time.Second
+}
+
+func (c *Config) Pairs() []Pair {
+	if c == nil {
+		return nil
+	}
+	out := make([]Pair, len(c.pairs))
+	copy(out, c.pairs)
+	return out
+}
+
+func (c *Config) PairsBySource() map[mmodel.Driver][]PairConfig {
+	if c == nil {
+		return nil
+	}
+	out := make(map[mmodel.Driver][]PairConfig, len(c.pairsBySource))
+	for driver, pairs := range c.pairsBySource {
+		cp := make([]PairConfig, len(pairs))
+		copy(cp, pairs)
+		out[driver] = cp
+	}
+	return out
+}
+
+func (c *Config) MetricsConfig() *MetricsConfig {
+	if c == nil || c.Metrics == nil {
+		return nil
+	}
+	cp := *c.Metrics
+	return &cp
+}

api/fx/ingestor/internal/config/market.go

@@ -0,0 +1,24 @@
+package config
+
+import (
+	mmodel "github.com/tech/sendico/fx/ingestor/internal/model"
+	pmodel "github.com/tech/sendico/pkg/model"
+)
+
+type PairConfig struct {
+	Base     string `yaml:"base"`
+	Quote    string `yaml:"quote"`
+	Symbol   string `yaml:"symbol"`
+	Provider string `yaml:"provider"`
+	Invert   bool   `yaml:"invert"`
+}
+
+type Pair struct {
+	PairConfig `yaml:",inline"`
+	Source     mmodel.Driver `yaml:"-"`
+}
+
+type MarketConfig struct {
+	Sources []pmodel.DriverConfig[mmodel.Driver] `yaml:"sources"`
+	Pairs   map[string][]PairConfig              `yaml:"pairs"`
+}

api/fx/ingestor/internal/config/metrics.go

@@ -0,0 +1,6 @@
+package config
+
+type MetricsConfig struct {
+	Enabled bool   `yaml:"enabled"`
+	Address string `yaml:"address"`
+}

api/fx/ingestor/internal/fmerrors/market.go

@@ -0,0 +1,35 @@
+package fmerrors
+
+type Error struct {
+	message string
+	cause   error
+}
+
+func (e *Error) Error() string {
+	if e == nil {
+		return ""
+	}
+	if e.cause == nil {
+		return e.message
+	}
+	return e.message + ": " + e.cause.Error()
+}
+
+func (e *Error) Unwrap() error {
+	if e == nil {
+		return nil
+	}
+	return e.cause
+}
+
+func New(message string) error {
+	return &Error{message: message}
+}
+
+func Wrap(message string, cause error) error {
+	return &Error{message: message, cause: cause}
+}
+
+func NewDecimal(value string) error {
+	return &Error{message: "invalid decimal \"" + value + "\""}
+}

api/fx/ingestor/internal/ingestor/metrics.go

@@ -0,0 +1,84 @@
+package ingestor
+
+import (
+	"sync"
+	"time"
+
+	"github.com/tech/sendico/fx/ingestor/internal/config"
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promauto"
+)
+
+type serviceMetrics struct {
+	pollDuration   *prometheus.HistogramVec
+	pollTotal      *prometheus.CounterVec
+	pairDuration   *prometheus.HistogramVec
+	pairTotal      *prometheus.CounterVec
+	pairLastUpdate *prometheus.GaugeVec
+}
+
+var (
+	metricsOnce      sync.Once
+	globalMetricsRef *serviceMetrics
+)
+
+func getServiceMetrics() *serviceMetrics {
+	metricsOnce.Do(func() {
+		reg := prometheus.DefaultRegisterer
+		globalMetricsRef = &serviceMetrics{
+			pollDuration: promauto.With(reg).NewHistogramVec(prometheus.HistogramOpts{
+				Name:    "fx_ingestor_poll_duration_seconds",
+				Help:    "Duration of a polling cycle.",
+				Buckets: prometheus.DefBuckets,
+			}, []string{"result"}),
+			pollTotal: promauto.With(reg).NewCounterVec(prometheus.CounterOpts{
+				Name: "fx_ingestor_poll_total",
+				Help: "Total polling cycles executed.",
+			}, []string{"result"}),
+			pairDuration: promauto.With(reg).NewHistogramVec(prometheus.HistogramOpts{
+				Name:    "fx_ingestor_pair_duration_seconds",
+				Help:    "Duration of individual pair ingestion.",
+				Buckets: prometheus.DefBuckets,
+			}, []string{"source", "provider", "symbol", "result"}),
+			pairTotal: promauto.With(reg).NewCounterVec(prometheus.CounterOpts{
+				Name: "fx_ingestor_pair_total",
+				Help: "Total ingestion attempts per pair.",
+			}, []string{"source", "provider", "symbol", "result"}),
+			pairLastUpdate: promauto.With(reg).NewGaugeVec(prometheus.GaugeOpts{
+				Name: "fx_ingestor_pair_last_success_unix",
+				Help: "Unix timestamp of the last successful ingestion per pair.",
+			}, []string{"source", "provider", "symbol"}),
+		}
+	})
+	return globalMetricsRef
+}
+
+func (m *serviceMetrics) observePoll(duration time.Duration, err error) {
+	if m == nil {
+		return
+	}
+	result := labelForError(err)
+	m.pollDuration.WithLabelValues(result).Observe(duration.Seconds())
+	m.pollTotal.WithLabelValues(result).Inc()
+}
+
+func (m *serviceMetrics) observePair(pair config.Pair, duration time.Duration, err error) {
+	if m == nil {
+		return
+	}
+	result := labelForError(err)
+	labels := []string{pair.Source.String(), pair.Provider, pair.Symbol, result}
+	m.pairDuration.WithLabelValues(labels...).Observe(duration.Seconds())
+	m.pairTotal.WithLabelValues(labels...).Inc()
+	if err == nil {
+		m.pairLastUpdate.WithLabelValues(pair.Source.String(), pair.Provider, pair.Symbol).
+			Set(float64(time.Now().Unix()))
+	}
+}
+
+func labelForError(err error) string {
+	if err != nil {
+		return "error"
+	}
+	return "success"
+}

api/fx/ingestor/internal/ingestor/service.go

@@ -0,0 +1,207 @@
+package ingestor
+
+import (
+	"context"
+	"math/big"
+	"time"
+
+	"github.com/tech/sendico/fx/ingestor/internal/config"
+	"github.com/tech/sendico/fx/ingestor/internal/fmerrors"
+	"github.com/tech/sendico/fx/ingestor/internal/market"
+	mmodel "github.com/tech/sendico/fx/ingestor/internal/model"
+	"github.com/tech/sendico/fx/storage"
+	"github.com/tech/sendico/fx/storage/model"
+	"github.com/tech/sendico/pkg/mlogger"
+	"go.uber.org/zap"
+)
+
+type Service struct {
+	logger     mlogger.Logger
+	cfg        *config.Config
+	rates      storage.RatesStore
+	pairs      []config.Pair
+	connectors map[mmodel.Driver]mmodel.Connector
+	metrics    *serviceMetrics
+}
+
+func New(logger mlogger.Logger, cfg *config.Config, repo storage.Repository) (*Service, error) {
+	if logger == nil {
+		return nil, fmerrors.New("ingestor: nil logger")
+	}
+	if cfg == nil {
+		return nil, fmerrors.New("ingestor: nil config")
+	}
+	if repo == nil {
+		return nil, fmerrors.New("ingestor: nil repository")
+	}
+
+	connectors, err := market.BuildConnectors(logger, cfg.Market.Sources)
+	if err != nil {
+		return nil, fmerrors.Wrap("build connectors", err)
+	}
+
+	return &Service{
+		logger:     logger.Named("ingestor"),
+		cfg:        cfg,
+		rates:      repo.Rates(),
+		pairs:      cfg.Pairs(),
+		connectors: connectors,
+		metrics:    getServiceMetrics(),
+	}, nil
+}
+
+func (s *Service) Run(ctx context.Context) error {
+	interval := s.cfg.PollInterval()
+	ticker := time.NewTicker(interval)
+	defer ticker.Stop()
+
+	s.logger.Info("FX ingestion service started", zap.Duration("poll_interval", interval), zap.Int("pairs", len(s.pairs)))
+
+	if err := s.executePoll(ctx); err != nil {
+		s.logger.Warn("Initial poll completed with errors", zap.Error(err))
+	}
+
+	for {
+		select {
+		case <-ctx.Done():
+			s.logger.Info("Context cancelled, stopping ingestor")
+			return ctx.Err()
+		case <-ticker.C:
+			if err := s.executePoll(ctx); err != nil {
+				s.logger.Warn("Polling cycle completed with errors", zap.Error(err))
+			}
+		}
+	}
+}
+
+func (s *Service) executePoll(ctx context.Context) error {
+	start := time.Now()
+	err := s.pollOnce(ctx)
+	if s.metrics != nil {
+		s.metrics.observePoll(time.Since(start), err)
+	}
+	return err
+}
+
+func (s *Service) pollOnce(ctx context.Context) error {
+	var firstErr error
+	for _, pair := range s.pairs {
+		start := time.Now()
+		err := s.upsertPair(ctx, pair)
+		elapsed := time.Since(start)
+		if s.metrics != nil {
+			s.metrics.observePair(pair, elapsed, err)
+		}
+		if err != nil {
+			if firstErr == nil {
+				firstErr = err
+			}
+			s.logger.Warn("Failed to ingest pair",
+				zap.String("symbol", pair.Symbol),
+				zap.String("source", pair.Source.String()),
+				zap.Duration("elapsed", elapsed),
+				zap.Error(err),
+			)
+		}
+	}
+	return firstErr
+}
+
+func (s *Service) upsertPair(ctx context.Context, pair config.Pair) error {
+	connector, ok := s.connectors[pair.Source]
+	if !ok {
+		return fmerrors.Wrap("connector not configured for source "+pair.Source.String(), nil)
+	}
+
+	ticker, err := connector.FetchTicker(ctx, pair.Symbol)
+	if err != nil {
+		return fmerrors.Wrap("fetch ticker", err)
+	}
+
+	bid, err := parseDecimal(ticker.BidPrice)
+	if err != nil {
+		return fmerrors.Wrap("parse bid price", err)
+	}
+	ask, err := parseDecimal(ticker.AskPrice)
+	if err != nil {
+		return fmerrors.Wrap("parse ask price", err)
+	}
+
+	if pair.Invert {
+		bid, ask = invertPrices(bid, ask)
+	}
+
+	if ask.Cmp(bid) < 0 {
+		// Ensure bid <= ask to keep downstream logic predictable.
+		bid, ask = ask, bid
+	}
+
+	mid := new(big.Rat).Add(bid, ask)
+	mid.Quo(mid, big.NewRat(2, 1))
+
+	spread := big.NewRat(0, 1)
+	if mid.Sign() != 0 {
+		spread.Sub(ask, bid)
+		if spread.Sign() < 0 {
+			spread.Neg(spread)
+		}
+		spread.Quo(spread, mid)
+		spread.Mul(spread, big.NewRat(10000, 1)) // basis points
+	}
+
+	now := time.Now().UTC()
+	asOf := now
+	snapshot := &model.RateSnapshot{
+		RateRef:     market.BuildRateReference(pair.Provider, pair.Symbol, now),
+		Pair:        model.CurrencyPair{Base: pair.Base, Quote: pair.Quote},
+		Provider:    pair.Provider,
+		Mid:         formatDecimal(mid),
+		Bid:         formatDecimal(bid),
+		Ask:         formatDecimal(ask),
+		SpreadBps:   formatDecimal(spread),
+		AsOfUnixMs:  now.UnixMilli(),
+		AsOf:        &asOf,
+		Source:      ticker.Provider,
+		ProviderRef: ticker.Symbol,
+	}
+
+	if err := s.rates.UpsertSnapshot(ctx, snapshot); err != nil {
+		return fmerrors.Wrap("upsert snapshot", err)
+	}
+
+	s.logger.Debug("Snapshot ingested",
+		zap.String("pair", pair.Base+"/"+pair.Quote),
+		zap.String("provider", pair.Provider),
+		zap.String("bid", snapshot.Bid),
+		zap.String("ask", snapshot.Ask),
+		zap.String("mid", snapshot.Mid),
+	)
+
+	return nil
+}
+
+func parseDecimal(value string) (*big.Rat, error) {
+	r := new(big.Rat)
+	if _, ok := r.SetString(value); !ok {
+		return nil, fmerrors.NewDecimal(value)
+	}
+	return r, nil
+}
+
+func invertPrices(bid, ask *big.Rat) (*big.Rat, *big.Rat) {
+	if bid.Sign() == 0 || ask.Sign() == 0 {
+		return bid, ask
+	}
+	one := big.NewRat(1, 1)
+	invBid := new(big.Rat).Quo(one, ask) // invert ask to get bid
+	invAsk := new(big.Rat).Quo(one, bid) // invert bid to get ask
+	return invBid, invAsk
+}
+
+func formatDecimal(r *big.Rat) string {
+	if r == nil {
+		return "0"
+	}
+	// Format with 8 decimal places, trimming trailing zeros.
+	return r.FloatString(8)
+}

api/fx/ingestor/internal/ingestor/service_test.go

@@ -0,0 +1,237 @@
+package ingestor
+
+import (
+	"context"
+	"errors"
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+	"github.com/tech/sendico/fx/ingestor/internal/config"
+	"github.com/tech/sendico/fx/ingestor/internal/fmerrors"
+	mmarket "github.com/tech/sendico/fx/ingestor/internal/model"
+	"github.com/tech/sendico/fx/storage"
+	"github.com/tech/sendico/fx/storage/model"
+	"go.uber.org/zap"
+)
+
+func TestParseDecimal(t *testing.T) {
+	got, err := parseDecimal("123.456")
+	if err != nil {
+		t.Fatalf("parseDecimal returned error: %v", err)
+	}
+	if got.String() != "15432/125" { // 123.456 expressed as a rational
+		t.Fatalf("unexpected rational value: %s", got.String())
+	}
+
+	if _, err := parseDecimal("not-a-number"); err == nil {
+		t.Fatalf("parseDecimal should fail on invalid decimal string")
+	}
+}
+
+func TestInvertPrices(t *testing.T) {
+	bid, err := parseDecimal("2")
+	if err != nil {
+		t.Fatalf("parseDecimal: %v", err)
+	}
+	ask, err := parseDecimal("4")
+	if err != nil {
+		t.Fatalf("parseDecimal: %v", err)
+	}
+
+	invBid, invAsk := invertPrices(bid, ask)
+	if diff := cmp.Diff("0.5", invAsk.FloatString(1)); diff != "" {
+		t.Fatalf("unexpected inverted ask (-want +got):\n%s", diff)
+	}
+	if diff := cmp.Diff("0.25", invBid.FloatString(2)); diff != "" {
+		t.Fatalf("unexpected inverted bid (-want +got):\n%s", diff)
+	}
+}
+
+func TestServiceUpsertPairStoresSnapshot(t *testing.T) {
+	store := &ratesStoreStub{}
+	svc := testService(store, map[mmarket.Driver]mmarket.Connector{
+		mmarket.DriverBinance: &connectorStub{
+			id: mmarket.DriverBinance,
+			ticker: &mmarket.Ticker{
+				Symbol:   "EURUSDT",
+				BidPrice: "1.0000",
+				AskPrice: "1.2000",
+				Provider: "binance",
+			},
+		},
+	})
+
+	pair := config.Pair{
+		PairConfig: config.PairConfig{
+			Base:     "USDT",
+			Quote:    "EUR",
+			Symbol:   "EURUSDT",
+			Provider: "binance",
+		},
+		Source: mmarket.DriverBinance,
+	}
+
+	if err := svc.upsertPair(context.Background(), pair); err != nil {
+		t.Fatalf("upsertPair returned error: %v", err)
+	}
+	if len(store.snapshots) != 1 {
+		t.Fatalf("expected 1 snapshot stored, got %d", len(store.snapshots))
+	}
+	snap := store.snapshots[0]
+	if snap.Pair.Base != "USDT" || snap.Pair.Quote != "EUR" {
+		t.Fatalf("unexpected currency pair stored: %+v", snap.Pair)
+	}
+	if snap.Provider != "binance" {
+		t.Fatalf("unexpected provider: %s", snap.Provider)
+	}
+	if snap.Bid != "1.00000000" || snap.Ask != "1.20000000" {
+		t.Fatalf("unexpected bid/ask: %s / %s", snap.Bid, snap.Ask)
+	}
+	if snap.Mid != "1.10000000" {
+		t.Fatalf("unexpected mid price: %s", snap.Mid)
+	}
+	if snap.SpreadBps != "1818.18181818" {
+		t.Fatalf("unexpected spread bps: %s", snap.SpreadBps)
+	}
+}
+
+func TestServiceUpsertPairInvertsPrices(t *testing.T) {
+	store := &ratesStoreStub{}
+	svc := testService(store, map[mmarket.Driver]mmarket.Connector{
+		mmarket.DriverCoinGecko: &connectorStub{
+			id: mmarket.DriverCoinGecko,
+			ticker: &mmarket.Ticker{
+				Symbol:   "RUBUSDT",
+				BidPrice: "2",
+				AskPrice: "4",
+				Provider: "coingecko",
+			},
+		},
+	})
+
+	pair := config.Pair{
+		PairConfig: config.PairConfig{
+			Base:     "RUB",
+			Quote:    "USDT",
+			Symbol:   "RUBUSDT",
+			Provider: "coingecko",
+			Invert:   true,
+		},
+		Source: mmarket.DriverCoinGecko,
+	}
+
+	if err := svc.upsertPair(context.Background(), pair); err != nil {
+		t.Fatalf("upsertPair returned error: %v", err)
+	}
+
+	snap := store.snapshots[0]
+	if snap.Bid != "0.25000000" || snap.Ask != "0.50000000" {
+		t.Fatalf("unexpected inverted bid/ask: %s / %s", snap.Bid, snap.Ask)
+	}
+}
+
+func TestServicePollOnceReturnsFirstError(t *testing.T) {
+	errFetch := fmerrors.New("fetch failed")
+	connectorSuccess := &connectorStub{
+		id: mmarket.DriverBinance,
+		ticker: &mmarket.Ticker{
+			Symbol:   "EURUSDT",
+			BidPrice: "1",
+			AskPrice: "1",
+			Provider: "binance",
+		},
+	}
+	connectorFail := &connectorStub{
+		id:  mmarket.DriverCoinGecko,
+		err: errFetch,
+	}
+
+	store := &ratesStoreStub{}
+	svc := testService(store, map[mmarket.Driver]mmarket.Connector{
+		mmarket.DriverBinance:   connectorSuccess,
+		mmarket.DriverCoinGecko: connectorFail,
+	})
+	svc.pairs = []config.Pair{
+		{PairConfig: config.PairConfig{Base: "USDT", Quote: "EUR", Symbol: "EURUSDT"}, Source: mmarket.DriverBinance},
+		{PairConfig: config.PairConfig{Base: "USDT", Quote: "RUB", Symbol: "RUBUSDT"}, Source: mmarket.DriverCoinGecko},
+	}
+
+	err := svc.pollOnce(context.Background())
+	if err == nil {
+		t.Fatalf("pollOnce expected to return error")
+	}
+	if !errors.Is(err, errFetch) {
+		t.Fatalf("pollOnce returned unexpected error: %v", err)
+	}
+	if connectorSuccess.calls != 1 {
+		t.Fatalf("expected success connector called once, got %d", connectorSuccess.calls)
+	}
+	if connectorFail.calls != 1 {
+		t.Fatalf("expected failing connector called once, got %d", connectorFail.calls)
+	}
+	if len(store.snapshots) != 1 {
+		t.Fatalf("expected snapshot stored only for successful pair, got %d", len(store.snapshots))
+	}
+}
+
+// -- test helpers -----------------------------------------------------------------
+
+type ratesStoreStub struct {
+	snapshots []*model.RateSnapshot
+	err       error
+}
+
+func (r *ratesStoreStub) UpsertSnapshot(_ context.Context, snapshot *model.RateSnapshot) error {
+	if r.err != nil {
+		return r.err
+	}
+	cp := *snapshot
+	r.snapshots = append(r.snapshots, &cp)
+	return nil
+}
+
+func (r *ratesStoreStub) LatestSnapshot(context.Context, model.CurrencyPair, string) (*model.RateSnapshot, error) {
+	return nil, nil
+}
+
+type repositoryStub struct {
+	rates storage.RatesStore
+}
+
+func (r *repositoryStub) Ping(context.Context) error        { return nil }
+func (r *repositoryStub) Rates() storage.RatesStore         { return r.rates }
+func (r *repositoryStub) Quotes() storage.QuotesStore       { return nil }
+func (r *repositoryStub) Pairs() storage.PairStore          { return nil }
+func (r *repositoryStub) Currencies() storage.CurrencyStore { return nil }
+
+type connectorStub struct {
+	id     mmarket.Driver
+	ticker *mmarket.Ticker
+	err    error
+	calls  int
+}
+
+func (c *connectorStub) ID() mmarket.Driver {
+	return c.id
+}
+
+func (c *connectorStub) FetchTicker(_ context.Context, symbol string) (*mmarket.Ticker, error) {
+	c.calls++
+	if c.ticker != nil {
+		cp := *c.ticker
+		cp.Symbol = symbol
+		return &cp, c.err
+	}
+	return nil, c.err
+}
+
+func testService(store storage.RatesStore, connectors map[mmarket.Driver]mmarket.Connector) *Service {
+	return &Service{
+		logger:     zap.NewNop(),
+		cfg:        &config.Config{},
+		rates:      store,
+		connectors: connectors,
+		pairs:      nil,
+		metrics:    nil,
+	}
+}

api/fx/ingestor/internal/market/binance/connector.go

@@ -0,0 +1,139 @@
+package binance
+
+import (
+	"context"
+	"encoding/json"
+	"net"
+	"net/http"
+	"net/url"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/tech/sendico/fx/ingestor/internal/fmerrors"
+	"github.com/tech/sendico/fx/ingestor/internal/market/common"
+	mmodel "github.com/tech/sendico/fx/ingestor/internal/model"
+	"github.com/tech/sendico/pkg/mlogger"
+	"github.com/tech/sendico/pkg/model"
+	"go.uber.org/zap"
+)
+
+type binanceConnector struct {
+	id       mmodel.Driver
+	provider string
+	client   *http.Client
+	base     string
+	logger   mlogger.Logger
+}
+
+const defaultBinanceBaseURL = "https://api.binance.com"
+const (
+	defaultDialTimeoutSeconds           = 5 * time.Second
+	defaultDialKeepAliveSeconds         = 30 * time.Second
+	defaultTLSHandshakeTimeoutSeconds   = 5 * time.Second
+	defaultResponseHeaderTimeoutSeconds = 10 * time.Second
+	defaultRequestTimeoutSeconds        = 10 * time.Second
+)
+
+func NewConnector(logger mlogger.Logger, settings model.SettingsT) (mmodel.Connector, error) {
+	baseURL := defaultBinanceBaseURL
+	provider := strings.ToLower(mmodel.DriverBinance.String())
+	dialTimeout := defaultDialTimeoutSeconds
+	dialKeepAlive := defaultDialKeepAliveSeconds
+	tlsHandshakeTimeout := defaultTLSHandshakeTimeoutSeconds
+	responseHeaderTimeout := defaultResponseHeaderTimeoutSeconds
+	requestTimeout := defaultRequestTimeoutSeconds
+
+	if settings != nil {
+		if value, ok := settings["base_url"].(string); ok && strings.TrimSpace(value) != "" {
+			baseURL = strings.TrimSpace(value)
+		}
+		if value, ok := settings["provider"].(string); ok && strings.TrimSpace(value) != "" {
+			provider = strings.TrimSpace(value)
+		}
+		dialTimeout = common.DurationSetting(settings, "dial_timeout_seconds", dialTimeout)
+		dialKeepAlive = common.DurationSetting(settings, "dial_keep_alive_seconds", dialKeepAlive)
+		tlsHandshakeTimeout = common.DurationSetting(settings, "tls_handshake_timeout_seconds", tlsHandshakeTimeout)
+		responseHeaderTimeout = common.DurationSetting(settings, "response_header_timeout_seconds", responseHeaderTimeout)
+		requestTimeout = common.DurationSetting(settings, "request_timeout_seconds", requestTimeout)
+	}
+
+	parsed, err := url.Parse(baseURL)
+	if err != nil {
+		return nil, fmerrors.Wrap("binance: invalid base url", err)
+	}
+
+	transport := &http.Transport{
+		DialContext:           (&net.Dialer{Timeout: dialTimeout, KeepAlive: dialKeepAlive}).DialContext,
+		TLSHandshakeTimeout:   tlsHandshakeTimeout,
+		ResponseHeaderTimeout: responseHeaderTimeout,
+	}
+
+	connector := &binanceConnector{
+		id:       mmodel.DriverBinance,
+		provider: provider,
+		client: &http.Client{
+			Timeout:   requestTimeout,
+			Transport: transport,
+		},
+		base:   parsed.String(),
+		logger: logger.Named("binance"),
+	}
+
+	return connector, nil
+}
+
+func (c *binanceConnector) ID() mmodel.Driver {
+	return c.id
+}
+
+func (c *binanceConnector) FetchTicker(ctx context.Context, symbol string) (*mmodel.Ticker, error) {
+	if strings.TrimSpace(symbol) == "" {
+		return nil, fmerrors.New("binance: symbol is empty")
+	}
+
+	endpoint, err := url.Parse(c.base)
+	if err != nil {
+		return nil, fmerrors.Wrap("binance: parse base url", err)
+	}
+	endpoint.Path = "/api/v3/ticker/bookTicker"
+	query := endpoint.Query()
+	query.Set("symbol", strings.ToUpper(strings.TrimSpace(symbol)))
+	endpoint.RawQuery = query.Encode()
+
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, endpoint.String(), nil)
+	if err != nil {
+		return nil, fmerrors.Wrap("binance: build request", err)
+	}
+
+	resp, err := c.client.Do(req)
+	if err != nil {
+		c.logger.Warn("Binance request failed", zap.String("symbol", symbol), zap.Error(err))
+		return nil, fmerrors.Wrap("binance: request failed", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		c.logger.Warn("Binance returned non-OK status", zap.String("symbol", symbol), zap.Int("status", resp.StatusCode))
+		return nil, fmerrors.New("binance: unexpected status " + strconv.Itoa(resp.StatusCode))
+	}
+
+	var payload struct {
+		Symbol   string `json:"symbol"`
+		BidPrice string `json:"bidPrice"`
+		AskPrice string `json:"askPrice"`
+	}
+
+	if err := json.NewDecoder(resp.Body).Decode(&payload); err != nil {
+		c.logger.Warn("Binance decode failed", zap.String("symbol", symbol), zap.Error(err))
+		return nil, fmerrors.Wrap("binance: decode response", err)
+	}
+
+	return &mmodel.Ticker{
+		Symbol:    payload.Symbol,
+		BidPrice:  payload.BidPrice,
+		AskPrice:  payload.AskPrice,
+		Provider:  c.provider,
+		Timestamp: time.Now().UnixMilli(),
+	}, nil
+}

api/fx/ingestor/internal/market/coingecko/connector.go

@@ -0,0 +1,222 @@
+package coingecko
+
+import (
+	"context"
+	"encoding/json"
+	"net"
+	"net/http"
+	"net/url"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/tech/sendico/fx/ingestor/internal/fmerrors"
+	"github.com/tech/sendico/fx/ingestor/internal/market/common"
+	mmodel "github.com/tech/sendico/fx/ingestor/internal/model"
+	"github.com/tech/sendico/pkg/mlogger"
+	"github.com/tech/sendico/pkg/model"
+	"go.uber.org/zap"
+)
+
+type coingeckoConnector struct {
+	id       mmodel.Driver
+	provider string
+	client   *http.Client
+	base     string
+	logger   mlogger.Logger
+}
+
+const defaultCoinGeckoBaseURL = "https://api.coingecko.com/api/v3"
+
+const (
+	defaultDialTimeoutSeconds           = 5 * time.Second
+	defaultDialKeepAliveSeconds         = 30 * time.Second
+	defaultTLSHandshakeTimeoutSeconds   = 5 * time.Second
+	defaultResponseHeaderTimeoutSeconds = 10 * time.Second
+	defaultRequestTimeoutSeconds        = 10 * time.Second
+)
+
+func NewConnector(logger mlogger.Logger, settings model.SettingsT) (mmodel.Connector, error) {
+	baseURL := defaultCoinGeckoBaseURL
+	provider := strings.ToLower(mmodel.DriverCoinGecko.String())
+	dialTimeout := defaultDialTimeoutSeconds
+	dialKeepAlive := defaultDialKeepAliveSeconds
+	tlsHandshakeTimeout := defaultTLSHandshakeTimeoutSeconds
+	responseHeaderTimeout := defaultResponseHeaderTimeoutSeconds
+	requestTimeout := defaultRequestTimeoutSeconds
+
+	if settings != nil {
+		if value, ok := settings["base_url"].(string); ok && strings.TrimSpace(value) != "" {
+			baseURL = strings.TrimSpace(value)
+		}
+		if value, ok := settings["provider"].(string); ok && strings.TrimSpace(value) != "" {
+			provider = strings.TrimSpace(value)
+		}
+		dialTimeout = common.DurationSetting(settings, "dial_timeout_seconds", dialTimeout)
+		dialKeepAlive = common.DurationSetting(settings, "dial_keep_alive_seconds", dialKeepAlive)
+		tlsHandshakeTimeout = common.DurationSetting(settings, "tls_handshake_timeout_seconds", tlsHandshakeTimeout)
+		responseHeaderTimeout = common.DurationSetting(settings, "response_header_timeout_seconds", responseHeaderTimeout)
+		requestTimeout = common.DurationSetting(settings, "request_timeout_seconds", requestTimeout)
+	}
+
+	parsed, err := url.Parse(baseURL)
+	if err != nil {
+		return nil, fmerrors.Wrap("coingecko: invalid base url", err)
+	}
+
+	transport := &http.Transport{
+		DialContext:           (&net.Dialer{Timeout: dialTimeout, KeepAlive: dialKeepAlive}).DialContext,
+		TLSHandshakeTimeout:   tlsHandshakeTimeout,
+		ResponseHeaderTimeout: responseHeaderTimeout,
+	}
+
+	connector := &coingeckoConnector{
+		id:       mmodel.DriverCoinGecko,
+		provider: provider,
+		client: &http.Client{
+			Timeout:   requestTimeout,
+			Transport: transport,
+		},
+		base:   strings.TrimRight(parsed.String(), "/"),
+		logger: logger.Named("coingecko"),
+	}
+
+	return connector, nil
+}
+
+func (c *coingeckoConnector) ID() mmodel.Driver {
+	return c.id
+}
+
+func (c *coingeckoConnector) FetchTicker(ctx context.Context, symbol string) (*mmodel.Ticker, error) {
+	coinID, vsCurrency, err := parseSymbol(symbol)
+	if err != nil {
+		return nil, err
+	}
+
+	endpoint, err := url.Parse(c.base)
+	if err != nil {
+		return nil, fmerrors.Wrap("coingecko: parse base url", err)
+	}
+	endpoint.Path = strings.TrimRight(endpoint.Path, "/") + "/simple/price"
+	query := endpoint.Query()
+	query.Set("ids", coinID)
+	query.Set("vs_currencies", vsCurrency)
+	query.Set("include_last_updated_at", "true")
+	endpoint.RawQuery = query.Encode()
+
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, endpoint.String(), nil)
+	if err != nil {
+		return nil, fmerrors.Wrap("coingecko: build request", err)
+	}
+
+	resp, err := c.client.Do(req)
+	if err != nil {
+		c.logger.Warn("CoinGecko request failed", zap.String("symbol", symbol), zap.Error(err))
+		return nil, fmerrors.Wrap("coingecko: request failed", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		c.logger.Warn("CoinGecko returned non-OK status", zap.String("symbol", symbol), zap.Int("status", resp.StatusCode))
+		return nil, fmerrors.New("coingecko: unexpected status " + strconv.Itoa(resp.StatusCode))
+	}
+
+	decoder := json.NewDecoder(resp.Body)
+	decoder.UseNumber()
+
+	var payload map[string]map[string]interface{}
+	if err := decoder.Decode(&payload); err != nil {
+		c.logger.Warn("CoinGecko decode failed", zap.String("symbol", symbol), zap.Error(err))
+		return nil, fmerrors.Wrap("coingecko: decode response", err)
+	}
+
+	coinData, ok := payload[coinID]
+	if !ok {
+		return nil, fmerrors.New("coingecko: coin id not found in response")
+	}
+	priceValue, ok := coinData[vsCurrency]
+	if !ok {
+		return nil, fmerrors.New("coingecko: vs currency not found in response")
+	}
+
+	price, ok := toFloat(priceValue)
+	if !ok || price <= 0 {
+		return nil, fmerrors.New("coingecko: invalid price value in response")
+	}
+
+	priceStr := strconv.FormatFloat(price, 'f', -1, 64)
+
+	timestamp := time.Now().UnixMilli()
+	if tsValue, ok := coinData["last_updated_at"]; ok {
+		if tsFloat, ok := toFloat(tsValue); ok && tsFloat > 0 {
+			tsMillis := int64(tsFloat * 1000)
+			if tsMillis > 0 {
+				timestamp = tsMillis
+			}
+		}
+	}
+
+	refSymbol := coinID + "_" + vsCurrency
+
+	return &mmodel.Ticker{
+		Symbol:    refSymbol,
+		BidPrice:  priceStr,
+		AskPrice:  priceStr,
+		Provider:  c.provider,
+		Timestamp: timestamp,
+	}, nil
+}
+
+func parseSymbol(symbol string) (string, string, error) {
+	trimmed := strings.TrimSpace(symbol)
+	if trimmed == "" {
+		return "", "", fmerrors.New("coingecko: symbol is empty")
+	}
+
+	parts := strings.FieldsFunc(strings.ToLower(trimmed), func(r rune) bool {
+		switch r {
+		case ':', '/', '-', '_':
+			return true
+		}
+		return false
+	})
+
+	if len(parts) != 2 {
+		return "", "", fmerrors.New("coingecko: symbol must be <coin_id>/<vs_currency>")
+	}
+
+	coinID := strings.TrimSpace(parts[0])
+	vsCurrency := strings.TrimSpace(parts[1])
+	if coinID == "" || vsCurrency == "" {
+		return "", "", fmerrors.New("coingecko: symbol contains empty segments")
+	}
+
+	return coinID, vsCurrency, nil
+}
+
+func toFloat(value interface{}) (float64, bool) {
+	switch v := value.(type) {
+	case json.Number:
+		f, err := v.Float64()
+		if err != nil {
+			return 0, false
+		}
+		return f, true
+	case float64:
+		return v, true
+	case float32:
+		return float64(v), true
+	case int:
+		return float64(v), true
+	case int64:
+		return float64(v), true
+	case uint64:
+		return float64(v), true
+	case string:
+		if parsed, err := strconv.ParseFloat(v, 64); err == nil {
+			return parsed, true
+		}
+	}
+	return 0, false
+}

api/fx/ingestor/internal/market/common/settings.go

@@ -0,0 +1,46 @@
+package common
+
+import (
+	"strconv"
+	"time"
+
+	"github.com/tech/sendico/pkg/model"
+)
+
+// DurationSetting reads a positive duration override from settings or returns def when the value is missing or invalid.
+func DurationSetting(settings model.SettingsT, key string, def time.Duration) time.Duration {
+	if settings == nil {
+		return def
+	}
+	value, ok := settings[key]
+	if !ok {
+		return def
+	}
+
+	switch v := value.(type) {
+	case time.Duration:
+		if v > 0 {
+			return v
+		}
+	case int:
+		if v > 0 {
+			return time.Duration(v) * time.Second
+		}
+	case int64:
+		if v > 0 {
+			return time.Duration(v) * time.Second
+		}
+	case float64:
+		if v > 0 {
+			return time.Duration(v * float64(time.Second))
+		}
+	case string:
+		if parsed, err := time.ParseDuration(v); err == nil && parsed > 0 {
+			return parsed
+		}
+		if seconds, err := strconv.ParseFloat(v, 64); err == nil && seconds > 0 {
+			return time.Duration(seconds * float64(time.Second))
+		}
+	}
+	return def
+}

api/fx/ingestor/internal/market/factory.go

@@ -0,0 +1,55 @@
+package market
+
+import (
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/tech/sendico/fx/ingestor/internal/fmerrors"
+	"github.com/tech/sendico/fx/ingestor/internal/market/binance"
+	"github.com/tech/sendico/fx/ingestor/internal/market/coingecko"
+	mmodel "github.com/tech/sendico/fx/ingestor/internal/model"
+	"github.com/tech/sendico/pkg/mlogger"
+	"github.com/tech/sendico/pkg/model"
+)
+
+type ConnectorFactory func(logger mlogger.Logger, settings model.SettingsT) (mmodel.Connector, error)
+
+func BuildConnectors(logger mlogger.Logger, configs []model.DriverConfig[mmodel.Driver]) (map[mmodel.Driver]mmodel.Connector, error) {
+	connectors := make(map[mmodel.Driver]mmodel.Connector, len(configs))
+
+	for _, cfg := range configs {
+		driver := mmodel.NormalizeDriver(cfg.Driver)
+		if driver.IsEmpty() {
+			return nil, fmerrors.New("market: connector driver is empty")
+		}
+
+		var (
+			conn mmodel.Connector
+			err  error
+		)
+
+		switch driver {
+		case mmodel.DriverBinance:
+			conn, err = binance.NewConnector(logger, cfg.Settings)
+		case mmodel.DriverCoinGecko:
+			conn, err = coingecko.NewConnector(logger, cfg.Settings)
+		default:
+			err = fmerrors.New("market: unsupported driver " + driver.String())
+		}
+
+		if err != nil {
+			return nil, fmerrors.Wrap("market: build connector "+driver.String(), err)
+		}
+		connectors[driver] = conn
+	}
+
+	return connectors, nil
+}
+
+func BuildRateReference(provider, symbol string, now time.Time) string {
+	if strings.TrimSpace(provider) == "" {
+		provider = "unknown"
+	}
+	return provider + ":" + symbol + ":" + strconv.FormatInt(now.UnixMilli(), 10)
+}

api/fx/ingestor/internal/metrics/server.go

@@ -0,0 +1,134 @@
+package metrics
+
+import (
+	"context"
+	"errors"
+	"net/http"
+	"strings"
+	"time"
+
+	"github.com/go-chi/chi/v5"
+	"github.com/tech/sendico/fx/ingestor/internal/config"
+	"github.com/tech/sendico/fx/ingestor/internal/fmerrors"
+	"github.com/tech/sendico/pkg/api/routers"
+	"github.com/tech/sendico/pkg/api/routers/health"
+	"github.com/tech/sendico/pkg/mlogger"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
+	"go.uber.org/zap"
+)
+
+const (
+	defaultAddress        = ":9102"
+	readHeaderTimeout     = 5 * time.Second
+	defaultShutdownWindow = 5 * time.Second
+)
+
+type Server interface {
+	SetStatus(health.ServiceStatus)
+	Close(context.Context)
+}
+
+func NewServer(logger mlogger.Logger, cfg *config.MetricsConfig) (Server, error) {
+	if logger == nil {
+		return nil, fmerrors.New("metrics: logger is nil")
+	}
+	if cfg == nil || !cfg.Enabled {
+		logger.Debug("Metrics disabled; using noop server")
+		return noopServer{}, nil
+	}
+
+	address := strings.TrimSpace(cfg.Address)
+	if address == "" {
+		address = defaultAddress
+	}
+
+	metricsLogger := logger.Named("metrics")
+	router := chi.NewRouter()
+	router.Handle("/metrics", promhttp.Handler())
+
+	var healthRouter routers.Health
+	if hr, err := routers.NewHealthRouter(metricsLogger, router, ""); err != nil {
+		metricsLogger.Warn("Failed to initialise health router", zap.Error(err))
+	} else {
+		hr.SetStatus(health.SSStarting)
+		healthRouter = hr
+	}
+
+	httpServer := &http.Server{
+		Addr:              address,
+		Handler:           router,
+		ReadHeaderTimeout: readHeaderTimeout,
+	}
+
+	ms := &httpServerWrapper{
+		logger:  metricsLogger,
+		server:  httpServer,
+		health:  healthRouter,
+		timeout: defaultShutdownWindow,
+	}
+
+	go func() {
+		metricsLogger.Info("Prometheus endpoint listening", zap.String("address", address))
+		if err := httpServer.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
+			metricsLogger.Error("Prometheus endpoint stopped unexpectedly", zap.Error(err))
+			if healthRouter != nil {
+				healthRouter.SetStatus(health.SSTerminating)
+			}
+		}
+	}()
+
+	return ms, nil
+}
+
+type httpServerWrapper struct {
+	logger  mlogger.Logger
+	server  *http.Server
+	health  routers.Health
+	timeout time.Duration
+}
+
+func (s *httpServerWrapper) SetStatus(status health.ServiceStatus) {
+	if s == nil || s.health == nil {
+		return
+	}
+	s.logger.Debug("Updating metrics health status", zap.String("status", string(status)))
+	s.health.SetStatus(status)
+}
+
+func (s *httpServerWrapper) Close(ctx context.Context) {
+	if s == nil {
+		return
+	}
+
+	if s.health != nil {
+		s.health.SetStatus(health.SSTerminating)
+		s.health.Finish()
+		s.health = nil
+	}
+
+	if s.server == nil {
+		return
+	}
+
+	shutdownCtx := ctx
+	if shutdownCtx == nil {
+		shutdownCtx = context.Background()
+	}
+	if s.timeout > 0 {
+		var cancel context.CancelFunc
+		shutdownCtx, cancel = context.WithTimeout(shutdownCtx, s.timeout)
+		defer cancel()
+	}
+
+	if err := s.server.Shutdown(shutdownCtx); err != nil && !errors.Is(err, http.ErrServerClosed) {
+		s.logger.Warn("Failed to stop metrics server", zap.Error(err))
+	} else {
+		s.logger.Info("Metrics server stopped")
+	}
+}
+
+type noopServer struct{}
+
+func (noopServer) SetStatus(health.ServiceStatus) {}
+
+func (noopServer) Close(context.Context) {}

api/fx/ingestor/internal/model/connector.go

@@ -0,0 +1,30 @@
+package model
+
+import (
+	"context"
+	"strings"
+)
+
+type Driver string
+
+const (
+	DriverBinance   Driver = "BINANCE"
+	DriverCoinGecko Driver = "COINGECKO"
+)
+
+func (d Driver) String() string {
+	return string(d)
+}
+
+func (d Driver) IsEmpty() bool {
+	return strings.TrimSpace(string(d)) == ""
+}
+
+func NormalizeDriver(d Driver) Driver {
+	return Driver(strings.ToUpper(strings.TrimSpace(string(d))))
+}
+
+type Connector interface {
+	ID() Driver
+	FetchTicker(ctx context.Context, symbol string) (*Ticker, error)
+}

api/fx/ingestor/internal/model/ticker.go

@@ -0,0 +1,9 @@
+package model
+
+type Ticker struct {
+	Symbol    string
+	BidPrice  string
+	AskPrice  string
+	Provider  string
+	Timestamp int64
+}

api/fx/ingestor/internal/signalctx/signalctx.go

@@ -0,0 +1,14 @@
+package signalctx
+
+import (
+	"context"
+	"os"
+	"os/signal"
+)
+
+func WithSignals(parent context.Context, sig ...os.Signal) (context.Context, context.CancelFunc) {
+	if parent == nil {
+		parent = context.Background()
+	}
+	return signal.NotifyContext(parent, sig...)
+}

api/fx/ingestor/main.go

@@ -0,0 +1,55 @@
+package main
+
+import (
+	"context"
+	"errors"
+	"flag"
+	"fmt"
+	"os"
+	"syscall"
+
+	"github.com/tech/sendico/fx/ingestor/internal/app"
+	"github.com/tech/sendico/fx/ingestor/internal/appversion"
+	"github.com/tech/sendico/fx/ingestor/internal/signalctx"
+	lf "github.com/tech/sendico/pkg/mlogger/factory"
+	"go.uber.org/zap"
+)
+
+var (
+	configFile  = flag.String("config.file", app.DefaultConfigPath, "Path to the configuration file.")
+	debugFlag   = flag.Bool("debug", false, "Enable debug logging.")
+	versionFlag = flag.Bool("version", false, "Show version information.")
+)
+
+func main() {
+	flag.Parse()
+
+	logger := lf.NewLogger(*debugFlag).Named("fx_ingestor")
+	defer logger.Sync()
+
+	av := appversion.Create()
+	if *versionFlag {
+		fmt.Fprintln(os.Stdout, av.Print())
+		return
+	}
+
+	logger.Info(fmt.Sprintf("Starting %s", av.Program()), zap.String("version", av.Info()))
+
+	ctx, cancel := signalctx.WithSignals(context.Background(), os.Interrupt, syscall.SIGTERM)
+	defer cancel()
+
+	application, err := app.New(logger, *configFile)
+	if err != nil {
+		logger.Fatal("Failed to initialise application", zap.Error(err))
+	}
+
+	if err := application.Run(ctx); err != nil {
+		if errors.Is(err, context.Canceled) {
+			logger.Info("FX ingestor stopped")
+			return
+		}
+		logger.Fatal("Ingestor terminated with error", zap.Error(err))
+	}
+
+	logger.Info("FX ingestor stopped")
+}

api/fx/oracle/.air.toml

@@ -0,0 +1,32 @@
+# Config file for Air in TOML format
+
+root = "./../.."
+tmp_dir = "tmp"
+
+[build]
+cmd = "go build -o app -ldflags \"-X 'github.com/tech/sendico/fx/oracle/internal/appversion.BuildUser=$(whoami)' -X 'github.com/tech/sendico/fx/oracle/internal/appversion.Version=$APP_V' -X 'github.com/tech/sendico/fx/oracle/internal/appversion.Branch=$BUILD_BRANCH' -X 'github.com/tech/sendico/fx/oracle/internal/appversion.Revision=$GIT_REV' -X 'github.com/tech/sendico/fx/oracle/internal/appversion.BuildDate=$(date)'\""
+bin = "./app"
+full_bin = "./app --debug --config.file=config.yml"
+include_ext = ["go", "yaml", "yml"]
+exclude_dir = ["fx/oracle/tmp", "pkg/.git", "fx/oracle/env"]
+exclude_regex = ["_test\\.go"]
+exclude_unchanged = true
+follow_symlink = true
+log = "air.log"
+delay = 0
+stop_on_error = true
+send_interrupt = true
+kill_delay = 500
+args_bin = []
+
+[log]
+time = false
+
+[color]
+main = "magenta"
+watcher = "cyan"
+build = "yellow"
+runner = "green"
+
+[misc]
+clean_on_exit = true

api/fx/oracle/.gitignore

@@ -0,0 +1,3 @@
+internal/generated
+.gocache
+app

api/fx/oracle/client/client.go

@@ -0,0 +1,252 @@
+package client
+
+import (
+	"context"
+	"crypto/tls"
+	"fmt"
+	"strings"
+	"time"
+
+	"github.com/tech/sendico/pkg/merrors"
+	fxv1 "github.com/tech/sendico/pkg/proto/common/fx/v1"
+	moneyv1 "github.com/tech/sendico/pkg/proto/common/money/v1"
+	tracev1 "github.com/tech/sendico/pkg/proto/common/trace/v1"
+	oraclev1 "github.com/tech/sendico/pkg/proto/oracle/v1"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/credentials"
+	"google.golang.org/grpc/credentials/insecure"
+)
+
+// Client exposes typed helpers around the oracle gRPC API.
+type Client interface {
+	LatestRate(ctx context.Context, req LatestRateParams) (*RateSnapshot, error)
+	GetQuote(ctx context.Context, req GetQuoteParams) (*Quote, error)
+	Close() error
+}
+
+// RequestMeta carries optional multi-tenant context for oracle calls.
+type RequestMeta struct {
+	TenantRef       string
+	OrganizationRef string
+	Trace           *tracev1.TraceContext
+}
+
+type LatestRateParams struct {
+	Meta     RequestMeta
+	Pair     *fxv1.CurrencyPair
+	Provider string
+}
+
+type RateSnapshot struct {
+	Pair      *fxv1.CurrencyPair
+	Mid       string
+	Bid       string
+	Ask       string
+	SpreadBps string
+	Provider  string
+	RateRef   string
+	AsOf      time.Time
+}
+
+type GetQuoteParams struct {
+	Meta              RequestMeta
+	Pair              *fxv1.CurrencyPair
+	Side              fxv1.Side
+	BaseAmount        *moneyv1.Money
+	QuoteAmount       *moneyv1.Money
+	Firm              bool
+	TTL               time.Duration
+	PreferredProvider string
+	MaxAge            time.Duration
+}
+
+type Quote struct {
+	QuoteRef    string
+	Pair        *fxv1.CurrencyPair
+	Side        fxv1.Side
+	Price       string
+	BaseAmount  *moneyv1.Money
+	QuoteAmount *moneyv1.Money
+	ExpiresAt   time.Time
+	Provider    string
+	RateRef     string
+	Firm        bool
+}
+
+type grpcOracleClient interface {
+	GetQuote(ctx context.Context, in *oraclev1.GetQuoteRequest, opts ...grpc.CallOption) (*oraclev1.GetQuoteResponse, error)
+	LatestRate(ctx context.Context, in *oraclev1.LatestRateRequest, opts ...grpc.CallOption) (*oraclev1.LatestRateResponse, error)
+}
+
+type oracleClient struct {
+	cfg    Config
+	conn   *grpc.ClientConn
+	client grpcOracleClient
+}
+
+// New dials the oracle endpoint and returns a ready client.
+func New(ctx context.Context, cfg Config, opts ...grpc.DialOption) (Client, error) {
+	cfg.setDefaults()
+	if strings.TrimSpace(cfg.Address) == "" {
+		return nil, merrors.InvalidArgument("oracle: address is required")
+	}
+
+	dialCtx, cancel := context.WithTimeout(ctx, cfg.DialTimeout)
+	defer cancel()
+
+	dialOpts := make([]grpc.DialOption, 0, len(opts)+1)
+	dialOpts = append(dialOpts, opts...)
+
+	if cfg.Insecure {
+		dialOpts = append(dialOpts, grpc.WithTransportCredentials(insecure.NewCredentials()))
+	} else {
+		dialOpts = append(dialOpts, grpc.WithTransportCredentials(credentials.NewTLS(&tls.Config{})))
+	}
+
+	conn, err := grpc.DialContext(dialCtx, cfg.Address, dialOpts...)
+	if err != nil {
+		return nil, merrors.InternalWrap(err, fmt.Sprintf("oracle: dial %s", cfg.Address))
+	}
+
+	return &oracleClient{
+		cfg:    cfg,
+		conn:   conn,
+		client: oraclev1.NewOracleClient(conn),
+	}, nil
+}
+
+// NewWithClient injects a pre-built oracle client (useful for tests).
+func NewWithClient(cfg Config, oc grpcOracleClient) Client {
+	cfg.setDefaults()
+	return &oracleClient{
+		cfg:    cfg,
+		client: oc,
+	}
+}
+
+func (c *oracleClient) Close() error {
+	if c.conn != nil {
+		return c.conn.Close()
+	}
+	return nil
+}
+
+func (c *oracleClient) LatestRate(ctx context.Context, req LatestRateParams) (*RateSnapshot, error) {
+	if req.Pair == nil {
+		return nil, merrors.InvalidArgument("oracle: pair is required")
+	}
+
+	callCtx, cancel := c.callContext(ctx)
+	defer cancel()
+
+	resp, err := c.client.LatestRate(callCtx, &oraclev1.LatestRateRequest{
+		Meta:     toProtoMeta(req.Meta),
+		Pair:     req.Pair,
+		Provider: req.Provider,
+	})
+	if err != nil {
+		return nil, merrors.InternalWrap(err, "oracle: latest rate")
+	}
+	if resp.GetRate() == nil {
+		return nil, merrors.Internal("oracle: latest rate: empty payload")
+	}
+	return fromProtoRate(resp.GetRate()), nil
+}
+
+func (c *oracleClient) GetQuote(ctx context.Context, req GetQuoteParams) (*Quote, error) {
+	if req.Pair == nil {
+		return nil, merrors.InvalidArgument("oracle: pair is required")
+	}
+	if req.Side == fxv1.Side_SIDE_UNSPECIFIED {
+		return nil, merrors.InvalidArgument("oracle: side is required")
+	}
+
+	baseSupplied := req.BaseAmount != nil
+	quoteSupplied := req.QuoteAmount != nil
+	if baseSupplied == quoteSupplied {
+		return nil, merrors.InvalidArgument("oracle: exactly one of base_amount or quote_amount must be set")
+	}
+
+	callCtx, cancel := c.callContext(ctx)
+	defer cancel()
+
+	protoReq := &oraclev1.GetQuoteRequest{
+		Meta:              toProtoMeta(req.Meta),
+		Pair:              req.Pair,
+		Side:              req.Side,
+		Firm:              req.Firm,
+		PreferredProvider: req.PreferredProvider,
+	}
+	if req.TTL > 0 {
+		protoReq.TtlMs = req.TTL.Milliseconds()
+	}
+	if req.MaxAge > 0 {
+		protoReq.MaxAgeMs = int32(req.MaxAge.Milliseconds())
+	}
+	if baseSupplied {
+		protoReq.AmountInput = &oraclev1.GetQuoteRequest_BaseAmount{BaseAmount: req.BaseAmount}
+	} else {
+		protoReq.AmountInput = &oraclev1.GetQuoteRequest_QuoteAmount{QuoteAmount: req.QuoteAmount}
+	}
+
+	resp, err := c.client.GetQuote(callCtx, protoReq)
+	if err != nil {
+		return nil, merrors.InternalWrap(err, "oracle: get quote")
+	}
+	if resp.GetQuote() == nil {
+		return nil, merrors.Internal("oracle: get quote: empty payload")
+	}
+	return fromProtoQuote(resp.GetQuote()), nil
+}
+
+func (c *oracleClient) callContext(ctx context.Context) (context.Context, context.CancelFunc) {
+	if _, ok := ctx.Deadline(); ok {
+		return context.WithCancel(ctx)
+	}
+	return context.WithTimeout(ctx, c.cfg.CallTimeout)
+}
+
+func toProtoMeta(meta RequestMeta) *oraclev1.RequestMeta {
+	if meta.TenantRef == "" && meta.OrganizationRef == "" && meta.Trace == nil {
+		return nil
+	}
+	return &oraclev1.RequestMeta{
+		TenantRef:       meta.TenantRef,
+		OrganizationRef: meta.OrganizationRef,
+		Trace:           meta.Trace,
+	}
+}
+
+func fromProtoRate(rate *oraclev1.RateSnapshot) *RateSnapshot {
+	if rate == nil {
+		return nil
+	}
+	return &RateSnapshot{
+		Pair:      rate.Pair,
+		Mid:       rate.GetMid().GetValue(),
+		Bid:       rate.GetBid().GetValue(),
+		Ask:       rate.GetAsk().GetValue(),
+		SpreadBps: rate.GetSpreadBps().GetValue(),
+		Provider:  rate.GetProvider(),
+		RateRef:   rate.GetRateRef(),
+		AsOf:      time.UnixMilli(rate.GetAsofUnixMs()),
+	}
+}
+
+func fromProtoQuote(quote *oraclev1.Quote) *Quote {
+	if quote == nil {
+		return nil
+	}
+	return &Quote{
+		QuoteRef:    quote.GetQuoteRef(),
+		Pair:        quote.Pair,
+		Side:        quote.GetSide(),
+		Price:       quote.GetPrice().GetValue(),
+		BaseAmount:  quote.BaseAmount,
+		QuoteAmount: quote.QuoteAmount,
+		ExpiresAt:   time.UnixMilli(quote.GetExpiresAtUnixMs()),
+		Provider:    quote.GetProvider(),
+		RateRef:     quote.GetRateRef(),
+		Firm:        quote.GetFirm(),
+	}
+}

api/fx/oracle/client/client_test.go

@@ -0,0 +1,116 @@
+package client
+
+import (
+	"context"
+	"testing"
+	"time"
+
+	fxv1 "github.com/tech/sendico/pkg/proto/common/fx/v1"
+	moneyv1 "github.com/tech/sendico/pkg/proto/common/money/v1"
+	oraclev1 "github.com/tech/sendico/pkg/proto/oracle/v1"
+	"google.golang.org/grpc"
+)
+
+type stubOracle struct {
+	latestResp *oraclev1.LatestRateResponse
+	latestErr  error
+
+	quoteResp *oraclev1.GetQuoteResponse
+	quoteErr  error
+
+	lastLatest *oraclev1.LatestRateRequest
+	lastQuote  *oraclev1.GetQuoteRequest
+}
+
+func (s *stubOracle) LatestRate(ctx context.Context, in *oraclev1.LatestRateRequest, _ ...grpc.CallOption) (*oraclev1.LatestRateResponse, error) {
+	s.lastLatest = in
+	return s.latestResp, s.latestErr
+}
+
+func (s *stubOracle) GetQuote(ctx context.Context, in *oraclev1.GetQuoteRequest, _ ...grpc.CallOption) (*oraclev1.GetQuoteResponse, error) {
+	s.lastQuote = in
+	return s.quoteResp, s.quoteErr
+}
+
+func TestLatestRate(t *testing.T) {
+	expectedTime := time.Date(2024, 1, 1, 15, 0, 0, 0, time.UTC)
+	stub := &stubOracle{
+		latestResp: &oraclev1.LatestRateResponse{
+			Rate: &oraclev1.RateSnapshot{
+				Pair:       &fxv1.CurrencyPair{Base: "USD", Quote: "EUR"},
+				Mid:        &moneyv1.Decimal{Value: "1.1000"},
+				Bid:        &moneyv1.Decimal{Value: "1.0995"},
+				Ask:        &moneyv1.Decimal{Value: "1.1005"},
+				SpreadBps:  &moneyv1.Decimal{Value: "5"},
+				Provider:   "ECB",
+				RateRef:    "ECB-20240101",
+				AsofUnixMs: expectedTime.UnixMilli(),
+			},
+		},
+	}
+
+	client := NewWithClient(Config{}, stub)
+	resp, err := client.LatestRate(context.Background(), LatestRateParams{
+		Meta: RequestMeta{
+			TenantRef:       "tenant",
+			OrganizationRef: "org",
+		},
+		Pair:     &fxv1.CurrencyPair{Base: "USD", Quote: "EUR"},
+		Provider: "ECB",
+	})
+	if err != nil {
+		t.Fatalf("LatestRate returned error: %v", err)
+	}
+
+	if stub.lastLatest.GetProvider() != "ECB" {
+		t.Fatalf("expected provider to propagate, got %s", stub.lastLatest.GetProvider())
+	}
+	if resp.Provider != "ECB" || resp.RateRef != "ECB-20240101" {
+		t.Fatalf("unexpected response: %+v", resp)
+	}
+	if !resp.AsOf.Equal(expectedTime) {
+		t.Fatalf("expected as-of %s, got %s", expectedTime, resp.AsOf)
+	}
+}
+
+func TestGetQuote(t *testing.T) {
+	expiresAt := time.Date(2024, 2, 2, 12, 0, 0, 0, time.UTC)
+	stub := &stubOracle{
+		quoteResp: &oraclev1.GetQuoteResponse{
+			Quote: &oraclev1.Quote{
+				QuoteRef:        "quote-123",
+				Pair:            &fxv1.CurrencyPair{Base: "GBP", Quote: "USD"},
+				Side:            fxv1.Side_BUY_BASE_SELL_QUOTE,
+				Price:           &moneyv1.Decimal{Value: "1.2500"},
+				BaseAmount:      &moneyv1.Money{Amount: "100.00", Currency: "GBP"},
+				QuoteAmount:     &moneyv1.Money{Amount: "125.00", Currency: "USD"},
+				ExpiresAtUnixMs: expiresAt.UnixMilli(),
+				Provider:        "Test",
+				RateRef:         "test-ref",
+				Firm:            true,
+			},
+		},
+	}
+
+	client := NewWithClient(Config{}, stub)
+	resp, err := client.GetQuote(context.Background(), GetQuoteParams{
+		Pair:       &fxv1.CurrencyPair{Base: "GBP", Quote: "USD"},
+		Side:       fxv1.Side_BUY_BASE_SELL_QUOTE,
+		BaseAmount: &moneyv1.Money{Amount: "100.00", Currency: "GBP"},
+		Firm:       true,
+		TTL:        2 * time.Second,
+	})
+	if err != nil {
+		t.Fatalf("GetQuote returned error: %v", err)
+	}
+
+	if stub.lastQuote.GetFirm() != true {
+		t.Fatalf("expected firm flag to propagate")
+	}
+	if stub.lastQuote.GetTtlMs() == 0 {
+		t.Fatalf("expected ttl to be populated")
+	}
+	if resp.QuoteRef != "quote-123" || resp.Price != "1.2500" || !resp.ExpiresAt.Equal(expiresAt) {
+		t.Fatalf("unexpected quote response: %+v", resp)
+	}
+}

api/fx/oracle/client/config.go

@@ -0,0 +1,20 @@
+package client
+
+import "time"
+
+// Config captures connection settings for the FX oracle gRPC service.
+type Config struct {
+	Address     string
+	DialTimeout time.Duration
+	CallTimeout time.Duration
+	Insecure    bool
+}
+
+func (c *Config) setDefaults() {
+	if c.DialTimeout <= 0 {
+		c.DialTimeout = 5 * time.Second
+	}
+	if c.CallTimeout <= 0 {
+		c.CallTimeout = 3 * time.Second
+	}
+}

api/fx/oracle/client/fake.go

@@ -0,0 +1,60 @@
+package client
+
+import (
+	"context"
+
+	fxv1 "github.com/tech/sendico/pkg/proto/common/fx/v1"
+	moneyv1 "github.com/tech/sendico/pkg/proto/common/money/v1"
+)
+
+// Fake implements Client for tests.
+type Fake struct {
+	LatestRateFn func(ctx context.Context, req LatestRateParams) (*RateSnapshot, error)
+	GetQuoteFn   func(ctx context.Context, req GetQuoteParams) (*Quote, error)
+	CloseFn      func() error
+}
+
+func (f *Fake) LatestRate(ctx context.Context, req LatestRateParams) (*RateSnapshot, error) {
+	if f.LatestRateFn != nil {
+		return f.LatestRateFn(ctx, req)
+	}
+	return &RateSnapshot{
+		Pair:      &fxv1.CurrencyPair{Base: "USD", Quote: "EUR"},
+		Mid:       "1.1000",
+		Bid:       "1.0995",
+		Ask:       "1.1005",
+		SpreadBps: "5",
+		Provider:  "fake",
+		RateRef:   "fake",
+	}, nil
+}
+
+func (f *Fake) GetQuote(ctx context.Context, req GetQuoteParams) (*Quote, error) {
+	if f.GetQuoteFn != nil {
+		return f.GetQuoteFn(ctx, req)
+	}
+	return &Quote{
+		QuoteRef: "fake-quote",
+		Pair:     req.Pair,
+		Side:     req.Side,
+		Price:    "1.1000",
+		BaseAmount: &moneyv1.Money{
+			Amount:   "100.00",
+			Currency: req.Pair.GetBase(),
+		},
+		QuoteAmount: &moneyv1.Money{
+			Amount:   "110.00",
+			Currency: req.Pair.GetQuote(),
+		},
+		Provider: "fake",
+		RateRef:  "fake",
+		Firm:     req.Firm,
+	}, nil
+}
+
+func (f *Fake) Close() error {
+	if f.CloseFn != nil {
+		return f.CloseFn()
+	}
+	return nil
+}

api/fx/oracle/config.yml

@@ -0,0 +1,34 @@
+runtime:
+  shutdown_timeout_seconds: 15
+
+grpc:
+  network: tcp
+  address: ":50051"
+  enable_reflection: true
+  enable_health: true
+
+metrics:
+  address: ":9400"
+
+database:
+  driver: mongodb
+  settings:
+    host_env: FX_MONGO_HOST
+    port_env: FX_MONGO_PORT
+    database_env: FX_MONGO_DATABASE
+    user_env: FX_MONGO_USER
+    password_env: FX_MONGO_PASSWORD
+    auth_source_env: FX_MONGO_AUTH_SOURCE
+    replica_set_env: FX_MONGO_REPLICA_SET
+
+messaging:
+  driver: NATS
+  settings:
+    url_env: NATS_URL
+    host_env: NATS_HOST
+    port_env: NATS_PORT
+    username_env: NATS_USER
+    password_env: NATS_PASSWORD
+    broker_name: FX Oracle
+    max_reconnects: 10
+    reconnect_wait: 5

api/fx/oracle/env/.gitignore

@@ -0,0 +1 @@
+.env.api

api/fx/oracle/go.mod

@@ -0,0 +1,54 @@
+module github.com/tech/sendico/fx/oracle
+
+go 1.25.3
+
+replace github.com/tech/sendico/pkg => ../../pkg
+
+replace github.com/tech/sendico/fx/storage => ../storage
+
+require (
+	github.com/google/uuid v1.6.0
+	github.com/prometheus/client_golang v1.23.2
+	github.com/tech/sendico/fx/storage v0.0.0
+	github.com/tech/sendico/pkg v0.1.0
+	go.mongodb.org/mongo-driver v1.17.6
+	go.uber.org/zap v1.27.1
+	google.golang.org/grpc v1.77.0
+	google.golang.org/protobuf v1.36.10
+	gopkg.in/yaml.v3 v3.0.1
+)
+
+require (
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/bmatcuk/doublestar/v4 v4.9.1 // indirect
+	github.com/casbin/casbin/v2 v2.134.0 // indirect
+	github.com/casbin/govaluate v1.10.0 // indirect
+	github.com/casbin/mongodb-adapter/v3 v3.7.0 // indirect
+	github.com/cespare/xxhash/v2 v2.3.0 // indirect
+	github.com/go-chi/chi/v5 v5.2.3 // indirect
+	github.com/golang/snappy v1.0.0 // indirect
+	github.com/klauspost/compress v1.18.2 // indirect
+	github.com/mattn/go-colorable v0.1.14 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/mitchellh/mapstructure v1.5.0 // indirect
+	github.com/montanaflynn/stats v0.7.1 // indirect
+	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
+	github.com/nats-io/nats.go v1.47.0 // indirect
+	github.com/nats-io/nkeys v0.4.12 // indirect
+	github.com/nats-io/nuid v1.0.1 // indirect
+	github.com/prometheus/client_model v0.6.2 // indirect
+	github.com/prometheus/common v0.67.4 // indirect
+	github.com/prometheus/procfs v0.19.2 // indirect
+	github.com/xdg-go/pbkdf2 v1.0.0 // indirect
+	github.com/xdg-go/scram v1.2.0 // indirect
+	github.com/xdg-go/stringprep v1.0.4 // indirect
+	github.com/youmark/pkcs8 v0.0.0-20240726163527-a2c0da244d78 // indirect
+	go.uber.org/multierr v1.11.0 // indirect
+	go.yaml.in/yaml/v2 v2.4.3 // indirect
+	golang.org/x/crypto v0.45.0 // indirect
+	golang.org/x/net v0.47.0 // indirect
+	golang.org/x/sync v0.18.0 // indirect
+	golang.org/x/sys v0.38.0 // indirect
+	golang.org/x/text v0.31.0 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20251202230838-ff82c1b0f217 // indirect
+)

api/fx/oracle/go.sum

@@ -0,0 +1,225 @@
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+github.com/Microsoft/go-winio v0.6.2 h1:F2VQgta7ecxGYO8k3ZZz3RS8fVIXVxONVUPlNERoyfY=
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+golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=
+golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+gonum.org/v1/gonum v0.16.0 h1:5+ul4Swaf3ESvrOnidPp4GZbzf0mxVQpDCYUQE7OJfk=
+gonum.org/v1/gonum v0.16.0/go.mod h1:fef3am4MQ93R2HHpKnLk4/Tbh/s0+wqD5nfa6Pnwy4E=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20251202230838-ff82c1b0f217 h1:gRkg/vSppuSQoDjxyiGfN4Upv/h/DQmIR10ZU8dh4Ww=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20251202230838-ff82c1b0f217/go.mod h1:7i2o+ce6H/6BluujYR+kqX3GKH+dChPTQU19wjRPiGk=
+google.golang.org/grpc v1.77.0 h1:wVVY6/8cGA6vvffn+wWK5ToddbgdU3d8MNENr4evgXM=
+google.golang.org/grpc v1.77.0/go.mod h1:z0BY1iVj0q8E1uSQCjL9cppRj+gnZjzDnzV0dHhrNig=
+google.golang.org/protobuf v1.36.10 h1:AYd7cD/uASjIL6Q9LiTjz8JLcrh/88q5UObnmY3aOOE=
+google.golang.org/protobuf v1.36.10/go.mod h1:HTf+CrKn2C3g5S8VImy6tdcUvCska2kB7j23XfzDpco=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
+gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

api/fx/oracle/internal/appversion/version.go

@@ -0,0 +1,27 @@
+package appversion
+
+import (
+	"github.com/tech/sendico/pkg/version"
+	vf "github.com/tech/sendico/pkg/version/factory"
+)
+
+// Build information. Populated at build-time.
+var (
+	Version   string
+	Revision  string
+	Branch    string
+	BuildUser string
+	BuildDate string
+)
+
+func Create() version.Printer {
+	vi := version.Info{
+		Program:   "Sendico FX Oracle Service",
+		Revision:  Revision,
+		Branch:    Branch,
+		BuildUser: BuildUser,
+		BuildDate: BuildDate,
+		Version:   Version,
+	}
+	return vf.Create(&vi)
+}

api/fx/oracle/internal/server/internal/serverimp.go

@@ -0,0 +1,101 @@
+package serverimp
+
+import (
+	"context"
+	"os"
+	"time"
+
+	"github.com/tech/sendico/fx/oracle/internal/service/oracle"
+	"github.com/tech/sendico/fx/storage"
+	mongostorage "github.com/tech/sendico/fx/storage/mongo"
+	"github.com/tech/sendico/pkg/api/routers"
+	"github.com/tech/sendico/pkg/db"
+	msg "github.com/tech/sendico/pkg/messaging"
+	"github.com/tech/sendico/pkg/mlogger"
+	"github.com/tech/sendico/pkg/server/grpcapp"
+	"go.uber.org/zap"
+	"gopkg.in/yaml.v3"
+)
+
+type Imp struct {
+	logger mlogger.Logger
+	file   string
+	debug  bool
+
+	config *grpcapp.Config
+	app    *grpcapp.App[storage.Repository]
+}
+
+func Create(logger mlogger.Logger, file string, debug bool) (*Imp, error) {
+	return &Imp{
+		logger: logger.Named("server"),
+		file:   file,
+		debug:  debug,
+	}, nil
+}
+
+func (i *Imp) Shutdown() {
+	if i.app == nil {
+		return
+	}
+	timeout := 15 * time.Second
+	if i.config != nil && i.config.Runtime != nil {
+		timeout = i.config.Runtime.ShutdownTimeout()
+	}
+	ctx, cancel := context.WithTimeout(context.Background(), timeout)
+	i.app.Shutdown(ctx)
+	cancel()
+}
+
+func (i *Imp) Start() error {
+	cfg, err := i.loadConfig()
+	if err != nil {
+		return err
+	}
+	i.config = cfg
+
+	repoFactory := func(logger mlogger.Logger, conn *db.MongoConnection) (storage.Repository, error) {
+		return mongostorage.New(logger, conn)
+	}
+
+	serviceFactory := func(logger mlogger.Logger, repo storage.Repository, producer msg.Producer) (grpcapp.Service, error) {
+		return oracle.NewService(logger, repo, producer), nil
+	}
+
+	app, err := grpcapp.NewApp(i.logger, "fx_oracle", cfg, i.debug, repoFactory, serviceFactory)
+	if err != nil {
+		return err
+	}
+	i.app = app
+
+	return i.app.Start()
+}
+
+func (i *Imp) loadConfig() (*grpcapp.Config, error) {
+	data, err := os.ReadFile(i.file)
+	if err != nil {
+		i.logger.Error("Could not read configuration file", zap.String("config_file", i.file), zap.Error(err))
+		return nil, err
+	}
+
+	cfg := &grpcapp.Config{}
+	if err := yaml.Unmarshal(data, cfg); err != nil {
+		i.logger.Error("Failed to parse configuration", zap.Error(err))
+		return nil, err
+	}
+
+	if cfg.Runtime == nil {
+		cfg.Runtime = &grpcapp.RuntimeConfig{ShutdownTimeoutSeconds: 15}
+	}
+
+	if cfg.GRPC == nil {
+		cfg.GRPC = &routers.GRPCConfig{
+			Network:          "tcp",
+			Address:          ":50051",
+			EnableReflection: true,
+			EnableHealth:     true,
+		}
+	}
+
+	return cfg, nil
+}

api/fx/oracle/internal/server/server.go

@@ -0,0 +1,11 @@
+package server
+
+import (
+	serverimp "github.com/tech/sendico/fx/oracle/internal/server/internal"
+	"github.com/tech/sendico/pkg/mlogger"
+	"github.com/tech/sendico/pkg/server"
+)
+
+func Create(logger mlogger.Logger, file string, debug bool) (server.Application, error) {
+	return serverimp.Create(logger, file, debug)
+}

api/fx/oracle/internal/service/oracle/calculator.go

@@ -0,0 +1,223 @@
+package oracle
+
+import (
+	"math/big"
+	"strings"
+	"time"
+
+	"github.com/google/uuid"
+	"github.com/tech/sendico/fx/storage/model"
+	"github.com/tech/sendico/pkg/merrors"
+	fxv1 "github.com/tech/sendico/pkg/proto/common/fx/v1"
+	moneyv1 "github.com/tech/sendico/pkg/proto/common/money/v1"
+	tracev1 "github.com/tech/sendico/pkg/proto/common/trace/v1"
+	oraclev1 "github.com/tech/sendico/pkg/proto/oracle/v1"
+	"go.mongodb.org/mongo-driver/bson/primitive"
+)
+
+type quoteComputation struct {
+	pair         *model.Pair
+	rate         *model.RateSnapshot
+	sideProto    fxv1.Side
+	sideModel    model.QuoteSide
+	price        *big.Rat
+	baseInput    *big.Rat
+	quoteInput   *big.Rat
+	amountType   model.QuoteAmountType
+	baseRounded  *big.Rat
+	quoteRounded *big.Rat
+	priceRounded *big.Rat
+	baseScale    uint32
+	quoteScale   uint32
+	priceScale   uint32
+	provider     string
+}
+
+func newQuoteComputation(pair *model.Pair, rate *model.RateSnapshot, side fxv1.Side, provider string) (*quoteComputation, error) {
+	if pair == nil || rate == nil {
+		return nil, merrors.InvalidArgument("oracle: missing pair or rate")
+	}
+	sideModel := protoSideToModel(side)
+	if sideModel == "" {
+		return nil, merrors.InvalidArgument("oracle: unsupported side")
+	}
+	price, err := priceFromRate(rate, side)
+	if err != nil {
+		return nil, err
+	}
+	if strings.TrimSpace(provider) == "" {
+		provider = rate.Provider
+	}
+	return &quoteComputation{
+		pair:       pair,
+		rate:       rate,
+		sideProto:  side,
+		sideModel:  sideModel,
+		price:      price,
+		baseScale:  pair.BaseMeta.Decimals,
+		quoteScale: pair.QuoteMeta.Decimals,
+		priceScale: pair.QuoteMeta.Decimals,
+		provider:   provider,
+	}, nil
+}
+
+func (qc *quoteComputation) withBaseInput(m *moneyv1.Money) error {
+	if m == nil {
+		return merrors.InvalidArgument("oracle: base amount missing")
+	}
+	if !strings.EqualFold(m.GetCurrency(), qc.pair.Pair.Base) {
+		return merrors.InvalidArgument("oracle: base amount currency mismatch")
+	}
+	val, err := ratFromString(m.GetAmount())
+	if err != nil {
+		return err
+	}
+	qc.baseInput = val
+	qc.amountType = model.QuoteAmountTypeBase
+	return nil
+}
+
+func (qc *quoteComputation) withQuoteInput(m *moneyv1.Money) error {
+	if m == nil {
+		return merrors.InvalidArgument("oracle: quote amount missing")
+	}
+	if !strings.EqualFold(m.GetCurrency(), qc.pair.Pair.Quote) {
+		return merrors.InvalidArgument("oracle: quote amount currency mismatch")
+	}
+	val, err := ratFromString(m.GetAmount())
+	if err != nil {
+		return err
+	}
+	qc.quoteInput = val
+	qc.amountType = model.QuoteAmountTypeQuote
+	return nil
+}
+
+func (qc *quoteComputation) compute() error {
+	var baseRaw, quoteRaw *big.Rat
+	switch qc.amountType {
+	case model.QuoteAmountTypeBase:
+		baseRaw = qc.baseInput
+		quoteRaw = mulRat(qc.baseInput, qc.price)
+	case model.QuoteAmountTypeQuote:
+		quoteRaw = qc.quoteInput
+		base, err := divRat(qc.quoteInput, qc.price)
+		if err != nil {
+			return err
+		}
+		baseRaw = base
+	default:
+		return merrors.InvalidArgument("oracle: amount type not set")
+	}
+
+	var err error
+	qc.baseRounded, err = roundRatToScale(baseRaw, qc.baseScale, qc.pair.BaseMeta.Rounding)
+	if err != nil {
+		return err
+	}
+	qc.quoteRounded, err = roundRatToScale(quoteRaw, qc.quoteScale, qc.pair.QuoteMeta.Rounding)
+	if err != nil {
+		return err
+	}
+	qc.priceRounded, err = roundRatToScale(qc.price, qc.priceScale, qc.pair.QuoteMeta.Rounding)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func (qc *quoteComputation) buildModelQuote(firm bool, expiryMillis int64, req *oraclev1.GetQuoteRequest) (*model.Quote, error) {
+	if qc.baseRounded == nil || qc.quoteRounded == nil || qc.priceRounded == nil {
+		return nil, merrors.Internal("oracle: computation not executed")
+	}
+
+	quote := &model.Quote{
+		QuoteRef: uuid.NewString(),
+		Firm:     firm,
+		Status:   model.QuoteStatusIssued,
+		Pair:     qc.pair.Pair,
+		Side:     qc.sideModel,
+		Price:    formatRat(qc.priceRounded, qc.priceScale),
+		BaseAmount: model.Money{
+			Currency: qc.pair.Pair.Base,
+			Amount:   formatRat(qc.baseRounded, qc.baseScale),
+		},
+		QuoteAmount: model.Money{
+			Currency: qc.pair.Pair.Quote,
+			Amount:   formatRat(qc.quoteRounded, qc.quoteScale),
+		},
+		AmountType:        qc.amountType,
+		RateRef:           qc.rate.RateRef,
+		Provider:          qc.provider,
+		PreferredProvider: req.GetPreferredProvider(),
+		RequestedTTLMs:    req.GetTtlMs(),
+		MaxAgeToleranceMs: int64(req.GetMaxAgeMs()),
+		Meta:              buildQuoteMeta(req.GetMeta()),
+	}
+
+	if firm {
+		quote.ExpiresAtUnixMs = expiryMillis
+		expiry := time.UnixMilli(expiryMillis)
+		quote.ExpiresAt = &expiry
+	}
+
+	return quote, nil
+}
+
+func buildQuoteMeta(meta *oraclev1.RequestMeta) *model.QuoteMeta {
+	if meta == nil {
+		return nil
+	}
+	trace := meta.GetTrace()
+	qm := &model.QuoteMeta{
+		RequestRef:     deriveRequestRef(meta, trace),
+		TenantRef:      meta.GetTenantRef(),
+		TraceRef:       deriveTraceRef(meta, trace),
+		IdempotencyKey: deriveIdempotencyKey(meta, trace),
+	}
+	if org := strings.TrimSpace(meta.GetOrganizationRef()); org != "" {
+		if objID, err := primitive.ObjectIDFromHex(org); err == nil {
+			qm.SetOrganizationRef(objID)
+		}
+	}
+	return qm
+}
+
+func protoSideToModel(side fxv1.Side) model.QuoteSide {
+	switch side {
+	case fxv1.Side_BUY_BASE_SELL_QUOTE:
+		return model.QuoteSideBuyBaseSellQuote
+	case fxv1.Side_SELL_BASE_BUY_QUOTE:
+		return model.QuoteSideSellBaseBuyQuote
+	default:
+		return ""
+	}
+}
+
+func computeExpiry(now time.Time, ttlMs int64) (int64, error) {
+	if ttlMs <= 0 {
+		return 0, merrors.InvalidArgument("oracle: ttl must be positive")
+	}
+	return now.Add(time.Duration(ttlMs) * time.Millisecond).UnixMilli(), nil
+}
+
+func deriveRequestRef(meta *oraclev1.RequestMeta, trace *tracev1.TraceContext) string {
+	if trace != nil && trace.GetRequestRef() != "" {
+		return trace.GetRequestRef()
+	}
+	return meta.GetRequestRef()
+}
+
+func deriveTraceRef(meta *oraclev1.RequestMeta, trace *tracev1.TraceContext) string {
+	if trace != nil && trace.GetTraceRef() != "" {
+		return trace.GetTraceRef()
+	}
+	return meta.GetTraceRef()
+}
+
+func deriveIdempotencyKey(meta *oraclev1.RequestMeta, trace *tracev1.TraceContext) string {
+	if trace != nil && trace.GetIdempotencyKey() != "" {
+		return trace.GetIdempotencyKey()
+	}
+	return meta.GetIdempotencyKey()
+}

api/fx/oracle/internal/service/oracle/cross.go

@@ -0,0 +1,221 @@
+package oracle
+
+import (
+	"context"
+	"fmt"
+	"math/big"
+	"strings"
+	"time"
+
+	"github.com/tech/sendico/fx/storage/model"
+	"github.com/tech/sendico/pkg/merrors"
+)
+
+type priceSet struct {
+	bid *big.Rat
+	ask *big.Rat
+	mid *big.Rat
+}
+
+func (s *Service) computeCrossRate(ctx context.Context, pair *model.Pair, provider string) (*model.RateSnapshot, error) {
+	if pair == nil || pair.Cross == nil || !pair.Cross.Enabled {
+		return nil, merrors.ErrNoData
+	}
+
+	baseSnap, err := s.fetchCrossLegSnapshot(ctx, pair.Cross.BaseLeg, provider)
+	if err != nil {
+		return nil, err
+	}
+	quoteSnap, err := s.fetchCrossLegSnapshot(ctx, pair.Cross.QuoteLeg, provider)
+	if err != nil {
+		return nil, err
+	}
+
+	basePrices, err := buildPriceSet(baseSnap)
+	if err != nil {
+		return nil, err
+	}
+	quotePrices, err := buildPriceSet(quoteSnap)
+	if err != nil {
+		return nil, err
+	}
+
+	if pair.Cross.BaseLeg.Invert {
+		basePrices, err = invertPriceSet(basePrices)
+		if err != nil {
+			return nil, err
+		}
+	}
+	if pair.Cross.QuoteLeg.Invert {
+		quotePrices, err = invertPriceSet(quotePrices)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	result := multiplyPriceSets(basePrices, quotePrices)
+	if result.ask.Cmp(result.bid) < 0 {
+		result.ask, result.bid = result.bid, result.ask
+	}
+
+	spread := calcSpreadBps(result)
+
+	asOfMs := minNonZero(baseSnap.AsOfUnixMs, quoteSnap.AsOfUnixMs)
+	if asOfMs == 0 {
+		asOfMs = time.Now().UnixMilli()
+	}
+	asOf := time.UnixMilli(asOfMs)
+
+	rateRef := fmt.Sprintf("cross|%s/%s|%s|%s+%s", pair.Pair.Base, pair.Pair.Quote, provider, baseSnap.RateRef, quoteSnap.RateRef)
+
+	return &model.RateSnapshot{
+		RateRef:     rateRef,
+		Pair:        pair.Pair,
+		Provider:    provider,
+		Mid:         formatPrice(result.mid),
+		Bid:         formatPrice(result.bid),
+		Ask:         formatPrice(result.ask),
+		SpreadBps:   formatPrice(spread),
+		AsOfUnixMs:  asOfMs,
+		AsOf:        &asOf,
+		Source:      "cross_rate",
+		ProviderRef: rateRef,
+	}, nil
+}
+
+func (s *Service) fetchCrossLegSnapshot(ctx context.Context, leg model.CrossRateLeg, fallbackProvider string) (*model.RateSnapshot, error) {
+	provider := fallbackProvider
+	if strings.TrimSpace(leg.Provider) != "" {
+		provider = leg.Provider
+	}
+	if provider == "" {
+		return nil, merrors.InvalidArgument("oracle: cross leg provider missing")
+	}
+	return s.storage.Rates().LatestSnapshot(ctx, leg.Pair, provider)
+}
+
+func buildPriceSet(rate *model.RateSnapshot) (priceSet, error) {
+	if rate == nil {
+		return priceSet{}, merrors.InvalidArgument("oracle: cross rate requires underlying snapshot")
+	}
+	ask, err := parsePrice(rate.Ask)
+	if err != nil {
+		return priceSet{}, err
+	}
+	bid, err := parsePrice(rate.Bid)
+	if err != nil {
+		return priceSet{}, err
+	}
+	mid, err := parsePrice(rate.Mid)
+	if err != nil {
+		return priceSet{}, err
+	}
+
+	if ask == nil && bid == nil {
+		if mid == nil {
+			return priceSet{}, merrors.InvalidArgument("oracle: cross rate snapshot missing price data")
+		}
+		ask = new(big.Rat).Set(mid)
+		bid = new(big.Rat).Set(mid)
+	}
+	if ask == nil && mid != nil {
+		ask = new(big.Rat).Set(mid)
+	}
+	if bid == nil && mid != nil {
+		bid = new(big.Rat).Set(mid)
+	}
+	if ask == nil || bid == nil {
+		return priceSet{}, merrors.InvalidArgument("oracle: cross rate snapshot missing bid/ask data")
+	}
+
+	ps := priceSet{
+		bid: new(big.Rat).Set(bid),
+		ask: new(big.Rat).Set(ask),
+		mid: averageOrMid(bid, ask, mid),
+	}
+	if ps.ask.Cmp(ps.bid) < 0 {
+		ps.ask, ps.bid = ps.bid, ps.ask
+	}
+	return ps, nil
+}
+
+func parsePrice(value string) (*big.Rat, error) {
+	if strings.TrimSpace(value) == "" {
+		return nil, nil
+	}
+	return ratFromString(value)
+}
+
+func averageOrMid(bid, ask, mid *big.Rat) *big.Rat {
+	if mid != nil {
+		return new(big.Rat).Set(mid)
+	}
+	sum := new(big.Rat).Add(bid, ask)
+	return sum.Quo(sum, big.NewRat(2, 1))
+}
+
+func invertPriceSet(ps priceSet) (priceSet, error) {
+	if ps.ask.Sign() == 0 || ps.bid.Sign() == 0 {
+		return priceSet{}, merrors.InvalidArgument("oracle: cannot invert zero price")
+	}
+	one := big.NewRat(1, 1)
+	invBid := new(big.Rat).Quo(one, ps.ask)
+	invAsk := new(big.Rat).Quo(one, ps.bid)
+	var invMid *big.Rat
+	if ps.mid != nil && ps.mid.Sign() != 0 {
+		invMid = new(big.Rat).Quo(one, ps.mid)
+	} else {
+		invMid = averageOrMid(invBid, invAsk, nil)
+	}
+	result := priceSet{
+		bid: invBid,
+		ask: invAsk,
+		mid: invMid,
+	}
+	if result.ask.Cmp(result.bid) < 0 {
+		result.ask, result.bid = result.bid, result.ask
+	}
+	return result, nil
+}
+
+func multiplyPriceSets(a, b priceSet) priceSet {
+	result := priceSet{
+		bid: mulRat(a.bid, b.bid),
+		ask: mulRat(a.ask, b.ask),
+	}
+	result.mid = averageOrMid(result.bid, result.ask, nil)
+	return result
+}
+
+func calcSpreadBps(ps priceSet) *big.Rat {
+	if ps.mid == nil || ps.mid.Sign() == 0 {
+		return nil
+	}
+	spread := new(big.Rat).Sub(ps.ask, ps.bid)
+	if spread.Sign() < 0 {
+		spread.Neg(spread)
+	}
+	spread.Quo(spread, ps.mid)
+	spread.Mul(spread, big.NewRat(10000, 1))
+	return spread
+}
+
+func minNonZero(values ...int64) int64 {
+	var result int64
+	for _, v := range values {
+		if v <= 0 {
+			continue
+		}
+		if result == 0 || v < result {
+			result = v
+		}
+	}
+	return result
+}
+
+func formatPrice(r *big.Rat) string {
+	if r == nil {
+		return ""
+	}
+	return r.FloatString(8)
+}

api/fx/oracle/internal/service/oracle/math.go

@@ -0,0 +1,67 @@
+package oracle
+
+import (
+	"math/big"
+	"strings"
+	"time"
+
+	"github.com/tech/sendico/fx/storage/model"
+	"github.com/tech/sendico/pkg/decimal"
+	"github.com/tech/sendico/pkg/merrors"
+	fxv1 "github.com/tech/sendico/pkg/proto/common/fx/v1"
+)
+
+// Convenience aliases to pkg/decimal for backward compatibility
+var (
+	ratFromString = decimal.RatFromString
+	mulRat        = decimal.MulRat
+	divRat        = decimal.DivRat
+	formatRat     = decimal.FormatRat
+)
+
+// roundRatToScale wraps pkg/decimal.RoundRatToScale with model RoundingMode conversion
+func roundRatToScale(value *big.Rat, scale uint32, mode model.RoundingMode) (*big.Rat, error) {
+	return decimal.RoundRatToScale(value, scale, convertRoundingMode(mode))
+}
+
+// convertRoundingMode converts fx/storage model.RoundingMode to pkg/decimal.RoundingMode
+func convertRoundingMode(mode model.RoundingMode) decimal.RoundingMode {
+	switch mode {
+	case model.RoundingModeHalfEven:
+		return decimal.RoundingModeHalfEven
+	case model.RoundingModeHalfUp:
+		return decimal.RoundingModeHalfUp
+	case model.RoundingModeDown:
+		return decimal.RoundingModeDown
+	case model.RoundingModeUnspecified:
+		return decimal.RoundingModeUnspecified
+	default:
+		return decimal.RoundingModeHalfEven
+	}
+}
+
+func priceFromRate(rate *model.RateSnapshot, side fxv1.Side) (*big.Rat, error) {
+	var priceStr string
+	switch side {
+	case fxv1.Side_BUY_BASE_SELL_QUOTE:
+		priceStr = rate.Ask
+	case fxv1.Side_SELL_BASE_BUY_QUOTE:
+		priceStr = rate.Bid
+	default:
+		priceStr = ""
+	}
+
+	if strings.TrimSpace(priceStr) == "" {
+		priceStr = rate.Mid
+	}
+
+	if strings.TrimSpace(priceStr) == "" {
+		return nil, merrors.InvalidArgument("oracle: rate snapshot missing price")
+	}
+
+	return ratFromString(priceStr)
+}
+
+func timeFromUnixMilli(ms int64) time.Time {
+	return time.Unix(0, ms*int64(time.Millisecond))
+}

api/fx/oracle/internal/service/oracle/metrics.go

@@ -0,0 +1,65 @@
+package oracle
+
+import (
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promauto"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
+)
+
+var (
+	metricsOnce sync.Once
+
+	rpcRequestsTotal *prometheus.CounterVec
+	rpcLatency       *prometheus.HistogramVec
+)
+
+func initMetrics() {
+	metricsOnce.Do(func() {
+		rpcRequestsTotal = promauto.NewCounterVec(
+			prometheus.CounterOpts{
+				Namespace: "fx",
+				Subsystem: "oracle",
+				Name:      "requests_total",
+				Help:      "Total number of FX oracle RPC calls handled.",
+			},
+			[]string{"method", "result"},
+		)
+
+		rpcLatency = promauto.NewHistogramVec(
+			prometheus.HistogramOpts{
+				Namespace: "fx",
+				Subsystem: "oracle",
+				Name:      "request_latency_seconds",
+				Help:      "Latency of FX oracle RPC calls.",
+				Buckets:   prometheus.DefBuckets,
+			},
+			[]string{"method", "result"},
+		)
+	})
+}
+
+func observeRPC(start time.Time, method string, err error) {
+	result := labelFromError(err)
+	rpcRequestsTotal.WithLabelValues(method, result).Inc()
+	rpcLatency.WithLabelValues(method, result).Observe(time.Since(start).Seconds())
+}
+
+func labelFromError(err error) string {
+	if err == nil {
+		return strings.ToLower(codes.OK.String())
+	}
+	st, ok := status.FromError(err)
+	if !ok {
+		return "error"
+	}
+	code := st.Code()
+	if code == codes.OK {
+		return strings.ToLower(code.String())
+	}
+	return strings.ToLower(code.String())
+}

api/fx/oracle/internal/service/oracle/service.go

@@ -0,0 +1,402 @@
+package oracle
+
+import (
+	"context"
+	"errors"
+	"strings"
+	"time"
+
+	"github.com/tech/sendico/fx/storage"
+	"github.com/tech/sendico/fx/storage/model"
+	"github.com/tech/sendico/pkg/api/routers"
+	"github.com/tech/sendico/pkg/api/routers/gsresponse"
+	"github.com/tech/sendico/pkg/merrors"
+	pmessaging "github.com/tech/sendico/pkg/messaging"
+	"github.com/tech/sendico/pkg/mlogger"
+	"github.com/tech/sendico/pkg/mservice"
+	fxv1 "github.com/tech/sendico/pkg/proto/common/fx/v1"
+	oraclev1 "github.com/tech/sendico/pkg/proto/oracle/v1"
+	"go.uber.org/zap"
+	"google.golang.org/grpc"
+)
+
+type serviceError string
+
+func (e serviceError) Error() string {
+	return string(e)
+}
+
+var (
+	errSideRequired             = serviceError("oracle: side is required")
+	errAmountsMutuallyExclusive = serviceError("oracle: exactly one amount must be provided")
+	errAmountRequired           = serviceError("oracle: amount is required")
+	errQuoteRefRequired         = serviceError("oracle: quote_ref is required")
+	errEmptyRequest             = serviceError("oracle: request payload is empty")
+	errLedgerTxnRefRequired     = serviceError("oracle: ledger_txn_ref is required")
+)
+
+type Service struct {
+	logger   mlogger.Logger
+	storage  storage.Repository
+	producer pmessaging.Producer
+	oraclev1.UnimplementedOracleServer
+}
+
+func NewService(logger mlogger.Logger, repo storage.Repository, prod pmessaging.Producer) *Service {
+	initMetrics()
+	return &Service{
+		logger:   logger.Named("oracle"),
+		storage:  repo,
+		producer: prod,
+	}
+}
+
+func (s *Service) Register(router routers.GRPC) error {
+	return router.Register(func(reg grpc.ServiceRegistrar) {
+		oraclev1.RegisterOracleServer(reg, s)
+	})
+}
+
+func (s *Service) GetQuote(ctx context.Context, req *oraclev1.GetQuoteRequest) (*oraclev1.GetQuoteResponse, error) {
+	start := time.Now()
+	responder := s.getQuoteResponder(ctx, req)
+	resp, err := responder(ctx)
+	observeRPC(start, "GetQuote", err)
+	return resp, err
+}
+
+func (s *Service) ValidateQuote(ctx context.Context, req *oraclev1.ValidateQuoteRequest) (*oraclev1.ValidateQuoteResponse, error) {
+	start := time.Now()
+	responder := s.validateQuoteResponder(ctx, req)
+	resp, err := responder(ctx)
+	observeRPC(start, "ValidateQuote", err)
+	return resp, err
+}
+
+func (s *Service) ConsumeQuote(ctx context.Context, req *oraclev1.ConsumeQuoteRequest) (*oraclev1.ConsumeQuoteResponse, error) {
+	start := time.Now()
+	responder := s.consumeQuoteResponder(ctx, req)
+	resp, err := responder(ctx)
+	observeRPC(start, "ConsumeQuote", err)
+	return resp, err
+}
+
+func (s *Service) LatestRate(ctx context.Context, req *oraclev1.LatestRateRequest) (*oraclev1.LatestRateResponse, error) {
+	start := time.Now()
+	responder := s.latestRateResponder(ctx, req)
+	resp, err := responder(ctx)
+	observeRPC(start, "LatestRate", err)
+	return resp, err
+}
+
+func (s *Service) ListPairs(ctx context.Context, req *oraclev1.ListPairsRequest) (*oraclev1.ListPairsResponse, error) {
+	start := time.Now()
+	responder := s.listPairsResponder(ctx, req)
+	resp, err := responder(ctx)
+	observeRPC(start, "ListPairs", err)
+	return resp, err
+}
+
+func (s *Service) getQuoteResponder(ctx context.Context, req *oraclev1.GetQuoteRequest) gsresponse.Responder[oraclev1.GetQuoteResponse] {
+	if req == nil {
+		req = &oraclev1.GetQuoteRequest{}
+	}
+	s.logger.Debug("Handling GetQuote", zap.String("pair", req.GetPair().GetBase()+"/"+req.GetPair().GetQuote()), zap.Bool("firm", req.GetFirm()))
+	if req.GetSide() == fxv1.Side_SIDE_UNSPECIFIED {
+		return gsresponse.InvalidArgument[oraclev1.GetQuoteResponse](s.logger, mservice.FXOracle, errSideRequired)
+	}
+	if req.GetBaseAmount() != nil && req.GetQuoteAmount() != nil {
+		return gsresponse.InvalidArgument[oraclev1.GetQuoteResponse](s.logger, mservice.FXOracle, errAmountsMutuallyExclusive)
+	}
+	if req.GetBaseAmount() == nil && req.GetQuoteAmount() == nil {
+		return gsresponse.InvalidArgument[oraclev1.GetQuoteResponse](s.logger, mservice.FXOracle, errAmountRequired)
+	}
+	if err := s.pingStorage(ctx); err != nil {
+		s.logger.Warn("Storage unavailable during GetQuote", zap.Error(err))
+		return gsresponse.Unavailable[oraclev1.GetQuoteResponse](s.logger, mservice.FXOracle, err)
+	}
+	pairMsg := req.GetPair()
+	if pairMsg == nil || strings.TrimSpace(pairMsg.GetBase()) == "" || strings.TrimSpace(pairMsg.GetQuote()) == "" {
+		return gsresponse.InvalidArgument[oraclev1.GetQuoteResponse](s.logger, mservice.FXOracle, errEmptyRequest)
+	}
+	pairKey := model.CurrencyPair{Base: strings.ToUpper(pairMsg.GetBase()), Quote: strings.ToUpper(pairMsg.GetQuote())}
+
+	pair, err := s.storage.Pairs().Get(ctx, pairKey)
+	if err != nil {
+		switch {
+		case errors.Is(err, merrors.ErrNoData):
+			return gsresponse.InvalidArgument[oraclev1.GetQuoteResponse](s.logger, mservice.FXOracle, merrors.InvalidArgument("pair_not_supported"))
+		default:
+			return gsresponse.Internal[oraclev1.GetQuoteResponse](s.logger, mservice.FXOracle, err)
+		}
+	}
+
+	provider := req.GetPreferredProvider()
+	if provider == "" {
+		provider = pair.DefaultProvider
+	}
+	if provider == "" && len(pair.Providers) > 0 {
+		provider = pair.Providers[0]
+	}
+
+	rate, err := s.getLatestRate(ctx, pair, provider)
+	if err != nil {
+		switch {
+		case errors.Is(err, merrors.ErrNoData):
+			return gsresponse.FailedPrecondition[oraclev1.GetQuoteResponse](s.logger, mservice.FXOracle, "rate_not_found", err)
+		default:
+			return gsresponse.Internal[oraclev1.GetQuoteResponse](s.logger, mservice.FXOracle, err)
+		}
+	}
+
+	now := time.Now()
+	if maxAge := req.GetMaxAgeMs(); maxAge > 0 {
+		age := now.UnixMilli() - rate.AsOfUnixMs
+		if age > int64(maxAge) {
+			s.logger.Warn("Rate snapshot stale", zap.Int64("age_ms", age), zap.Int32("max_age_ms", req.GetMaxAgeMs()), zap.String("pair", pairKey.Base+"/"+pairKey.Quote), zap.String("provider", provider))
+			return gsresponse.FailedPrecondition[oraclev1.GetQuoteResponse](s.logger, mservice.FXOracle, "stale_rate", merrors.InvalidArgument("rate older than allowed window"))
+		}
+	}
+
+	comp, err := newQuoteComputation(pair, rate, req.GetSide(), provider)
+	if err != nil {
+		return gsresponse.InvalidArgument[oraclev1.GetQuoteResponse](s.logger, mservice.FXOracle, err)
+	}
+
+	if req.GetBaseAmount() != nil {
+		if err := comp.withBaseInput(req.GetBaseAmount()); err != nil {
+			return gsresponse.InvalidArgument[oraclev1.GetQuoteResponse](s.logger, mservice.FXOracle, err)
+		}
+	} else if req.GetQuoteAmount() != nil {
+		if err := comp.withQuoteInput(req.GetQuoteAmount()); err != nil {
+			return gsresponse.InvalidArgument[oraclev1.GetQuoteResponse](s.logger, mservice.FXOracle, err)
+		}
+	}
+
+	if err := comp.compute(); err != nil {
+		return gsresponse.Internal[oraclev1.GetQuoteResponse](s.logger, mservice.FXOracle, err)
+	}
+
+	expiresAt := int64(0)
+	if req.GetFirm() {
+		expiry, err := computeExpiry(now, req.GetTtlMs())
+		if err != nil {
+			return gsresponse.InvalidArgument[oraclev1.GetQuoteResponse](s.logger, mservice.FXOracle, err)
+		}
+		expiresAt = expiry
+	}
+
+	quoteModel, err := comp.buildModelQuote(req.GetFirm(), expiresAt, req)
+	if err != nil {
+		return gsresponse.Internal[oraclev1.GetQuoteResponse](s.logger, mservice.FXOracle, err)
+	}
+
+	if req.GetFirm() {
+		if err := s.storage.Quotes().Issue(ctx, quoteModel); err != nil {
+			switch {
+			case errors.Is(err, merrors.ErrDataConflict):
+				return gsresponse.Conflict[oraclev1.GetQuoteResponse](s.logger, mservice.FXOracle, err)
+			default:
+				return gsresponse.Internal[oraclev1.GetQuoteResponse](s.logger, mservice.FXOracle, err)
+			}
+		}
+		s.logger.Info("Firm quote stored", zap.String("quote_ref", quoteModel.QuoteRef), zap.String("pair", pairKey.Base+"/"+pairKey.Quote), zap.String("provider", quoteModel.Provider), zap.Int64("expires_at_ms", quoteModel.ExpiresAtUnixMs))
+	}
+
+	resp := &oraclev1.GetQuoteResponse{
+		Meta:  buildResponseMeta(req.GetMeta()),
+		Quote: quoteModelToProto(quoteModel),
+	}
+	return gsresponse.Success(resp)
+}
+
+func (s *Service) validateQuoteResponder(ctx context.Context, req *oraclev1.ValidateQuoteRequest) gsresponse.Responder[oraclev1.ValidateQuoteResponse] {
+	if req == nil {
+		req = &oraclev1.ValidateQuoteRequest{}
+	}
+	s.logger.Debug("Handling ValidateQuote", zap.String("quote_ref", req.GetQuoteRef()))
+	if req.GetQuoteRef() == "" {
+		return gsresponse.InvalidArgument[oraclev1.ValidateQuoteResponse](s.logger, mservice.FXOracle, errQuoteRefRequired)
+	}
+	if err := s.pingStorage(ctx); err != nil {
+		s.logger.Warn("Storage unavailable during ValidateQuote", zap.Error(err))
+		return gsresponse.Unavailable[oraclev1.ValidateQuoteResponse](s.logger, mservice.FXOracle, err)
+	}
+	quote, err := s.storage.Quotes().GetByRef(ctx, req.GetQuoteRef())
+	if err != nil {
+		switch {
+		case errors.Is(err, merrors.ErrNoData):
+			resp := &oraclev1.ValidateQuoteResponse{
+				Meta:   buildResponseMeta(req.GetMeta()),
+				Quote:  nil,
+				Valid:  false,
+				Reason: "not_found",
+			}
+			return gsresponse.Success(resp)
+		default:
+			return gsresponse.Internal[oraclev1.ValidateQuoteResponse](s.logger, mservice.FXOracle, err)
+		}
+	}
+
+	now := time.Now()
+	valid := true
+	reason := ""
+	if quote.IsExpired(now) {
+		valid = false
+		reason = "expired"
+	} else if quote.Status == model.QuoteStatusConsumed {
+		valid = false
+		reason = "consumed"
+	}
+
+	resp := &oraclev1.ValidateQuoteResponse{
+		Meta:   buildResponseMeta(req.GetMeta()),
+		Quote:  quoteModelToProto(quote),
+		Valid:  valid,
+		Reason: reason,
+	}
+	return gsresponse.Success(resp)
+}
+
+func (s *Service) consumeQuoteResponder(ctx context.Context, req *oraclev1.ConsumeQuoteRequest) gsresponse.Responder[oraclev1.ConsumeQuoteResponse] {
+	if req == nil {
+		req = &oraclev1.ConsumeQuoteRequest{}
+	}
+	s.logger.Debug("Handling ConsumeQuote", zap.String("quote_ref", req.GetQuoteRef()), zap.String("ledger_txn_ref", req.GetLedgerTxnRef()))
+	if req.GetQuoteRef() == "" {
+		return gsresponse.InvalidArgument[oraclev1.ConsumeQuoteResponse](s.logger, mservice.FXOracle, errQuoteRefRequired)
+	}
+	if req.GetLedgerTxnRef() == "" {
+		return gsresponse.InvalidArgument[oraclev1.ConsumeQuoteResponse](s.logger, mservice.FXOracle, errLedgerTxnRefRequired)
+	}
+	if err := s.pingStorage(ctx); err != nil {
+		s.logger.Warn("Storage unavailable during ConsumeQuote", zap.Error(err))
+		return gsresponse.Unavailable[oraclev1.ConsumeQuoteResponse](s.logger, mservice.FXOracle, err)
+	}
+	_, err := s.storage.Quotes().Consume(ctx, req.GetQuoteRef(), req.GetLedgerTxnRef(), time.Now())
+	if err != nil {
+		switch {
+		case errors.Is(err, storage.ErrQuoteExpired):
+			return gsresponse.FailedPrecondition[oraclev1.ConsumeQuoteResponse](s.logger, mservice.FXOracle, "expired", err)
+		case errors.Is(err, storage.ErrQuoteConsumed):
+			return gsresponse.FailedPrecondition[oraclev1.ConsumeQuoteResponse](s.logger, mservice.FXOracle, "consumed", err)
+		case errors.Is(err, storage.ErrQuoteNotFirm):
+			return gsresponse.FailedPrecondition[oraclev1.ConsumeQuoteResponse](s.logger, mservice.FXOracle, "not_firm", err)
+		case errors.Is(err, merrors.ErrNoData):
+			return gsresponse.NotFound[oraclev1.ConsumeQuoteResponse](s.logger, mservice.FXOracle, err)
+		default:
+			return gsresponse.Internal[oraclev1.ConsumeQuoteResponse](s.logger, mservice.FXOracle, err)
+		}
+	}
+
+	resp := &oraclev1.ConsumeQuoteResponse{
+		Meta:     buildResponseMeta(req.GetMeta()),
+		Consumed: true,
+		Reason:   "consumed",
+	}
+	s.logger.Debug("Quote consumed", zap.String("quote_ref", req.GetQuoteRef()), zap.String("ledger_txn_ref", req.GetLedgerTxnRef()))
+	return gsresponse.Success(resp)
+}
+
+func (s *Service) latestRateResponder(ctx context.Context, req *oraclev1.LatestRateRequest) gsresponse.Responder[oraclev1.LatestRateResponse] {
+	if req == nil {
+		req = &oraclev1.LatestRateRequest{}
+	}
+	s.logger.Debug("Handling LatestRate", zap.String("pair", req.GetPair().GetBase()+"/"+req.GetPair().GetQuote()))
+	if err := s.pingStorage(ctx); err != nil {
+		s.logger.Warn("Storage unavailable during LatestRate", zap.Error(err))
+		return gsresponse.Unavailable[oraclev1.LatestRateResponse](s.logger, mservice.FXOracle, err)
+	}
+	pairMsg := req.GetPair()
+	if pairMsg == nil || strings.TrimSpace(pairMsg.GetBase()) == "" || strings.TrimSpace(pairMsg.GetQuote()) == "" {
+		return gsresponse.InvalidArgument[oraclev1.LatestRateResponse](s.logger, mservice.FXOracle, errEmptyRequest)
+	}
+	pair := model.CurrencyPair{Base: strings.ToUpper(pairMsg.GetBase()), Quote: strings.ToUpper(pairMsg.GetQuote())}
+
+	pairMeta, err := s.storage.Pairs().Get(ctx, pair)
+	if err != nil {
+		switch {
+		case errors.Is(err, merrors.ErrNoData):
+			return gsresponse.NotFound[oraclev1.LatestRateResponse](s.logger, mservice.FXOracle, err)
+		default:
+			return gsresponse.Internal[oraclev1.LatestRateResponse](s.logger, mservice.FXOracle, err)
+		}
+	}
+
+	provider := req.GetProvider()
+	if provider == "" {
+		provider = pairMeta.DefaultProvider
+	}
+	if provider == "" && len(pairMeta.Providers) > 0 {
+		provider = pairMeta.Providers[0]
+	}
+
+	rate, err := s.getLatestRate(ctx, pairMeta, provider)
+	if err != nil {
+		switch {
+		case errors.Is(err, merrors.ErrNoData):
+			return gsresponse.NotFound[oraclev1.LatestRateResponse](s.logger, mservice.FXOracle, err)
+		default:
+			return gsresponse.Internal[oraclev1.LatestRateResponse](s.logger, mservice.FXOracle, err)
+		}
+	}
+
+	resp := &oraclev1.LatestRateResponse{
+		Meta: buildResponseMeta(req.GetMeta()),
+		Rate: rateModelToProto(rate),
+	}
+	return gsresponse.Success(resp)
+}
+
+func (s *Service) listPairsResponder(ctx context.Context, req *oraclev1.ListPairsRequest) gsresponse.Responder[oraclev1.ListPairsResponse] {
+	if req == nil {
+		req = &oraclev1.ListPairsRequest{}
+	}
+	s.logger.Debug("Handling ListPairs")
+	if err := s.pingStorage(ctx); err != nil {
+		s.logger.Warn("Storage unavailable during ListPairs", zap.Error(err))
+		return gsresponse.Unavailable[oraclev1.ListPairsResponse](s.logger, mservice.FXOracle, err)
+	}
+	pairs, err := s.storage.Pairs().ListEnabled(ctx)
+	if err != nil {
+		return gsresponse.Internal[oraclev1.ListPairsResponse](s.logger, mservice.FXOracle, err)
+	}
+	result := make([]*oraclev1.PairMeta, 0, len(pairs))
+	for _, pair := range pairs {
+		result = append(result, pairModelToProto(pair))
+	}
+	resp := &oraclev1.ListPairsResponse{
+		Meta:  buildResponseMeta(req.GetMeta()),
+		Pairs: result,
+	}
+	s.logger.Debug("ListPairs returning metadata", zap.Int("pairs", len(resp.GetPairs())))
+	return gsresponse.Success(resp)
+}
+
+func (s *Service) pingStorage(ctx context.Context) error {
+	if s.storage == nil {
+		return nil
+	}
+	return s.storage.Ping(ctx)
+}
+
+func (s *Service) getLatestRate(ctx context.Context, pair *model.Pair, provider string) (*model.RateSnapshot, error) {
+	rate, err := s.storage.Rates().LatestSnapshot(ctx, pair.Pair, provider)
+	if err == nil {
+		return rate, nil
+	}
+	if !errors.Is(err, merrors.ErrNoData) {
+		return nil, err
+	}
+	crossRate, crossErr := s.computeCrossRate(ctx, pair, provider)
+	if crossErr != nil {
+		if errors.Is(crossErr, merrors.ErrNoData) {
+			return nil, err
+		}
+		return nil, crossErr
+	}
+	s.logger.Debug("Derived cross rate", zap.String("pair", pair.Pair.Base+"/"+pair.Pair.Quote), zap.String("provider", provider))
+	return crossRate, nil
+}
+
+var _ oraclev1.OracleServer = (*Service)(nil)

api/fx/oracle/internal/service/oracle/service_test.go

@@ -0,0 +1,467 @@
+package oracle
+
+import (
+	"context"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/tech/sendico/fx/storage"
+	"github.com/tech/sendico/fx/storage/model"
+	"github.com/tech/sendico/pkg/merrors"
+	fxv1 "github.com/tech/sendico/pkg/proto/common/fx/v1"
+	moneyv1 "github.com/tech/sendico/pkg/proto/common/money/v1"
+	tracev1 "github.com/tech/sendico/pkg/proto/common/trace/v1"
+	oraclev1 "github.com/tech/sendico/pkg/proto/oracle/v1"
+	"go.uber.org/zap"
+)
+
+type repositoryStub struct {
+	rates      storage.RatesStore
+	quotes     storage.QuotesStore
+	pairs      storage.PairStore
+	currencies storage.CurrencyStore
+	pingErr    error
+}
+
+func (r *repositoryStub) Ping(ctx context.Context) error { return r.pingErr }
+func (r *repositoryStub) Rates() storage.RatesStore      { return r.rates }
+func (r *repositoryStub) Quotes() storage.QuotesStore    { return r.quotes }
+func (r *repositoryStub) Pairs() storage.PairStore       { return r.pairs }
+func (r *repositoryStub) Currencies() storage.CurrencyStore {
+	return r.currencies
+}
+
+type ratesStoreStub struct {
+	latestFn func(ctx context.Context, pair model.CurrencyPair, provider string) (*model.RateSnapshot, error)
+}
+
+func (r *ratesStoreStub) UpsertSnapshot(ctx context.Context, snapshot *model.RateSnapshot) error {
+	return nil
+}
+
+func (r *ratesStoreStub) LatestSnapshot(ctx context.Context, pair model.CurrencyPair, provider string) (*model.RateSnapshot, error) {
+	if r.latestFn != nil {
+		return r.latestFn(ctx, pair, provider)
+	}
+	return nil, merrors.ErrNoData
+}
+
+type quotesStoreStub struct {
+	issueFn   func(ctx context.Context, quote *model.Quote) error
+	getFn     func(ctx context.Context, ref string) (*model.Quote, error)
+	consumeFn func(ctx context.Context, ref, ledger string, when time.Time) (*model.Quote, error)
+}
+
+func (q *quotesStoreStub) Issue(ctx context.Context, quote *model.Quote) error {
+	if q.issueFn != nil {
+		return q.issueFn(ctx, quote)
+	}
+	return nil
+}
+
+func (q *quotesStoreStub) GetByRef(ctx context.Context, ref string) (*model.Quote, error) {
+	if q.getFn != nil {
+		return q.getFn(ctx, ref)
+	}
+	return nil, merrors.ErrNoData
+}
+
+func (q *quotesStoreStub) Consume(ctx context.Context, ref, ledger string, when time.Time) (*model.Quote, error) {
+	if q.consumeFn != nil {
+		return q.consumeFn(ctx, ref, ledger, when)
+	}
+	return nil, nil
+}
+
+func (q *quotesStoreStub) ExpireIssuedBefore(ctx context.Context, cutoff time.Time) (int, error) {
+	return 0, nil
+}
+
+type pairStoreStub struct {
+	getFn  func(ctx context.Context, pair model.CurrencyPair) (*model.Pair, error)
+	listFn func(ctx context.Context) ([]*model.Pair, error)
+}
+
+func (p *pairStoreStub) ListEnabled(ctx context.Context) ([]*model.Pair, error) {
+	if p.listFn != nil {
+		return p.listFn(ctx)
+	}
+	return nil, nil
+}
+
+func (p *pairStoreStub) Get(ctx context.Context, pair model.CurrencyPair) (*model.Pair, error) {
+	if p.getFn != nil {
+		return p.getFn(ctx, pair)
+	}
+	return nil, merrors.ErrNoData
+}
+
+func (p *pairStoreStub) Upsert(ctx context.Context, pair *model.Pair) error { return nil }
+
+type currencyStoreStub struct{}
+
+func (currencyStoreStub) Get(ctx context.Context, code string) (*model.Currency, error) {
+	return nil, merrors.ErrNoData
+}
+func (currencyStoreStub) List(ctx context.Context, codes ...string) ([]*model.Currency, error) {
+	return nil, nil
+}
+func (currencyStoreStub) Upsert(ctx context.Context, currency *model.Currency) error { return nil }
+
+func TestServiceGetQuoteFirm(t *testing.T) {
+	repo := &repositoryStub{}
+	repo.pairs = &pairStoreStub{
+		getFn: func(ctx context.Context, pair model.CurrencyPair) (*model.Pair, error) {
+			return &model.Pair{
+				Pair:      pair,
+				BaseMeta:  model.CurrencySettings{Code: pair.Base, Decimals: 2, Rounding: model.RoundingModeHalfEven},
+				QuoteMeta: model.CurrencySettings{Code: pair.Quote, Decimals: 2, Rounding: model.RoundingModeHalfEven},
+			}, nil
+		},
+	}
+	repo.rates = &ratesStoreStub{
+		latestFn: func(ctx context.Context, pair model.CurrencyPair, provider string) (*model.RateSnapshot, error) {
+			return &model.RateSnapshot{
+				Pair:       pair,
+				Provider:   provider,
+				Ask:        "1.10",
+				Bid:        "1.08",
+				RateRef:    "rate#1",
+				AsOfUnixMs: time.Now().UnixMilli(),
+			}, nil
+		},
+	}
+	savedQuote := &model.Quote{}
+	repo.quotes = &quotesStoreStub{
+		issueFn: func(ctx context.Context, quote *model.Quote) error {
+			*savedQuote = *quote
+			return nil
+		},
+	}
+	repo.currencies = currencyStoreStub{}
+
+	svc := NewService(zap.NewNop(), repo, nil)
+
+	req := &oraclev1.GetQuoteRequest{
+		Meta: &oraclev1.RequestMeta{
+			TenantRef: "tenant",
+			Trace:     &tracev1.TraceContext{RequestRef: "req"},
+		},
+		Pair: &fxv1.CurrencyPair{Base: "USD", Quote: "EUR"},
+		Side: fxv1.Side_BUY_BASE_SELL_QUOTE,
+		AmountInput: &oraclev1.GetQuoteRequest_BaseAmount{BaseAmount: &moneyv1.Money{
+			Currency: "USD",
+			Amount:   "100",
+		}},
+		Firm:  true,
+		TtlMs: 60000,
+	}
+
+	resp, err := svc.GetQuote(context.Background(), req)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if resp.GetQuote().GetFirm() != true {
+		t.Fatalf("expected firm quote")
+	}
+	if resp.GetQuote().GetQuoteAmount().GetAmount() != "110.00" {
+		t.Fatalf("unexpected quote amount: %s", resp.GetQuote().GetQuoteAmount().GetAmount())
+	}
+	if savedQuote.QuoteRef == "" {
+		t.Fatalf("expected quote persisted")
+	}
+}
+
+func TestServiceGetQuoteRateNotFound(t *testing.T) {
+	repo := &repositoryStub{
+		pairs: &pairStoreStub{
+			getFn: func(ctx context.Context, pair model.CurrencyPair) (*model.Pair, error) {
+				return &model.Pair{
+					Pair:      pair,
+					BaseMeta:  model.CurrencySettings{Code: pair.Base, Decimals: 2, Rounding: model.RoundingModeHalfEven},
+					QuoteMeta: model.CurrencySettings{Code: pair.Quote, Decimals: 2, Rounding: model.RoundingModeHalfEven},
+				}, nil
+			},
+		},
+		rates: &ratesStoreStub{latestFn: func(context.Context, model.CurrencyPair, string) (*model.RateSnapshot, error) {
+			return nil, merrors.ErrNoData
+		}},
+	}
+	svc := NewService(zap.NewNop(), repo, nil)
+
+	_, err := svc.GetQuote(context.Background(), &oraclev1.GetQuoteRequest{
+		Pair:        &fxv1.CurrencyPair{Base: "USD", Quote: "EUR"},
+		Side:        fxv1.Side_BUY_BASE_SELL_QUOTE,
+		AmountInput: &oraclev1.GetQuoteRequest_BaseAmount{BaseAmount: &moneyv1.Money{Currency: "USD", Amount: "1"}},
+	})
+	if err == nil {
+		t.Fatalf("expected error")
+	}
+}
+
+func TestServiceGetQuoteCrossRate(t *testing.T) {
+	repo := &repositoryStub{}
+	targetPair := model.CurrencyPair{Base: "EUR", Quote: "RUB"}
+	baseLegPair := model.CurrencyPair{Base: "USDT", Quote: "EUR"}
+	quoteLegPair := model.CurrencyPair{Base: "USDT", Quote: "RUB"}
+
+	repo.pairs = &pairStoreStub{
+		getFn: func(ctx context.Context, pair model.CurrencyPair) (*model.Pair, error) {
+			if pair != targetPair {
+				t.Fatalf("unexpected pair lookup: %v", pair)
+			}
+			return &model.Pair{
+				Pair:            pair,
+				BaseMeta:        model.CurrencySettings{Code: pair.Base, Decimals: 2, Rounding: model.RoundingModeHalfEven},
+				QuoteMeta:       model.CurrencySettings{Code: pair.Quote, Decimals: 2, Rounding: model.RoundingModeHalfEven},
+				DefaultProvider: "CROSSPROV",
+				Cross: &model.CrossRateConfig{
+					Enabled: true,
+					BaseLeg: model.CrossRateLeg{
+						Pair:   baseLegPair,
+						Invert: true,
+					},
+					QuoteLeg: model.CrossRateLeg{
+						Pair: quoteLegPair,
+					},
+				},
+			}, nil
+		},
+	}
+	repo.rates = &ratesStoreStub{
+		latestFn: func(ctx context.Context, pair model.CurrencyPair, provider string) (*model.RateSnapshot, error) {
+			switch pair {
+			case targetPair:
+				return nil, merrors.ErrNoData
+			case baseLegPair:
+				return &model.RateSnapshot{
+					Pair:       pair,
+					Provider:   provider,
+					Ask:        "0.90",
+					Bid:        "0.90",
+					Mid:        "0.90",
+					RateRef:    "base-leg",
+					AsOfUnixMs: 1_000,
+				}, nil
+			case quoteLegPair:
+				return &model.RateSnapshot{
+					Pair:       pair,
+					Provider:   provider,
+					Ask:        "90",
+					Bid:        "90",
+					Mid:        "90",
+					RateRef:    "quote-leg",
+					AsOfUnixMs: 2_000,
+				}, nil
+			default:
+				return nil, merrors.ErrNoData
+			}
+		},
+	}
+	repo.quotes = &quotesStoreStub{}
+	repo.currencies = currencyStoreStub{}
+
+	svc := NewService(zap.NewNop(), repo, nil)
+
+	req := &oraclev1.GetQuoteRequest{
+		Pair:        &fxv1.CurrencyPair{Base: "EUR", Quote: "RUB"},
+		Side:        fxv1.Side_BUY_BASE_SELL_QUOTE,
+		AmountInput: &oraclev1.GetQuoteRequest_BaseAmount{BaseAmount: &moneyv1.Money{Currency: "EUR", Amount: "1"}},
+	}
+
+	resp, err := svc.GetQuote(context.Background(), req)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if resp.GetQuote().GetPrice().GetValue() != "100.00" {
+		t.Fatalf("unexpected cross price: %s", resp.GetQuote().GetPrice().GetValue())
+	}
+	if resp.GetQuote().GetQuoteAmount().GetAmount() != "100.00" {
+		t.Fatalf("unexpected cross quote amount: %s", resp.GetQuote().GetQuoteAmount().GetAmount())
+	}
+	if !strings.HasPrefix(resp.GetQuote().GetRateRef(), "cross|") {
+		t.Fatalf("expected cross rate ref, got %s", resp.GetQuote().GetRateRef())
+	}
+	if resp.GetQuote().GetProvider() != "CROSSPROV" {
+		t.Fatalf("unexpected provider: %s", resp.GetQuote().GetProvider())
+	}
+
+}
+
+func TestServiceLatestRateCross(t *testing.T) {
+	repo := &repositoryStub{}
+	targetPair := model.CurrencyPair{Base: "EUR", Quote: "RUB"}
+	baseLegPair := model.CurrencyPair{Base: "USDT", Quote: "EUR"}
+	quoteLegPair := model.CurrencyPair{Base: "USDT", Quote: "RUB"}
+
+	repo.pairs = &pairStoreStub{
+		getFn: func(ctx context.Context, pair model.CurrencyPair) (*model.Pair, error) {
+			if pair != targetPair {
+				t.Fatalf("unexpected pair lookup: %v", pair)
+			}
+			return &model.Pair{
+				Pair:            pair,
+				BaseMeta:        model.CurrencySettings{Code: pair.Base, Decimals: 2, Rounding: model.RoundingModeHalfEven},
+				QuoteMeta:       model.CurrencySettings{Code: pair.Quote, Decimals: 2, Rounding: model.RoundingModeHalfEven},
+				DefaultProvider: "CROSSPROV",
+				Cross: &model.CrossRateConfig{
+					Enabled: true,
+					BaseLeg: model.CrossRateLeg{
+						Pair:   baseLegPair,
+						Invert: true,
+					},
+					QuoteLeg: model.CrossRateLeg{
+						Pair: quoteLegPair,
+					},
+				},
+			}, nil
+		},
+	}
+	repo.rates = &ratesStoreStub{
+		latestFn: func(ctx context.Context, pair model.CurrencyPair, provider string) (*model.RateSnapshot, error) {
+			switch pair {
+			case targetPair:
+				return nil, merrors.ErrNoData
+			case baseLegPair:
+				return &model.RateSnapshot{
+					Pair:       pair,
+					Provider:   provider,
+					Ask:        "0.90",
+					Bid:        "0.90",
+					Mid:        "0.90",
+					RateRef:    "base-leg",
+					AsOfUnixMs: 1_000,
+				}, nil
+			case quoteLegPair:
+				return &model.RateSnapshot{
+					Pair:       pair,
+					Provider:   provider,
+					Ask:        "90",
+					Bid:        "90",
+					Mid:        "90",
+					RateRef:    "quote-leg",
+					AsOfUnixMs: 2_000,
+				}, nil
+			default:
+				return nil, merrors.ErrNoData
+			}
+		},
+	}
+	repo.quotes = &quotesStoreStub{}
+	repo.currencies = currencyStoreStub{}
+
+	svc := NewService(zap.NewNop(), repo, nil)
+
+	resp, err := svc.LatestRate(context.Background(), &oraclev1.LatestRateRequest{
+		Pair: &fxv1.CurrencyPair{Base: "EUR", Quote: "RUB"},
+	})
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+
+	if resp.GetRate().GetMid().GetValue() != "100.00000000" {
+		t.Fatalf("unexpected mid price: %s", resp.GetRate().GetMid().GetValue())
+	}
+	if resp.GetRate().GetProvider() != "CROSSPROV" {
+		t.Fatalf("unexpected provider: %s", resp.GetRate().GetProvider())
+	}
+	if !strings.HasPrefix(resp.GetRate().GetRateRef(), "cross|") {
+		t.Fatalf("expected cross rate ref, got %s", resp.GetRate().GetRateRef())
+	}
+}
+
+func TestServiceValidateQuote(t *testing.T) {
+	now := time.Now().Add(time.Minute)
+	repo := &repositoryStub{
+		quotes: &quotesStoreStub{
+			getFn: func(context.Context, string) (*model.Quote, error) {
+				return &model.Quote{
+					QuoteRef:        "q1",
+					Pair:            model.CurrencyPair{Base: "USD", Quote: "EUR"},
+					Side:            model.QuoteSideBuyBaseSellQuote,
+					Price:           "1.10",
+					BaseAmount:      model.Money{Currency: "USD", Amount: "100"},
+					QuoteAmount:     model.Money{Currency: "EUR", Amount: "110"},
+					ExpiresAtUnixMs: now.UnixMilli(),
+					Status:          model.QuoteStatusIssued,
+				}, nil
+			},
+		},
+	}
+	svc := NewService(zap.NewNop(), repo, nil)
+
+	resp, err := svc.ValidateQuote(context.Background(), &oraclev1.ValidateQuoteRequest{QuoteRef: "q1"})
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if !resp.GetValid() {
+		t.Fatalf("expected quote valid")
+	}
+}
+
+func TestServiceConsumeQuoteExpired(t *testing.T) {
+	repo := &repositoryStub{
+		quotes: &quotesStoreStub{
+			consumeFn: func(context.Context, string, string, time.Time) (*model.Quote, error) {
+				return nil, storage.ErrQuoteExpired
+			},
+		},
+	}
+	svc := NewService(zap.NewNop(), repo, nil)
+
+	_, err := svc.ConsumeQuote(context.Background(), &oraclev1.ConsumeQuoteRequest{QuoteRef: "q1", LedgerTxnRef: "ledger"})
+	if err == nil {
+		t.Fatalf("expected error")
+	}
+}
+
+func TestServiceLatestRateSuccess(t *testing.T) {
+	repo := &repositoryStub{
+		rates: &ratesStoreStub{latestFn: func(_ context.Context, pair model.CurrencyPair, provider string) (*model.RateSnapshot, error) {
+			if pair != (model.CurrencyPair{Base: "USD", Quote: "EUR"}) {
+				t.Fatalf("unexpected pair: %v", pair)
+			}
+			if provider != "DEFAULT" {
+				t.Fatalf("unexpected provider: %s", provider)
+			}
+			return &model.RateSnapshot{Pair: pair, RateRef: "rate", Provider: provider}, nil
+		}},
+		pairs: &pairStoreStub{
+			getFn: func(ctx context.Context, pair model.CurrencyPair) (*model.Pair, error) {
+				return &model.Pair{
+					Pair:            pair,
+					BaseMeta:        model.CurrencySettings{Code: pair.Base, Decimals: 2, Rounding: model.RoundingModeHalfEven},
+					QuoteMeta:       model.CurrencySettings{Code: pair.Quote, Decimals: 2, Rounding: model.RoundingModeHalfEven},
+					DefaultProvider: "DEFAULT",
+				}, nil
+			},
+		},
+	}
+	svc := NewService(zap.NewNop(), repo, nil)
+
+	resp, err := svc.LatestRate(context.Background(), &oraclev1.LatestRateRequest{Pair: &fxv1.CurrencyPair{Base: "USD", Quote: "EUR"}})
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if resp.GetRate().GetRateRef() != "rate" {
+		t.Fatalf("unexpected rate ref")
+	}
+}
+
+func TestServiceListPairs(t *testing.T) {
+	repo := &repositoryStub{
+		pairs: &pairStoreStub{listFn: func(context.Context) ([]*model.Pair, error) {
+			return []*model.Pair{{Pair: model.CurrencyPair{Base: "USD", Quote: "EUR"}}}, nil
+		}},
+	}
+	svc := NewService(zap.NewNop(), repo, nil)
+
+	resp, err := svc.ListPairs(context.Background(), &oraclev1.ListPairsRequest{})
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if len(resp.GetPairs()) != 1 {
+		t.Fatalf("expected one pair")
+	}
+}

api/fx/oracle/internal/service/oracle/transform.go

@@ -0,0 +1,126 @@
+package oracle
+
+import (
+	"strings"
+
+	"github.com/tech/sendico/fx/storage/model"
+	fxv1 "github.com/tech/sendico/pkg/proto/common/fx/v1"
+	moneyv1 "github.com/tech/sendico/pkg/proto/common/money/v1"
+	tracev1 "github.com/tech/sendico/pkg/proto/common/trace/v1"
+	oraclev1 "github.com/tech/sendico/pkg/proto/oracle/v1"
+)
+
+func buildResponseMeta(meta *oraclev1.RequestMeta) *oraclev1.ResponseMeta {
+	resp := &oraclev1.ResponseMeta{}
+	if meta == nil {
+		return resp
+	}
+	resp.RequestRef = meta.GetRequestRef()
+	resp.TraceRef = meta.GetTraceRef()
+
+	trace := meta.GetTrace()
+	if trace == nil {
+		trace = &tracev1.TraceContext{
+			RequestRef:     meta.GetRequestRef(),
+			IdempotencyKey: meta.GetIdempotencyKey(),
+			TraceRef:       meta.GetTraceRef(),
+		}
+	}
+	resp.Trace = trace
+	return resp
+}
+
+func quoteModelToProto(q *model.Quote) *oraclev1.Quote {
+	if q == nil {
+		return nil
+	}
+
+	return &oraclev1.Quote{
+		QuoteRef:        q.QuoteRef,
+		Pair:            &fxv1.CurrencyPair{Base: q.Pair.Base, Quote: q.Pair.Quote},
+		Side:            sideModelToProto(q.Side),
+		Price:           decimalStringToProto(q.Price),
+		BaseAmount:      moneyModelToProto(&q.BaseAmount),
+		QuoteAmount:     moneyModelToProto(&q.QuoteAmount),
+		ExpiresAtUnixMs: q.ExpiresAtUnixMs,
+		Provider:        q.Provider,
+		RateRef:         q.RateRef,
+		Firm:            q.Firm,
+	}
+}
+
+func moneyModelToProto(m *model.Money) *moneyv1.Money {
+	if m == nil {
+		return nil
+	}
+	return &moneyv1.Money{Currency: m.Currency, Amount: m.Amount}
+}
+
+func sideModelToProto(side model.QuoteSide) fxv1.Side {
+	switch side {
+	case model.QuoteSideBuyBaseSellQuote:
+		return fxv1.Side_BUY_BASE_SELL_QUOTE
+	case model.QuoteSideSellBaseBuyQuote:
+		return fxv1.Side_SELL_BASE_BUY_QUOTE
+	default:
+		return fxv1.Side_SIDE_UNSPECIFIED
+	}
+}
+
+func rateModelToProto(rate *model.RateSnapshot) *oraclev1.RateSnapshot {
+	if rate == nil {
+		return nil
+	}
+	return &oraclev1.RateSnapshot{
+		Pair:       &fxv1.CurrencyPair{Base: rate.Pair.Base, Quote: rate.Pair.Quote},
+		Mid:        decimalStringToProto(rate.Mid),
+		Bid:        decimalStringToProto(rate.Bid),
+		Ask:        decimalStringToProto(rate.Ask),
+		AsofUnixMs: rate.AsOfUnixMs,
+		Provider:   rate.Provider,
+		RateRef:    rate.RateRef,
+		SpreadBps:  decimalStringToProto(rate.SpreadBps),
+	}
+}
+
+func pairModelToProto(pair *model.Pair) *oraclev1.PairMeta {
+	if pair == nil {
+		return nil
+	}
+	return &oraclev1.PairMeta{
+		Pair:      &fxv1.CurrencyPair{Base: pair.Pair.Base, Quote: pair.Pair.Quote},
+		BaseMeta:  currencySettingsToProto(&pair.BaseMeta),
+		QuoteMeta: currencySettingsToProto(&pair.QuoteMeta),
+	}
+}
+
+func currencySettingsToProto(c *model.CurrencySettings) *moneyv1.CurrencyMeta {
+	if c == nil {
+		return nil
+	}
+	return &moneyv1.CurrencyMeta{
+		Code:     c.Code,
+		Decimals: c.Decimals,
+		Rounding: roundingModeToProto(c.Rounding),
+	}
+}
+
+func roundingModeToProto(mode model.RoundingMode) moneyv1.RoundingMode {
+	switch mode {
+	case model.RoundingModeHalfUp:
+		return moneyv1.RoundingMode_ROUND_HALF_UP
+	case model.RoundingModeDown:
+		return moneyv1.RoundingMode_ROUND_DOWN
+	case model.RoundingModeHalfEven, model.RoundingModeUnspecified:
+		return moneyv1.RoundingMode_ROUND_HALF_EVEN
+	default:
+		return moneyv1.RoundingMode_ROUNDING_MODE_UNSPECIFIED
+	}
+}
+
+func decimalStringToProto(value string) *moneyv1.Decimal {
+	if strings.TrimSpace(value) == "" {
+		return nil
+	}
+	return &moneyv1.Decimal{Value: value}
+}

api/fx/oracle/main.go

@@ -0,0 +1,17 @@
+package main
+
+import (
+	"github.com/tech/sendico/fx/oracle/internal/appversion"
+	si "github.com/tech/sendico/fx/oracle/internal/server"
+	"github.com/tech/sendico/pkg/mlogger"
+	"github.com/tech/sendico/pkg/server"
+	smain "github.com/tech/sendico/pkg/server/main"
+)
+
+func factory(logger mlogger.Logger, file string, debug bool) (server.Application, error) {
+	return si.Create(logger, file, debug)
+}
+
+func main() {
+	smain.RunServer("main", appversion.Create(), factory)
+}

api/fx/storage/.gitignore

@@ -0,0 +1,2 @@
+internal/generated
+.gocache

api/fx/storage/go.mod

@@ -0,0 +1,32 @@
+module github.com/tech/sendico/fx/storage
+
+go 1.25.3
+
+replace github.com/tech/sendico/pkg => ../../pkg
+
+require (
+	github.com/tech/sendico/pkg v0.1.0
+	go.mongodb.org/mongo-driver v1.17.6
+	go.uber.org/zap v1.27.1
+)
+
+require (
+	github.com/bmatcuk/doublestar/v4 v4.9.1 // indirect
+	github.com/casbin/casbin/v2 v2.134.0 // indirect
+	github.com/casbin/govaluate v1.10.0 // indirect
+	github.com/casbin/mongodb-adapter/v3 v3.7.0 // indirect
+	github.com/golang/snappy v1.0.0 // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	github.com/klauspost/compress v1.18.2 // indirect
+	github.com/mitchellh/mapstructure v1.5.0 // indirect
+	github.com/montanaflynn/stats v0.7.1 // indirect
+	github.com/xdg-go/pbkdf2 v1.0.0 // indirect
+	github.com/xdg-go/scram v1.2.0 // indirect
+	github.com/xdg-go/stringprep v1.0.4 // indirect
+	github.com/youmark/pkcs8 v0.0.0-20240726163527-a2c0da244d78 // indirect
+	go.uber.org/multierr v1.11.0 // indirect
+	golang.org/x/crypto v0.45.0 // indirect
+	golang.org/x/sync v0.18.0 // indirect
+	golang.org/x/text v0.31.0 // indirect
+	google.golang.org/protobuf v1.36.10 // indirect
+)

api/fx/storage/go.sum

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api/fx/storage/model/cross.go

@@ -0,0 +1,18 @@
+package model
+
+// CrossRateConfig describes how to synthetically derive a currency pair using
+// two other pairs connected by a pivot currency.
+type CrossRateConfig struct {
+	Enabled       bool         `bson:"enabled" json:"enabled"`
+	PivotCurrency string       `bson:"pivotCurrency,omitempty" json:"pivotCurrency,omitempty"`
+	BaseLeg       CrossRateLeg `bson:"baseLeg" json:"baseLeg"`
+	QuoteLeg      CrossRateLeg `bson:"quoteLeg" json:"quoteLeg"`
+}
+
+// CrossRateLeg identifies a supporting currency pair and optional overrides to
+// fetch or orient its pricing data for cross-rate calculations.
+type CrossRateLeg struct {
+	Pair     CurrencyPair `bson:"pair" json:"pair"`
+	Invert   bool         `bson:"invert,omitempty" json:"invert,omitempty"`
+	Provider string       `bson:"provider,omitempty" json:"provider,omitempty"`
+}

api/fx/storage/model/currency.go

@@ -0,0 +1,27 @@
+package model
+
+import "github.com/tech/sendico/pkg/db/storable"
+
+// Currency captures rounding metadata for a given currency code.
+type Currency struct {
+	storable.Base `bson:",inline" json:",inline"`
+
+	Code        string       `bson:"code" json:"code"`
+	Decimals    uint32       `bson:"decimals" json:"decimals"`
+	Rounding    RoundingMode `bson:"rounding" json:"rounding"`
+	DisplayName string       `bson:"displayName,omitempty" json:"displayName,omitempty"`
+	Symbol      string       `bson:"symbol,omitempty" json:"symbol,omitempty"`
+	MinUnit     string       `bson:"minUnit,omitempty" json:"minUnit,omitempty"`
+}
+
+// Collection implements storable.Storable.
+func (*Currency) Collection() string {
+	return CurrenciesCollection
+}
+
+// CurrencySettings embeds precision details inside a Pair document.
+type CurrencySettings struct {
+	Code     string       `bson:"code" json:"code"`
+	Decimals uint32       `bson:"decimals" json:"decimals"`
+	Rounding RoundingMode `bson:"rounding" json:"rounding"`
+}

api/fx/storage/model/pair.go

@@ -0,0 +1,26 @@
+package model
+
+import "github.com/tech/sendico/pkg/db/storable"
+
+// Pair describes a supported FX currency pair and related metadata.
+type Pair struct {
+	storable.Base `bson:",inline" json:",inline"`
+
+	Pair              CurrencyPair     `bson:"pair" json:"pair"`
+	BaseMeta          CurrencySettings `bson:"baseMeta" json:"baseMeta"`
+	QuoteMeta         CurrencySettings `bson:"quoteMeta" json:"quoteMeta"`
+	Providers         []string         `bson:"providers,omitempty" json:"providers,omitempty"`
+	IsEnabled         bool             `bson:"isEnabled" json:"isEnabled"`
+	TenantRef         string           `bson:"tenantRef,omitempty" json:"tenantRef,omitempty"`
+	DefaultProvider   string           `bson:"defaultProvider,omitempty" json:"defaultProvider,omitempty"`
+	Attributes        map[string]any   `bson:"attributes,omitempty" json:"attributes,omitempty"`
+	SupportedSides    []QuoteSide      `bson:"supportedSides,omitempty" json:"supportedSides,omitempty"`
+	FallbackProviders []string         `bson:"fallbackProviders,omitempty" json:"fallbackProviders,omitempty"`
+	Tags              []string         `bson:"tags,omitempty" json:"tags,omitempty"`
+	Cross             *CrossRateConfig `bson:"cross,omitempty" json:"cross,omitempty"`
+}
+
+// Collection implements storable.Storable.
+func (*Pair) Collection() string {
+	return PairsCollection
+}

api/fx/storage/model/quote.go

@@ -0,0 +1,63 @@
+package model
+
+import (
+	"time"
+
+	"github.com/tech/sendico/pkg/db/storable"
+)
+
+// Quote represents a firm or indicative quote persisted by the oracle.
+type Quote struct {
+	storable.Base `bson:",inline" json:",inline"`
+
+	QuoteRef               string          `bson:"quoteRef" json:"quoteRef"`
+	Firm                   bool            `bson:"firm" json:"firm"`
+	Status                 QuoteStatus     `bson:"status" json:"status"`
+	Pair                   CurrencyPair    `bson:"pair" json:"pair"`
+	Side                   QuoteSide       `bson:"side" json:"side"`
+	Price                  string          `bson:"price" json:"price"`
+	BaseAmount             Money           `bson:"baseAmount" json:"baseAmount"`
+	QuoteAmount            Money           `bson:"quoteAmount" json:"quoteAmount"`
+	AmountType             QuoteAmountType `bson:"amountType" json:"amountType"`
+	ExpiresAtUnixMs        int64           `bson:"expiresAtUnixMs" json:"expiresAtUnixMs"`
+	ExpiresAt              *time.Time      `bson:"expiresAt,omitempty" json:"expiresAt,omitempty"`
+	RateRef                string          `bson:"rateRef" json:"rateRef"`
+	Provider               string          `bson:"provider" json:"provider"`
+	PreferredProvider      string          `bson:"preferredProvider,omitempty" json:"preferredProvider,omitempty"`
+	RequestedTTLMs         int64           `bson:"requestedTtlMs,omitempty" json:"requestedTtlMs,omitempty"`
+	MaxAgeToleranceMs      int64           `bson:"maxAgeToleranceMs,omitempty" json:"maxAgeToleranceMs,omitempty"`
+	ConsumedByLedgerTxnRef string          `bson:"consumedByLedgerTxnRef,omitempty" json:"consumedByLedgerTxnRef,omitempty"`
+	ConsumedAtUnixMs       *int64          `bson:"consumedAtUnixMs,omitempty" json:"consumedAtUnixMs,omitempty"`
+	Meta                   *QuoteMeta      `bson:"meta,omitempty" json:"meta,omitempty"`
+}
+
+// Collection implements storable.Storable.
+func (*Quote) Collection() string {
+	return QuotesCollection
+}
+
+// MarkConsumed switches the quote to consumed status and links it to a ledger transaction.
+func (q *Quote) MarkConsumed(ledgerTxnRef string, consumedAt time.Time) {
+	if ledgerTxnRef == "" {
+		return
+	}
+	q.Status = QuoteStatusConsumed
+	q.ConsumedByLedgerTxnRef = ledgerTxnRef
+	ts := consumedAt.UnixMilli()
+	q.ConsumedAtUnixMs = &ts
+	q.Base.Update()
+}
+
+// MarkExpired marks the quote as expired.
+func (q *Quote) MarkExpired() {
+	q.Status = QuoteStatusExpired
+	q.Base.Update()
+}
+
+// IsExpired reports whether the quote has passed its expiration instant.
+func (q *Quote) IsExpired(now time.Time) bool {
+	if q.ExpiresAtUnixMs == 0 {
+		return false
+	}
+	return now.UnixMilli() >= q.ExpiresAtUnixMs
+}

api/fx/storage/model/rate.go

@@ -0,0 +1,34 @@
+package model
+
+import (
+	"time"
+
+	"github.com/tech/sendico/pkg/db/storable"
+)
+
+// RateSnapshot stores a normalized FX rate observation.
+type RateSnapshot struct {
+	storable.Base `bson:",inline" json:",inline"`
+
+	RateRef     string       `bson:"rateRef" json:"rateRef"`
+	Pair        CurrencyPair `bson:"pair" json:"pair"`
+	Provider    string       `bson:"provider" json:"provider"`
+	Mid         string       `bson:"mid,omitempty" json:"mid,omitempty"`
+	Bid         string       `bson:"bid,omitempty" json:"bid,omitempty"`
+	Ask         string       `bson:"ask,omitempty" json:"ask,omitempty"`
+	SpreadBps   string       `bson:"spreadBps,omitempty" json:"spreadBps,omitempty"`
+	AsOfUnixMs  int64        `bson:"asOfUnixMs" json:"asOfUnixMs"`
+	AsOf        *time.Time   `bson:"asOf,omitempty" json:"asOf,omitempty"`
+	Source      string       `bson:"source,omitempty" json:"source,omitempty"`
+	ProviderRef string       `bson:"providerRef,omitempty" json:"providerRef,omitempty"`
+}
+
+// Collection implements storable.Storable.
+func (*RateSnapshot) Collection() string {
+	return RatesCollection
+}
+
+// AsOfTime converts the stored millisecond timestamp to time.Time.
+func (r *RateSnapshot) AsOfTime() time.Time {
+	return time.UnixMilli(r.AsOfUnixMs)
+}

api/fx/storage/model/types.go

@@ -0,0 +1,68 @@
+package model
+
+import "github.com/tech/sendico/pkg/model"
+
+// Collection names used by the FX oracle persistence layer.
+const (
+	RatesCollection      = "rates"
+	QuotesCollection     = "quotes"
+	CurrenciesCollection = "currencies"
+	PairsCollection      = "pairs"
+)
+
+// QuoteStatus tracks the lifecycle state of a quote.
+type QuoteStatus string
+
+const (
+	QuoteStatusIssued   QuoteStatus = "issued"
+	QuoteStatusConsumed QuoteStatus = "consumed"
+	QuoteStatusExpired  QuoteStatus = "expired"
+)
+
+// QuoteSide expresses the trade direction for the requested quote.
+type QuoteSide string
+
+const (
+	QuoteSideBuyBaseSellQuote QuoteSide = "buy_base_sell_quote"
+	QuoteSideSellBaseBuyQuote QuoteSide = "sell_base_buy_quote"
+)
+
+// QuoteAmountType indicates which leg amount was provided by the caller.
+type QuoteAmountType string
+
+const (
+	QuoteAmountTypeBase  QuoteAmountType = "base"
+	QuoteAmountTypeQuote QuoteAmountType = "quote"
+)
+
+// RoundingMode describes how rounding should be applied for a currency.
+type RoundingMode string
+
+const (
+	RoundingModeUnspecified RoundingMode = "unspecified"
+	RoundingModeHalfEven    RoundingMode = "half_even"
+	RoundingModeHalfUp      RoundingMode = "half_up"
+	RoundingModeDown        RoundingMode = "down"
+)
+
+// CurrencyPair identifies an FX pair.
+type CurrencyPair struct {
+	Base  string `bson:"base" json:"base"`
+	Quote string `bson:"quote" json:"quote"`
+}
+
+// Money represents an exact decimal amount with its currency.
+type Money struct {
+	Currency string `bson:"currency" json:"currency"`
+	Amount   string `bson:"amount" json:"amount"`
+}
+
+// QuoteMeta carries request-scoped metadata associated with a quote.
+type QuoteMeta struct {
+	model.OrganizationBoundBase `bson:",inline" json:",inline"`
+
+	RequestRef     string `bson:"requestRef,omitempty" json:"requestRef,omitempty"`
+	TenantRef      string `bson:"tenantRef,omitempty" json:"tenantRef,omitempty"`
+	TraceRef       string `bson:"traceRef,omitempty" json:"traceRef,omitempty"`
+	IdempotencyKey string `bson:"idempotencyKey,omitempty" json:"idempotencyKey,omitempty"`
+}

api/fx/storage/mongo/repository.go

@@ -0,0 +1,115 @@
+package mongo
+
+import (
+	"context"
+	"time"
+
+	"github.com/tech/sendico/fx/storage"
+	"github.com/tech/sendico/fx/storage/mongo/store"
+	"github.com/tech/sendico/pkg/db"
+	"github.com/tech/sendico/pkg/db/transaction"
+	"github.com/tech/sendico/pkg/merrors"
+	"github.com/tech/sendico/pkg/mlogger"
+	"go.mongodb.org/mongo-driver/mongo"
+	"go.uber.org/zap"
+)
+
+type Store struct {
+	logger    mlogger.Logger
+	conn      *db.MongoConnection
+	db        *mongo.Database
+	txFactory transaction.Factory
+
+	rates      storage.RatesStore
+	quotes     storage.QuotesStore
+	pairs      storage.PairStore
+	currencies storage.CurrencyStore
+}
+
+func New(logger mlogger.Logger, conn *db.MongoConnection) (*Store, error) {
+	if conn == nil {
+		return nil, merrors.InvalidArgument("mongo connection is nil")
+	}
+
+	client := conn.Client()
+	if client == nil {
+		return nil, merrors.Internal("mongo client not initialised")
+	}
+
+	db := conn.Database()
+	txFactory := newMongoTransactionFactory(client)
+
+	s := &Store{
+		logger:    logger.Named("storage").Named("mongo"),
+		conn:      conn,
+		db:        db,
+		txFactory: txFactory,
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+
+	if err := s.Ping(ctx); err != nil {
+		s.logger.Error("mongo ping failed during store init", zap.Error(err))
+		return nil, err
+	}
+
+	ratesStore, err := store.NewRates(s.logger, db)
+	if err != nil {
+		s.logger.Error("failed to initialize rates store", zap.Error(err))
+		return nil, err
+	}
+	quotesStore, err := store.NewQuotes(s.logger, db, txFactory)
+	if err != nil {
+		s.logger.Error("failed to initialize quotes store", zap.Error(err))
+		return nil, err
+	}
+	pairsStore, err := store.NewPair(s.logger, db)
+	if err != nil {
+		s.logger.Error("failed to initialize pair store", zap.Error(err))
+		return nil, err
+	}
+	currencyStore, err := store.NewCurrency(s.logger, db)
+	if err != nil {
+		s.logger.Error("failed to initialize currency store", zap.Error(err))
+		return nil, err
+	}
+
+	s.rates = ratesStore
+	s.quotes = quotesStore
+	s.pairs = pairsStore
+	s.currencies = currencyStore
+
+	s.logger.Info("mongo storage ready")
+	return s, nil
+}
+
+func (s *Store) Ping(ctx context.Context) error {
+	return s.conn.Ping(ctx)
+}
+
+func (s *Store) Rates() storage.RatesStore {
+	return s.rates
+}
+
+func (s *Store) Quotes() storage.QuotesStore {
+	return s.quotes
+}
+
+func (s *Store) Pairs() storage.PairStore {
+	return s.pairs
+}
+
+func (s *Store) Currencies() storage.CurrencyStore {
+	return s.currencies
+}
+
+func (s *Store) Database() *mongo.Database {
+	return s.db
+}
+
+func (s *Store) TransactionFactory() transaction.Factory {
+	return s.txFactory
+}
+
+var _ storage.Repository = (*Store)(nil)

api/fx/storage/mongo/store/currency.go

@@ -0,0 +1,113 @@
+package store
+
+import (
+	"context"
+	"errors"
+
+	"github.com/tech/sendico/fx/storage"
+	"github.com/tech/sendico/fx/storage/model"
+	"github.com/tech/sendico/pkg/db/repository"
+	ri "github.com/tech/sendico/pkg/db/repository/index"
+	"github.com/tech/sendico/pkg/merrors"
+	"github.com/tech/sendico/pkg/mlogger"
+	"go.mongodb.org/mongo-driver/mongo"
+	"go.uber.org/zap"
+)
+
+type currencyStore struct {
+	logger mlogger.Logger
+	repo   repository.Repository
+}
+
+func NewCurrency(logger mlogger.Logger, db *mongo.Database) (storage.CurrencyStore, error) {
+	repo := repository.CreateMongoRepository(db, model.CurrenciesCollection)
+
+	index := &ri.Definition{
+		Keys: []ri.Key{
+			{Field: "code", Sort: ri.Asc},
+		},
+		Unique: true,
+	}
+	if err := repo.CreateIndex(index); err != nil {
+		logger.Error("failed to ensure currencies index", zap.Error(err))
+		return nil, err
+	}
+	childLogger := logger.Named(model.CurrenciesCollection)
+	childLogger.Debug("currency store initialised", zap.String("collection", model.CurrenciesCollection))
+
+	return &currencyStore{
+		logger: childLogger,
+		repo:   repo,
+	}, nil
+}
+
+func (c *currencyStore) Get(ctx context.Context, code string) (*model.Currency, error) {
+	if code == "" {
+		c.logger.Warn("attempt to fetch currency with empty code")
+		return nil, merrors.InvalidArgument("currencyStore: empty code")
+	}
+	result := &model.Currency{}
+	if err := c.repo.FindOneByFilter(ctx, repository.Filter("code", code), result); err != nil {
+		if errors.Is(err, merrors.ErrNoData) {
+			c.logger.Debug("currency not found", zap.String("code", code))
+		}
+		return nil, err
+	}
+	c.logger.Debug("currency loaded", zap.String("code", code))
+	return result, nil
+}
+
+func (c *currencyStore) List(ctx context.Context, codes ...string) ([]*model.Currency, error) {
+	query := repository.Query()
+	if len(codes) > 0 {
+		values := make([]any, len(codes))
+		for i, code := range codes {
+			values[i] = code
+		}
+		query = query.In(repository.Field("code"), values...)
+	}
+
+	currencies := make([]*model.Currency, 0)
+	err := c.repo.FindManyByFilter(ctx, query, func(cur *mongo.Cursor) error {
+		doc := &model.Currency{}
+		if err := cur.Decode(doc); err != nil {
+			return err
+		}
+		currencies = append(currencies, doc)
+		return nil
+	})
+	if err != nil {
+		c.logger.Error("failed to list currencies", zap.Error(err))
+		return nil, err
+	}
+	c.logger.Debug("listed currencies", zap.Int("count", len(currencies)))
+	return currencies, nil
+}
+
+func (c *currencyStore) Upsert(ctx context.Context, currency *model.Currency) error {
+	if currency == nil {
+		c.logger.Warn("attempt to upsert nil currency")
+		return merrors.InvalidArgument("currencyStore: nil currency")
+	}
+	if currency.Code == "" {
+		c.logger.Warn("attempt to upsert currency with empty code")
+		return merrors.InvalidArgument("currencyStore: empty code")
+	}
+
+	existing := &model.Currency{}
+	filter := repository.Filter("code", currency.Code)
+	if err := c.repo.FindOneByFilter(ctx, filter, existing); err != nil {
+		if errors.Is(err, merrors.ErrNoData) {
+			c.logger.Debug("inserting new currency", zap.String("code", currency.Code))
+			return c.repo.Insert(ctx, currency, filter)
+		}
+		c.logger.Error("failed to fetch currency", zap.Error(err), zap.String("code", currency.Code))
+		return err
+	}
+
+	if existing.GetID() != nil {
+		currency.SetID(*existing.GetID())
+	}
+	c.logger.Debug("updating currency", zap.String("code", currency.Code))
+	return c.repo.Update(ctx, currency)
+}

api/fx/storage/mongo/store/currency_test.go

@@ -0,0 +1,104 @@
+package store
+
+import (
+	"context"
+	"errors"
+	"testing"
+
+	"github.com/tech/sendico/fx/storage/model"
+	"github.com/tech/sendico/pkg/db/repository/builder"
+	rd "github.com/tech/sendico/pkg/db/repository/decoder"
+	"github.com/tech/sendico/pkg/db/storable"
+	"github.com/tech/sendico/pkg/merrors"
+	"go.mongodb.org/mongo-driver/bson/primitive"
+	"go.uber.org/zap"
+)
+
+func TestCurrencyStoreGet(t *testing.T) {
+	repo := &repoStub{
+		findOneFn: func(_ context.Context, _ builder.Query, result storable.Storable) error {
+			currency := result.(*model.Currency)
+			currency.Code = "USD"
+			return nil
+		},
+	}
+	store := &currencyStore{logger: zap.NewNop(), repo: repo}
+
+	res, err := store.Get(context.Background(), "USD")
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if res.Code != "USD" {
+		t.Fatalf("unexpected code: %s", res.Code)
+	}
+}
+
+func TestCurrencyStoreList(t *testing.T) {
+	repo := &repoStub{
+		findManyFn: func(_ context.Context, _ builder.Query, decode rd.DecodingFunc) error {
+			return runDecoderWithDocs(t, decode, &model.Currency{Code: "USD"})
+		},
+	}
+	store := &currencyStore{logger: zap.NewNop(), repo: repo}
+
+	currencies, err := store.List(context.Background(), "USD")
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if len(currencies) != 1 || currencies[0].Code != "USD" {
+		t.Fatalf("unexpected list result: %+v", currencies)
+	}
+}
+
+func TestCurrencyStoreUpsertInsert(t *testing.T) {
+	inserted := false
+	repo := &repoStub{
+		findOneFn: func(context.Context, builder.Query, storable.Storable) error {
+			return merrors.ErrNoData
+		},
+		insertFn: func(_ context.Context, obj storable.Storable, _ builder.Query) error {
+			_ = cloneCurrency(t, obj)
+			inserted = true
+			return nil
+		},
+	}
+	store := &currencyStore{logger: zap.NewNop(), repo: repo}
+
+	if err := store.Upsert(context.Background(), &model.Currency{Code: "USD"}); err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if !inserted {
+		t.Fatalf("expected insert to be called")
+	}
+}
+
+func TestCurrencyStoreGetInvalid(t *testing.T) {
+	store := &currencyStore{logger: zap.NewNop(), repo: &repoStub{}}
+	if _, err := store.Get(context.Background(), ""); !errors.Is(err, merrors.ErrInvalidArg) {
+		t.Fatalf("expected invalid argument error")
+	}
+}
+
+func TestCurrencyStoreUpsertUpdate(t *testing.T) {
+	var updated *model.Currency
+	repo := &repoStub{
+		findOneFn: func(_ context.Context, _ builder.Query, result storable.Storable) error {
+			currency := result.(*model.Currency)
+			currency.SetID(primitive.NewObjectID())
+			currency.Code = "USD"
+			return nil
+		},
+		updateFn: func(_ context.Context, obj storable.Storable) error {
+			updated = cloneCurrency(t, obj)
+			return nil
+		},
+	}
+	store := &currencyStore{logger: zap.NewNop(), repo: repo}
+
+	if err := store.Upsert(context.Background(), &model.Currency{Code: "USD"}); err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if updated == nil || updated.GetID() == nil {
+		t.Fatalf("expected update to preserve ID")
+	}
+}

api/fx/storage/mongo/store/pair.go

@@ -0,0 +1,111 @@
+package store
+
+import (
+	"context"
+	"errors"
+
+	"github.com/tech/sendico/fx/storage"
+	"github.com/tech/sendico/fx/storage/model"
+	"github.com/tech/sendico/pkg/db/repository"
+	ri "github.com/tech/sendico/pkg/db/repository/index"
+	"github.com/tech/sendico/pkg/merrors"
+	"github.com/tech/sendico/pkg/mlogger"
+	"go.mongodb.org/mongo-driver/mongo"
+	"go.uber.org/zap"
+)
+
+type pairStore struct {
+	logger mlogger.Logger
+	repo   repository.Repository
+}
+
+func NewPair(logger mlogger.Logger, db *mongo.Database) (storage.PairStore, error) {
+	repo := repository.CreateMongoRepository(db, model.PairsCollection)
+	index := &ri.Definition{
+		Keys: []ri.Key{
+			{Field: "pair.base", Sort: ri.Asc},
+			{Field: "pair.quote", Sort: ri.Asc},
+		},
+		Unique: true,
+	}
+	if err := repo.CreateIndex(index); err != nil {
+		logger.Error("failed to ensure pairs index", zap.Error(err))
+		return nil, err
+	}
+	logger.Debug("pair store initialised", zap.String("collection", model.PairsCollection))
+
+	return &pairStore{
+		logger: logger.Named(model.PairsCollection),
+		repo:   repo,
+	}, nil
+}
+
+func (p *pairStore) ListEnabled(ctx context.Context) ([]*model.Pair, error) {
+	filter := repository.Query().Filter(repository.Field("isEnabled"), true)
+
+	pairs := make([]*model.Pair, 0)
+	err := p.repo.FindManyByFilter(ctx, filter, func(cur *mongo.Cursor) error {
+		doc := &model.Pair{}
+		if err := cur.Decode(doc); err != nil {
+			return err
+		}
+		pairs = append(pairs, doc)
+		return nil
+	})
+	if err != nil {
+		p.logger.Error("failed to list enabled pairs", zap.Error(err))
+		return nil, err
+	}
+	p.logger.Debug("listed enabled pairs", zap.Int("count", len(pairs)))
+	return pairs, nil
+}
+
+func (p *pairStore) Get(ctx context.Context, pair model.CurrencyPair) (*model.Pair, error) {
+	if pair.Base == "" || pair.Quote == "" {
+		p.logger.Warn("attempt to fetch pair with empty currency", zap.String("base", pair.Base), zap.String("quote", pair.Quote))
+		return nil, merrors.InvalidArgument("pairStore: incomplete pair")
+	}
+	result := &model.Pair{}
+	query := repository.Query().
+		Filter(repository.Field("pair").Dot("base"), pair.Base).
+		Filter(repository.Field("pair").Dot("quote"), pair.Quote)
+	if err := p.repo.FindOneByFilter(ctx, query, result); err != nil {
+		if errors.Is(err, merrors.ErrNoData) {
+			p.logger.Debug("pair not found", zap.String("base", pair.Base), zap.String("quote", pair.Quote))
+		}
+		return nil, err
+	}
+	p.logger.Debug("pair loaded", zap.String("base", pair.Base), zap.String("quote", pair.Quote))
+	return result, nil
+}
+
+func (p *pairStore) Upsert(ctx context.Context, pair *model.Pair) error {
+	if pair == nil {
+		p.logger.Warn("attempt to upsert nil pair")
+		return merrors.InvalidArgument("pairStore: nil pair")
+	}
+	if pair.Pair.Base == "" || pair.Pair.Quote == "" {
+		p.logger.Warn("attempt to upsert pair with empty currency", zap.String("base", pair.Pair.Base), zap.String("quote", pair.Pair.Quote))
+		return merrors.InvalidArgument("pairStore: incomplete pair")
+	}
+
+	existing := &model.Pair{}
+	query := repository.Query().
+		Filter(repository.Field("pair").Dot("base"), pair.Pair.Base).
+		Filter(repository.Field("pair").Dot("quote"), pair.Pair.Quote)
+	err := p.repo.FindOneByFilter(ctx, query, existing)
+	if err != nil {
+		if errors.Is(err, merrors.ErrNoData) {
+			p.logger.Debug("inserting new pair", zap.String("base", pair.Pair.Base), zap.String("quote", pair.Pair.Quote))
+			return p.repo.Insert(ctx, pair, query)
+		}
+		p.logger.Error("failed to fetch pair", zap.Error(err), zap.String("base", pair.Pair.Base), zap.String("quote", pair.Pair.Quote))
+		return err
+	}
+
+	if existing.GetID() != nil {
+		pair.SetID(*existing.GetID())
+	}
+	p.logger.Debug("updating pair", zap.String("base", pair.Pair.Base), zap.String("quote", pair.Pair.Quote))
+	return p.repo.Update(ctx, pair)
+}

api/fx/storage/mongo/store/pair_test.go

@@ -0,0 +1,101 @@
+package store
+
+import (
+	"context"
+	"errors"
+	"testing"
+
+	"github.com/tech/sendico/fx/storage/model"
+	"github.com/tech/sendico/pkg/db/repository/builder"
+	rd "github.com/tech/sendico/pkg/db/repository/decoder"
+	"github.com/tech/sendico/pkg/db/storable"
+	"github.com/tech/sendico/pkg/merrors"
+	"go.mongodb.org/mongo-driver/bson/primitive"
+	"go.uber.org/zap"
+)
+
+func TestPairStoreListEnabled(t *testing.T) {
+	repo := &repoStub{
+		findManyFn: func(_ context.Context, _ builder.Query, decode rd.DecodingFunc) error {
+			docs := []interface{}{
+				&model.Pair{Pair: model.CurrencyPair{Base: "USD", Quote: "EUR"}},
+			}
+			return runDecoderWithDocs(t, decode, docs...)
+		},
+	}
+	store := &pairStore{logger: zap.NewNop(), repo: repo}
+
+	pairs, err := store.ListEnabled(context.Background())
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if len(pairs) != 1 || pairs[0].Pair.Base != "USD" {
+		t.Fatalf("unexpected pairs result: %+v", pairs)
+	}
+}
+
+func TestPairStoreGetInvalid(t *testing.T) {
+	store := &pairStore{logger: zap.NewNop(), repo: &repoStub{}}
+	if _, err := store.Get(context.Background(), model.CurrencyPair{}); !errors.Is(err, merrors.ErrInvalidArg) {
+		t.Fatalf("expected invalid argument error")
+	}
+}
+
+func TestPairStoreGetNotFound(t *testing.T) {
+	repo := &repoStub{
+		findOneFn: func(context.Context, builder.Query, storable.Storable) error {
+			return merrors.ErrNoData
+		},
+	}
+	store := &pairStore{logger: zap.NewNop(), repo: repo}
+
+	if _, err := store.Get(context.Background(), model.CurrencyPair{Base: "USD", Quote: "EUR"}); !errors.Is(err, merrors.ErrNoData) {
+		t.Fatalf("expected ErrNoData, got %v", err)
+	}
+}
+
+func TestPairStoreUpsertInsert(t *testing.T) {
+	ctx := context.Background()
+	var inserted *model.Pair
+	repo := &repoStub{
+		findOneFn: func(context.Context, builder.Query, storable.Storable) error {
+			return merrors.ErrNoData
+		},
+		insertFn: func(_ context.Context, obj storable.Storable, _ builder.Query) error {
+			inserted = clonePair(t, obj)
+			return nil
+		},
+	}
+	store := &pairStore{logger: zap.NewNop(), repo: repo}
+	pair := &model.Pair{Pair: model.CurrencyPair{Base: "USD", Quote: "EUR"}}
+	if err := store.Upsert(ctx, pair); err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if inserted == nil {
+		t.Fatalf("expected insert to be called")
+	}
+}
+
+func TestPairStoreUpsertUpdate(t *testing.T) {
+	ctx := context.Background()
+	var updated *model.Pair
+	repo := &repoStub{
+		findOneFn: func(_ context.Context, _ builder.Query, result storable.Storable) error {
+			pair := result.(*model.Pair)
+			pair.SetID(primitive.NewObjectID())
+			return nil
+		},
+		updateFn: func(_ context.Context, obj storable.Storable) error {
+			updated = clonePair(t, obj)
+			return nil
+		},
+	}
+	store := &pairStore{logger: zap.NewNop(), repo: repo}
+
+	if err := store.Upsert(ctx, &model.Pair{Pair: model.CurrencyPair{Base: "USD", Quote: "EUR"}}); err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if updated == nil || updated.GetID() == nil {
+		t.Fatalf("expected update to preserve existing ID")
+	}
+}

api/fx/storage/mongo/store/quotes.go

@@ -0,0 +1,198 @@
+package store
+
+import (
+	"context"
+	"errors"
+	"time"
+
+	"github.com/tech/sendico/fx/storage"
+	"github.com/tech/sendico/fx/storage/model"
+	"github.com/tech/sendico/pkg/db/repository"
+	"github.com/tech/sendico/pkg/db/repository/builder"
+	ri "github.com/tech/sendico/pkg/db/repository/index"
+	"github.com/tech/sendico/pkg/db/transaction"
+	"github.com/tech/sendico/pkg/merrors"
+	"github.com/tech/sendico/pkg/mlogger"
+	"go.mongodb.org/mongo-driver/mongo"
+	"go.uber.org/zap"
+)
+
+type quotesStore struct {
+	logger    mlogger.Logger
+	repo      repository.Repository
+	txFactory transaction.Factory
+}
+
+func NewQuotes(logger mlogger.Logger, db *mongo.Database, txFactory transaction.Factory) (storage.QuotesStore, error) {
+	repo := repository.CreateMongoRepository(db, model.QuotesCollection)
+	indexes := []*ri.Definition{
+		{
+			Keys: []ri.Key{
+				{Field: "quoteRef", Sort: ri.Asc},
+			},
+			Unique: true,
+		},
+		{
+			Keys: []ri.Key{
+				{Field: "status", Sort: ri.Asc},
+				{Field: "expiresAtUnixMs", Sort: ri.Asc},
+			},
+		},
+		{
+			Keys: []ri.Key{
+				{Field: "consumedByLedgerTxnRef", Sort: ri.Asc},
+			},
+		},
+	}
+
+	ttlSeconds := int32(0)
+	indexes = append(indexes, &ri.Definition{
+		Keys: []ri.Key{
+			{Field: "expiresAt", Sort: ri.Asc},
+		},
+		TTL:  &ttlSeconds,
+		Name: "quotes_expires_at_ttl",
+	})
+
+	for _, def := range indexes {
+		if err := repo.CreateIndex(def); err != nil {
+			logger.Error("failed to ensure quotes index", zap.Error(err))
+			return nil, err
+		}
+	}
+	childLogger := logger.Named(model.QuotesCollection)
+	childLogger.Debug("quotes store initialised", zap.String("collection", model.QuotesCollection))
+
+	return &quotesStore{
+		logger:    childLogger,
+		repo:      repo,
+		txFactory: txFactory,
+	}, nil
+}
+
+func (q *quotesStore) Issue(ctx context.Context, quote *model.Quote) error {
+	if quote == nil {
+		q.logger.Warn("attempt to issue nil quote")
+		return merrors.InvalidArgument("quotesStore: nil quote")
+	}
+	if quote.QuoteRef == "" {
+		q.logger.Warn("attempt to issue quote with empty ref")
+		return merrors.InvalidArgument("quotesStore: empty quoteRef")
+	}
+
+	if quote.ExpiresAtUnixMs > 0 && quote.ExpiresAt == nil {
+		expiry := time.UnixMilli(quote.ExpiresAtUnixMs)
+		quote.ExpiresAt = &expiry
+	}
+
+	quote.Status = model.QuoteStatusIssued
+	quote.ConsumedByLedgerTxnRef = ""
+	quote.ConsumedAtUnixMs = nil
+	if err := q.repo.Insert(ctx, quote, repository.Filter("quoteRef", quote.QuoteRef)); err != nil {
+		q.logger.Error("failed to insert quote", zap.Error(err), zap.String("quote_ref", quote.QuoteRef))
+		return err
+	}
+	q.logger.Debug("quote issued", zap.String("quote_ref", quote.QuoteRef), zap.Bool("firm", quote.Firm))
+	return nil
+}
+
+func (q *quotesStore) GetByRef(ctx context.Context, quoteRef string) (*model.Quote, error) {
+	if quoteRef == "" {
+		q.logger.Warn("attempt to fetch quote with empty ref")
+		return nil, merrors.InvalidArgument("quotesStore: empty quoteRef")
+	}
+	quote := &model.Quote{}
+	if err := q.repo.FindOneByFilter(ctx, repository.Filter("quoteRef", quoteRef), quote); err != nil {
+		if errors.Is(err, merrors.ErrNoData) {
+			q.logger.Debug("quote not found", zap.String("quote_ref", quoteRef))
+		}
+		return nil, err
+	}
+	q.logger.Debug("quote loaded", zap.String("quote_ref", quoteRef), zap.String("status", string(quote.Status)))
+	return quote, nil
+}
+
+func (q *quotesStore) Consume(ctx context.Context, quoteRef, ledgerTxnRef string, when time.Time) (*model.Quote, error) {
+	if quoteRef == "" || ledgerTxnRef == "" {
+		q.logger.Warn("attempt to consume quote with missing identifiers", zap.String("quote_ref", quoteRef), zap.String("ledger_ref", ledgerTxnRef))
+		return nil, merrors.InvalidArgument("quotesStore: missing identifiers")
+	}
+
+	if when.IsZero() {
+		when = time.Now()
+	}
+
+	q.logger.Debug("consuming quote", zap.String("quote_ref", quoteRef), zap.String("ledger_ref", ledgerTxnRef))
+	txn := q.txFactory.CreateTransaction()
+	result, err := txn.Execute(ctx, func(txCtx context.Context) (any, error) {
+		quote := &model.Quote{}
+		if err := q.repo.FindOneByFilter(txCtx, repository.Filter("quoteRef", quoteRef), quote); err != nil {
+			return nil, err
+		}
+
+		if !quote.Firm {
+			q.logger.Warn("quote not firm", zap.String("quote_ref", quoteRef))
+			return nil, storage.ErrQuoteNotFirm
+		}
+
+		if quote.Status == model.QuoteStatusExpired || quote.IsExpired(when) {
+			quote.MarkExpired()
+			if err := q.repo.Update(txCtx, quote); err != nil {
+				return nil, err
+			}
+			q.logger.Info("quote expired during consume", zap.String("quote_ref", quoteRef))
+			return nil, storage.ErrQuoteExpired
+		}
+
+		if quote.Status == model.QuoteStatusConsumed {
+			if quote.ConsumedByLedgerTxnRef == ledgerTxnRef {
+				q.logger.Debug("quote already consumed by ledger", zap.String("quote_ref", quoteRef), zap.String("ledger_ref", ledgerTxnRef))
+				return quote, nil
+			}
+			q.logger.Warn("quote consumed by different ledger", zap.String("quote_ref", quoteRef), zap.String("existing_ledger_ref", quote.ConsumedByLedgerTxnRef))
+			return nil, storage.ErrQuoteConsumed
+		}
+
+		quote.MarkConsumed(ledgerTxnRef, when)
+		if err := q.repo.Update(txCtx, quote); err != nil {
+			return nil, err
+		}
+		q.logger.Info("quote consumed", zap.String("quote_ref", quoteRef), zap.String("ledger_ref", ledgerTxnRef))
+		return quote, nil
+	})
+	if err != nil {
+		q.logger.Error("quote consumption failed", zap.Error(err), zap.String("quote_ref", quoteRef), zap.String("ledger_ref", ledgerTxnRef))
+		return nil, err
+	}
+	quote, _ := result.(*model.Quote)
+	if quote == nil {
+		return nil, merrors.Internal("quotesStore: transaction returned nil quote")
+	}
+	return quote, nil
+}
+
+func (q *quotesStore) ExpireIssuedBefore(ctx context.Context, cutoff time.Time) (int, error) {
+	if cutoff.IsZero() {
+		q.logger.Warn("attempt to expire quotes with zero cutoff")
+		return 0, merrors.InvalidArgument("quotesStore: cutoff time is zero")
+	}
+
+	filter := repository.Query().
+		Filter(repository.Field("status"), model.QuoteStatusIssued).
+		Comparison(repository.Field("expiresAtUnixMs"), builder.Lt, cutoff.UnixMilli())
+
+	patch := repository.Patch().
+		Set(repository.Field("status"), model.QuoteStatusExpired).
+		Unset(repository.Field("consumedByLedgerTxnRef")).
+		Unset(repository.Field("consumedAtUnixMs"))
+
+	updated, err := q.repo.PatchMany(ctx, filter, patch)
+	if err != nil {
+		q.logger.Error("failed to expire quotes", zap.Error(err))
+		return 0, err
+	}
+	if updated > 0 {
+		q.logger.Info("quotes expired", zap.Int("count", updated))
+	}
+	return updated, nil
+}

api/fx/storage/mongo/store/quotes_test.go

@@ -0,0 +1,184 @@
+package store
+
+import (
+	"context"
+	"errors"
+	"testing"
+	"time"
+
+	"github.com/tech/sendico/fx/storage"
+	"github.com/tech/sendico/fx/storage/model"
+	"github.com/tech/sendico/pkg/db/repository/builder"
+	"github.com/tech/sendico/pkg/db/storable"
+	"github.com/tech/sendico/pkg/merrors"
+	"go.uber.org/zap"
+)
+
+func TestQuotesStoreIssue(t *testing.T) {
+	ctx := context.Background()
+	var inserted *model.Quote
+	repo := &repoStub{
+		insertFn: func(_ context.Context, obj storable.Storable, _ builder.Query) error {
+			inserted = cloneQuote(t, obj)
+			return nil
+		},
+	}
+	store := &quotesStore{logger: zap.NewNop(), repo: repo, txFactory: &txFactoryStub{}}
+
+	quote := &model.Quote{QuoteRef: "q1"}
+	if err := store.Issue(ctx, quote); err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if inserted == nil || inserted.Status != model.QuoteStatusIssued {
+		t.Fatalf("expected issued quote to be inserted")
+	}
+}
+
+func TestQuotesStoreIssueSetsExpiryDate(t *testing.T) {
+	ctx := context.Background()
+	var inserted *model.Quote
+	repo := &repoStub{
+		insertFn: func(_ context.Context, obj storable.Storable, _ builder.Query) error {
+			inserted = cloneQuote(t, obj)
+			return nil
+		},
+	}
+	store := &quotesStore{logger: zap.NewNop(), repo: repo, txFactory: &txFactoryStub{}}
+
+	expiry := time.Now().Add(2 * time.Minute).UnixMilli()
+	quote := &model.Quote{
+		QuoteRef:        "q1",
+		ExpiresAtUnixMs: expiry,
+	}
+
+	if err := store.Issue(ctx, quote); err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if inserted == nil || inserted.ExpiresAt == nil {
+		t.Fatalf("expected expiry timestamp to be populated")
+	}
+	if inserted.ExpiresAt.UnixMilli() != expiry {
+		t.Fatalf("expected expiry to equal %d, got %d", expiry, inserted.ExpiresAt.UnixMilli())
+	}
+}
+
+func TestQuotesStoreIssueInvalidInput(t *testing.T) {
+	store := &quotesStore{logger: zap.NewNop(), repo: &repoStub{}, txFactory: &txFactoryStub{}}
+	if err := store.Issue(context.Background(), nil); !errors.Is(err, merrors.ErrInvalidArg) {
+		t.Fatalf("expected invalid argument error, got %v", err)
+	}
+}
+
+func TestQuotesStoreConsumeSuccess(t *testing.T) {
+	ctx := context.Background()
+	now := time.Now()
+	ledgerRef := "ledger-1"
+
+	stored := &model.Quote{
+		QuoteRef:        "q1",
+		Firm:            true,
+		Status:          model.QuoteStatusIssued,
+		ExpiresAtUnixMs: now.Add(5 * time.Minute).UnixMilli(),
+	}
+	var updated *model.Quote
+	repo := &repoStub{
+		findOneFn: func(_ context.Context, _ builder.Query, result storable.Storable) error {
+			quote := result.(*model.Quote)
+			*quote = *stored
+			return nil
+		},
+		updateFn: func(_ context.Context, obj storable.Storable) error {
+			updated = cloneQuote(t, obj)
+			return nil
+		},
+	}
+	factory := &txFactoryStub{}
+	store := &quotesStore{logger: zap.NewNop(), repo: repo, txFactory: factory}
+
+	res, err := store.Consume(ctx, "q1", ledgerRef, now)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if res == nil || res.Status != model.QuoteStatusConsumed {
+		t.Fatalf("expected consumed quote")
+	}
+	if updated == nil || updated.ConsumedByLedgerTxnRef != ledgerRef {
+		t.Fatalf("expected update with ledger ref")
+	}
+}
+
+func TestQuotesStoreConsumeExpired(t *testing.T) {
+	ctx := context.Background()
+	stored := &model.Quote{
+		QuoteRef:        "q1",
+		Firm:            true,
+		Status:          model.QuoteStatusIssued,
+		ExpiresAtUnixMs: time.Now().Add(-time.Minute).UnixMilli(),
+	}
+	var updated *model.Quote
+	repo := &repoStub{
+		findOneFn: func(_ context.Context, _ builder.Query, result storable.Storable) error {
+			quote := result.(*model.Quote)
+			*quote = *stored
+			return nil
+		},
+		updateFn: func(_ context.Context, obj storable.Storable) error {
+			updated = cloneQuote(t, obj)
+			return nil
+		},
+	}
+	factory := &txFactoryStub{}
+	store := &quotesStore{logger: zap.NewNop(), repo: repo, txFactory: factory}
+
+	_, err := store.Consume(ctx, "q1", "ledger", time.Now())
+	if !errors.Is(err, storage.ErrQuoteExpired) {
+		t.Fatalf("expected ErrQuoteExpired, got %v", err)
+	}
+	if updated == nil || updated.Status != model.QuoteStatusExpired {
+		t.Fatalf("expected quote marked expired")
+	}
+}
+
+func TestQuotesStoreExpireIssuedBefore(t *testing.T) {
+	repo := &repoStub{
+		patchManyFn: func(context.Context, builder.Query, builder.Patch) (int, error) {
+			return 3, nil
+		},
+	}
+	store := &quotesStore{logger: zap.NewNop(), repo: repo, txFactory: &txFactoryStub{}}
+
+	count, err := store.ExpireIssuedBefore(context.Background(), time.Now())
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if count != 3 {
+		t.Fatalf("expected 3 expired quotes, got %d", count)
+	}
+}
+
+func TestQuotesStoreExpireZeroCutoff(t *testing.T) {
+	store := &quotesStore{logger: zap.NewNop(), repo: &repoStub{}, txFactory: &txFactoryStub{}}
+	if _, err := store.ExpireIssuedBefore(context.Background(), time.Time{}); !errors.Is(err, merrors.ErrInvalidArg) {
+		t.Fatalf("expected invalid argument error")
+	}
+}
+
+func TestQuotesStoreGetByRefNotFound(t *testing.T) {
+	repo := &repoStub{
+		findOneFn: func(context.Context, builder.Query, storable.Storable) error {
+			return merrors.ErrNoData
+		},
+	}
+	store := &quotesStore{logger: zap.NewNop(), repo: repo, txFactory: &txFactoryStub{}}
+
+	if _, err := store.GetByRef(context.Background(), "missing"); !errors.Is(err, merrors.ErrNoData) {
+		t.Fatalf("expected ErrNoData, got %v", err)
+	}
+}
+
+func TestQuotesStoreGetByRefInvalid(t *testing.T) {
+	store := &quotesStore{logger: zap.NewNop(), repo: &repoStub{}, txFactory: &txFactoryStub{}}
+	if _, err := store.GetByRef(context.Background(), ""); !errors.Is(err, merrors.ErrInvalidArg) {
+		t.Fatalf("expected invalid argument error")
+	}
+}

api/fx/storage/mongo/store/rates.go

@@ -0,0 +1,127 @@
+package store
+
+import (
+	"context"
+	"errors"
+	"time"
+
+	"github.com/tech/sendico/fx/storage"
+	"github.com/tech/sendico/fx/storage/model"
+	"github.com/tech/sendico/pkg/db/repository"
+	ri "github.com/tech/sendico/pkg/db/repository/index"
+	"github.com/tech/sendico/pkg/merrors"
+	"github.com/tech/sendico/pkg/mlogger"
+	"go.mongodb.org/mongo-driver/mongo"
+	"go.uber.org/zap"
+)
+
+type ratesStore struct {
+	logger mlogger.Logger
+	repo   repository.Repository
+}
+
+func NewRates(logger mlogger.Logger, db *mongo.Database) (storage.RatesStore, error) {
+	repo := repository.CreateMongoRepository(db, model.RatesCollection)
+
+	indexes := []*ri.Definition{
+		{
+			Keys: []ri.Key{
+				{Field: "pair.base", Sort: ri.Asc},
+				{Field: "pair.quote", Sort: ri.Asc},
+				{Field: "provider", Sort: ri.Asc},
+				{Field: "asOfUnixMs", Sort: ri.Desc},
+			},
+		},
+		{
+			Keys: []ri.Key{
+				{Field: "rateRef", Sort: ri.Asc},
+			},
+			Unique: true,
+		},
+	}
+
+	ttlSeconds := int32(24 * 60 * 60)
+	indexes = append(indexes, &ri.Definition{
+		Keys: []ri.Key{
+			{Field: "asOf", Sort: ri.Asc},
+		},
+		TTL:  &ttlSeconds,
+		Name: "rates_as_of_ttl",
+	})
+
+	for _, def := range indexes {
+		if err := repo.CreateIndex(def); err != nil {
+			logger.Error("failed to ensure rates index", zap.Error(err))
+			return nil, err
+		}
+	}
+	logger.Debug("rates store initialised", zap.String("collection", model.RatesCollection))
+	return &ratesStore{
+		logger: logger.Named(model.RatesCollection),
+		repo:   repo,
+	}, nil
+}
+
+func (r *ratesStore) UpsertSnapshot(ctx context.Context, snapshot *model.RateSnapshot) error {
+	if snapshot == nil {
+		r.logger.Warn("attempt to upsert nil snapshot")
+		return merrors.InvalidArgument("ratesStore: nil snapshot")
+	}
+	if snapshot.RateRef == "" {
+		r.logger.Warn("attempt to upsert snapshot with empty rate_ref")
+		return merrors.InvalidArgument("ratesStore: empty rateRef")
+	}
+
+	if snapshot.AsOfUnixMs > 0 && snapshot.AsOf == nil {
+		asOf := time.UnixMilli(snapshot.AsOfUnixMs).UTC()
+		snapshot.AsOf = &asOf
+	}
+
+	existing := &model.RateSnapshot{}
+	filter := repository.Filter("rateRef", snapshot.RateRef)
+	err := r.repo.FindOneByFilter(ctx, filter, existing)
+	if err != nil {
+		if errors.Is(err, merrors.ErrNoData) {
+			r.logger.Debug("inserting new rate snapshot", zap.String("rate_ref", snapshot.RateRef))
+			return r.repo.Insert(ctx, snapshot, filter)
+		}
+		r.logger.Error("failed to query rate snapshot", zap.Error(err), zap.String("rate_ref", snapshot.RateRef))
+		return err
+	}
+
+	if existing.GetID() != nil {
+		snapshot.SetID(*existing.GetID())
+	}
+	r.logger.Debug("updating rate snapshot", zap.String("rate_ref", snapshot.RateRef))
+	return r.repo.Update(ctx, snapshot)
+}
+
+func (r *ratesStore) LatestSnapshot(ctx context.Context, pair model.CurrencyPair, provider string) (*model.RateSnapshot, error) {
+	query := repository.Query().
+		Filter(repository.Field("pair").Dot("base"), pair.Base).
+		Filter(repository.Field("pair").Dot("quote"), pair.Quote)
+
+	if provider != "" {
+		query = query.Filter(repository.Field("provider"), provider)
+	}
+
+	limit := int64(1)
+	query = query.Sort(repository.Field("asOfUnixMs"), false).Limit(&limit)
+
+	var result *model.RateSnapshot
+	err := r.repo.FindManyByFilter(ctx, query, func(cur *mongo.Cursor) error {
+		doc := &model.RateSnapshot{}
+		if err := cur.Decode(doc); err != nil {
+			return err
+		}
+		result = doc
+		return nil
+	})
+	if err != nil {
+		return nil, err
+	}
+	if result == nil {
+		return nil, merrors.ErrNoData
+	}
+	return result, nil
+}

api/fx/storage/mongo/store/rates_test.go

@@ -0,0 +1,87 @@
+package store
+
+import (
+	"context"
+	"testing"
+	"time"
+
+	"github.com/tech/sendico/fx/storage/model"
+	"github.com/tech/sendico/pkg/db/repository/builder"
+	rd "github.com/tech/sendico/pkg/db/repository/decoder"
+	"github.com/tech/sendico/pkg/db/storable"
+	"github.com/tech/sendico/pkg/merrors"
+	"go.mongodb.org/mongo-driver/bson/primitive"
+	"go.uber.org/zap"
+)
+
+func TestRatesStoreUpsertInsert(t *testing.T) {
+	ctx := context.Background()
+	var inserted *model.RateSnapshot
+
+	repo := &repoStub{
+		findOneFn: func(context.Context, builder.Query, storable.Storable) error {
+			return merrors.ErrNoData
+		},
+		insertFn: func(_ context.Context, obj storable.Storable, _ builder.Query) error {
+			inserted = cloneRate(t, obj)
+			return nil
+		},
+	}
+	store := &ratesStore{logger: zap.NewNop(), repo: repo}
+
+	snapshot := &model.RateSnapshot{RateRef: "r1"}
+	if err := store.UpsertSnapshot(ctx, snapshot); err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if inserted == nil || inserted.RateRef != "r1" {
+		t.Fatalf("expected snapshot to be inserted")
+	}
+}
+
+func TestRatesStoreUpsertUpdate(t *testing.T) {
+	ctx := context.Background()
+	existingID := primitive.NewObjectID()
+	var updated *model.RateSnapshot
+
+	repo := &repoStub{
+		findOneFn: func(_ context.Context, _ builder.Query, result storable.Storable) error {
+			snap := result.(*model.RateSnapshot)
+			snap.SetID(existingID)
+			snap.RateRef = "existing"
+			return nil
+		},
+		updateFn: func(_ context.Context, obj storable.Storable) error {
+			snap := obj.(*model.RateSnapshot)
+			updated = snap
+			return nil
+		},
+	}
+
+	store := &ratesStore{logger: zap.NewNop(), repo: repo}
+	toUpdate := &model.RateSnapshot{RateRef: "existing"}
+	if err := store.UpsertSnapshot(ctx, toUpdate); err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if updated == nil || updated.GetID() == nil || *updated.GetID() != existingID {
+		t.Fatalf("expected update to preserve ID")
+	}
+}
+
+func TestRatesStoreLatestSnapshot(t *testing.T) {
+	now := time.Now().UnixMilli()
+	repo := &repoStub{
+		findManyFn: func(_ context.Context, _ builder.Query, decode rd.DecodingFunc) error {
+			doc := &model.RateSnapshot{RateRef: "latest", AsOfUnixMs: now}
+			return runDecoderWithDocs(t, decode, doc)
+		},
+	}
+
+	store := &ratesStore{logger: zap.NewNop(), repo: repo}
+	res, err := store.LatestSnapshot(context.Background(), model.CurrencyPair{Base: "USD", Quote: "EUR"}, "")
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if res.RateRef != "latest" || res.AsOfUnixMs != now {
+		t.Fatalf("unexpected snapshot returned: %+v", res)
+	}
+}

api/fx/storage/mongo/store/testing_helpers_test.go

@@ -0,0 +1,189 @@
+package store
+
+import (
+	"context"
+	"testing"
+
+	"github.com/tech/sendico/fx/storage/model"
+	"github.com/tech/sendico/pkg/db/repository/builder"
+	rd "github.com/tech/sendico/pkg/db/repository/decoder"
+	ri "github.com/tech/sendico/pkg/db/repository/index"
+	"github.com/tech/sendico/pkg/db/storable"
+	"github.com/tech/sendico/pkg/db/transaction"
+	"github.com/tech/sendico/pkg/merrors"
+	pmodel "github.com/tech/sendico/pkg/model"
+	"go.mongodb.org/mongo-driver/bson/primitive"
+	"go.mongodb.org/mongo-driver/mongo"
+)
+
+type repoStub struct {
+	insertFn     func(ctx context.Context, obj storable.Storable, filter builder.Query) error
+	insertManyFn func(ctx context.Context, objects []storable.Storable) error
+	findOneFn    func(ctx context.Context, query builder.Query, result storable.Storable) error
+	findManyFn   func(ctx context.Context, query builder.Query, decoder rd.DecodingFunc) error
+	updateFn     func(ctx context.Context, obj storable.Storable) error
+	patchManyFn  func(ctx context.Context, filter builder.Query, patch builder.Patch) (int, error)
+	createIdxFn  func(def *ri.Definition) error
+}
+
+func (r *repoStub) Aggregate(ctx context.Context, b builder.Pipeline, decoder rd.DecodingFunc) error {
+	return merrors.NotImplemented("Aggregate not used")
+}
+
+func (r *repoStub) Insert(ctx context.Context, obj storable.Storable, filter builder.Query) error {
+	if r.insertFn != nil {
+		return r.insertFn(ctx, obj, filter)
+	}
+	return nil
+}
+
+func (r *repoStub) InsertMany(ctx context.Context, objects []storable.Storable) error {
+	if r.insertManyFn != nil {
+		return r.insertManyFn(ctx, objects)
+	}
+	return nil
+}
+
+func (r *repoStub) Get(ctx context.Context, id primitive.ObjectID, result storable.Storable) error {
+	return merrors.NotImplemented("Get not used")
+}
+
+func (r *repoStub) FindOneByFilter(ctx context.Context, query builder.Query, result storable.Storable) error {
+	if r.findOneFn != nil {
+		return r.findOneFn(ctx, query, result)
+	}
+	return nil
+}
+
+func (r *repoStub) FindManyByFilter(ctx context.Context, query builder.Query, decoder rd.DecodingFunc) error {
+	if r.findManyFn != nil {
+		return r.findManyFn(ctx, query, decoder)
+	}
+	return nil
+}
+
+func (r *repoStub) Update(ctx context.Context, obj storable.Storable) error {
+	if r.updateFn != nil {
+		return r.updateFn(ctx, obj)
+	}
+	return nil
+}
+
+func (r *repoStub) Patch(ctx context.Context, id primitive.ObjectID, patch builder.Patch) error {
+	return merrors.NotImplemented("Patch not used")
+}
+
+func (r *repoStub) PatchMany(ctx context.Context, filter builder.Query, patch builder.Patch) (int, error) {
+	if r.patchManyFn != nil {
+		return r.patchManyFn(ctx, filter, patch)
+	}
+	return 0, nil
+}
+
+func (r *repoStub) Delete(ctx context.Context, id primitive.ObjectID) error {
+	return merrors.NotImplemented("Delete not used")
+}
+
+func (r *repoStub) DeleteMany(ctx context.Context, query builder.Query) error {
+	return merrors.NotImplemented("DeleteMany not used")
+}
+
+func (r *repoStub) CreateIndex(def *ri.Definition) error {
+	if r.createIdxFn != nil {
+		return r.createIdxFn(def)
+	}
+	return nil
+}
+
+func (r *repoStub) ListIDs(ctx context.Context, query builder.Query) ([]primitive.ObjectID, error) {
+	return nil, merrors.NotImplemented("ListIDs not used")
+}
+
+func (r *repoStub) ListPermissionBound(ctx context.Context, query builder.Query) ([]pmodel.PermissionBoundStorable, error) {
+	return nil, merrors.NotImplemented("ListPermissionBound not used")
+}
+
+func (r *repoStub) ListAccountBound(ctx context.Context, query builder.Query) ([]pmodel.AccountBoundStorable, error) {
+	return nil, merrors.NotImplemented("ListAccountBound not used")
+}
+
+func (r *repoStub) Collection() string { return "test" }
+
+type txFactoryStub struct {
+	executeFn func(ctx context.Context, cb transaction.Callback) (any, error)
+}
+
+func (f *txFactoryStub) CreateTransaction() transaction.Transaction {
+	return &txStub{executeFn: f.executeFn}
+}
+
+type txStub struct {
+	executeFn func(ctx context.Context, cb transaction.Callback) (any, error)
+}
+
+func (t *txStub) Execute(ctx context.Context, cb transaction.Callback) (any, error) {
+	if t.executeFn != nil {
+		return t.executeFn(ctx, cb)
+	}
+	return cb(ctx)
+}
+
+func cloneRate(t *testing.T, obj storable.Storable) *model.RateSnapshot {
+	t.Helper()
+	rate, ok := obj.(*model.RateSnapshot)
+	if !ok {
+		t.Fatalf("expected *model.RateSnapshot, got %T", obj)
+	}
+	copy := *rate
+	return &copy
+}
+
+func cloneQuote(t *testing.T, obj storable.Storable) *model.Quote {
+	t.Helper()
+	quote, ok := obj.(*model.Quote)
+	if !ok {
+		t.Fatalf("expected *model.Quote, got %T", obj)
+	}
+	copy := *quote
+	return &copy
+}
+
+func clonePair(t *testing.T, obj storable.Storable) *model.Pair {
+	t.Helper()
+	pair, ok := obj.(*model.Pair)
+	if !ok {
+		t.Fatalf("expected *model.Pair, got %T", obj)
+	}
+	copy := *pair
+	return &copy
+}
+
+func cloneCurrency(t *testing.T, obj storable.Storable) *model.Currency {
+	t.Helper()
+	currency, ok := obj.(*model.Currency)
+	if !ok {
+		t.Fatalf("expected *model.Currency, got %T", obj)
+	}
+	copy := *currency
+	return &copy
+}
+
+func runDecoderWithDocs(t *testing.T, decode rd.DecodingFunc, docs ...interface{}) error {
+	t.Helper()
+	cur, err := mongo.NewCursorFromDocuments(docs, nil, nil)
+	if err != nil {
+		t.Fatalf("failed to create cursor: %v", err)
+	}
+	defer cur.Close(context.Background())
+
+	if len(docs) > 0 {
+		if !cur.Next(context.Background()) {
+			return cur.Err()
+		}
+	}
+
+	if err := decode(cur); err != nil {
+		return err
+	}
+	return cur.Err()
+}

api/fx/storage/mongo/transaction.go

@@ -0,0 +1,38 @@
+package mongo
+
+import (
+	"context"
+
+	"github.com/tech/sendico/pkg/db/transaction"
+	"go.mongodb.org/mongo-driver/mongo"
+)
+
+type mongoTransactionFactory struct {
+	client *mongo.Client
+}
+
+func (f *mongoTransactionFactory) CreateTransaction() transaction.Transaction {
+	return &mongoTransaction{client: f.client}
+}
+
+type mongoTransaction struct {
+	client *mongo.Client
+}
+
+func (t *mongoTransaction) Execute(ctx context.Context, cb transaction.Callback) (any, error) {
+	session, err := t.client.StartSession()
+	if err != nil {
+		return nil, err
+	}
+	defer session.EndSession(ctx)
+
+	run := func(sessCtx mongo.SessionContext) (any, error) {
+		return cb(sessCtx)
+	}
+
+	return session.WithTransaction(ctx, run)
+}
+
+func newMongoTransactionFactory(client *mongo.Client) transaction.Factory {
+	return &mongoTransactionFactory{client: client}
+}

api/fx/storage/storage.go

@@ -0,0 +1,53 @@
+package storage
+
+import (
+	"context"
+	"time"
+
+	"github.com/tech/sendico/fx/storage/model"
+)
+
+type storageError string
+
+func (e storageError) Error() string {
+	return string(e)
+}
+
+var (
+	ErrQuoteExpired         = storageError("fx.storage: quote expired")
+	ErrQuoteConsumed        = storageError("fx.storage: quote consumed")
+	ErrQuoteNotFirm         = storageError("fx.storage: quote is not firm")
+	ErrQuoteConsumptionRace = storageError("fx.storage: quote consumption collision")
+)
+
+type Repository interface {
+	Ping(ctx context.Context) error
+	Rates() RatesStore
+	Quotes() QuotesStore
+	Pairs() PairStore
+	Currencies() CurrencyStore
+}
+
+type RatesStore interface {
+	UpsertSnapshot(ctx context.Context, snapshot *model.RateSnapshot) error
+	LatestSnapshot(ctx context.Context, pair model.CurrencyPair, provider string) (*model.RateSnapshot, error)
+}
+
+type QuotesStore interface {
+	Issue(ctx context.Context, quote *model.Quote) error
+	GetByRef(ctx context.Context, quoteRef string) (*model.Quote, error)
+	Consume(ctx context.Context, quoteRef, ledgerTxnRef string, when time.Time) (*model.Quote, error)
+	ExpireIssuedBefore(ctx context.Context, cutoff time.Time) (int, error)
+}
+
+type PairStore interface {
+	ListEnabled(ctx context.Context) ([]*model.Pair, error)
+	Get(ctx context.Context, pair model.CurrencyPair) (*model.Pair, error)
+	Upsert(ctx context.Context, p *model.Pair) error
+}
+
+type CurrencyStore interface {
+	Get(ctx context.Context, code string) (*model.Currency, error)
+	List(ctx context.Context, codes ...string) ([]*model.Currency, error)
+	Upsert(ctx context.Context, currency *model.Currency) error
+}

api/gateway/chain/.air.toml

@@ -0,0 +1,32 @@
+# Config file for Air in TOML format
+
+root = "./../.."
+tmp_dir = "tmp"
+
+[build]
+cmd = "go build -o app -ldflags \"-X 'github.com/tech/sendico/gateway/chain/internal/appversion.BuildUser=$(whoami)' -X 'github.com/tech/sendico/gateway/chain/internal/appversion.Version=$APP_V' -X 'github.com/tech/sendico/gateway/chain/internal/appversion.Branch=$BUILD_BRANCH' -X 'github.com/tech/sendico/gateway/chain/internal/appversion.Revision=$GIT_REV' -X 'github.com/tech/sendico/gateway/chain/internal/appversion.BuildDate=$(date)'\""
+bin = "./app"
+full_bin = "./app --debug --config.file=config.yml"
+include_ext = ["go", "yaml", "yml"]
+exclude_dir = ["gateway/chain/tmp", "pkg/.git", "gateway/chain/env"]
+exclude_regex = ["_test\\.go"]
+exclude_unchanged = true
+follow_symlink = true
+log = "air.log"
+delay = 0
+stop_on_error = true
+send_interrupt = true
+kill_delay = 500
+args_bin = []
+
+[log]
+time = false
+
+[color]
+main = "magenta"
+watcher = "cyan"
+build = "yellow"
+runner = "green"
+
+[misc]
+clean_on_exit = true

api/gateway/chain/.gitignore

@@ -0,0 +1,3 @@
+internal/generated
+.gocache
+app

api/gateway/chain/client/client.go

@@ -0,0 +1,148 @@
+package client
+
+import (
+	"context"
+	"crypto/tls"
+	"fmt"
+	"strings"
+	"time"
+
+	"github.com/tech/sendico/pkg/merrors"
+	chainv1 "github.com/tech/sendico/pkg/proto/gateway/chain/v1"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/credentials"
+	"google.golang.org/grpc/credentials/insecure"
+)
+
+// Client exposes typed helpers around the chain gateway gRPC API.
+type Client interface {
+	CreateManagedWallet(ctx context.Context, req *chainv1.CreateManagedWalletRequest) (*chainv1.CreateManagedWalletResponse, error)
+	GetManagedWallet(ctx context.Context, req *chainv1.GetManagedWalletRequest) (*chainv1.GetManagedWalletResponse, error)
+	ListManagedWallets(ctx context.Context, req *chainv1.ListManagedWalletsRequest) (*chainv1.ListManagedWalletsResponse, error)
+	GetWalletBalance(ctx context.Context, req *chainv1.GetWalletBalanceRequest) (*chainv1.GetWalletBalanceResponse, error)
+	SubmitTransfer(ctx context.Context, req *chainv1.SubmitTransferRequest) (*chainv1.SubmitTransferResponse, error)
+	GetTransfer(ctx context.Context, req *chainv1.GetTransferRequest) (*chainv1.GetTransferResponse, error)
+	ListTransfers(ctx context.Context, req *chainv1.ListTransfersRequest) (*chainv1.ListTransfersResponse, error)
+	EstimateTransferFee(ctx context.Context, req *chainv1.EstimateTransferFeeRequest) (*chainv1.EstimateTransferFeeResponse, error)
+	Close() error
+}
+
+type grpcGatewayClient interface {
+	CreateManagedWallet(ctx context.Context, in *chainv1.CreateManagedWalletRequest, opts ...grpc.CallOption) (*chainv1.CreateManagedWalletResponse, error)
+	GetManagedWallet(ctx context.Context, in *chainv1.GetManagedWalletRequest, opts ...grpc.CallOption) (*chainv1.GetManagedWalletResponse, error)
+	ListManagedWallets(ctx context.Context, in *chainv1.ListManagedWalletsRequest, opts ...grpc.CallOption) (*chainv1.ListManagedWalletsResponse, error)
+	GetWalletBalance(ctx context.Context, in *chainv1.GetWalletBalanceRequest, opts ...grpc.CallOption) (*chainv1.GetWalletBalanceResponse, error)
+	SubmitTransfer(ctx context.Context, in *chainv1.SubmitTransferRequest, opts ...grpc.CallOption) (*chainv1.SubmitTransferResponse, error)
+	GetTransfer(ctx context.Context, in *chainv1.GetTransferRequest, opts ...grpc.CallOption) (*chainv1.GetTransferResponse, error)
+	ListTransfers(ctx context.Context, in *chainv1.ListTransfersRequest, opts ...grpc.CallOption) (*chainv1.ListTransfersResponse, error)
+	EstimateTransferFee(ctx context.Context, in *chainv1.EstimateTransferFeeRequest, opts ...grpc.CallOption) (*chainv1.EstimateTransferFeeResponse, error)
+}
+
+type chainGatewayClient struct {
+	cfg    Config
+	conn   *grpc.ClientConn
+	client grpcGatewayClient
+}
+
+// New dials the chain gateway endpoint and returns a ready client.
+func New(ctx context.Context, cfg Config, opts ...grpc.DialOption) (Client, error) {
+	cfg.setDefaults()
+	if strings.TrimSpace(cfg.Address) == "" {
+		return nil, merrors.InvalidArgument("chain-gateway: address is required")
+	}
+
+	dialCtx, cancel := context.WithTimeout(ctx, cfg.DialTimeout)
+	defer cancel()
+
+	dialOpts := make([]grpc.DialOption, 0, len(opts)+1)
+	dialOpts = append(dialOpts, opts...)
+
+	if cfg.Insecure {
+		dialOpts = append(dialOpts, grpc.WithTransportCredentials(insecure.NewCredentials()))
+	} else {
+		dialOpts = append(dialOpts, grpc.WithTransportCredentials(credentials.NewTLS(&tls.Config{})))
+	}
+
+	conn, err := grpc.DialContext(dialCtx, cfg.Address, dialOpts...)
+	if err != nil {
+		return nil, merrors.Internal(fmt.Sprintf("chain-gateway: dial %s: %s", cfg.Address, err.Error()))
+	}
+
+	return &chainGatewayClient{
+		cfg:    cfg,
+		conn:   conn,
+		client: chainv1.NewChainGatewayServiceClient(conn),
+	}, nil
+}
+
+// NewWithClient injects a pre-built gateway client (useful for tests).
+func NewWithClient(cfg Config, gc grpcGatewayClient) Client {
+	cfg.setDefaults()
+	return &chainGatewayClient{
+		cfg:    cfg,
+		client: gc,
+	}
+}
+
+func (c *chainGatewayClient) Close() error {
+	if c.conn != nil {
+		return c.conn.Close()
+	}
+	return nil
+}
+
+func (c *chainGatewayClient) CreateManagedWallet(ctx context.Context, req *chainv1.CreateManagedWalletRequest) (*chainv1.CreateManagedWalletResponse, error) {
+	ctx, cancel := c.callContext(ctx)
+	defer cancel()
+	return c.client.CreateManagedWallet(ctx, req)
+}
+
+func (c *chainGatewayClient) GetManagedWallet(ctx context.Context, req *chainv1.GetManagedWalletRequest) (*chainv1.GetManagedWalletResponse, error) {
+	ctx, cancel := c.callContext(ctx)
+	defer cancel()
+	return c.client.GetManagedWallet(ctx, req)
+}
+
+func (c *chainGatewayClient) ListManagedWallets(ctx context.Context, req *chainv1.ListManagedWalletsRequest) (*chainv1.ListManagedWalletsResponse, error) {
+	ctx, cancel := c.callContext(ctx)
+	defer cancel()
+	return c.client.ListManagedWallets(ctx, req)
+}
+
+func (c *chainGatewayClient) GetWalletBalance(ctx context.Context, req *chainv1.GetWalletBalanceRequest) (*chainv1.GetWalletBalanceResponse, error) {
+	ctx, cancel := c.callContext(ctx)
+	defer cancel()
+	return c.client.GetWalletBalance(ctx, req)
+}
+
+func (c *chainGatewayClient) SubmitTransfer(ctx context.Context, req *chainv1.SubmitTransferRequest) (*chainv1.SubmitTransferResponse, error) {
+	ctx, cancel := c.callContext(ctx)
+	defer cancel()
+	return c.client.SubmitTransfer(ctx, req)
+}
+
+func (c *chainGatewayClient) GetTransfer(ctx context.Context, req *chainv1.GetTransferRequest) (*chainv1.GetTransferResponse, error) {
+	ctx, cancel := c.callContext(ctx)
+	defer cancel()
+	return c.client.GetTransfer(ctx, req)
+}
+
+func (c *chainGatewayClient) ListTransfers(ctx context.Context, req *chainv1.ListTransfersRequest) (*chainv1.ListTransfersResponse, error) {
+	ctx, cancel := c.callContext(ctx)
+	defer cancel()
+	return c.client.ListTransfers(ctx, req)
+}
+
+func (c *chainGatewayClient) EstimateTransferFee(ctx context.Context, req *chainv1.EstimateTransferFeeRequest) (*chainv1.EstimateTransferFeeResponse, error) {
+	ctx, cancel := c.callContext(ctx)
+	defer cancel()
+	return c.client.EstimateTransferFee(ctx, req)
+}
+
+func (c *chainGatewayClient) callContext(ctx context.Context) (context.Context, context.CancelFunc) {
+	timeout := c.cfg.CallTimeout
+	if timeout <= 0 {
+		timeout = 3 * time.Second
+	}
+	return context.WithTimeout(ctx, timeout)
+}