# Component Spec: nats-broker

> For the complete documentation index, see [llms.txt](https://deploy-preview-472--lucky-concha-f3599f.netlify.app/llms.txt).

## Responsibilities

*   Provide broker-based pub/sub for backend services.
*   Provide websocket-compatible endpoint for browser streaming clients.
*   Support wildcard subscriptions for account-scoped and pricing subjects.

## Covered Flows

*   [`F2`](https://deploy-preview-472--lucky-concha-f3599f.netlify.app/specs/baseline-uncontainerized-parity/system/end-to-end-flows.md#f2-bootstrap-trade--position-blotters) trade submission to processing event chain (with execution price enrichment).
*   [`F4`](https://deploy-preview-472--lucky-concha-f3599f.netlify.app/specs/baseline-uncontainerized-parity/system/end-to-end-flows.md#f4-process-trade-events) real-time account updates + pricing stream to UI.
*   `STARTUP` runtime readiness dependency for event-producing services.

## Requirement Coverage

*   `FR-1002`, `FR-1005`, `FR-1006`, `FR-1009`
*   `NFR-1002`, `NFR-1003`, `NFR-1005`

## Interfaces

*   NATS client: `4222`
*   Monitoring: `8222` (optional debug)
*   Browser websocket (proxied): `/nats-ws`

## Verification

*   `scripts/test-state-008-pricing-awareness-market-data.sh` (to be implemented)