# Research: Messaging Layer Replacement with NATS

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

## Objective

Define the transition from state `005` to `006` by replacing Socket.IO trade-feed messaging with NATS-based messaging.

## Inputs Reviewed

*   `spec.md`
*   `plan.md`
*   `tasks.md`
*   `requirements/functional-delta.md`
*   `requirements/nonfunctional-delta.md`
*   `system/architecture.md`
*   `system/runtime-topology.md`

## Key Decisions

1.  Use NATS subjects for backend pub/sub and frontend streaming integration.
2.  Preserve core trade lifecycle and account-scoped update semantics.
3.  Keep this architecture branch composable with future devex and functional tracks.