GRAIN is a Nostr relay and an importable Go client library, with a web frontend that doubles as the reference client. Start here and follow the path for what you're doing.

• installation.md — install from a binary, source, or Docker; the data directory, first-run setup, and running GRAIN as a service (systemd / Windows NSSM / macOS launchd).
• configuration.md — the full configuration reference: server, rate limits, whitelist / blacklist, event purging, relay metadata, and the hot-reload system.
• docker/readme.md — Docker and docker-compose deployment.

• client-library-guide.md — the importable client/core engine: the outbox model, automatic routing, streaming fetches, the pluggable Signer / Logger / RelayListStore seams, and runnable examples.
• api.md — the relay's HTTP API (OpenAPI / Swagger UI), served live by every relay at /api/docs.

• development/readme.md — development environment, the Docker build system, code standards, and the release process.
• ../tests/readme.md — the integration test suite and test-environment tooling.

The API reference is generated from the code — every running relay serves its own Swagger UI at <relay>/api/docs (raw spec at /api/docs/openapi.json).