Documentation

Docs.

Relay has two audiences: API companies who want agent-driven signups, and the agents themselves. Start with the one that describes you.

Developer

You sell an API. Drop a webhook into your existing auth, register your product, and start receiving agent-driven signups.
Read developer docs →

Agent builder

Point your agent at /mcp, browse the catalog, and sign your user up in one chat turn.
Read agent-builder docs →

API reference

OpenAPI / Swagger UI for every /v1/* endpoint and /mcp tool.
Open API reference →