Skip to main content

​
Base URL

​
Authentication

All endpoints (except /health) require a Bearer token:
Keys start with rail_. Generate yours from the dashboard.

​
Endpoints

​
Error codes

Error responses are flat, not nested — error is a plain string, with code and any endpoint-specific fields alongside it, not inside it:
Not every error includes a code — some (mostly 400s) return just {"error": "..."}. Credits are metered fire-and-forget rather than pre-flight-blocked, so 402 is defined in the SDKs but rarely returned in practice today.