Welcome

Postel is a library, not a service. It runs inside the host application against the host application's database — Postgres or SQLite — and ships in multiple languages over time. The TypeScript implementation ships first; Go, Python, and Rust follow.

Svix is for when webhooks are your product. Postel is for when webhooks are a feature of your product.

Where to start

• New to Postel? Read Get started — install the receiver, verify your first signed request in under a minute.
• Evaluating the library? Read Why Postel — the positioning, the tradeoffs, and the design rationale.
• Already integrating? Jump to the Concepts (idempotency, key rotation, raw bytes, edge runtimes) or the API reference.

Status

Pre-alpha. @postel/edge (receiver-side) is what ships today: verify, JWKS consumer, dedup helper, multi-secret rotation, raw-bytes-preserving framework adapters. Sender, outbox, retries, fanout, replay land in v0.2.0. Polyglot ports follow.

We document the spec ahead of the implementation. Pages covering unimplemented capabilities are explicit about it — assume nothing ships until the API reference lists it.