# API catalog (RFC 9727)

Check id `api-catalog-rfc9727` · Discoverability · runs in the deep scan · pre-release, in calibration

**What we look for.** Whether /.well-known/api-catalog (RFC 9727) lists your APIs.

**Why it matters.** It shows an agent your whole API surface in one request.

**How to pass.** Serve /.well-known/api-catalog as a linkset that points to each API's description and docs.

This check needs a deep scan, which the hosted monitor will run.