VRChat Web API
The HTTP API at api.vrchat.cloud/api/1 that backs the VRChat client and the vrchat.com website — authentication, users, friends, worlds, avatars, instances, groups, files and notifications. VRChat operates this API publicly but explicitly does not document it, publish a machine-readable specification for it, or support third-party use of it. The only first-party guidance is the API section of the Creator Guidelines, which sets User-Agent, rate-limit and credential-handling rules for anyone who calls it anyway. The unauthenticated /api/1/config endpoint returns 200 with JSON and is the surface probed for this profile.