PublicAPIs.io for ChatGPT

io.publicapis/directory

Search 1,500+ public APIs with docs, code and auth/free-tier filters; list or sponsor your API.

client:ChatGPT transport:streamable-http tools:8

Install PublicAPIs.io in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://publicapis.io/mcp

Custom connectors are a paid-plan feature and take a remote URL only. ChatGPT cannot run a packaged server locally. ChatGPT docs