AI hosts
CatCaster for ChatGPT & OpenAI Apps
CatCaster exposes a single production MCP server for OpenAI-compatible hosts. ChatGPT Apps SDK packaging is verified against the host matrix before store submission.
- MCP endpoint
- https://www.catcaster.com/api/mcp
- OAuth metadata
- https://www.catcaster.com/.well-known/oauth-protected-resource/api/mcp
- Transport
- Remote MCP (transport per OpenAI Apps / MCP guidance)
Setup
- Confirm your ChatGPT / Apps environment supports remote MCP with OAuth.
- Register the CatCaster MCP URL (no host-specific fork).
- Map required scopes to your workspace via consent.
- Follow the verification checklist in the MCP host matrix before publishing an app listing.
Authentication
Use OAuth 2.1 against the same protected resource metadata as other hosts (`/.well-known/oauth-protected-resource`).
Create or revoke credentials in Settings → Developer (API keys, connected OAuth apps).
Host documentation
Before submitting a ChatGPT App listing, run through the host matrix checklist (tools/list, OAuth revoke, confirmation on publish). Interactive app UI inside ChatGPT is not required for MCP tool access.