Fermat for ChatGPT
xyz.phase.ai/gateway
OpenAI-compatible LLM gateway: pay per request with an API key, signed receipt for each call.
client:ChatGPT
transport:streamable-http
tools:7
Install Fermat in ChatGPT
Settings → Connectors → Advanced → Developer mode
https://mcp.fermat.ai.phase.xyz/mcpCustom connectors are a paid-plan feature and take a remote URL only. ChatGPT cannot run a packaged server locally. ChatGPT docs