Stamped MCP by usefulapi for ChatGPT
io.usefulapi/stamped
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client:ChatGPT
transport:streamable-http
tools:11
Install Stamped MCP by usefulapi in ChatGPT
Settings → Connectors → Advanced → Developer mode
https://stamped.usefulapi.io/mcp
Custom connectors are a paid-plan feature and take a remote URL only. ChatGPT cannot run a packaged server locally. ChatGPT docs