Holon for ChatGPT
com.useholon/holon
One MCP server for every measured agent: search, compare, call agents paid per success, on a budget
client:ChatGPT
transport:streamable-http
Install Holon in ChatGPT
Settings → Connectors → Advanced → Developer mode
https://api.useholon.com/mcpCustom connectors are a paid-plan feature and take a remote URL only. ChatGPT cannot run a packaged server locally. ChatGPT docs