DevMargin for ChatGPT

app.devmargin/devmargin

Read-only MCP over your own revenue and net margin across 14 billing rails

client:ChatGPT transport:streamable-http

Install DevMargin in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://devmargin.app/api/mcp

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