OneSimpleAPI for ChatGPT

com.onesimpleapi/onesimpleapi

Screenshots, PDFs, image editing, QR codes, email validation and more through one hosted MCP server.

client:ChatGPT transport:streamable-http

Install OneSimpleAPI in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://onesimpleapi.com/mcp

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