SignThis for ChatGPT

pro.signthis/signthis

Track and send e-signature documents. Needs a SignThis API key; read-only by default.

client:ChatGPT transport:streamable-http

Install SignThis in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://signthis.pro/api/mcp

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