lob for ChatGPT

io.usefulapi/lob

Verify US & international addresses and send physical mail (postcards, letters, checks) via Lob.

client:ChatGPT transport:streamable-http

Install lob in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://lob.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