PaperAgent — Send Physical Mail for ChatGPT

dev.paperagent/letters

Mail one-off USPS letters from ChatGPT or Claude after you approve the preview and price. US only.

client:ChatGPT transport:streamable-http tools:8

Install PaperAgent — Send Physical Mail in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://paperagent.dev/mcp

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