Postbye for ChatGPT

com.postbye/postbye

Read-only cancellation guides, mailing addresses and letters for thousands of subscriptions.

client:ChatGPT transport:streamable-http tools:4

Install Postbye in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://postbye.com/mcp

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