prontofax for ChatGPT

com.prontofax/prontofax

Verified US government fax numbers and send a fax from the chat. No account, $2.99 on delivery.

client:ChatGPT transport:streamable-http tools:2

Install prontofax in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://mcp.prontofax.com/mcp

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