PromptFax for ChatGPT

app.promptfax/promptfax

Send a one-off fax from inside ChatGPT or Claude. Pay-per-use, $2-$4.50 per delivered fax.

client:ChatGPT transport:streamable-http tools:8

Install PromptFax in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://promptfax.app/mcp

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