The PromptFax MCP server,
connected in one click.
Send a one-off fax from inside ChatGPT or Claude. Pay-per-use, $2-$4.50 per delivered fax. Connect the official PromptFax MCP server to Claude, ChatGPT, or Cursor through gate — one gateway URL, no config files, security-checked.
Free to start · No credit card · No hosting needed
Add PromptFax to your AI in one minute
Pick your client. Copy, paste, done — or let gate handle sign-ins and policies for you.
claude mcp add --transport http promptfax https://promptfax.app/mcpRun in your terminal, then restart Claude Code.
PromptFax · https://promptfax.app/mcp
What your AI can do with PromptFax
Real prompts you can type the moment it's connected — no setup, no docs to read.
“Use “start_session”: Use this first when a user wants to send or price a fax. PromptFax is built for irregular, pay-per-use outbound faxing: every real send requ.”
“Use “attach_document”: Fallback/non-widget tool for binding a PromptFax document or one or more HTTPS PDF URLs into the current MCP session before requesting a quo.”
“Use “get_quote”: Fallback/non-widget tool for creating a user-reviewable pay-per-use fax quote when you have a fax number and either an MCP session, a Prompt.”
“Use “checkout”: Fallback/non-widget tool for starting external Stripe Checkout after the user accepts a pay-per-use quote. Payment authorization is required.”
How secure is the PromptFax MCP server?
Every server in the gate directory has to pass the same four checks before your AI can touch it. Here's how PromptFax holds up.
Official endpoint
Operated by PromptFax (promptfax.app) at its documented MCP endpoint — not a third-party mirror or community re-host.
No sign-in needed
This server only exposes public data — no account and no credentials are involved when you connect.
Scanned before it goes live
gate checks every tool for prompt injection, hidden instructions, data-exfiltration hints, and over-broad permissions before the server is available through your gateway.
Watched for drift
If PromptFax adds or changes tools later, gate re-scans and alerts you — before your AI acts on the change.
Connected in three steps
Connect your gate
Add one gateway URL to Claude, ChatGPT, or any MCP client. One-time setup, about two minutes.
Pick PromptFax
Choose PromptFax in the gate directory. No sign-in needed.
Use it anywhere
PromptFax's tools are live in every AI client you've connected — with rules and logging built in.
Free to start · No credit card · No hosting needed
The actual tools PromptFax exposes
Fetched live from the official endpoint and re-checked daily by gate — not marketing copy.
start_session — Use this first when a user wants to send or price a fax. PromptFax is built for irregular, pay-per-use outbound faxing: every real send requ
attach_document — Fallback/non-widget tool for binding a PromptFax document or one or more HTTPS PDF URLs into the current MCP session before requesting a quo
get_quote — Fallback/non-widget tool for creating a user-reviewable pay-per-use fax quote when you have a fax number and either an MCP session, a Prompt
checkout — Fallback/non-widget tool for starting external Stripe Checkout after the user accepts a pay-per-use quote. Payment authorization is required
send_fax — Fallback/non-widget tool for sending after payment is authorized and the user explicitly wants to send now. In ChatGPT widget sessions, do n
get_status — Use this when you need the latest PromptFax workflow state, quote/payment state, or fax transmission status.
retry_failed_fax — Use this after a retry-eligible failed fax to queue another attempt under the existing authorization. You may supply a corrected destination
cancel — Use this when you need to cancel the active PromptFax send.
Who runs the PromptFax MCP server?
The PromptFax MCP server at a glance
https://promptfax.app/mcpQuestions, answered
Is there an official PromptFax MCP server?
Yes — PromptFax operates its own remote MCP server at promptfax.app. gate connects you to that official endpoint and adds security scanning, per-tool access rules, and an activity log on top.
How do I connect PromptFax to Claude or ChatGPT?
Add gate's gateway URL to your AI client once, then pick PromptFax in the directory. No account or sign-in is needed. From then on, PromptFax's tools are available in every client you've connected to gate.
Do I need to host anything?
No. PromptFax runs the server, and gate is fully managed. You just connect one URL — there's nothing to install, deploy, or maintain.
Is the PromptFax MCP server safe to connect?
It's the vendor's official endpoint, and gate scans its tools for prompt injection and hidden instructions before it goes live, re-checks it whenever it changes, and lets you allow, block, or require approval for every single tool.
Is it free?
Yes — you can get started with gate for free and connect PromptFax in minutes. No credit card required.
Connect more than just PromptFax
Every server below works through the same gateway URL — connect once, add tools anytime.
Squarespace DomainsDesignView →Set up PromptFax in: Claude · Claude Code · ChatGPT · Cursor · VS Code