AI Connector

Send faxes with
your AI assistant

Connect SendFaxFast to Claude, ChatGPT or Grok.
Ask your AI to send a fax — it handles the rest.

Claude
ChatGPT
Grok
Connect now View all tools

Connector URL

Copy this URL and paste it into your AI's MCP connector settings. Works with Claude (desktop app), ChatGPT and Grok.

https://sendfaxfast.com/api/mcp.php

No API key needed for Pay-per-Fax. Subscription users get an API key below for direct sending.

With sign-in (for subscribers)

Add this address instead and your AI app opens a SendFaxFast sign-in page: paste your sff_… key once, or choose “Pay per fax – no account”. The key is not part of the URL, and you can disconnect at any time.

https://sendfaxfast.com/api/mcp-oauth.php

How to connect

1

Claude

In Claude (web or desktop app) open Customize → Connectors → Add custom connector. Paste the URL above. No API key needed to start — just use Pay-per-Fax. Subscribers: paste the sign-in URL (…/api/mcp-oauth.php), click Connect and enter your sff_… key on the SendFaxFast page — or use the connector URL from your key email (with ?key=sff_…).

2

ChatGPT

In ChatGPT (web) enable Settings → Apps → Advanced settings → Developer mode, then create a new app/connector with the URL above and authentication “No authentication”. Subscribers: use the sign-in URL with authentication “OAuth”, or the connector URL from your key email (with ?key=sff_…) and “No authentication”.

3

Grok & Gemini CLI

Go to grok.com/connectors → New Connector → Custom and paste the URL above. Subscribers: use the sign-in URL and complete the sign-in, or the connector URL from your key email (with ?key=sff_…). Gemini CLI: gemini mcp add --transport http sendfaxfast https://sendfaxfast.com/api/mcp-oauth.php.

4

Ask your AI to send a fax

Just say: "Fax this document to +1 212 555 0100" — your AI will handle pricing, payment or quota check, and delivery confirmation. In ChatGPT, attach the PDF, JPG or PNG right in the chat. In Claude, Grok and Gemini, your AI gives you a secure one-time upload link: open it, pick the file or take a photo with your phone, then tell the AI you are done.

Available tools

Your AI assistant can call these 6 functions automatically. Listed with all parameters.

get_fax_price
No key required
Calculate the price for sending a fax before committing to it. Returns price, currency and whether the destination is supported.
fax_numberrequired — Recipient fax number in E.164 format, e.g. +12125550100
pagesoptional — Number of pages (default: 1, max: 100)
"What does it cost to fax 3 pages to +1 212 555 0100?"
create_upload_link
Key optional
Creates a secure one-time upload page for a PDF, JPG or PNG (max. 10 MB, valid for 30 minutes). Your AI shows you the link; you pick the file or take a photo with your phone, and the AI then sends it with send_fax. This step sends nothing and costs nothing.
No parameters required.
"I want to fax a photo of my signed form to +1 212 555 0100"
send_fax
Key optional
Send a PDF, JPG or PNG to a fax number. Without API key: creates a Stripe payment link (Pay-per-Fax, $2.49–$4.99+); the fax is sent automatically after payment. With API key: sends immediately from your credits or subscription quota — no payment step. Needs one of file, upload_id or document_url.
fax_numberrequired — Recipient fax number in E.164 format
fileoptional — The PDF, JPG or PNG you attached in ChatGPT (passed automatically)
upload_idoptional — ID from create_upload_link, after you uploaded the file (Claude, Grok, Gemini)
document_urloptional — Direct, public HTTPS link to a PDF file
emailoptional — Email for payment receipt and delivery confirmation
scheduled_atoptional — ISO 8601 datetime to schedule, e.g. 2026-10-08T09:00:00-05:00
"Fax the contract I just attached to +1 310 555 0199"
get_fax_status
No key required
Check the delivery status of any fax. Returns current status: queued, sending, delivered, failed, scheduled, or cancelled. For Pay-per-Fax orders it also returns the link to the transmission report once the fax is delivered.
tokenoptional — Token from send_fax response (Pay-per-Fax orders)
fax_idoptional — fax_id from send_fax response (subscription orders, requires key)
"Has my fax been delivered?"
get_account_info
Key required
Show your subscription plan details — remaining fax quota, plan type (Mini / Flex / Starter / Business), and current billing period.
No parameters required.
"How many faxes do I have left this month?"
list_fax_history
Key required
List recent faxes from your subscription account with fax number, page count, delivery status, and timestamp.
limitoptional — Number of results (1–50, default: 10)
offsetoptional — Pagination offset (default: 0)
"Show me my last 5 faxes"

Choose how to send

No account needed to start. Subscription unlocks direct sending without payment steps.

No account

Pay-per-Fax

  • From $2.49 per fax
  • USA, Canada, AU, NZ and more
  • Stripe secure checkout
  • No API key needed
  • AI creates the payment link
Mini / Flex

Fax Quota Plan

  • From $7.99 / month
  • 5 or 10 faxes included
  • API key for direct sending
  • No payment step per fax
  • Fax history & scheduling via AI
Starter

Own Fax Number

  • $49.99 / month
  • US / Canada fax number included
  • Send & receive faxes
  • Faxes arrive as PDF by email
  • API key for AI sending
Business

Business Plan

  • $99.99 / month
  • Own fax number + international
  • CRM / ERP integration
  • Priority support
  • API key for AI & automation
Mini / Flex plans Starter & Business plans

Get your API key

Subscription users (Mini or Flex plan) can request their API key here to enable direct fax sending without a payment step per fax. Enter the email address from your subscription — the key is sent to that address.

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