AI Fax Credits

Send Faxes with
Claude, ChatGPT & Grok

Buy prepaid fax credits once. Use them anytime in your favorite AI assistant. No subscription, no registration — just pay and fax.

📠
5
Fax Credits
$11.99
$2.40 per fax
Best Value
⚡
10
Fax Credits
$19.99
$2.00 per fax — save 17%
🏆
20
Fax Credits
$34.99
$1.75 per fax — save 27%

If a fax fails, your credit is refunded automatically.

Credits never expire  ·  Instant delivery by email  ·  Secure payment by Stripe

Instant API Key
After payment, your API key and your personal connector URL arrive by email in seconds. Paste the URL into Claude, ChatGPT or Grok and start faxing.
Worldwide Faxing
Send to the USA, Canada, Australia, New Zealand and 39 more countries, including the UK, Germany, France and Switzerland. 1 credit = 1 fax.
Delivery Confirmation
You receive an email when the fax is delivered. If it fails, your credit is automatically refunded.

How it works

Set up in 2 minutes

1

Buy Credits

Choose a package above and pay securely via Stripe. Your API key and your personal connector URL (the key is already built in) are emailed instantly.

2

Add your connector URL

Copy the personal connector URL from your email. It looks like https://sendfaxfast.com/api/mcp-credits.php?key=sfx_…. In Claude (web or desktop app) go to Customize → Connectors → Add custom connector, paste it and click Add. In Grok: grok.com/connectors → New Connector → Custom. Keep the URL private, because it contains your key.

3

Fax with a Sentence

Tell your AI: "Fax this document to +1 212 555 0100", then confirm. 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. 1 credit is deducted per fax.

4

Delivery Confirmation

You receive an email when the fax is delivered. If delivery fails, your credit is refunded automatically.

FAQ

Common Questions

Do credits expire?
No. Fax credits never expire. Use them whenever you need.
Does it work with ChatGPT?
Where your ChatGPT plan allows custom apps: turn on Developer mode (ChatGPT on the web: Settings → Apps → Advanced settings), create an app with your personal connector URL and choose “No authentication”. Some plans only allow read-only tools, so sending may not be available there yet. Claude and Grok work with the same URL.
Can I upload a PDF or image in the chat?
Yes. 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. Files can be up to 10 MB and 100 pages. Photos and images are turned into a fax-ready PDF automatically. An upload link works once and is valid for 30 minutes. A direct, public https link to a PDF works too.
What if the fax fails?
If Telnyx (our carrier) reports a final delivery failure, your credit is refunded automatically to your account. You can then retry with the same API key.
How long is 1 credit?
1 credit covers 1 complete fax transmission — any number of pages, up to 100 pages. There is no per-page charge.
Which countries are supported?
The USA, Canada, Australia, New Zealand and 39 more countries, the same list as on sendfaxfast.com: Belgium, Brazil, Bulgaria, Chile, Colombia, Croatia, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, India, Ireland, Israel, Italy, Japan, Latvia, Lithuania, Luxembourg, Malaysia, Mexico, Netherlands, Norway, Peru, Poland, Portugal, Romania, Singapore, Slovakia, Slovenia, South Korea, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Premium-rate numbers (for example 1-900 or 0900 numbers) are not supported. German 0180 service numbers work.
Is there a subscription?
No subscription. You pay once and use credits as you need them. For high-volume faxing (monthly plans with more faxes), see our Subscription Plans.