Use FaxFair in Claude and other AI assistants
The FaxFair connector lets an AI assistant such as Claude tell you what a fax costs, give you a faxfair.com link with the fax number already filled in, and find our guides, such as the one with the IRS fax number for your form. You attach the files and pay on faxfair.com, at the website's price. The connector needs no sign-in, and it never sends a fax or takes a payment.
Add the connector
The connector's address is https://api.faxfair.com/connector/mcp. In Claude, add it as a custom connector in your connector settings, with no sign-in. Any assistant that supports remote MCP servers over streamable HTTP can use the same address.
What it can do
- get_fax_price takes a page count and, if you want, a fax number. It answers with the price on faxfair.com, $2.49 for up to 40 pages and $6.99 for 41 to 100, and says whether we can send to that number.
- start_fax takes a US or Canadian fax number. It checks the number and answers with a link to our send form with the number filled in, plus the steps and prices, or says why we can't send to it.
- find_fax_guide takes a question in a few words. It answers with up to 3 of our pages, each with its title, link and summary.
All three only read. None of them sends a fax, uploads a file or charges a card.
Things to ask
- "What does it cost to fax a 55-page lease application with FaxFair?"
- "My fax to a doctor's office keeps failing. What should I check?"
- "I need to fax Form SS-4 to the IRS. Find the fax number and set up the fax on FaxFair."
Sending and paying
The link opens our send form at faxfair.com with the number filled in. There you attach PDFs or photos (PDF, JPG, PNG, WEBP or TIFF; up to 10 files, 40 MB and 100 pages). HEIC photos, the iPhone's default, can't be uploaded, so save them as JPG first. Add a free cover sheet if you want one, and type your name and phone, which US law requires on every page. You see every page before you pay. Checkout places a hold for the price on your card, and we only charge your card when the fax is delivered. If the fax fails, we cancel the payment and you aren't charged. Some banks show the hold as pending for a few days before it drops off.
FaxFair sends to fax numbers in the United States (including Puerto Rico, Guam, the US Virgin Islands, American Samoa and the Northern Mariana Islands) and Canada. For a number in another country, or a premium-rate number such as a 900 number, the connector says we can't send to it.
What we keep
Apart from the IP address each request comes from, we receive only what the assistant puts in the request: a page count, a fax number or a few words of question. We use it to answer that request and don't save it. Our server logs keep two lines for each request. One has the time, the IP address and which address on our server was called. The other has the time, which tool was used and the last 4 digits of a fax number. Neither has the full fax number or the question. We don't receive your files, your account with the assistant or the rest of your conversation. The assistant's own privacy policy covers what it keeps.
The link from start_fax carries the fax number after the # in its address, the part a browser doesn't send when it loads the page. The number stays in your browser history like any link you open. Our privacy policy has the rest.
Help
Questions about the connector or a fax go to FaxFair support.