About PayPerFax
PayPerFax is a remote MCP server for sending faxes from AI assistants. It prepares a fax and provides a link for a person to review and pay in a browser; no account or API key is required.
Key features
- 01Prepare faxes and return a link
- 02Check fax delivery status
- 03List supported formats and languages
- 04Browser preview and payment
Use cases
- 01Send a written letter as a fax
- 02Submit a signed form or scanned PDF
- 03Check whether a fax was delivered
MCP support
Exposes `create_fax`, `get_fax_status`, and `list_supported_formats` to MCP clients over Streamable HTTP. The person pays in the browser; the assistant does not make the payment.
Configuration
Remote servers need no local install. Pick your client, then copy the config or install in one click.
https://fax.payperfax.com/mcpclaude mcp add --transport http payperfax https://fax.payperfax.com/mcp{"mcpServers":{"payperfax":{"type":"http","url":"https://fax.payperfax.com/mcp"}}}Open in Cursor{"servers":{"payperfax":{"type":"http","url":"https://fax.payperfax.com/mcp"}}}Open in VS Code{"mcpServers":{"payperfax":{"type":"http","url":"https://fax.payperfax.com/mcp"}}}{"mcpServers":{"payperfax":{"serverUrl":"https://fax.payperfax.com/mcp"}}}Run commands in a terminal; paste JSON into the client’s MCP config and restart. Servers that need sign-in will prompt on first connect.
Tools
3| Parameter | Type | Required | Description |
|---|---|---|---|
| to | string | Yes | The fax number in international format: "+", the country code, the number. Example: +14155550101. |
| string | No | The person's email address, for the confirmation and the receipt. Ask the person; do not guess. Required when you send markdown or a cover page. | |
| country | string | No | The person's country as a two-letter code (ISO 3166-1 alpha-2), for example US, DE, GB or JP. It sets the currency of the price, and the date format on the cover page and in the emails. Without it, the price is in US dollars, and the dates have the US format. |
| language | enum | No | The language of the pages that the person sees, and of the emails. The default is en.en | es | de | ja | ko | fr | it |
| markdown | string | No | The document as Markdown text that you wrote, for example a letter. Leave it out when the person has the document as a file. |
| timezone | string | No | The person's time zone as an IANA name, for example America/New_York. Without it, times are shown in UTC. |
| cover_page | boolean | No | true to put a cover page before the document. The default is no cover page. |
| sender_name | string | No | The sender's name on the cover page. Only with cover_page. At most 100 characters. |
| cover_message | string | No | A short note on the cover page, as plain text, at most 5000 characters. Only with cover_page. |
| file_expected | boolean | No | true when the person must still add a file (a PDF, a scan, a signed form). Then the link opens a form with what you sent, and the person adds the file there. |
| recipient_name | string | No | The recipient's name on the cover page. Only with cover_page. At most 100 characters. |
| recipient_company | string | No | The recipient's company or agency on the cover page. Only with cover_page. At most 100 characters. |
Details
From the project READMEPayPerFax MCP server
Send a fax from your AI assistant. Pay per fax. No account, no API key, no subscription.
The assistant prepares the fax. You open the link, see the preview with the price, and pay in the browser. Nothing is sent and nothing is charged before you pay. A fax that fails to transmit is not charged.
https://fax.payperfax.com/mcp
Remote server, Streamable HTTP, no authentication.
Add it to your chat app
- Open the connector settings ("Connectors", "Integrations" or "MCP servers").
- Add a custom MCP server. Name:
PayPerFax. URL:https://fax.payperfax.com/mcp. - Turn the connector on in your chat.
Tell the assistant which country you are in, so the price shows in your currency. The preview, the payment page and the emails can be in English, Spanish, German, French, Italian, Japanese or Korean.
Add it to Gemini CLI
Install the extension from this repository:
gemini extensions install https://github.com/payperfax/fax-mcp --ref main
The extension connects to the hosted PayPerFax MCP server. No account or API key is required.
In Gemini CLI, use /mcp to check the connection and see the three tools.
Add it to Antigravity
The Antigravity plugin package connects to the hosted PayPerFax MCP server. See its installation instructions to install it from a local folder. Marketplace listing is pending.
Tools
| Tool | What it does |
|---|---|
create_fax | Prepares a fax and returns a link. The assistant gives the fax number, your email address, and either a letter it wrote (Markdown) or a notice that a file is still needed |
get_fax_status | Reads the status of a fax: pending (with a stage that says where it is), delivered, failed or expired |
list_supported_formats | Lists the input types, the size limits and the languages |
The assistant never pays. A person pays, in the browser, every time.
Files
MCP does not carry files from a chat app to a server. So:
- The assistant writes the document. The letter goes as Markdown text and becomes the fax.
- You have the file (a signed form, a scan, a PDF). The link opens a pre-filled form. You add the file in the browser.
A coding agent with a shell (Claude Code, Codex, Cursor) can also send a file over HTTP. See the PayPerFax API.
Example: fax a form to the IRS
Fax my signed Form 2848 to the IRS. I'm in the US.
The assistant takes the fax number from irs.gov and shows you the source. It calls create_fax with a notice that a file is expected. You open the link, add the signed PDF, check the number on the preview, and pay.
Always check the number against irs.gov. A wrong number sends tax papers to a stranger. Guide: Fax a form to the IRS with an AI agent.
Documentation
- Fax MCP: overview, price, FAQ
- MCP server reference: tools, fields, rate rules
- Guide for AI assistants
- Pricing
- Security
About this repository
This repository documents the hosted server. The server code is not open source. server.json is the entry in the official MCP registry as com.payperfax/fax.
The files in this public repository are available under the MIT License. That license does not cover the hosted server implementation, which is not included here.
Comments
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