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PayPerFax

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Your AI assistant prepares the fax. You check it and pay in your browser. Pay per fax. No account.

Source code Website Documentation

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

Remote (streamable-http)
Claude Code 
claude mcp add --transport http payperfax 'https://fax.payperfax.com/mcp'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "payperfax": {
            "type": "http",
            "url": "https://fax.payperfax.com/mcp"
        }
    }
}

Documentation

From the project's README on GitHub, refreshed weekly. Links open on GitHub.

Contents
  1. PayPerFax MCP server
  2. Add it to your chat app
  3. Add it to Gemini CLI
  4. Add it to Antigravity
  5. Tools
  6. Files
  7. Example: fax a form to the IRS
  8. Documentation
  9. About this repository

PayPerFax 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

  1. Open the connector settings ("Connectors", "Integrations" or "MCP servers").
  2. Add a custom MCP server. Name: PayPerFax. URL: https://fax.payperfax.com/mcp.
  3. 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

ToolWhat it does
create_faxPrepares 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_statusReads the status of a fax: pending (with a stage that says where it is), delivered, failed or expired
list_supported_formatsLists 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

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.

Frequently asked questions

What is PayPerFax?

Your AI assistant prepares the fax. You check it and pay in your browser. Pay per fax. No account.

How do I install PayPerFax?

It runs as a remote server. In Claude Code: claude mcp add --transport http payperfax 'https://fax.payperfax.com/mcp'. For other clients, paste the JSON configuration from this page into their MCP settings.

Does PayPerFax need an API key?

Its registry entry lists no required key or secret. Some features may still need an account with the service it connects to.

Is PayPerFax open source?

Yes. Its code is on GitHub under the MIT license.

Who maintains PayPerFax?

It is published by payperfax. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.