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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.

Code source Site web Documentation

Installation

Ajoutez ceci à la configuration MCP de votre client (Claude Desktop : claude_desktop_config.json ; Cursor : .cursor/mcp.json ; VS Code et les autres utilisent la même forme « mcpServers »).

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

Documentation

Tirée du README du projet sur GitHub, actualisée chaque semaine. Les liens ouvrent GitHub.

Sommaire
  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.

Questions fréquentes

Qu'est-ce que PayPerFax ?

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

Comment installer PayPerFax ?

Il fonctionne comme serveur distant. Dans Claude Code : claude mcp add --transport http payperfax 'https://fax.payperfax.com/mcp'. Pour les autres clients, collez la configuration JSON de cette page dans leurs réglages MCP.

Faut-il une clé API pour PayPerFax ?

Son entrée au registre n'indique aucune clé ni secret obligatoire. Certaines fonctions peuvent tout de même demander un compte auprès du service auquel il se connecte.

PayPerFax est-il open source ?

Oui. Son code est sur GitHub sous licence MIT.

Qui maintient PayPerFax ?

Il est publié par payperfax. AI.tn le référence sans le maintenir ni le recommander.

Issu du registre MCP officiel. Être listé n'est pas une recommandation : vérifiez le code et les permissions d'un serveur avant de lui donner accès à vos données.