Faxer — Send Faxes

Send a fax with your AI assistant

Faxer runs a free, open MCP server at https://faxer.me/mcp so Claude, ChatGPT, Cursor, and any other MCP-compatible AI agent can send real faxes for you — pay per fax, no account, no subscription.

Connect it

The server speaks Streamable HTTP and needs no API key or sign-up. Endpoint: https://faxer.me/mcp

Claude Code

claude mcp add --transport http faxer https://faxer.me/mcp

Claude.ai / Claude Desktop

Settings → Connectors → Add custom connector, then paste https://faxer.me/mcp.

ChatGPT (Developer Mode)

Settings → Apps & Connectors → Advanced → enable Developer mode, then Create a connector with MCP server URL https://faxer.me/mcp (no authentication). Available on Plus, Pro, Team, and Business plans.

Cursor / other MCP clients

{
  "mcpServers": {
    "faxer": { "url": "https://faxer.me/mcp" }
  }
}

Listed in the official MCP registry as me.faxer/faxer.

Try it — say this to your assistant

• "Fax the PDF at https://example.com/lease.pdf to +1 555 123 4567"
• "Send a fax to +1 800 555 0100 saying my appointment needs to move to Tuesday"
• "Has my fax been delivered yet?"

How a fax gets sent

1. You ask "Fax this PDF to +1 555 123 4567." The agent calls get_fax_quote — the server downloads the document and computes the exact price from its real page count.
2. The agent requests a payment link with create_fax_payment and hands you a Stripe Checkout URL. You pay in your own browser — the agent never sees your card.
3. The agent sends the fax with send_fax. The server verifies your payment covers the server-computed price, then transmits over a real fax network. If transmission fails, you're refunded automatically.
4. Delivery is confirmed via get_fax_status — usually within 1–5 minutes.

Tools

Tool	What it does
get_fax_quote	Exact price for a document URL, text, or page count
create_fax_payment	Stripe Checkout link for the human to pay (one fax per payment)
send_fax	Verifies payment, transmits the fax, refunds on failure
get_fax_status	Real-time delivery status

Pricing

Same as the website: $1.00 for the first page, $0.25 per additional page (USD, via Stripe). No subscription, no account, no connector fee. US, Canadian, and international numbers.

Autonomous agents: pay without a human (x402 / MPP)

Agents with wallets can pay for a fax entirely in-band — no human, no checkout page. Call send_fax without a payment_id and the server replies with a Machine Payments Protocol challenge (JSON-RPC error -32042) priced from the document's real page count. Pay it with USDC on Tempo or a Stripe Shared Payment Token (card/Link), then retry with the credential in _meta["org.paymentauth/credential"]. Clients built on mppx handle this automatically.

Why it's safe

• Human-in-the-loop payment: nothing transmits until a person completes Stripe Checkout in their own browser.
• Server-side pricing: the price is recomputed from the actual document at send time — an agent can't underpay.
• One fax per payment, and failed transmissions are refunded automatically.

FAQ

Can an AI assistant really send a fax for me?

Yes — any assistant that supports MCP connectors (Claude, ChatGPT developer mode, Cursor, and many agent frameworks) can use this server to quote, pay for, and transmit real faxes to any fax number.

Does the agent handle my credit card?

Never. The agent only receives a Stripe Checkout link, which it shows to you. You pay on Stripe's secure page; the agent is told only whether the payment is complete.

What documents can be faxed?

Point the agent at any publicly downloadable PDF (up to 25 MB), or just tell it what to write — plain text is rendered onto professional fax pages (~3,000 characters per page).

What is MCP?

The Model Context Protocol is an open standard, originally introduced by Anthropic, that lets AI assistants call external tools. Faxer's MCP server exposes faxing as a tool any compatible assistant can use.