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Faxer — Send Faxes

by faxer.me · remote · no sign-in to list tools · v1.0.0 · published by me.faxer

Send real faxes from AI assistants. Pay per fax ($1 + $0.25/page), no account or API key.

Final · 2
CompareRegistry entry

4 tools: 2 do something that can't be undone and 2 only read.

Scanned Oct 21, 2026

1 check matched something in the tool definitions. No finding is not a safety guarantee. How the checks work.

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

Findings

Matches of fixed checks, with the text they matched.

1 info
  • Infosend_fax

    The description mentions "credential".

    Matched text

    description: "...ayment Token; pay it and retry with the credential in _meta['org.paymentauth/credential']...."

    What this check looks for

Tools

Open a tool for its reasons and full description. Descriptions are the publisher's own words, shown as they are.

4 tools

Can't be undone 2Claude Code: ask
  • create_fax_paymentCreate a Stripe Checkout payment link for a fax.No findings

    Why it is in this group

    • The name "create_fax_payment" says "create": a word for a change.
    • The input addresses people (input.to): what it sends cannot be taken back.
    Description, as the server wrote it
    Create a Stripe Checkout payment link for a fax. Returns payment_url — give this link to the human so they can pay in their browser (agents never handle card details) — and payment_id, which you pass to send_fax after the human has paid. The price is computed server-side from the document or text. The Checkout link expires (see expires_at, ~24h); create a fresh one if the human delays.

    Annotations the server declares

    • readOnlyHint: false
    • destructiveHint: false
    • idempotentHint: false
    • openWorldHint: true
  • send_faxTransmit a fax.1 finding

    Why it is in this group

    • The name "send_fax" says "send": a word for sending, and what is sent cannot be taken back.
    • The input addresses people (input.to): what it sends cannot be taken back.

    Findings

    • Info

      The description mentions "credential".

      Matched text

      description: "...ayment Token; pay it and retry with the credential in _meta['org.paymentauth/credential']...."

      What this check looks for
    Description, as the server wrote it
    Transmit a fax. Two ways to pay: (1) human-in-the-loop — pass the payment_id from create_fax_payment after the human has paid the Stripe Checkout link; (2) autonomous machine payment (x402/MPP) — call WITHOUT payment_id and the server replies with a payment challenge (JSON-RPC error -32042) for USDC-on-Tempo or a Stripe Shared Payment Token; pay it and retry with the credential in _meta['org.paymentauth/credential']. Either way the server verifies the payment covers the server-computed price of the actual content before sending via a real fax carrier. One fax per payment; card/Checkout and Stripe machine payments are refunded automatically if the fax fails to send or deliver (on-chain payments are refunded manually).

    Annotations the server declares

    • readOnlyHint: false
    • destructiveHint: false
    • idempotentHint: false
    • openWorldHint: true
Only reads 2Claude Code: allow
  • get_fax_quoteGet the exact price to send a real fax to any US, Canadian, or international fax number via faxer.me.No findings

    Why it is in this group

    • The name "get_fax_quote" says "get": a word for reading.
    Description, as the server wrote it
    Get the exact price to send a real fax to any US, Canadian, or international fax number via faxer.me. Call this first whenever a user wants to send, transmit, or fax a document or message. Provide document_url (a publicly downloadable PDF), cover_text (plain text that will be rendered onto fax pages), or pages (an estimated page count). Pricing is pay-per-fax ($1.00 first page + $0.25/page, returned in USD cents); no account or API key needed.

    Annotations the server declares

    • readOnlyHint: true
    • openWorldHint: true
  • get_fax_statusCheck the delivery status of a fax sent with send_fax.No findings

    Why it is in this group

    • The name "get_fax_status" says "get": a word for reading.
    Description, as the server wrote it
    Check the delivery status of a fax sent with send_fax. Status 'success' means the receiving fax machine confirmed the transmission; 'inprogress'/'queued' mean it is still sending; 'failure' means it could not be delivered. Delivery typically takes 1-5 minutes; poll roughly every 30 seconds.

    Annotations the server declares

    • readOnlyHint: true
    • openWorldHint: true

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Install

Pinned to version 1.0.0. Values in angle brackets are yours to fill in.

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

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json
{
  "permissions": {
    "allow": [
      "mcp__faxer__get_fax_quote",
      "mcp__faxer__get_fax_status"
    ],
    "ask": [
      "mcp__faxer__create_fax_payment",
      "mcp__faxer__send_fax"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. It assumes the server is installed as faxer. Review it before you use it.