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SendThisFax

by sendthisfax.com · remote · no sign-in to list tools · v1.0.0 · published by com.sendthisfax

Send real faxes to EU institutions: pay per fax via checkout link or prepaid API key.

Final · 1
CompareRegistry entry

4 tools: 1 do something that can't be undone and 3 only read.

Scanned Oct 21, 2026

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

claude mcp add --transport http fax https://www.sendthisfax.com/mcp

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 1Claude Code: ask
  • send_faxSubmit an uploaded PDF for faxing.No findings

    Why it is in this group

    • The name "send_fax" says "send": a word for sending, and what is sent cannot be taken back.
    Description, as the server wrote it
    Submit an uploaded PDF for faxing. Step 1 (before this tool): upload the PDF over plain HTTP multipart, using any HTTP client you have — shell, JavaScript fetch with FormData, Python, etc.: curl -F "file=@document.pdf" https://www.sendthisfax.com/api/upload fetch("https://www.sendthisfax.com/api/upload", {method: "POST", body: formDataWithFile}) The response contains fax_public_id and page_count. PDFs must be unencrypted, at most 50 MB and 1000 pages. Step 2: call this tool with the fax_public_id and the recipient fax number. Two modes: - With an API key (Authorization: Bearer stf_live_... on this MCP connection): the fax price is debited from the prepaid credit balance and sending starts immediately — no checkout, no browser. sender_email and billing_country are optional (they default to the key's records). Buy credits at https://www.sendthisfax.com/en/credits. - Without an API key: sender_email and billing_country are REQUIRED and the tool returns a checkout_url the USER must pay in a browser; the fax is sent automatically once paid. In both modes, poll get_fax_status until status reaches "delivered" or "failed" (failures after payment are auto-refunded). For integration testing, +19898989898 is the designated test recipient number.

    Annotations the server declares

    • destructiveHint: false
    • idempotentHint: false
    • openWorldHint: true
    • readOnlyHint: false
    • title: Send a fax
Only reads 3Claude Code: allow
  • check_balanceGet the prepaid credit balance of the API key used to authenticate this MCP connection.No findings

    Why it is in this group

    • The description's first verb is "get": a word for reading.
    Description, as the server wrote it
    Get the prepaid credit balance of the API key used to authenticate this MCP connection. Requires a bearer API key (stf_live_...). Buy or top up credits at https://www.sendthisfax.com/en/credits — credits never expire and failed faxes are re-credited automatically.

    Annotations the server declares

    • openWorldHint: false
    • readOnlyHint: true
    • title: Check credit balance
  • get_fax_statusGet the current status of a 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
    Get the current status of a fax. Poll this after send_fax until a terminal state. Fax lifecycle: draft (uploaded, not submitted) -> pending (submitted, awaiting payment) -> sending -> delivered | failed. Payment lifecycle: unpaid -> verifying/open (checkout in progress) -> paid | failed | canceled | expired. A fax that fails after payment is refunded automatically to the payer.

    Annotations the server declares

    • openWorldHint: false
    • readOnlyHint: true
    • title: Get fax status
  • get_priceGet the price quote in euro cents for sending a fax.No findings

    Why it is in this group

    • The name "get_price" says "get": a word for reading.
    Description, as the server wrote it
    Get the price quote in euro cents for sending a fax. Pricing: 5.00 EUR for up to 5 pages, plus 0.50 EUR per extra page, plus VAT based on the payer's billing country (0% VAT outside the EU).

    Annotations the server declares

    • openWorldHint: false
    • readOnlyHint: true
    • title: Get fax price quote

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 fax https://www.sendthisfax.com/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__fax__get_price",
      "mcp__fax__get_fax_status",
      "mcp__fax__check_balance"
    ],
    "ask": [
      "mcp__fax__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 fax. Review it before you use it.