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SendThisFax MCP Server

by sendthisfax Your server? Claim it
answering

SendThisFax is answering right now. Last checked 8 min ago. It exposes 4 tools.

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

Uptime history 91 days of history · worst day 92%
91 days agonow
100.0%
Uptime 24h
91 of 91 checks
4
Tools
read from the server
219 ms
Response time
average over 24h
open, no key
Access
streamable-http

SendThisFax missed one check this week

Everything else answered, so this is steady rather than shaky. We check every 15 minutes, which is how a one-off gets told apart from the start of a pattern, and how you hear about the next one within the hour instead of from your users.

Three servers free · no card

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 8 min ago.

run in your terminal
claude mcp add fax --transport http https://www.sendthisfax.com/mcp
Settings → Connectors → Add custom connector, then paste this address
https://www.sendthisfax.com/mcp
~/.codex/config.toml
[mcp_servers.fax]
url = "https://www.sendthisfax.com/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "fax": {
      "url": "https://www.sendthisfax.com/mcp"
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "fax": {
      "type": "http",
      "url": "https://www.sendthisfax.com/mcp"
    }
  }
}

Available tools 4

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

balance
check_balance
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.
fax
get_fax_status
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.
price
get_price
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).
send
send_fax
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 "[email protected]" 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.

Endpoints

URLTransportStateLatencyChecked
https://www.sendthisfax.com/mcp streamable-http answering 186 ms 8 min ago

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SendThisFax — questions

Answers built from our own checks of this server.

What can SendThisFax do?
It exposes 4 tools, read directly from the server on our last check. Among them: check_balance, get_fax_status, get_price, send_fax. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →
Is SendThisFax working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 219 ms. The bar chart above shows every period we have measured.
How do I connect SendThisFax?
Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.
Does SendThisFax need an API key?
No. SendThisFax completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 4 of them are readable on this page. This is what we observed, not what the docs claim.
How fast is SendThisFax?
It answers our handshake in 219 ms on average, which is faster than 62% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.