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SofortFax MCP server

Which MCP servers are SofortFax's own, from the official registry and from asking its own domain, whether they answer, and what they offer. A program checked each of these, nobody copied them from a product page.

read 2026-10-27

← Back to SofortFax

Whose server it is
  • Registry namede.sofortfax/faxverified in the MCP registry

The registry name sits under sofortfax.de. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

When we asked itchecked 2026-10-27
  • Stateanswerschecked 2026-10-27
  • Tools4
  • Server calls itselfSofortFax
  • Server version1.0.0
  • Protocol version2025-06-18

On 2026-10-27 the server answered initialize and tools/list without a sign-in. First answer in 174 ms.

Should an agent connect itNot proven either way yet
  • Whether its tools do the product's job has not been judged yet.
  • Checked on 1 of the 7 days it takes to judge reliability.

Once connected

  • Keep approval on for send_fax: they delete, send or pay without saying so.
  • send_fax, create_upload_link change data without a sign-in: anyone with the address can call them.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

Measured dailydaily checks: 1, the first on 2026-10-27
  • INITE MCP scoreafter a weeka score needs 7 daily checks: 1 so far
  • Answeredmeasuring1 of the 7 daily checks it takes to print a share
  • Median first answer690 ms
  • Space in an agent's context≈ 869 tokensthe definitions of all its tools (4), which an agent carries on every turn
  • Tool definitionsA · 100 of 100
  • Typed results0 of 4 toolsdeclared outputSchema: results come typed, read once
  • Every tool passes all six checks.

Worth a look

  • Tools that delete, send or pay, marked as not destructive: send_fax
  • Tools that change data, on a server that answers without a sign-in: send_fax, create_upload_link

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (25%), doing the product's job (25%), definitions (20%), context (10%), use (10%) and how readily a client connects (10%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

Tools it offers4 tools · read 2026-10-27
  • get_fax_price

    Zeigt den Preis für ein Fax (Pay per Fax, Endpreise, gemäß §19 UStG ohne Umsatzsteuer) und prüft, ob die Faxnummer erlaubt ist. Sendet nichts.

  • send_fax

    Bereitet ein echtes Fax über SofortFax vor und liefert einen sicheren Stripe-Bezahllink (2,49 € – 4,99 €). Das Fax wird erst nach der Zahlung gesendet. Vorher dem Nutzer Faxnummer, Dokument und ggf. Sendezeitpunkt bestätigen lassen…

  • get_fax_status

    Liefert den Status eines Faxes (Zahlung ausstehend, geplant, wird gesendet, zugestellt, fehlgeschlagen, storniert) und nach Zustellung den Link zum Sendebericht.

  • create_upload_link

    Erstellt einen sicheren Einmal-Upload-Link (30 Minuten gültig) für das Fax-Dokument: PDF, JPG, PNG oder direkt ein Foto mit der Handykamera, max. 10 MB. Der Nutzer öffnet upload_url und lädt die Datei hoch; danach send_fax mit der…

How to connect

Add the server to your MCP client config. Claude Desktop, Cursor and most other clients read this shape:

{
  "mcpServers": {
    "fax": {
      "type": "http",
      "url": "https://sofortfax.de/api/mcp.php"
    }
  }
}

Add it

Claude Code, in a terminal

claude mcp add --transport http sofortfax https://sofortfax.de/api/mcp.php

Add to CursorAdd to VS Code

claude.ai, ChatGPT and other clients: add https://sofortfax.de/api/mcp.php as a custom connector in the settings.

Other servers listed as SofortFax's
  • de.sofortfax/fax-creditsanswers, 6 toolsverified in the MCP registry
  • de.sofortfax/fax-oauthanswers, requires sign-inverified in the MCP registry

Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.