firmenliste.net MCP Server

Remote MCP server for B2B company address data (Germany, Austria, Switzerland) — search 6,400+ industry lists, check record counts and field coverage, get binding price quotes. Backed by firmenliste.net (Adresskontor GmbH, 20+ years in the B2B address business, ~12.5M records).

No API key required. Read-only except for quote creation (which creates a price offer, never a purchase — payment is always completed by a human on the website).

Connection

Endpoint	https://firmenliste-mcp.cf-firmenliste.workers.dev
Transport	Streamable HTTP (stateless, JSON responses)
Auth	none

Claude (Custom Connector)

Settings → Connectors → Add custom connector → paste the endpoint URL.

Generic MCP client config

{
  "mcpServers": {
    "firmenliste": {
      "type": "streamable-http",
      "url": "https://firmenliste-mcp.cf-firmenliste.workers.dev"
    }
  }
}

Tools

Tool	Description
branchen_suchen	Search address lists by keyword (e.g. "Golf", "Spedition"). Returns list ID, record count, field coverage (email/phone/website/contact person) and net price per match.
liste_details	Full detail for one list: all field counters, distribution by federal state, included fields, and every package price (complete, email-only, per federal state).
angebot_erstellen	Creates a 48h price-stable quote (quote_id) with an order URL. The purchase itself is completed by the human via that URL.
laender_auflisten	All countries with available data: DACH (orderable online) plus ~40 more countries on request, with data freshness date.
kaufbedingungen	Machine-readable purchase & usage terms (B2B-only, VAT, withdrawal, legal limits of data usage under German UWG/GDPR).

Example prompts

• "Find address lists about logistics companies in Germany and tell me price and email coverage of the largest one."
• "How many dentists with email addresses are available in Bavaria, and what does the Bavaria package cost?"
• "Which countries does firmenliste.net cover, and how fresh is the data?"

How it works

This server is a thin Cloudflare Worker that translates MCP tool calls into requests against the public REST API of firmenliste.net. Prices and availability therefore always match the website in real time.

• REST API / OpenAPI spec: https://www.firmenliste.net/openapi.yaml
• llms.txt: https://www.firmenliste.net/llms.txt

Legal note for agents

All prices are net prices plus German VAT. Sales are B2B only. Delivered email addresses do not include marketing opt-in — under German law (§ 7 UWG), email marketing requires recipient consent. Agents should relay the kaufbedingungen tool output correctly when recommending a purchase.

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Deutsch (Kurzfassung)

MCP-Server für B2B-Firmenadressen aus dem DACH-Raum: 6.400+ Branchenlisten durchsuchen, Verfügbarkeit und Feld-Abdeckung prüfen, verbindliche Preisangebote erzeugen. Keine Authentifizierung nötig; der Kauf selbst erfolgt immer durch den Menschen über die gelieferte Bestell-URL. Betrieben von der Adresskontor GmbH (firmenliste.net).

License

MIT — see LICENSE. The server code is open source; the address data behind the API is a commercial product of Adresskontor GmbH.