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

config.json

{
  "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.

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.