Compabase

🇵🇱 Polish Companies MCP Server – Compabase

Compabase MCP is a Model Context Protocol server that gives AI assistants – Claude, Cursor, Windsurf, VS Code, and any MCP-compatible client – direct access to 3 million+ Polish companies from the KRS (National Court Register) and CEIDG registries, plus financials, people, rankings, and public-register enrichments (SUDOP, BZP, TED, URE, BDO, GPW, KRZ, CRBR, MSiG, EU funds).

Ask in plain language. The model maps prompts to structured tools over Streamable HTTP (JSON-RPC 2.0).

Quick Start

You can connect without a key. The agent signs you up and writes mcpk_… into the client config after email confirmation.

Cursor / Windsurf / VS Code – .cursor/mcp.json (or the equivalent MCP JSON):

{
  "mcpServers": {
    "compabase": {
      "url": "https://compabase.com/api/mcp"
    }
  }
}

Then ask the agent to sign you up (request_signup with your email). After you click the magic link, poll check_signup until status: ready. Restart the client if it does not hot-reload MCP config.

Claude Desktop – claude_desktop_config.json (after you have a key):

{
  "mcpServers": {
    "compabase": {
      "url": "https://compabase.com/api/mcp",
      "headers": {
        "Authorization": "Bearer mcpk_YOUR_KEY_HERE"
      }
    }
  }
}

Claude.ai (Web / Mobile Connectors):

• Go to Settings → Connectors → Add Custom Connector
• URL: https://compabase.com/mcp?apiKey=mcpk_YOUR_KEY_HERE
• Authentication: None (Detected) (key is passed in URL)

Keys can also be created in Integrations → MCP. MCP keys (mcpk_…) are separate from REST API keys (cb_…).

Example prompts

• Find active IT companies in Warsaw with revenue over 5 million PLN.
• What is the latest revenue and net profit of Allegro?
• List board members of the company with KRS 0000028860.
• How many active companies in mazowieckie have primary PKD starting with 62?
• What is the median revenue in PKD section J?
• Is Orlen listed on GPW? What is the ticker and P/E?

Available tools

Live traffic is always POST https://compabase.com/api/mcp with method: tools/call and params.name set to the tool name. Identify a company with name, krs, or nip when a tool accepts them. Monetary filters default to PLN.

Full schemas: mcp.yaml · interactive docs.

Onboarding (no key)

Company data

Register enrichments

Account (skip mcp_queries)

Quota

Data tools (search, financials, enrichments, SQL): each successful tools/call consumes one mcp_queries unit.

Account tools skip mcp_queries. export_companies consumes export_companies instead.

initialize, tools/list, and ping do not consume quota. Limits reset with the billing period.

See compabase.com/pricing.

Protocol

Related

• Compabase REST API – OpenAPI 3.1 (v1.yaml)
• Interactive API docs
• Interactive MCP docs
• compabase.com

License

MIT

Gemini CLI

gemini extensions install https://github.com/ContentWriterco/Compabase-MCP

On first use Gemini CLI opens the Compabase sign-in page (OAuth). Run /mcp auth compabase if it does not.

Claude Code plugin

This repository is also a Claude Code plugin (MCP server + skill):

/plugin marketplace add ContentWriterco/Compabase-MCP
/plugin install compabase@compabase-plugins

Setup guides

Step-by-step setup guides for Claude, ChatGPT, Gemini, Grok, Le Chat, Perplexity, Cursor, VS Code and Claude Code: https://compabase.com/docs/mcp/connect/