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Polish KYB

Official registry Other

Know-your-business checks for Polish companies: KRS, owners, insolvency, sanctions, gazette notices.

Source code Website Documentation

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

Remote (streamable-http)
Claude Code 
claude mcp add --transport http polish-kyb 'https://compabase.com/api/mcp/kyb' --header 'Authorization: <Optional: Bearer mcpk_… key from https://compabase.com/integrations?tab=mcp. Clients with OAuth support can sign in instead.>'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "polish-kyb": {
            "type": "http",
            "url": "https://compabase.com/api/mcp/kyb",
            "headers": {
                "Authorization": "<Optional: Bearer mcpk_… key from https://compabase.com/integrations?tab=mcp. Clients with OAuth support can sign in instead.>"
            }
        }
    }
}

Documentation

From the project's README on GitHub, refreshed weekly. Links open on GitHub.

Contents
  1. Polish KYB MCP Server
  2. Tools
  3. Example prompts
  4. Authentication
  5. Setup
  6. About
  7. Gemini CLI
  8. Setup guides

Polish KYB MCP Server

Verify Polish business partners in one place: registry profile, management and shareholders, beneficial owners, insolvency and restructuring, court gazette notices, sanctions lists and financial supervision licences.

Remote MCP server (Streamable HTTP), read-only, hosted by Compabase.

https://compabase.com/api/mcp/kyb

Tools

ToolWhat it does
search_companies / get_companyFind the company and read its KRS registry profile and VAT status.
get_company_people / get_company_beneficiariesManagement board, supervisory board, shareholders and beneficial owners (CRBR).
get_company_debt_registryInsolvency and restructuring proceedings (KRZ).
get_company_court_gazetteCourt and Commercial Gazette (MSiG) notices.
get_company_sanctions / get_company_financial_supervisionSanctions lists and KNF financial supervision register.
get_company_secured_liabilities / get_company_articlesSecured liabilities and articles of association.

Example prompts

  • Run a KYB check on the company with NIP 5260250995.
  • Who are the beneficial owners of KRS 0000028860?
  • Is this company in insolvency proceedings or on a sanctions list?

Authentication

Sign in with your Compabase account (OAuth) in clients that support it, or send an MCP key: create one at https://compabase.com/integrations?tab=mcp and pass it as Authorization: Bearer mcpk_… or append ?apiKey=mcpk_… to the URL. Queries count toward your Compabase plan.

Setup

Claude (claude.ai, Desktop): Settings → Connectors → Add custom connector → paste the URL above (add ?apiKey=mcpk_… if you use a key).

Cursor / VS Code / Windsurf (mcp.json):

{
  "mcpServers": {
    "polish-kyb": {
      "url": "https://compabase.com/api/mcp/kyb",
      "headers": { "Authorization": "Bearer mcpk_YOUR_KEY" }
    }
  }
}

ChatGPT: Settings → Apps → Developer mode → Create → paste the URL.

About

Part of the Compabase MCP family. Full Compabase MCP (all Polish company data tools): https://compabase.com/api/mcp.

Questions: contact@compabase.com

Gemini CLI

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

Gemini CLI asks for your Compabase MCP key during installation (create one at https://compabase.com/integrations?tab=mcp).

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/

Frequently asked questions

What is Polish KYB?

Know-your-business checks for Polish companies: KRS, owners, insolvency, sanctions, gazette notices.

How do I install Polish KYB?

It runs as a remote server. In Claude Code: claude mcp add --transport http polish-kyb 'https://compabase.com/api/mcp/kyb' --header 'Authorization: <Optional: Bearer mcpk_… key from https://compabase.com/integrations?tab=mcp. Clients with OAuth support can sign in instead.>'. For other clients, paste the JSON configuration from this page into their MCP settings.

Does Polish KYB need an API key?

Yes. It expects Authorization, which you set in its configuration.

Is Polish KYB open source?

Yes. Its code is on GitHub under the MIT license.

Who maintains Polish KYB?

It is published by ContentWriterco. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.