REGON (Polish business register) MCP Server
API key requiredLook up Polish businesses in the GUS REGON register (BIR1) by NIP, REGON, or KRS.
To add REGON (Polish business register) to Claude, run the install command below or copy the ready-made config for Claude Code, Claude Desktop, Cursor and VS Code further down. Restart your client after adding it and its tools show up in your next conversation. It needs 2 environment variables, listed below.
Install
uvx regon-mcp@0.2.2Environment variables
REGON_API_KEYSet in your MCP configREGON_ENVSet in your MCP configInstall with your client
claude mcp add regon-polish-business-register --env REGON_API_KEY=<YOUR_REGON_API_KEY> --env REGON_ENV=<YOUR_REGON_ENV> -- uvx regon-mcp@0.2.2
Run this in a terminal to add the server to Claude Code.
What this does
REGON (Polish business register) exposes a set of tools to Claude over the Model Context Protocol. After you add it to claude_desktop_config.json (snippet above) and restart Claude Desktop, those tools become callable inside any conversation.
Requirements
This server needs the following environment variables to be set before it can run:
REGON_API_KEY REGON_ENV
Set these via the env object in your MCP config (see claude_desktop_config.json snippet above).
Frequently asked questions
How do I install REGON (Polish business register)?
Run the Claude Code command in the install section to add REGON (Polish business register) to Claude Code, or copy the ready-made config for your client from the install section on this page. Restart your client afterwards and the tools appear in your next conversation.
Which clients work with REGON (Polish business register)?
This page carries setup and config for Claude Code, Claude Desktop, Cursor and VS Code. Any other MCP client that accepts a standard server config can connect to REGON (Polish business register) as well.
Does REGON (Polish business register) need an API key?
Yes. Before it can run, set these environment variables: REGON_API_KEY, REGON_ENV. They go in the env block of your MCP config.
Imported from the Official MCP Registry. The details above come from the registry entry; the maker can claim this listing to correct them, add docs, and see its traffic.
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