Polish Open Data (unofficial)

io.github.JacekSmi/PolishOpenData · v1.7.0

Polish registers: KRS, VAT, bank checks, parcels, geocoding, property prices (RCN), optional REGON.

Website Source code Set it up

Connect Runs on your machine

Terminal

claude mcp add polishopendata -e POLISHOPENDATA_OFFLINE_DIR=<POLISHOPENDATA_OFFLINE_DIR> -e POLISHOPENDATA_REGON_KEY=<POLISHOPENDATA_REGON_KEY> -- dnx PolishOpenData.Mcp --yes

claude_desktop_config.json

{
  "mcpServers": {
    "polishopendata": {
      "command": "dnx",
      "args": [
        "PolishOpenData.Mcp",
        "--yes"
      ],
      "env": {
        "POLISHOPENDATA_OFFLINE_DIR": "<POLISHOPENDATA_OFFLINE_DIR>",
        "POLISHOPENDATA_REGON_KEY": "<POLISHOPENDATA_REGON_KEY>"
      }
    }
  }
}

~/.cursor/mcp.json

{
  "mcpServers": {
    "polishopendata": {
      "command": "dnx",
      "args": [
        "PolishOpenData.Mcp",
        "--yes"
      ],
      "env": {
        "POLISHOPENDATA_OFFLINE_DIR": "<POLISHOPENDATA_OFFLINE_DIR>",
        "POLISHOPENDATA_REGON_KEY": "<POLISHOPENDATA_REGON_KEY>"
      }
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "polishopendata": {
      "type": "stdio",
      "command": "dnx",
      "args": [
        "PolishOpenData.Mcp",
        "--yes"
      ],
      "env": {
        "POLISHOPENDATA_OFFLINE_DIR": "<POLISHOPENDATA_OFFLINE_DIR>",
        "POLISHOPENDATA_REGON_KEY": "<POLISHOPENDATA_REGON_KEY>"
      }
    }
  }
}

Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.

Tools

This server runs locally, so its tools are listed by your MCP client once it starts.

Environment variables

Name	Description
`POLISHOPENDATA_OFFLINE_DIR` Optional	Folder for the prepared VAT whitelist flat-file indexes used by check_vat_bank_account_offline (a local disk, not a network share). Default: PolishOpenData/BialaListaOffline under the user's local application data folder.
`POLISHOPENDATA_REGON_KEY` Optional, secret	Optional. Your own free GUS BIR key ([email protected]); enables the lookup_regon tool. Stays on your machine.

Details

Package	`[email protected]` (NUGET, stdio)
First published	5 Nov 2026
Last updated	5 Nov 2026
Registry name	`io.github.JacekSmi/PolishOpenData`

More finance and crypto servers See all

Live status

Local install

Installed and run on your own machine, so there is no public endpoint to check.

Pair it with live search

Agents that use Polish Open Data (unofficial) often also need current facts. NestDaddy MCP gives your AI today's internet: web search, real-time breaking news and full page reading in one connector.

See NestDaddy MCP

For maintainers

[![NestDaddy MCP](https://nestdaddy.com/mcp/servers/io-github-jaceksmi-polishopendata/badge.svg)](https://nestdaddy.com/mcp/servers/io-github-jaceksmi-polishopendata)

Add the badge to your README. It turns green while your server passes our daily check. Listing details come from the official MCP registry; update them there.

Listing data from the official MCP registry. Status and tools from NestDaddy's daily check. Browse all MCP servers.