Cenogram - Polish Real Estate Transactions (RCN)

Cenogram MCP Server

Polish Real Estate Transaction Data for AI

MCP server for Polish real estate data. Access 8M+ real estate transactions from the national Registry of Prices and Values (Rejestr Cen Nieruchomosci, RCN) directly from Claude, Cursor, or any MCP-compatible AI assistant.

Data source: Polish national RCN registry (Rejestr Cen Nieruchomosci) | Platform: cenogram.pl

Get your API key

1. Go to cenogram.pl/api
2. Enter your email
3. You'll receive your cngrm_... API key by email

Manage your keys at cenogram.pl/ustawienia.

Installation

Pick your client. All options below use the hosted server - no local install needed (except npx/stdio).

claude mcp add cenogram https://mcp.cenogram.pl/mcp \
  -t http -H "Authorization: Bearer YOUR_API_KEY"

{
  "mcpServers": {
    "cenogram": {
      "type": "http",
      "url": "https://mcp.cenogram.pl/mcp",
      "headers": {
        "Authorization": "Bearer YOUR_API_KEY"
      }
    }
  }
}

{
  "mcpServers": {
    "cenogram": {
      "command": "npx",
      "args": ["-y", "@cenogram/mcp-server@latest"],
      "env": {
        "CENOGRAM_API_KEY": "YOUR_API_KEY"
      }
    }
  }
}

{
  "servers": {
    "cenogram": {
      "type": "http",
      "url": "https://mcp.cenogram.pl/mcp",
      "headers": {
        "Authorization": "Bearer YOUR_API_KEY"
      }
    }
  }
}

{
  "mcpServers": {
    "cenogram": {
      "type": "http",
      "url": "https://mcp.cenogram.pl/mcp",
      "headers": {
        "Authorization": "Bearer YOUR_API_KEY"
      }
    }
  }
}

{
  "cenogram": {
    "type": "http",
    "url": "https://mcp.cenogram.pl/mcp",
    "headers": {
      "Authorization": "Bearer YOUR_API_KEY"
    }
  }
}

{
  "mcpServers": {
    "cenogram": {
      "command": "npx",
      "args": ["-y", "@cenogram/mcp-server@latest"],
      "env": {
        "CENOGRAM_API_KEY": "YOUR_API_KEY"
      }
    }
  }
}

Configuration

You can also use the --http CLI flag instead of MCP_TRANSPORT=http.

Tips

• Model selection: For best results, use Claude Opus 4.7. It makes more sequential tool calls and produces richer analysis. You can switch the model in the dropdown at the bottom of the chat window.

Example Prompts

Polish:

• "Jaka jest mediana cen mieszkan w Krakowie w 2025?"
• "Pokaz transakcje z ulicy Pulawskiej 15 na Mokotowie"
• "Znajdz transakcje na dzialce 146518_8.0108.27"
• "Znajdz transakcje gruntow w promieniu 5km od centrum Wroclawia powyzej 500 000 PLN"
• "Porownaj ceny mieszkan na Mokotowie i Woli"
• "Pokaz rozklad cen nieruchomosci w Polsce"

English:

• "What's the median apartment price in Krakow in 2025?"
• "Show transactions at Pulawska 15 in Mokotow"
• "Find all transactions on parcel 146502_8.0901.12 and then search nearby"
• "Find land transactions within 5km of Wroclaw center above 500,000 PLN"
• "Compare apartment prices in Mokotow and Wola districts"
• "Show the price distribution of real estate in Poland"

Tools

Location naming

• Most cities: use the city name directly (e.g., "Gdansk", "Lublin")
• Warsaw: "Warszawa" covers all 18 districts at once; name one ("Mokotow", "Srodmiescie", "Wola") to narrow it down
• Krakow and Lodz work the same way: the city name covers every sub-district, or name one ("Krakow-Podgorze")
• Neighbourhood names are not administrative units - search by radius or polygon instead
• Use list_locations to find valid names

Property types

Workflows

Results include parcel IDs and GPS coordinates, enabling multi-step research:

1. Search by address    -> search_transactions(location="Mokotow", street="Pulawska", buildingNumber="15")
2. Note parcel_id and coordinates from results
3. Search nearby        -> search_by_area(lat=52.19, lng=21.01, radiusKm=2, propertyType="unit")
4. Compare prices       -> get_price_statistics(location="Mokotow")

This mimics how a property appraiser finds comparable transactions for valuation reports.

Data

• 8M+ transactions from all of Poland (380 counties)
• Date range: 2003 - present
• Source: Polish national RCN registry (Rejestr Cen Nieruchomosci)
• Refresh: periodic updates from RCN

Troubleshooting

"Error: CENOGRAM_API_KEY is required" - This only applies to stdio mode. Make sure CENOGRAM_API_KEY is set in the env block of your MCP config. For HTTP remote, the key goes in the Authorization header instead.

npx hangs or fails - Check your Node.js version with node -v. The stdio mode requires Node.js >= 18. If you're on an older version, use the HTTP remote option instead (no Node.js needed).

A location returns 0 results - The name may not be an administrative unit. Districts and neighbourhoods are two different things: "Mokotow" is a district and works, "Sluzew" is a neighbourhood inside it and does not. Use list_locations(search="...") to find valid names, or search by radius (search_by_area) for anything smaller than a district.

401 Unauthorized (HTTP mode) - The Authorization header must be Bearer cngrm_... (with the Bearer prefix). Double-check that the full API key is included, not just the prefix.

Development

git clone https://github.com/cenogram/mcp-server.git
cd mcp-server
npm install
npm test
npm run build

License

MIT