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fourzerotwo

si.fourzerotwo/data · v1.2.1

400+ data APIs for agents: UK companies, property, trade, tenders, recalls, sanctions. Free tier

Connect Remote server

Terminal
claude mcp add --transport http data https://fourzerotwo.si/mcp --header "X-API-Key: <X_API_KEY>"
~/.cursor/mcp.json
{
  "mcpServers": {
    "data": {
      "url": "https://fourzerotwo.si/mcp",
      "headers": {
        "X-API-Key": "<X_API_KEY>"
      }
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "data": {
      "type": "http",
      "url": "https://fourzerotwo.si/mcp",
      "headers": {
        "X-API-Key": "<X_API_KEY>"
      }
    }
  }
}
Claude Desktop
Settings > Connectors > Add custom connector
URL: https://fourzerotwo.si/mcp

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

Tools 3 found in our last check

  • search_apis

    Find the right data endpoint for a task. Searches 500+ endpoints (UK legislation, Companies House, property prices, sanctions lists, vehicle tax, weather, earthquakes, arXiv/PubMed/Crossref papers, IP geolocation, GB electricity, ONS/World Bank/ECB economics, and more) by keywor…

  • list_apis

    Overview of every API group in the catalog: name, category, summary, number of endpoints and whether it has a free tier. Always free to call. Use it to browse; use search_apis to find a specific endpoint.

  • call_api

    Run one endpoint by the tool name that search_apis returned, with that endpoint's parameters, and get its data back as JSON (with source and licence attribution). Endpoints with free_tier "free" or "sample" cost nothing within the daily allowance (100 calls/day anonymously, 500…

Headers

NameDescription
X-API-Key
Optional, secret
Optional free key from https://fourzerotwo.si/free (raises the free allowance from 100 to 500 calls/day)

Details

Endpointhttps://fourzerotwo.si/mcp (Streamable HTTP)
First published11 Oct 2026
Last updated11 Oct 2026
Registry namesi.fourzerotwo/data

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