400+ data APIs for agents: UK companies, property, trade, tenders, recalls, sanctions. Free tier
Connect Remote server
claude mcp add --transport http data https://fourzerotwo.si/mcp --header "X-API-Key: <X_API_KEY>"
{
"mcpServers": {
"data": {
"url": "https://fourzerotwo.si/mcp",
"headers": {
"X-API-Key": "<X_API_KEY>"
}
}
}
}
{
"servers": {
"data": {
"type": "http",
"url": "https://fourzerotwo.si/mcp",
"headers": {
"X-API-Key": "<X_API_KEY>"
}
}
}
}
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_apisFind 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_apisOverview 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_apiRun 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
| Name | Description |
|---|---|
X-API-KeyOptional, secret | Optional free key from https://fourzerotwo.si/free (raises the free allowance from 100 to 500 calls/day) |
Details
| Endpoint | https://fourzerotwo.si/mcp (Streamable HTTP) |
| First published | 11 Oct 2026 |
| Last updated | 11 Oct 2026 |
| Registry name | si.fourzerotwo/data |
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