fourzerotwo MCP Server

by fourzerotwo Your server? Claim it

answering

fourzerotwo is answering right now. Last checked 9 min ago. It exposes 3 tools.

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

Uptime history 4 hours of history

4 hours agonow

100.0%

Uptime 24h

14 of 14 checks

Tools

read from the server

306 ms

Response time

average over 24h

open, no key

Access

streamable-http

Nothing serious here today

Today is the operative word: we check fourzerotwo every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 9 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add data --transport http https://fourzerotwo.si/mcp

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "data": {
      "url": "https://fourzerotwo.si/mcp"
    }
  }
}

~/.codex/config.toml

[mcp_servers.data]
url = "https://fourzerotwo.si/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "data": {
      "url": "https://fourzerotwo.si/mcp"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "data": {
      "url": "https://fourzerotwo.si/mcp"
    }
  }
}

Available tools 3

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

apis

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.

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 keyword and returns each match's tool name, parameters, price and free_tier. Always free to call. Next step: pass a returned tool name to call_api.

call

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 with a free key). Otherwise the result is a payment request: pay in USDC via x402 and retry with _meta["x402/payment"]. Invalid arguments are rejected before any charge, and failed upstream calls are never charged.

Endpoints

URL	Transport	State	Latency	Checked
https://fourzerotwo.si/mcp	streamable-http	answering	365 ms	9 min ago

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fourzerotwo — questions

Answers built from our own checks of this server.

What can fourzerotwo do?

It exposes 3 tools, read directly from the server on our last check. Among them: call_api, list_apis, search_apis. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is fourzerotwo working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 14 of 14 checks got a reply (100.0%), average response time 306 ms. The bar chart above shows every period we have measured.

How do I connect fourzerotwo?

Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does fourzerotwo need an API key?

No. fourzerotwo completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 3 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is fourzerotwo?

It answers our handshake in 306 ms on average, which is faster than 47% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.