fourzerotwo MCP server

Which MCP servers are fourzerotwo's own, from the official registry and from asking its own domain, whether they answer, and what they offer. A program checked each of these, nobody copied them from a product page.

read 2026-10-27

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Whose server it is

Registry namesi.fourzerotwo/dataverified in the MCP registry

The registry name sits under fourzerotwo.si. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

When we asked itchecked 2026-10-27

Stateanswerschecked 2026-10-27
Tools3
Server calls itselffourzerotwo
Server version1.1.0
Protocol version2025-06-18

On 2026-10-27 the server answered initialize and tools/list without a sign-in. First answer in 515 ms.

Should an agent connect itNot proven either way yet

Whether its tools do the product's job has not been judged yet.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

Measured dailydaily checks: 8, the first on 2026-10-27

INITE MCP score100 of 100answers 100 · definitions 100 · context 100 · connects 100
Answered100% of days8 of 8 daily checks
Median first answer578 ms
Space in an agent's context≈ 605 tokensthe definitions of all its tools (3), which an agent carries on every turn
Tool definitionsA · 100 of 100
Typed results3 of 3 toolsdeclared outputSchema: results come typed, read once

Every tool passes all six checks.

What an agent can do with it

not sure · look up customs commodity codes from product descriptions
cannot · check remaining tariff quota balances by country of origin
not sure · compare third-country duties for goods by origin country

Each of the product's use cases, put to Jev against this server's tool list: can an agent do it with these tools?

Worth a look

None of the five warning signs in these definitions.

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (25%), doing the product's job (25%), definitions (20%), context (10%), use (10%) and how readily a client connects (10%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

Tools it offers3 tools · read 2026-10-27

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…
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…

How to connect

Add the server to your MCP client config. Claude Desktop, Cursor and most other clients read this shape:

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

Add it

Claude Code, in a terminal

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

Add to Cursor Add to VS Code

claude.ai, ChatGPT and other clients: add https://fourzerotwo.si/mcp as a custom connector in the settings.

Other servers listed as fourzerotwo's

si.fourzerotwo/environmentanswers, 64 toolsverified in the MCP registry
si.fourzerotwo/healthanswers, 29 toolsverified in the MCP registry
si.fourzerotwo/researchnot asked yetverified in the MCP registry
si.fourzerotwo/safety-recallsnot asked yetverified in the MCP registry
si.fourzerotwo/toolsnot asked yetverified in the MCP registry
si.fourzerotwo/trade-procurementnot asked yetverified in the MCP registry
si.fourzerotwo/transportnot asked yetverified in the MCP registry
si.fourzerotwo/uk-businessnot asked yetverified in the MCP registry
si.fourzerotwo/uk-propertynot asked yetverified in the MCP registry
si.fourzerotwo/uk-public-servicesnot asked yetverified in the MCP registry
si.fourzerotwo/webnot asked yetverified in the MCP registry

OpenAPI spec

547 paths, read 2026-10-27. Open the spec ↗

Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.