fourzerotwo
400+ data APIs for agents: UK companies, property, trade, tenders, recalls, sanctions. Free tier
Should I use this
Quality & Safety
Based on automated analysis of tool definitions and protocol compliance.
Context Cost
This is the approximate number of tokens consumed each time the server's tools are loaded into a model's context. Higher counts reduce the attention available for other tasks.
Install
One-Click Install
Add this to your `claude_desktop_config.json` file:
{
"mcpServers": {
"data": {
"url": "https://fourzerotwo.si/mcp"
}
}
}Remote endpoints
https://fourzerotwo.si/mcpstreamable-httpWhat it can do
Tool inventory
Tools (3)
🟢search_apis(query, category, limit)
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.
Input Schema
{
"type": "object",
"properties": {
"query": {
"type": "string",
"description": "Keywords describing the data you need; every word must match. Examples: \"postcode\", \"sanctions screen\", \"sold prices\", \"earthquake\", \"bank holiday\"."
},
"category": {
"type": "string",
"description": "Optional category filter, e.g. \"legal\", \"property\", \"finance\", \"research\", \"energy\", \"network\". See list_apis for all categories."
},
"limit": {
"type": "integer",
"minimum": 1,
"maximum": 50,
"default": 20,
"description": "Maximum results (default 20)."
}
},
"additionalProperties": false
}Output Schema
{
"type": "object",
"properties": {
"total": {
"type": "integer"
},
"results": {
"type": "array",
"items": {
"type": "object",
"properties": {
"tool": {
"type": "string"
},
"api": {
"type": "string"
},
"endpoint": {
"type": "string"
},
"description": {
"type": "string"
},
"category": {
"type": "string"
},
"price_usd": {
"type": "string"
},
"free_tier": {
"type": [
"string",
"null"
],
"enum": [
"free",
"sample",
null
]
},
"params": {
"type": "array"
}
},
"required": [
"tool",
"api",
"endpoint",
"price_usd"
]
}
}
},
"required": [
"total",
"results"
]
}🟢list_apis(category)
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.
Input Schema
{
"type": "object",
"properties": {
"category": {
"type": "string",
"description": "Optional category filter, e.g. \"property\"."
}
},
"additionalProperties": false
}Output Schema
{
"type": "object",
"properties": {
"categories": {
"type": "array",
"items": {
"type": "string"
}
},
"apis": {
"type": "array",
"items": {
"type": "object",
"properties": {
"slug": {
"type": "string"
},
"name": {
"type": "string"
},
"category": {
"type": "string"
},
"summary": {
"type": "string"
},
"endpoints": {
"type": "integer"
},
"free_tier": {
"type": "boolean"
}
},
"required": [
"slug",
"name",
"category",
"endpoints"
]
}
}
},
"required": [
"categories",
"apis"
]
}🟢call_api(tool, arguments)
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.
Input Schema
{
"type": "object",
"properties": {
"tool": {
"type": "string",
"pattern": "^[a-z0-9-]+__[a-z0-9-]+$",
"description": "Endpoint tool name from search_apis, e.g. \"uk-postcodes__lookup\" or \"sanctions__screen\"."
},
"arguments": {
"type": "object",
"description": "The endpoint's parameters as listed in search_apis results, e.g. {\"postcode\": \"SW1A 1AA\"}.",
"additionalProperties": true
}
},
"required": [
"tool"
],
"additionalProperties": false
}Output Schema
{
"type": "object",
"description": "The endpoint's JSON response. Proxied sources return {data, source{name, licence, attribution}}; first-party endpoints return their own documented object. List responses are wrapped as {result: [...]}.",
"additionalProperties": true
}Community
Evidence