fourzerotwo

Call a data API

call_api

Read-onlyIdempotent

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 (50 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

TableJSON Schema

Name	Required	Description	Default
`tool`	Yes	Endpoint tool name from search_apis, e.g. "uk-postcodes__lookup" or "sanctions__screen".
`arguments`	No	The endpoint's parameters as listed in search_apis results, e.g. {"postcode": "SW1A 1AA"}.

Output Schema

TableJSON Schema

Name	Required	Description	Default
No arguments

Schema Changelog

Changes observed during successful MCP inspections.

Changed6 schema fields changedOct 11, 2026

addedInput schema / additionalProperties
```
Added value: +false
```
addedInput schema / properties / arguments / additionalProperties
```
Added value: +true
```

changedInput schema / properties / arguments / description

Previous value: -"The endpoint's parameters"New value: +"The endpoint's parameters as listed in search_apis results, e.g. {\"postcode\": \"SW1A 1AA\"}."

changedInput schema / properties / tool / description

Previous value: -"Tool name from search_apis, e.g. \"uk-police__street-crime\""New value: +"Endpoint tool name from search_apis, e.g. \"uk-postcodes__lookup\" or \"sanctions__screen\"."

addedInput schema / properties / tool / pattern
```
Added value: +"^[a-z0-9-]+__[a-z0-9-]+$"
```

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "additionalProperties": true,
+  "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: [...]}.",
+  "type": "object"
+}

First observedOct 11, 2026

TDQS

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