# fourzerotwo data API gateway

**Canonical:** https://apis.io/apis/fourzerotwo-si/fourzerotwo-data-api-gateway/  
**Provider:** fourzerotwo-si — https://apis.io/providers/fourzerotwo-si/  
**Base URL:** https://fourzerotwo.si  
**Documentation:** https://fourzerotwo.si

fourzerotwo data API gateway is one of 67 APIs that [fourzerotwo-si](https://apis.io/providers/fourzerotwo-si/) publishes on the [APIs.io](https://apis.io/) network. Tagged areas include Data, API, AI, Payments, and MCP.

Pay-per-call data APIs for AI agents: 547 endpoints across 66 APIs covering UK company, property, legal and public-sector data, economics, research, web and domain tools. Every endpoint is a plain HTTPS GET that may return HTTP 402 with x402 payment requirements (USDC) and is served via a single MCP server. Most calls are free within a daily allowance; paid calls are billed per request.

## Machine-readable artifacts (1)

- **APIsJSON** — https://artifacts.apis.io/fourzerotwo-si/apis.yml

## Other fourzerotwo-si APIs (12)

- [fourzerotwo-si Airports API](https://apis.io/apis/fourzerotwo-si/fourzerotwo-si-airports-api/)
- [fourzerotwo-si Arxiv API](https://apis.io/apis/fourzerotwo-si/fourzerotwo-si-arxiv-api/)
- [fourzerotwo-si Bank Of England API](https://apis.io/apis/fourzerotwo-si/fourzerotwo-si-bank-of-england-api/)
- [fourzerotwo-si Bathing Water API](https://apis.io/apis/fourzerotwo-si/fourzerotwo-si-bathing-water-api/)
- [fourzerotwo-si Calculators API](https://apis.io/apis/fourzerotwo-si/fourzerotwo-si-calculators-api/)
- [fourzerotwo-si Clinical Trials API](https://apis.io/apis/fourzerotwo-si/fourzerotwo-si-clinical-trials-api/)
- [fourzerotwo-si Companies House API](https://apis.io/apis/fourzerotwo-si/fourzerotwo-si-companies-house-api/)
- [fourzerotwo-si Crossref API](https://apis.io/apis/fourzerotwo-si/fourzerotwo-si-crossref-api/)
- [fourzerotwo-si Domains API](https://apis.io/apis/fourzerotwo-si/fourzerotwo-si-domains-api/)
- [fourzerotwo-si Earthquakes API](https://apis.io/apis/fourzerotwo-si/fourzerotwo-si-earthquakes-api/)
- [fourzerotwo-si Ecb API](https://apis.io/apis/fourzerotwo-si/fourzerotwo-si-ecb-api/)
- [fourzerotwo-si Eu Tenders API](https://apis.io/apis/fourzerotwo-si/fourzerotwo-si-eu-tenders-api/)

## Tags

Data, API, AI, Payments, MCP

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/fourzerotwo-si/fourzerotwo-data-api-gateway/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/fourzerotwo-si/.