# fourzerotwo-si

**Canonical:** https://apis.io/providers/fourzerotwo-si/  
**Website:** https://fourzerotwo.si/  
**APIs profiled:** 1

fourzerotwo provides pay-per-call data APIs for AI agents, offering 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 returns HTTP 402 with x402 payment requirements (USDC) and a tool on a single MCP server. Most calls are free within a daily allowance; paid calls are billed per request. The service is hosted at https://fourzerotwo.si and includes documentation via llms.txt and an OpenAPI spec.

## Kin Score — 32.9 / 100 (thin)

Scored 2026-10-31 under rubric 0.25.0.

| Facet | Score |
|---|---|
| Discoverability | 66.7 |
| Contract Quality | 53.4 |
| Contract Governance | 22.0 |
| Operational Transparency | 5.3 |
| Developer Ergonomics | 23.1 |
| Access Clarity | 23.7 |

Regulatory layer — **Payments**: 20.8 (matched via tags).

## Agent readiness — 33.7 (agent-ready)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| Reversibility Documented | no |
| MCP Server | documented |
| Auth Clarity | bearer |
| Idempotency | no |
| Error Semantics | derived |
| OpenAPI Examples | verified |
| Rate Limit Signal | documented |
| Event Surface Described | no |
| Agent Skills | unknown |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |
| Delegated Identity | no |
| Protected Resource Metadata | no |
| Dynamic Client Registration | no |
| Agentic Commerce | no |
| Pagination Ratio | na |
| Operation Distinctiveness | distinct |

## APIs (67)

- **fourzerotwo data API gateway** — 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 ...
- **fourzerotwo-si Airports API** — Airports Worldwide: Every airport, airfield and heliport worldwide: ICAO/IATA codes, location, elevation, runways, radio frequencies and nearby navaids — look up by code, search...
- **fourzerotwo-si Arxiv API** — arXiv Papers: Search arXiv preprints and get clean metadata and abstracts, plus the newest papers in AI, ML, NLP, physics, finance and more.
- **fourzerotwo-si Bank Of England API** — Bank of England Rates: Bank Rate, SONIA, sterling exchange rates, gilt yields and average UK mortgage and loan rates.
- **fourzerotwo-si Bathing Water API** — Bathing Water Quality: Every designated bathing water in England — beaches, lakes and river swimming sites — with its latest classification (excellent to poor), today's pollutio...
- **fourzerotwo-si Calculators API** — Calculators: Currency conversion at ECB reference rates, UK business-day maths with official bank holidays, and postcode-to-postcode distance.
- **fourzerotwo-si Clinical Trials API** — Clinical Trials (ClinicalTrials.gov): Search 500,000+ registered clinical studies by condition, drug, sponsor, place, status and phase; full study records and recruitment counts.
- **fourzerotwo-si Companies House API** — UK Companies House: Every UK company: search, profile, status, registered office, filings, charges and insolvency.
- **fourzerotwo-si Crossref API** — Crossref DOI Metadata: Resolve DOIs to bibliographic metadata and search scholarly works, journals and funders.
- **fourzerotwo-si Domains API** — Domains & DNS: Is a domain available, who registered it and when, its DNS records, and how well its email is authenticated (SPF, DMARC, MX).
- **fourzerotwo-si Earthquakes API** — Earthquakes (USGS): Worldwide earthquakes in near real time: recent feeds, regional search and counts.
- **fourzerotwo-si Ecb API** — ECB Rates: Euro foreign exchange reference rates, ECB policy rates, €STR and euro area inflation.
- **fourzerotwo-si Eu Tenders API** — EU Public Tenders (TED): Every EU public procurement notice from TED: search by keyword, buyer country, CPV code and date; competitions and awards with winners.
- **fourzerotwo-si Eurostat API** — Eurostat: Official EU statistics: GDP, inflation, unemployment, population, house prices and any Eurostat dataset.
- **fourzerotwo-si Federal Register API** — US Federal Register: US federal rules, proposed rules, notices and presidential documents: search and detail.
- **fourzerotwo-si Gb Electricity API** — GB Electricity Grid: Live and forecast Great Britain electricity data: generation mix, demand, wind, prices, interconnectors, margins, frequency and plant outages.
- **fourzerotwo-si Gleif API** — Global LEI Register: Legal Entity Identifiers worldwide: lookup, name search, corporate parents and children, ISIN and BIC mapping.
- **fourzerotwo-si Global Weather API** — Global Weather (MET Norway): Worldwide weather forecasts, sunrise, sunset and moon phase, and ocean forecasts for any point.
- **fourzerotwo-si Holidays API** — World Public Holidays: Public holidays for ~40 countries and their regions, is-it-a-holiday checks and business-day maths.
- **fourzerotwo-si Imei API** — IMEI & TAC decoder: Validate an IMEI and decode it to brand, model and device type from our own TAC database.
- **fourzerotwo-si Ip Geolocation API** — IP Geolocation & ASN: IP address to country, continent, network owner (ASN) and a hosting/cloud flag, for IPv4 and IPv6.
- **fourzerotwo-si London Transport API** — London Transport: Live Tube, bus, rail and road status, arrivals, journey planning and bike docks across London.
- **fourzerotwo-si Nhs Organisations API** — NHS Organisations (ODS): Every NHS organisation and site: GP practices, pharmacies, trusts, ICBs, dental and optical practices, with codes, roles, addresses and relationships.
- **fourzerotwo-si Openfda API** — openFDA: US drug labels, adverse events and recalls, medical device events, recalls and clearances, and food recalls.
- **fourzerotwo-si Product Recalls API** — Product Recalls & Safety Alerts: UK and US product recalls, food allergy alerts, medicine and medical-device alerts, and UK air, marine and rail accident reports.
- **fourzerotwo-si Pubmed API** — PubMed: Search 37M+ biomedical citations and fetch article summaries from PubMed.
- **fourzerotwo-si Ror API** — Research Organisations (ROR): Identify universities, research institutes, funders and hospitals: search, match messy affiliation strings, look up by GRID/ISNI/Wikidata/Funder ID.
- **fourzerotwo-si Rxnorm API** — RxNorm Drug Names: Normalise US drug names: name or misspelling to RxCUI, clinical and branded drugs, ingredients and brands, NDC lookups and concept properties.
- **fourzerotwo-si Sanctions API** — Sanctions Screening: Fuzzy-screen a person, company or vessel against the US OFAC SDN, UK, EU and UN sanctions lists in one call.
- **fourzerotwo-si Scholarly API** — Scholarly Works (OpenAlex): Search 250M+ papers, authors, institutions, journals and topics with citation counts.
- **fourzerotwo-si Schools API** — Schools in England: Every school and education establishment in England: type, phase, ages, pupils, free school meals, trust, address and location — search by name, postcode or ...
- **fourzerotwo-si Sec Edgar API** — SEC EDGAR: US public company filings and XBRL financials: submissions, company facts, single concepts and cross-company frames.
- **fourzerotwo-si Sec Tickers API** — SEC Ticker Map: Every US-listed ticker mapped to its company name and SEC CIK.
- **fourzerotwo-si Seo API** — SEO Tools: On-page SEO audit of any URL, link extraction, robots.txt rules for any crawler, and keyword intent.
- **fourzerotwo-si Tides API** — US Tides & Water Levels: NOAA tide stations across US coasts and the Great Lakes: high and low tide predictions, observed water levels and current station weather (water and air...
- **fourzerotwo-si Time API** — Time Zones & Business Days: DST-aware time-zone conversion that flags ambiguous and skipped local times, zone facts with the next clock change, and business days for 40+ countries.
- **fourzerotwo-si Uk Bank Holidays API** — UK Bank Holidays: Official bank holidays for England & Wales, Scotland and Northern Ireland.
- **fourzerotwo-si Uk Business API** — UK Company Due Diligence: One call: a UK company's register status, overdue filings, late accounts, recent name and office changes, Gazette insolvency notices, LEI and a sanctio...
- **fourzerotwo-si Uk Disputes API** — UK Consumer Disputes: Parking appeals, energy back-billing, broadband/mobile and water disputes with cited law, deadlines and escalation routes, plus a verified complaints-conta...
- **fourzerotwo-si Uk Economy API** — UK Economic Indicators: Latest ONS headline figures: inflation, jobs, wages, GDP, retail sales, public debt and trade.
- …and 27 more, listed in full on the page.

## MCP servers (1)

- **fourzerotwo-si MCP Server** — Remote MCP server at fourzerotwo.si.

## Agentic access (1)

- **Fourzerotwo Si Agentic Access** — 547 operations

## Security (2)

- **Fourzerotwo Si Authentication** — 0 schemes
- **Fourzerotwo Si Domain Security** — TLSv1.3 · HSTS

## Tags

Company, Data, API, AI, Payments, MCP

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/fourzerotwo-si/). Scores are computed from the provider's own public artifacts under a published rubric.