fourzerotwo-si
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.
Limited machine-readable signal and partial portal coverage — documentation a human can read, but little a machine or agent can consume without scraping.
API Evangelist profiles fourzerotwo-si the way a machine reads it — 75 machine-readable artifacts across 1 API, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — fourzerotwo-si scores 32.9/100 (thin), with a separate agent-readiness read of 34/100 (agent ready). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance. Every facet and dimension name is a link: it opens that measurement's page on APIs.io, where the rating runs across the whole catalog — the exact checks that feed it, how every profiled provider distributes on it, and who is at the top of it.
Kin Score
How this is scored →scored 2026-10-31 · rubric v0.25.0
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How we profile fourzerotwo-si
Each block below is one kind of artifact we hold for fourzerotwo-si. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 67
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
Individual APIs this provider publishes, each with its own machine-readable definition.
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.
fourzerotwo-si Uk Flood API
UK Flood & River Levels: Live flood warnings, flood areas, river, sea and rainfall gauges across England from the Environment Agency.
fourzerotwo-si Uk Food Hygiene API
UK Food Hygiene Ratings: Food hygiene ratings for restaurants, takeaways, shops and caterers across the UK.
fourzerotwo-si Uk Gazette API
UK Gazette Estates: Search UK deceased-estates (probate) notices from The Gazette and pull structured notice detail.
fourzerotwo-si Uk Geography API
UK Geography Codes: How UK areas nest: LSOA, MSOA and parish to ward, local authority, county, region and country, wards to Westminster constituencies, and name search for ONS c...
fourzerotwo-si Uk Legislation API
UK Legislation: Search UK Acts and statutory instruments, read the current (or point-in-time) text of any section, and track amendments.
fourzerotwo-si Uk Parliament Bills API
UK Parliament Bills: Bills before the UK Parliament: search, status, stages, sponsors and publications.
fourzerotwo-si Uk Parliament Members API
UK Parliament Members: MPs and peers: search, biographies, contact details, voting records, constituencies and government posts.
fourzerotwo-si Uk Parliament Votes API
UK Commons Votes: House of Commons divisions: search votes and see how every MP voted.
fourzerotwo-si Uk Planning API
UK Planning Constraints: Is a site in a conservation area, listed, green belt, flood zone, SSSI or under an Article 4 direction? Point-in-polygon checks against 30 planning, her...
fourzerotwo-si Uk Police API
UK Police Data: Street-level crime, outcomes, stop and search, forces and neighbourhood policing for England, Wales and Northern Ireland.
fourzerotwo-si Uk Postcodes API
UK Postcodes: Geocode and describe any UK postcode: coordinates, district, ward, constituency, region.
fourzerotwo-si Uk Property API
UK Property & Area: Sold prices, price summaries, house-price-index revaluations, planning designations, council lookup and a one-call area report for any UK postcode.
fourzerotwo-si Uk Rivers API
UK River Levels, Flow & Rainfall: Environment Agency hydrology gauges across England: river levels and flows (m³/s), rainfall totals and groundwater levels, with 15-minute readi...
fourzerotwo-si Uk Road Safety API
UK Road Collisions: Police-reported road collisions in Great Britain over the last five years: how many near a postcode or point, by severity and year, plus breakdowns by road, ...
fourzerotwo-si Uk Tenders API
UK Public Tenders: UK public-sector tenders and contract awards from Contracts Finder and Find a Tender: search, read a notice, see who won what.
fourzerotwo-si Uk Trade Stats API
UK Trade Statistics: HMRC Overseas Trade Statistics: what the UK imports and exports of any product, from and to which countries, by month or year.
fourzerotwo-si Uk Trade Tariff API
UK Trade Tariff: UK commodity codes, import duties and controls by country of origin, quotas, geographical areas and HMRC monthly customs exchange rates.
fourzerotwo-si Uk Vehicle Tools API
UK Vehicle Tools: Date a UK number plate, work out MOT due dates, vehicle tax (VED) at April 2026 rates and London ULEZ compliance.
fourzerotwo-si Us Spending API
US Federal Spending: US federal contracts, grants and loans from USAspending.gov: search awards by keyword, agency or recipient, read an award, profile a recipient.
fourzerotwo-si Us Treasury API
US Treasury Fiscal Data: US national debt to the penny, average interest rates on Treasury debt, Treasury exchange rates and daily cash balance.
fourzerotwo-si Us Vehicle Safety API
Vehicle Recalls & Safety (NHTSA): US safety recalls, owner complaints and NCAP crash-test ratings by make, model and year.
fourzerotwo-si Us Vehicles API
Vehicle Decoder (NHTSA vPIC): Decode any VIN (worldwide 17-character) and look up makes, models, manufacturers and WMI codes.
fourzerotwo-si Us Weather API
US Weather (NWS): US forecasts, hourly forecasts, active weather alerts and station observations from the National Weather Service.
fourzerotwo-si Validators API
Validators: Check-digit and format validation for IMEIs, VINs, IBANs, UK phone numbers, UK postcodes and email addresses.
fourzerotwo-si Vat API
VAT Rates & Checks: UK and EU27 VAT rates, net↔gross VAT maths, and VAT-number format and check-digit validation.
fourzerotwo-si Web API
Web Reader: Read any public web page as clean markdown, get its link-preview metadata, or check a URL for warning signs before opening it.
fourzerotwo-si World Bank API
World Bank Indicators: GDP, population, inflation, debt, trade, development and climate indicators for every country.
Scroll within the panel for all 67 ·
MCP Servers 1
Model Context Protocol servers expose these APIs directly to AI agents. We profile them because agent-native access is the fastest-growing way this provider's capabilities actually get used.
Model Context Protocol servers that expose these APIs to AI agents.
Agent Skills 1
An agent skill packages the how-to for driving these APIs from an assistant — the prompts, the sequence, the guardrails — so the knowledge to use the API travels with it.
Packaged agent skills for driving this provider's APIs from an AI assistant.
get-airport
AGENT SKILLRate Limits 1
Rate limits are the difference between a demo that works and a production integration that doesn't fall over. Publishing them is an operational-transparency signal — and a hard requirement for any agent that plans its own throughput.
Documented rate limits and quota policies.
Fourzerotwo Si Rate Limits
RATE LIMITSSpectral Rules 1
Governance rulesets we run against this provider's specs — the automated checks behind parts of the score. Profiling them makes the quality bar explicit and re-runnable, not a matter of opinion.
fourzerotwo-si API Rules
SPECTRALSecurity Posture 2
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Scopes 1
OAuth scopes are the vocabulary of least-privilege access. Profiling them shows exactly what an integration — or an agent acting on a user's behalf — is allowed to do.
OAuth scopes governing access to this provider's APIs.
Agentic Access 1
An x-agentic-access contract marks which operations are safe for an agent to run on its own and which need a human in the loop. It is the difference between an API an agent can use and one it can use safely.
Recommended x-agentic-access execution contracts for AI agents.
Resources
Every other property we hold for fourzerotwo-si — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Get Started 1
Portal, sign-up, and the first successful call
Documentation 2
Reference material describing how the API behaves
Agent Surfaces 4
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 4
Pagination, idempotency, versioning, errors, and events
Build 2
SDKs, sample code, and the tooling you integrate with
Access & Security 1
Authentication, authorization, and security posture
Commercial 1
Pricing, plans, and the legal terms of use
Company 2
The organization behind the API
Other 2
Properties that don't map to a standard resource type
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This is an independent, third-party profile of fourzerotwo-si, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.
The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.
Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.
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