# API Market Finder

> An OpenAPI registry: every entry has an HTML page, a markdown mirror, an llms.txt and a downloadable OpenAPI 3.1 schema.

Registered 45 APIs.

## APIs

- [Accessible Transit Boarding Info API](/apis/accessible-transport-board/): Does the next bus or train at this stop have accessible low-floor boarding? Arriving at a stop only to find the next vehicle cannot lower or the platform has no step-free access is a common frustration for mobility aid users.
- [Test Merchant API for AI Shopping Agents API](/apis/ai-shopping-agent-sandbox/): Developers building AI shopping agents have no real storefront to test against during development. Stripe test mode provides test-only payment data but not a full mock merchant catalog to exercise browsing and purchase flows.
- [Broadband Availability at Postcode API](/apis/broadband-availability/): Developers need to check what broadband and fibre speeds are actually available at a given postcode, but the data only exists behind a manual web checker. Ofcom's Broadband Checker is a manual web form only, with no programmatic endpoint, and bulk data requires large annual downloads.
- [Building Permit Data by City and Date API](/apis/building-permit-feed/): Get building permit records for lead gen; data is public but buried in inconsistent city open-data portals. There is no unified query, so pulling permits means wrestling each city's separate portal.
- [Construction Material Embodied Carbon API](/apis/carbon-embodied/): I need the embodied carbon of a construction material in kg CO2e to compare building options. Buildings are chosen on operational energy, but embodied carbon in materials is often a large share of lifetime impact and is rarely compared.
- [SSL Certificate Expiry Check API](/apis/cert-expiry-check/): Teams want to alert before a site's TLS certificate expires but there is no trivial lookup endpoint. Every developer re-implements socket-based certificate inspection for the same task. Qualys SSL Labs grades SSL configuration but is a point-grading tool rather than a simple expiry-lookup API for programmatic use.
- [City and Community Events Calendar API](/apis/community-events-calendar/): Pull upcoming city and community events (parades, festivals, council meetings); municipal sites rarely expose an API, forcing scraping. Developers who need events from local government calendars usually end up writing scrapers that break whenever a site changes.
- [Company Charges Register Lookup API](/apis/company-charges-register/): Lenders and diligence tools want a company's registered charges, but the charges register is searched through the Companies House website with no clean structured lookup. Companies House charges search lets you browse charge details on the website, and full charge documents are not exposed as a simple lookup.
- [UK Company Solvency Check API](/apis/company-solvency-snapshot/): Is this UK company solvent? Show me its net assets and current ratio from its latest accounts. Trade credit decisions need a fast read of whether a company is solvent, but full accounts are dense and time-consuming to digest.
- [Verify Contractor License Status by State API](/apis/contractor-license-check/): Verify a contractor's license is active before hiring; every state board publishes data differently, mostly as hard-to-query portals. There is no unified API, so checking a license means visiting each board's site.
- [Unified Court Records and Docket API](/apis/court-docket-records/): Look up court cases, dockets, and filings without paying per-document; records sit behind fragmented, paywalled court systems. PACER charges per page and offers no clean bulk API, while CourtListener is free but has limited coverage and no live docket streaming.
- [When to Plant Vegetables API](/apis/crop-sowing-calendar/): I need a planting and sowing calendar by crop and location to build a garden planner. Knowing when to sow a crop depends on local frost dates and soil temperature, which vary even within a county, and guessing costs a failed germination.
- [Deployment Risk Gate API](/apis/deploy-gate/): How do I stop a bad deployment before it reaches production? Rollouts are often gated by human sign-off that lags behind the pipeline, so a failed canary can sit live for minutes while watchers are offline.
- [Dimensional Weight DIM Shipping Calculator API](/apis/dimensional-weight-calc/): Shipping and e-commerce code must compute dimensional (volumetric) weight, but each carrier applies different DIM divisors and rules, so developers re-implement the logic and miss oversized items. Errors cause unexpected charges at checkout.
- [Drug Safety Alerts and Recalls API](/apis/drug-safety-alerts/): Pharmacy and health platforms need to surface current drug safety alerts and recalls, but MHRA publishes them as filterable web articles with only an RSS feed. There is no structured API for querying by medicine name or status, so developers must scrape or manually track updates.
- [EPC Rating Lookup by Postcode API](/apis/epc-rating-lookup/): Property and letting software needs an energy certificate rating for a single address, but single-property lookup is portal-only and bulk data needs an account. The Energy Performance Certificate Register lets you search a single property through a web portal, and bulk CSV/API access requires a GOV.UK One Login account.
- [UK Farm Gate Commodity Prices API](/apis/farm-gate-prices/): I need current prices farmers are paid for wheat, cattle and vegetables in the UK. Small farmers sell at wholesale prices they learn about too late, and a weekly price signal helps them decide whether to hold or sell a crop.
- [UK Company Filing Deadline Dates API](/apis/filing-reminder/): When is this UK company's next accounts and confirmation statement deadline? Companies miss statutory filing deadlines because reminders sit in inboxes that go unread, and a single view of upcoming deadlines per company would reduce late filings.
- [Food Hygiene Rating Lookup API](/apis/food-hygiene-rating/): Food-delivery and review apps want a hygiene rating for a restaurant, but ratings are only searchable through the FSA's public web portal. The FSA Food Hygiene Ratings portal provides a public search page, and the underlying ratings data has no simple stable per-business API.
- [India GST Number GSTIN Validation API](/apis/gstin-validation/): Indian e-commerce and invoicing apps must verify 15-character GSTIN numbers, but the government GSTN portal has no friendly public API, so platforms re-implement regex and lookup logic. This risks accepting invalid or blacklisted tax numbers.
- [GTIN Barcode Validation and Lookup API](/apis/gtin-barcode-check/): E-commerce apps need to validate GTIN/UPC/EAN barcodes and resolve the GS1 prefix and product info, but validators are just libraries and the official GS1 data is not machine-readable. The GS1 official parsers ship as a C library only, and official GS1 data is not exposed as a hosted lookup API.
- [UK HMO Licensing Rules API](/apis/hmo-checklist/): What HMO licensing rules apply to a property in this council area? Rules for houses in multiple occupation differ by council and change often, so landlords miss requirements and face fines because they cannot track what applies.
- [Income Tax Calculation and Reporting API](/apis/income-tax-calculator/): Compute exact tax owed for an individual or business; no reliable public engine exists and commercial ones are locked down. Intuit/TurboTax keeps its calculation engine closed rather than exposing a general API, and IRS Free File offers no public calculation or filing API for developers.
- [UK Lease Extension Term Calculator API](/apis/lease-renewal-calc/): How many years are left on my flat lease and what would extending to 199 years give? Flat owners facing a lease extension are unsure how much longer their lease will last, and the maths is specific and easy to get wrong.
- [Vehicle Load and Bin Packing API](/apis/load-builder/): How do I pack parcels into a van without exceeding weight and volume limits? Filling a vehicle is done by feel in many small operations, leaving either wasted space or overloaded axles.
- [Neighbourhood Quality Scores by Postcode API](/apis/local-area-index/): How good is this area for transport, schools and noise before I move? A property is only as good as its surroundings, but those factors are described in scattered places, and home movers want one view of a neighbourhood.
- [Image Clip Licence Terms Lookup API](/apis/media-licence-lookup/): I need the licence terms and commercial-use flag for a stock image or clip I want to reuse. Reusing an image or clip requires knowing its licence, but licence terms are buried in provider pages and often copied into metadata inconsistently.
- [Mobile Coverage Lookup by Postcode API](/apis/mobile-coverage-lookup/): Apps that depend on connectivity want mobile and 5G coverage for a location, but Ofcom only offers a manual postcode checker with no API. There is no programmatic postcode lookup, so developers cannot answer connectivity questions in code.
- [Planning Application Search by Postcode API](/apis/planning-application-search/): Developers and buyers want planning applications near an address, but each council exposes them only through its own web portal with no unified API. Hundreds of separate council web portals exist with no single programmatic register across authorities.
- [Product Price Comparison API](/apis/price-comparison/): How do I compare this product's price across merchants? Shoppers find different prices, bundles and postage for the same product, and comparing them manually is tedious and error-prone.
- [Similar Property Listings Matching API](/apis/property-listing-similarity/): Which nearby listings are comparable to this property, and how similar are they? Buyers see one listing at a time and cannot tell if the asking price is in line with similar homes, because descriptions vary wildly in how they describe the same things.
- [Property Title and Ownership Lookup API](/apis/property-title-ownership/): Legal and diligence workflows need to confirm who owns a property, but HM Land Registry title searches sit behind a paid business e-services portal. HM Land Registry e-services require a paid business account and offer no free programmatic title lookup across the register.
- [Accurate Real Estate Listings Data API](/apis/real-estate-listings-data/): Get reliable, current real estate listings; data is fragmented and full of expired or inaccurate entries. Zillow is restricted with no public listing data API, and Realtor.com offers no general developer API for listing data.
- [Rental Price Estimate for a Property API](/apis/rental-valuation/): What is a fair monthly rent for this flat based on its features and nearby comparables? Landlords and renters guess at fair rent, while regional lists are averages that ignore the specifics of a unit and paid valuations are slow.
- [Restaurant Health Inspection Scores by Zip API](/apis/restaurant-health-score/): Where can I check a restaurant's health inspection grade? Scores are buried in fragmented local government portals, one city at a time. There is no national or zip-level lookup, so consumers cannot compare hygiene at a glance.
- [Property Sale Price Lookup API](/apis/sale-price-lookup/): Mortgage and valuation apps want the recent sale price of a house or street, but Land Registry only publishes it as huge monthly bulk downloads. HM Land Registry's Price Paid Data is a monthly bulk text/CSV only, updated on the 20th working day, with no per-postcode lookup API.
- [Step-free Accessible Route Planner API](/apis/step-free-route/): Show me a route between two places that avoids all stairs and steps. Wheelchair users and people with luggage need to know a route avoids stairs, but standard journey planners only flag steps at one station, not along the whole path.
- [UK Supplier Verification API](/apis/supplier-registry/): Is this supplier real and what are its verified company and VAT identifiers? Procurement teams need to confirm a supplier exists and see its verified identifiers before onboarding, but manual verification across registers is slow.
- [UK Sort Code and Account Validation API](/apis/uk-sort-code-check/): UK fintech and invoicing apps must validate 6-digit sort codes and 8-digit account numbers, but there is no free authoritative sort-code-to-bank lookup, so developers hand-roll format checks. This leads to false payments and failed direct debits.
- [EU VAT Number Validation API](/apis/vat-validation/): Websites selling to EU businesses must verify VAT numbers, but the official VIES service is slow, SOAP-based, rate-limited, often returns no result and is offline during nightly maintenance, so developers hunt for a dependable wrapper.
- [VIN Decoder API Return Vehicle Make Model Year API](/apis/vin-decode/): Developers building vehicle apps (auctions, valuations, insurance) need to send a 17-character VIN and get back make, model, year, engine and dimensions. Existing free services only cover US vehicles, so teams serving other markets cannot rely on them.
- [Visa Requirements by Nationality API](/apis/visa-requirements/): Does a traveller from this country need a visa for that destination? Travellers piece together visa rules from forum posts and stale pages, and a structured lookup by nationality and destination would give a clear first answer.
- [Warehouse Dock Appointment Booking API](/apis/warehouse-slot/): I need a carrier to book an arrival slot at a warehouse dock before the truck leaves. Carriers arrive to find docks full, then wait or re-route, and small sites track slots in spreadsheets.
- [Waste Carrier Registration Check API](/apis/waste-carrier-check/): Contractors and platforms must verify a waste carrier is registered before hiring, but the register is only searchable via a web form or bulk zip. The Environment Agency's public registers offer a web search form plus a bulk zip download, with no simple per-business REST lookup.
- [Local Climate Trend API](/apis/weather-climate-trend/): I need a smoothed temperature or rainfall trend for a location over recent years. Planners and farmers want to know whether a location's climate is changing beyond year-to-year noise, but raw station data is noisy and hard to summarise.

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