API marketplace

Maven Central — the package repository at the heart of the Java and JVM ecosystem (Java, Kotlin, Scala, Groovy, Android) — as an API. Search the repository for artifacts by keyword and get each artifact's groupId:artifactId, latest version, total number of versions, packaging type and last-updated date; look up a single artifact by its group and artifact coordinates; and list its full version history (newest first) with release dates and published file types. Live from the official Maven Central search service. Ideal for dependency dashboards, build tooling, supply-chain and security analysis, developer portals and JVM ecosystem analytics. Open data from Maven Central.

Uptime

41.7%

Latency

7714ms

Subs

4,500

Check any website's SSL/TLS certificate as an API. Pass a domain and the service performs a live TLS handshake and returns the certificate's subject and issuer, the validity window, the exact number of days until it expires, whether it is currently valid and trusted by a standard CA chain, the negotiated TLS protocol, serial number, SHA-256 fingerprint, key size and the full list of Subject Alternative Names (SANs). A lean expiry endpoint returns a simple ok / expiring_soon / expired status, perfect for uptime and certificate-expiry monitoring, dashboards, CI checks and security tooling. Self-contained — no third-party service. IP addresses and internal hosts are not supported.

Uptime

100.0%

Latency

110ms

Subs

3,172

Search millions of freely-licensed images and media as an API, from Wikimedia Commons. Pass a search term and get matching photos and illustrations with their direct full-resolution image URL, a ready-to-use thumbnail, dimensions, file size, MIME type, and crucially the licence (Creative Commons or public domain), licence URL and author/credit — everything you need to find and correctly attribute reusable media. Or look up a single file by name for its full details. Ideal for blogs, content and marketing tools, presentations, education and apps that need free, attributable imagery. Open data from Wikimedia Commons (always check each file's licence before reuse).

Uptime

100.0%

Latency

385ms

Subs

4,545

The Packagist.org registry — the package ecosystem of PHP and Composer — as an API. Look up any package (vendor/package, e.g. monolog/monolog, laravel/framework, symfony/console) for its description, type, total/monthly/daily download counts, GitHub stars, forks and open issues, number of dependents, latest stable version and its PHP requirement; search the registry by keyword and tag; and list a package's full version history (newest stable first). Live from the official Packagist API. Ideal for package dashboards, dependency and supply-chain tooling, developer portals and PHP ecosystem analytics. Open data from Packagist.org.

Uptime

100.0%

Latency

147ms

Subs

4,057

The NuGet.org registry — the package ecosystem of .NET — as an API. Look up any NuGet package for its description, latest version, total download count, authors, tags, project, license and icon URLs; search the registry by keyword across millions of packages; and list a package's full version history (newest first). Live from the official NuGet APIs. Ideal for package dashboards, dependency and supply-chain tooling, developer portals and .NET ecosystem analytics. Open data from NuGet.org.

Uptime

100.0%

Latency

330ms

Subs

4,484

The UK Parliament as an API — Members of the House of Commons (MPs) and the House of Lords, and the bills passing through Parliament, live from the official UK Parliament data services. Search members by name and house and get their party, constituency or peerage, gender, portrait and membership dates; look up any member by id; and search the bills currently before (or recently passed) Parliament with their long and short titles, originating and current house, and current stage (e.g. Report stage, Royal Assent). Ideal for civic-tech, news, political-research, transparency and government-monitoring apps. Open data from the UK Parliament.

Uptime

100.0%

Latency

1260ms

Subs

3,578

The RubyGems.org registry — home of the Ruby ecosystem — as an API. Look up any gem for its description, current version, total and per-version download counts, authors, license, homepage, source and documentation links, and its runtime and development dependencies; search the registry by keyword; and browse a gem's full version history with per-version download numbers. Live from the official RubyGems.org API. Ideal for package dashboards, dependency and supply-chain tooling, developer portals and Ruby ecosystem analytics. Open data from RubyGems.org.

Uptime

100.0%

Latency

242ms

Subs

4,850

The crates.io registry — home of the Rust ecosystem — as an API. Look up any Rust crate for its description, latest and recent versions, total and recent download counts, license, repository, documentation and homepage links, keywords and categories; search and rank the whole registry by relevance, downloads, recent downloads, recent updates or newest; and inspect the dependency tree of a crate's newest (or any) version. Live from the official crates.io API. Ideal for package dashboards, dependency tooling, security/supply-chain analysis, developer portals and Rust ecosystem analytics. Open data from crates.io.

Uptime

100.0%

Latency

482ms

Subs

4,084

Wikipedia, located — find the Wikipedia articles near any coordinate ("Wikipedia near me") as an API, live from the official MediaWiki API. Pass a latitude and longitude and get the nearby places, landmarks and points of interest with their distance in metres, a two-sentence summary, a thumbnail image and a link — perfect for travel guides, maps, augmented-reality and location-aware apps. Or look up a single article to get its coordinates, description, summary and image. Works for every language edition (en.wikipedia, de.wikipedia, fr.wikipedia and 300+ more). Open data from Wikipedia.

Uptime

100.0%

Latency

317ms

Subs

4,227

Generate .gitignore files as an API — 309 ready-to-use .gitignore templates for languages, frameworks, tools and editors, straight from GitHub's official github/gitignore collection. Fetch the .gitignore for any single technology (Node, Python, Java, Rust, Unity, …), search and list all available templates by name or category (languages, editors/OS globals, community stacks), or — the headline feature — combine several templates into one ready-to-commit .gitignore in a single call (e.g. names=Node,Python,macOS). Ideal for scaffolding tools, project generators, IDEs, CLIs and developer dashboards. Open data from github/gitignore (CC0).

Uptime

100.0%

Latency

76ms

Subs

3,136

Simplified, example-driven help for the command line as an API — the community tldr-pages project, 7,045 command-line tools across Linux, macOS, Windows and more. Instead of dense man pages, every command (tar, git, ffmpeg, curl, docker, ssh, awk, …) comes back as a short description plus a handful of practical, copy-paste example commands with placeholders. Look up a command, search commands by name or description, filter by platform, or fetch a random command. Ideal for terminals, IDEs, chatbots, developer tools, onboarding and learning. Open data from tldr-pages (CC-BY).

Uptime

100.0%

Latency

75ms

Subs

4,183

Wikipedia pageview statistics as an API, live from the official Wikimedia REST API. See the most-viewed Wikipedia articles for any day — a real-time pulse of what the world is reading and searching for — with junk namespaces filtered out by default, and get the daily (or monthly) view counts and totals for any individual article over any date range. Works for any language edition (en.wikipedia, de.wikipedia, fr.wikipedia and 300+ projects) and any access method (desktop, mobile-web, mobile-app). Ideal for trend analysis, news, research, dashboards, SEO and content strategy. Public Wikimedia data.

Uptime

100.0%

Latency

148ms

Subs

4,439

The Encyclopaedia of Chess Openings (ECO) as an API — 3,161 named chess openings and variations with their ECO code (A00–E99), full name, family/variation and the exact move sequence (PGN and a clean move list). Search openings by name, ECO code or ECO volume; list every opening under a code (e.g. B20 → 27 Sicilian lines); pick a random opening; and — the killer feature — identify which opening a game is in from a sequence of moves (e.g. "1. e4 c5 2. Nf3" → Sicilian Defense). Ideal for chess apps, game analysis, training tools, bots and trivia. Open data from the lichess-org/chess-openings project.

Uptime

100.0%

Latency

76ms

Subs

4,815

Castles around the world as an API — 17,000+ castles from Wikidata with their country, geographic coordinates and the year they were built. Search and filter castles by name, country and build-year range, or find every castle near any coordinate by great-circle distance (perfect for "castles near me" features). Spanning Germany, Italy, France, Spain, the UK and 100+ countries, it is ideal for travel, tourism, maps, history, education and trivia apps. Open data from Wikidata.

Uptime

100.0%

Latency

79ms

Subs

3,109

Stadiums and sports venues around the world as an API — 7,000+ stadiums from Wikidata with their seating capacity, country and city, geographic coordinates and year opened. Search and filter by name, country, minimum capacity and opening year (the results come back largest-first, so it doubles as a "biggest stadiums in the world" ranking), or find every stadium near any coordinate by great-circle distance. Ideal for sports, travel, ticketing, maps, trivia and matchday apps. Open data from Wikidata.

Uptime

100.0%

Latency

82ms

Subs

3,298

US Treasury fiscal data as an API, live from the official api.fiscaldata.treasury.gov. Track the US national debt to the penny (total public debt outstanding, debt held by the public and intragovernmental holdings) for the latest day or any date range; get the average interest rates the US government pays on its securities (Treasury Bills, Notes, Bonds, TIPS and more); and look up the official US Treasury reporting exchange rates for ~170 world currencies, used to convert foreign currency to USD for government reporting. Ideal for debt clocks, macro-economic dashboards, fintech, research and data journalism. Public-domain US Treasury data.

Uptime

100.0%

Latency

403ms

Subs

4,151

Every public bike-share and e-scooter system in the world as an API — 1,500+ systems across 48 countries from the MobilityData GBFS catalog, plus LIVE station availability. Browse and search the systems catalog by country or name (Citi Bike, Vélib', Divvy, Blue Bikes, Capital Bikeshare, …), look up a system with its GBFS feed URLs, and fetch real-time station data — each station's name, location, capacity and how many bikes and docks are free right now — or find the nearest stations to any coordinate by great-circle distance. Ideal for trip-planning, mobility, maps and smart-city apps. Catalog data from MobilityData; live availability from each operator's official GBFS feed.

Uptime

100.0%

Latency

77ms

Subs

3,539

US federal government spending as an API, live from the official USAspending.gov (US Treasury). Search federal awards — contracts, grants, loans and direct payments — by keyword, recipient, award type and fiscal year, ranked by amount, with the recipient name, dollar amount, awarding agency, description and award dates. Rank the top recipients of federal money for any search, and list and inspect the 100+ top-tier federal agencies with their budgetary resources. Ideal for government-transparency, investigative journalism, contractor intelligence, grants research, GovCon and policy-analysis applications. Public-domain US Treasury data.

Uptime

100.0%

Latency

1306ms

Subs

3,437

The US Federal Register as an API — the official daily journal of the United States government, live from federalregister.gov. Search the full record of federal rules, proposed rules, public notices and presidential documents (including executive orders) by keyword, document type, issuing agency and publication-date range; fetch any document by its number with title, abstract, agencies, publication and signing dates, executive-order number and links to the official HTML and PDF; and list the 470+ federal agencies. Ideal for legal-tech, compliance, regulatory-monitoring, government-transparency, policy-research and news applications. Public-domain US government data.

Uptime

100.0%

Latency

251ms

Subs

4,452

Every member of the United States Congress as an API — all 12,766 legislators, current and historical, from 1789 to today. Look up any member by Bioguide or GovTrack id, or search and filter the full roster by name, US state, party and chamber (Senate / House), and list the current members of Congress. Each record carries the member's name, gender, birthday, party, state and district, chamber, the number of terms served and the complete term-by-term history with start and end dates, plus cross-reference ids (GovTrack, OpenSecrets, FEC, Wikipedia, Wikidata). Ideal for civic-tech, news, government-transparency, lobbying and political-research apps. Data from the public-domain @unitedstates project.

Uptime

100.0%

Latency

85ms

Subs

3,388

Chemical compound data as an API, powered by NIH PubChem (>100 million compounds). Look up any compound by common name, PubChem CID or SMILES and get its molecular formula, molecular and exact mass, IUPAC name, canonical SMILES, InChI and InChIKey, plus physicochemical properties (XLogP, TPSA, formal charge, hydrogen-bond donor/acceptor counts, rotatable bonds, heavy-atom count). List a compound's synonyms and trade/registry names, or resolve a name to PubChem CIDs. Ideal for cheminformatics, lab software, education, drug-discovery tooling and scientific data pipelines.

Uptime

100.0%

Latency

493ms

Subs

4,829

Every UNESCO World Heritage Site as an API — all 1,236 inscribed sites worldwide (cultural, natural and mixed) from the official UNESCO World Heritage List. Look up any site by its WHC id (e.g. Galápagos Islands, Machu Picchu, Historic Centre of Rome) with its country, exact coordinates, the year it was inscribed and the UNESCO selection criteria. Search and filter by name, country, category (cultural / natural / mixed) and inscription year, or find every World Heritage Site near any coordinate by great-circle distance. Ideal for travel, tourism, maps, education and cultural-discovery apps.

Uptime

100.0%

Latency

82ms

Subs

4,534

The full SPDX License List as an API — all 729 software licenses with metadata and the complete license text for each. Look up any license by its SPDX id (e.g. MIT, Apache-2.0, GPL-3.0-only, MPL-2.0) and get the exact, canonical license text plus its name, reference URL, see-also links and standard header. Search or list licenses by name/id and filter by OSI-approved (Open Source Initiative), FSF-libre (Free Software Foundation) or deprecated status. Ideal for SBOM / license-compliance tooling, package managers, repository scanners, legal review, and open-source governance dashboards.

Uptime

100.0%

Latency

81ms

Subs

3,122

Live natural events happening around the world as an API, from NASA EONET (Earth Observatory Natural Event Tracker). List currently active (or past) events — wildfires, severe storms and tropical cyclones, volcanoes, floods, landslides, droughts, sea/lake ice and more — each with its title, category, current location and date, the full track of geometry points over time, and source links; or find the events nearest any coordinate (great-circle distance). Filter by category or time window. Ideal for natural-hazard dashboards, situational awareness, travel-safety, insurance and environmental monitoring.

Uptime

100.0%

Latency

598ms

Subs

4,503