Free Science & Space APIs
Space, physics and research data from agencies and observatories. 37 of 49 on our probe schedule.
49In catalog49Probed by us36Healthy now1Degraded / dying539msMedian P50100.0%Median uptime · 30d
Unusual Units ConverterScience & SpaceUnusual Units Converter — Unit converter for standard and uncommon unitsHEALTHYauth noneScience & SpaceHEALTHY100%103 msnone1h agoBootprintScience & SpaceBootprint — keyless JSON APIHEALTHYauth noneScience & SpaceHEALTHY100%67 msnone10h agoElevenLabs API DocumentationScience & SpaceElevenLabs API Documentation — free tier with API keyHEALTHYauth apiKeyScience & SpaceHEALTHY100%216 msapiKey24 min agoAgent Hustle APIScience & SpaceAgent Hustle API — free tier with API keyHEALTHYauth apiKeyScience & SpaceHEALTHY100%210 msapiKey12h agoNot Human SearchScience & SpaceA search engine that ranks sites by how agent-ready they areHEALTHYauth noneScience & SpaceHEALTHY100%239 msnone6h agoTensorFeedScience & SpaceJSON feeds of AI news, model prices, and agent activityHEALTHYauth noneScience & SpaceHEALTHY100%306 msnone6h agoMinor Planet CenterScience & SpaceQuery asteroids by orbit, size and value via AsterankHEALTHYauth noneScience & SpaceHEALTHY99.02%217 msnone2h agoPhone Number ValidatorScience & SpacePhone Number Validator — This API validates phone numbers, providing details sHEALTHYauth noneScience & SpaceHEALTHY100%342 msnone2h agoSHAREScience & SpaceAn open dataset of scholarly research activityHEALTHYauth noneScience & SpaceHEALTHY100%353 msnone5h agoISROScience & SpaceIndia's spacecraft roster as clean JSONHEALTHYauth noneScience & SpaceHEALTHY100%369 msnone5h agoinspirehep.netScience & SpaceSearch the high-energy-physics literature by APIHEALTHYauth noneScience & SpaceHEALTHY100%514 msnone5h agoNewtonScience & SpaceSymbolic and arithmetic math over HTTPHEALTHYauth noneScience & SpaceHEALTHY100%323 msnone5h agoWorld BankScience & SpaceDevelopment indicators for every country on EarthHEALTHYauth noneScience & SpaceHEALTHY96.1%216 msnone5h agoPhonepe APIScience & SpacePhonepe API — free tier with API keyHEALTHYauth apiKeyScience & SpaceHEALTHY100%487 msapiKey10h agoAlan Perlis QuotesScience & SpaceAlan Perlis Quotes — This API provides random epigrams by Alan Perlis, a not…HEALTHYauth noneScience & SpaceHEALTHY100%380 msnone1h agoJina AIScience & SpaceJina AI — free-tier JSON endpointHEALTHYauth apiKeyScience & SpaceHEALTHY100%255 msapiKey10h agoarcsecond.ioScience & SpaceAstronomical object data from a single endpointHEALTHYauth noneScience & SpaceHEALTHY100%587 msnone5h agoStock Sentiment APIScience & SpaceStock Sentiment API — free-tier JSON endpointHEALTHYauth apiKeyScience & SpaceHEALTHY100%531 msapiKey10h agoNoctuaScience & SpaceResolve star and sky-object names to catalog dataHEALTHYauth noneScience & SpaceHEALTHY100%742 msnone5h agoUSGS Earthquake Hazards ProgramScience & SpaceReal-time global earthquake feeds as GeoJSONHEALTHYauth noneScience & SpaceHEALTHY99.02%549 msnone5h agoGBIFScience & SpaceGlobal biodiversity — species and occurrencesHEALTHYauth noneScience & SpaceHEALTHY100%737 msnone3h agoKeen IOScience & SpaceKeen IO — free tier with API keyHEALTHYauth apiKeyScience & SpaceHEALTHY100%667 msapiKey54 min agoisEven (humor)Science & SpaceThe API that reveals whether a number is evenHEALTHYauth noneScience & SpaceHEALTHY98.0%573 msnone5h agoJPL Close ApproachScience & SpaceNear-Earth object close-approach dataHEALTHYauth noneScience & SpaceHEALTHY98.0%676 msnone1h agoDeepAIScience & SpaceDeepAI — free tier with API keyHEALTHYauth apiKeyScience & SpaceHEALTHY99.02%810 msapiKey1h agoMediaCraft AIScience & SpaceMediaCraft AI — free tier with API keyHEALTHYauth apiKeyScience & SpaceHEALTHY79.4%231 msapiKey1h agoSatellite PassesScience & SpaceSatellite Passes — keyless JSON APIHEALTHYauth noneScience & SpaceHEALTHY99.02%976 msnone10h agoGoldBeanScience & SpaceGoldBean — free tier with API keyHEALTHYauth apiKeyScience & SpaceHEALTHY100%875 msapiKey54 min agoUSGS Water ServicesScience & SpaceLive streamflow and gauge readings for US watersHEALTHYauth noneScience & SpaceHEALTHY87.3%828 msnone5h agoUSPTOScience & SpaceUSPTO — keyless JSON APIHEALTHYauth noneScience & SpaceHEALTHY100%1141 msnone6h agoDiffbot APIScience & SpaceDiffbot API — free-tier JSON endpointHEALTHYauth apiKeyScience & SpaceHEALTHY100%1144 msapiKey10h agoTLEScience & SpaceTwo-line element sets for orbiting satellitesHEALTHYauth noneScience & SpaceHEALTHY88.2%1090 msnone10h agoITISScience & SpaceFederal taxonomy: names, authors, and TSNsHEALTHYauth noneScience & SpaceHEALTHY97.1%1767 msnone5h agoiDigBioScience & SpaceSearch millions of digitized biological specimensHEALTHYauth noneScience & SpaceHEALTHY92.2%1700 msnone5h agoOpen NotifyScience & SpaceWhere is the ISS right now? A beloved API in decline.HEALTHYauth noneScience & SpaceHEALTHY71.6%241 msnone7h agoOpen Science FrameworkScience & SpaceProgrammatic access to the Open Science FrameworkHEALTHYauth noneScience & SpaceHEALTHY97.1%952 msnone5h agoLaunch Library 2Science & SpaceDatabase of rocket launches, agencies, and space eventsauth noneScience & Space3.9%546 msnone13h agoNASA APODScience & SpaceAstronomy Picture of the Day, straight from NASA.DEADauth apiKeyScience & SpaceDEAD0.0%—apiKey7h agoOpenAlexScience & SpaceOpen index of 300M+ scholarly works, authors, and venuesDEADauth noneScience & SpaceDEAD1.0%3167 msnone14h agoStrictly Better APIScience & SpaceStrictly Better API — This API allows users to retrieve and search for obsole…DEADauth noneScience & SpaceDEAD0.0%—none12h agoRoboflow UniverseScience & SpaceRoboflow Universe — free tier with API keyDEADauth apiKeyScience & SpaceDEAD0.0%—apiKey12h agoGroqScience & SpaceGroq — free tier with API keyDEADauth apiKeyScience & SpaceDEAD0.0%—apiKey11h agoSkyBiometryScience & SpaceSkyBiometry — free tier with API keyDEADauth apiKeyScience & SpaceDEAD0.0%—apiKey10h agoOpenAI APIScience & SpaceOpenAI API — free tier with API keyDEADauth apiKeyScience & SpaceDEAD0.0%—apiKey10h agoPerplexity AI APIScience & SpacePerplexity AI API — free tier with API keyDEADauth apiKeyScience & SpaceDEAD0.0%—apiKey10h agoMotaWord APIScience & SpaceMotaWord API — free tier with API keyDEADauth apiKeyScience & SpaceDEAD0.0%—apiKey10h agoLemonfox.ai APIScience & SpaceLemonfox.ai API — free tier with API keyDEADauth apiKeyScience & SpaceDEAD0.0%—apiKey10h agoSpeechText.AI API APIScience & SpaceSpeechText.AI API API — free tier with API keyDEADauth apiKeyScience & SpaceDEAD0.0%—apiKey10h agoReplicateScience & SpaceReplicate — free tier with API keyDEADauth apiKeyScience & SpaceDEAD0.0%—apiKey10h ago
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Free Science & Space APIs — FAQ
Are there free Science & Space APIs with no API key?
Yes — 29 of the 49 free science & space APIs we list need no API key or signup (Unusual Units Converter is a good starting point). Use the "No key" filter above to see them; they're the fastest to prototype with.
Which free Science & Space API is the most reliable?
Of the 49 science & space APIs on our probe schedule, Unusual Units Converter leads on measured uptime (100% over 90 days). Reliability here is verified from our own scheduled checks, not the provider's claims — sort by "Reliable" to rank the rest.
Can I call these Science & Space APIs from the browser?
35 of these science & space APIs send CORS headers over HTTPS, so you can fetch them straight from front-end code — no backend proxy. Filter by "Browser OK" to see them; the rest need a server-side call.
Are these free Science & Space APIs OK for commercial use?
5 of the 49 science & space APIs allow commercial use on the free tier; the rest are unclear or personal-only. We record service terms and the data license as separate fields on every listing — check both before you ship.
How often are these Science & Space APIs checked?
37 of the 49 science & space APIs are on our probe schedule and re-tested every sweep. We log uptime, latency and response-shape changes on each, and move any that stay down to the graveyard so you can see what died and when.