Free Science & Space APIs
Space, physics and research data from agencies and observatories. 49 of 49 on our probe schedule · 7 probed.
49In catalog7Probed by us1Healthy now1Degraded / dying—Median P50NaN%Median uptime · 30d
NASA APODScience & SpaceAstronomy Picture of the Day, straight from NASA.HEALTHYauth apiKeyScience & SpaceHEALTHY—%—apiKey2h agoOpen NotifyScience & SpaceWhere is the ISS right now? A beloved API in decline.auth noneScience & Space—%—none2h agoNot Human SearchScience & SpaceA search engine that ranks sites by how agent-ready they areUNMONITOREDauth noneScience & SpaceUNMONITORED—%—none1h agoTensorFeedScience & SpaceJSON feeds of AI news, model prices, and agent activityUNMONITOREDauth noneScience & SpaceUNMONITORED—%—none1h agoLaunch Library 2Science & SpaceDatabase of rocket launches, agencies, and space eventsUNMONITOREDauth noneScience & SpaceUNMONITORED—%—none1h agoOpenAlexScience & SpaceOpen index of 300M+ scholarly works, authors, and venuesUNMONITOREDauth noneScience & SpaceUNMONITORED—%—none1h agoUSPTOScience & SpaceUSPTO — keyless JSON APIUNMONITOREDauth noneScience & SpaceUNMONITORED—%—none58 min agoisEven (humor)Science & SpaceThe API that reveals whether a number is evenUNMONITOREDauth noneScience & SpaceUNMONITORED—%—nonejust nowISROScience & SpaceIndia's spacecraft roster as clean JSONUNMONITOREDauth noneScience & SpaceUNMONITORED—%—nonejust nowTLEScience & SpaceTwo-line element sets for orbiting satellitesUNMONITOREDauth noneScience & SpaceUNMONITORED—%—nonejust nowinspirehep.netScience & SpaceSearch the high-energy-physics literature by APIUNMONITOREDauth noneScience & SpaceUNMONITORED—%—nonejust nowiDigBioScience & SpaceSearch millions of digitized biological specimensUNMONITOREDauth noneScience & SpaceUNMONITORED—%—nonejust nowarcsecond.ioScience & SpaceAstronomical object data from a single endpointUNMONITOREDauth noneScience & SpaceUNMONITORED—%—nonejust nowITISScience & SpaceFederal taxonomy: names, authors, and TSNsUNMONITOREDauth noneScience & SpaceUNMONITORED—%—nonejust nowNewtonScience & SpaceSymbolic and arithmetic math over HTTPUNMONITOREDauth noneScience & SpaceUNMONITORED—%—nonejust nowNoctuaScience & SpaceResolve star and sky-object names to catalog dataUNMONITOREDauth noneScience & SpaceUNMONITORED—%—nonejust nowOpen Science FrameworkScience & SpaceProgrammatic access to the Open Science FrameworkUNMONITOREDauth noneScience & SpaceUNMONITORED—%—nonejust nowSHAREScience & SpaceAn open dataset of scholarly research activityUNMONITOREDauth noneScience & SpaceUNMONITORED—%—nonejust nowUSGS Earthquake Hazards ProgramScience & SpaceReal-time global earthquake feeds as GeoJSONUNMONITOREDauth noneScience & SpaceUNMONITORED—%—nonejust nowUSGS Water ServicesScience & SpaceLive streamflow and gauge readings for US watersUNMONITOREDauth noneScience & SpaceUNMONITORED—%—nonejust nowWorld BankScience & SpaceDevelopment indicators for every country on EarthUNMONITOREDauth noneScience & SpaceUNMONITORED—%—nonejust nowGBIFScience & SpaceGlobal biodiversity — species and occurrencesUNMONITOREDauth noneScience & SpaceUNMONITORED—%—nonejust nowMinor Planet CenterScience & SpaceQuery asteroids by orbit, size and value via AsterankUNMONITOREDauth noneScience & SpaceUNMONITORED—%—nonejust nowPhone Number ValidatorScience & SpacePhone Number Validator — This API validates phone numbers, providing details sUNMONITOREDauth noneScience & SpaceUNMONITORED—%—nonejust nowAlan Perlis QuotesScience & SpaceAlan Perlis Quotes — This API provides random epigrams by Alan Perlis, a not…UNMONITOREDauth noneScience & SpaceUNMONITORED—%—nonejust nowJPL Close ApproachScience & SpaceNear-Earth object close-approach dataUNMONITOREDauth noneScience & SpaceUNMONITORED—%—nonejust nowUnusual Units ConverterScience & SpaceUnusual Units Converter — Unit converter for standard and uncommon unitsUNMONITOREDauth noneScience & SpaceUNMONITORED—%—nonejust nowDeepAIScience & SpaceDeepAI — free tier with API keyUNMONITOREDauth apiKeyScience & SpaceUNMONITORED—%—apiKeyjust nowMediaCraft AIScience & SpaceMediaCraft AI — free tier with API keyUNMONITOREDauth apiKeyScience & SpaceUNMONITORED—%—apiKeyjust nowGoldBeanScience & SpaceGoldBean — free tier with API keyUNMONITOREDauth apiKeyScience & SpaceUNMONITORED—%—apiKeyjust nowKeen IOScience & SpaceKeen IO — free tier with API keyUNMONITOREDauth apiKeyScience & SpaceUNMONITORED—%—apiKeyjust nowElevenLabs API DocumentationScience & SpaceElevenLabs API Documentation — free tier with API keyUNMONITOREDauth apiKeyScience & SpaceUNMONITORED—%—apiKeyjust nowStrictly Better APIScience & SpaceStrictly Better API — This API allows users to retrieve and search for obsole…UNMONITOREDauth noneScience & SpaceUNMONITORED—%—nonejust nowRoboflow UniverseScience & SpaceRoboflow Universe — free tier with API keyUNMONITOREDauth apiKeyScience & SpaceUNMONITORED—%—apiKeyjust nowAgent Hustle APIScience & SpaceAgent Hustle API — free tier with API keyUNMONITOREDauth apiKeyScience & SpaceUNMONITORED—%—apiKeyjust nowGroqScience & SpaceGroq — free tier with API keyUNMONITOREDauth apiKeyScience & SpaceUNMONITORED—%—apiKeyjust nowSkyBiometryScience & SpaceSkyBiometry — free tier with API keyON SCHEDULEauth apiKeyScience & SpaceON SCHEDULE—%—apiKeyjust nowOpenAI APIScience & SpaceOpenAI API — free tier with API keyUNMONITOREDauth apiKeyScience & SpaceUNMONITORED—%—apiKeyjust nowPerplexity AI APIScience & SpacePerplexity AI API — free tier with API keyUNMONITOREDauth apiKeyScience & SpaceUNMONITORED—%—apiKeyjust nowMotaWord APIScience & SpaceMotaWord API — free tier with API keyUNMONITOREDauth apiKeyScience & SpaceUNMONITORED—%—apiKeyjust nowLemonfox.ai APIScience & SpaceLemonfox.ai API — free tier with API keyUNMONITOREDauth apiKeyScience & SpaceUNMONITORED—%—apiKeyjust nowSpeechText.AI API APIScience & SpaceSpeechText.AI API API — free tier with API keyON SCHEDULEauth apiKeyScience & SpaceON SCHEDULE—%—apiKeyjust nowPhonepe APIScience & SpacePhonepe API — free tier with API keyUNMONITOREDauth apiKeyScience & SpaceUNMONITORED—%—apiKeyjust nowReplicateScience & SpaceReplicate — free tier with API keyUNMONITOREDauth apiKeyScience & SpaceUNMONITORED—%—apiKeyjust nowSatellite PassesScience & SpaceSatellite Passes — keyless JSON APIUNMONITOREDauth noneScience & SpaceUNMONITORED—%—nonejust nowBootprintScience & SpaceBootprint — keyless JSON APIUNMONITOREDauth noneScience & SpaceUNMONITORED—%—nonejust nowDiffbot APIScience & SpaceDiffbot API — free-tier JSON endpointUNMONITOREDauth apiKeyScience & SpaceUNMONITORED—%—apiKeyjust nowStock Sentiment APIScience & SpaceStock Sentiment API — free-tier JSON endpointUNMONITOREDauth apiKeyScience & SpaceUNMONITORED—%—apiKeyjust nowJina AIScience & SpaceJina AI — free-tier JSON endpointUNMONITOREDauth apiKeyScience & SpaceUNMONITORED—%—apiKeyjust now
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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 (Open Notify 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 7 science & space APIs on our probe schedule, NASA APOD leads on measured uptime (—% 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?
34 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?
49 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.