Explore free Science & Math APIs available for developers. Browse our collection of public APIs in the Science & Math category, each verified and documented for easy integration into your projects.
Last verified: November 12, 2026
| Name | Description | Auth | HTTPS | CORS | Uptime (30 days) |
|---|---|---|---|---|---|
| arcsecond.io | Multiple astronomy data sources | none | Yes | unknown | 100% (5 checks) |
| arXiv | Curated research-sharing platform: physics, mathematics, quantitative finance, and economics | none | Yes | unknown | 20.0% (5 checks) |
| Astroletra | Moon phase and sign, aspects, retrogrades and next lunation by time zone | none | Yes | yes | 100% (1 check) |
| Botlero | Sourced, quoted specs for humanoid robots | none | Yes | yes | 100% (5 checks) |
| Chempirical | Chemical compounds with physical data, reactions and substructure search | none | Yes | yes | 100% (5 checks) |
| CodeCogs | Render LaTeX equations in PNG, GIF, SVG, EMF, PDF, JSON, or download formats with styling options | none | Yes | unknown | 100% (5 checks) |
| CORE | Access the world's Open Access research papers | apikey | Yes | unknown | 100% (5 checks) |
| CycleCalcs | Interpreted astronomy: sun and moon times, moon phases, planets, eclipses, seasons | none | Yes | yes | 100% (5 checks) |
| DataCite | Search and retrieve DOI metadata for research datasets and publications | none | Yes | yes | 100% (5 checks) |
| ENA | Nucleotide sequences, genomes and raw reads archive | none | Yes | yes | 100% (5 checks) |
| Europe PMC | Life-science literature search with abstracts, citations and full-text links | none | Yes | yes | 100% (5 checks) |
| GBIF | Global Biodiversity Information Facility | none | Yes | yes | 100% (5 checks) |
| iDigBio | Access millions of museum specimens from organizations around the world | none | Yes | unknown | 100% (5 checks) |
| iNaturalist | Citizen-science wildlife observations with species identification and mapping | none | Yes | yes | 100% (5 checks) |
| inspirehep.net | High Energy Physics info. system | none | Yes | unknown | 100% (5 checks) |
| isEven (humor) | Check if a number is even | none | Yes | unknown | 100% (5 checks) |
| ITIS | Integrated Taxonomic Information System | none | Yes | unknown | 100% (5 checks) |
| KEGG | Genes, pathways, compounds and reactions | none | Yes | unknown | 100% (5 checks) |
| Launch Library 2 | Spaceflight launches and events database | none | Yes | yes | 100% (5 checks) |
| Macrostrat | Geologic maps, rock columns and stratigraphy data | none | Yes | yes | 100% (5 checks) |
| MathJS | Evaluate math expressions via GET or POST as JSON | none | Yes | yes | 100% (5 checks) |
| Minor Planet Center | Asterank.com Information | none | No | unknown | 100% (5 checks) |
| Molicheck | Anonymous JSON lab/GMP calculators (molarity, dilution, ICH limits); no API key | none | Yes | yes | 100% (5 checks) |
| Moonlora | Moon phases, illumination, moon signs, full/new moon dates (1900–2100), moonrise/moonset by coordinates | none | Yes | yes | 100% (5 checks) |
| MyGene.info | Gene annotation queries and ID lookup | none | Yes | yes | 100% (5 checks) |
| NASA | NASA data, including imagery | none | Yes | no | 100% (5 checks) |
| NASA ADS | NASA Astrophysics Data System | oauth | Yes | yes | 100% (5 checks) |
| NASA Exoplanet Archive | Query every confirmed exoplanet and its measured properties (mass, radius, orbit, host star) with SQL-like ADQL queries, returned as JSON or CSV. | none | Yes | no | 66.7% (3 checks) |
| NASA InSight | Mars weather data from InSight lander | apikey | Yes | yes | 100% (5 checks) |
| NCBI E-utilities | Biomedical literature, sequences and gene databases | none | Yes | yes | 100% (5 checks) |
| NIH RePORTER | Search US National Institutes of Health research grants and the publications they funded, by topic, institution or year. | none | Yes | no | 100% (3 checks) |
| NOAA Space Weather | Solar wind, geomagnetic Kp index, aurora forecasts and solar flare alerts from NOAA's Space Weather Prediction Center, as JSON feeds. | none | Yes | yes | 100% (3 checks) |
| Numbers | Number of the day, random number, number facts and anything else you want to do with numbers | apikey | Yes | no | 100% (5 checks) |
| OBIS | Global marine species occurrence and distribution data | none | Yes | yes | 100% (5 checks) |
| Oliver's mTOR Atlas | Curated mTOR research: studies by evidence type, pathway claims, open questions | none | Yes | yes | 100% (5 checks) |
| Open Ephemeris | Sub-arcsecond planetary positions, natal charts, transits, and Human Design from NASA JPL DE440 | apikey | Yes | no | 100% (5 checks) |
| Open Notify | ISS astronauts, current location, etc | none | No | no | 100% (5 checks) |
| Open Science Framework | Repository and archive for study designs, research materials, data, manuscripts, etc | none | Yes | unknown | 100% (5 checks) |
| OpenAlex | Open catalog of scholarly works, authors, institutions, sources, and concepts | none | Yes | yes | 100% (5 checks) |
| OrbitalWiki | Catalog of 16,000+ satellites merging CelesTrak, GCAT, Wikidata; free tier included | apikey | Yes | yes | 100% (5 checks) |
| Remote Calc | Decodes base64 encoding and parses it to return a solution to the calculation in JSON | none | Yes | yes | 100% (5 checks) |
| SatNOGS | Satellite observations from open ground stations | none | Yes | unknown | 100% (5 checks) |
| Semantic Scholar | Academic search engine for papers, authors, and citations | none | Yes | unknown | 100% (5 checks) |
| SHARE | A free, open, dataset about research and scholarly activities | none | Yes | no | 100% (5 checks) |
| Solar System OpenData | Data and facts on solar system bodies and planets | none | Yes | yes | 100% (5 checks) |
| SpaceX | Company, vehicle, launchpad and launch data | none | Yes | no | 100% (5 checks) |
| Sunrise and Sunset | Sunset and sunrise times for a given latitude and longitude | none | Yes | no | 100% (5 checks) |
| Tallytopia | Calculators for finance, health, math, space and sports with step-by-step results | none | Yes | yes | 100% (5 checks) |
| Times Adder | With this API you can add each of the times introduced in the array sended | none | Yes | no | 100% (5 checks) |
| TLE | Satellite information | none | Yes | no | 100% (5 checks) |
| Toolalize | Unit and live currency conversion with NIST SI factors, no key needed | none | Yes | yes | 100% (4 checks) |
| Unpaywall | Open-access status and legal full-text links for scholarly articles | none | Yes | yes | 100% (5 checks) |
| USGS Earthquake Hazards Program | Earthquakes data real-time | none | Yes | no | 100% (5 checks) |
| VedIntel™ AstroAPI | Vedic astrology computation — birth charts, dashas, panchang, AI narratives | apikey | Yes | yes | 100% (5 checks) |
| World Bank | World Data | none | Yes | no | 100% (5 checks) |
| WoRMS | Marine species taxonomy, synonyms and distributions | none | Yes | no | 80.0% (5 checks) |
49 of these APIs require no authentication — you can start making requests immediately without signing up for an account. Just pick one from the table above, check its documentation, and send your first request.
6 APIs in this category require a free API key. This usually means creating a free account on the provider's website and copying your key from the dashboard. The process typically takes less than a minute.
Not sure where to start? Check the uptime column: it shows how often each API's documentation responded to our daily checks over the last 30 days, and the dot shows whether it responded at the latest check. For browser-based projects, check that the API supports CORS.
Yes, all APIs listed on API Bouncer have a free tier. Some are completely open (no sign-up needed), while others require a free account to get an API key. Free tiers typically have rate limits — check each API's documentation for specifics.
It depends on your needs. Consider: Do you need authentication or prefer no-auth? Does your project need CORS support for browser access? How many requests will you make? Start with a no-auth API to prototype quickly, then switch to a more feature-rich option if needed.
We run periodic health checks on all listed APIs. The "Status" column shows whether each API was responding at our last check. APIs marked as "alive" were recently verified. You can also test any API yourself using curl or our guides on testing APIs.
Most free APIs allow commercial use, but terms vary by provider. Always check the specific API's terms of service. Some APIs have separate free and commercial tiers with different rate limits.
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