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.
| Name | Description | Auth | HTTPS | CORS | Status |
|---|---|---|---|---|---|
| arcsecond.io | Multiple astronomy data sources | none | Yes | unknown | unknown |
| arXiv | Curated research-sharing platform: physics, mathematics, quantitative finance, and economics | none | Yes | unknown | unknown |
| CORE | Access the world's Open Access research papers | apikey | Yes | unknown | unknown |
| GBIF | Global Biodiversity Information Facility | none | Yes | yes | unknown |
| iDigBio | Access millions of museum specimens from organizations around the world | none | Yes | unknown | unknown |
| inspirehep.net | High Energy Physics info. system | none | Yes | unknown | unknown |
| isEven (humor) | Check if a number is even | none | Yes | unknown | unknown |
| ITIS | Integrated Taxonomic Information System | none | Yes | unknown | unknown |
| Launch Library 2 | Spaceflight launches and events database | none | Yes | yes | unknown |
| Minor Planet Center | Asterank.com Information | none | No | unknown | unknown |
| NASA | NASA data, including imagery | none | Yes | no | unknown |
| NASA ADS | NASA Astrophysics Data System | oauth | Yes | yes | unknown |
| Noctua | REST API used to access NoctuaSky features | none | Yes | unknown | unknown |
| Numbers | Number of the day, random number, number facts and anything else you want to do with numbers | apikey | Yes | no | unknown |
| Open Notify | ISS astronauts, current location, etc | none | No | no | unknown |
| Open Science Framework | Repository and archive for study designs, research materials, data, manuscripts, etc | none | Yes | unknown | unknown |
| Remote Calc | Decodes base64 encoding and parses it to return a solution to the calculation in JSON | none | Yes | yes | unknown |
| SHARE | A free, open, dataset about research and scholarly activities | none | Yes | no | unknown |
| SpaceX | Company, vehicle, launchpad and launch data | none | Yes | no | unknown |
| Sunrise and Sunset | Sunset and sunrise times for a given latitude and longitude | none | Yes | no | unknown |
| Times Adder | With this API you can add each of the times introduced in the array sended | none | Yes | no | unknown |
| TLE | Satellite information | none | Yes | no | unknown |
| USGS Earthquake Hazards Program | Earthquakes data real-time | none | Yes | no | unknown |
| World Bank | World Data | none | Yes | no | unknown |
21 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.
2 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? Look for APIs marked as "alive" in the status column — these were recently verified as working. 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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