arcsecond.io
APIComprehensive astronomy data API aggregating multiple celestial sources
arXiv API
APIFree API for accessing curated research papers in physics, math, and related fields
CORE
APIFree API for accessing global Open Access research papers
GBIF
APIFree API for global biodiversity data access
iDigBio
APIFree API for accessing millions of global museum specimen records
inspirehep.net
APIREST API for High Energy Physics Research Data & Metadata
isEven
APIHumor-infused API to check if a number is even
ISRO
APIFree API for ISRO spacecraft and mission information
ITIS
APIAuthoritative taxonomic data API for species classification
Launch Library 2
APIComprehensive API for spaceflight launches and events database
Materials Platform for Data Science
APICurated experimental materials science data API
Minor Planet Center
APIFree API for Minor Planet Center asteroid/comet data via Asterank
NASA API
APIFree access to NASA's space imagery and scientific data
NASA ADS
APIAPI for accessing NASA's Astrophysics Data System literature catalog
Newton
APISymbolic & arithmetic math calculation API
Noctua
APIREST API for accessing NoctuaSky astronomical data features
Numbers
APIFree API for number facts, random numbers, and number of the day
Ocean Facts
APIFree REST API for curated oceanography facts and data
Open Notify
APIFree API for ISS astronaut data and real-time location
Open Science Framework
APIFree API for accessing OSF's research materials, data, and manuscripts
Purple Air
APIReal-time air quality monitoring API with global sensor network data
Remote Calc
APIFree API for decoding base64 math expressions and returning results in JSON
SHARE
APIFree open dataset API for research and scholarly activities
SpaceX API
APIFree REST API for SpaceX company, vehicle, launchpad & launch data
Sunrise and Sunset
APIFree API for sunrise and sunset times by latitude and longitude
Times Adder
APIAPI to sum time values from an array of input strings
TLE
APIFree API for Satellite Two-Line Element (TLE) Data
USGS Earthquake Hazards Program
APIReal-time earthquake data API from the U.S. Geological Survey
USGS Water Services
APIFree API for USGS water quality and level data for rivers & lakes
World Bank
APIFree access to global development data from the World Bank
xMath
APIGenerate random mathematical expressions via API
arXiv API
APIFree API for accessing curated research papers in science & math
isEven (humor)
APIFree humorous API to check if a number is even
NASA
APIFree access to NASA's space imagery and scientific data
SpaceX API
APIFree REST API for SpaceX company, vehicle, launchpad, and launch data
arXiv API
APIFree API for accessing curated research papers in science & math
SpaceX API
APIFree REST API for SpaceX company, vehicle, launchpad & launch data
arXiv
APIFree REST API for accessing arXiv's curated research papers
SpaceX API
APIFree REST API for SpaceX company, vehicle, launchpad, and launch data
SpaceX API
APIFree REST API for SpaceX company, vehicle, launchpad & launch data
SpaceX API
APIFree REST API for SpaceX company, vehicle, launchpad, and launch data
SpaceX
APIFree REST API for SpaceX company, vehicle, launchpad, and launch data