Science & Math – Free-tier APIs
53 Free-tier APIs in the category Science & Math. Free public web APIs that developers and AI agents can call. Entries come from the open public-apis list; each link was checked automatically (HTTP status) on the date shown, which says the site responded, not that the API is good.
arcsecond.io
Multiple astronomy data sources
arXiv
Curated research-sharing platform: physics, mathematics, quantitative finance, and economics
Botlero
Sourced, quoted specs for humanoid robots
Chempirical
Chemical compounds with physical data, reactions and substructure search
CodeCogs
Render LaTeX equations in PNG, GIF, SVG, EMF, PDF, JSON, or download formats with styling options
CORE
Access the world's Open Access research papers
CycleCalcs
Interpreted astronomy: sun and moon times, moon phases, planets, eclipses, seasons
DataCite
Search and retrieve DOI metadata for research datasets and publications
ENA
Nucleotide sequences, genomes and raw reads archive
Europe PMC
Life-science literature search with abstracts, citations and full-text links
GBIF
Global Biodiversity Information Facility
iDigBio
Access millions of museum specimens from organizations around the world
iNaturalist
Citizen-science wildlife observations with species identification and mapping
inspirehep.net
High Energy Physics info. system
isEven (humor)
Check if a number is even
ISRO
ISRO Space Crafts Information
ITIS
Integrated Taxonomic Information System
KEGG
Genes, pathways, compounds and reactions
Launch Library 2
Spaceflight launches and events database
Macrostrat
Geologic maps, rock columns and stratigraphy data
Materials Platform for Data Science
Curated experimental data for materials science
MathJS
Evaluate math expressions via GET or POST as JSON
MyGene.info
Gene annotation queries and ID lookup
NASA
NASA data, including imagery
NASA ADS
NASA Astrophysics Data System
NASA InSight
Mars weather data from InSight lander
NCBI E-utilities
Biomedical literature, sequences and gene databases
Newton
Symbolic and Arithmetic Math Calculator
OBIS
Global marine species occurrence and distribution data
Oliver's mTOR Atlas
Curated mTOR research: studies by evidence type, pathway claims, open questions
Open Ephemeris
Sub-arcsecond planetary positions, natal charts, transits, and Human Design from NASA JPL DE440
Open Science Framework
Repository and archive for study designs, research materials, data, manuscripts, etc
OpenAlex
Open catalog of scholarly works, authors, institutions, sources, and concepts
OrbitalWiki
Catalog of 16,000+ satellites merging CelesTrak, GCAT, Wikidata; free tier included
Purple Air
Real Time Air Quality Monitoring
RCSB PDB
3D structures of proteins and nucleic acids
Remote Calc
Decodes base64 encoding and parses it to return a solution to the calculation in JSON
SatNOGS
Satellite observations from open ground stations
Semantic Scholar
Academic search engine for papers, authors, and citations
SHARE
A free, open, dataset about research and scholarly activities
Solar System OpenData
Data and facts on solar system bodies and planets
SpaceX
Company, vehicle, launchpad and launch data
SpaceX
GraphQL, Company, Ships, launchpad and launch data
Sunrise and Sunset
Sunset and sunrise times for a given latitude and longitude
Tallytopia
Calculators for finance, health, math, space and sports with step-by-step results
Times Adder
With this API you can add each of the times introduced in the array sended
TLE
Satellite information
Unpaywall
Open-access status and legal full-text links for scholarly articles
USGS Earthquake Hazards Program
Earthquakes data real-time
USGS Water Services
Water quality and level info for rivers and lakes
VedIntel™ AstroAPI
Vedic astrology computation — birth charts, dashas, panchang, AI narratives
World Bank
World Data
WoRMS
Marine species taxonomy, synonyms and distributions