API archive entry · source-reported
OrbitalWiki
Catalog of 16,000+ satellites merging CelesTrak, GCAT, Wikidata; free tier included
Other Science & Math APIs
These records share a directory category and are ordered by similarity of reported access facts. They are a shortlist, not proof of drop-in compatibility.
NASA InSight
Mars weather data from InSight lander
API key · HTTPS reported · CORS Yes
VedIntel™ AstroAPI
Vedic astrology computation — birth charts, dashas, panchang, AI narratives
API key · HTTPS reported · CORS Yes
CORE
Access the world's Open Access research papers
API key · HTTPS reported · CORS Unknown
Materials Platform for Data Science
Curated experimental data for materials science
API key · HTTPS reported · CORS No
Numbers
Number of the day, random number, number facts and anything else you want to do with numbers
API key · HTTPS reported · CORS No
CycleCalcs
Interpreted astronomy: sun and moon times, moon phases, planets, eclipses, seasons
No auth · HTTPS reported · CORS Yes
How to compare them
Coverage
Compare exact endpoints, fields, geography, history, and update frequency.
Operating cost
Model request volume, caching, overages, support, and migration cost.
Integration risk
Test auth, errors, pagination, latency, versioning, and outage behavior.
Data rights
Review attribution, redistribution, retention, privacy, and commercial-use terms.
Source reference
This page separates source-reported facts from questions that need live provider verification.