API archive entry · source-reported
CycleCalcs
Interpreted astronomy: sun and moon times, moon phases, planets, eclipses, seasons
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.
Molicheck
Anonymous JSON lab/GMP calculators (molarity, dilution, ICH limits); no API key
No auth · HTTPS reported · CORS Yes
Toolalize
Unit and live currency conversion with NIST SI factors, no key needed
No auth · HTTPS reported · CORS Yes
ENA
Nucleotide sequences, genomes and raw reads archive
No auth · HTTPS reported · CORS Yes
Macrostrat
Geologic maps, rock columns and stratigraphy data
No auth · HTTPS reported · CORS Yes
MathJS
Evaluate math expressions via GET or POST as JSON
No auth · HTTPS reported · CORS Yes
NCBI E-utilities
Biomedical literature, sequences and gene databases
No auth · HTTPS reported · CORS Yes
How to compare them
Coverage
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Operating cost
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Integration risk
Test auth, errors, pagination, latency, versioning, and outage behavior.
Data rights
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Source reference
This page separates source-reported facts from questions that need live provider verification.