API archive entry · source-reported
Toolalize
Unit and live currency conversion with NIST SI factors, no key needed
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
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
OBIS
Global marine species occurrence and distribution data
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.