API Bouncer

Buy me a coffee

Chempirical

Chemical compounds with physical data, reactions and substructure search

Science & MathAuth: NoneHTTPS: YesCORS: yesStatus: alive

Last verified: November 12, 2026

Reliability

100% uptime: the documentation responded in 5 of 5 checks over the last 30 days. Median response time: 451 ms.

How we check, and the most reliable APIs →

Visit API →

At a glance

// Fetch the docs page with cURL curl https://chempirical.com/api/

History

  • November 12, 2026: last health check, responding

See every change to the directory →

More Science & Math APIs

Looking for other Science & Math APIs? Here are more free options in the same category:

  • Astroletra — Moon phase and sign, aspects, retrogrades and next lunation by time zone
  • Botlero — Sourced, quoted specs for humanoid robots
  • CORE — Access the world's Open Access research papers
  • CodeCogs — Render LaTeX equations in PNG, GIF, SVG, EMF, PDF, JSON, or download formats with styling options
  • 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
  • ITIS — Integrated Taxonomic Information System

View all Science & Math APIs →