A single element by symbol, number or name
API · /elements-api
Chemical Elements API
The complete periodic table as an API — all 119 chemical elements with their atomic and physical properties: atomic number and mass, category, phase, melting and boiling point, density, electron configuration, electronegativity, ionization energies and a short summary. Look up an element by symbol, atomic number or name, search and filter by category/phase/block, or fetch the whole table. Ideal for chemistry tools, education apps and science projects.
API health
healthy- Uptime
- 100.00%
- Server probes · 24h
- Avg latency
- 84 ms
- Server probes · 24h
- Subscribers
- 4,505
- active
- Total calls
- 380
- last 7 days
Pricing
Pick a tier — billed monthly, cancel anytime.
Free
Free
- 1,500 calls / month
- 3 requests / second
- Hard cap (429 above quota, no overage)
- 1,500 calls/month
- 3 req/sec
- Lookup + search + full table
- No credit card
Starter
€4.00 /month
- 30,000 calls / month
- 8 requests / second
- Hard cap (429 above quota, no overage)
- 30k calls/month
- 8 req/sec
- All filters
- Email support
Pro
€13.00 /month
- 200,000 calls / month
- 20 requests / second
- Hard cap (429 above quota, no overage)
- 200k calls/month
- 20 req/sec
- Education / app integration
- Priority support
Mega
€37.00 /month
- 1,200,000 calls / month
- 40 requests / second
- Hard cap (429 above quota, no overage)
- 1.2M calls/month
- 40 req/sec
- Embed in product
- Dedicated SLA
Built by
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Polygenic (risk) scores as an API — powered by the NHGRI-EBI PGS Catalog, the open database of published polygenic scores: weighted combinations of genetic variants used to estimate a person's genetic predisposition to a trait or disease. Search traits by name to find their ontology ids, list every polygenic score developed for a trait, and read a score's full metadata — the reported and mapped (EFO/MONDO) traits, the number of variants in the score, the development method, genome build, the ancestry distribution of the samples it was built and evaluated on, the publication behind it (title, journal, date, PubMed id), the release date, license and a direct link to the scoring file. From breast cancer and coronary artery disease to type 2 diabetes and BMI, it is ideal for statistical genetics, genomics, risk-prediction research and bioinformatics tools. A polygenic-score / genetic-risk-prediction resource — distinct from single-variant association studies (GWAS Catalog), population allele frequencies (gnomAD) and clinical variant interpretation (ClinVar). Open data from the NHGRI-EBI PGS Catalog (CC BY 4.0).
api.oanor.com/pgs-api
Frequently asked questions
Quick answers about pricing, quotas, and integration.
How do I get an API key for Chemical Elements API?
What's the rate limit for Chemical Elements API?
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Pick an endpoint from the list on the left to see its details and try it.
Code snippets
Sign up to get an API key, then call any path under your slug.
curl https://api.oanor.com/elements-api/SOME_PATH \
-H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/elements-api/SOME_PATH", {
headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/elements-api/SOME_PATH");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
$response = curl_exec($ch);
import requests
r = requests.get(
"https://api.oanor.com/elements-api/SOME_PATH",
headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())
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