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API · /kegg-api

KEGG API

healthy 3,135 Subscribers

The KEGG molecular database as an API, powered by the official KEGG REST service. KEGG (the Kyoto Encyclopedia of Genes and Genomes) links genomes, chemistry and disease. Fetch any KEGG entry parsed to JSON — a metabolic compound, KEGG Orthology group (KO), enzyme (EC number), reaction, module, drug, disease, glycan, gene or pathway map; search any KEGG database by name; list a database's entries; cross-link entries between databases (a gene to its pathways, a pathway to its compounds, an enzyme to its reactions); and convert KEGG identifiers to and from outside namespaces (NCBI Gene/Protein, UniProt, ChEBI, PubChem). Ideal for systems-biology and metabolomics pipelines, enzyme and orthology mapping, drug and disease research, gene-to-pathway annotation and bioinformatics id conversion. KEGG ids are letter-prefixed (C compound, K orthology, D drug, H disease, M module, R reaction, G glycan) or organism-coded (hsa human, eco E. coli).

#kegg #molecular-biology #compounds #orthology #enzymes #metabolism #bioinformatics
api.oanor.com/kegg-api
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Machine-readable spec so AI agents can integrate this API.

/api/kegg-api/openapi.json
/api/kegg-api/llms.txt

Discovery: GET /api/index.json lists every API.

KEGG API — live data on the oanor API marketplace

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
988 ms
Server probes · 24h
Subscribers
3,135
active
Total calls
114
last 7 days
status Full status page → · 18 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 500 calls / month
  • 2 requests / second
  • Hard cap (429 above quota, no overage)
  • 500 calls/month
  • 2 req/sec
  • Get, find, link & convert
  • No credit card
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Starter

€7.25 /month

  • 18,800 calls / month
  • 6 requests / second
  • Hard cap (429 above quota, no overage)
  • 18.8k calls/month
  • 6 req/sec
  • Entry lookup & search
  • Email support
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Pro

€21.60 /month

  • 87,500 calls / month
  • 15 requests / second
  • Hard cap (429 above quota, no overage)
  • 87.5k calls/month
  • 15 req/sec
  • Cross-linking & id conversion
  • Priority support
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Mega

€59.20 /month

  • 338,000 calls / month
  • 40 requests / second
  • Hard cap (429 above quota, no overage)
  • 338k calls/month
  • 40 req/sec
  • High-throughput bioinformatics
  • Dedicated SLA
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DNA Melting Temperature API

DNA-oligo and PCR-primer maths as an API, computed locally and deterministically. The tm endpoint computes the melting temperature of a primer sequence three ways: the Wallace rule 2·(A+T) + 4·(G+C) for short oligos up to 13 nt, the Marmur–Wallace GC formula 64.9 + 41·(nGC − 16.4)/N for longer ones, and the salt-adjusted 81.5 + 0.41·%GC − 675/N + 16.6·log10[Na+] for a given sodium concentration, and recommends the right method for the length — an eight-base ATGCATGC melts at 24 °C by Wallace, a 20-base 50 %-GC primer at about 51.8 °C by Marmur. The gc-content endpoint reports the GC and AT percentages, the per-base counts and the single-stranded molecular weight. The reverse-complement endpoint returns the complement, the reverse and the reverse complement of a strand. Sequences use A/C/G/T (case-insensitive, whitespace ignored) and [Na+] is in mol/L. Everything is computed locally and deterministically, so it is instant and private. Ideal for molecular-biology, biotech, PCR, primer-design, bioinformatics and lab-automation app developers, oligo and primer calculators, and LIMS software. Estimation formulas for primer design, not a substitute for nearest-neighbour thermodynamics. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is oligo melting temperature; for population-genetics allele frequencies use a genetics API.

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Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for KEGG API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call KEGG API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for KEGG API?
Free tier allows 1 request per second. Paid plans scale up to 50 requests per second on the Mega tier. Hard limits return HTTP 429 above the quota — no surprise overage charges.
How much does KEGG API cost?
KEGG API has a free tier with 100 calls / month. Paid plans start at €7.25 / month with higher quotas and faster rate limits.
Can I cancel my subscription anytime?
Yes. Plans are billed monthly and you can cancel anytime from your billing dashboard. No long-term contracts and no cancellation fee.
Is KEGG API GDPR-compliant?
All requests to KEGG API go through our EU-based gateway. Your upstream API key never leaves our server and no personal data is shared with the upstream provider beyond the request you send.

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/kegg-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/kegg-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/kegg-api/SOME_PATH");
curl_setopt($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/kegg-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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