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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.

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
875 ms
Server probes · 24h
Subscribers
3,135
active
Total calls
18
last 7 days
status Full status page → · 36 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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Chemical compound data as an API, powered by NIH PubChem (>100 million compounds). Look up any compound by common name, PubChem CID or SMILES and get its molecular formula, molecular and exact mass, IUPAC name, canonical SMILES, InChI and InChIKey, plus physicochemical properties (XLogP, TPSA, formal charge, hydrogen-bond donor/acceptor counts, rotatable bonds, heavy-atom count). List a compound's synonyms and trade/registry names, or resolve a name to PubChem CIDs. Ideal for cheminformatics, lab software, education, drug-discovery tooling and scientific data pipelines.

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Reactome API

The Reactome pathway knowledgebase as an API — the open, peer-reviewed database of biological pathways and reactions, powered by the official Reactome ContentService. Search the curated archive of pathways, reactions and molecules; read any entity by its Reactome stable id (a pathway, reaction, complex or protein: name, type, species, compartments, summary and disease flag); list the events (sub-pathways and reactions) contained in a pathway; list the molecules participating in a pathway or reaction with their reference identifiers; get the top-level pathways for any model organism; map a UniProt protein to the pathways it takes part in; and list the supported species. Covers human and 15+ model organisms across metabolism, signal transduction, cell cycle, immune system, disease and more. Ideal for systems-biology and bioinformatics pipelines, pathway-enrichment and drug-target tools, biomedical research apps, teaching resources and life-science chatbots.

api.oanor.com/reactome-api

Genome Assemblies API

Reference genome assemblies as an API — powered by NCBI Assembly, the registry of genome builds for organisms across the tree of life. Search assemblies by organism (or free text) and look up any assembly's metadata: its accession (GCF_… RefSeq or GCA_… GenBank), name (e.g. GRCh38.p14), organism and taxon id, assembly level (complete genome, chromosome, scaffold or contig), contiguity statistics (contig and scaffold N50), sequencing coverage, RefSeq category, UCSC and Ensembl names, the submitting organization, release date and FTP download paths. From the human reference genome to any sequenced microbe, plant or animal, it turns the genome-assembly registry into a clean search-and-fetch API. A genome-assembly registry — distinct from sequence (ENA), genome annotation (Ensembl), variant (ClinVar, dbVar) and gene-expression (GEO) databases. Open data from NCBI Assembly (public domain).

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Gene Expression API

Functional-genomics experiments as an API — powered by NCBI GEO (Gene Expression Omnibus), the largest public repository of gene-expression data. GEO archives expression series and curated datasets from microarray and high-throughput-sequencing experiments across every organism. Search experiments by keyword and optionally by organism, and look up any series or dataset to get its metadata: title, summary, assay type (expression profiling by array or by sequencing), organism, number of samples, platform and the publication behind it. From β-cell stress studies to cancer transcriptomics across human and mouse, it turns the GEO archive into a simple search-and-fetch API for transcriptomics, bioinformatics and research-data discovery. A gene-expression / functional-genomics dataset repository — distinct from sequence (ENA), variant (ClinVar, dbVar), structure (PDB) and ontology databases. Open data from NCBI GEO (public domain).

api.oanor.com/geodatasets-api

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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