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API · /chembl-api

ChEMBL API

healthy 4,558 Subscribers

The ChEMBL database of bioactive molecules as an API — the EBI's manually curated knowledgebase of drug-like compounds and their biological activity, powered by the official ChEMBL data API. Look up a compound by its ChEMBL id for its development phase, chemical structure (SMILES, InChIKey), molecular formula and weight, calculated properties (ALogP, polar surface area, hydrogen-bond donors/acceptors, Rule-of-Five violations, QED drug-likeness) and synonyms; search compounds by name; read a biological target with its organism and UniProt protein components; list a drug's mechanisms of action; list its approved and investigational indications (MeSH and EFO terms with development phase); and pull its measured bioactivities (IC50, Ki, EC50, potency…) with values, units, pChEMBL scores, assays and targets. Ideal for drug-discovery and cheminformatics pipelines, medicinal-chemistry and pharmacology tools, target-identification and SAR research, and life-science apps.

#chembl #drug-discovery #cheminformatics #molecules #bioactivity #pharmacology #life-sciences
api.oanor.com/chembl-api
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Machine-readable spec so AI agents can integrate this API.

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

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

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
1661 ms
Server probes · 24h
Subscribers
4,558
active
Total calls
21
last 7 days
status Full status page → · 42 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 540 calls / month
  • 2 requests / second
  • Hard cap (429 above quota, no overage)
  • 540 calls/month
  • 2 req/sec
  • Compounds, targets & activities
  • No credit card
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Starter

€7.30 /month

  • 18,500 calls / month
  • 6 requests / second
  • Hard cap (429 above quota, no overage)
  • 18.5k calls/month
  • 6 req/sec
  • Compound & target lookup
  • Email support
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Pro

€22.00 /month

  • 87,000 calls / month
  • 15 requests / second
  • Hard cap (429 above quota, no overage)
  • 87k calls/month
  • 15 req/sec
  • Mechanisms & bioactivities
  • Priority support
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Mega

€60.50 /month

  • 335,000 calls / month
  • 40 requests / second
  • Hard cap (429 above quota, no overage)
  • 335k calls/month
  • 40 req/sec
  • High-throughput drug discovery
  • Dedicated SLA
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Open Targets API

Drug target–disease associations as an API, powered by the Open Targets Platform. Open Targets integrates human genetics, genomics, transcriptomics, known drugs, animal models and the scientific literature to systematically score how strongly a target (gene/protein) is associated with a disease — the evidence that underpins modern drug discovery. Search across targets, diseases and drugs; read a target for its approved symbol, biotype, function, genomic location and UniProt ids together with the diseases it is most strongly associated with and their overall association scores; read a disease for its description, therapeutic areas and its top associated targets with scores; and read a drug for its modality, maximum clinical stage, trade names, synonyms and mechanisms of action. Ideal for drug-discovery and target-identification pipelines, therapeutic-area research, biomedical data science and pharma intelligence tools. Target ids are Ensembl gene ids, disease ids are EFO/MONDO/Orphanet ids, drug ids are ChEMBL ids. Data is open (CC0).

api.oanor.com/opentargets-api

Chemistry API

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.

api.oanor.com/chemistry-api

BioSamples API

BioSamples as an API, powered by EMBL-EBI — the database that stores and links the metadata of biological samples, the physical specimens behind biological experiments. A sample in BioSamples carries a stable accession (such as SAMEA3231268) and a rich set of characteristics — organism, tissue or organism part, cell type, sex, disease, developmental stage, strain and any submitter-provided attributes — and is referenced by other EBI archives including the European Nucleotide Archive (ENA), ArrayExpress and PRIDE. /v1/search?q=liver searches samples by free text and returns each match's accession, name, organism and release date. /v1/sample?id=SAMEA3231268 returns a sample's metadata — its accession, name, NCBI taxon id, organism, release and update dates, the number of relationships to other samples, and its characteristics flattened to a clean key→value map. Accessions look like SAMEA…, SAMN… or SAMD…; get one from the search endpoint. Ideal for life-science data integration, sample tracking, metadata harmonisation and linking sequencing or expression data back to its source specimen. Data from EMBL-EBI BioSamples (public). This is a biological-sample metadata registry — distinct from study (BioStudies), sequence (ENA), variant (ClinVar) and structure databases.

api.oanor.com/biosamples-api

BioStudies API

BioStudies as an API, powered by EMBL-EBI — the database that holds the descriptions of biological studies and links their data together across EBI resources, including imaging (BioImage Archive), functional genomics (ArrayExpress), proteomics, and the literature (Europe PMC). Each study has an accession, a title and abstract, the collection it belongs to and links to its underlying data and publications. /v1/search?query=covid searches the studies and returns each match's accession (e.g. S-EPMC8017430), title, author, study type, release date and link/file counts. /v1/study?id=S-EPMC8017430 returns a study's metadata — its accession, the collection it belongs to (such as EuropePMC, ArrayExpress or BioImages), title, abstract, release date, authors and the number of linked resources. Accessions look like S-EPMC8017430 or S-BSST123; get one from the search endpoint. Ideal for research-data discovery, linking literature to its underlying datasets, systematic reviews and reproducibility tooling. Data from EMBL-EBI BioStudies (public). This is a studies and datasets metadata index — distinct from the sequence (UniProt, ENA), structure (PDB, EMDB), variant (ClinVar) and ontology databases.

api.oanor.com/biostudies-api

Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for ChEMBL API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call ChEMBL API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for ChEMBL 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 ChEMBL API cost?
ChEMBL API has a free tier with 100 calls / month. Paid plans start at €7.30 / 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 ChEMBL API GDPR-compliant?
All requests to ChEMBL 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/chembl-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/chembl-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/chembl-api/SOME_PATH");
curl_setopt($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/chembl-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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