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API · /atc-api

ATC Drug Classification API

healthy 4,153 Subscribers

The WHO ATC (Anatomical Therapeutic Chemical) drug classification as an API — 6,400+ codes organising every medicine into a 5-level hierarchy: anatomical main group → therapeutic subgroup → pharmacological subgroup → chemical subgroup → chemical substance. Look up any ATC code (e.g. A10BA02 → metformin, N02BE01 → paracetamol, J01CA04 → amoxicillin) with its full ancestor chain, direct children and WHO Defined Daily Doses (DDD); search drugs by name; or navigate the tree from the 14 anatomical main groups. Ideal for e-prescribing, pharmacy, clinical decision support, drug databases and health analytics.

#atc #drugs #medical-codes #pharmacy #who #classification
api.oanor.com/atc-api
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Machine-readable spec so AI agents can integrate this API.

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

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

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
74 ms
Server probes · 24h
Subscribers
4,153
active
Total calls
252
last 7 days
status Full status page → · 252 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 4,000 calls / month
  • 2 requests / second
  • Hard cap (429 above quota, no overage)
  • 4,000 calls/month
  • 2 req/sec
  • Lookup + search + tree
  • No credit card
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Starter

€4.50 /month

  • 55,000 calls / month
  • 8 requests / second
  • Hard cap (429 above quota, no overage)
  • 55k calls/month
  • 8 req/sec
  • Hierarchy + DDDs
  • Email support
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Pro

€14.00 /month

  • 280,000 calls / month
  • 20 requests / second
  • Hard cap (429 above quota, no overage)
  • 280k calls/month
  • 20 req/sec
  • e-Rx / clinical tools
  • Priority support
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Mega

€36.00 /month

  • 1,400,000 calls / month
  • 50 requests / second
  • Hard cap (429 above quota, no overage)
  • 1.4M calls/month
  • 50 req/sec
  • Health-data platform
  • Dedicated SLA
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Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for ATC Drug Classification API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call ATC Drug Classification API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for ATC Drug Classification 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 ATC Drug Classification API cost?
ATC Drug Classification API has a free tier with 100 calls / month. Paid plans start at €4.50 / 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 ATC Drug Classification API GDPR-compliant?
All requests to ATC Drug Classification 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/atc-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/atc-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/atc-api/SOME_PATH");
curl_setopt($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/atc-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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