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API · /clinicaltrials-api

ClinicalTrials API

healthy 4,781 Subscribers

Search the global clinical-trials registry as an API, powered by the U.S. NIH ClinicalTrials.gov database of 500,000+ studies. Find trials by medical condition, intervention or drug, free-text term, location and recruitment status (recruiting, completed, active, terminated and more), with paging across results, or pull a full study by its NCT id. Each record carries the title, overall status, study type and phases, conditions studied, interventions, lead sponsor, enrollment count, start and completion dates, eligibility criteria (sex, age range, healthy-volunteer policy) and the list of participating sites with city and country. Ideal for patient-matching and recruitment tools, pharma and biotech competitive intelligence, medical research dashboards, health portals and academic analysis.

#clinical-trials #clinicaltrials #medical #health #research #studies
api.oanor.com/clinicaltrials-api
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Machine-readable spec so AI agents can integrate this API.

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

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

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
1022 ms
Server probes · 24h
Subscribers
4,781
active
Total calls
12
last 7 days
status Full status page → · 12 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 3,500 calls / month
  • 2 requests / second
  • Hard cap (429 above quota, no overage)
  • 3,500 calls/month
  • 2 req/sec
  • Search + study lookup
  • No credit card
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Starter

€7.90 /month

  • 55,000 calls / month
  • 8 requests / second
  • Hard cap (429 above quota, no overage)
  • 55k calls/month
  • 8 req/sec
  • Condition & status filters
  • Email support
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Pro

€22.40 /month

  • 280,000 calls / month
  • 20 requests / second
  • Hard cap (429 above quota, no overage)
  • 280k calls/month
  • 20 req/sec
  • Patient-matching & pharma intel
  • Priority support
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Mega

€54.90 /month

  • 1,400,000 calls / month
  • 50 requests / second
  • Hard cap (429 above quota, no overage)
  • 1.4M calls/month
  • 50 req/sec
  • Research & health platforms
  • Dedicated SLA
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Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for ClinicalTrials API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call ClinicalTrials API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for ClinicalTrials 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 ClinicalTrials API cost?
ClinicalTrials API has a free tier with 100 calls / month. Paid plans start at €7.90 / 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 ClinicalTrials API GDPR-compliant?
All requests to ClinicalTrials 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/clinicaltrials-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/clinicaltrials-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/clinicaltrials-api/SOME_PATH");
curl_setopt($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/clinicaltrials-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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