Free APIScienceNo keyOfficial
ClinicalTrials.gov API v2
Query 450k+ registered clinical studies worldwide, keyless JSON
The U.S. NIH ClinicalTrials.gov v2 REST API provides programmatic search and retrieval of registered clinical studies: conditions, interventions, phases, status, sponsors, locations and outcomes. Rebuilt in 2024, it returns clean JSON with token-based pagination and a structured query syntax. No key required.
Free tier
Free, no keyRate limits
Not publishedAuth
No keyBase URL
https://clinicaltrials.gov/api/v2What you'd build with it
- Find recruiting trials for a condition in a patient-facing skill
- Track competitor pharma trial pipelines for an automation
- Enrich a drug with its registered trial phases and status
Key endpoints
- GET
/studiesSearch studies by term, condition, status, phase, location - GET
/studies/{nctId}Fetch a single study by NCT ID - GET
/stats/sizeDataset statistics (counts and sizes)
Members
Members get the runnable recipe
Sign in free to copy the example request, see a sample response, and read the gotchas.
Tags
healthclinical-trialsresearchnih