← Clinical Trials (ClinicalTrials.gov)
health by fourzerotwo
Search clinical trials
Find studies by condition, intervention (drug/device), location, sponsor or free text, optionally filtered by status and phase.
Search clinical trials Free
Find studies by condition, intervention (drug/device), location, sponsor or free text, optionally filtered by status and phase.
- cost
- Free then $0.003 / call
- MCP tool
- clinical-trials__search
- method
- GET
Free up to 100 calls a day over MCP (500 with a free key), then $0.003 per call by card credit or USDC. Free key · Pay by card
GET https://fourzerotwo.si/v1/clinical-trials/search
| Param | Type | Description |
|---|---|---|
| condition? | string | Condition or disease, e.g. "type 2 diabetes" |
| intervention? | string | Drug, device or procedure |
| location? | string | City, region or country |
| sponsor? | string | Sponsor or collaborator |
| q? | string | Free-text search across the record |
| status? | string | Comma-separated: RECRUITING, NOT_YET_RECRUITING, ACTIVE_NOT_RECRUITING, COMPLETED, TERMINATED… |
| phase? | string | 1, 2, 3, 4, EARLY_PHASE1 or NA |
| limit? | integer | Results per page, 1-50 (default 20) |
| page_token? | string | next_page_token from a previous response |
# free: send a free key from https://fourzerotwo.si/free curl -H "X-API-Key: fzt_…" "https://fourzerotwo.si/v1/clinical-trials/search" # no key: returns 402 with the price, for x402 agents curl -i "https://fourzerotwo.si/v1/clinical-trials/search"
by fourzerotwo
Report this endpoint
Use it from an AI agent (MCP)
Add the server once, then ask for this data in plain English. The agent finds the endpoint with search_apis and runs it with call_api.
{
"mcpServers": {
"fourzerotwo": { "type": "http", "url": "https://fourzerotwo.si/mcp" }
}
}
# the call the agent makes
call_api {"tool": "clinical-trials__search", "arguments": {"condition":"asthma","status":"RECRUITING","limit":10}}
More from Clinical Trials (ClinicalTrials.gov)
- Study by NCT number — One study: title, status, phase, conditions, interventions, sponsor, enrolment, dates, eligibility basics, pri...
- Recruiting trials near a place — Studies recruiting (or about to) for a condition in a city, region or country, with the matching trial sites.
- Trial counts by status — How many registered studies for a condition are recruiting, active, completed, terminated or withdrawn.
Source: ClinicalTrials.gov, U.S. National Library of Medicine (US Government, free of charge). Reformatted by fourzerotwo; no endorsement implied.