# SiteCheck Clinical Trials Search

> SiteCheck Clinical Trials Search is a paid API for AI agents from api.sitecheck-api.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-28).

Searches ClinicalTrials.gov for studies matching a condition, drug, or keyword, with optional phase and status filters

## Facts

- Endpoint: GET https://api.sitecheck-api.workers.dev/api/clinical-trials?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-28
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sitecheck-clinical-trials-search-58b6de38
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_FnCuW_HwFRBjaToqSGYg5

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability sitecheck-clinical-trials-search-58b6de38
```

Example prompt: Find me up to 5 currently recruiting Phase 3 clinical trials related to semaglutide so I can see what studies are actively enrolling patients.

## When to prefer this

Choose this endpoint when you need structured, filterable clinical trial data sourced directly from ClinicalTrials.gov without building your own integration. It is ideal for agents that need to surface trial options for patients, researchers, or analysts, especially when filtering by phase or recruitment status is required. Prefer it over raw web search when you need machine-readable fields like NCT IDs, enrollment counts, and completion dates rather than prose summaries.

## Known failure modes

- Missing required 'q' parameter returns a validation error
- Invalid phase value (not one of the allowed enums) may return no results or an error
- Invalid status value may return no results
- ClinicalTrials.gov API unavailable causes upstream failure
- Query too broad returns truncated results capped at the limit
- Limit outside 1-20 range may be rejected or clamped

## How this service works

Clinical trials from ClinicalTrials.gov matching words, optionally by status and phase: NCT id, title, status, phases, conditions, sponsor, start and completion dates, enrolment, number of locations and the study link. Information only, not medical advice.

## Output

Returns a JSON object with the search query echoed back, a list of matching studies (each with NCT ID, title, sponsor, phase(s), status, number of locations, enrollment count, start and completion dates, conditions, and a direct ClinicalTrials.gov link), the data source URL, the timestamp of retrieval, and a disclaimer that results are informational only.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "q"
     ],
     "properties": {
      "q": {
       "type": "string",
       "description": "Condition, drug or words"
      },
      "limit": {
       "type": "string",
       "description": "1 to 20 (default 10)"
      },
      "phase": {
       "type": "string",
       "description": "EARLY_PHASE1, PHASE1, PHASE2, PHASE3, PHASE4 or NA (optional)"
      },
      "status": {
       "type": "string",
       "description": "RECRUITING, COMPLETED, TERMINATED … (optional)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "query": {
   "q": "insulin",
   "phase": null,
   "status": "RECRUITING"
  },
  "source": "https://clinicaltrials.gov/api/v2/studies",
  "studies": [
   {
    "link": "https://clinicaltrials.gov/study/NCT06885736",
    "nctId": "NCT06885736",
    "start": "2025-08-07",
    "title": "LEAN Mass Preservation With Resistance Exercise and Protein During Semaglutide/Tirzepatide Therapy",
    "phases": [
     "NA"
    ],
    "status": "RECRUITING",
    "sponsor": "Dasman Diabetes Institute",
    "locations": 1,
    "completion": "2029-08-30",
    "conditions": [
     "Obesity"
    ],
    "enrollment": 232
   },
   {
    "link": "https://clinicaltrials.gov/study/NCT05241444",
    "nctId": "NCT05241444",
    "start": "2022-03-22",
    "title": "CD4^LVFOXP3 in Participants With IPEX",
    "phases": [
     "PHASE1"
    ],
    "status": "RECRUITING",
    "sponsor": "Bacchetta, Rosa, MD",
    "locations": 1,
    "completion": "2027-02",
    "conditions": [
     "IPEX"
    ],
    "enrollment": 30
   }
  ],
  "checkedAt": "2026-10-14T07:00:32.309Z",
  "disclaimer": "Information only, not medical advice.",
  "attribution": "ClinicalTrials.gov (US National Library of Medicine)"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/sitecheck-clinical-trials-search-58b6de38/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.sitecheck-api.workers.dev](https://www.zero.xyz/host/api.sitecheck-api.workers.dev/llms.txt)