# Clinical Trials Search

> Clinical Trials Search is a paid API for AI agents from bess-x402.onrender.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-30).

Search ClinicalTrials.gov by condition, drug/device, or sponsor to retrieve trial status, phase, enrollment, dates, interventions, and countries.

## Facts

- Endpoint: GET https://bess-x402.onrender.com/v1/health/clinical-trials?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-30
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/clinical-trials-search-4936d5e3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_4ItR3zbEx--VdaqJNRoLt

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 clinical-trials-search-4936d5e3
```

Example prompt: Find me up to 20 recruiting phase 3 clinical trials for obesity on ClinicalTrials.gov, sponsored by Eli Lilly, involving tirzepatide.

## When to prefer this

Use this endpoint when you need structured, filterable clinical trial data from ClinicalTrials.gov without building your own integration. It is ideal for pharma/biotech competitive intelligence, patient advocacy research, drug pipeline analysis, and academic research requiring trial metadata by condition, intervention, sponsor, phase, or status. Prefer this over direct ClinicalTrials.gov scraping for agent workflows needing clean, structured JSON output.

## Known failure modes

- No trials found matching the given condition/sponsor/intervention combination — returns empty results
- Invalid phase value (not one of: 1, 2, 3, 4, early1) — may return error or empty results
- Invalid status value (not one of: recruiting, active, completed, not_yet_recruiting, terminated, withdrawn) — may return error
- Limit out of range (must be 1-50) — may return validation error
- ClinicalTrials.gov upstream API unavailable — service returns error
- Overly broad query returning too many results — use limit parameter to cap output

## How this service works

Search ClinicalTrials.gov by condition, drug/device or sponsor: status, phase, enrollment, start and completion dates, sponsor, interventions and countries. Use for pharma, biotech and patient research.

## Output

Returns a list of matching clinical trials from ClinicalTrials.gov, each including trial status, phase, enrollment count, start and completion dates, sponsor name, interventions (drugs/devices), and countries where the trial is conducted.

## 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",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [],
     "properties": {
      "limit": {
       "type": "integer",
       "description": "Maximum number of results (1-50)"
      },
      "phase": {
       "type": "string",
       "description": "1, 2, 3, 4 or early1"
      },
      "status": {
       "type": "string",
       "description": "recruiting, active, completed, not_yet_recruiting, terminated or withdrawn"
      },
      "sponsor": {
       "type": "string",
       "description": "Sponsor, e.g. Pfizer"
      },
      "condition": {
       "type": "string",
       "description": "Condition, e.g. obesity"
      },
      "intervention": {
       "type": "string",
       "description": "Drug or device, e.g. tirzepatide"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/clinical-trials-search-4936d5e3/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from bess-x402.onrender.com](https://www.zero.xyz/host/bess-x402.onrender.com/llms.txt)