# x402stock Clinical Trials Data

> x402stock Clinical Trials Data is a paid API for AI agents from agents.x402stock.xyz, paid per call via x402 or MPP, $0.02/call, status unknown (last checked 2026-10-12).

Fetches clinical trials data via the x402stock pay-per-request API, accessible without API keys using USDC micropayments

## Facts

- Endpoint: GET https://agents.x402stock.xyz/api/v1/clinical-trials?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402, MPP
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402stock-clinical-trials-data-04cf1671
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_kwf2PBZ5CAIIxuyipjane

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 x402stock-clinical-trials-data-04cf1671
```

Example prompt: Can you pull clinical trial data for me — I need information on trials related to Alzheimer's disease treatments, and I'm happy to pay the $0.02 per-call fee via USDC.

## When to prefer this

Choose this endpoint when you need clinical trial data without setting up API keys or accounts, and can pay per-request in USDC via x402. Particularly useful for AI agents operating autonomously that need frictionless access to healthcare and biotech research data. However, note that this endpoint's path (/clinical-trials) is anomalous given that the broader x402stock service is described as a financial and market data platform — verify the endpoint is returning expected clinical trial data before relying on it in production.

## Known failure modes

- Insufficient USDC balance causing payment failure and 402 response
- Invalid or malformed properties parameter returning 400 error
- Endpoint returning empty results if no trials match the query
- Upstream data provider downtime causing 503 or timeout
- Rate limiting if too many requests are sent in rapid succession

## How this service works

Clinical trials run by a company, from ClinicalTrials.gov, newest first. Pass `?sponsor=Vertex Pharmaceuticals` (required) plus `?limit=` (max 100). Each trial carries NCT id, title, status, phase(s), study type, conditions, enrollment, lead sponsor, and start/completion/update dates with a link. A primary biotech catalyst. From x402stock, a market & economic data API (x402, USDC).

## Output

Returns clinical trial records and metadata matching the query properties, including study details, status, phases, conditions, interventions, and sponsor information sourced through the x402stock proxy.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "properties": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "source",
  "as_of",
  "sponsor",
  "total_matched",
  "count",
  "trials",
  "attribution"
 ],
 "properties": {
  "as_of": {
   "type": "string"
  },
  "count": {
   "type": "number"
  },
  "source": {
   "type": "string",
   "const": "clinicaltrials_gov"
  },
  "trials": {
   "type": "array",
   "items": {
    "type": "object",
    "required": [
     "nct_id",
     "title",
     "status",
     "phases",
     "study_type",
     "conditions",
     "enrollment",
     "lead_sponsor",
     "sponsor_class",
     "start_date",
     "primary_completion_date",
     "completion_date",
     "last_update",
     "url"
    ],
    "properties": {
     "url": {
      "anyOf": [
       {
        "type": "string"
       },
       {
        "type": "null"
       }
      ]
     },
     "title": {
      "anyOf": [
       {
        "type": "string"
       },
       {
        "type": "null"
       }
      ]
     },
     "nct_id": {
      "anyOf": [
       {
        "type": "string"
       },
       {
        "type": "null"
       }
      ]
     },
     "phases": {
      "type": "array",
      "items": {
       "type": "string"
      }
     },
     "status": {
      "anyOf": [
       {
        "type": "string"
       },
       {
        "type": "null"
       }
      ]
     },
     "conditions": {
      "type": "array",
      "items": {
       "type": "string"
      }
     },
     "enrollment": {
      "anyOf": [
       {
        "type": "number"
       },
       {
        "type": "null"
       }
      ]
     },
     "start_date": {
      "anyOf": [
       {
        "type": "string"
       },
       {
        "type": "null"
       }
      ]
     },
     "study_type": {
      "anyOf": [
       {
        "type": "string"
       },
       {
        "type": "null"
       }
      ]
     },
     "last_update": {
      "anyOf": [
       {
        "type": "string"
       },
       {
        "type": "null"
       }
      ]
     },
     "lead_sponsor": {
      "anyOf": [
       {
        "type": "string"
       },
       {
        "type": "null"
       }
      ]
     },
     "sponsor_class": {
      "anyOf": [
       {
        "type": "string"
       },
       {
        "type": "null"
       }
      ]
     },
     "completion_date": {
      "anyOf": [
       {
        "type": "string"
       },
       {
        "type": "null"
       }
      ]
     },
     "primary_completion_date": {
      "anyOf": [
       {
        "type": "string"
       },
       
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402stock-clinical-trials-data-04cf1671/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agents.x402stock.xyz](https://www.zero.xyz/host/agents.x402stock.xyz/llms.txt)