# ClinicalTrials.gov Trial Results Summarizer

> ClinicalTrials.gov Trial Results Summarizer is a paid API for AI agents from payai.agentstools.dev, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-15).

Fetches and summarizes posted results for a clinical trial from ClinicalTrials.gov by NCT ID, including participant flow, primary outcome metadata, and serious adverse event counts.

## Facts

- Endpoint: GET https://payai.agentstools.dev/trials/results
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/clinicaltrials-gov-trial-results-summarizer-ca509809
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_FCgT1hWUE9zLQGpbUOZd6

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 clinicaltrials-gov-trial-results-summarizer-ca509809
```

Example prompt: Can you pull up the results summary for clinical trial NCT03228186 — I want to know if results have been posted, the participant flow, the primary outcome measures, and how many serious adverse events were reported?

## When to prefer this

Use this endpoint when you need a concise, structured summary of a clinical trial's posted results — including safety signals, participant flow, and primary outcomes — without parsing raw ClinicalTrials.gov data yourself. Prefer this over scraping ClinicalTrials.gov directly or using full clinical trial registries when you only need aggregate result-level data for a known NCT ID.

## Known failure modes

- No results posted: returns has_results=false with no outcome or adverse event data
- Invalid or malformed NCT ID: likely returns an error or empty response
- Trial does not exist on ClinicalTrials.gov: returns not-found or empty result
- Network or upstream ClinicalTrials.gov API unavailability: may return a timeout or 5xx error

## How this service works

Summarize the posted results of a clinical trial by NCT id: results-posted date, aggregate participant flow, primary outcome measure metadata and aggregate serious adverse-event counts from ClinicalTrials.gov. Reports has_results false when no results have been posted.

## Output

Returns a structured summary including: whether results have been posted (has_results boolean), the results-posted date, aggregate participant flow data, primary outcome measure metadata, and aggregate counts of serious adverse events — all sourced from ClinicalTrials.gov.

## 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": {
      "id": {
       "type": "string",
       "description": "Alias for nct"
      },
      "nct": {
       "type": "string",
       "description": "A ClinicalTrials.gov NCT id such as NCT03228186"
      }
     }
    }
   },
   "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/clinicaltrials-gov-trial-results-summarizer-ca509809/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from payai.agentstools.dev](https://www.zero.xyz/host/payai.agentstools.dev/llms.txt)