# 2s Clinical Trial Study Detail

> 2s Clinical Trial Study Detail is a paid API for AI agents from 2s.io, paid per call via x402, $0.00144/call, status unknown (last checked 2026-09-14).

Retrieves comprehensive details for a specific clinical trial from ClinicalTrials.gov by NCT ID, including design, phases, eligibility, outcomes, and locations.

## Facts

- Endpoint: GET https://2s.io/api/clinical/study-detail
- Price: $0.00144/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/2s-clinical-trial-study-detail-edd1325f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_MhP_RsOTYEGGIKjktzH-X

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 2s-clinical-trial-study-detail-edd1325f
```

Example prompt: Can you pull up the full details for clinical trial NCT04280705 — I want to know the study design, phases, eligibility criteria, locations, and primary outcomes?

## When to prefer this

Use this endpoint when you need comprehensive, structured detail about a single known clinical trial identified by its NCT ID. Prefer this over search endpoints when you already have the NCT ID and need full study metadata including eligibility, design, outcomes, and locations in one call. Ideal for medical research assistants, patient matching, or regulatory due diligence workflows.

## Known failure modes

- Invalid or non-existent NCT ID returns empty items array or error
- NCT ID format incorrect (must start with NCT followed by digits)
- Trial exists but has no detailed data yet returns partial object
- Network timeout if ClinicalTrials.gov upstream is slow
- Payment failure if USDC balance is insufficient

## How this service works

Full ClinicalTrials.gov study record by NCT id — the deep detail beyond clinical.trial-search's summary. Returns the brief + detailed description, status, phases, conditions, study design (allocation, intervention model, primary purpose, masking), enrollment, interventions, primary and secondary outcome measures (with time frames), full eligibility criteria (inclusion/exclusion text, sex, age range, healthy-volunteers, standard age groups), lead sponsor and collaborators, all facility locations (name, city, state, country), whether results are posted, and key dates. Free, public-domain (NIH NLM). Use clinical.trial-search to find an NCT id, then this for the complete protocol.

## Output

Returns a structured object with comprehensive clinical trial data including: NCT ID, brief and official titles, study status, phases, study type, design details (masking, allocation, intervention model, primary purpose), start and completion dates, enrollment count, lead sponsor, collaborators, list of interventions, conditions studied, eligibility criteria (sex, age ranges, inclusion/exclusion text, healthy volunteers), trial locations (facility, city, state, country), primary and secondary outcomes with timeframes, whether results are available, and last update date. Also includes source metadata referencing 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",
    "queryParams"
   ],
   "properties": {
    "type": {
     "const": "http"
    },
    "method": {
     "const": "GET"
    },
    "queryParams": {
     "required": [
      "nctId"
     ],
     "properties": {
      "nctId": {
       "type": "string",
       "description": "ClinicalTrials.gov NCT id, e.g. NCT04280705."
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/2s-clinical-trial-study-detail-edd1325f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from 2s.io](https://www.zero.xyz/host/2s.io/llms.txt)