# Rotary Agency Clinical Trials API

> Rotary Agency Clinical Trials API is a paid API for AI agents from rotaryagency.uk, paid per call via x402, $0.002/call, status down (last checked 2026-10-25).

Retrieves structured clinical trials data from free public sources via a pay-per-call proxy endpoint

## Facts

- Endpoint: GET https://rotaryagency.uk/api/free/clinicaltrials?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: down
- Last checked: 2026-10-25
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/rotary-agency-clinical-trials-api-50472d6c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_mIaOVChvH_CmUCgkHgDXn

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 rotary-agency-clinical-trials-api-50472d6c
```

Example prompt: Can you search clinical trials for stage 3 non-small cell lung cancer and show me any actively recruiting studies, especially ones testing immunotherapy interventions?

## When to prefer this

Choose this endpoint when you need quick, low-cost programmatic access to clinical trials data without setting up a direct integration with ClinicalTrials.gov or similar registries. At $0.002/call it is cost-effective for agents making occasional lookups. Prefer alternatives if you need bulk downloads, advanced filtering, or guaranteed SLA.

## Known failure modes

- No trials found matching the query — returns empty results array
- Invalid or malformed query parameters — returns 400-level error
- Upstream clinical trials registry unavailable — returns 502 or timeout
- Payment not processed — returns 402 Payment Required
- Rate limiting if too many calls in short succession

## How this service works

Free-source data APIs (100% margin, no proxy, $0.002/call): ...

## Output

Returns structured JSON containing clinical trial records matching the query, likely including fields such as trial ID (NCT number), title, status (recruiting/completed/etc.), phase, conditions studied, interventions, eligibility criteria, sponsor, and study dates.

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "varies": "endpoint-specific structured JSON"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/rotary-agency-clinical-trials-api-50472d6c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from rotaryagency.uk](https://www.zero.xyz/host/rotaryagency.uk/llms.txt)