Name: ClinicalTrials.gov Search API | Trials, Sponsors & Sites
Brand: cblu
SKU: api-cblu-clinical-trials
Availability: InStock
Author: API Market

# ClinicalTrials.gov Search API

## Overview

Search the official ClinicalTrials.gov registry (US NIH/NLM) and get clean, flat JSON study records: NCT number, title, recruitment status, phase, study type, enrollment, conditions, interventions, lead sponsor and sponsor class, central contacts, overall officials, and every study site with its named principal investigators, plus eligibility criteria.

Every call queries the official ClinicalTrials.gov API v2 live, no login, no API key on your end, no scraping.

## Features

- **Live queries** against the official ClinicalTrials.gov v2 API, not a stale internal copy
- **Named investigators and contacts**, not just sponsor names, central contacts and per-site principal investigators where the registry publishes them
- **Rich filtering** by condition, intervention, sponsor, sponsor class, phase, status, location, and free text
- **Eligibility data** included on every record: sex, age range, healthy volunteers

## Use Cases

- **Pharma and biotech competitive intelligence**, tracking a competitor's pipeline by sponsor and phase
- **CRO site selection and business development**, finding sites and named investigators running trials in a condition and geography
- **Patient recruitment**, surfacing actively recruiting trials by condition, location, and eligibility
- **KOL and investigator mapping**, principal investigators by therapeutic area, with site facilities

## Pricing

Access is billed through API.market according to the plan you choose. Because each call runs a live query against the ClinicalTrials.gov API, response time is typically 5 to 30 seconds.

## API Documentation

### Base URL

```text
https://prod.api.market/api/v1/cblu/clinical-trials
```

### Authentication

Every request must include your API.market key in the `x-api-market-key` header.

```text
x-api-market-key: YOUR_API_MARKET_KEY
```

### Endpoints

#### `POST /acts/UopWqNE2gfHNHZkYZ/run-sync-get-dataset-items`

Searches ClinicalTrials.gov and returns matching study records.

**Request body**

| Field | Type | Description |
| :---- | :--- | :---------- |
| `condition` | `string` | Condition or disease, e.g. "diabetes", "breast cancer". |
| `intervention` | `string` | Intervention, drug, or device, e.g. "semaglutide". |
| `sponsor` | `string` | Lead sponsor or collaborator, e.g. "Pfizer". |
| `locationTerm` | `string` | Free-text location (city, facility, region), e.g. "Boston". |
| `searchTerm` | `string` | General free-text search across the whole study record. |
| `statuses` | `array` | Recruitment status filter: `RECRUITING`, `NOT_YET_RECRUITING`, `ACTIVE_NOT_RECRUITING`, `COMPLETED`, `ENROLLING_BY_INVITATION`, `SUSPENDED`, `TERMINATED`, `WITHDRAWN`, `UNKNOWN`. |
| `phases` | `array` | Trial phase filter: `EARLY_PHASE1`, `PHASE1`, `PHASE2`, `PHASE3`, `PHASE4`, `NA`. |
| `sponsorClasses` | `array` | Lead-sponsor class filter: `NIH`, `FED`, `OTHER_GOV`, `INDIV`, `INDUSTRY`, `NETWORK`, `AMBIG`, `OTHER`, `UNKNOWN`. |
| `studyType` | `string` | `INTERVENTIONAL`, `OBSERVATIONAL`, or `EXPANDED_ACCESS`. |
| `state` | `string` | Full US state name of a study site, e.g. "Texas". |
| `country` | `string` | Country of a study site, e.g. "United States". |
| `maxResults` | `integer` | Maximum study records to return in this call, up to 100. |

At least one narrowing criterion is required: `condition`, `intervention`, `sponsor`, `locationTerm`, or `searchTerm`.

**Example request**

```bash
curl -X POST "https://prod.api.market/api/v1/cblu/clinical-trials/acts/UopWqNE2gfHNHZkYZ/run-sync-get-dataset-items" \
     -H "x-api-market-key: YOUR_API_MARKET_KEY" \
     -H "Content-Type: application/json" \
     -d '{"condition":"cancer","state":"Texas","statuses":["RECRUITING"],"sponsorClasses":["INDUSTRY"],"maxResults":50}'
```

**Example response**

```json
[
  {
    "nctId": "NCT07222137",
    "title": "A Study of Baricitinib in At-Risk Individuals for Type 1 Diabetes",
    "overallStatus": "RECRUITING",
    "phase": "PHASE3",
    "studyType": "INTERVENTIONAL",
    "enrollment": 300,
    "conditions": [
      "Type 1 Diabetes"
    ],
    "interventions": [
      {
        "type": "DRUG",
        "name": "Baricitinib"
      }
    ],
    "leadSponsor": {
      "name": "Example Pharma Inc.",
      "class": "INDUSTRY"
    },
    "centralContacts": [
      {
        "name": "Study Team",
        "phone": "+1 555 010 1234",
        "email": "trials@example.com"
      }
    ],
    "sites": [
      {
        "facility": "University Medical Center",
        "city": "Houston",
        "state": "Texas",
        "country": "United States",
        "principalInvestigators": [
          "Jane Smith, MD"
        ]
      }
    ],
    "eligibility": {
      "sex": "ALL",
      "minimumAge": "1 Year",
      "maximumAge": "35 Years",
      "healthyVolunteers": false
    },
    "studyUrl": "https://clinicaltrials.gov/study/NCT07222137"
  }
]
```

Investigator emails are published only where the sponsor lists them. Central contacts usually carry phone and email; site principal investigators are often name-only, this mirrors what the official registry publishes.

## Status Codes

| Code | Meaning |
| :--- | :------ |
| `200` / `201` | Request succeeded, the body is an array of matching study records. |
| `400` | Invalid input, or no narrowing criterion was provided. |
| `401` | The API key is missing or not valid. |
| `408` | The query did not finish within the synchronous limit. Narrow your filters and retry. |
| `429` | You have exceeded the request rate or the quota included in your plan. |

## Rate Limits

Rate limits and monthly quotas are set by your API.market plan. Each call is a live query against ClinicalTrials.gov and typically takes 5 to 30 seconds, set a client timeout of at least 60 seconds.

## Error Handling

A request with none of `condition`, `intervention`, `sponsor`, `locationTerm`, or `searchTerm` set returns a `400`, at least one narrowing criterion is required. If a broad query does not complete in time, you will receive a `408`, narrowing the condition, location, or adding a status/phase filter resolves this.

## FAQ

**Do I need a ClinicalTrials.gov account or API key?**

No. Only your API.market key is required, the underlying ClinicalTrials.gov API is public.

**How fresh is the data?**

Every call queries ClinicalTrials.gov live, so results reflect the registry at the moment you call, updated continuously as sponsors submit records.

**Why do some sites have named investigators and others don't?**

Investigator names and emails are published only where the sponsor chooses to list them in the registry. Central contacts usually include phone and email; individual site principal investigators are often name-only. This reflects what ClinicalTrials.gov itself publishes, not a limitation of this API.

**What happens if my query is too broad?**

A very broad query with few or no filters can exceed the synchronous time limit and return a `408`. Add a condition, location, status, or phase filter to narrow it.

## Contact Us

If you have any questions or need assistance, you can reach out to us through the embedded chat on the bottom right corner of the page or send an email to hello@magicapi.com.

Search ClinicalTrials.gov by condition, sponsor, phase, status & location. Sponsor class, contacts, sites & named principal investigators. Official NIH API v2, no key.

ClinicalTrials.gov Search API | Trials, Sponsors & Sites

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