# NCI Clinical Trials Search API

**Canonical:** https://apis.io/apis/cancer-gov/clinical-trials-api/  
**Provider:** Cancer.gov — https://apis.io/providers/cancer-gov/  
**Base URL:** https://clinicaltrialsapi.cancer.gov/api/v2  
**Documentation:** https://clinicaltrialsapi.cancer.gov/

NCI Clinical Trials Search API is one of 10 APIs that [Cancer.gov](https://apis.io/providers/cancer-gov/) publishes on the [APIs.io](https://apis.io/) network. Tagged areas include Clinical Trials, CTRP, and Research. The published artifact set on APIs.io includes API documentation.

RESTful API that lets developers build applications, search tools, and digital platforms over NCI-supported cancer clinical trials data sourced from NCI's Clinical Trials Reporting Program (CTRP). The same API powers NCI's public Clinical Trials Search. Developers register for a free API key through the CTS Developer Accounts portal.

## Machine-readable artifacts (4)

- **Documentation** — https://clinicaltrialsapi.cancer.gov/
- **Signup** — https://clinicaltrialsapi.cancer.gov/
- **ParentPage** — https://www.cancer.gov/syndication/api
- **APIsJSON** — https://raw.githubusercontent.com/api-evangelist/cancer-gov/refs/heads/main/apis.yml

## Other Cancer.gov APIs (9)

- [NCI Genomic Data Commons (GDC) API](https://apis.io/apis/cancer-gov/gdc-api/)
- [NCI SEER API](https://apis.io/apis/cancer-gov/seer-api/)
- [NCI MoDaC API](https://apis.io/apis/cancer-gov/modac-api/)
- [NCI EVS Terminology API](https://apis.io/apis/cancer-gov/evs-api/)
- [NCI Content Syndication Services](https://apis.io/apis/cancer-gov/syndication-services/)
- [Cancer.gov Diseases API](https://apis.io/apis/cancer-gov/cancer-gov-diseases-api/)
- [Cancer.gov Interventions API](https://apis.io/apis/cancer-gov/cancer-gov-interventions-api/)
- [Cancer.gov Terms API](https://apis.io/apis/cancer-gov/cancer-gov-terms-api/)
- [Cancer.gov Trials API](https://apis.io/apis/cancer-gov/cancer-gov-trials-api/)

## Tags

Clinical Trials, CTRP, Research

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/cancer-gov/clinical-trials-api/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/cancer-gov/.