# CDISC USDM (DDF) Study Definitions API

**Canonical:** https://apis.io/apis/cdisc/cdisc-usdm-api/  
**Provider:** Cdisc — https://apis.io/providers/cdisc/  
**Documentation:** https://github.com/cdisc-org/usdm_api

CDISC USDM (DDF) Study Definitions API is one of 10 APIs that [Cdisc](https://apis.io/providers/cdisc/) publishes on the [APIs.io](https://apis.io/) network, described by a machine-readable OpenAPI specification. Tagged areas include USDM, Digital Data Flow, and Standards. The published artifact set on APIs.io includes an OpenAPI specification and API documentation.

CDISC-published OpenAPI for the USDM (Unified Study Definitions Model) study-definitions interface from the Digital Data Flow programme — create, update, read and version a study definition and search study designs. The repository describes it as a DDF emulation: a reference contract and implementation for the community rather than a CDISC-operated production service, so no baseURL is recorded.

## Operations (5)

| Method | Path | Summary |
|---|---|---|
| POST | `/v3/studyDefinitions` | Create a study |
| PUT | `/v3/studyDefinitions/{studyId}` | Update a study |
| GET | `/v3/studyDefinitions/{studyId}` | Return a study |
| GET | `/v3/studyDefinitions/{studyId}/history` | Returns the study history |
| GET | `/v3/studyDesigns` | Study designs for a study |

## Machine-readable artifacts (5)

- **OpenAPI** — https://raw.githubusercontent.com/api-evangelist/cdisc/refs/heads/main/openapi/cdisc-usdm-api-openapi.yml
- **Overlay** — https://raw.githubusercontent.com/api-evangelist/cdisc/refs/heads/main/overlays/cdisc-usdm-api-overlay.yaml
- **OpenAPI** — https://raw.githubusercontent.com/cdisc-org/usdm_api/main/docs/USDM_API.yaml
- **SourceCode** — https://github.com/cdisc-org/usdm_api
- **Documentation** — https://www.cdisc.org/ddf

## Other Cdisc APIs (9)

- [CDISC CORE (Checks and Rules Engine) API](https://apis.io/apis/cdisc/cdisc-core-api/)
- [cdisc ADaM API](https://apis.io/apis/cdisc/cdisc-adam-api/)
- [cdisc Biomedical Concepts API](https://apis.io/apis/cdisc/cdisc-biomedical-concepts-api/)
- [cdisc CDASH API](https://apis.io/apis/cdisc/cdisc-cdash-api/)
- [cdisc Products API](https://apis.io/apis/cdisc/cdisc-products-api/)
- [cdisc SDTM API](https://apis.io/apis/cdisc/cdisc-sdtm-api/)
- [cdisc Terminology API](https://apis.io/apis/cdisc/cdisc-terminology-api/)
- [CDISC Analysis Results Standard (ARS) API](https://apis.io/apis/cdisc/cdisc-analysis-results-api/)
- [CDISC Dataset-JSON API (standard specification)](https://apis.io/apis/cdisc/cdisc-dataset-json-api/)

## Tags

USDM, Digital Data Flow, Standards

---

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