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Full detail: Where this data comes from
Castor (Castor EDC / CDMS) is a cloud electronic data capture (EDC) and clinical data management platform for clinical trials and real-world research. Its RESTful API at https://data.castoredc.com/api exposes study configuration and collected data - studies, participants (records), institutes (sites), users, fields and field metadata, study data points, repeating data (reports), surveys and survey packages, audit trail, and batch data export - authenticated with OAuth2 client-credentials. The API powers integrations with external systems, automated data entry and extraction, and statistical analysis via the official R and Python wrapper packages.
APIs.json: https://raw.githubusercontent.com/api-evangelist/castoredc/refs/heads/main/apis.yml
- Clinical Trials
- Electronic Data Capture
- EDC
- Clinical Data Management
- Healthcare
- Life Sciences
- Research
- Created: 2026-07-05
- Modified: 2026-07-05
The Castor API uses OAuth2 with the Client Credentials flow. Generate an API Client ID and Client Secret from your Castor User Settings, then request an access token from POST https://data.castoredc.com/api/oauth/token with grant_type=client_credentials. Tokens are valid for 5 hours and are passed as a Bearer token on every request. Most IDs (study, field, report/repeating-data instance, survey package instance) are uppercase GUIDs in 8-4-4-4-12 format; the participant ID is the exception.
List the studies your API client can access and retrieve a single study's configuration and metadata. A study is the top-level container in Castor; its GUID (the study_id) is required by nearly every other endpoint.
- Human URL: https://helpdesk.castoredc.com/hc/en-us/articles/27149233860509-Castor-EDC-CDMS-Application-Programming-Interface-API
- Base URL:
https://data.castoredc.com/api
- Studies
- Metadata
- Configuration
- Documentation
- API Reference
- OpenAPI — OpenAPI Specification
- Postman Collection — Postman Collection 2.1
- Open Collection — Open Collection 1.0
Create, list, and retrieve participants (records / subjects) enrolled in a study, including their institute assignment, randomization status, progress, and lifecycle. Participants are the entities that data points are collected against.
- Human URL: https://data.castoredc.com/api
- Base URL:
https://data.castoredc.com/api
- Participants
- Records
- Subjects
- API Reference
- OpenAPI — OpenAPI Specification
- Postman Collection — Postman Collection 2.1
- Open Collection — Open Collection 1.0
List and retrieve the institutes (sites / centers) participating in a study, and create new institutes. Institutes group participants for multi-center trials and drive site-level access control and reporting.
- Human URL: https://data.castoredc.com/api
- Base URL:
https://data.castoredc.com/api
- Institutes
- Sites
- Multi-Center
- API Reference
- OpenAPI — OpenAPI Specification
- Postman Collection — Postman Collection 2.1
- Open Collection — Open Collection 1.0
List the users the authenticated account can see, retrieve a single user, and list the users who are members of a given study. Used to reconcile study membership and site staff with external identity and CTMS systems.
- Human URL: https://data.castoredc.com/api
- Base URL:
https://data.castoredc.com/api
- Users
- Access
- Membership
- API Reference
- OpenAPI — OpenAPI Specification
- Postman Collection — Postman Collection 2.1
- Open Collection — Open Collection 1.0
Retrieve the data-capture fields that define a study's forms, plus their supporting metadata - field dependencies (conditional logic), option groups (answer choices), and field validations. This is the schema you need to interpret and write study data points correctly.
- Human URL: https://data.castoredc.com/api
- Base URL:
https://data.castoredc.com/api
- Fields
- Field Metadata
- Option Groups
- API Reference
- OpenAPI — OpenAPI Specification
- Postman Collection — Postman Collection 2.1
- Open Collection — Open Collection 1.0
Read and write the actual collected values (data points) for the study forms of a participant - retrieve all study data points for a study or a single participant, and create or update participant study data points programmatically.
- Human URL: https://data.castoredc.com/api
- Base URL:
https://data.castoredc.com/api
- Data Points
- Data Entry
- Data Extraction
- API Reference
- OpenAPI — OpenAPI Specification
- Postman Collection — Postman Collection 2.1
- Open Collection — Open Collection 1.0
Work with reports (now called repeating data) - unscheduled or repeatable forms such as adverse events or medications. List report definitions, list and create repeating-data instances for a participant, and read or write their data points.
- Human URL: https://data.castoredc.com/api
- Base URL:
https://data.castoredc.com/api
- Reports
- Repeating Data
- Instances
- API Reference
- OpenAPI — OpenAPI Specification
- Postman Collection — Postman Collection 2.1
- Open Collection — Open Collection 1.0
Manage surveys and electronic patient-reported outcomes (ePRO) - list survey definitions, send survey packages to participants (creating survey-package instances), check survey compliance, and read survey data points and instances.
- Human URL: https://data.castoredc.com/api
- Base URL:
https://data.castoredc.com/api
- Surveys
- ePRO
- Survey Packages
- API Reference
- OpenAPI — OpenAPI Specification
- Postman Collection — Postman Collection 2.1
- Open Collection — Open Collection 1.0
Retrieve the immutable audit trail for a study - the who, what, and when of every data and configuration change - to support GCP / 21 CFR Part 11 compliance, monitoring, and reconciliation with external quality systems.
- Human URL: https://data.castoredc.com/api
- Base URL:
https://data.castoredc.com/api
- Audit Trail
- Compliance
- GCP
- API Reference
- OpenAPI — OpenAPI Specification
- Postman Collection — Postman Collection 2.1
- Open Collection — Open Collection 1.0
Request and download bulk exports of a study - the collected data, the study structure, and the option groups - for downstream statistical analysis, archiving, and data warehousing.
- Human URL: https://data.castoredc.com/api
- Base URL:
https://data.castoredc.com/api
- Export
- Bulk Data
- Structure
- API Reference
- OpenAPI — OpenAPI Specification
- Postman Collection — Postman Collection 2.1
- Open Collection — Open Collection 1.0
FN: Kin Lane Email: kin@apievangelist.com