Castor

Castor Surveys API

Surveys, survey packages, and ePRO.

Documentation GitHub OpenAPI

Business capability

Operations 4

GET /study/{study_id}/survey List surveys #

GET /study/{study_id}/participant/{participant_id}/data-points/survey-instance List a participant's survey instances #

POST /study/{study_id}/participant/{participant_id}/data-points/survey-package-instance Send a survey package to a participant #

POST /study/{study_id}/compliance Retrieve participant survey compliance #

Work with this as data

Every API here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for apis

7 MCP tools reach this

find_apisBrowse and filter every API in the catalog.
get_api_artifactsOne API's artifacts, grouped by type.
get_openapiThe primary OpenAPI for this API.
find_similar_apisAPIs that look like this one.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools →

Call it yourself

curl for this page

This API

curl "https://apis.io/api/v1/apis/castoredc-surveys-api"

All apis

curl "https://apis.io/api/v1/apis?limit=25"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.

OpenAPI Specification

openapi: 3.2.0
info:
  title: Castor EDC / CDMS Surveys API
  description: The Castor EDC / CDMS API is a RESTful interface to Castor's cloud electronic data capture (EDC) and clinical data management platform.
  version: '1.0'
  contact:
    name: Castor
    url: https://www.castoredc.com
  license:
    name: Proprietary
    url: https://www.castoredc.com/legal/
servers:
- url: https://data.castoredc.com/api
  description: Castor EU (default)
- url: https://us.castoredc.com/api
  description: Castor US region
security:
- oauth2ClientCredentials: []
tags:
- name: Surveys
  description: Surveys, survey packages, and ePRO.
paths:
  /study/{study_id}/survey:
    get:
      operationId: listSurveys
      tags:
      - Surveys
      summary: List surveys
      description: Lists the survey and ePRO definitions configured in a study.
      x-endpoint-status: confirmed
      parameters:
      - $ref: '#/components/parameters/StudyId'
      responses:
        '200':
          description: A list of surveys.
          content:
            application/json:
              schema:
                type: object
  /study/{study_id}/participant/{participant_id}/data-points/survey-instance:
    get:
      operationId: listSurveyInstances
      tags:
      - Surveys
      summary: List a participant's survey instances
      description: Retrieves the survey instances (and their data points) for a participant.
      x-endpoint-status: confirmed
      parameters:
      - $ref: '#/components/parameters/StudyId'
      - $ref: '#/components/parameters/ParticipantId'
      responses:
        '200':
          description: A list of survey instances.
          content:
            application/json:
              schema:
                type: object
  /study/{study_id}/participant/{participant_id}/data-points/survey-package-instance:
    post:
      operationId: createSurveyPackageInstance
      tags:
      - Surveys
      summary: Send a survey package to a participant
      description: Creates a survey-package instance, sending one or more surveys to a participant (for example, by email invitation).
      x-endpoint-status: confirmed
      parameters:
      - $ref: '#/components/parameters/StudyId'
      - $ref: '#/components/parameters/ParticipantId'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                survey_package_id:
                  type: string
                email_address:
                  type: string
      responses:
        '201':
          description: The created survey-package instance.
          content:
            application/json:
              schema:
                type: object
  /study/{study_id}/compliance:
    post:
      operationId: getSurveyCompliance
      tags:
      - Surveys
      summary: Retrieve participant survey compliance
      description: Returns survey compliance information for participants in a study.
      x-endpoint-status: confirmed
      parameters:
      - $ref: '#/components/parameters/StudyId'
      responses:
        '200':
          description: Survey compliance information.
          content:
            application/json:
              schema:
                type: object
components:
  parameters:
    ParticipantId:
      name: participant_id
      in: path
      required: true
      description: The participant (record) ID.
      schema:
        type: string
    StudyId:
      name: study_id
      in: path
      required: true
      description: The study GUID (uppercase, 8-4-4-4-12 format).
      schema:
        type: string
  securitySchemes:
    oauth2ClientCredentials:
      type: oauth2
      flows:
        clientCredentials:
          tokenUrl: https://data.castoredc.com/api/oauth/token
          scopes: {}