openapi: 3.0.3
info:
  title: Dexcom Developer Alerts Calibrations API
  version: v3
  description: The Dexcom Developer API provides authorized third-party applications with read access to a Dexcom user's continuous glucose monitoring (CGM) data. Resources include estimated glucose values (EGVs), calibrations, events, alerts, devices, and data range. The API uses OAuth 2.0 authorization code flow and exposes separate sandbox and production environments.
  contact:
    name: Dexcom Developer Program
    url: https://developer.dexcom.com/
  termsOfService: https://developer.dexcom.com/terms-of-use
  x-generated-from: documentation
  x-source-url: https://developer.dexcom.com/docs/dexcomv3/endpoint-overview
  x-last-validated: '2026-05-05'
servers:
- url: https://api.dexcom.com
  description: Production (United States)
- url: https://api.dexcom.eu
  description: Production (Europe / International)
- url: https://api.dexcom.jp
  description: Production (Japan)
- url: https://sandbox-api.dexcom.com
  description: Sandbox (Development)
security:
- OAuth2: []
tags:
- name: Calibrations
  description: User calibration entries from fingerstick blood glucose meter readings.
paths:
  /v3/users/self/calibrations:
    get:
      tags:
      - Calibrations
      operationId: getCalibrationsV3
      summary: Get Calibration Entries
      description: Retrieve calibration entries (fingerstick blood glucose meter values entered by the user) between `startDate` and `endDate`.
      parameters:
      - $ref: '#/components/parameters/StartDate'
      - $ref: '#/components/parameters/EndDate'
      responses:
        '200':
          description: Successful calibrations retrieval.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/CalibrationsResponse'
              examples:
                GetCalibrationsV3200Example:
                  summary: Default getCalibrationsV3 200 response
                  x-microcks-default: true
                  value:
                    recordType: calibration
                    recordVersion: '3.0'
                    userId: 35d77a14-243f-4d5d-9f3f-3b3a7d7e9c3a
                    records:
                    - recordId: 7d8e0011-3a55-4b40-9c32-aa991100c001
                      systemTime: '2026-04-30T08:11:30'
                      displayTime: '2026-04-30T01:11:30'
                      unit: mg/dL
                      value: 117
                      displayDevice: receiver
                      transmitterId: 8GA1JK
                      transmitterTicks: 12345610
                      transmitterGeneration: g6
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK
components:
  schemas:
    TransmitterGeneration:
      type: string
      enum:
      - unknown
      - g4
      - g5
      - g6
      - g6+
      - dexcomPro
      - g7
    DateTime:
      type: string
      format: date-time
      description: ISO 8601 timestamp.
    CalibrationRecord:
      type: object
      properties:
        recordId:
          type: string
        systemTime:
          $ref: '#/components/schemas/DateTime'
        displayTime:
          $ref: '#/components/schemas/DateTime'
        unit:
          $ref: '#/components/schemas/GlucoseUnit'
        value:
          type: integer
          format: int32
        displayDevice:
          type: string
        transmitterId:
          type: string
          nullable: true
        transmitterTicks:
          type: integer
          format: int64
        transmitterGeneration:
          $ref: '#/components/schemas/TransmitterGeneration'
    CalibrationsResponse:
      type: object
      properties:
        recordType:
          type: string
          example: calibration
        recordVersion:
          type: string
          example: '3.0'
        userId:
          type: string
        records:
          type: array
          items:
            $ref: '#/components/schemas/CalibrationRecord'
    GlucoseUnit:
      type: string
      enum:
      - unknown
      - mg/dL
      - mmol/L
  parameters:
    StartDate:
      name: startDate
      in: query
      required: true
      description: ISO 8601 timestamp for the start of the query window (UTC, no offset).
      schema:
        type: string
        format: date-time
        example: '2026-04-01T00:00:00'
    EndDate:
      name: endDate
      in: query
      required: true
      description: ISO 8601 timestamp for the end of the query window (UTC, no offset). Must be no more than 30 days after `startDate`.
      schema:
        type: string
        format: date-time
        example: '2026-04-30T23:59:59'
  securitySchemes:
    OAuth2:
      type: oauth2
      description: Dexcom uses OAuth 2.0 authorization code flow. The only acceptable scope value is `offline_access`.
      flows:
        authorizationCode:
          authorizationUrl: https://api.dexcom.com/v2/oauth2/login
          tokenUrl: https://api.dexcom.com/v2/oauth2/token
          refreshUrl: https://api.dexcom.com/v2/oauth2/token
          scopes:
            offline_access: Long-lived access to the user's CGM data via refresh tokens.