Dexcom Estimated Glucose Values API

openapi: 3.2.0
info:
  title: Dexcom Developer Alerts Estimated Glucose Values 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: Estimated Glucose Values
  description: Time-series CGM glucose readings for the authorized user.
paths:
  /v3/users/self/egvs:
    get:
      tags:
      - Estimated Glucose Values
      operationId: getEgvsV3
      summary: Get Estimated Glucose Values
      description: Retrieve estimated glucose values (EGVs) for the authorized user between `startDate` and `endDate`. The maximum window is 30 days and timestamps are interpreted against the device `systemTime` field.
      parameters:
      - $ref: '#/components/parameters/StartDate'
      - $ref: '#/components/parameters/EndDate'
      responses:
        '200':
          description: Successful EGV retrieval.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/EgvsResponse'
              examples:
                GetEgvsV3200Example:
                  summary: Default getEgvsV3 200 response
                  x-microcks-default: true
                  value:
                    recordType: egv
                    recordVersion: '3.0'
                    userId: 35d77a14-243f-4d5d-9f3f-3b3a7d7e9c3a
                    records:
                    - recordId: 1f3a9b56-1f4f-4c70-9d2c-bb4f5d6e0001
                      systemTime: '2026-04-30T15:00:00'
                      displayTime: '2026-04-30T08:00:00'
                      transmitterId: 8GA1JK
                      transmitterTicks: 12345678
                      value: 142
                      status: ok
                      trend: flat
                      trendRate: 0.3
                      unit: mg/dL
                      rateUnit: mg/dL/min
                      displayDevice: iOS
                      transmitterGeneration: g7
                    - recordId: 1f3a9b56-1f4f-4c70-9d2c-bb4f5d6e0002
                      systemTime: '2026-04-30T15:05:00'
                      displayTime: '2026-04-30T08:05:00'
                      transmitterId: 8GA1JK
                      transmitterTicks: 12345978
                      value: 148
                      status: ok
                      trend: fortyFiveUp
                      trendRate: 1.2
                      unit: mg/dL
                      rateUnit: mg/dL/min
                      displayDevice: iOS
                      transmitterGeneration: g7
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK
components:
  schemas:
    RateUnit:
      type: string
      enum:
      - unknown
      - mg/dL/min
      - mmol/L/min
    EGVRecord:
      type: object
      description: A single estimated glucose value record.
      x-schema-source: documentation
      x-source-url: https://developer.dexcom.com/docs/dexcomv3/endpoint-overview
      properties:
        recordId:
          type: string
        systemTime:
          $ref: '#/components/schemas/DateTime'
        displayTime:
          $ref: '#/components/schemas/DateTime'
        transmitterId:
          type:
          - string
          - 'null'
        transmitterTicks:
          type: integer
          format: int64
        value:
          type: integer
          format: int32
          description: Estimated glucose value, in `unit`.
        status:
          $ref: '#/components/schemas/EgvStatus'
        trend:
          $ref: '#/components/schemas/TrendType'
        trendRate:
          type:
          - number
          - 'null'
          format: double
        unit:
          $ref: '#/components/schemas/GlucoseUnit'
        rateUnit:
          $ref: '#/components/schemas/RateUnit'
        displayDevice:
          type: string
          description: One of `iOS`, `android`, or `receiver`.
        transmitterGeneration:
          $ref: '#/components/schemas/TransmitterGeneration'
    DateTime:
      type: string
      format: date-time
      description: ISO 8601 timestamp.
    EgvsResponse:
      type: object
      properties:
        recordType:
          type: string
          example: egv
        recordVersion:
          type: string
          example: '3.0'
        userId:
          type: string
        records:
          type: array
          items:
            $ref: '#/components/schemas/EGVRecord'
    EgvStatus:
      type: string
      enum:
      - unknown
      - high
      - low
      - ok
    TransmitterGeneration:
      type: string
      enum:
      - unknown
      - g4
      - g5
      - g6
      - g6+
      - dexcomPro
      - g7
    GlucoseUnit:
      type: string
      enum:
      - unknown
      - mg/dL
      - mmol/L
    TrendType:
      type: string
      enum:
      - none
      - unknown
      - doubleUp
      - singleUp
      - fortyFiveUp
      - flat
      - fortyFiveDown
      - singleDown
      - doubleDown
      - notComputable
      - rateOutOfRange
  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.