Segment HTTP Tracking API

openapi: 3.1.0
info:
  title: Segment HTTP Tracking API
  description: >-
    The Segment HTTP Tracking API enables developers to record analytics
    data from any website or application by sending HTTP requests directly
    to Segment servers. It supports identify, track, page, screen, group,
    alias, and batch calls, and Segment routes the collected data to
    configured destinations. The API accepts batch requests up to 500 KB
    and requires each payload to include a userId or anonymousId. It is
    a server-side alternative to Segment's client-side SDKs.
  version: '1.0.0'
  contact:
    name: Segment Support
    url: https://segment.com/help/
  termsOfService: https://segment.com/legal/terms/
externalDocs:
  description: Segment HTTP Tracking API Documentation
  url: https://segment.com/docs/connections/sources/catalog/libraries/server/http-api/
servers:
  - url: https://api.segment.io/v1
    description: Production Server (US)
  - url: https://events.eu1.segmentapis.com/v1
    description: Production Server (EU)
tags:
  - name: Alias
    description: >-
      Operations for merging two user identities together.
  - name: Batch
    description: >-
      Operations for sending multiple calls in a single request.
  - name: Group
    description: >-
      Operations for associating users with groups or organizations.
  - name: Identify
    description: >-
      Operations for identifying users and associating traits with them.
  - name: Page
    description: >-
      Operations for recording page views on websites.
  - name: Screen
    description: >-
      Operations for recording screen views in mobile applications.
  - name: Track
    description: >-
      Operations for tracking events and actions performed by users.
security:
  - basicAuth: []
paths:
  /identify:
    post:
      operationId: identify
      summary: Identify a user
      description: >-
        Associates a user with their traits. An identify call lets you
        tie a user to their actions and record traits about them. It
        includes a unique user ID and any optional traits you know
        about them, like their email, name, or role.
      tags:
        - Identify
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/IdentifyCall'
      responses:
        '200':
          description: Event accepted successfully.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/SuccessResponse'
        '400':
          description: Invalid request payload.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '401':
          description: Invalid or missing write key.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
  /track:
    post:
      operationId: track
      summary: Track an event
      description: >-
        Records an action that a user performs. A track call requires
        an event name and can include properties that describe the
        event, such as revenue, product details, or other contextual
        information.
      tags:
        - Track
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/TrackCall'
      responses:
        '200':
          description: Event accepted successfully.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/SuccessResponse'
        '400':
          description: Invalid request payload.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '401':
          description: Invalid or missing write key.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
  /page:
    post:
      operationId: page
      summary: Record a page view
      description: >-
        Records a page view on a website. A page call lets you record
        whenever a user sees a page of your website, along with any
        optional properties about the page.
      tags:
        - Page
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/PageCall'
      responses:
        '200':
          description: Event accepted successfully.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/SuccessResponse'
        '400':
          description: Invalid request payload.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '401':
          description: Invalid or missing write key.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
  /screen:
    post:
      operationId: screen
      summary: Record a screen view
      description: >-
        Records a screen view in a mobile application. A screen call
        lets you record whenever a user sees a screen of your mobile
        app, along with optional properties about the screen.
      tags:
        - Screen
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/ScreenCall'
      responses:
        '200':
          description: Event accepted successfully.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/SuccessResponse'
        '400':
          description: Invalid request payload.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '401':
          description: Invalid or missing write key.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
  /group:
    post:
      operationId: group
      summary: Associate user with a group
      description: >-
        Associates an identified user with a group such as a company,
        organization, or account. A group call lets you record which
        group a user belongs to and set traits on the group.
      tags:
        - Group
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/GroupCall'
      responses:
        '200':
          description: Event accepted successfully.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/SuccessResponse'
        '400':
          description: Invalid request payload.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '401':
          description: Invalid or missing write key.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
  /alias:
    post:
      operationId: alias
      summary: Merge two user identities
      description: >-
        Merges two user identities by connecting a previous ID to a
        new user ID. This is an advanced method that is useful when
        you want to associate an anonymous user with an identified
        user after they sign up or log in.
      tags:
        - Alias
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/AliasCall'
      responses:
        '200':
          description: Event accepted successfully.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/SuccessResponse'
        '400':
          description: Invalid request payload.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '401':
          description: Invalid or missing write key.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
  /batch:
    post:
      operationId: batch
      summary: Send a batch of events
      description: >-
        Sends multiple identify, track, page, screen, group, and alias
        calls in a single request. The batch endpoint accepts up to
        500 KB per request and a maximum of 2500 events per batch.
        Each individual event must be less than 32 KB.
      tags:
        - Batch
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/BatchCall'
      responses:
        '200':
          description: Batch accepted successfully.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/SuccessResponse'
        '400':
          description: Invalid request payload.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '401':
          description: Invalid or missing write key.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
components:
  securitySchemes:
    basicAuth:
      type: http
      scheme: basic
      description: >-
        HTTP Basic authentication using the source write key as the
        username and an empty password. The write key is found in the
        Segment source settings.
  schemas:
    SuccessResponse:
      type: object
      properties:
        success:
          type: boolean
          description: >-
            Whether the request was accepted.
    ErrorResponse:
      type: object
      properties:
        success:
          type: boolean
          description: >-
            Always false for error responses.
        message:
          type: string
          description: >-
            A human-readable error message.
    Context:
      type: object
      description: >-
        Dictionary of extra context for the call. Context is a
        dictionary of extra information that provides useful context
        about a data point, such as the user's IP address, locale,
        or device information.
      properties:
        active:
          type: boolean
          description: >-
            Whether the user is active.
        ip:
          type: string
          description: >-
            The IP address of the user.
        locale:
          type: string
          description: >-
            The locale string for the user.
        userAgent:
          type: string
          description: >-
            The user agent string of the client.
        library:
          type: object
          description: >-
            Information about the library making the call.
          properties:
            name:
              type: string
              description: >-
                The name of the library.
            version:
              type: string
              description: >-
                The version of the library.
        page:
          type: object
          description: >-
            Information about the current page.
          properties:
            path:
              type: string
              description: >-
                The path of the page.
            referrer:
              type: string
              format: uri
              description: >-
                The referrer URL.
            search:
              type: string
              description: >-
                The search query string.
            title:
              type: string
              description: >-
                The page title.
            url:
              type: string
              format: uri
              description: >-
                The full URL of the page.
        device:
          type: object
          description: >-
            Information about the user's device.
          properties:
            id:
              type: string
              description: >-
                The device ID.
            manufacturer:
              type: string
              description: >-
                The device manufacturer.
            model:
              type: string
              description: >-
                The device model.
            name:
              type: string
              description: >-
                The device name.
            type:
              type: string
              description: >-
                The device type.
    Integrations:
      type: object
      description: >-
        Dictionary of destinations to enable or disable. Pass a
        destination name as key and true/false as the value to
        control which destinations receive the data.
      additionalProperties:
        oneOf:
          - type: boolean
          - type: object
    IdentifyCall:
      type: object
      description: >-
        An identify call associates a user with their traits.
      properties:
        userId:
          type: string
          description: >-
            Unique identifier for the user in your database.
        anonymousId:
          type: string
          description: >-
            A pseudo-unique substitute for a user ID for cases when
            you do not have an absolutely unique identifier.
        traits:
          type: object
          description: >-
            Free-form dictionary of traits of the user, like email
            or name.
          additionalProperties: true
        context:
          $ref: '#/components/schemas/Context'
        integrations:
          $ref: '#/components/schemas/Integrations'
        timestamp:
          type: string
          format: date-time
          description: >-
            ISO 8601 date string when the message was originally sent.
        messageId:
          type: string
          description: >-
            Unique identifier for the message to deduplicate.
    TrackCall:
      type: object
      required:
        - event
      description: >-
        A track call records an action that a user performs.
      properties:
        userId:
          type: string
          description: >-
            Unique identifier for the user in your database.
        anonymousId:
          type: string
          description: >-
            A pseudo-unique substitute for a user ID.
        event:
          type: string
          description: >-
            Name of the action that a user has performed.
        properties:
          type: object
          description: >-
            Free-form dictionary of properties of the event, like
            revenue or product details.
          additionalProperties: true
        context:
          $ref: '#/components/schemas/Context'
        integrations:
          $ref: '#/components/schemas/Integrations'
        timestamp:
          type: string
          format: date-time
          description: >-
            ISO 8601 date string when the message was originally sent.
        messageId:
          type: string
          description: >-
            Unique identifier for the message to deduplicate.
    PageCall:
      type: object
      description: >-
        A page call records a page view on a website.
      properties:
        userId:
          type: string
          description: >-
            Unique identifier for the user in your database.
        anonymousId:
          type: string
          description: >-
            A pseudo-unique substitute for a user ID.
        name:
          type: string
          description: >-
            Name of the page.
        properties:
          type: object
          description: >-
            Free-form dictionary of properties of the page.
          properties:
            path:
              type: string
              description: >-
                The path portion of the page URL.
            referrer:
              type: string
              format: uri
              description: >-
                The referrer URL.
            search:
              type: string
              description: >-
                The search query string of the URL.
            title:
              type: string
              description: >-
                The page title.
            url:
              type: string
              format: uri
              description: >-
                The full URL of the page.
          additionalProperties: true
        context:
          $ref: '#/components/schemas/Context'
        integrations:
          $ref: '#/components/schemas/Integrations'
        timestamp:
          type: string
          format: date-time
          description: >-
            ISO 8601 date string when the message was originally sent.
        messageId:
          type: string
          description: >-
            Unique identifier for the message to deduplicate.
    ScreenCall:
      type: object
      description: >-
        A screen call records a screen view in a mobile application.
      properties:
        userId:
          type: string
          description: >-
            Unique identifier for the user in your database.
        anonymousId:
          type: string
          description: >-
            A pseudo-unique substitute for a user ID.
        name:
          type: string
          description: >-
            Name of the screen.
        properties:
          type: object
          description: >-
            Free-form dictionary of properties of the screen.
          additionalProperties: true
        context:
          $ref: '#/components/schemas/Context'
        integrations:
          $ref: '#/components/schemas/Integrations'
        timestamp:
          type: string
          format: date-time
          description: >-
            ISO 8601 date string when the message was originally sent.
        messageId:
          type: string
          description: >-
            Unique identifier for the message to deduplicate.
    GroupCall:
      type: object
      required:
        - groupId
      description: >-
        A group call associates an identified user with a group.
      properties:
        userId:
          type: string
          description: >-
            Unique identifier for the user in your database.
        anonymousId:
          type: string
          description: >-
            A pseudo-unique substitute for a user ID.
        groupId:
          type: string
          description: >-
            A unique identifier for the group.
        traits:
          type: object
          description: >-
            Free-form dictionary of traits of the group, like name,
            industry, or number of employees.
          additionalProperties: true
        context:
          $ref: '#/components/schemas/Context'
        integrations:
          $ref: '#/components/schemas/Integrations'
        timestamp:
          type: string
          format: date-time
          description: >-
            ISO 8601 date string when the message was originally sent.
        messageId:
          type: string
          description: >-
            Unique identifier for the message to deduplicate.
    AliasCall:
      type: object
      required:
        - previousId
        - userId
      description: >-
        An alias call merges two user identities.
      properties:
        userId:
          type: string
          description: >-
            The new user ID to associate.
        previousId:
          type: string
          description: >-
            The previous ID to be merged with the user ID.
        context:
          $ref: '#/components/schemas/Context'
        integrations:
          $ref: '#/components/schemas/Integrations'
        timestamp:
          type: string
          format: date-time
          description: >-
            ISO 8601 date string when the message was originally sent.
        messageId:
          type: string
          description: >-
            Unique identifier for the message to deduplicate.
    BatchCall:
      type: object
      required:
        - batch
      description: >-
        A batch call sends multiple events in a single request.
      properties:
        batch:
          type: array
          description: >-
            An array of identify, track, page, screen, group, or alias
            call objects. Maximum 2500 events per batch. Each event
            must be less than 32 KB.
          maxItems: 2500
          items:
            type: object
            required:
              - type
            properties:
              type:
                type: string
                description: >-
                  The type of call.
                enum:
                  - identify
                  - track
                  - page
                  - screen
                  - group
                  - alias
              userId:
                type: string
                description: >-
                  Unique identifier for the user.
              anonymousId:
                type: string
                description: >-
                  A pseudo-unique substitute for a user ID.
              event:
                type: string
                description: >-
                  Event name, required for track calls.
              properties:
                type: object
                description: >-
                  Event or page/screen properties.
                additionalProperties: true
              traits:
                type: object
                description: >-
                  User or group traits.
                additionalProperties: true
              groupId:
                type: string
                description: >-
                  Group ID, required for group calls.
              previousId:
                type: string
                description: >-
                  Previous ID, required for alias calls.
              name:
                type: string
                description: >-
                  Page or screen name.
              context:
                $ref: '#/components/schemas/Context'
              integrations:
                $ref: '#/components/schemas/Integrations'
              timestamp:
                type: string
                format: date-time
                description: >-
                  ISO 8601 date string.
              messageId:
                type: string
                description: >-
                  Unique identifier for the message.
        context:
          $ref: '#/components/schemas/Context'
        integrations:
          $ref: '#/components/schemas/Integrations'