openapi: 3.1.0
info:
  title: Segment Pixel Tracking API
  description: >-
    The Segment Pixel Tracking API provides a way to collect analytics
    data using image pixel requests, which is useful in environments where
    JavaScript cannot execute, such as email clients. It supports identify,
    track, page, screen, group, and alias calls through pixel endpoints
    under the api.segment.io domain. Each endpoint responds with a 200
    status code and an empty GIF image. This API is particularly suited
    for tracking email opens, ad impressions, and other contexts where
    embedding a tracking pixel is the only viable data collection method.
  version: '1.0.0'
  contact:
    name: Segment Support
    url: https://segment.com/help/
  termsOfService: https://segment.com/legal/terms/
externalDocs:
  description: Segment Pixel Tracking API Documentation
  url: https://segment.com/docs/connections/sources/catalog/libraries/server/pixel-tracking-api/
servers:
  - url: https://api.segment.io/v1
    description: Production Server
tags:
  - name: Pixel Tracking
    description: >-
      Pixel-based tracking endpoints that accept data via query
      parameters and return a transparent 1x1 GIF image. All data
      is passed as a base64-encoded JSON object in the data query
      parameter.
paths:
  /pixel/identify:
    get:
      operationId: pixelIdentify
      summary: Identify via pixel
      description: >-
        Associates a user with traits via a tracking pixel request.
        The data parameter should contain a base64-encoded JSON object
        with the identify payload. Always returns a 200 response with
        a transparent GIF, even on errors.
      tags:
        - Pixel Tracking
      parameters:
        - $ref: '#/components/parameters/Data'
      responses:
        '200':
          description: >-
            Returns a transparent 1x1 GIF image. The response is
            always 200 regardless of whether the data was valid.
          content:
            image/gif:
              schema:
                type: string
                format: binary
  /pixel/track:
    get:
      operationId: pixelTrack
      summary: Track via pixel
      description: >-
        Records an event via a tracking pixel request. The data
        parameter should contain a base64-encoded JSON object with
        the track payload including the required event field.
      tags:
        - Pixel Tracking
      parameters:
        - $ref: '#/components/parameters/Data'
      responses:
        '200':
          description: >-
            Returns a transparent 1x1 GIF image.
          content:
            image/gif:
              schema:
                type: string
                format: binary
  /pixel/page:
    get:
      operationId: pixelPage
      summary: Page via pixel
      description: >-
        Records a page view via a tracking pixel request. The data
        parameter should contain a base64-encoded JSON object with
        the page payload.
      tags:
        - Pixel Tracking
      parameters:
        - $ref: '#/components/parameters/Data'
      responses:
        '200':
          description: >-
            Returns a transparent 1x1 GIF image.
          content:
            image/gif:
              schema:
                type: string
                format: binary
  /pixel/screen:
    get:
      operationId: pixelScreen
      summary: Screen via pixel
      description: >-
        Records a screen view via a tracking pixel request. The data
        parameter should contain a base64-encoded JSON object with
        the screen payload.
      tags:
        - Pixel Tracking
      parameters:
        - $ref: '#/components/parameters/Data'
      responses:
        '200':
          description: >-
            Returns a transparent 1x1 GIF image.
          content:
            image/gif:
              schema:
                type: string
                format: binary
  /pixel/group:
    get:
      operationId: pixelGroup
      summary: Group via pixel
      description: >-
        Associates a user with a group via a tracking pixel request.
        The data parameter should contain a base64-encoded JSON object
        with the group payload including the required groupId field.
      tags:
        - Pixel Tracking
      parameters:
        - $ref: '#/components/parameters/Data'
      responses:
        '200':
          description: >-
            Returns a transparent 1x1 GIF image.
          content:
            image/gif:
              schema:
                type: string
                format: binary
  /pixel/alias:
    get:
      operationId: pixelAlias
      summary: Alias via pixel
      description: >-
        Merges two user identities via a tracking pixel request.
        The data parameter should contain a base64-encoded JSON
        object with the alias payload including previousId and userId.
      tags:
        - Pixel Tracking
      parameters:
        - $ref: '#/components/parameters/Data'
      responses:
        '200':
          description: >-
            Returns a transparent 1x1 GIF image.
          content:
            image/gif:
              schema:
                type: string
                format: binary
components:
  parameters:
    Data:
      name: data
      in: query
      required: true
      description: >-
        A base64-encoded JSON object containing the call payload.
        Base64 encoding is optional but recommended to prevent special
        character manipulation by browsers or intermediaries. The
        JSON object must include a writeKey field for authentication
        and either a userId or anonymousId for user identification.
      schema:
        type: string