> ## Documentation Index
> Fetch the complete documentation index at: https://chatobserver.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Measure tracked coverage citation evidence

> Measure the same coverage-observations-v2 populations as the dashboard. Supply an inclusive UTC calendar range of at most 366 days; comparison uses the preceding equal-length range. Cohort shared restricts observations to prompt/platform/region cells present in both periods. Citation and brand assessment denominators remain distinct; absent assessments return null rates, not zero. These observations do not establish causation. Items and citation evidence paginate independently, 20 per page. Each request has one database snapshot; later pages may reflect later changes. Requires Sources and coverage availability. Delegated MCP connections require coverage:read.

Required scopes: `read`.


## OpenAPI

````yaml GET /api/v2/coverage/measurement
openapi: 3.1.1
info:
  title: chatobserver public API
  version: '2026-09-09'
  description: >-
    Track AI visibility, manage prompts, inspect collected answers and
    citations, and integrate workspace data with your own tools. Visibility
    endpoints use workspace API keys. Data endpoints use scoped service-account
    keys; spreadsheet client endpoints use authorised client sessions. See the
    authentication guide for each credential type.
  contact:
    name: chatobserver support
    url: https://chatobserver.com/contact
    email: support@chatobserver.com
servers:
  - url: https://app.chatobserver.com
    description: Production API
security:
  - WorkspaceKey: []
  - BearerKey: []
tags:
  - name: Workspace
    description: Validate access and list the workspace project and available platforms.
  - name: Prompts
    description: Create, schedule, organise, activate and retrieve tracked prompts.
  - name: Answers
    description: Retrieve collected AI answers, their analysis and visibility trends.
  - name: Brands
    description: Manage brands and compare their visibility in AI answers.
  - name: Sources and citations
    description: Analyse cited domains, pages and ownership across answers.
  - name: Visitor analytics
    description: Read website visitor and crawler analytics for the workspace.
  - name: Content opportunities
    description: Retrieve content-gap findings and recommendations for tracked prompts.
  - name: Usage
    description: Read workspace consumption and allowance summaries.
  - name: Data connections
    description: Discover authorised connections, source accounts and connector catalogues.
  - name: Data queries
    description: >-
      Create versioned queries, publish definitions and inspect integration
      contracts.
  - name: Data operations
    description: >-
      Execute, validate, cancel and inspect operations and page through result
      rows.
  - name: Data delivery
    description: Manage schedules, transfers, destinations and import workflows.
  - name: Data definitions
    description: Manage reusable definitions and their immutable versions.
  - name: Data webhooks
    description: >-
      Configure event delivery, inspect deliveries, replay events and rotate
      secrets.
  - name: Client authorisation
    description: Authorise spreadsheet clients using a user-approved challenge exchange.
  - name: Spreadsheet clients
    description: >-
      Access document-bound client sessions, queries, schedules, bindings and
      write claims.
  - name: AI visibility audits
    description: Create website visibility audits and retrieve their report links.
  - name: Version 1
    description: Integrate with the version 1 visibility and analytics endpoints.
  - name: Tracked coverage
    description: >-
      Track published coverage, maintain its metadata and inspect exact-page
      citation evidence with the same workspace feature access as the dashboard.
paths:
  /api/v2/coverage/measurement:
    get:
      tags:
        - Tracked coverage
      summary: Measure tracked coverage citation evidence
      description: >-
        Measure the same coverage-observations-v2 populations as the dashboard.
        Supply an inclusive UTC calendar range of at most 366 days; comparison
        uses the preceding equal-length range. Cohort shared restricts
        observations to prompt/platform/region cells present in both periods.
        Citation and brand assessment denominators remain distinct; absent
        assessments return null rates, not zero. These observations do not
        establish causation. Items and citation evidence paginate independently,
        20 per page. Each request has one database snapshot; later pages may
        reflect later changes. Requires Sources and coverage availability.
        Delegated MCP connections require coverage:read.
      operationId: getV2CoverageMeasurement
      parameters:
        - name: startDate
          in: query
          required: true
          schema:
            type: string
            format: date
        - name: endDate
          in: query
          required: true
          schema:
            type: string
            format: date
        - name: attribution
          in: query
          required: false
          schema:
            type: string
            enum:
              - all
              - our_team
              - external
              - unclassified
            default: all
        - name: cohort
          in: query
          required: false
          schema:
            type: string
            enum:
              - shared
              - all
            default: all
        - name: interval
          in: query
          required: false
          schema:
            type: string
            enum:
              - day
              - week
            default: week
        - name: coverageId
          in: query
          required: false
          schema:
            type: string
            format: uuid
        - name: search
          in: query
          required: false
          schema:
            type: string
            maxLength: 200
        - name: archived
          in: query
          required: false
          schema:
            type: string
            enum:
              - 'true'
              - 'false'
        - name: rootDomain
          in: query
          required: false
          schema:
            type: string
            maxLength: 253
        - name: promptId
          in: query
          required: false
          schema:
            type: string
            pattern: ^prm_[1-9][0-9]*$
        - name: groupId
          in: query
          required: false
          schema:
            type: string
            pattern: ^tag_[1-9][0-9]*$
        - name: platform
          in: query
          required: false
          schema:
            type: string
            description: Supported product platform identifier.
            enum:
              - chatgpt
              - ai_overview
              - ai_mode
              - gemini
              - perplexity
              - claude
        - name: region
          in: query
          required: false
          schema:
            type: string
            minLength: 1
            maxLength: 64
        - name: evidencePage
          in: query
          required: false
          schema:
            type: integer
            minimum: 1
            maximum: 100000
            default: 1
        - name: itemsPage
          in: query
          required: false
          schema:
            type: integer
            minimum: 1
            maximum: 100000
            default: 1
        - name: evidenceStart
          in: query
          required: false
          schema:
            type: string
            format: date
        - name: evidenceEnd
          in: query
          required: false
          schema:
            type: string
            format: date
      responses:
        '200':
          description: Successful result.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/CoverageMeasurementResponse'
        default:
          description: >-
            Request failed. Inspect the error code and request identifier; retry
            only when the failure is retryable.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ApiError'
      security:
        - WorkspaceKey: []
        - BearerKey: []
        - McpConnection: []
components:
  schemas:
    CoverageMeasurementResponse:
      type: object
      properties:
        data:
          type: object
          properties:
            definitionVersion:
              type: string
              enum:
                - coverage-observations-v2
            capturedAt:
              type: string
              format: date-time
            scope:
              $ref: '#/components/schemas/CoverageMeasurementScope'
            previousRange:
              type: object
              properties:
                startDate:
                  type: string
                  format: date
                endDate:
                  type: string
                  format: date
              required:
                - startDate
                - endDate
              additionalProperties: false
            current:
              $ref: '#/components/schemas/CoverageMeasure'
            previous:
              $ref: '#/components/schemas/CoverageMeasure'
            population:
              type: object
              properties:
                currentCells:
                  type: integer
                  minimum: 0
                previousCells:
                  type: integer
                  minimum: 0
                sharedCells:
                  type: integer
                  minimum: 0
                currentAnswers:
                  type: integer
                  minimum: 0
                previousAnswers:
                  type: integer
                  minimum: 0
              required:
                - currentCells
                - previousCells
                - sharedCells
                - currentAnswers
                - previousAnswers
              additionalProperties: false
            trend:
              type: array
              items:
                type: object
                properties:
                  answers:
                    type: integer
                    minimum: 0
                  assessed:
                    type: integer
                    minimum: 0
                  citing:
                    type: integer
                    minimum: 0
                  brandAssessed:
                    type: integer
                    minimum: 0
                  brandMentioned:
                    type: integer
                    minimum: 0
                  citationRate:
                    type:
                      - number
                      - 'null'
                    minimum: 0
                    maximum: 1
                    description: >-
                      Citing answers divided by citation-assessed answers; null
                      when none were assessed.
                  visibilityRate:
                    type:
                      - number
                      - 'null'
                    minimum: 0
                    maximum: 1
                    description: >-
                      Brand-mentioned answers divided by brand-assessed answers;
                      null when none were assessed.
                  date:
                    type: string
                    format: date
                  endDate:
                    type: string
                    format: date
                required:
                  - answers
                  - assessed
                  - citing
                  - brandAssessed
                  - brandMentioned
                  - citationRate
                  - visibilityRate
                  - date
                  - endDate
                additionalProperties: false
            previousTrend:
              type: array
              items:
                type: object
                properties:
                  answers:
                    type: integer
                    minimum: 0
                  assessed:
                    type: integer
                    minimum: 0
                  citing:
                    type: integer
                    minimum: 0
                  brandAssessed:
                    type: integer
                    minimum: 0
                  brandMentioned:
                    type: integer
                    minimum: 0
                  citationRate:
                    type:
                      - number
                      - 'null'
                    minimum: 0
                    maximum: 1
                    description: >-
                      Citing answers divided by citation-assessed answers; null
                      when none were assessed.
                  visibilityRate:
                    type:
                      - number
                      - 'null'
                    minimum: 0
                    maximum: 1
                    description: >-
                      Brand-mentioned answers divided by brand-assessed answers;
                      null when none were assessed.
                  date:
                    type: string
                    format: date
                  endDate:
                    type: string
                    format: date
                required:
                  - answers
                  - assessed
                  - citing
                  - brandAssessed
                  - brandMentioned
                  - citationRate
                  - visibilityRate
                  - date
                  - endDate
                additionalProperties: false
            items:
              type: array
              items:
                type: object
                properties:
                  url:
                    type: string
                    maxLength: 4096
                    description: >-
                      Published HTTP(S) page URL. The same page identity rules
                      as the dashboard apply.
                  title:
                    type:
                      - string
                      - 'null'
                    maxLength: 500
                  publisher:
                    type:
                      - string
                      - 'null'
                    maxLength: 200
                  publishedOn:
                    type:
                      - string
                      - 'null'
                    format: date
                  medium:
                    type: string
                    enum:
                      - article
                      - interview
                      - podcast
                      - broadcast
                      - other
                  attribution:
                    type: string
                    enum:
                      - unclassified
                      - our_team
                      - external
                  notes:
                    type:
                      - string
                      - 'null'
                    maxLength: 4000
                  id:
                    type: string
                    format: uuid
                  version:
                    type: integer
                    minimum: 1
                  createdAt:
                    type: string
                    format: date-time
                  updatedAt:
                    type: string
                    format: date-time
                  archivedAt:
                    type:
                      - string
                      - 'null'
                    format: date-time
                  citingAnswers:
                    type:
                      - integer
                      - 'null'
                    minimum: 0
                  previousCitingAnswers:
                    type:
                      - integer
                      - 'null'
                    minimum: 0
                required:
                  - url
                  - title
                  - publisher
                  - publishedOn
                  - medium
                  - attribution
                  - notes
                  - id
                  - version
                  - createdAt
                  - updatedAt
                  - archivedAt
                  - citingAnswers
                  - previousCitingAnswers
                additionalProperties: false
            itemPageInfo:
              type: object
              properties:
                page:
                  type: integer
                  minimum: 1
                pageSize:
                  type: integer
                  enum:
                    - 20
                total:
                  type: integer
                  minimum: 0
                hasMore:
                  type: boolean
              required:
                - page
                - pageSize
                - total
                - hasMore
              additionalProperties: false
            evidence:
              type: object
              properties:
                answerCount:
                  type: integer
                firstObservedAt:
                  type:
                    - string
                    - 'null'
                  format: date-time
                lastObservedAt:
                  type:
                    - string
                    - 'null'
                  format: date-time
                page:
                  type: integer
                pageSize:
                  type: integer
                answers:
                  type: array
                  items:
                    type: object
                    properties:
                      responseId:
                        type: string
                        pattern: ^rsp_[0-9]+$
                      promptId:
                        type: string
                        pattern: ^prm_[0-9]+$
                      promptLabel:
                        type:
                          - string
                          - 'null'
                      completedAt:
                        type:
                          - string
                          - 'null'
                        format: date-time
                      platform:
                        type:
                          - string
                          - 'null'
                        description: >-
                          Approved product platform identifier, or null if
                          unavailable.
                        enum:
                          - chatgpt
                          - ai_overview
                          - ai_mode
                          - gemini
                          - perplexity
                          - claude
                          - null
                      regionCode:
                        type:
                          - string
                          - 'null'
                      sourceUrl:
                        type: string
                    required:
                      - responseId
                      - promptId
                      - promptLabel
                      - completedAt
                      - platform
                      - regionCode
                      - sourceUrl
                    additionalProperties: false
              required:
                - answerCount
                - firstObservedAt
                - lastObservedAt
                - page
                - pageSize
                - answers
              additionalProperties: false
          required:
            - definitionVersion
            - capturedAt
            - scope
            - previousRange
            - current
            - previous
            - population
            - trend
            - previousTrend
            - items
            - itemPageInfo
            - evidence
          additionalProperties: false
      required:
        - data
      additionalProperties: false
    ApiError:
      type: object
      properties:
        error:
          type: object
          properties:
            code:
              type: string
            message:
              type: string
            details: {}
          required:
            - code
            - message
        requestId:
          type: string
      required:
        - error
        - requestId
    CoverageMeasurementScope:
      type: object
      properties:
        startDate:
          type: string
          format: date
        endDate:
          type: string
          format: date
        attribution:
          type: string
          enum:
            - all
            - our_team
            - external
            - unclassified
          default: all
        cohort:
          type: string
          enum:
            - shared
            - all
          default: all
        interval:
          type: string
          enum:
            - day
            - week
          default: week
        coverageId:
          type: string
          format: uuid
        search:
          type: string
          maxLength: 200
        archived:
          type: boolean
        rootDomain:
          type: string
          maxLength: 253
        promptId:
          type: string
          pattern: ^prm_[1-9][0-9]*$
        groupId:
          type: string
          pattern: ^tag_[1-9][0-9]*$
        platform:
          type: string
          description: Supported product platform identifier.
          enum:
            - chatgpt
            - ai_overview
            - ai_mode
            - gemini
            - perplexity
            - claude
        region:
          type: string
          minLength: 1
          maxLength: 64
      required:
        - startDate
        - endDate
        - attribution
        - cohort
        - interval
      additionalProperties: false
    CoverageMeasure:
      type: object
      properties:
        answers:
          type: integer
          minimum: 0
        assessed:
          type: integer
          minimum: 0
        citing:
          type: integer
          minimum: 0
        brandAssessed:
          type: integer
          minimum: 0
        brandMentioned:
          type: integer
          minimum: 0
        citationRate:
          type:
            - number
            - 'null'
          minimum: 0
          maximum: 1
          description: >-
            Citing answers divided by citation-assessed answers; null when none
            were assessed.
        visibilityRate:
          type:
            - number
            - 'null'
          minimum: 0
          maximum: 1
          description: >-
            Brand-mentioned answers divided by brand-assessed answers; null when
            none were assessed.
      required:
        - answers
        - assessed
        - citing
        - brandAssessed
        - brandMentioned
        - citationRate
        - visibilityRate
      additionalProperties: false
  securitySchemes:
    WorkspaceKey:
      type: apiKey
      in: header
      name: x-chatobserver-key
      description: >-
        A workspace API key. Data endpoints require a service-account key with
        the specified scopes.
    BearerKey:
      type: http
      scheme: bearer
      description: The workspace or service-account API key as a bearer token.
    McpConnection:
      type: http
      scheme: bearer
      description: >-
        Delegated application credential issued after Chatobserver account
        consent. Restricted to selected workspaces and explicitly supported MCP
        operations. The MCP server access token is a separate credential and
        cannot be used here.

````