Matomo

Matomo Cohorts API

Exposes cohort reports grouped by the period of a visitor's first visit. These endpoints transform archived first-visit cohort data into table and chart responses for the Cohorts plugin.

GitHub OpenAPI

Operations 2

Each operation below carries the questions people ask an LLM about it and the instructions they give an agent to run it. Generated by API Evangelist overlay

GET /index.php?module=API&method=Cohorts.getCohortsOverTime Track chosen cohorts over a date range · Cohorts get cohorts over time #
Ask an LLM
“How did visitors who first arrived in January keep returning over the following months?”
“Can I follow specific cohort start dates across a display range?”
Tell an agent
Show cohorts {cohorts} on site {idSite} by {period} over {displayDateRange}.
Track retention of the {cohorts} cohorts across {displayDateRange}.
GET /index.php?module=API&method=Cohorts.getCohorts Get the cohort retention table for a period · Cohorts get cohorts #
Ask an LLM
“What does my visitor retention cohort table look like this month?”
“Can I build cohorts on a metric other than returning visitors?”
Tell an agent
Get the cohort table for site {idSite} for {period} {date}.
Show cohorts measured by {metric} for site {idSite} on {date}.

Documentation

📖
Documentation
https://developer.matomo.org/api-reference/reporting-api
📖
Documentation
https://developer.matomo.org/api-reference/reporting-api#Live
📖
Documentation
https://developer.matomo.org/api-reference/reporting-api#Goals
📖
Documentation
https://developer.matomo.org/api-reference/reporting-api-segmentation

Specifications

⚙
OpenAPI
https://raw.githubusercontent.com/api-evangelist/matomo/refs/heads/main/openapi/matomo-cohorts-api-openapi.yml

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OpenAPI Specification

matomo-cohorts-api-openapi.yml Raw ↑ 
openapi: 3.2.0
info:
  title: Matomo Reporting API for plugin Cohorts API
  version: 1.0.0
  description: Exposes cohort reports grouped by the period of a visitor's first visit. These endpoints transform archived first-visit cohort data into table and chart responses for the Cohorts plugin.
servers:
- url: https://demo-proxy.innocraft.cloud/
  description: Current Matomo instance
security:
- MatomoToken: []
tags:
- name: Cohorts
  description: Exposes cohort reports grouped by the period of a visitor's first visit. These endpoints transform archived first-visit cohort data into table and chart responses for the Cohorts plugin.
paths:
  /index.php?module=API&method=Cohorts.getCohortsOverTime:
    get:
      tags:
      - Cohorts
      description: Returns cohort metrics over time for the requested cohort start dates.
      operationId: Cohorts.getCohortsOverTime
      parameters:
      - $ref: '#/components/parameters/formatOptional'
      - name: idSite
        in: query
        description: The numeric ID of the website to query.
        required: true
        schema:
          type: integer
          example: 1
      - name: period
        in: query
        description: The period to process, processes data for the period containing the specified date.
        required: true
        schema:
          type: string
          enum:
          - day
          - week
          - month
          - year
          - range
          example: day
      - name: displayDateRange
        in: query
        description: The date range to process. 'YYYY-MM-DD', magic keywords (today, yesterday, lastWeek, lastMonth, lastYear), or date range (ie, 'YYYY-MM-DD,YYYY-MM-DD', lastX, previousX).
        required: true
        schema:
          type: string
          example: 2026-05-01,2026-05-07
      - name: cohorts
        in: query
        description: Comma-separated cohort start dates in `YYYY-MM-DD` format.
        required: true
        schema:
          type: string
          example: 2026-05-01,2026-05-07
      - name: segment
        in: query
        description: 'Custom segment to filter the report. Example: "referrerName==example.com" Supports AND (;) and OR (,) operators.'
        required: false
        schema:
          type: string
      - name: filter_limit
        in: query
        description: The maximum number of periods to include from each cohort start, or `false` to use the configured default.
        required: false
        schema:
          oneOf:
          - type: integer
          - type: string
      responses:
        '200':
          description: 'Data tables keyed by time period containing the selected cohorts.


            Example responses require Super User access. Use Try it out to see a live response.'
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '403':
          $ref: '#/components/responses/Forbidden'
        '404':
          $ref: '#/components/responses/NotFound'
        '500':
          $ref: '#/components/responses/ServerError'
        default:
          $ref: '#/components/responses/DefaultError'
      summary: Cohorts get cohorts over time
      x-summary-source: derived
  /index.php?module=API&method=Cohorts.getCohorts:
    get:
      tags:
      - Cohorts
      description: Returns cohort data for the selected period and metric.
      operationId: Cohorts.getCohorts
      parameters:
      - $ref: '#/components/parameters/formatOptional'
      - name: idSite
        in: query
        description: The numeric ID of the website to query.
        required: true
        schema:
          type: integer
          example: 1
      - name: period
        in: query
        description: The period to process, processes data for the period containing the specified date.
        required: true
        schema:
          type: string
          enum:
          - day
          - week
          - month
          - year
          - range
          example: day
      - name: date
        in: query
        description: The date or date range to process. 'YYYY-MM-DD', magic keywords (today, yesterday, lastWeek, lastMonth, lastYear), or date range (ie, 'YYYY-MM-DD,YYYY-MM-DD', lastX, previousX).
        required: true
        schema:
          type: string
          example: yesterday
      - name: metric
        in: query
        description: The metric to return, or `null` to return all cohort metrics.
        required: false
        schema:
          type: string
      - name: segment
        in: query
        description: 'Custom segment to filter the report. Example: "referrerName==example.com" Supports AND (;) and OR (,) operators.'
        required: false
        schema:
          type: string
      - name: filter_limit
        in: query
        description: The maximum number of periods to include from each cohort start, or `false` to use the configured default.
        required: false
        schema:
          oneOf:
          - type: integer
          - type: string
      - name: formatMetics
        in: query
        description: Metric formatting mode to pass to the archive request, for example `all`.
        required: false
        schema:
          oneOf:
          - type: string
            default: all
          - type: integer
      responses:
        '200':
          description: 'Cohort rows keyed by first-visit period for the requested metric selection.


            Example responses require Super User access. Use Try it out to see a live response.'
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '403':
          $ref: '#/components/responses/Forbidden'
        '404':
          $ref: '#/components/responses/NotFound'
        '500':
          $ref: '#/components/responses/ServerError'
        default:
          $ref: '#/components/responses/DefaultError'
      summary: Cohorts get cohorts
      x-summary-source: derived
components:
  responses:
    Forbidden:
      description: Authenticated but not allowed to access the resource.
      content:
        text/plain:
          schema:
            type: string
          example: 'Error: Not authorised.'
        text/html:
          schema:
            type: string
          example: Not authorised.
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
        application/xml:
          schema:
            $ref: '#/components/schemas/ErrorXml'
    BadRequest:
      description: Bad request (validation or missing parameters).
      content:
        text/plain:
          schema:
            type: string
          example: 'Error: There was an error.'
        text/html:
          schema:
            type: string
          example: There was an error.
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
        application/xml:
          schema:
            $ref: '#/components/schemas/ErrorXml'
    NotFound:
      description: Resource not found.
      content:
        text/plain:
          schema:
            type: string
          example: 'Error: The method is not available.'
        text/html:
          schema:
            type: string
          example: The method is not available.
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
        application/xml:
          schema:
            $ref: '#/components/schemas/ErrorXml'
    Unauthorized:
      description: Authentication failed or missing token.
      content:
        text/plain:
          schema:
            type: string
          example: 'Error: You must be logged in to access this functionality.'
        text/html:
          schema:
            type: string
          example: You must be logged in to access this functionality.
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
        application/xml:
          schema:
            $ref: '#/components/schemas/ErrorXml'
    ServerError:
      description: Unexpected server error.
      content:
        text/plain:
          schema:
            type: string
          example: 'Error: There was an error.'
        text/html:
          schema:
            type: string
          example: There was an error.
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
        application/xml:
          schema:
            $ref: '#/components/schemas/ErrorXml'
    DefaultError:
      description: Default error response (any non-2xx).
      content:
        text/plain:
          schema:
            type: string
          example: 'Error: There was an error.'
        text/html:
          schema:
            type: string
          example: There was an error.
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
        application/xml:
          schema:
            $ref: '#/components/schemas/ErrorXml'
  schemas:
    ErrorXml:
      description: Generic Matomo error payload in XML.
      properties:
        error:
          properties:
            message:
              type: string
              xml:
                attribute: true
              example: There was an error
          type: object
          xml:
            name: error
      type: object
      xml:
        name: result
    Error:
      description: Generic Matomo error payload.
      required:
      - result
      - message
      properties:
        result:
          type: string
          example: error
        message:
          type: string
          example: There was an error
        code:
          type: integer
      type: object
      additionalProperties: true
  parameters:
    formatOptional:
      name: format
      in: query
      description: Response format. Defaults to `xml`. Use `original` to get the original PHP data structure.
      required: false
      schema:
        type: string
        default: xml
        enum:
        - xml
        - json
        - csv
        - tsv
        - html
        - rss
        - original
  securitySchemes:
    MatomoToken:
      type: http
      description: Paste your token generated from Personal > Security. Swagger will send it as a Bearer token.
      scheme: bearer
externalDocs:
  description: Matomo Reporting API developer page
  url: https://developer.matomo.org/api-reference/reporting-api/