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

# List categories

> Returns categories filtered by parentId. Omit parentId for top-level categories.



## OpenAPI

````yaml /openapi/openapi.json get /categories
openapi: 3.0.2
info:
  title: AGG API
  version: 1.0.0
  description: >-
    Prediction market aggregator REST API — authentication, users, venue events,
    venue markets, orderbooks, charts, and execution workflows.
servers:
  - url: https://api.agg.market
    description: Production
  - url: https://api.staging.agg.market
    description: Staging
security: []
paths:
  /categories:
    get:
      tags:
        - Discovery
      summary: List categories
      description: >-
        Returns categories filtered by parentId. Omit parentId for top-level
        categories.
      operationId: getCategories
      parameters:
        - name: parentId
          in: query
          required: false
          schema:
            type: string
        - name: limit
          in: query
          required: false
          schema:
            minimum: 1
            maximum: 100
            type: number
        - name: cursor
          in: query
          required: false
          schema:
            type: string
      responses:
        '200':
          description: '200'
          content:
            application/json:
              schema:
                type: object
                required:
                  - data
                  - nextCursor
                  - hasMore
                properties:
                  data:
                    type: array
                    items:
                      type: object
                      required:
                        - id
                        - name
                        - displayName
                        - parentId
                        - eventCount
                        - volume24hr
                        - volume
                      properties:
                        id:
                          type: string
                        name:
                          type: string
                        displayName:
                          type: string
                          nullable: true
                        parentId:
                          type: string
                          nullable: true
                        eventCount:
                          type: number
                        volume24hr:
                          type: number
                        volume:
                          type: number
                  nextCursor:
                    type: string
                    nullable: true
                  hasMore:
                    type: boolean
        '401':
          description: '401'
          content:
            application/json:
              schema:
                type: object
                required:
                  - message
                properties:
                  message:
                    type: string
        '403':
          description: '403'
          content:
            application/json:
              schema:
                type: object
                required:
                  - message
                properties:
                  message:
                    type: string
      security:
        - appId: []
components:
  securitySchemes:
    appId:
      type: apiKey
      in: header
      name: x-app-id
      description: Your application ID. Required for all app-tier and user-tier routes.

````