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

# List Categories

> Top-level categories with market counts, volume, and liquidity

Top-level Polymarket categories ordered by activity, each with its market count, total and rolling volume, liquidity, and all-time trade count. Use this to build a top-level navigation surface before drilling into [tags](/api-reference/discovery/tags) or [events](/api-reference/markets/events).

<Note>Per-category open interest is not exposed — a category-wide OI sum is unreliable. Use `total_volume_usd`, the windowed `rolling_metrics`, and `liquidity_usd` for activity ranking.</Note>


## OpenAPI

````yaml GET /v2/polymarket/categories
openapi: 3.1.0
info:
  title: Predexon API
  description: Prediction market data aggregation and matching API
  version: 2.0.0
servers:
  - url: https://api.predexon.com
security:
  - apiKey: []
paths:
  /v2/polymarket/categories:
    get:
      tags:
        - polymarket
      summary: List Categories
      description: Top-level categories with market counts + active volume/OI, by activity.
      operationId: list_categories_v2_polymarket_categories_get
      responses:
        '200':
          description: Successful Response
          content:
            application/json:
              schema: {}
components:
  securitySchemes:
    apiKey:
      type: apiKey
      in: header
      name: x-api-key

````