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

# Coverage

> Transparency metric: for each instrument, our tracked long/short open interest (from the latest position snapshots) vs the exchange's live reported OI.

A transparency metric. For every instrument it reports our tracked long/short open interest (from the latest position snapshots) against the exchange's live reported OI, so you can see exactly how complete our position capture is. On the majors it runs near 100%.


## OpenAPI

````yaml GET /v3/perps/coverage
openapi: 3.1.0
info:
  title: PolyNode API
  description: >-
    Real-time Polymarket data API with decoded mempool settlements, OHLCV
    candles, and full Polygon JSON-RPC proxy.
  contact:
    name: PolyNode
    url: https://polynode.dev
  license:
    name: ''
  version: 2.0.0
servers:
  - url: https://api.polynode.dev
    description: Production
security:
  - api_key: []
paths:
  /v3/perps/coverage:
    get:
      tags:
        - Perps
      summary: Coverage
      description: >-
        Transparency metric: for each instrument, our tracked long/short open
        interest (from the latest position snapshots) vs the exchange's live
        reported OI.
      parameters: []
      responses:
        '200':
          description: Success
          content:
            application/json:
              example:
                data:
                  - instrument_id: 6
                    symbol: BTC-USD
                    tracked_long_oi: '65.0'
                    tracked_short_oi: '65.2'
                    exchange_oi: '65.4'
                    coverage_pct: '99.4'
                    accounts: 142
components:
  securitySchemes:
    api_key:
      type: apiKey
      in: header
      name: x-api-key

````