> ## 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.

# Best Bid/Offer

> Top-of-book best bid/offer for one instrument.

Lighter than fetching the full [book](/perps/market-data/book) when you only need the touch. Streams as [`perps_bbo:<instrument>`](/perps/websocket/channels).


## OpenAPI

````yaml GET /v3/perps/bbo/{instrument}
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/bbo/{instrument}:
    get:
      tags:
        - Perps
      summary: Best bid/offer
      description: Top-of-book best bid/offer for one instrument.
      operationId: perps_bbo
      parameters:
        - name: instrument
          in: path
          required: true
          description: Instrument id (e.g. `6`), symbol (`BTC-USD`), or bare asset (`btc`).
          schema:
            type: string
      responses:
        '200':
          description: Success
          content:
            application/json:
              example:
                ask_price: '62739'
                ask_quantity: '0.00481'
                bid_price: '62738'
                bid_quantity: '0.02391'
                instrument_id: 6
                symbol: BTC-USD
                timestamp: 1783598395058
components:
  securitySchemes:
    api_key:
      type: apiKey
      in: header
      name: x-api-key

````