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

# BBO (RPI)

### Topic: bborpi@`{symbol}`

Push interval: 10ms\
Subscribe to the BBO of the book with both non-RPI and RPI orders.

<RequestExample>
  ```bash Subscribed messages theme={null}
  {
    "id": .....
    "cmd": "SUBSCRIBE",
    "params": ["bborpi@SPOT_BTC_USDT"]
  }
  ```
</RequestExample>

<ResponseExample>
  ```bash theme={null}
  {
      "topic": "bborpi@SPOT_BTC_USDT",
      "ts": 1618820361552,
      "data": {
          "s": "SPOT_BTC_USDT",    // symbol
          "ap": "42598.2",         // best ask price
          "aq": "1.05",            // best ask quantity
          "bp": "42598.1",         // best bid price
          "bq": "2.01"             // best bid quantity
          "ts": 1618820361540      // bbo generation time in engine
      }
  }
  ```
</ResponseExample>