Orderbook

{
    "method": "subscribe",
    "params": {
        "source": "book",
        "symbol": "SOL",
        "agg_level": 1  // Aggregation level
    }
}

{
  "channel": "book",
  "data": {
    "l": [
      [
        {
          "a": "37.86",
          "n": 4,
          "p": "157.47"
        },
        // ... other aggegated bid levels
      ],
      [
        {
          "a": "12.7",
          "n": 2,
          "p": "157.49"
        },
        {
          "a": "44.45",
          "n": 3,
          "p": "157.5"
        },
        // ... other aggregated ask levels
      ]
    ],
    "s": "SOL",
    "t": 1749051881187,
    "li": 1559885104
  }
}