MarketDepth

{
    "totalBuyQty": 0,
    "totalSellQty": 0,
    "buy": [
        {
            "price": 0,
            "quantity": 0,
            "count": 0
        }
    ],
    "sell": [
        {
            "price": 0,
            "quantity": 0,
            "count": 0
        }
    ]
}