quoteOrderQty and cummulativeQuoteQty issue

API Spot/Margin API
1

It is a market order i have enough BNB.
Here’s market order info:

symbol: BIFIBNB
quoteOrderQty: 0.285
side: ‘BUY’
type: ‘MARKET’

Here’s result info:
{
“symbol”: “BIFIBNB”,
“orderId”: 9918151,
“orderListId”: -1,
“clientOrderId”: “x-U5D79M5BJcZqaAQqTazoTL1aElXO”,
“transactTime”: 1623984964445,
“price”: “0.00000000”,
“origQty”: “0.05200000”,
“executedQty”: “0.05200000”,
“cummulativeQuoteQty”: “0.28314000”,
“status”: “FILLED”,
“timeInForce”: “GTC”,
“type”: “MARKET”,
“side”: “BUY”,
“fills”: [
{
“price”: “5.44500000”,
“qty”: “0.05200000”,
“commission”: “0.00019686”,
“commissionAsset”: “BNB”,
“tradeId”: 457400
}
]
}
Not sure why cummulativeQuoteQty(0.28314000) is less than quoteOrderQty(0.285) even there’s enough BNB coin.(I thought cummulativeQuoteQty value should be the same as 0.285)
Please give me a hint on how to consider it.
Kind regards.

2

when placing a market order with quoteOrderQty, the system is trying to fill as much as possible, but it’s not guaranteed to be fully filled.

3

Thanks for your answer.
Is there any way to predict the cummulativeQuoteQty value is equals to quoteOrderQty or not?