为什么我会收到“余额不足！” KuCoin API 出错？

Question

我得到“余额不足！” KuCoin API 错误。 但我正在从 Kucoin api 获取我的帐户 USDT 余额并基于此创建订单。

# KuCoin
from kucoin.client import Trade, User

api_key = "xxxxxx"
api_secret = "xxxxxxx"
api_passphrase = "xxxxxxxx"

client = Trade(api_key, api_secret, api_passphrase, is_sandbox=False)
Userclient = User(api_key, api_secret, api_passphrase, is_sandbox=False)


def Get_USDT_Balance():
    account_list = Userclient.get_account_list()
    for i in account_list:
        if i["currency"] == "USDT" and i["type"] == "trade":
            balance = float(i["balance"])
            print(balance)
            balance = str(balance)
            balance = balance.split('.')
            balance = balance[0]+"."+balance[1][0]
            break
    print(balance)
    return balance

symbolCode = "BTC-USDT"
buy_order = client.create_market_order(symbolCode, 'buy', funds=Get_USDT_Balance())

我明白了：