The maximum allowable change of futures price in one day is 5%, which is the theoretical price. If you calculate according to the leverage of 1: 10, then you should have at least 50,000 spare funds to ensure that the position on that day will never explode. But in fact, the biggest change in a day is only 1%-2%, so generally speaking, it is enough to leave more than 20 thousand points. Generally speaking, in the case of zero loss of reserve funds, the futures company will inform you to replenish funds.