That is, someone takes you to make a single order and calls up the transaction order in real time, so that you can trade empty orders or multiple orders at the current price. This kind of transaction depends on the trading ability of the single person. If the person who calls the order is skilled, he calls the order and you make the order, which should generally be profitable. If you only call the order and don't tell you how to close the position, you may also lose money.