Most exchangers have an option that protects customers from sudden market movements. When filling out an application for the purchase or sale of cryptocurrency, the rate at which the transaction will be executed is fixed for a specified period. Usually this period is 30 minutes: 15-20 minutes are given for the execution of the application and another 15 for the transfer.
This option can be used to buy or sell cryptocurrency during strong fluctuations much more profitable than the market rate. As an example, consider the fall in Bitcoin value that occurred on September 24, 2019.