When trading at Darkex, you will see that you have 2 different options on your orders. These options are Market and Limit Orders.
Market Orders
Market Orders are meant to be executed as quickly as possible. This means that Market Orders execute a trade immediately at the best available price. This may provide the fastests order, however the exact price may fluctuate.
Limit Orders
Limit Orders trigger your order at the exact price you set. You can fine tune at which exact price you would like to buy or sell and the moment price reaches or lowers to Limit Order, your order will be executed. However, if the price never reaches the set price, this order will never trigger.