Prices on the cryptomarkets are always changing, to protect users from unexpected losses and high price changing - we implemented a Market Order in Atomic Wallet. Now the orders rate is updated every 5 minutes. It also allows users to choose margin in which they are willing to exchange their funds. It applies to all the assets, including our Cardano Wallet.

The data is requested automatically from Your order will always be traded at an up-to-date price. Also you can set the margin to speed up the order execution or to get a better price: this data will be added or subtracted from the Coinmarketcap rate.
If you have any additional questions regarding functionality of the wallet, you can always write to our Support Centre. You will always receive a reply within 24 hours.