At Bitstack, our system calculates round-up throughout the week and makes a weekly deduction on Sunday evening for the total of the previous week's round-up. This method of saving works well with debit cards, which give us visibility of your transactions, whereas credit cards do not.

It is likely that your bank does not communicate your transactions to us until the end of the month, when they are debited from your bank account. This explains why you cannot see them immediately on our application.

It is important to note that Bitstack calculates rounding on all transactions associated with your bank accounts linked to the application, including direct debits and transfers. This means that some of your bank transactions may still be taken into account when calculating weekly rounding.

If this doesn't work for you, you can also schedule a recurring purchase (weekly or monthly) by credit card by clicking on Recurring in the Wallet tab so that you can save in Bitcoin automatically.