To receive rewards, there are minimum balances for each Account (check in the "Rewards and fees" section,
here). These minimum balances are independent, meaning rewards can be received for Bitcoin if you have a balance greater than the minimum, even if you don't reach the minimum in another Account.
Regarding the calculation of rewards, a daily comparison is made between the balance at 00:00 of each Account, with the balance of the previous day at 00:00, taking as the basis for the calculation the balance of the day that is lower. Let's see an example:
- Euro balance, day 1 at 00:00: 2500 EUR.
- Euro balance, day 2 at 00:00: 1400 EUR.
In this case, since the balance on day 2 is lower than that of day 1 (1400 EUR vs 2500 EUR), rewards will be calculated based on this.
The APR to be paid in each Account can be found in the "Rewards and fees" section
here.