Interest is calculated daily and added to your available cash at the start of each month. The interest income on Mintos Smart Cash depends on the performance of the underlying money market fund. The return fluctuates daily. The interest rate earned represents the interest you’d earn if you held the investment for a year and the yield achieved by the fund didn’t change.
Here’s an example for calculating daily interest assuming a €1000 investment at a 3.7% interest rate:
€1000 x 3.7% / 365 = €0.10 per day