Peaks rounds up each of your purchases to the next euro and invests the difference in your portfolio. You can also choose to make a one-time deposit or a fixed amount every month.
There are four different portfolios to choose from, depending on how risk-averse you are and what return you want to achieve. In addition, you can choose a term between 5 and 20 years for your personal portfolio.
The money is distributed to index funds and is held in safekeeping by an asset management company. So you have access to it at any time and get the full amount back if Peaks goes bankrupt.