The yobit exchange has a great feature whereby you are able to invest your coins in their exchange and they will provide you with a good interest rate. These interest rates can even go as high as 10% daily interest, with the option of taking out your investment at any point. However, when you are using this feature, there is something that you should be aware of and this is from personal experience. You should be very careful which coins you invest in and for how long. If you look at the coins with higher interest rates, this is generally the coins that have more risk and decline in price faster, however lower interest rates are for more stable and well known coins. Therefore you have to be careful when investing.