Moonstake is a service that allows you to stake various currencies.
I use Moonstake to stake ATOM (COSMOS), and the API is quite expensive at 8%.
However, what I personally find most interesting about this ATOM is that you can earn interest every few seconds.
Depending on the amount of staking, if you are staking a certain amount, you will be rewarded a little bit every few seconds.
Of course, the more you stake, the more you will be paid every few seconds. This makes it possible to compound interest more efficiently.
If you are interested, please give it a try.