Hello @christian
For coins like $ETH (+0,76 %)
$ADA (-0,11 %)
$AKT (+0,27 %)
$DOT (+1,2 %)
$AVAX (+1,38 %)
$MATIC (+0,8 %) and possible more.
An approximate "%" APR/APY with your monthly or weekly reward would be a very good implementation as these currencies are increasingly more popular + higher marketcap. (BTC and ETH adoption these days)
"Worst" case APR/APY can be configured by the own user.
It would be a feature that separates the application from the rest for the better, pretty clear.
If more feedback is needed I can help ofc.