Ledgerama charges reasonable fees here and there for different activities on the Hedera network that you may be interested in, including staking configuration for an account, as an example. 

In Settings => USAGE FEES => Max Wallawallet Fee, you can specify the maximum value in USD of a Wallawallet fee that you are willing to pay. If a given activity in Wallawallet exceeds your specified maximum Wallawallet fee (for a fee paid to Ledgerama, creator of Wallawallet), you will be warned that the fee threshold you have set has been exceeded. If you are willing to pay a fee that is higher than you would normally to like for a service provided in Wallawallet, you can increase the value of the max fee in this screen, perform the activity and then lower the max fee again to help prevent yourself from accidentally paying more in fees to Ledgerama than you’d like.