There is no fee charged by Metal Pay for depositing cryptocurrencies.
When withdrawing crypto, the transaction will incur a network fee. The fee is charged by the blockchain network used to send the transaction, these funds are sent to the miners of the respective blockchain networks. When reviewing the withdrawal order, you will see the amount you've requested, the amount that's being deducted from the fees and the total amount — all quoted the in cryptocurrency you are withdrawing.
The transaction fee is dynamic, refreshed every 2 minutes and will be calculated using the average speed at the time of the transaction.