The Kusama transaction fees consist of the current fee-per-byte multiplied by the transaction’s network fee, plus an optional tip. You can change the tip amount according to the transaction’s priority level or enter a custom amount. When you set a tip amount, Fireblocks automatically calculates the total transaction fee by adding the tip amount and network fee together. However, only the tip amount is shown in the Console.
Note that when using the Fireblocks API, the Estimate the required fee for an asset endpoint only returns the network fee. To send a fee via the API, you need to calculate the network fee and add the tip. The sum is then sent in the transaction API request as the total fee.