Kromatika DEX requires a fixed fee to operate. This fixed fee is the gas cost of the trade processor (Chainlink Keepers) and it is dependent on the current gas fee. Optionally, users can also choose to specify the gas price at which they want their trades to be executed. This may delay the trade execution, but it is an added option for lowering this fixed service fee. The user always pays this fixed fee in the form of $KROM tokens.