This document is a summary of the current Ardor blockchain transaction fees. Fees are determined by the transaction type, but also depend on parameters such as attachment sizes and phasing options, and are therefore not a simple constant for each transaction type.
The minimum fees are denominated in ARDOR. On each child chain, fees are paid in the native token, and it is up to the bundlers to decide what exchange rate to use when accepting native tokens from transaction senders and paying ARDOR to the block forgers.
All transactions that directly modify Ardor chain balances must be stored on the Ardor chain, and their fees are payable in ARDOR only, there is no bundling process involved for those.