The detailed answer is a bit longer : to Mint NFTs you will need to pay gas to the blockchain, that can be about 0 $ on some blockchain (like Ploygon), but can be very expensive on others, more than 50 $ (on Ethereum blockchain). No fees are required to Mint by Kredeum smartcontrat, but that may evolve in the future depending on Kredeum NFTs business model (but only apply on future Collections, not retro-active)
In next version with "presonalized collection" a fee will be needed to create your own NFTs Collection. Then the fees needed for Minting, or Exchanging NFTs of this collection, will be your choice, a mimimum Kredeum fee could be included (like OpenSea does).