Fees (Krystal Swap)
For every transaction that is processed on the blockchain, you will need to use some of the native tokens for gas fees.
Here are the native tokens, depending on which network you are swapping on:
As such, it will be good to have a small balance of these native tokens in your Krystal Wallet to process any swap transactions that you make.
If you do not have the appropriate token to process transactions on that particular network, you can consider receiving some tokens from a crypto faucet.