Transactions on most blockchain networks incur a fee, commonly referred to as "Gas". This fee rewards the activity of the different nodes in the network for confirming your transaction.
Transactions using an Ethereum network wallet (like MetaMask or Portis) may incur Gas charges.
Transactions using the application's default Kred Wallet (on the Stellar blockchain network) do not incur any Gas charges.
Whenever a Gas fee is charged, it is displayed in the application, so there are no surprises!