This is a cost that you have to pay directly with the native token on the Source Chain you own when performing the Bridge function.
You generally need to pay for gas fee to perform a transaction in most blockchains. If the bridge function is performed once, the gas fee is paid through the native token for each chain as transactions are carried out both on the source chain and destination chain.
- Iskra Mainnet (Klaytn) : Klay
- Ethereum : Ether