Fees
When interacting with smart contracts on ZetaChain, a user includes a portion of value that is spent on gas for that transaction.
Smart contract deployments and smart contract calls require gas to run. A user
can call a zEVM contract from an external chain by ZRC-20 deposit, including a
contract call in the message, or connecting directly to ZetaChain and
interacting with a contract that with a contract already deployed on zEVM.
The gas market/mechanism for ZetaEVM smart contracts is based on that of Ethermint and behaves similarly to EIP 1559 Ethereum gas fees. This gas system is built to deter malicious users from spamming the network.
Omnichain Contract Fees
Deposit
When depositing tokens to ZetaChain by sending them to the TSS address on a connected chain, you pay the same fee as you would for a normal transaction on that chain in a native gas token.
For example, if you deposit ETH to ZetaChain from Ethereum, you pay the same fee as you would for a normal token transfer transaction on Ethereum in ETH. Refer to the following docs for more information on gas and fees on Ethereum.
Withdraw
When withdrawing ZRC-20 tokens from ZetaChain to a connected chain, you pay the "withdraw gas fee".
To get the fee, you can call the withdrawGasFee function on the
ZRC-20 contract
of the token you want to withdraw. This function returns the fee in the native
gas token of the connected chain.
The withdraw function deducts the withdraw gas fee from the caller's ZRC-20
balance and withdraws the amount to the destination chain.