Keep these points in mind about Gas fees:
1) Gas that has already been used is generally not refunded if a transaction fails, since validators did execute it.
2) A transaction fee is roughly equal to the amount of Gas used × the Gas price. Gas prices are usually expressed in Gwei.
3) Before confirming, check the estimated fee shown by your wallet. If it’s unusually high, don’t rush to confirm.
$ETH is the native coin used to pay Gas on the Ethereum mainnet.

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