Gas fees is a commonly used term for the cost that certain blockchain protocol users pay to network validators each time they wish to perform a function on the blockchain. Gas serves as an incentive for network validators to record transactions accurately and behave honestly in the upkeep of the protocol. fee is the term given to transaction fees on the Ethereum blockchain network. “Gas” is the name for a special unit used in Ethereum. It measures how much “work” an action or set of actions takes to perform.