The charge or pricing value, necessary to complete a transaction or execute a contract on the Ethereum blockchain is referred to as gas. It is used to distribute resources of the Ethereum virtual machine so that decentralized applications such as smart contracts may self-execute in a safe but decentralized manner. It is priced in tiny fractions of the ether cryptocurrency, usually referred to as gwei. Having a different unit, for this reason, allows for a clear difference between the cryptocurrency's (Ethereum) actual worth and the computational cost of utilizing Ethereum's virtual machine.

These fees are designed to reward Ethereum miners for the time and energy it takes to validate a transaction, as well as to provide a layer of security to the Ethereum network by making it prohibitively expensive for bad users to spam it. Supply and demand between network miners, who can refuse to execute a transaction if the gas price falls below their threshold, and network users searching for processing capacity govern the real price. Gas costs are established by miners depending on supply and demand for the network's processing capacity, which is required to perform smart contracts and other transactions.

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