Gas Fee Optimizer

Gas is Ethereum unit of computational metering. Every opcode carries a fixed gas charge, a plain value transfer costs an intrinsic 21,000 units, and more elaborate operations cost more because they touch more state: roughly 46,000 for a token approval, about 65,000 for an ERC-20 transfer, 100,000 to 200,000 for a decentralised exchange swap, and from several hundred thousand upward for a contract deployment. Since the London upgrade the price side has two parts. A base fee is set by the protocol itself and destroyed rather than paid to anyone, and a priority fee is added by the user as a tip to the block proposer. Total cost is those two added together, multiplied by gas actually consumed, divided by 10^9 to reach ETH. The base fee is what makes fees predictable. Blocks target half of their maximum gas, and the base fee can move by at most 12.5 percent from one block to the next, so congestion raises prices along a bounded exponential curve instead of an unbounded bidding war. Two details matter when reading an estimate. Gas limit is a ceiling, not a charge: unused gas is refunded, so the figure shown is an upper bound for anything except a simple transfer, where consumption is exact. And the maximum fee a wallet sets is not what is paid; the user pays the prevailing base fee plus the tip and gets the difference back. Layer 2 costs follow a different structure, dominated by the cost of publishing data back to Ethereum rather than by local execution.

Gas was part of Ethereum design from the beginning, specified in the 2014 Yellow Paper written by Gavin Wood. Its original purpose was not price discovery but termination: because the virtual machine is Turing complete, charging for each step is what guarantees that a program cannot loop forever at the network expense. The schedule of per-opcode prices was revised under pressure in October 2016, when a denial-of-service campaign exploited operations whose gas cost was far below their real execution cost, prompting the Tangerine Whistle repricing. Fee pricing was a simple first-price auction for the first six years, and it worked badly. Users had no reliable way to know the clearing price, wallets routinely overbid, and fees spiked violently during popular token sales and NFT mints. EIP-1559, authored by Vitalik Buterin, Eric Conner, Rick Dudley, Matthew Slipper, Ian Norden and Abdelhamid Bakhta and first published in 2019, replaced that auction with the algorithmic base fee plus tip model, and was activated in the London hard fork on 5 August 2021. Burning the base fee also made ETH issuance partly deflationary, an economic consequence secondary to the original usability goal. The next major shift came with EIP-4844 in the Dencun upgrade of March 2024, which gave rollups a dedicated blob data channel and cut typical Layer 2 transaction costs by an order of magnitude or more.