Gas Fees
The transaction fees paid to process and validate operations on a blockchain network, compensating validators or miners for the computational resources required.
Gas fees are the transaction costs required to execute operations on a blockchain — whether a simple ETH transfer, a DeFi swap, or a complex smart contract interaction. On Ethereum, gas fees are denominated in gwei (one billionth of an ETH) and calculated as: Gas Used (computational complexity of the transaction) × Gas Price (how much you're willing to pay per unit of gas). During periods of high network congestion, gas fees spike dramatically — a swap that costs $3 at low demand could cost $50-100 during peak activity. Ethereum's transition to Proof of Stake (2022) reduced energy consumption but did not directly lower gas fees. The solution came through Layer 2 networks: as of 2026, Arbitrum, Base, and Optimism process transactions at $0.005-0.02 — often thousands of times cheaper than mainnet. Gas fees serve three purposes: (1) compensating validators for securing the network, (2) preventing spam transactions through economic cost, and (3) through Ethereum's EIP-1559 mechanism, burning a portion of fees which creates deflationary pressure on ETH supply during high activity. Understanding gas fees is essential for using Ethereum cost-effectively in 2026 — always check L2 options before transacting on mainnet.