Gas on Ethereum: what you pay for and why the fee jumps severalfold

Ethereum's fee scares newcomers with its unpredictability: a dollar yesterday, fifty today. The mechanics are actually transparent.

What the fee is made of

Fee = gas × gas price. Gas is a measure of computational work: an ETH transfer costs 21000 units, a DEX swap - hundreds of thousands (the contract does more operations). The gas price is an auction for block space: the base fee (burned, floats with load) plus the validator tip. Blockspace is limited - in a frenzy (a mint, a listing, a panic) the gas price jumps by orders of magnitude: everyone wants into the same block.

How to pay less

• Timing: network load is cyclical - weekends and "quiet" hours are consistently cheaper.
• L2s: the same actions on Arbitrum/Base cost cents - after blobs this is the main road for retail.
• Limits and slippage: a failed transaction burns gas too; in a frenzy, failed swaps are the main hidden cost.
• Aggregators route the swap more efficiently and save gas on complex paths.

And the key understanding: a high fee is not "network greed" but the market price of scarce blockspace. When gas is expensive - something is happening on the network; our live wire usually knows what.