Explainer · Network fees
Gas fees, explained
October 13, 2026
"Gas" is the price of getting a computer network to do something on a blockchain's behalf — and unlike most prices, it moves by the minute, set at auction rather than posted on a menu. Here is what a gas fee is actually paying for, why it spikes when it does, and why checking one before a transaction is ordinary due diligence rather than something only a power user would bother with.
What a gas fee is actually paying for
Every action on a blockchain — sending a token, swapping on a decentralized exchange, minting an NFT — requires computation and storage on a network of computers, and none of that is free to provide. A gas fee is the payment for that work, collected by whoever actually processes the transaction: miners on a proof-of-work chain, validators on a proof-of-stake chain like Ethereum today. The name comes from the idea of fuel — every operation a transaction performs costs a certain amount of "gas," and more complex transactions burn more of it.
That is the first thing worth separating from the price of the coin itself. A gas fee is not a cut of the asset being moved; it is a toll for the network's time, and it is charged whether the transaction is moving $10 or $10 million.
Why fees spike: it's an auction, not a price tag
A block has a fixed amount of space, and only so many transactions fit in it. When more people want in than there's room for, they are effectively bidding against each other for a spot — the auction dynamic is the entire reason fees move at all. During a popular NFT mint or a sudden rush of trading activity, that competition can push fees many times higher than an ordinary Tuesday, then back down once the surge passes. Nothing about the network changed; the number of people trying to use it at that exact moment did.
This is also why a simple transfer and a complex smart-contract interaction cost such different amounts. Sending a token from one wallet to another is a small, well-defined bit of computation. A decentralized-exchange swap has to check prices, move funds through a liquidity pool, and update multiple balances in a single transaction — more steps, more gas, at a given moment of network demand, even though the second one only feels like "a click" to the person doing it.
How the fee itself is priced
- Base fee. Ethereum and similar chains now set a base fee algorithmically, block by block, moving up or down with recent demand under a mechanism generally known by its Ethereum proposal number, EIP-1559. That base fee is burned outright — it isn't paid to the validator at all, which is a deliberate design choice to make the fee track real demand rather than being set unilaterally by whoever processes the block.
- Priority fee (the tip). On top of the base fee, a sender can add a small tip to the validator, as an incentive to include their transaction sooner rather than later in a congested block. A higher tip generally means faster inclusion; it's optional, but skipping it during a busy period can mean waiting considerably longer.
Why some chains are so much cheaper
The base chain's fee auction is a direct consequence of doing all of its own verification, transaction by transaction, with a fixed amount of block space to sell. Layer 2 networks sidestep that constraint by batching many transactions together off the base chain and settling a single compressed summary back to it — spreading one "slot" in the auction across hundreds or thousands of users instead of one. Blockchain IQ's explainer on Layer 2s covers how that batching actually works and what a user is trusting to get the lower fee; it's the direct answer to "why is this other network so much cheaper."
The read
A gas fee is not a fixed cost of using a blockchain — it's a live readout of how much everyone else wants the same block space right now. That means it is also information: a fee estimator or wallet's gas display, checked before hitting confirm, tells a user whether they're paying an ordinary toll or a surge price for something that could just as easily wait ten minutes. Treating that check as routine, not paranoid, is the entire difference between predictable costs and an unpleasant surprise.
This is general-circulation educational content, not investment or legal advice. Gas mechanics vary by network and change over time as chains upgrade their fee markets; nothing here is a recommendation to transact on any specific network.
For how Layer 2 networks bring fees down through batching, see Blockchain IQ's explainer Layer 2s, Explained.