TL;DR: Gas is the fee you pay to get a crypto transaction processed on a blockchain.
Last updated: May 2026
Gas is the cost of using a blockchain, paid to the network for execution and security. If you swap tokens, bridge funds, mint an NFT, approve a token, or send ETH to a friend, your wallet will show a gas estimate before you confirm. That fee is not a random app charge. It is the price of asking the chain to include your transaction and run the computation behind it.
Who gets paid now?
Older Ethereum guides talk about “miners,” but Ethereum has not used miners since the Merge in 2022. Today, Ethereum is secured by validators. Validators propose and attest to blocks, and users compete for blockspace by paying transaction fees. The same habit of saying “gas” stuck around, but the people operating the chain changed.
This matters because gas is no longer a mining reward in the old proof-of-work sense. On Ethereum mainnet, part of every fee is burned, and part goes to the validator as a tip. That design came from EIP-1559 and is still the basic fee model beginners see in wallets today.
Base fee, priority tip, and total cost
Most Ethereum transactions have two pieces: a base fee and a priority fee. The base fee is set by the network depending on demand. When blocks are crowded, the base fee rises. When activity cools down, it falls. The priority fee, often called the tip, is the extra amount you offer to make your transaction more attractive to validators.
Your wallet usually hides the math and shows a total estimate. For example, on a quiet 2026 mainnet day, you might see a transaction priced around a ~3 gwei base fee plus a small priority tip. If the transaction is simple, that can be reasonable. If you are doing a complex DeFi action on Ethereum mainnet during a rush, it can still sting.
Why gas feels cheaper on L2s and HyperEVM
Gas-fee anxiety is mostly a mainnet ETH problem now. Layer 2 networks like Base, Arbitrum, Optimism, and others batch activity and settle back to Ethereum, so normal swaps and transfers often cost cents instead of dollars. You still pay gas, but it barely registers compared with old mainnet DeFi.
HyperEVM is even more direct for Hyperliquid users. It uses HYPE as the native gas token, not ETH, and everyday transactions are usually far cheaper than Ethereum mainnet. A HyperEVM swap can settle for fractions of a cent, which changes user behavior: you can test a small transaction, move around an app, or fix a mistake without feeling like each click needs a committee meeting.
What to check before you confirm
Do not approve transactions blindly just because the gas looks cheap. Gas only tells you the network fee. It does not tell you whether the contract is safe, whether the token is real, or whether the site is trying to drain your wallet. A good wallet like Rabby helps by showing the network, token movements, approvals, and estimated gas before you sign.
For beginners, the practical rule is simple: keep enough native token for gas on the network you are using. ETH pays gas on Ethereum mainnet and many ETH-based L2s. HYPE pays gas on HyperEVM. If your transaction fails because you have “insufficient gas,” you probably need a tiny amount of the chain’s native token in that wallet.