Gas fees are the payments you make to a blockchain network to process a transaction, such as minting, buying, or transferring an NFT. On Ethereum, every action that changes data on the chain, like recording a new NFT owner, requires computing power from the network, and gas is the fee that compensates for that work. Since the London upgrade in August 2021, the fee splits into two parts: a base fee set automatically by the network and burned permanently, and an optional priority fee, or tip, paid to the validator who includes your transaction. Fees are not fixed. They rise when many people try to transact at once, such as during a popular NFT mint, and fall when network demand is low. You can lower what you pay by transacting during quieter hours, adjusting your wallet’s gas settings, or using a layer-2 network like Polygon, Arbitrum, or Base, where the same action often costs a small fraction of the Ethereum mainnet price.
If you have ever gone to mint or buy an NFT and seen a second charge on top of the listed price, that charge was gas. It is not a markup from the marketplace or the creator. It is the toll the underlying blockchain charges for processing your transaction, and it exists independently of whatever you are buying.
What gas fees actually pay for
Every blockchain that supports NFTs, Ethereum, Polygon, Solana, and others, needs a way to pay the computers (validators or miners) that verify transactions and keep the network running. Gas is that payment. When you mint an NFT, transfer one to another wallet, or accept an offer, you are asking thousands of independent computers to agree that the change happened and record it permanently. That work has a real cost, and gas is how the network recovers it.
The amount of gas a transaction uses depends on how complex it is. A simple ETH transfer uses a fixed, small amount of gas. Minting an NFT, which writes new data to a smart contract, typically uses more. Buying on a marketplace that involves an approval step first, then the purchase itself, can require two separate transactions, each with its own gas cost.
How Ethereum’s fee structure actually works
Gas pricing changed significantly with EIP-1559, which activated during Ethereum’s London upgrade on August 5, 2021 (eips.ethereum.org). Before that, users guessed a gas price in a blind auction, often overpaying or getting stuck when they guessed too low.
Base fee and priority fee
Under EIP-1559, every block has a base fee set automatically by the protocol, based on how full the previous block was. If blocks are consistently more than half full, the base fee rises by up to 12.5 percent per block. If they are under target, it falls by the same margin. Critically, the base fee is burned, meaning it is removed from circulation rather than paid to anyone.
On top of the base fee, you can add a priority fee, sometimes called a tip, which goes directly to the validator that includes your transaction in a block. During normal conditions this tip can be small, often just a gwei or two. During a high-demand NFT mint, raising your tip is how you compete for a spot in the next block ahead of other buyers.
Your wallet typically shows this as a total estimated gas cost, calculated as (base fee + priority fee) multiplied by the gas used. If you set a maximum fee higher than what is actually charged, the difference is refunded, not kept by the network.
A common myth: did the Merge lower gas fees?
A persistent misconception is that Ethereum’s switch to proof-of-stake, known as the Merge, in September 2022 was supposed to make transactions cheaper. It did not, and the Ethereum Foundation said as much before the upgrade shipped (Decrypt). The Merge changed how the network reaches consensus on new blocks and cut Ethereum’s energy use dramatically, but it did not change how much transaction capacity (block space) the network can process. Gas fees are a function of how many people are competing for that limited block space at a given moment, not the consensus mechanism underneath it. If you are budgeting for a mint, treat “the network got more efficient” claims with skepticism unless they specifically address block space, not energy use or security.
Why fees spike during NFT drops
Gas fees are demand-driven, which is why a popular mint can send fees far above normal levels for a short window. If a collection opens minting to everyone at once and thousands of wallets submit transactions in the same few minutes, they are all bidding for a limited number of transaction slots in each block. Priority fees climb as buyers try to outbid each other for inclusion, and the base fee itself rises block by block as the network stays congested. Once the initial rush passes, fees typically fall back to baseline within minutes to hours.
This is also why some collections stagger their mint (allow-list windows, timed phases) rather than opening to everyone simultaneously: it spreads demand over a longer period and keeps fees more predictable for buyers. If you’re choosing which chain to buy NFTs on, how a project handles its mint structure is worth checking before the drop, not after you’ve already paid a spike price.
How to pay less in gas fees
A few practical habits make a real difference over time. Several free gas trackers show current base fees in near real time, so checking before you transact and waiting a few hours, or until a weekend, when fees are elevated often helps if the transaction isn’t urgent. It also helps to set a reasonable priority fee instead of accepting your wallet’s default suggestion blindly; for a non-competitive transaction, a minimal tip is usually enough.
Using a layer-2 network where the marketplace or collection supports it makes the biggest difference. Rollup networks like Polygon, Arbitrum, and Base batch many transactions together and post a single compressed summary back to Ethereum, which is what lets per-transaction costs drop to a small fraction of mainnet pricing (ethereum.org). Many marketplaces now let you mint or trade on these networks directly from the same account you’d use on MetaMask.
Batching actions when a marketplace allows it also cuts costs: some platforms let you list, buy, or accept multiple offers in a single transaction rather than paying gas for each one separately. And it’s worth avoiding repeated approvals, since each time you approve a new contract to access your NFTs or tokens, that’s a separate gas-paying transaction. Reviewing what you actually need to approve avoids paying for permissions you won’t use.
None of this makes gas fees disappear. It is a real cost of using a public blockchain, and treating it as part of your budget, the same way you’d budget for a marketplace fee, avoids surprises when you go to mint an NFT or make a purchase.
The bottom line
Gas fees exist because blockchains need a way to pay for the computing work that makes decentralized record-keeping possible. On Ethereum, the fee you pay splits into a burned base fee set by network conditions and an optional tip that speeds up inclusion, a structure in place since the 2021 London upgrade. Fees rise and fall with demand, not with any single upgrade or announcement, and layer-2 networks remain the most reliable way to cut costs for routine NFT activity. Understanding the mechanism, rather than treating gas as a random tax, makes it much easier to plan around it.
Leave a Reply