What is EIP-1559 and how did it change gas fees?
EIP-1559, implemented in August 2021 as part of Ethereum's London hard fork, fundamentally changed how gas fees work by replacing the first-price auction system with a base fee that burns and an optional priority tip. The result was more predictable transaction costs, though it did not make Ethereum cheaper overall.
The problem EIP-1559 solved
Before EIP-1559, Ethereum used a simple auction model. You submitted a transaction with a gas price you chose. Miners picked the highest-paying transactions first. This created two problems:
- Uncertainty: You could not know what gas price would get your transaction included in the next block. You might overpay or wait hours.
- Network congestion chaos: During popular NFT mints or DeFi launches, users would bid ever-higher prices, creating a panic spiral. Gas prices could spike to several hundred gwei.
The system also gave all the fee to miners. Ethereum had no mechanism to reduce the circulating supply of ETH.
How EIP-1559 Works
EIP-1559 introduced a two-part fee structure:
Base Fee
The base fee is the minimum amount you must pay per unit of gas for your transaction to be valid. It is algorithmically determined by how full the previous block was. The network targets 50% block utilization (15 million gas per block pre-Merge, 30 million after).
- If a block is more than 50% full, the base fee increases by up to 12.5%.
- If a block is less than 50% full, the base fee decreases by up to 12.5%.
The base fee adjusts up or down per block, making it predictable within a few blocks. You can calculate the next base fee accurately. The base fee is burned - permanently removed from circulation.
Priority Fee (Tip)
The priority fee is an optional amount you add on top of the base fee. This goes to validators (formerly miners) as an incentive to include your transaction. During normal network conditions, a tip of 1-2 gwei is usually enough. During congestion, you might need to tip more to jump the queue.
Max Fee
Your wallet asks you to set a "max fee" (sometimes shown as "max base fee" in advanced settings). This is the absolute highest total fee you are willing to pay. If the actual base fee plus your tip is lower, you pay only the actual amount. The difference is refunded.
What changed for users
Before EIP-1559: You set a gas price. If it was too low, your transaction sat pending. If too high, you overpaid. You had to guess or use third-party estimators.
After EIP-1559: Most wallets (MetaMask, Rabby, others) automatically estimate the current base fee and suggest a small tip. You can usually accept the default and know your transaction will clear within a couple of blocks. Overpayment is far less common.
The fee burning also means that when Ethereum is busy, ETH supply shrinks. This was intended to make ETH deflationary during high usage, though it has not consistently achieved that.
What did not change
- Total cost: EIP-1559 did not make transactions cheaper. It made them more predictable. During congestion, the base fee can still spike to hundreds of gwei. You still pay for each unit of gas your transaction uses.
- Gas limits: You still set a gas limit for each transaction. Complex operations (like swapping tokens) still require more gas than simple ETH transfers.
- Underpriced transactions: If you set a max fee too low (below the current base fee), your transaction will fail or remain pending. The same troubleshooting techniques apply: speed up, cancel, or wait for the base fee to drop.
- Wallet compatibility: EIP-1559 is backward compatible. Older wallets that do not support the new fee format can still send transactions, though they may overpay by including the base fee in their tip.
Practical Implications
For Regular Transfers
The user experience improved. You send ETH, your wallet proposes a fee, you confirm. The transaction usually goes through in the next block or two. You rarely need to adjust settings manually.
During Network Congestion
When demand spikes (e.g., a popular NFT mint), the base fee rises block by block. You can still overpay by setting too high a tip, but the base fee adjusts predictably. Many users set a max fee slightly above the current base fee and wait for it to drop if the network cools.
For defi power users
You can still use the legacy fee format if your wallet supports it, but EIP-1559 gives you better tools. You can set a low tip and a high max fee, ensuring your transaction eventually goes through without overpaying during brief spikes.
For stakers and validators
Validators still earn priority tips. They also earn the block reward (newly issued ETH). The base fee burn reduces overall ETH supply, which can affect staking yields indirectly.
Summary
EIP-1559 replaced the blind auction with a predictable base fee that burns and a small tip for validators. It made gas fees more predictable and reduced overpayment, but did not lower costs. The system adjusts automatically based on network demand, and you can estimate your fee accurately within a few blocks. If you use a modern wallet, you rarely need to think about it - just confirm the suggested fee.
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