Last updated: 21 July 2026
Gas fees on
Key Highlights
- EIP 1559, implemented on August 5, 2021, introduced a base fee burning mechanism for every transaction.
- Ethereum’s total burned ETH surpassed 4 million by Q4 2023, representing over $10 billion at prevailing market prices.
- Average gas prices peaked above 200 gwei during the May 2021 bull run and again during high demand events like the Otherside NFT mint in April 2022.
- Layer 2 solutions such as Arbitrum and Optimism consistently offer transaction fees 90% to 99% lower than Ethereum mainnet.
- The Merge, completed in September 2022, shifted Ethereum to Proof of Stake but did not directly reduce gas fees, instead laying groundwork for future scaling.
Ethereum gas fees are the cost paid to execute transactions or smart contract operations on the Ethereum blockchain, essential for compensating network validators and preventing spam. These fees are denominated in gwei, a small unit of Ether, and fluctuate significantly based on network demand, often spiking during periods of high activity like NFT mints or DeFi surges.
Understanding what are ethereum gas fees is crucial for anyone interacting with the network. Every action, from sending Ether to swapping tokens on Uniswap or minting an NFT, requires computational resources. Gas is the unit measuring this computational effort, and the gas price determines its cost. Without gas fees, the network would be vulnerable to malicious actors flooding it with endless, zero cost transactions, grinding it to a halt.
The system works somewhat like an auction, where users bid for their transactions to be included in the next block. Higher bids generally mean faster confirmation times. This dynamic creates a marketplace for block space, directly influencing how much users pay to use the network.
The Mechanics of Ethereum Gas: Gwei, Base, and Priority Fees
Before August 2021, Ethereum’s gas fee structure operated on a simple first price auction model. Users would submit a “gas price” they were willing to pay per unit of gas, and miners would prioritize transactions with the highest bids. This often led to overpaying, as users had little transparency into the optimal price.
The London Hard Fork, which introduced EIP 1559, fundamentally changed this. Now, each transaction has two primary components: a “base fee” and a “priority fee” (or tip). The base fee is automatically adjusted by the protocol based on network congestion, rising when the network is busy and falling when it is idle. This fee is burned, not paid to validators, making Ether deflationary over time.
The priority fee is an optional “tip” paid directly to the validator who includes your transaction in a block. Users can set this fee to incentivize validators to process their transaction faster, especially during periods of high demand. A higher priority fee can help ensure your transaction is processed ahead of others competing for the same block space.
Gas is measured in gwei, a denomination of Ether. One gwei equals 0.000000001 ETH (10^9 wei). So, if a transaction costs 21,000 gas and the gas price is 50 gwei, the total fee would be 21,000 * 50 gwei, which equals 0.00105 ETH. Tools like Etherscan’s Gas Tracker or various dApps provide real time gas price estimates, helping users gauge current network costs.
EIP 1559 and the Burn Mechanism
The implementation of EIP 1559 on August 5, 2021, was a significant upgrade to Ethereum’s fee market. Its primary goals were to make transaction fees more predictable and to introduce a burning mechanism for a portion of the transaction fees. This upgrade was a critical step in Ethereum’s evolution, moving away from a pure auction system.
Under EIP 1559, the base fee for each block is determined by the network itself, dynamically adjusting based on how full the previous block was. If the previous block was more than 50% full, the base fee increases for the next block. If it was less than 50% full, the base fee decreases. This mechanism aims to keep block utilization around 50%, providing a more stable and predictable fee environment.
Crucially, the base fee is burned, meaning it is permanently removed from circulation. This burning mechanism has a deflationary effect on Ether, as a portion of the supply is constantly being destroyed. By Q4 2023, over 4 million ETH had been burned since EIP 1559’s activation, valued at over $10 billion. This burn rate varies significantly with network activity, increasing during periods of high demand.
While EIP 1559 did not directly lower gas fees, it made them more transparent and predictable by separating the base fee from the priority fee. Users no longer have to guess the optimal gas price to outbid others, as the base fee is set by the protocol. They only need to decide on an appropriate tip to incentivize faster inclusion.
Why Gas Fees Spike: Demand and Network Congestion
Gas fees on Ethereum are a direct reflection of supply and demand for block space. The Ethereum blockchain can process a limited number of transactions per second. When demand exceeds this capacity, users must pay higher fees to ensure their transactions are prioritized and included in a block. This competition leads to sharp spikes in gas prices.
Several factors commonly trigger these spikes. One of the most prominent is the launch of highly anticipated NFT collections. For instance, the Otherside NFT mint by Yuga Labs in April 2022 caused gas prices to skyrocket, with some users paying thousands of dollars in gas for a single transaction. The sheer volume of users attempting to mint simultaneously overwhelmed the network, pushing average gas prices well above 200 gwei for hours.
Intense DeFi activity also contributes significantly to gas spikes. During periods of high market volatility, users rush to swap tokens, provide liquidity, or manage their positions on decentralized exchanges like Uniswap or lending protocols like Aave. The increased smart contract interactions consume vast amounts of gas, driving up the base fee and priority fees as users compete for inclusion.
Beyond that, the emergence of popular memecoins or sudden market movements can trigger a frenzy of on chain activity. When a new token gains traction, thousands of users may attempt to buy or sell it simultaneously, creating a bottleneck. These sudden surges in demand quickly outpace the network’s capacity, leading to temporary but severe gas fee spikes that can price out smaller transactions.
Pre and Post Merge: What Changed for Gas?
The Merge, completed in September 2022, was one of the most anticipated events in Ethereum’s history. It transitioned the network from a Proof of Work (PoW) consensus mechanism to Proof of Stake (PoS), replacing energy intensive mining with staking. This change had profound implications for Ethereum’s environmental footprint and its long term scalability roadmap.
However, a common misconception was that The Merge would immediately reduce gas fees. In reality, The Merge primarily changed how new blocks are validated and added to the blockchain; it did not directly increase the network’s transaction processing capacity. Therefore, the fundamental dynamics of supply and demand for block space remained largely the same immediately after the transition.
Before The Merge, miners were rewarded with newly minted ETH and priority fees for securing the network. After The Merge, validators took over this role, receiving staking rewards and priority fees. The EIP 1559 base fee burning mechanism remained intact and continued to remove ETH from circulation, regardless of the consensus mechanism.
While The Merge itself did not lower fees, it was a prerequisite for future scaling upgrades, particularly sharding. Sharding aims to break the Ethereum blockchain into multiple smaller chains, allowing for parallel processing of transactions and significantly increasing throughput. The successful transition to PoS paved the way for these complex scaling solutions, which are expected to eventually alleviate high gas fees on the mainnet.
The Layer 2 Solution: Scaling Beyond Mainnet
Given Ethereum mainnet’s inherent limitations in transaction throughput, Layer 2 (L2) scaling solutions have emerged as a critical component of the ecosystem. L2s are separate blockchains or protocols built on top of Ethereum, designed to process transactions off chain and periodically settle them back to the mainnet. This approach significantly reduces individual transaction costs and increases overall network capacity.
Popular L2 solutions include Optimistic Rollups like Arbitrum and Optimism, and zk Rollups like zkSync and StarkNet. These technologies bundle hundreds or thousands of transactions into a single batch, which is then submitted to the Ethereum mainnet as one transaction. This allows the cost of the mainnet transaction to be amortized across all the bundled transactions, leading to dramatically lower fees for individual users.
For example, a token swap on Ethereum mainnet might cost anywhere from $5 to $50 or more depending on congestion, while the same swap on Arbitrum or Optimism typically costs less than $0.10. Data from L2Beat consistently shows L2 transaction fees are often 90% to 99% cheaper than mainnet. This cost reduction makes DeFi and NFT applications accessible to a much wider user base, including those with smaller capital.
The continued growth and adoption of L2s are vital for Ethereum’s long term scalability and usability. These networks effectively offload much of the transactional burden from the mainnet, allowing Ethereum to focus on its role as a secure settlement layer. Future Ethereum upgrades, such as EIP 4844 (Proto Danksharding), are specifically designed to further reduce the cost of L2 transactions, making them even more efficient.
The TCB View
TCB maintains a cautiously bullish stance on Ethereum’s long term scalability, recognizing the immediate challenges posed by gas fees but seeing a clear path forward through Layer 2 adoption. While high mainnet fees remain a significant barrier for new users and smaller transactions, they are simultaneously accelerating the crucial shift to L2 solutions, which is a net positive for the ecosystem’s health.
This dynamic creates a clear separation: Layer 2s, like Arbitrum and Optimism, win by capturing transaction volume and providing an affordable user experience, thereby solidifying their market position. The primary losers are mainnet dApps that fail to embrace or integrate L2 solutions, as their user base will naturally migrate to more cost effective alternatives.
Ethereum itself ultimately wins, as it retains its role as the secure, decentralized settlement layer for these high throughput L2s. Our read is that the burning mechanism introduced by EIP 1559 continues to make ETH a deflationary asset, adding fundamental value during periods of high network usage. Watch for the full implementation of EIP 4844 (Proto Danksharding), which TCB believes will significantly reduce L2 transaction costs by late 2024 or early 2025, further cementing their role as the dominant execution environment for everyday users.
