MEV Bots Account for Over 50% of Ethereum L2 Gas Fees
Maximal Extractable Value (MEV) bots are reportedly burning over half of all gas fees on Ethereum Layer-2 networks. This activity highlights the growing economic impact of MEV on scaling solutions and has intensified discussions around the need for privacy and fair market structures to mitigate their effects.
- While accounting for over 50% of gas consumption on major L2s like Base and OP Mainnet, MEV bots contribute less than 10% of the total fees, creating a significant economic inefficiency. This heavy usage by bots, driven by "search spam," leads to a consistently high baseline for transaction fees for all other users. - The primary strategy for MEV bots on L2s without a public mempool is a high-volume, low-success-rate approach of submitting transactions that read prices across multiple on-chain exchanges to find arbitrage opportunities. For instance, one successful arbitrage on Base, which profited only $0.12, required the bot to send approximately 350 transactions, consuming a massive 132 million gas—equivalent to nearly four full Ethereum blocks. - This issue is highly concentrated, with just two "searcher" bots being responsible for over 80% of the MEV-related spam on the Base network. This concentration highlights the specialized and competitive nature of MEV extraction. - The Solana network faces a similar challenge, where MEV bots searching for arbitrage have at times accounted for 60% of block compute, with over 98% of those arbitrage transactions failing. This has led to network congestion and a poor user experience during periods of high volatility. - To combat the negative effects of MEV, solutions like CoW Swap use batch auctions and off-chain "intents" to shield users from front-running and sandwich attacks. By grouping trades together and settling them simultaneously, it obscures individual transaction details from predatory bots. - Other proposed solutions for L2s include encrypted mempools, where transaction details are hidden until they are finalized, and shared sequencer networks that create a common, more secure environment for multiple rollups. - The problem is not limited to DeFi, as NFT mints on Solana have also been heavily targeted by MEV bots attempting to acquire as many NFTs as possible at the launch, leading to network congestion. - Cross-chain MEV is an emerging frontier, where bots exploit price discrepancies of the same asset across different blockchains, including L2s, creating complex arbitrage opportunities.
