L2 fees halve after upgrades
- Transaction costs on Ethereum layer‑2 networks fell roughly 50% after recent upgrades, cutting execution costs. - Lower fees increase accessibility for retail and algorithmic agents, supporting higher‑frequency DeFi interactions. - Cheaper L2s shift fee capture dynamics and could materially change where automated strategies prefer to execute (x.com).
Ethereum’s latest scaling upgrades made many layer‑2 transactions materially cheaper, with data costs for rollups collapsing after Ethereum expanded blob capacity in May 2025. (ethereum.org) Ethereum’s March 13, 2024 Dencun upgrade introduced “blobs,” a temporary data format that lets rollups post transaction data to Ethereum more cheaply than permanent calldata. Ethereum says blobs stay available for about 18 days, long enough for rollups’ security model while cutting storage costs on the base chain. (ethereum.org) The next step came on May 7, 2025, when Ethereum’s Pectra upgrade raised the blob target from 3 to 6 per block and the maximum from 6 to 9. Galaxy Research said rollups were buying about 21,200 blobs a day before Pectra and about 25,600 after it, while blob prices fell so far that they were “virtually free again” in the days after the upgrade. (blog.ethereum.org, galaxy.com) Layer‑2 fees have tracked that drop in data costs. The Block’s fee chart, updated April 16, 2026 using Growthepie data, shows leading Ethereum rollups such as Base, Arbitrum, Optimism, Scroll and Starknet spending much of early 2026 at only a few cents or less per transaction on a 7‑day moving average. (theblock.co) On networks built with the OP Stack, the savings flow through one specific fee line: the layer‑1 security fee charged for posting compressed transaction data back to Ethereum. Base’s documentation says every Base transaction has an L2 execution fee and an L1 security fee, and Optimism’s Ecotone proposal said adopting blobs could cut overall transaction fees by as much as about 80x under favorable conditions. (docs.base.org, gov.optimism.io) That changes who can afford to use these networks. Lower costs make small swaps, rebalances and arbitrage trades easier to run on rollups, and they reduce the penalty for strategies that need to update positions frequently instead of waiting for larger price moves. (ethereum.org, docs.base.org) The economics also shift for Ethereum itself. Galaxy said the post‑Pectra collapse in blob pricing sharply reduced the amount of ETH burned from rollups buying blob space, even as rollups’ own margins improved because their data‑publishing costs fell. (galaxy.com) The tradeoff is that cheaper blob space can mean more data for nodes to hold before pruning. Galaxy estimated consensus‑layer nodes may now need to maintain as much as 44.6 gigabytes of blob data between pruning windows, up from earlier levels, even though the data is not stored forever. (galaxy.com, ethereum.org) For traders and developers, the practical question is no longer whether Ethereum can make rollups cheaper; that happened with Dencun and deepened with Pectra. The next question is which rollups pass those savings through most consistently as fees, volumes and automated activity keep moving off the main chain. (ethereum.org, ethereum.org, l2beat.com)
