# The Rollup Cost Killer

> How Blob Aggregation Slashes L1 Execution Fees for Rollups

**Published by:** [Spire Labs](https://paragraph.com/@spire/)
**Published on:** 2025-06-27
**URL:** https://paragraph.com/@spire/the-rollup-cost-killer

## Content

tldr; We can save rollups thousands of dollars on Ethereum transactions. Get in touch today to stop wasting money!The Execution Layer Cost CrisisWhile blob fees get the attention, the reality is that for rollup operators the execution layer gas costs are currently the bulk of the cost for running most rollups. Blob fees are such a small part of the cost to advance a rollup that EIPs are being created to keep them from dropping too low and multiple proposals have been made to modify their pricing in order to improve Ethereum’s economics. Anders Elowsson 🌻 @weboftrees Apples of the Infinite Garden: A Children's Book on EIP-7918 Audrey the Auctioneer, Pontus the Ponderer and Therese the Tree Tender have started an apple orchard in a huge garden. The friends have a vision: feeding the world with apples. Let's follow them on their journey 129 5:23 AM • Apr 25, 2025 This cost impacts blob submission rate and therefore the time-to-finality and time-to-withdrawal for users on L2s. The following thread shows how Scroll has 7x’ed their time-to-finality likely because blob submission costs are too high to justify posting blobs more often. donnoh.eth 💗 @donnoh_eth to give a concrete example, @Scroll_ZKP recently switched from posting a proof every 30 minutes on average to 3h 30min (x7) on average, because not sustainable. slot times from 12s to 6s is an insignificant improvement in this context 5 11:55 AM • Jun 21, 2025 Current Reality: Each rollup pays full execution costs for their individual blob submissions. The Numbers: You can see a breakdown of the costs of blob submission for Taiko in the dune query below.Taiko exec layer blob submission costsTaiko, at the time of this post, sees an average of ~$20k/week in total blob transaction costs since Pectra. i.e. On a weekly average rollups spend ~99.999% of their total blob submission costs on execution layer transactions alone. Looking at the data for the week of 2025-06-09 Taiko paid $21,101.58 in total fees, with less than a cent going specifically to the cost of blobs and everything else going to execution layer costs. This means rollups are spending tens of thousands of dollars on transaction overhead rather than data availability.The Blob Aggregation RevolutionBlob aggregation helps to solve both blob AND execution layer costs. When multiple rollups can submit blobs using the same L1 transaction the 21k min gas cost is only paid once and the cost can be split across the rollups participating in the aggregation. For Taiko that 21k gas cost is still ~$2k/week. If those transactions were paired with another rollup’s that would be ~$4k/month in savings or the ability to post blobs more often and halve the time-to-finality for the chain. If we had 10 rollups all posting together that 21k in gas would cost ~$200/week with $7,200/month in savings. Of course, this is only a baseline savings estimate for execution costs. When blob pricing EIPs land on mainnet and/or blob saturation is reached the savings will be even greater.ConclusionThe execution layer cost savings from blob aggregation represent a fundamental shift in rollup economics. By eliminating redundant transaction overhead rollups can achieve significant cost reductions to improve their profitability while improving reliability and user experience at the same time. Don't miss out! Register now through our sign-up form to secure your place for our mainnet launch and start saving on execution costs immediately!

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