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While 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.
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.
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, 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.
Blob 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.
The 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.
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