TLDR
Rollups that submit data to Ethereum via EIP?4844 blobs benefit most, including Optimism (and OP Stack chains like Base), Arbitrum, zkSync Era, Scroll, Starknet, and Linea.
- Lower data?availability costs cut L2 fees and raise throughput after the Dencun upgrades, supporting real usage on rollups (analysis).
- OP Stack adopters integrated blobs early; Base and Optimism show clear fee reductions and scale effects (report).
- Arbitrum and several ZK rollups now report sub?cent typical fees, reflecting blob?enabled DA savings (social post example).
Deep Dive
1. Lower DA Costs
Blob transactions move rollup data off calldata into cheaper blobspace, materially reducing data?availability (DA) costs. That translates into lower end?user fees and higher capacity on L2s.
- Post?Dencun, Ethereums L2s saw fee compression alongside rising activity, consistent with blobs reducing settlement costs (analysis).
- Broad December data point to higher activity, lower fees across networks, with rollup DA improvements cited as a driver (market recap).
If your goal is cheaper, faster transactions, blob?enabled L2s provide the biggest fee cuts while retaining Ethereum security.
2. OP Stack (Optimism, Base)
OP Stack chains adopted blob submission quickly, and they batch a large share of retail traffic, so they capture outsized savings.
- A 2025 review highlights Dencun?driven fee reductions and identifies Bases strong profitability and share within L2s, consistent with DA savings on OP Stack chains (report).
- Sector summaries repeatedly list Optimism and Base among the main L2s tied to post?Dencun economics and consolidating profits and usage (analysis).
For mainstream apps (payments, DeFi, consumer UX), OP Stack L2s are practical choices when low average fees and broad integrations matter.
3. Arbitrum and ZK Rollups
Arbitrums batching plus blob DA can deliver sub?cent fees. ZK rollups (zkSync Era, Scroll, Starknet, Linea) especially benefit when posting large proofs or frequent batches.
- Arbitrum examples show median transaction costs around fractions of a cent, illustrating blob?enabled DA economics in practice (social post example).
- ZK rollups are repeatedly listed among the core beneficiaries of post?Dencun fee improvements and lower DA costs (sector view).
If your workload is proof?heavy or batch?intensive, ZK rollups gain meaningful cost relief and throughput headroom from blobs.
Conclusion
Blobs primarily benefit L2s that regularly post batched data to Ethereum: OP Stack chains (Optimism, Base), Arbitrum, and leading ZK rollups. The mechanism is simple: cheaper DA lowers user fees and supports more throughput and real usage on rollups (analysis). For builders and users, choosing blob?enabled L2s can reduce costs while retaining Ethereums settlement security.
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