Which L2 fees dropped after Fusaka?

TLDR

Fees on Layer 2 rollups such as Arbitrum (ARB), ethereum/">Optimism (OP), Base, and zkSync are reported to be trending lower after Ethereums Fusaka upgrade, driven by cheaper data availability and more predictable blob pricing (overview).

1. Many sources cite an expected 4060% reduction in L2 transaction costs as PeerDAS and expanded blob capacity take effect (upgrade summary).
2. Early observations show the blob base fee near $0.03%%CKPROTECTED2%%, improving cost predictability for rollups (market update).
3. Impact varies by network and traffic; initial post-upgrade volatility (including a brief spike on Arbitrum) was noted before conditions stabilized (post-activation note).

Deep Dive

1. Affected Rollups

Rollups named in coverage that should see lower, more predictable fees include Arbitrum, Optimism, Base, and zkSync. These networks batch transactions and publish them as data blobs to Ethereum; Fusaka lowers that cost and smooths price swings (rollup list and effects). Evidence points to reductions being gradual as each L2 upgrades its stack and adapts capacity.

2. Why Fees Drop

Fusaka introduces PeerDAS (data availability sampling) and expands blob capacity, letting nodes verify small samples instead of full blobs. This cuts infrastructure load and makes posting L2 data to Ethereum cheaper, which directly lowers L2 transaction costs (technical summary). Developers also highlight raised L1 gas limits and future blob-only forks that can further tune capacity without full hard forks, supporting sustained L2 scalability (developer perspective).

3. Variability and Caveats

Initial conditions were mixed, with short-lived fee spikes reported by Arbitrum contributors before settling. The broader trend is toward lower and more predictable L2 costs rather than an instant, uniform drop across all networks (post-activation note). Meanwhile, blob base fees remained very low around $0.03%%CKPROTECTED3%%, improving cost forecasting for L2 operators despite temporary blob gas price noise (market update).

Conclusion

Fusaka reduces data availability costs and stabilizes blob pricing, so L2s like Arbitrum, Optimism, Base, and zkSync should see fees trend lower as upgrades roll out. The magnitude depends on each rollups adoption pace and network load, with early volatility giving way to more predictable, lower-cost execution over time.