TLDR
The ETH Fusaka upgrade changed two fee levers: it added a minimum blob base fee tied to L1 execution fees, and expanded blob capacity so L2 data fees trend lower over time.
- Blob fees now have a floor, roughly execution base fee divided by 16, ending near?zero blobs and adding to ETH burn (EIP?7918 overview).
- L2 data publication costs should fall as PeerDAS and higher blob capacity kick in, often cited as a 40%60% reduction for rollups (analysis).
- Mainnet gas math is unchanged, but capacity rose (block gas limit to 60 million) and blob pricing was stabilized to avoid collapsing during volatility (update).
Deep Dive
1. Blob Fee Floor
Fusaka introduces a minimum blob base fee so blobs can no longer price at near zero. This floor is tied to the L1 execution base fee at roughly one?sixteenth, reinforcing value capture and burn from L2 activity (Bitwise summary).
Some industry coverage notes the new minimum mechanism puts blob fees into the ETH burn path and prevents free riding by rollups, which were previously able to post data at negligible cost in quiet periods (industry note).
ETH burn should reflect real L2 usage more consistently, tightening the link between network activity and ETH supply dynamics.
2. L2 Cost Path
Fusaka expands data throughput for blobs and enables PeerDAS, where nodes verify samples instead of full blobs, cutting bandwidth and letting rollups post more data at lower cost over time (explainer).
Coverage around activation framed a 40%60% L2 fee reduction as a reasonable range once systems adapt, driven by greater blob capacity and DA efficiency (activation brief). Short?term turbulence is possible as settings equilibrate, and some observers even noted temporary fee spikes right after the fork (post?fork check).
Expect rollup fees to trend down as clients and sequencers tune parameters, but allow for bumpy early days.
3. Mainnet Gas and Capacity
Fusaka does not change the core L1 gas formula, but it raises the block gas limit to 60 million, increasing settlement capacity for transactions and L2 batches during peaks (network update).
The upgrade also stabilizes blob pricing so fees do not collapse or dislocate when L1 gas shifts, improving predictability for rollups that batch transactions into blobs (fee behavior note).
Users should not expect instantly cheaper L1 gas, but greater throughput and steadier blob pricing reduce congestion risk and support lower L2 all?in costs.
Conclusion
Fusakas fee changes focus on aligning L2 costs with L1 resource use and scaling blob capacity. The new blob fee floor strengthens ETH burn, while PeerDAS and higher capacity set a path for lower L2 fees. In the near term, fees can be choppy as parameters settle, but the design aims for more predictable costs and better scalability over time.
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