Ethereum's Fusaka Upgrade: How PeerDAS, BPO, and EIP-7918 May Restore ETH Deflationary Pressure

Source: Blockworks Original Title: Ethereum’s Fusaka upgrade lands today Original Link: https://blockworks.co/news/fusaka-update-today

Market Overview

Today markets leaned decisively risk-on, with crypto leading the move while traditional assets stayed muted. Ethereum’s Fusaka upgrade arrived with PeerDAS, BPO hard forks, and the under-discussed EIP-7918, which together may finally restore deflationary pressure on ETH. On the thematic front, Sui is making an aggressive full-stack push into robotics, positioning onchain coordination, settlement and telemetry as critical primitives for a coming wave of real-world machines.

Market Performance

Markets leaned firmly risk-on, with crypto broadly outperforming traditional assets. BTC (+5.8%) sat mid-pack, while equities were muted. The S&P 500 (+0.3%) and Nasdaq 100 (+0.9%) barely budged. Gold (-0.3%) slipped, and crypto miners were the clear outlier to the downside (-8.7%), suggesting profit-taking and sensitivity to BTC’s consolidation.

The crypto sector breadth was exceptionally strong. Oracles, lending and the broader Ethereum ecosystem led the board, signaling a clear rotation back into core infrastructure and high-utilization protocols. DeFi, Modular, the Solana ecosystem, and perps followed close behind with similarly solid showings, pointing to broad appetite for beta across liquid alt sectors. Lower down the stack, L2s, AI plays, launchpads and gaming tokens all moved higher, while more speculative areas like memes lagged. The only clear pockets of weakness were crypto equities and miners especially, which saw meaningful pullbacks.

The move fits with improving sentiment as macro headwinds ease. Yields stabilized, liquidity indicators firmed, and positioning metrics suggest investors are adding risk after a muted stretch. Strong rebounds in infra sectors imply expectations for higher onchain activity and potential catalysts from upcoming protocol upgrades.

The Fusaka Upgrade Explained

Today is Fusaka day in Ethereum land, the second upgrade this year. It’s not often that Ethereum has two upgrades in one year, and that’s because Fusaka is more of a half-upgrade. During the initial development of the Fusaka upgrade, any feature that carried a risk of delaying the fork, such as those requiring more research or having high complexity, was deprioritized and removed from the scope.

There are 12 EIPs scheduled for inclusion in this upgrade, with the headliner being PeerDAS. PeerDAS introduces data availability sampling, which allows validators to share the load of blobs, effectively allowing for an increase in blobs per block.

Key Components

PeerDAS & Blob Capacity: Blobs have failed to hit their target of six per block, and just when it looked like they were about to, Ethereum is looking to raise the target again. Technically, Fusaka will not be raising the blob target, but is instead introducing Blob Parameter Only (BPO) hard forks. This creates a separate and easier process to adjust blob storage parameters. So instead of waiting for a major upgrade, Ethereum can make smaller, more frequent adjustments to blob capacity.

With supply exceeding demand, the blob gas price has been largely immaterial (apart from a few blips here and there when the blob price reached a measly 1 gwei). Post-Pectra, between June and October, Ethereum generated around $900 in blob fees. The brief spike in November brought this to ~$23,000. Still not material, but it highlighted the order-of-magnitude difference when blobs actually have a market.

EIP-7918 - The Overlooked Upgrade: EIP-7918 addresses the blob fee market problem by introducing a reserve price tied to execution costs (a floor price of sorts). When L2 execution costs dominate blob costs, this prevents the blob fee market from becoming ineffective at 1 wei. If EIP-7918 was introduced on June 1, 2025, burnt blob fees would have been nearly 8x more. The upgrade isn’t only a reserve pricing model, it also presents more price stability and predictability, avoiding dramatic fee spikes when the blob market becomes inelastic.

Implications for ETH

Together with PeerDAS and BPO, this suggests that as Ethereum scales L2 capacity, blob fees should go up as well (historically, this relationship has been strictly inverse). For ETH holders, this, combined with L1 scaling, can hopefully return the ETH supply to a deflationary phase.