Ethereum Fusaka BPO Fork Raises Blob Capacity to Cut Layer‑2 Fees
Ethereum completed the second and final Blob Parameters Only (BPO) fork under the Fusaka upgrade, increasing blob capacity per block (target and maximum) to raise rollup data availability without a full hard fork. The BPO mechanism lets core developers tune protocol parameters outside the annual upgrade cycle; client teams coordinated the rollout. The change raises the target and maximum blobs per block (new parameters reported as target 14 / max 21), building on proto-danksharding from Dencun. Increased blob capacity is intended to ease rollup congestion and could materially lower Layer‑2 transaction costs — estimates in reporting suggest up to ~60% fee reductions for some rollup activity — and make rollup data fees more predictable. For traders, that implies cheaper and more reliable Layer‑2 execution for DeFi trades, NFT minting and high-frequency microtransactions, and improved scalability for settlement layers. The update is backward‑compatible and required no user action; its main market effect is to improve data availability economics for rollups and reduce operational costs for projects building on Ethereum.
Bullish
The BPO parameter increase directly improves data availability and increases capacity for rollups, lowering their per-transaction data costs and reducing congestion. Lower Layer‑2 fees and more predictable rollup economics make Ethereum a more attractive settlement layer, which should support higher on-chain activity and demand for ETH-denominated gas and settlement services. In the short term the market may price in improved throughput and lower fees, which can attract more trading volume to Layer‑2s and boost network utility — a bullish signal for ETH. In the medium to long term, sustained reductions in rollup costs could strengthen Ethereum’s competitive position versus alternative L1s, supporting ETH fundamentals. The change is parameter-only and backward-compatible, so it carries minimal technical risk of disruption; that reduces the likelihood of negative price shocks and favors positive sentiment.