Effect of Ethereum’s Fusaka Upgrade on Application Developers

Ethereum’s Fusaka upgrade (Q4 2025) marks a turning point not only for Layer 1 and Layer 2, but also for the builder ecosystem application developers and tooling/infrastructure teams. While end users benefit from cheaper transactions and faster confirmations, developers are the ones who must adapt and innovate to fully unlock Fusaka’s potential.

This blog explores how Fusaka reshapes development, from application design and cost modeling to infrastructure updates and monitoring tools.

• Building Smarter Apps
• Tooling & Infrastructure Developers
• Long-Term Benefits for Builders

Building Smarter Apps

PeerDAS (EIP-7594) allows applications with high data needs such as zk-proofs, AI/ML contracts, and blockchain games to scale without prohibitive costs. Developers can rely on Ethereum handling 128+ blobs per block in the future.

Blob Parameter Only (EIP-7892) ensures predictable blob scaling, letting developers plan roadmaps without redesigning apps due to sudden capacity issues. Blob Base Fee Improvements (EIP-7918) stabilize blob fee markets, making transaction cost modeling more reliable for apps like NFT marketplaces and DeFi protocols.

Cryptographic Enhancements (EIP-7823, 7883, 7951) give access to safer ModExp operations and native secp256r1 support enables direct integration with billions of devices like iPhones and Android hardware wallets.

The new CLZ opcode (EIP-7939) reduces gas for math-heavy contracts, while gas limit increases (EIP-7935) support more complex contracts running on Layer 1. In short, developers can now build richer, cheaper, and more predictable applications on Ethereum.

Tooling & Infrastructure Developers

For infrastructure teams, Fusaka introduces foundational changes that require significant updates:

1. PeerDAS Proof Formats demand block explorers, indexers, and APIs to handle distributed data sampling and availability proofs.
2. Frequent BPO Hardforks (EIP-7892) require monitoring systems and upgrade trackers to support smaller, more frequent updates.
3. Fee Estimation Tools must implement new reserve price logic (EIP-7918) for accurate blob pricing.
4. History Expiry (EIP-7642) saves ~530GB per node sync, reducing infra costs but requiring historical data APIs to adjust.
5. Deterministic Proposer Lookahead (EIP-7917) means MEV searchers, builders, and preconfirmation services must integrate predictable proposer schedules.
6. Monitoring & Security Tools need updates for new ModExp pricing, block size limits, and increased gas limits to prevent overloads.

The initial workload may be high, but the result is lighter, faster, and more resilient infrastructure.

Long-Term Benefits for Builders

Both application developers and infrastructure teams benefit from Fusaka’s alignment with Ethereum’s long-term scaling goals:

• Application Developers get stability in blob economics, new cryptographic capabilities, and cheaper computations.
• Tooling & Infrastructure Developers gain efficiency from lighter nodes, predictable proposer schedules, and a clearer scaling roadmap.

Together, these improvements foster developer confidence and encourage more ambitious applications to be built on Ethereum. Application developers can scale ideas that were previously impractical, while infrastructure teams prepare the ecosystem for continuous growth.

In effect, Fusaka ensures that Ethereum is not just scaling for users, but also empowering the builders who drive innovation across DeFi, NFTs, gaming, and beyond. Fusaka gives developers the confidence to build for the future—knowing Ethereum’s base layer and infrastructure are evolving right alongside them.