Ethereum's Dencun Upgrade One Month Later: Layer2 Fees Plummet, New DeFi, Gaming, and NFT Paradigms Emerge

Ethereum's Dencun Upgrade: One Month In – Reshaping the Layer2 Landscape and New DApp Narratives

It has been one month since Ethereum completed its highly anticipated Dencun upgrade. The activation of its core feature, EIP-4844 (Proto-Danksharding), aimed to drastically reduce the cost for Layer2 networks to submit data to the Ethereum mainnet by introducing a "Blob" data storage method. Now, the "full moon effect" of the upgrade is becoming increasingly apparent, not only profoundly altering the competitive dynamics among major Layer2 networks but also potentially unlocking new realms of imagination for application innovation across the entire Ethereum ecosystem.

I. The Cost Revolution: Layer2 Fees Enter the "Sub-Cent Era"

The most direct and significant outcome of the Dencun upgrade is the cliff-like drop in transaction fees. Previously, the primary cost component for Layer2 networks was the fee for publishing transaction data (calldata) to the Ethereum mainnet. EIP-4844 provides a cheaper data availability solution for Layer2s by introducing an independent, more affordable Blob data space.

Monitoring from multiple blockchain data platforms shows that following the upgrade, transaction fees on mainstream Layer2 networks have generally decreased by over 90%. For example, the cost of a standard transfer on Arbitrum and Optimism has dropped from several dollars pre-upgrade to fractions of a dollar or even less. Networks like Base (built on OP Stack and backed by Coinbase), as well as emerging players like zkSync Era and Starknet, have seen their transaction costs fall to similar or even lower levels. Market data indicates that simple transaction costs on some networks during non-congested periods have entered the realm of "cents" or even "millicents," bringing the user experience infinitely closer to that of Web2 applications.

The significance of this "cost revolution" is profound. For the first time on a practical scale, it has made Ethereum's scalability vision—achieving high-speed, low-cost transactions through Layer2 while relying on the mainnet for security—a large-scale reality. The removal of the fee barrier paves the way for high-frequency, micro-value, and social application scenarios.

II. The Evolving Ecosystem: From a "Three-Kingdom Rivalry" to a "Hundred Flowers Bloom"

The dramatic reduction in fees is reshaping the competitive landscape of Layer2. Before Dencun, the market structure was relatively clear, with Arbitrum and Optimism leading in Total Value Locked (TVL) and developer activity. However, as cost differentials are largely erased, the focus of competition is shifting from simply being "cheaper" to technical features, ecosystem support, user experience, and deep development in specific niches.

• Arbitrum & Optimism: Consolidating Advantages, Expanding Horizons: As leaders, both are leveraging their mature ecosystems and large user bases to expand into more vertical domains while benefiting from the fee reduction. Arbitrum's Stylus initiative aims to attract developers from traditional programming languages, while Optimism's "Superchain" vision seeks to build an interconnected network of Rollups via the OP Stack.
• Base: The Vanguard of Social and On-Chain Consumption: Backed by Coinbase's massive user traffic and fiat on-ramps, the Base network has experienced explosive growth post-fee reduction. Its transaction count and active addresses have surged to top ranks. With extremely low fees, SocialFi applications like Friend.tech, along with various on-chain mini-games and Memecoin culture, are exceptionally active on Base, shaping its distinct identity as a "consumer-grade application chain."
• The ZK-Rollup Camp: A Period to Realize Technical Advantages: For ZK-Rollups like zkSync, Starknet, and Scroll, the Dencun upgrade is equally timely. While they inherently offer higher theoretical finality efficiency, their advantages were partly offset by previously high data costs. With the cost bottleneck removed, the privacy and efficiency potential brought by zero-knowledge proofs could make them more attractive for DeFi, gaming, and other scenarios requiring complex computation and higher security guarantees.
• Emerging & App-Specific Chains: A Window of Opportunity Opens: Lower costs also reduce the barrier to launching a new Rollup or application-specific chain. More projects are considering building dedicated, highly customized app-chains, utilizing shared sequencer networks or data availability layers. The Layer2 battleground is evolving from competition among a few general-purpose chains to a diverse network encompassing general-purpose chains, app-chains, and ecosystem-specific chains.

III. Budding New Narratives: A "Cambrian Explosion" of DApp Innovation

A near-free transaction environment is the best catalyst for application innovation. Post-Dencun, the new application paradigms likely to emerge on Ethereum's Layer2s have become a focal point of market attention.

1. DeFi: From "Asset Protocols" to "Behavior Protocols"

Traditional DeFi, like lending and trading, will see improved capital efficiency and user experience due to lower friction. However, the greater potential lies in how minimal costs make the precise quantification, incentivization, and financialization of user on-chain behavior possible. For example:

• High-Frequency Rebalancing & Strategy Automation: Complex, high-frequency asset management strategies (e.g., liquidity provision strategies adjusted every minute), previously unfeasible due to high costs, become economically viable.
• Frictionless Payments & Subscriptions: Leveraging ERC-4337 account abstraction and low gas fees to enable true "one-click payments" or monthly auto-debit subscriptions for on-chain services.
• Micro-Insurance & Prediction Markets: Insurance products for micro-scenarios like a single transaction or trip, or ultra-low-barrier prediction markets around entertainment or sports events, become operational.

2. Gaming & the Metaverse: True On-Chain Experience Becomes Possible

Gaming has long been an area blockchain seeks to conquer, but high fees were a major roadblock. Now, players can engage in frequent, small-value asset interactions (like minting gear, trading items, claiming level rewards) without cost concerns. This removes a key obstacle for fully on-chain games and complex economy-driven metaverse projects, allowing game logic and asset ownership to integrate more deeply with the blockchain.

3. NFTs & Digital Assets: Dynamic, Programmable, and Social

NFTs will no longer be just static JPEGs. Low fees enable NFTs to change state frequently, record data, or interact with other assets. Examples include:

• Dynamic, Evolving NFTs: NFTs that level up or change appearance based on the holder's on-chain activities (like trading, participating in governance).
• Large-Scale, Composable NFT Applications: The operational costs for NFT metaverse projects requiring massive on-chain interaction, like Parallel, will be significantly reduced.
• Monetizing Social Graphs: Models that tokenize social relationships via keys, exemplified by Friend.tech on Base, rely on a low-cost environment for sustainability. This may be just the beginning of social assetization.

4. AI & Blockchain Convergence Experiments

Putting AI model inference or decision-making processes on-chain, or training AI agents based on on-chain data, requires massive, low-cost transaction interactions. The post-Dencun Layer2 environment provides the necessary testing ground for AI-blockchain convergence, potentially giving rise to new concepts like decentralized AI marketplaces or verifiable AI services.

IV. Challenges & Outlook: Concerns Amid Prosperity and the Path Forward

Despite the bright prospects, the Layer2 ecosystem still faces challenges in the "post-Dencun era." First, centralized sequencer risk. Currently, the sequencers (responsible for bundling transactions) for most Layer2s are operated centrally by the projects, introducing potential single points of failure and censorship risks. Decentralizing sequencers is a critical issue for the next phase.

Second, long-term reliance on Data Availability (DA). Currently, Blob data is only stored on the mainnet for about 18 days. Long-term storage still depends on the Ethereum mainnet or third-party DA layers. Ensuring the long-term accessibility and security of this data is key to sustaining ecosystem trust.

Finally, liquidity fragmentation and cross-chain experience. As the number of Layer2s and app-chains proliferates, assets and liquidity are scattered across different chains. Although cross-chain bridge technology is advancing, providing users with a seamless and secure cross-chain experience remains a significant engineering and governance challenge.

Looking ahead, the Dencun upgrade is a milestone on Ethereum's scaling roadmap, but it is by no means the finish line. With further upgrades like Verkle Trees and history expiry on the horizon, the mainnet's capacity will continue to improve. Competition among Layer2s will fully enter a stage of comprehensive capability比拼 (competition), centered on developer tools, user experience, vertical ecosystem development, and degree of decentralization. For investors and developers, focusing on projects that can rapidly build sticky user communities and unique value-capture mechanisms in this low-cost environment may help capture early signals of the next growth cycle.

Risk Disclosure

The above content is based on analysis of publicly available market information and is for reference only, not constituting any investment advice. The cryptocurrency market is highly volatile, and Layer2 technology is still in a rapid development phase, carrying risks such as technical vulnerabilities, changing regulatory policies, and intensifying market competition. Before making any decisions, investors should conduct independent due diligence, fully understand the associated risks, and proceed with caution.