Ethereum's Dencun Upgrade: How Plummeting Fees Are Reshaping the Layer 2 Competitive Landscape

Ethereum Post-Dencun Data Analysis: How is the Layer 2 Landscape Being Reshaped?

It has been over a month since the successful deployment of Ethereum's highly anticipated Dencun upgrade. The core of this upgrade—EIP-4844 (Proto-Danksharding)—aimed to drastically reduce the cost for Layer 2 (L2) networks to submit data to the Ethereum mainnet by introducing "blob" data storage. As the dust settles, market data is beginning to outline the direct impact and reveal its potential to reshape the entire L2 competitive landscape. This article will provide a deep analysis of the performance and evolving competitive dynamics of major L2s in the first month post-upgrade, examining multiple dimensions including fees, transaction volume, Total Value Locked (TVL), and user growth.

Plummeting Fees: The Blob Effect is Immediate, But Benefits Are Uneven

The most direct and significant outcome of the Dencun upgrade is the reduction in transaction fees. According to multiple blockchain data providers, gas fees on major Optimistic Rollup and zk-Rollup networks plummeted within hours of the upgrade's completion. Market data shows that transaction costs on some L2 networks dropped from several dollars pre-upgrade to fractions of a dollar or less—a decrease of over 90%.

However, the distribution of these fee savings has not been equal. Public market discussion and data analysis indicate that leading, high-activity L2 projects using Rollup technology, such as Arbitrum, Optimism, and Base, have seen the most noticeable fee reductions for their users. This is primarily because their high frequency of data submissions allows them to more fully utilize the cost savings from blob space. For some emerging or lower-volume L2 networks, where the base cost of data submission was already low, the perceived reduction for users may be less dramatic. Furthermore, the fee structure has shifted: the proportion of costs attributed to the L2 network's own operations has increased, while the portion paid to the Ethereum mainnet for data has significantly decreased.

Transaction Volume & Network Activity: Short-Term Surge vs. Long-Term Test

Low fees have acted like a shot of adrenaline for the market. In the short term following the upgrade, daily transaction counts and active address numbers on several major L2 networks saw significant growth. Reports indicate that some networks hit all-time highs in transaction volume during the upgrade week, widely attributed to users being drawn by extremely low costs to transfer funds, interact with protocols, and try new applications.

Whether this activity surge, fueled by the "fee dividend," can be sustained is key to observing shifts in the landscape. On one hand, the low-fee environment genuinely lowers the barrier to entry, helping to attract new users and foster more application scenarios requiring high-frequency interaction (like gaming and social finance). On the other hand, long-term transaction volume ultimately depends on the value-capture ability of applications within an ecosystem and user retention. The market is now watching to see which L2 networks can leverage their unique application ecosystems, developer friendliness, or technical innovation to convert short-term traffic into sustained, organic growth after the initial fee-driven hype subsides.

TVL & Capital Depth: Steady Migration & Intra-Ecosystem Circulation

Total Value Locked (TVL) is a key metric for measuring the capital depth and user confidence in an on-chain ecosystem. According to data tracking platforms like DeFiLlama, the aggregate TVL across the Ethereum mainnet and major L2s has remained relatively stable post-Dencun, with no signs of large-scale, rapid cross-chain capital migration triggered by the upgrade.

This reflects two characteristics of current market behavior: First, capital allocation among L2s is already relatively mature and stable, with leading L2s like Arbitrum and Optimism having built deep liquidity moats based on first-mover advantages. Second, the fee reduction from the upgrade likely promotes more efficient capital circulation *within* individual L2 ecosystems—for example, users are more willing to move and allocate funds between different DeFi protocols at low cost, rather than rushing to transfer funds to another L2 that also has low fees. Therefore, competition for TVL is shifting focus towards the growth of native assets within an ecosystem, the emergence of innovative protocols, and the optimization of cross-chain bridge experiences, rather than relying solely on fee advantages to attract one-time external inflows.

User Growth & Developer Appeal: The Deep-Seated Forces Reshaping the Landscape

Users and developers are the foundation of any blockchain ecosystem. By lowering fees, the Dencun upgrade has theoretically widened the user acquisition funnel for all L2s. Address growth data from third-party analytics platforms shows a small peak in new address creation on multiple L2 networks following the upgrade.

The deeper competition lies in the battle for developers. Low and predictable data costs make the economic model for building and operating applications on L2s more viable, especially for application types extremely sensitive to transaction costs. Some industry observers believe this could prompt more developers to return to the Ethereum L2 ecosystem from other high-performance blockchains or spur entirely new application innovation. Currently, L2s like Base (backed by strong ecosystem resources like Coinbase) and those emphasizing zero-knowledge proof technology like zkSync and Starknet are actively attracting builders through developer grant programs and technical tooling improvements. In the future, which L2 can incubate the next phenomenal "killer app" may become the decisive factor in altering the current "multi-power" landscape.

Evolving Competitive Dynamics: From a "Three-Kingdom Rivalry" to a "Multi-Dimensional Contest"

Before the Dencun upgrade, the L2 competition narrative largely revolved around "fees." Post-upgrade, with fees no longer an overwhelming bottleneck, the dimensions of competition have become more diverse and multi-faceted.

• Diverging Technical Paths: The rivalry between Optimistic Rollups (e.g., Arbitrum, Optimism) and zk-Rollups (e.g., zkSync, Starknet, Linea) has entered a new phase. The former boasts mature ecosystems, while the latter holds theoretical advantages in finality and withdrawal speed and is accelerating technology implementation and ecosystem development.
• Ecosystem Specialization: Each L2 is beginning to emphasize differentiated positioning. For instance, Arbitrum continues to solidify its position as a DeFi and derivatives trading hub; Base, leveraging its integration with Coinbase, is active in the social and consumer crypto application space; emerging projects like Blast are attempting to introduce novel concepts like native yield to L2.
• Interoperability & the "Superchain" Vision: The "chain factory" model, represented by Optimism's OP Stack and Arbitrum's Orbit tech stack, is spawning numerous application-specific chains or L3s. In the future, seamless interoperability between L2s/L3s within the same tech stack could become a new competitive moat and form alliance blocs.

Consequently, the current L2 landscape is evolving from a simple contest of fees and TVL into a "multi-dimensional competition" encompassing technology, ecosystem, developer community, user experience, and strategic alliances.

Conclusion & Outlook

Ethereum's Dencun upgrade has successfully achieved its primary goal: to "lighten the load" for Layer 2 networks. One month of data shows the fee reduction effect is real and substantial, having stimulated short-term network activity and removed a major obstacle for the ecosystem's long-term development.

However, the upgrade has not immediately caused a disruptive reshuffling of the market landscape. Instead, it has pushed competition to a deeper level. Leading L2s are leveraging their established ecosystem advantages to convert the fee dividend into stronger user stickiness and developer appeal. Simultaneously, competition based on differentiated technology, architecture, and ecosystem positioning is becoming increasingly prominent. In the future, the winning formula in the Layer 2 race will depend on which networks can best utilize the low-cost environment to incubate native applications with sustained value and network effects, and build ecosystem structures and developer cultures that are difficult to replicate. The Dencun upgrade is not an endpoint, but the starting point of a new chapter in Ethereum's scaling narrative and L2 ecosystem evolution.

Risk Disclosure

The above content is based on publicly available market information and data analysis, intended solely for information sharing and market research, and does not constitute investment advice of any form. The blockchain industry and cryptocurrency markets are highly volatile and carry significant risk. Layer 2 technology is still rapidly developing, and its security, degree of decentralization, and long-term sustainability face numerous unknown challenges. Readers should conduct their own independent due diligence and consult a professional financial advisor before making any decisions, bearing full responsibility for their own investment choices.