2026 Ethereum L2 Panorama: Base, OP Stack, and Institutional Chain-Driven Infrastructure Reshaping

The Ethereum Layer 2 ecosystem is undergoing the most profound structural reshuffle since the birth of Rollups. In early 2026, Ethereum co-founder Vitalik Buterin publicly said that the “Rollup-centered” scaling roadmap he had set five years ago “has become invalid.” This remark was not an isolated technical discussion—it is mutually corroborated by a structural reversal in on-chain data. Meanwhile, Base has established dominance with over 46% of L2 TVL and approximately 62% of L2 fee revenue, and in February it announced a move away from OP Stack to an independent technical stack, prompting widespread doubts in the market about the overall stability of the Superchain ecosystem. And just at the beginning of May, South Korea’s largest exchange Upbit announced that it would launch its own L2 network, GIWA Chain, on OP Stack—marking the formal arrival of “institutional sovereignty chains” on the historical stage. This is a multi-front contest over the power structure, economic models, and technical routes across the L2 ecosystem.

The Year of Turning Points

Since the start of 2026, the Ethereum L2 ecosystem has seen a series of landmark events in quick succession. On January 8, Ethereum completed the final phase of the Fusaka upgrade with the “Blob Parameters Only (BPO)” fork, increasing the maximum number of blobs per block to 21—expanding the L2 data availability space by about 2.3 times compared with before the upgrade. In mid-January, CryptoRank data showed that among Ethereum’s L2 chains, only 3 chains had single-day fee revenues exceeding $5,000: Base contributed about $147,000 (nearly 70%), Arbitrum ranked second at about $39,000, and Starknet came third at about $9,000.

On February 3, Vitalik Buterin posted that most L2s still remain in a “Stage0” phase that relies on centralized security committees or multi-signature mechanisms, with only a small number of projects reaching “Stage1” decentralized governance—while “Stage2,” which would make complete trust unnecessary, is still a significant distance away. On February 18, Base announced its migration from OP Stack to a “unified autonomous technical stack,” and within 48 hours after the announcement, the OP token fell by about 28%. On March 23, the Ethereum Foundation published a long-form piece redefining the division of responsibilities between L1 and L2, proposing a new framework for building a “reciprocal ecosystem.” On March 29, Gnosis, Zisk, and the Ethereum Foundation jointly launched the Ethereum Economic Zone (EEZ) framework, aiming to address the fragmentation of L2. On May 4, Upbit announced its cooperation with the Optimism Foundation to launch GIWA Chain, becoming the first blockchain to run on OP Enterprise’s “self-governance layer.”

Structural Reorientation of the Scaling Roadmap

The core driving force behind the evolution of the Ethereum L2 ecosystem comes from a clear technical and strategic timeline.

From 2020 to 2025, it was the expansion period of the Rollup roadmap. In 2020, Vitalik proposed the “Rollup-centered” scaling roadmap, positioning L2 as Ethereum’s “branded sharding.” Over the following five years, the Optimistic Rollup camp (Arbitrum, Optimism) led early deployments, while the ZK Rollup camp (zkSync Era, StarkNet, Scroll, Linea) gradually went live on mainnet. At one point, L2 networks handled 95% to 99% of Ethereum transactions, becoming the primary execution layer for everyday trading.

2026 brings a turning point, with a substantive restructuring of the logic of the track. The turning point comes from three overlapping variables. First, Ethereum mainnet fees have fallen sharply. After the Fusaka upgrade, by early 2026 the average Gas cost on Ethereum had dropped to around $0.15, the lowest level in the network’s “modern history.” When the transaction costs on L1 are nearly indistinguishable from those on L2, users no longer have strong economic incentives to migrate to L2. Second, progress toward L2 decentralization has lagged far behind expectations. Vitalik made it explicit that some projects “have clearly stated they do not want to go beyond Stage1”—either due to technical considerations or because regulatory needs require keeping ultimate control over protocols. By early 2026, among more than 50 Rollups, only 2 have met the Stage2 decentralization standard. Third, user behavior shows a structural reflow. Data shows that L2 monthly active addresses plunged from about 58.40 million in mid-2025 to about 30.00 million in February 2026, nearly a 50% drop, while Ethereum mainnet active addresses increased from about 7.00 million to 15.00 million, doubling.

The Ethereum Foundation has planned two major upgrades after 2026—Glamsterdam and Hegotá. The former aims to raise the Gas limit from 60,000,000 to 200,000,000, which is expected to keep layer-one costs stable below $0.50. This upgrade will push L2 from simple scaling toward providing differentiated, unique value.

The Real Competitive Landscape of the L2 Ecosystem

Extreme Concentration at the Top

The concentration of leading players in the L2 ecosystem has reached an extremely high level. As of early May 2026, total Layer2 TVL is approximately $34.26 billion, nearing half of Ethereum mainnet TVL. But within this scale, the distribution is highly uneven. Base holds an absolute dominant position with about 46.6% of L2 DeFi TVL (around $5.01 billion) and approximately 62% of L2 fee revenue; Base and Arbitrum together control more than 77% of L2 DeFi TVL. In FY2025, Base generated about $75.40 million in total sequencer revenue, an increase of roughly 30 times year-on-year.

Beyond Base and Arbitrum, the top five L2s also include Optimism, zkSync, and Starknet, and together these five account for more than 85% of market share. The industry is entering a period of “L2 large-scale cleansing.”

Imbalance in Value Capture

There is a significant economic imbalance between L2s and Ethereum mainnet. Taking Base as an example: in 2025, Base’s on-chain revenue was about $75.40 million, accounting for 62% of total L2 revenue. However, in the same period, the data availability (DA) and security fees paid to Ethereum were only about $10.00 million, leaving a retention-to-payment ratio of roughly 7.5:1. This “parasitic Rollup” dynamic has been flagged as a potential risk by multiple Ethereum researchers—L2 enjoys Ethereum’s security assurances while contributing very little in returns to the underlying layer.

Extreme Polarization in L2 Fee Revenue

On January 14, 2026, CryptoRank data shows that among dozens of Ethereum L2s, only 3 chains had single-day fee revenues exceeding $5,000: Base at about $147,000, Arbitrum at about $39,000, and Starknet at about $9,000. All other L2s combined totaled about $15,000. This distribution creates intense revenue polarization within the L2 segment: the top three chains together contribute more than 95% of total L2 revenue, while the rest are in an almost “zero revenue” state.

Quantitative Comparison of Technical Camps

The L2 ecosystem can be divided into two major camps by technical route: Optimistic Rollup and ZK Rollup. The comparison between the two types across key dimensions is as follows:

Clear architectural divergence has emerged within the ZK camp. zkSync Era adopts the Type4 path—abandoning byte-by-byte EVM proofs and instead compiling Solidity into a custom ZK-optimized virtual machine, eraVM, trading proof speed for a compatibility disadvantage. Scroll chose a conservative approach—directly forking the Geth codebase—aiming for maximum compatibility with the existing Ethereum client ecosystem. It is currently at Type3, targeting an upgrade to Type2. Linea uses a Type2 strategy—directly proving unmodified Solidity bytecode—thereby combining advantages in terms of ConsenSys (MetaMask, Infura) ecosystem integration.

In terms of decentralization progress, Optimistic Rollup leads ZK Rollup. Unichain has already launched as the first Stage1 Rollup, with a fully operational permissionless fraud proof system, whereas most ZK Rollups are still constrained by the maturity of their proof systems, making it difficult to advance to the same level.

The Three-way Dispute Sparked by Base’s Independence

Base’s departure from OP Stack is one of the most controversial events in the 2026 L2 ecosystem. Public sentiment analysis shows three major disagreements among the market.

First: Is this a structural failure of the open-source business model, or a natural outcome of market choice? Critics argue that Optimism fully open-sourced the OP Stack code under the MIT license, but open-sourcing did not turn into a moat—when the largest customer, Base, has sufficient technical capability and economic incentive to operate independently, “leaving” is almost unavoidable. Data shows that in January 2026, the total Gas fees for OP Stack were about 68.2 ETH (approximately $199,700), of which Base alone contributed about 96.5%. Supporters believe that Coinbase has the user base and direct fiat on/off-ramp channels, and Base’s dominance is established first on a “distribution advantage,” with technical architecture being a secondary factor.

Second: Has the Superchain model lost its competitiveness? Base’s exit directly disrupts Superchain’s revenue structure—previously, some technical fees generated by Base flowed to the Optimism Foundation, but afterward this cash flow will be sharply reduced. Within 48 hours after the announcement, the OP token fell by about 28%. However, the Optimism Foundation had already launched a buyback mechanism in January—allocating 50% of Superchain revenue to monthly OP token market repurchases. This proposal received 84.4% support in a community vote, indicating that management already had contingency plans for revenue volatility.

Third: Is the rise of exchange L2s a neutral expansion of the ecosystem, or an amplification of centralized risks? Base’s success has sparked the exchange L2 track. Kraken launched Ink (based on OP Stack), Upbit launched GIWA Chain (the first chain on OP Enterprise’s “self-governance layer”), and alongside that, Unichain was launched earlier (by Uniswap Labs). Institution-led L2s are becoming an independent force. Optimists argue that exchange L2s can frictionlessly onboard tens of millions of retail users onto chain, making them a major user-growth engine for the entire crypto industry. Critics counter that these chains are operated by regulated publicly listed companies; their sequencer nodes are controlled by a single entity; governance is not transparent; and fundamentally, it is “private chains settling on an Ethereum settlement layer.”

Industry Impact Analysis

Reconstructing the Valuation Logic of Fundraising

Previously, L2 track valuations were built on the narrative of “inheriting Ethereum’s security.” Once Vitalik himself re-examined this narrative, the primary market valuation framework faced a systematic overhaul. Previously, L2 projects commonly raised capital at valuations of tens of billions—Offchain Labs’ Series B in 2021 had a valuation as high as $1.2 billion. But in the current market environment, the valuation premium for purely scaling-focused L2s is being rapidly compressed, and investors are starting to ask: once L1 fees have dropped to an acceptable range, how much irreplacability does a “merely cheaper” L2 truly have?

Modular Architecture Moves Toward the Mainstream

2026 is a pivotal year for modular blockchain architecture, moving from concept validation to large-scale implementation. Ethereum mainnet is increasingly becoming defined—serving as a “global settlement layer” that provides untamperable security assurances, while L2 serves as the execution layer processing the vast majority of transactions. In this architecture, the allocation mechanism of value capture has become a core topic for the industry.

Paradigm Shift in Exchange Sovereignty Chains

The launch of Upbit’s GIWA Chain marks the formal formation of the “institutional sovereignty chain” track. GIWA Chain targets Upbit’s 13.00 million registered users and positions itself as an L2 network that balances performance and regulatory compliance. As of May 3, its testnet has processed nearly 100 million transactions, and the design supports 1-second block times and EVM compatibility. This is the first blockchain launched on OP Enterprise’s “self-governance layer”—with Upbit operating the network itself, while the Optimism Foundation provides institutional-grade technical safeguards such as backups, monitoring, and failover.

The deeper industry impact of this model lies in the possibility that it could change the order of competitive factors in the L2 track. When exchanges can import their own user bases directly into their own L2s, the importance of technical differences may give way to “distribution advantages” and “compliance trust.” The relationship between Base and Coinbase has already validated this logic—an exchange with hundreds of millions of users can deliver user acquisition efficiency that no purely technical project can match. The launch of GIWA Chain suggests that in Korea and even across Asia, this model may be replicated and localized.

A Systemic Solution Appears to Address Fragmentation

Liquidity fragmentation caused by multiple independent L2s has become a core pain point in the Ethereum ecosystem. The Ethereum Economic Zone (EEZ) framework introduced at the end of March 2026 is the first systematic response to this issue. Its goal is to integrate multiple fragmented L2 networks into a unified system. Cross-rollup bridges are gradually being replaced by intention-based routing systems, and liquidity is increasingly being abstracted away from the user-experience layer. As these interoperability solutions mature, they will directly affect whether the L2 ecosystem can shift from “island competition” to “network collaboration.”

Conclusion

In 2026, the Ethereum L2 ecosystem is at a critical juncture transitioning from “rough expansion” to “structural reshuffling.” Base’s overwhelming market share proves the decisive role of “distribution advantage” in infrastructure competition; the divergence in ZK technical routes reveals that the L2 track has not yet truly converged technologically; and the launch of Upbit’s GIWA Chain indicates that “institutional sovereignty chains” will become an important variable in the next phase of competition.

For industry participants, the most worth watching is not short-term token price fluctuations, but deeper structural questions: as L1’s fee advantage is compressed, interoperability gradually matures, and institutional players enter at scale—how will the fundamental competitive elements of L2 be reset? The answer to this question will gradually become visible in the data from the second half of 2026.