Ethereum Layer-2 Consolidation: Base and Arbitrum Dominate 80% of DeFi
In brief
- Base and Arbitrum control over 80% of layer-2 DeFi total value locked
- Linea's bridge deposits fell 60% from November 2025 to May 2026
- General-purpose chains shift focus to specialized use cases amid consolidation
- Industry consensus: market overbuilt general-purpose layer-2 networks
The Boom, Then the Bust
Ethereum layer-2s exploded over the past several years as improvements in rollup technology reduced the cost and complexity of launching new chains. Rollups work by processing transactions off Ethereum's main blockchain, bundling hundreds of them together, and then periodically posting compressed transaction data back to Ethereum for settlement and security. The result was a proliferation of chains, each promising unique advantages.
Then came the reckoning. Zero Network announced it was shutting down last month. Linea's deposits, for example, fell from $976 million in November 2025 to $367 million in May 2026, a decline of more than 60%. The pattern repeats across the ecosystem.
Why the Market Overbuilt
Observers agree the problem was simple: too many chains doing the same thing. Ben Fisch, co-founder and CEO of Espresso Systems, put it bluntly:
There were way too many general-purpose layer twos, which frankly don't make sense as a product, because there's no reason to have many, many versions of the same thing.
Ethereum creator Vitalik Buterin has urged developers to rethink the network's long-term scaling roadmap, signaling that the original vision of many competing chains may have been misguided. The economics don't work. Without network effects and user concentration, smaller chains struggle to justify their operational costs.
The Pivot to Specialization
Some networks are adapting. Several major projects have shifted away from marketing themselves as general-purpose blockchains and toward more focused applications in payments, stablecoins and tokenized assets. This narrower positioning reflects a hard lesson: dominance in DeFi and general computing requires scale that only a handful of chains can achieve.
Alice Hou, a former research analyst at Messari, sees consolidation as inevitable. "I think only a few L2s with clear financial demand will be able to sustain themselves over time," she said. The data backs her up. Ethereum's Dencun upgrade, introduced in 2024, dramatically reduced the cost of posting rollup data to Ethereum through blobs, which should have leveled the playing field for smaller chains. Instead, it accelerated consolidation by making it cheaper for users to stick with the leaders.
