Ethereum L2 consolidation leaves only 2 networks controlling 80% of DeFi TVL

Ethereum layer-2 activity is consolidating rapidly, with Base and Arbitrum now controlling more than 80% of L2 DeFi total value locked, DefiLlama data shows.

"The thing to recognize is that anywhere where somebody would be running a smart contract on an existing blockchain, someone could equally run a layer two," Ben Fisch, co-founder and CEO of Espresso Systems, said. "We're in a consolidation phase for general-purpose layer twos, not layer twos broadly."

The concentration follows a wave of closures and declining deposits across smaller networks. Zero Network shut down last month, joining a growing list of struggling rollups. Linea's bridge deposits fell more than 60% to $367 million in May from $976 million in November 2025, according to DefiLlama. Networks including World Chain, Starknet and Mantle have also seen declining deposits over the past six months.

The shakeout reflects a structural shift: launching a rollup has become cheaper — Ethereum's Dencun upgrade in 2024 slashed data availability costs via blobs — but attracting users has grown harder. "Without enough blockspace demand, user activity or developer traction, there is little reason to continue maintaining an L2," said Alice Hou, a former research analyst at Messari.

The economics of operating a layer-2 have improved dramatically. Data availability costs now represent only a small fraction of operator expenses for many OP Stack chains, according to Messari research. Yet lower costs have not solved the demand problem.

"From an operator perspective, it is definitely cheaper to run an L2 today," Hou said. "The real challenge is still generating enough sustained demand to make the network worth operating."

From Infrastructure to Applications

The response across the industry has been a pivot away from general-purpose chains toward application-specific use cases. Projects that once marketed themselves as general-purpose blockchains are increasingly focusing on payments, stablecoins and tokenized assets.

"People have realized that all the different general-purpose blockchains compete with each other," Fisch said. "If you want to succeed, you need to build out a differentiated application."

Traditional financial institutions may become some of the biggest beneficiaries. Asset managers launching tokenized money-market funds and stablecoin issuers have clear reasons to operate on a dedicated layer-2, offering lower costs and greater control than deploying directly as a smart contract.

That dynamic helps explain why exchanges remain among the strongest candidates. Coinbase's Base has leveraged the exchange's existing customer base while integrating users into Ethereum's broader DeFi ecosystem.

"The question should not be, 'Can this company launch an L2?'" Hou said. "It should be: 'Does this business already have enough distribution, financial activity and network effects to make an L2 meaningfully useful?'"

A Different Vision for Layer-2s

The debate also reflects a deeper disagreement about what layer-2s are for. For years, Ethereum advocates framed rollups primarily as a scaling solution. Fisch said he sees them differently.

"I don't view layer twos as scaling Ethereum," he said. "I view layer twos as leveraging the existing security properties of layer one."

In that framework, Ethereum functions less as a destination and more as a settlement layer that applications can use when it makes sense. If that trend continues, the winners could be a smaller number of networks tied to specific businesses, financial products and user communities — rather than hundreds of competing general-purpose chains.

This article is for informational purposes only and does not constitute investment advice.