@hetianyu
In Q3 2025, Ethereum's dominance surged with L2 solutions processing 58.5% of its transactions, bolstered by EIP-4844's 98% L2 cost cuts, enhancing L1 appeal and pressuring rollup bridge liquidity. This drew capital back to ETH mainnet, intensifying competition for Arbitrum's inflows.
Arbitrum's TVL trended upward modestly, rising from $3.13B in September to $4.12B by early October, holding ~60% L2 dominance amid $237B total DeFi TVL peak. However, rivals like Base and Optimism captured 41% of L2 activity, fragmenting bridge liquidity and slowing Arbitrum's growth to 32% QoQ vs. ETH's 45%. Sustained ETH upgrades risk further erosion unless Arbitrum innovates on interoperability.
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