Ethereum Layer 2 networks (L2s) are chains that run on top of Ethereum — inheriting its security but processing transactions much faster and cheaper. Fees: $0.001-0.01 vs $0.45 on mainnet. Speed: seconds vs minutes. In 2026, Arbitrum leads in DeFi TVL, Base leads in retail users, and zkSync leads in technical innovation.
Why Layer 2 Exists
Ethereum mainnet processes ~45 transactions per second. Millions of users want to use Ethereum for DeFi, NFTs, payments, and gaming. At peak demand, mainnet fees have hit $50-200 per transaction — prohibitively expensive for small transactions. Layer 2 solves this by bundling thousands of transactions together, processing them off-chain, and posting a compressed summary to Ethereum mainnet. You get Ethereum's security at L2's speed and price.
Top L2 Networks — April 2026 Comparison
| L2 Network | TVL | Avg Fee | TPS | Technology | Best For |
|---|---|---|---|---|---|
| Arbitrum One | $18B | $0.01 | 4,000 | Optimistic rollup | DeFi, GMX, Uniswap |
| Base (Coinbase) | $8B | $0.005 | 3,000 | Optimistic rollup (OP Stack) | Consumer apps, Coinbase users |
| Optimism | $6B | $0.008 | 2,000 | Optimistic rollup | DeFi, Synthetix ecosystem |
| zkSync Era | $3B | $0.003 | 3,500 | ZK rollup | Privacy, technical users |
| Scroll | $1.5B | $0.003 | 2,000 | ZK rollup | EVM compatibility |
Arbitrum — The DeFi Leader
Arbitrum has the most DeFi protocols, the highest TVL, and the most established ecosystem. Major protocols live here: GMX (perpetual futures), Uniswap, Aave, Curve, Radiant Capital, Camelot DEX. For DeFi power users, Arbitrum is the default L2 in 2026. The ARB governance token is held by Arbitrum DAO members who vote on protocol parameters.
Base — The Coinbase Effect
Base is Coinbase's L2, built on Optimism's OP Stack. Coinbase's 110 million verified users provide a massive potential user base. Base has the fastest-growing number of daily active users of any L2 in 2026 — driven by consumer apps, the Farcaster social network ecosystem, and easy onboarding from Coinbase. No native token (no ARB-equivalent) — some users prefer this as it means no token emissions diluting rewards.
Ethereum L2 — FAQ
Layer 2 questions answered