Best Ethereum Layer 2s in 2026: Arbitrum, Optimism, Base, zkSync compared

Ethereum's top Layer 2 rollups compared — Arbitrum, Optimism, Base, zkSync, Starknet. TVL, fees, security models, and which to use.

By Eric Nkando, senior writer · 2 min read · Updated 14 Sep 2026

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The top Ethereum Layer 2 rollups in 2026 are Arbitrum, Optimism, Base, zkSync, and Starknet. Arbitrum leads on total value locked; Base leads on user activity (Coinbase distribution); Optimism has the OP Stack ecosystem. Zero-knowledge rollups (zkSync, Starknet) are gaining share but remain smaller than optimistic rollups.

Comparison at a glance

L2	Type	TVL rank	Notable	Best for
Arbitrum	Optimistic	#1	Broadest DeFi ecosystem	Active DeFi users
Base	Optimistic (OP Stack)	#2	Built by Coinbase, deep US retail adoption	Consumer apps, US users
Optimism	Optimistic	#3	OP Stack governance, Superchain	Multi-chain deployments
zkSync Era	Zero-knowledge	#4	Type 2 zkEVM, native account abstraction	UX-forward apps
Starknet	Zero-knowledge	#5	Cairo language, non-EVM	Bespoke performance

Which to use, by use case

Casual DeFi user. Arbitrum or Base. Both have deep liquidity, mature DEXs (Uniswap V3, Aerodrome), and cheap fees. Base is easier to fund from Coinbase.

Serious DeFi trader. Arbitrum. Broadest set of protocols, best liquidity depth, mature MEV protection.

Consumer app builder. Base. Coinbase distribution is real. Warpcast/Farcaster integration too.

Cheapest possible fees. zkSync Era or Base. Sub-cent for simple transfers.

Onboarding non-crypto users. Base with a smart-wallet frontend (account abstraction). Removes seed phrase friction.

What's actually shared vs different

Shared: All these L2s post transaction data or proofs back to Ethereum mainnet, which provides base-layer security. All support EVM-compatible smart contracts (except Starknet, which uses Cairo).

Different:

Withdrawal time to L1: Optimistic rollups default to ~7 days; ZK rollups are faster.
Sequencer decentralization: All L2s currently have centralized sequencers with plans to decentralize. Progress varies.
Native token: Arbitrum (ARB), Optimism (OP), zkSync (ZK), Starknet (STRK) have native tokens; Base does not (uses ETH for gas).
Governance: Arbitrum has DAO governance; Base has none currently; Optimism has OP Stack governance.

Frequently asked questions

What is an Ethereum Layer 2?

A Layer 2 (L2) is a blockchain built on top of Ethereum that inherits Ethereum's security while offering cheaper and faster transactions. Most L2s are rollups — they execute transactions off Ethereum, batch them, and post proofs back to Ethereum mainnet.

Optimistic vs zero-knowledge rollups — which is better?

Optimistic rollups (Arbitrum, Optimism, Base) assume transactions are valid and allow challenges — cheaper to run, but withdrawals to L1 take ~7 days by default. Zero-knowledge rollups (zkSync, Starknet) use cryptographic proofs — more expensive to run but withdrawals to L1 are faster and finality is stronger. Both are legitimate approaches.

Do I need to use Layer 2s?

For anything that isn't a large treasury movement, yes — L2 fees are 10-100× lower than Ethereum mainnet. Most active DeFi users have migrated most activity to L2s. Ethereum mainnet remains the settlement layer.