Layer 2

An Ethereum Layer 2 incubated by the US exchange Coinbase and built on the OP Stack. It is currently the Layer 2 with the most money and trading, and its sequencer is run by Coinbase alone.

An Optimistic Rollup developed by Offchain Labs, live since 2021, with the ARB token governed by a DAO. One of the fastest Ethereum Layer 2s and a long-standing home for DeFi and perpetuals trading.

OP Mainnet itself is small, but its open-source OP Stack has been adopted by Base and many other chains, which together form the "Superchain". The OP token governs the whole Superchain.

A ZK Rollup developed by Matter Labs. Every batch of transactions comes with a zero-knowledge proof that Ethereum verifies, so withdrawals do not wait for a challenge period. Big technical ambitions, but very little money on the chain so far.

A ZK Rollup launched by Ethereum developer Consensys (MetaMask's parent company), built to match Ethereum as closely as possible. Its token launched in 2025, and fees are used to burn both ETH and LINEA.

A ZK Rollup aiming for bytecode-level compatibility with Ethereum, working closely with Ethereum Foundation researchers. Its technology is well regarded, but there is now very little money or activity on the chain.

An Ethereum Layer 2 launched by the founder of the NFT marketplace Blur, selling ETH and stablecoin balances that earn yield automatically. It drew in billions of dollars before launch; today very little money remains, and L2BEAT does not count it as a rollup.