Ethereum Layer 2 Solutions Explained (2026): Arbitrum, Optimism, Base, zkSync
Related guides: What is Arbitrum? The Complete Guide (2026) What is Polygon (POL)? Complete Guide (2026) How to Add Arbitrum to MetaMask How to Add Optimism to MetaMask HodlGuide Editorial TeamThe HodlGuide editorial team researches and tests crypto wallets and exchanges, documenting setup flows, fees and security practices so readers can choose the right tool […]
How to Add Optimism (OP) to MetaMask (2026)
What Is Optimism? Optimism is an Ethereum Layer 2 network that uses Optimistic Rollup technology — it batches transactions off-chain and periodically submits compressed proofs to Ethereum mainnet. Like Arbitrum, it inherits Ethereum’s security while dramatically reducing transaction costs. Optimism is also the foundation of the Superchain — a growing collection of OP Stack chains […]