What problem does it solve? Choosing the wrong Ethereum Layer 2 wastes money on gas, locks funds in 7-day withdrawal windows, or strands you on a deprecated chain. This Skill provides current, corrected data on L2 costs, finality, ecosystems, and deployment differences so you pick the right chain the first time. ## Core Features & Use Cases - L2 Comparison & Selection: Side-by-side tables of transaction costs, block times, finality, and chain IDs for Arbitrum, Base, Optimism, Unichain, Celo, zkSync, Scroll, and Linea, plus a need-based selection guide. - Deployment Gotchas: Chain-specific warnings such as zkSync's zksolc compiler requirement, Arbitrum's L1 block.number behavior, and Unichain's time-based transaction ordering. - Bridging & Multi-Chain Strategy: Official and fast bridge options with fee/time tradeoffs, plus CREATE2 patterns for same-address deployments across chains. - Use Case: You are launching a consumer app and ask which chain to use. The Skill recommends Base for Coinbase on-ramp and low fees, warns that Polygon zkEVM is being discontinued, and gives you the RPC, explorer, and bridge URLs to start. ## Quick Start Ask which Ethereum Layer 2 to deploy your app on given your target users and budget.
