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l2s

Compares Ethereum Layer 2 networks and guides chain selection, deployment, and bridging.

Updated Sep 9, 2026
Search Tags:#rollup#ethereum#bridging#base#arbitrum#layer 2#chain selection
One-click install
npx skills add https://github.com/m-faran/genie-markets --skill l2s-m-faran
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: l2s
Source: https://github.com/m-faran/genie-markets/tree/main/.agent/skills/ethskills/l2s
Command: npx skills add https://github.com/m-faran/genie-markets --skill l2s-m-faran

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve? Choosing the wrong Ethereum Layer 2 wastes money, breaks deployments, and locks users into 7-day withdrawal delays. This Skill provides current, corrected knowledge about Arbitrum, Base, Optimism, Unichain, Celo, Robinhood Chain, zkSync, Scroll, and Linea so you pick the right chain and avoid common LLM misconceptions. ## Core Features & Use Cases - L2 Comparison and Selection: Compares transaction costs, block times, finality, chain IDs, and dominant DEXs across major L2s, with a need-based selection guide (consumer apps, DeFi liquidity, MEV protection, gasless UX). - Deployment Gotchas: Documents chain-specific pitfalls such as Arbitrum's L1-based block.number, zkSync's zksolc compiler requirement, Unichain's time-based ordering, and CREATE2 multi-chain deployment. - Bridging Guidance: Lists official bridges with transfer times plus fast-bridge alternatives like Across, Hop, and Stargate. - Use Case: You are deploying a consumer dApp and need to decide between Base and Arbitrum. The Skill tells you Base offers the cheapest gas and Coinbase on-ramp, while Arbitrum has deeper DeFi liquidity, and gives you the RPC, explorer, and bridge URLs for either. ## Quick Start Ask which Ethereum L2 to deploy your application on given your requirements for cost, finality, and ecosystem.

Frequently Asked Questions about l2s

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I choose which Ethereum L2 to deploy on?▼

Match the chain to your use case: Base for consumer apps and cheapest gas, Arbitrum for deepest DeFi liquidity, zkSync for native account abstraction, Unichain for MEV protection, and ZK rollups when you need to avoid the 7-day optimistic withdrawal delay.

Arbitrum vs Base: which is better for my dApp?▼

Base is roughly 50% cheaper than Arbitrum and offers direct Coinbase on-ramp, making it better for consumer and social apps. Arbitrum has deeper DeFi liquidity with GMX, Pendle, and Camelot, making it better for yield and trading protocols.

How long does bridging from an L2 to Ethereum mainnet take?▼

Official optimistic rollup bridges (Arbitrum, Base, Optimism, Unichain) take about 7 days for L2-to-L1 withdrawals due to the fraud-proof window. ZK rollups like zkSync and Scroll finalize in 15-120 minutes, and fast bridges like Across complete in 30 seconds to 2 minutes.

Is Celo still a Layer 1 blockchain?▼

No. Celo migrated from an independent L1 to an OP Stack Layer 2 on Ethereum on March 26, 2025 at block 31056500. It now focuses on mobile-first payments with sub-cent fees and the MiniPay wallet.

What deployment gotchas exist on Arbitrum and zkSync?▼

On Arbitrum, block.number returns the L1 block number, so use block.timestamp for time logic. On zkSync Era you must compile with zksolc, EXTCODECOPY is unavailable, and non-inlinable libraries must be pre-deployed.

Should I still build on Polygon zkEVM?▼

No. Polygon announced in June 2025 that zkEVM is being discontinued. Polygon is refocusing on its PoS chain for payments, stablecoins, and RWAs plus AggLayer for cross-chain interoperability.

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