Layer 2 (L2) solutions are protocols built on top of existing blockchains (Layer 1s) to improve transaction speed and reduce costs while inheriting the security of the underlying chain.
Why Layer 2?
Ethereum can process about 15 transactions per second. During high demand, fees can spike to $50-$100+ per transaction. Layer 2s process transactions off the main chain and periodically settle them back, achieving thousands of TPS at pennies per transaction.
Types of Layer 2 Solutions
- Optimistic Rollups: Assume transactions are valid unless challenged. Examples: Arbitrum, Optimism, Base.
- ZK Rollups: Use zero-knowledge proofs to verify transactions mathematically. Examples: zkSync, StarkNet, Scroll.
- Sidechains: Separate chains with their own consensus. Example: Polygon PoS.
Top Layer 2 Networks
- Arbitrum: Largest L2 by TVL, home to GMX, Camelot, and major DeFi protocols
- Base: Built by Coinbase, rapidly growing ecosystem
- Optimism: Powers the OP Stack used by Base and other chains
- zkSync: Leading ZK rollup with native account abstraction
The Superchain Vision
Optimism's Superchain concept envisions a network of interconnected L2 chains sharing security and communication layers. Base, Zora, and Mode are all part of this ecosystem.
Track L2 Activity
CoinMarketGuy tracks L2 tokens and whale activity across all major Layer 2 networks. See where smart money is deploying capital across the scaling ecosystem.