ethereum/l2-comparison
Layer 2 Technology Comparison: Arbitrum vs Optimism vs Base vs zkSync
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v1.0.0·Updated 3/20/2026
One-Line Positioning
| L2 | Positioning | Technology | Ecosystem |
|---|---|---|---|
| Arbitrum One | Largest TVL, DeFi hub | Optimistic Rollup (Nitro) | Mature, most protocols |
| Optimism | OP Stack standard, RPGF incentives | Optimistic Rollup | Public goods ecosystem |
| Base | Coinbase-backed, consumer apps | OP Stack (Optimism fork) | Fastest growth |
| zkSync Era | Leading ZK tech, native AA | ZK Rollup (zkEVM) | ZK ecosystem frontier |
| Linea | ConsenSys product, zkEVM | ZK Rollup | Enterprise backing |
| Scroll | Closest to EVM zkEVM | ZK Rollup | Research-oriented |
| Polygon zkEVM | Polygon ecosystem ZK direction | ZK Rollup | Polygon ecosystem |
Technical Dimension Comparison
Optimistic vs ZK Rollup
| Dimension | Optimistic | ZK Rollup |
|---|---|---|
| Withdrawal to L1 Time | 7 days (challenge period) | Minutes (after proof generation) |
| Gas Cost | Lower | Slightly higher (proof generation cost) |
| EVM Compatibility | Fully compatible | Near-complete (minor differences remain) |
| Technical Maturity | Mature | Rapidly developing |
| Suitable Scenarios | DeFi, general dApps | High-frequency trading, privacy, AA |
Key Metrics Comparison (2024 Q4)
| L2 | TVL | Daily Transactions | Gas (ETH transfer) |
|---|---|---|---|
| Arbitrum | ~$15B | ~1M | ~$0.01 |
| Base | ~$10B | ~2M | ~$0.01 |
| Optimism | ~$7B | ~500K | ~$0.01 |
| zkSync Era | ~$3B | ~400K | ~$0.02 |
Chain Selection Decision Tree
What type is your project?
│
├─ DeFi protocol (needs maximum liquidity)
│ → Arbitrum One (highest TVL, most DeFi integrations)
│
├─ Consumer application (social/gaming/NFT)
│ → Base (Coinbase user base, Onchain Summer ecosystem)
│
├─ Requires ZK features (privacy/AA/high-frequency trading)
│ → zkSync Era (native AA, most mature ZK ecosystem)
│
├─ Public goods/open source project (needs grants)
│ → Optimism (RPGF incentivizes public goods contributors)
│
└─ Multi-chain deployment (want to reach more users)
→ Arbitrum + Base + Optimism (OP Stack homogeneous, high code reusability)
OP Stack Ecosystem (Important)
Optimism, Base, Zora, Mode, Redstone, etc. are all built on OP Stack, forming the Superchain:
- Code reusability: Contracts deployed on Optimism can migrate to Base with near-zero cost
- Unified bridging: Standardized inter-chain communication within Superchain (under construction)
- Shared sequencer: Planned for the future
# OP Stack chain contract deployment — same codebase
forge script Deploy.s.sol --rpc-url $OP_RPC --broadcast # Optimism
forge script Deploy.s.sol --rpc-url $BASE_RPC --broadcast # Base (nearly identical)
Arbitrum Stylus (New Feature)
Arbitrum supports writing contracts in Rust/C++ (compiled to WASM), with 10x lower gas than Solidity:
// Writing Arbitrum contracts in Rust
#[entrypoint]
fn user_main(input: Vec<u8>) -> Result<Vec<u8>, Vec<u8>> {
// Processing logic
}
Cross-L2 Bridging Tools
| Tool | Supported Chains | Features |
|---|---|---|
| Across | Major L2s | Fastest (minutes), low fees |
| Stargate | Multi-chain | LayerZero technology, deep liquidity |
| Official bridges | Native to each chain | Most secure, but slow (7 days/minutes) |
| Hop Protocol | OP ecosystem | Focused on OP Stack inter-chain |