Optimism vs Base vs Arbitrum: Which L2 for Swapping?

Arbitrum, Base, and Optimism are the three largest EVM-compatible Layer 2 networks, each with billions in TVL and millions of daily transactions. All three inherit Ethereum's security through rollup technology, but they differ in fees, ecosystem, and token availability.

Choosing the right L2 depends on your priorities: lowest fees (Base), deepest liquidity (Arbitrum), or OP Stack ecosystem benefits (Optimism). AEXI supports all three for same-chain and cross-chain swaps.

Base: $0.01–0.10 per swap — the cheapest of the three. Optimism: $0.02–0.15 per swap — slightly higher than Base. Arbitrum: $0.05–0.50 per swap — the highest of the three but still 95%+ cheaper than Ethereum mainnet.

All three are dramatically cheaper than Ethereum mainnet ($2–50+ per swap). For routine trading, the fee difference between L2s is negligible — the choice should be driven by token availability and liquidity depth.

Arbitrum has the widest token selection: ETH, USDC, USDT, WBTC, ARB, GMX, and hundreds of DeFi tokens. Deep liquidity on Camelot, Uniswap, SushiSwap. Best for: trading a wide variety of tokens, DeFi farming, and large swaps.

Base: strong ETH and USDC liquidity, growing DeFi ecosystem, native cbBTC (Coinbase Wrapped Bitcoin). Best for: stablecoin swaps, ETH trading, and BTC-to-ETH rotations. Optimism: ETH, USDC, OP,VELO, and growing selection. Best for: OP ecosystem participation and retroactive airdrops.

If your assets are on one L2 but you need tokens on another, AEXI handles cross-L2 swaps automatically. For example: swap USDC on Arbitrum → USDC on Base in a single transaction. The route may go through Ethereum mainnet or use a native L2 bridge.

Cross-L2 swaps are more expensive than same-L2 swaps (bridge fees apply) but still much cheaper than swapping on Ethereum mainnet. AEXI compares routes across bridge protocols to find the cheapest cross-L2 path.