Across Protocol is a cross-chain bridge optimized for speed and capital efficiency, enabling fast asset transfers between Ethereum and its Layer 2 networks including Arbitrum, Optimism, Base, Polygon, zkSync, and Linea. Across uses an intent-based architecture where relayers compete to fill user bridge orders, providing near-instant transfers rather than requiring users to wait for standard bridge finality periods. The protocol is secured by UMA's optimistic oracle for settlement verification. Across is known for having some of the lowest bridge fees and fastest transfer times in the ecosystem, making it popular among users who frequently move assets between Ethereum L2s.
Wormhole is a cross-chain messaging and bridging protocol that connects over 30 blockchains, enabling the transfer of assets and data between different networks. Originally built on Solana, Wormhole has expanded to support Ethereum, BNB Chain, Polygon, Avalanche, Arbitrum, Optimism, Sui, Aptos, and many other chains. The protocol uses a network of Guardian nodes that observe and validate cross-chain messages, with 19 validators securing the network. Wormhole supports various cross-chain use cases including token bridges, NFT transfers, cross-chain governance, and generalized message passing. It is one of the most widely adopted bridge protocols, securing billions in cross-chain transfers.