Across Protocol is a cross-chain bridge optimized for instant, capital-efficient transfers, while Synapse is a universal network for cross-chain liquidity and communication. Across focuses on speed and low capital requirements, making it ideal for users who need fast token transfers. Synapse offers broader interoperability, including cross-chain messaging, making it better suited for developers and complex multi-chain applications.
| Token Price | — | — |
| 24h Change | — | — |
| Market Cap | — | — |
| TVL | $19.5MDefiLlama | $11.9MDefiLlama |
| MCap Rank | #647 | #450 |
| Total Raised | $51.0M | $2.0M |
| Founded | 2021 | 2025 |
| Stage | — | — |
| X / Twitter | 105K | 72K |
| GitHub Stars | 143 | — |
| Chains | arbitrumbaseboba | arbitrumauroraavalanche |
| Tags | Bridge, Infra, Polygon Ecosystem | Bridge, Infra, AI |
Across is an optimistic cross-chain bridge that uses UMA's optimistic oracle and bonded relayers to enable fast, capital-efficient transfers between rollup chains and Ethereum mainnet. It features a single liquidity pool, competitive relayer landscape, and no-slippage fee model.
Synapse is a cross-chain protocol that enables frictionless interoperability between blockchains, allowing users to bridge and swap assets, provide liquidity, and send generalized messages across L1s, sidechains, and L2s. It powers decentralized, permissionless transactions and supports new cross-chain primitives.