Echo Protocol is a decentralized finance (DeFi) platform focused on bridging, restaking, and BTC liquidity solutions. It operates within the Move ecosystem, offering products like aBTC, a cross-chain liquid Bitcoin token, and eAPT, enabling restaking for MoveVM chains. Echo integrates BTC with native Layer 2 solutions and facilitates DeFi interoperability, enhancing yield opportunities across ecosystems like Aptos.