Hyperbridge is a cross-chain protocol that uses cryptographic proofs to create a decentralized and permissionless network of relayers, enabling secure transmission of messages across blockchain networks. The relayers do not require whitelisting or staking and are incentivized by user fees for performing cross-chain operations. Acting as a cryptoeconomic coprocessor, Hyperbridge provides secure, verifiable interoperability using consensus and storage proofs. Developers can use on-chain and off-chain SDKs to send and read cross-chain messages, enhancing blockchain interoperability.