Hop

Hop (hop.exchange) is a cryptocurrency bridging protocol that enables users to transfer tokens between Ethereum and layer-2 scaling solutions. Its documentation frames the product against the broader bridge landscape, in which most bridges depend on off-chain actors such as multisigs or oracles to attest that a transfer occurred on the source chain, creating an off-chain attack surface; the docs note that more than $3 billion of capital locked in bridges was hacked in 2022, mostly through key compromises.

Architecturally, Hop compresses origin messages (transfers) into "Bundles" and relays them between chains using the underlying networks' native message bridges. The design is described as a hub-and-spoke model in which Ethereum is the hub and each scaling solution is a spoke: a transfer between Optimism and Arbitrum, for example, is routed down to Ethereum through Optimism's native bridge and then up to Arbitrum through Arbitrum's native bridge, so that the validity of a transfer can be proven on-chain. Because native message bridges impose exit delays — roughly 40 minutes for Polygon PoS and Gnosis Chain, and up to seven days for optimistic rollups — Hop relies on participants called Bonders, who verify transactions off-chain and front liquidity to users on the destination chain, absorbing the liquidity lock-up until the on-chain proof (the Bundle) arrives.

Beyond asset bridging, Hop's documentation describes an intended expansion of its Core Messenger into other interoperability use cases including cross-chain governance, NFT bridging and omnichain tokens. Public documentation also covers a Hop DAO with governance, voting and delegate processes, liquidity mining, token distribution, and protocol fees directed to public goods funding.

Business model

Hop operates as an on-chain protocol: users pay fees to bridge assets, liquidity providers supply capital to bridge pools in exchange for rewards, and Bonders front destination-chain liquidity for transfers and are repaid when the on-chain proof settles. Documentation references protocol fees and public good funding, liquidity mining and a token distribution administered through the Hop DAO.

Latest developments

The reviewed documentation page was last updated approximately three years before retrieval, and the docs site lists sections covering governance, liquidity mining, token distribution, protocol fees and public goods funding, a roadmap, and statistics dashboards. No dated recent developments are documented in the available sources.