Across is an optimistic insured bridge that relies on a decentralized group of relayers to fulfill user deposit requests from EVM to EVM networks. Relayer funds are insured by liquidity providers in a single pool on Ethereum and refunds are processed via the UMA Optimistic Oracle. Across allows users to move tokens instantly and cheaply between EVM networks by borrowing liquidity from a decentralized network of relayers who are reimbursed on a chain of their choosing from a single liquidity pool on Ethereum Mainnet.