WHAT IS ACROSS PROTOCOL

Across protocol is a novel bridging method that combines an optimistic oracle, bonded relayers and single-sided liquidity pools to provide decentralized instant transactions from rollup chains to Ethereum mainnet

Across protocol is the fastest, cheapest, and most secure L2 to L1 bridge asset in the world right now.

Across uses UMA’s Optimistic Oracle to insure transactions.

Across protocol makes it possible to bridge USDC, ETH, and UMA from Arbitrum back to L1 Ethereum.

Across is used to quickly transfer tokens from an L2 to Ethereum rather than waiting for the L2's slower native settlement to complete. This is accomplished by utilizing Across liquidity pools to facilitate transfers and requiring users to pay a fee to liquidity providers for using their capital.

LIQUIDITY PROVISION OPTION

When a user bridges a particular token from L2 to L1, they are receiving immediate liquidity on L1 while the liquidity providers must wait for the slow native bridge to move the token from L2 to L1. For this service, liquidity providers are paid a fee for each transfer, effectively an interest rate on a short-term loan. When providing liquidity to a pool, a token is provided to the liquidity provider which represents their share of the pool. This share becomes more valuable over time as it accrues fees from transfers. The liquidity provider can withdraw their position at any time, provided there is enough liquidity in the pool. While the amount a liquidity provider withdraws from the pool will always be equal to or greater than what they put in, it's possible a liquidity provider may need to wait until tokens from the L2 are transferred into the pool on Ethereum through the L2’s native bridge to withdraw their funds.