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Read through some of our most common FAQs.
Across is a cross-chain bridge for L2s and rollups secured by UMA's optimistic oracle. It is optimized for capital efficiency with a single liquidity pool, a competitive relayer landscape, and a no-slippage fee model.
Designed by the engineers who built UMA, Across was the result of approaching bridging not only as a technical concern but as a financial engineering concern.
Across' bridging speed depends on the number of relayers and the speed at which they are relaying.
The typical transfer occurs within 1-4 minutes. This occurs when relayers have sufficient assets on the destination chain. If relayers have insufficient assets on the destination chain, but have excess assets on Mainnet, they will be sent to destination to complete the relay. This process can take 10-30 minutes for the user transaction to complete. If there are not enough assets on the destination chain plus Mainnet, the transfer will be slow relayed which can take 2-4 hours. All of this will be communicated upfront for users in the 'time to destination' field. If you have not received your funds within the quoted 'time to destination' value, please reach out to Dev Support in the Across Discord.
Across currently supports Ethereum mainnet, Arbitrum, Boba, Optimism, and Polygon.
Across currently supports bridging ACX, ETH, WETH, WBTC, USDC, DAI, BAL, BOBA, and UMA.
A liquidity provider (LP) is someone that provides liquidity to one of the Across pools. This liquidity is used to reimburse relayers after the relay has been verified by the optimistic oracle.
Provided there is enough liquidity in the pool, a liquidity provider can withdraw their position at any time.
A relayer enables users to make instantaneous transfers between chains by providing the capital upfront. In return for providing this service, they are able to collect fees from the users.
The snapshot for early users was taken on July 19th, 2022 at midnight UTC (i.e. no transfers on the 19th are included).
The snapshot for the Bridge Traveler program was taken on September 1st, 2022 at midnight UTC (i.e. no transfers in September are included.)
The snapshot for liquidity provider airdrop eligibility was taken on November 22nd, 2022 at midnight UTC. LPs could earn ACX for the airdrop by being an LP up to this date.
Risk Labs is a foundation that supports the UMA protocol, which is the optimistic oracle that secures Across.
The Risk Labs foundation supports a team working on Across, full-time. Risk Labs will work alongside the DAO to iterate on the design of the bridge and drive adoption.