# Across

**Published by:** [antanta.eth](https://paragraph.com/@antanta/)
**Published on:** 2023-11-25
**URL:** https://paragraph.com/@antanta/across

## Content

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.Across is powered by a permissionless relayer ecosystem**.**Across uses third-party relayers that risk their own funds to bridge assets. These relayers can choose to move funds far faster than the origin or destination chain's finality times, allowing for “fast fills.” This means relayers can take calculated risks and compete with each other on speed to fill users' deposit requests.Across is optimistic.Across uses UMA’s optimistic oracle to confirm that transactions on all the chains are correct. If there is a transaction that is incorrect, it will be disputed and resolved by UMA tokenholders. It only requires a single honest actor to detect fraud.Across works smarter, not harder.Across checks if there are funds about to pass in opposite directions, and instead keeps them on the chain they are already on. Then, instead of waiting for arbitrageurs to fix price imbalances at the cost to the user, Across rebalances automatically every 4-8 hours. In short, Across is building the bridge Ethereum deserves.

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