Across Protocol
AuditedVerifiedBattle-testedWinding DownAcross is an intent-based cross-chain bridge using UMA's Optimistic Oracle, bonded relayers and single-sided liquidity pools to settle transfers across 30+ EVM and non-EVM chains in ~2 seconds.
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Score history
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The Problem
Cross-chain bridges typically rely on multisigs, lock-and-mint wrapped assets, or slow finality, exposing users to either custody risk, illiquid wrapped tokens, or 7-day exit delays.
The Solution
Across uses bonded relayers to front native assets on the destination chain in seconds, with UMA's Optimistic Oracle settling claims trustlessly — no multisig signers control user funds in transit and no wrapped tokens are minted.
Why it Matters
First production-scale intent-based bridge: single-sided LP model on Ethereum + permissionless relayer competition delivers ~2-second fills with no liquidity fragmentation across chains.
Protocol Metrics
Related Research
View allFrequently asked questions about Across Protocol
What is Across Protocol?+
Across Protocol is a Bridge protocol operating on Ethereum, Arbitrum, Optimism, Base, Polygon, Solana, zkSync Era, Linea, Mode, Blast, World Chain, Lisk, Scroll, BSC. Across is an intent-based cross-chain bridge using UMA's Optimistic Oracle, bonded relayers and single-sided liquidity pools to settle transfers across 30+ EVM and non-EVM chains in ~2 seconds.
How does Across Protocol work?+
Across uses bonded relayers to front native assets on the destination chain in seconds, with UMA's Optimistic Oracle settling claims trustlessly — no multisig signers control user funds in transit and no wrapped tokens are minted.
Is Across Protocol safe?+
DeFi Sentinel rates Across Protocol A with a safety score of 72/100, indicating low-to-moderate risk. The score reflects five risk dimensions: smart contract & technical risk, economic design & market risk, governance & centralization, sustainability & competitive position, and reputation & social trust. Across Protocol has 2 audits on record. DeFi Sentinel's analysis flagged 3 high, 4 medium, 3 low risk alerts across Smart Contract & Technical Risk, Economic Design & Market Risk, Governance & Centralization, Sustainability & Competitive Position and Reputation & Social Trust. As with all DeFi protocols, residual risk remains and users should review the full risk breakdown before depositing.
What is the safety score of Across Protocol?+
Across Protocol has a DeFi Sentinel safety score of 72/100 (rating A), last updated October 13, 2026. The score is computed across smart contract & technical risk (30%), economic design & market risk (25%), governance & centralization (20%), sustainability & competitive position (15%), and reputation & social trust (10%).
Which chains does Across Protocol support?+
Across Protocol is deployed on Ethereum, Arbitrum, Optimism, Base, Polygon, Solana, zkSync Era, Linea, Mode, Blast, World Chain, Lisk, Scroll, BSC.
Has Across Protocol been audited?+
Yes. Across Protocol has 2 audit reports on record from firms including OpenZeppelin, OpenZeppelin. Audit reports and dates are linked under the Resources tab on this page.