Across Protocol Bridge
Intent-based cross-chain bridge where relayers fill transfers and are repaid later from pooled liquidity.
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Across key facts
| Category | Cross-chain bridge |
|---|---|
| Chains | Ethereum, Arbitrum, Base, BNB Chain and other EVM chains |
| Platforms | Web, API |
| Custody | Non-custodial |
| Fees | LP fee plus relayer fee, taken as the gap between input and output amount |
| Chains | 24 chains |
| Security audits | OpenZeppelin |
| Company | Interface operated by Risk Labs |
| US availability | Available: terms restrict only sanctioned jurisdictions |
What is Across?
Across is a cross-chain bridge in which relayers front funds on the destination chain and are repaid from liquidity pools. Its docs list support for 24 chains. The fee is the gap between the amount deposited and the amount received, split into an LP fee and a relayer fee.
How Across works
A transfer starts when your wallet calls depositV3() on the SpokePool contract of the origin chain.
The call names the destination chain, output token, output amount, recipient and a fill deadline. Your tokens are pulled into the SpokePool and held in escrow, and the contract emits a V3FundsDeposited event that relayers watch for.
A relayer then calls fillV3Relay() on the destination SpokePool and pays you from its own tokens. Each intent can be filled only once, and some intents give one relayer an exclusivity window before any relayer may fill. The relayer also names the chain where it wants repayment, which changes the LP fee. The docs quote fills of about 2 seconds on mainnet.
Repayment happens later and you do not wait for it. A Dataworker groups all fills from a window of about 1.5 hours, checks each fill against its deposit, and proposes a Merkle root to the HubPool on Ethereum with a bond. After a challenge period with no dispute, relayers are repaid on the chain they chose and pools are rebalanced through canonical bridges.
How to start with Across
- To bridge by hand, open app.across.to with a self-custody EVM wallet that holds the token you want to move and a little native gas on the origin chain.
- You pick origin and destination chains, approve the token if asked, and send one deposit transaction.
- Developers use the Swap API instead: GET /swap/approval returns approval and swap calldata, and production use needs an API key and Integrator ID.
- The terms of service are from Risk Labs, dated October 22, 2025.
- They require you to be of legal age (18 in the United States) and bar sanctioned persons and residents of comprehensively sanctioned territories.
- Using a VPN to get around those limits is prohibited, and you must be allowed to use the products where you live.
Across fees and limits
Your total fee is the input amount minus the output amount. Part goes to liquidity providers as an LP fee set by an Aave-style two-slope curve on pool utilization, with rate parameters that differ by token and route. The LP fee is zero when the relayer takes repayment on the origin chain, because no cross-chain rebalancing is needed. The rest is the relayer fee, which covers destination gas, the relayer's capital cost while it waits for repayment, and risk. The docs note that filling on Ethereum mainnet costs more gas than filling on Arbitrum or Base. You also pay origin-chain gas for the deposit and any approval.
Risks to know before using Across
- Deposits are escrowed in SpokePool contracts until the intent is filled and settled.
- Across lists audits of V2, V3, an incremental V3 review and its token distributor, plus UMA audits of the Optimistic Oracle that secures settlement.
- The safety of repayments rests on that oracle: a bad bundle has to be disputed during the challenge period, so the model assumes at least one honest watcher.
- The terms state that Risk Labs does not control or operate any version of the protocol and runs no liquidity pools.
- They include a binding arbitration clause and a class action waiver, which limits how a US user can bring a claim.
- Features powered by outside providers in the app come with those providers' own terms, and Risk Labs disclaims responsibility for them.
Across usage
From DefiLlama (TVL) (fees users paid), updated Nov 10, 2026.
Across alternatives
Other projects people compare with Across.
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Where Across ranks on DappAtlas
Listed next to Across
- Portal Bridge (Wormhole) Cross-chain bridge
- Arbitrum Layer 2 network
Across pros and cons
- Supports 24 chains per its docs
- Contracts audited by OpenZeppelin
- Bug bounty pays up to $1,000,000 for critical issues
- LP fee rises steeply once pool utilization passes its kink
- Blast support scheduled for removal on July 20, 2026
- Mostly EVM chains
Across FAQ
What is Across?
Across is a cross-chain bridge in which relayers front funds on the destination chain and are repaid from liquidity pools. Its docs list support for 24 chains. The fee is the gap between the amount deposited and the amount received, split into an LP fee and a relayer fee.
How much value is locked in Across?
$15M according to DefiLlama on Nov 10, 2026. It is deployed on 1 chain: Ethereum.
How much does Across cost?
LP fee plus relayer fee, taken as the gap between input and output amount, according to Across’s own page (checked Sep 26, 2026).
How much do users pay Across in fees?
$100,019 over the last 30 days, according to DefiLlama on Nov 10, 2026.
Is Across available in the US?
Available: terms restrict only sanctioned jurisdictions, according to Across’s own page (checked Sep 26, 2026).
Does Across hold my funds?
No. Across is non-custodial: you keep your funds in your own wallet and sign each transaction.
Sources
How this page works
Sources: Across: official site, Across: Fees in the System, Across: Welcome to Across. Data as of Sep 26, 2026.
Not affiliated with any project listed. Educational content, not financial advice.