Overview The AcrossFacet enables cross-chain token transfers using the Across Protocol. Across is a cross-chain bridge optimized for capital efficiency and fast transfers.
Contract Interface Functions startBridgeTokensViaAcross Bridges tokens to another chain using Across Protocol.
function startBridgeTokensViaAcross ( BridgeData _bridgeData , AcrossData _acrossData ) external payable
Standard bridge data containing transaction details Unique transaction identifier
Token address on source chain
Recipient address on destination chain
Minimum amount to receive
Whether source swaps are included
Whether destination call is included
Across-specific bridging parameters Quote timestamp from Across API
swapAndStartBridgeTokensViaAcross Performs a token swap on the source chain before bridging via Across.
function swapAndStartBridgeTokensViaAcross ( BridgeData _bridgeData , SwapData [] _swapData , AcrossData _acrossData ) external payable
Array of swap operations to execute before bridging Address to approve tokens to
Whether deposit is required
Across-specific parameters
Data Structures AcrossData struct AcrossData { int64 relayerFeePct ; // Relayer fee as percentage uint32 quoteTimestamp ; // Quote timestamp bytes message ; // Optional message uint256 maxCount ; // Maximum relay count }
Usage Example import { AcrossFacet } from '@lifi/contract-types' ; const acrossFacet = AcrossFacet__factory . connect ( facetAddress , signer ); const bridgeData = { transactionId: '0x...' , bridge: 'across' , integrator: 'my-dapp' , referrer: '0x0000000000000000000000000000000000000000' , sendingAssetId: '0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48' , // USDC receiver: '0x...' , minAmount: ethers . utils . parseUnits ( '100' , 6 ), destinationChainId: 10 , // Optimism hasSourceSwaps: false , hasDestinationCall: false }; const acrossData = { relayerFeePct: ethers . BigNumber . from ( '5000' ), // 0.5% quoteTimestamp: Math . floor ( Date . now () / 1000 ), message: '0x' , maxCount: ethers . BigNumber . from ( '1' ) }; const tx = await acrossFacet . startBridgeTokensViaAcross ( bridgeData , acrossData , { value: 0 } ); await tx . wait ();
Events The facet emits standard LiFi events:
LiFiTransferStarted(BridgeData bridgeData)LiFiTransferCompletedAssetSwapped (when using swapAndStart variant)
See Also