Overview The CelerCircleBridgeFacet enables USDC transfers across chains using Circle’s Cross-Chain Transfer Protocol (CCTP) through the Celer network. This provides native USDC transfers without wrapped tokens.
Contract Interface Constants CIRCLE_BRIDGE_PROXY Returns the address of the Circle bridge proxy contract.
function CIRCLE_BRIDGE_PROXY () external view returns ( address )
USDC Returns the address of the USDC token contract.
function USDC () external view returns ( address )
Configuration Functions initCelerCircleBridge Initializes the Celer Circle Bridge facet.
function initCelerCircleBridge () external
Bridging Functions startBridgeTokensViaCelerCircleBridge Bridges USDC to another chain using Circle’s CCTP.
function startBridgeTokensViaCelerCircleBridge ( BridgeData _bridgeData , CelerCircleData _celerCircleData ) external
Standard bridge data containing transaction details
Celer Circle-specific bridging parameters Show CelerCircleData fields
Minimum finality threshold
swapAndStartBridgeTokensViaCelerCircleBridge Performs a token swap on the source chain before bridging via Circle’s CCTP.
function swapAndStartBridgeTokensViaCelerCircleBridge ( BridgeData _bridgeData , SwapData [] _swapData , CelerCircleData _celerCircleData ) external payable
Array of swap operations to execute before bridging
Celer Circle-specific parameters
Data Structures CelerCircleData struct CelerCircleData { uint256 maxFee ; // Maximum bridge fee uint32 minFinalityThreshold ; // Minimum finality threshold }
Usage Example import { CelerCircleBridgeFacet } from '@lifi/contract-types' ; const celerCircleFacet = CelerCircleBridgeFacet__factory . connect ( facetAddress , signer ); const bridgeData = { transactionId: '0x...' , bridge: 'celer-circle' , integrator: 'my-dapp' , referrer: '0x0000000000000000000000000000000000000000' , sendingAssetId: '0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48' , // USDC receiver: '0x...' , minAmount: ethers . utils . parseUnits ( '100' , 6 ), destinationChainId: 43114 , // Avalanche hasSourceSwaps: false , hasDestinationCall: false }; const celerCircleData = { maxFee: ethers . utils . parseUnits ( '0.5' , 6 ), minFinalityThreshold: 12 }; const tx = await celerCircleFacet . startBridgeTokensViaCelerCircleBridge ( bridgeData , celerCircleData ); await tx . wait ();
Events The facet emits standard LiFi events:
LiFiTransferStarted(BridgeData bridgeData)LiFiTransferCompletedAssetSwapped (when using swapAndStart variant)
See Also