Bridge methods

Bridge connects Ethereum and Base through LayerZero V2 OFT. The app uses the canonical fxUSD and fxSAVE keys, or an explicitly reviewed advanced OFT. Quotes and sends use the source chain; delivery is verified on the destination chain.

getBridgeQuote#

Read the messaging fees for a proposed send. No signing.

Input

sourceChainId, different destChainId, token, positive amount, recipient, and source RPC configuration. The upstream request makes sourceRpcUrl optional; FxAeon supplies a chain-verified source transport.

Output

nativeFee and lzTokenFee as bigint. These are messaging fees, separate from source-chain transaction gas.

Refresh

Requote after any bridge input or source RPC changes. This preview does not reserve a fee; building the transaction obtains a fresh quote.

buildBridgeTx#

Prepare the source-chain OFT send and its fee quote.

Input

The quote inputs, plus optional refundAddress. Review the actual refund recipient: SDK 1.0.5 falls back to the destination recipient when no valid refund address is supplied.

Output

{ tx: { to, data, value }, quote }. The SDK returns one source send; FxAeon may prepend one exact Ethereum token approval when required.

Review and refresh

Bind the token, amount, destination, recipient, refund address, fees, and minimum delivery amount before signing. Confirm each source step in order. Then verify matching LayerZero GUID events on the destination; a source receipt alone is not delivery.

See the bridge planner and contract checks (opens in a new tab).