layerzero

Inherit OApp, call _quote to get the MessagingFee, then call _lzSend with the destination eid, payload, options, and fee. On the destination, override _lzReceive to handle the incoming payload. Always quote fees immediately before sending.

V2 replaces V1's LZApp and monolithic oracle-relayer model with OApp contracts, EndpointV2, and modular DVN plus Executor verification. Use @layerzerolabs/oapp-evm for V2; the solidity-examples package is V1 and should not be imported.

Deploy OFTAdapter on the token's home chain to lock the original ERC-20, and deploy OFT contracts on remote chains that mint representations. Set peers bidirectionally using bytes32-encoded addresses, then call send with a quoted fee.

NoPeer means setPeer was never called for that destination eid on the source OApp. OnlyPeer means the receiving chain has not registered the sender as its peer. Peers must be set bidirectionally using left-padded bytes32 addresses, not raw addresses.

DVNs wait for the configured block confirmations before verifying; Ethereum defaults to around 15 confirmations. Also verify your DVN configuration supports the specific chain pair, since not all DVNs operate on every pathway.

OFT normalizes tokens to 6 shared decimals by default, so an 18-decimal token loses 12 digits of dust per transfer. Override sharedDecimals() to increase precision, and set minAmountLD based on the post-conversion amount to avoid SlippageExceeded reverts.