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LayerZero EndpointV2

The main entry point for all cross-chain messaging operations. This contract handles message routing, fee calculation, and configuration management.

Message Routing

Core functions for sending and receiving messages between smart contracts.

quote() - Get Fee Estimates

CALL

0x0fbd277fquote(_params: MessagingParams, _sender: address)

send() - Send Messages

SEND

0x1fd91580send(_params: MessagingParams, _refundAddress: address)

lzReceive() - Receive Messages

SEND

0xbb68813elzReceive(_origin: Origin, _receiver: address, _guid: bytes32, _message: bytes, _extraData: bytes)

sendCompose() - Send Compose Messages

SEND

0x7cb59012sendCompose(_to: address, _guid: bytes32, _index: uint16, _message: bytes)

lzCompose() - Execute Compose Messages

SEND

0x91d20fa1lzCompose(_from: address, _to: address, _guid: bytes32, _index: uint16, _message: bytes, _extraData: bytes)

Configuration Management

Functions for setting custom verification, execution, and pathway management.

isRegisteredLibrary() - Check Library Registration

CALL

0xdc706a62isRegisteredLibrary(lib: address)

receiveLibraryTimeout() - Get Library Timeout

CALL

0xef667aa1receiveLibraryTimeout(receiver: address, srcEid: uint32)

setDelegate() - Set Delegate Address

SEND

0xca5eb5e1setDelegate(_delegate: address)

setSendLibrary() - Configure Send Library

SEND

0x9535ff30setSendLibrary(_oapp: address, _eid: uint32, _newLib: address)

setReceiveLibrary() - Configure Receive Library

SEND

0x6a14d715setReceiveLibrary(_oapp: address, _eid: uint32, _newLib: address, _gracePeriod: uint256)

setConfig() - Set Configuration Parameters

SEND

0x01dd9320setConfig(_oapp: address, _lib: address, _params: SetConfigParam[])

Message Recovery & Security

Functions for handling message exceptions, security threats, and recovery scenarios.

burn() - Permanently Block Message

SEND

0x40f80683burn(_oapp: address, _srcEid: uint32, _sender: bytes32, _nonce: uint64, _payloadHash: bytes32)

skip() - Skip Message Nonce

SEND

0xd70b8902skip(_oapp: address, _srcEid: uint32, _sender: bytes32, _nonce: uint64)

nilify() - Mark Message as Nil

SEND

0x2e80fbf3nilify(_oapp: address, _srcEid: uint32, _sender: bytes32, _nonce: uint64, _payloadHash: bytes32)

clear() - Clear Stored Message

SEND

0x841515b1clear(_oapp: address, _origin: Origin, _guid: bytes32, _message: bytes)

Status Checks

Functions for querying current configuration settings, library assignments, nonce tracking, and message states.

getConfig() - Check Configuration

CALL

0x2b3197b9getConfig(_oapp: address, _lib: address, _eid: uint32, _configType: uint32)

delegates() - Check Delegate Address

CALL

0x587cde1edelegates(oapp: address)

getSendLibrary() - Get Send Library

CALL

0xb96a277fgetSendLibrary(_sender: address, _dstEid: uint32)

getReceiveLibrary() - Get Receive Library

CALL

0x402f8468getReceiveLibrary(_receiver: address, _srcEid: uint32)

inboundNonce() - Get Processed Nonce

CALL

0xa0dd43fcinboundNonce(_receiver: address, _srcEid: uint32, _sender: bytes32)

lazyInboundNonce() - Get Lazy Nonce

CALL

0x5b17bb70lazyInboundNonce(receiver: address, srcEid: uint32, sender: bytes32)

initializable() - Check Message Initialization

CALL

0x8a237427initializable(_origin: Origin, _receiver: address)

verifiable() - Check Message Verification

CALL

0xbe619818verifiable(_origin: Origin, _receiver: address)

inboundPayloadHash() - Get Message Payload Hash

CALL

0xc9fc7bcdinboundPayloadHash(receiver: address, srcEid: uint32, sender: bytes32, inboundNonce: uint64)

nextGuid() - Get Next Message GUID

CALL

0xaafe5e07nextGuid(_sender: address, _dstEid: uint32, _receiver: bytes32)

composeQueue() - Check Compose Message Queue

CALL

0x35d330b0composeQueue(from: address, to: address, guid: bytes32, index: uint16)

isSendingMessage() - Check Send State

CALL

0x79624ca9isSendingMessage()

getSendContext() - Get Current Send Context

CALL

0x14f651a9getSendContext()

Key Functions to Try:

• Messaging Operations:
  • quote() - Get fee estimates for cross-chain messages
  • send() - Send messages to other chains
  • lzReceive() - Receive messages from other chains
  • sendCompose() - Queue compose messages
  • lzCompose() - Execute compose messages
• Configuration Management:
  • setDelegate() - Assign configuration permissions
  • setSendLibrary() - Choose send message library
  • setReceiveLibrary() - Choose receive message library
  • setConfig() - Set library-specific parameters
• Message Recovery & Security:
  • burn() - Permanently block malicious messages
  • skip() - Skip flagged message nonces
  • nilify() - Mark messages for re-verification
  • clear() - Clear verified but unexecuted messages
• Status Checks:
  • getConfig() - Check current configurations
  • delegates() - View current delegate address
  • getSendLibrary() - Check send library for endpoint
  • getReceiveLibrary() - Check receive library for endpoint
  • inboundNonce() - Get highest processed message nonce
  • lazyInboundNonce() - Get highest verified/skipped nonce
  • nextGuid() - Get next message GUID
  • composeQueue() - Check compose queue
  • isSendingMessage() - Check send state
  • getSendContext() - Get send context

Omnichain Application (OApp)

The foundation for building any cross-chain application. OApp provides the core messaging infrastructure.

Core Information

oAppVersion() - Get OApp Version

CALL

0x17442b70oAppVersion()

endpoint() - Get Endpoint Address

CALL

0x5e280f11endpoint()

Peer Configuration

peers() - Get Remote Peer Address

CALL

0xbb0b6a53peers(eid: uint32)

setPeer() - Connect Remote Chains

SEND

0x3400288bsetPeer(_eid: uint32, _peer: bytes32)

setDelegate() - Set Configuration Delegate

SEND

0xca5eb5e1setDelegate(_delegate: address)

Message Reception

allowInitializePath() - Check Path Initialization

CALL

0xbfe94e81allowInitializePath(origin: Origin)

nextNonce() - Get Next Message Nonce

CALL

0x7d25a05enextNonce(: uint32, : bytes32)

lzReceive() - Receive Cross-Chain Messages

SEND

0xbf282d99lzReceive(_origin: Origin, _guid: bytes32, _message: bytes, _executor: address, _extraData: bytes)

Composability

isComposeMsgSender() - Verify Compose Sender

CALL

0x8833c245isComposeMsgSender(: Origin, : bytes, _sender: address)

Key Functions to Try:

• Core Information:
  • oAppVersion() - Get OApp version information
  • endpoint() - Get connected endpoint address
• Peer Configuration:
  • setPeer() - Connect to remote chains
  • peers() - Check connected chains
  • setDelegate() - Set configuration delegate
• Message Reception:
  • lzReceive() - Receive cross-chain messages
  • allowInitializePath() - Check path initialization
  • nextNonce() - Get message ordering info
• Composability:
  • isComposeMsgSender() - Verify compose sender

Tips:

• Peers must be set before messaging
• Nonces ensure ordered delivery
• Options control execution parameters

Omnichain Application Read (OAppRead)

OAppRead extends the standard OApp with LayerZero Read functionality, enabling cross-chain data reading capabilities. It includes all standard OApp methods plus the read channel configuration.

setReadChannel() - Configure Read Channel

SEND

0xf0a9e481setReadChannel(_channelId: uint32, _active: bool)

Key Functions to Try:

• setReadChannel() - Configure read channel for cross-chain data reading
• Plus all standard OApp functions listed above

Omnichain Fungible Token (OFT)

OFT inherits from OApp, providing all cross-chain messaging capabilities plus token-specific functionality. Create tokens that work seamlessly across multiple blockchains while maintaining a unified supply.

Send Tokens

quoteSend() - Get Transfer Fees

CALL

0x2f603a24quoteSend(_sendParam: SendParam, _payInLzToken: bool)

quoteOFT() - Get Detailed Transfer Quote

CALL

0xe6343d44quoteOFT(_sendParam: SendParam)

send() - Transfer Tokens

SEND

0xccfc9451send(_sendParam: SendParam, _fee: MessagingFee, _refundAddress: address)

Token Details

sharedDecimals() - Get Shared Decimals

CALL

0x857749b0sharedDecimals()

approvalRequired() - Check Approval Requirement

CALL

0x9f68b964approvalRequired()

oftVersion() - Get OFT Version

CALL

0x156a0d0foftVersion()

token() - Get Underlying Token Address

CALL

0xfc0c546atoken()

decimalConversionRate() - Get Decimal Conversion Factor

CALL

0x963efcaadecimalConversionRate()

Management Functions

owner() - Get Current Owner

CALL

0x8da5cb5bowner()

transferOwnership() - Transfer Contract Ownership

SEND

0xf2fde38btransferOwnership(newOwner: address)

renounceOwnership() - Renounce Ownership

SEND

0x715018a6renounceOwnership()

setPeer() - Connect to Remote OFTs

SEND

0x3400288bsetPeer(_eid: uint32, _peer: bytes32)

setEnforcedOptions() - Configure Message Options

SEND

0xd833f371setEnforcedOptions(_enforcedOptions: EnforcedOptionParam[])

setMsgInspector() - Set Message Inspector

SEND

0x6fc1b31esetMsgInspector(_msgInspector: address)

Key Functions to Try:

• Transfer Operations:
  • quoteSend() - Get transfer fee estimates
  • send() - Transfer tokens cross-chain
  • quoteOFT() - Get comprehensive transfer quotes
• Token Information:
  • sharedDecimals() - Check decimal configuration
  • approvalRequired() - Check if approval is needed
  • oftVersion() - Get OFT implementation version
  • token() - Get underlying token address
  • decimalConversionRate() - Get decimal conversion factor
• Management Functions:
  • owner() - Check current contract owner
  • setPeer() - Connect to OFTs on other chains
  • setEnforcedOptions() - Configure security parameters
  • setMsgInspector() - Set message inspector
  • transferOwnership() - Transfer contract ownership
  • renounceOwnership() - Permanently remove ownership

Tips:

• Always call quoteSend() before send() to get accurate fees
• The minAmountLD parameter provides slippage protection
• Shared decimals (typically 6-8) may differ from local decimals (e.g., 18 for most ERC20s)
• approvalRequired() returns false for OFT and true for OFTAdapter
• Use quoteOFT() for detailed information including transfer limits and fee breakdowns
• OFTAdapter requires approval on the underlying token before sending
• Must call setPeer() to connect OFTs on different chains before transfers
• Only the contract owner can call management functions
• Use setEnforcedOptions() to enforce minimum gas limits for security
• renounceOwnership() is irreversible - use with extreme caution

For complete contract documentation including all functions, events, and technical details:

• Contract Standards Overview
• OApp Technical Reference
• OFT Technical Reference
• Protocol Contracts

info

Contract ABIs shown here are from the latest deployment. Always verify addresses and ABIs for your specific use case.