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scroll/contracts/docs/apis/L1ScrollMessenger.md

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# L1ScrollMessenger
> L1ScrollMessenger
The `L1ScrollMessenger` contract can: 1. send messages from layer 1 to layer 2; 2. relay messages from layer 2 layer 1; 3. replay failed message by replacing the gas limit; 4. drop expired message due to sequencer problems.
*All deposited Ether (including `WETH` deposited throng `L1WETHGateway`) will locked in this contract.*
## Methods
### counterpart
```solidity
function counterpart() external view returns (address)
```
The address of counterpart ScrollMessenger contract in L1/L2.
#### Returns
| Name | Type | Description |
|---|---|---|
| _0 | address | undefined |
### feeVault
```solidity
function feeVault() external view returns (address)
```
The address of fee vault, collecting cross domain messaging fee.
#### Returns
| Name | Type | Description |
|---|---|---|
| _0 | address | undefined |
### initialize
```solidity
function initialize(address _counterpart, address _feeVault, address _rollup, address _messageQueue) external nonpayable
```
Initialize the storage of L1ScrollMessenger.
#### Parameters
| Name | Type | Description |
|---|---|---|
| _counterpart | address | The address of L2ScrollMessenger contract in L2. |
| _feeVault | address | The address of fee vault, which will be used to collect relayer fee. |
| _rollup | address | The address of ScrollChain contract. |
| _messageQueue | address | The address of L1MessageQueue contract. |
### isL1MessageSent
```solidity
function isL1MessageSent(bytes32) external view returns (bool)
```
Mapping from L1 message hash to sent status.
#### Parameters
| Name | Type | Description |
|---|---|---|
| _0 | bytes32 | undefined |
#### Returns
| Name | Type | Description |
|---|---|---|
| _0 | bool | undefined |
### isL2MessageExecuted
```solidity
function isL2MessageExecuted(bytes32) external view returns (bool)
```
Mapping from L2 message hash to a boolean value indicating if the message has been successfully executed.
#### Parameters
| Name | Type | Description |
|---|---|---|
| _0 | bytes32 | undefined |
#### Returns
| Name | Type | Description |
|---|---|---|
| _0 | bool | undefined |
### messageQueue
```solidity
function messageQueue() external view returns (address)
```
The address of L1MessageQueue contract.
#### Returns
| Name | Type | Description |
|---|---|---|
| _0 | address | undefined |
### owner
```solidity
function owner() external view returns (address)
```
*Returns the address of the current owner.*
#### Returns
| Name | Type | Description |
|---|---|---|
| _0 | address | undefined |
### paused
```solidity
function paused() external view returns (bool)
```
*Returns true if the contract is paused, and false otherwise.*
#### Returns
| Name | Type | Description |
|---|---|---|
| _0 | bool | undefined |
### relayMessageWithProof
```solidity
function relayMessageWithProof(address _from, address _to, uint256 _value, uint256 _nonce, bytes _message, IL1ScrollMessenger.L2MessageProof _proof) external nonpayable
```
#### Parameters
| Name | Type | Description |
|---|---|---|
| _from | address | undefined |
| _to | address | undefined |
| _value | uint256 | undefined |
| _nonce | uint256 | undefined |
| _message | bytes | undefined |
| _proof | IL1ScrollMessenger.L2MessageProof | undefined |
### renounceOwnership
```solidity
function renounceOwnership() external nonpayable
```
*Leaves the contract without owner. It will not be possible to call `onlyOwner` functions anymore. Can only be called by the current owner. NOTE: Renouncing ownership will leave the contract without an owner, thereby removing any functionality that is only available to the owner.*
### replayMessage
```solidity
function replayMessage(address _from, address _to, uint256 _value, uint256 _queueIndex, bytes _message, uint32 _newGasLimit, address _refundAddress) external payable
```
Replay an existing message.
#### Parameters
| Name | Type | Description |
|---|---|---|
| _from | address | undefined |
| _to | address | undefined |
| _value | uint256 | undefined |
| _queueIndex | uint256 | undefined |
| _message | bytes | undefined |
| _newGasLimit | uint32 | undefined |
| _refundAddress | address | undefined |
### rollup
```solidity
function rollup() external view returns (address)
```
The address of Rollup contract.
#### Returns
| Name | Type | Description |
|---|---|---|
| _0 | address | undefined |
### sendMessage
```solidity
function sendMessage(address _to, uint256 _value, bytes _message, uint256 _gasLimit, address _refundAddress) external payable
```
Send cross chain message from L1 to L2 or L2 to L1.
#### Parameters
| Name | Type | Description |
|---|---|---|
| _to | address | undefined |
| _value | uint256 | undefined |
| _message | bytes | undefined |
| _gasLimit | uint256 | undefined |
| _refundAddress | address | undefined |
### sendMessage
```solidity
function sendMessage(address _to, uint256 _value, bytes _message, uint256 _gasLimit) external payable
```
Send cross chain message from L1 to L2 or L2 to L1.
#### Parameters
| Name | Type | Description |
|---|---|---|
| _to | address | undefined |
| _value | uint256 | undefined |
| _message | bytes | undefined |
| _gasLimit | uint256 | undefined |
### setPause
```solidity
function setPause(bool _status) external nonpayable
```
Pause the contract
*This function can only called by contract owner.*
#### Parameters
| Name | Type | Description |
|---|---|---|
| _status | bool | The pause status to update. |
### transferOwnership
```solidity
function transferOwnership(address newOwner) external nonpayable
```
*Transfers ownership of the contract to a new account (`newOwner`). Can only be called by the current owner.*
#### Parameters
| Name | Type | Description |
|---|---|---|
| newOwner | address | undefined |
### updateFeeVault
```solidity
function updateFeeVault(address _newFeeVault) external nonpayable
```
Update fee vault contract.
*This function can only called by contract owner.*
#### Parameters
| Name | Type | Description |
|---|---|---|
| _newFeeVault | address | The address of new fee vault contract. |
### xDomainMessageSender
```solidity
function xDomainMessageSender() external view returns (address)
```
See {IScrollMessenger-xDomainMessageSender}
#### Returns
| Name | Type | Description |
|---|---|---|
| _0 | address | undefined |
## Events
### FailedRelayedMessage
```solidity
event FailedRelayedMessage(bytes32 indexed messageHash)
```
Emitted when a cross domain message is failed to relay.
#### Parameters
| Name | Type | Description |
|---|---|---|
| messageHash `indexed` | bytes32 | undefined |
### OwnershipTransferred
```solidity
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner)
```
#### Parameters
| Name | Type | Description |
|---|---|---|
| previousOwner `indexed` | address | undefined |
| newOwner `indexed` | address | undefined |
### Paused
```solidity
event Paused(address account)
```
#### Parameters
| Name | Type | Description |
|---|---|---|
| account | address | undefined |
### RelayedMessage
```solidity
event RelayedMessage(bytes32 indexed messageHash)
```
Emitted when a cross domain message is relayed successfully.
#### Parameters
| Name | Type | Description |
|---|---|---|
| messageHash `indexed` | bytes32 | undefined |
### SentMessage
```solidity
event SentMessage(address indexed sender, address indexed target, uint256 value, uint256 messageNonce, uint256 gasLimit, bytes message)
```
Emitted when a cross domain message is sent.
#### Parameters
| Name | Type | Description |
|---|---|---|
| sender `indexed` | address | undefined |
| target `indexed` | address | undefined |
| value | uint256 | undefined |
| messageNonce | uint256 | undefined |
| gasLimit | uint256 | undefined |
| message | bytes | undefined |
### Unpaused
```solidity
event Unpaused(address account)
```
#### Parameters
| Name | Type | Description |
|---|---|---|
| account | address | undefined |
### UpdateFeeVault
```solidity
event UpdateFeeVault(address _oldFeeVault, address _newFeeVault)
```
Emitted when owner updates fee vault contract.
#### Parameters
| Name | Type | Description |
|---|---|---|
| _oldFeeVault | address | undefined |
| _newFeeVault | address | undefined |