> For the complete Linea documentation index, see [llms.txt](/llms.txt). > Agents can fetch this page as Markdown at [https://docs.linea.build/api/linea-smart-contracts/messageservice/l2/v1/l2messageservicev1.md](https://docs.linea.build/api/linea-smart-contracts/messageservice/l2/v1/l2messageservicev1.md). # L2MessageServiceV1 # `L2MessageServiceV1` ### MINIMUM_FEE_SETTER_ROLE ```solidity bytes32 MINIMUM_FEE_SETTER_ROLE ``` The role required to set the minimum DDOS fee. ### _messageSender ```solidity address _messageSender ``` _The temporary message sender set when claiming a message._ ### nextMessageNumber ```solidity uint256 nextMessageNumber ``` ### minimumFeeInWei ```solidity uint256 minimumFeeInWei ``` ### REFUND_OVERHEAD_IN_GAS ```solidity uint256 REFUND_OVERHEAD_IN_GAS ``` ### DEFAULT_SENDER_ADDRESS ```solidity address DEFAULT_SENDER_ADDRESS ``` _The default message sender address reset after claiming a message._ ### constructor ```solidity constructor() internal ``` ### sendMessage ```solidity function sendMessage(address _to, uint256 _fee, bytes _calldata) external payable ``` Adds a message for sending cross-chain and emits a relevant event. _The message number is preset and only incremented at the end if successful for the next caller._ #### Parameters | Name | Type | Description | | --- | --- | --- | | _to | address | The address the message is intended for. | | _fee | uint256 | The fee being paid for the message delivery. | | _calldata | bytes | The calldata to pass to the recipient. | ### claimMessage ```solidity function claimMessage(address _from, address _to, uint256 _fee, uint256 _value, address payable _feeRecipient, bytes _calldata, uint256 _nonce) external ``` Claims and delivers a cross-chain message. #### Parameters | Name | Type | Description | | --- | --- | --- | | _from | address | The address of the original sender. | | _to | address | The address the message is intended for. | | _fee | uint256 | The fee being paid for the message delivery. | | _value | uint256 | The value to be transferred to the destination address. | | _feeRecipient | address payable | The recipient for the fee. | | _calldata | bytes | The calldata to pass to the recipient. | | _nonce | uint256 | The unique auto generated message number used when sending the message. | ### setMinimumFee ```solidity function setMinimumFee(uint256 _feeInWei) external ``` The Fee Manager sets a minimum fee to address DOS protection. _MINIMUM_FEE_SETTER_ROLE is required to set the minimum fee._ #### Parameters | Name | Type | Description | | --- | --- | --- | | _feeInWei | uint256 | New minimum fee in Wei. | ### sender ```solidity function sender() external view returns (address originalSender) ``` #### Return Values | Name | Type | Description | | --- | --- | --- | | originalSender | address | The original sender stored temporarily at the _messageSender address in storage. | ### distributeFees ```solidity modifier distributeFees(uint256 _feeInWei, address _to, bytes _calldata, address _feeRecipient) ``` The unspent fee is refunded if applicable. #### Parameters | Name | Type | Description | | --- | --- | --- | | _feeInWei | uint256 | The fee paid for delivery in Wei. | | _to | address | The recipient of the message and gas refund. | | _calldata | bytes | The calldata of the message. | | _feeRecipient | address | | Contributions not accepted These reference pages are automatically generated based on Linea's [smart contracts](https://github.com/Consensys/linea-monorepo/tree/main/contracts/src). To ensure they accurately match the deployed smart contracts, we cannot accept any contributions that edit these pages.