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199.486789155340007379 ETH

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Block
From
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Allow Refundees230242482025-07-29 10:37:59117 days ago1753785479IN
0xe64a54E2...80E2E4eb5
0 ETH0.000019320.78985266
Allow Contracts230242462025-07-29 10:37:35117 days ago1753785455IN
0xe64a54E2...80E2E4eb5
0 ETH0.000018560.75910105
Withdraw192620882024-02-19 13:31:11643 days ago1708349471IN
0xe64a54E2...80E2E4eb5
0 ETH0.0012731352.36853619
Transfer Ownersh...192620822024-02-19 13:29:59643 days ago1708349399IN
0xe64a54E2...80E2E4eb5
0 ETH0.0011437147.44902815
On Gas Spent187927622023-12-15 16:39:47709 days ago1702658387IN
0xe64a54E2...80E2E4eb5
0 ETH0.00420191156.84041828
Transfer186499592023-11-25 16:40:11729 days ago1700930411IN
0xe64a54E2...80E2E4eb5
150 ETH0.0006368428.45072384
Transfer173622402023-05-29 4:21:35909 days ago1685334095IN
0xe64a54E2...80E2E4eb5
9 ETH0.0006791430.34070353
Transfer170987062023-04-22 1:47:47946 days ago1682128067IN
0xe64a54E2...80E2E4eb5
500 ETH0.0007606233.98092894
On Gas Spent168734142023-03-21 3:42:11978 days ago1679370131IN
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0 ETH0.0004018615
On Gas Spent168734102023-03-21 3:41:23978 days ago1679370083IN
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0 ETH0.0004000615
On Gas Spent168734052023-03-21 3:40:23978 days ago1679370023IN
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0 ETH0.0004000615
On Gas Spent168731012023-03-21 2:38:59978 days ago1679366339IN
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0 ETH0.0004009615
Transfer162911882022-12-29 15:03:591060 days ago1672326239IN
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10 ETH0.0007372732.93764104
Transfer159806972022-11-16 6:08:351103 days ago1668578915IN
0xe64a54E2...80E2E4eb5
4 ETH0.0003071813.72331024
Transfer Ownersh...150474332022-06-29 23:17:201242 days ago1656544640IN
0xe64a54E2...80E2E4eb5
0 ETH0.0015589554.44411743
Set Max Refundee...150474082022-06-29 23:11:011242 days ago1656544261IN
0xe64a54E2...80E2E4eb5
0 ETH0.0017972959.1604469
Set Max Gas Cost150474032022-06-29 23:08:341242 days ago1656544114IN
0xe64a54E2...80E2E4eb5
0 ETH0.0013365944.1557874
Allow Contracts150473722022-06-29 23:00:391243 days ago1656543639IN
0xe64a54E2...80E2E4eb5
0 ETH0.0019992541.21929577
Allow Refundees150473712022-06-29 23:00:211243 days ago1656543621IN
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0 ETH0.0018544438.23431305

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Transfer238647382025-11-23 23:03:4758 secs ago1763939027
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Transfer238647312025-11-23 23:02:232 mins ago1763938943
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Transfer238647262025-11-23 23:01:233 mins ago1763938883
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Transfer238647172025-11-23 22:59:355 mins ago1763938775
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Transfer238647052025-11-23 22:57:117 mins ago1763938631
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Transfer238646922025-11-23 22:54:3510 mins ago1763938475
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Transfer238646782025-11-23 22:51:3513 mins ago1763938295
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Transfer238646662025-11-23 22:49:1115 mins ago1763938151
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Transfer238646572025-11-23 22:47:2317 mins ago1763938043
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Transfer238646412025-11-23 22:44:1120 mins ago1763937851
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Transfer238646282025-11-23 22:41:3523 mins ago1763937695
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Transfer238646162025-11-23 22:39:1125 mins ago1763937551
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Transfer238646042025-11-23 22:36:4727 mins ago1763937407
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Transfer238645912025-11-23 22:34:1130 mins ago1763937251
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Transfer238645792025-11-23 22:31:3533 mins ago1763937095
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Transfer238645692025-11-23 22:29:3535 mins ago1763936975
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Transfer238645582025-11-23 22:27:2337 mins ago1763936843
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Transfer238645472025-11-23 22:25:1139 mins ago1763936711
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Transfer238645382025-11-23 22:23:1141 mins ago1763936591
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Transfer238645292025-11-23 22:21:2343 mins ago1763936483
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Transfer238645212025-11-23 22:19:4744 mins ago1763936387
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Transfer238645122025-11-23 22:17:5946 mins ago1763936279
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Transfer238645002025-11-23 22:15:3549 mins ago1763936135
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Transfer238644932025-11-23 22:14:1150 mins ago1763936051
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Transfer238644832025-11-23 22:12:1152 mins ago1763935931
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Contract Source Code Verified (Exact Match)

Contract Name:
GasRefunder

Compiler Version
v0.8.7+commit.e28d00a7

Optimization Enabled:
Yes with 100 runs

Other Settings:
default evmVersion
// SPDX-License-Identifier: Apache-2.0

/*
 * Copyright 2021, Offchain Labs, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

pragma solidity ^0.8.7;

import "./IGasRefunder.sol";

import "@openzeppelin/contracts-0.8/access/Ownable.sol";

contract GasRefunder is IGasRefunder, Ownable {
    mapping(address => bool) public allowedContracts;
    mapping(address => bool) public allowedRefundees;
    address public disallower;

    struct CommonParameters {
        uint128 maxRefundeeBalance;
        uint32 extraGasMargin;
        uint8 calldataCost;
        uint64 maxGasTip;
        uint64 maxGasCost;
        uint32 maxSingleGasUsage;
    }

    CommonParameters public commonParams;

    enum CommonParameterKey {
        MAX_REFUNDEE_BALANCE,
        EXTRA_GAS_MARGIN,
        CALLDATA_COST,
        MAX_GAS_TIP,
        MAX_GAS_COST,
        MAX_SINGLE_GAS_USAGE
    }

    enum RefundDenyReason {
        CONTRACT_NOT_ALLOWED,
        REFUNDEE_NOT_ALLOWED,
        REFUNDEE_ABOVE_MAX_BALANCE,
        OUT_OF_FUNDS
    }

    event RefundedGasCosts(
        address indexed refundee,
        address indexed contractAddress,
        bool indexed success,
        uint256 gas,
        uint256 gasPrice,
        uint256 amountPaid
    );
    event RefundGasCostsDenied(
        address indexed refundee,
        address indexed contractAddress,
        RefundDenyReason indexed reason,
        uint256 gas
    );
    event Deposited(address sender, uint256 amount);
    event Withdrawn(address initiator, address destination, uint256 amount);
    event ContractAllowedSet(address indexed addr, bool indexed allowed);
    event RefundeeAllowedSet(address indexed addr, bool indexed allowed);
    event DisallowerSet(address indexed addr);
    event CommonParameterSet(CommonParameterKey indexed parameter, uint256 value);

    constructor() Ownable() {
        commonParams = CommonParameters({
            maxRefundeeBalance: 0, // no limit
            extraGasMargin: 4000, // 4k gas
            calldataCost: 12, // Between 4 for zero bytes and 16 for non-zero bytes
            maxGasTip: 2 gwei,
            maxGasCost: 120 gwei,
            maxSingleGasUsage: 2e6 // 2 million gas
        });
    }

    function setDisallower(address addr) external onlyOwner {
        disallower = addr;
        emit DisallowerSet(addr);
    }

    function allowContracts(address[] calldata addresses) external onlyOwner {
        setContractsAllowedImpl(addresses, true);
    }

    function disallowContracts(address[] calldata addresses) external {
        require(msg.sender == owner() || msg.sender == disallower, "NOT_AUTHORIZED");
        setContractsAllowedImpl(addresses, false);
    }

    function setContractsAllowedImpl(address[] calldata addresses, bool allow) internal {
        for (uint256 i = 0; i < addresses.length; i++) {
            address addr = addresses[i];
            allowedContracts[addr] = allow;
            emit ContractAllowedSet(addr, allow);
        }
    }

    function allowRefundees(address[] calldata addresses) external onlyOwner {
        setRefundeesAllowedImpl(addresses, true);
    }

    function disallowRefundees(address[] calldata addresses) external {
        require(msg.sender == owner() || msg.sender == disallower, "NOT_AUTHORIZED");
        setRefundeesAllowedImpl(addresses, false);
    }

    function setRefundeesAllowedImpl(address[] calldata addresses, bool allow) internal {
        for (uint256 i = 0; i < addresses.length; i++) {
            address addr = addresses[i];
            allowedRefundees[addr] = allow;
            emit RefundeeAllowedSet(addr, allow);
        }
    }

    function setMaxRefundeeBalance(uint128 newValue) external onlyOwner {
        commonParams.maxRefundeeBalance = newValue;
        emit CommonParameterSet(CommonParameterKey.MAX_REFUNDEE_BALANCE, newValue);
    }

    function setExtraGasMargin(uint32 newValue) external onlyOwner {
        commonParams.extraGasMargin = newValue;
        emit CommonParameterSet(CommonParameterKey.EXTRA_GAS_MARGIN, newValue);
    }

    function setCalldataCost(uint8 newValue) external onlyOwner {
        commonParams.calldataCost = newValue;
        emit CommonParameterSet(CommonParameterKey.CALLDATA_COST, newValue);
    }

    function setMaxGasTip(uint64 newValue) external onlyOwner {
        commonParams.maxGasTip = newValue;
        emit CommonParameterSet(CommonParameterKey.MAX_GAS_TIP, newValue);
    }

    function setMaxGasCost(uint64 newValue) external onlyOwner {
        commonParams.maxGasCost = newValue;
        emit CommonParameterSet(CommonParameterKey.MAX_GAS_COST, newValue);
    }

    function setMaxSingleGasUsage(uint32 newValue) external onlyOwner {
        commonParams.maxSingleGasUsage = newValue;
        emit CommonParameterSet(CommonParameterKey.MAX_SINGLE_GAS_USAGE, newValue);
    }

    receive() external payable {
        emit Deposited(msg.sender, msg.value);
    }

    function withdraw(address payable destination, uint256 amount) external onlyOwner {
        // It's expected that destination is an EOA
        (bool success, ) = destination.call{ value: amount }("");
        require(success, "WITHDRAW_FAILED");
        emit Withdrawn(msg.sender, destination, amount);
    }

    function onGasSpent(
        address payable refundee,
        uint256 gasUsed,
        uint256 calldataSize
    ) external override returns (bool success) {
        uint256 startGasLeft = gasleft();

        uint256 ownBalance = address(this).balance;

        if (ownBalance == 0) {
            emit RefundGasCostsDenied(refundee, msg.sender, RefundDenyReason.OUT_OF_FUNDS, gasUsed);
            return false;
        }

        if (!allowedContracts[msg.sender]) {
            emit RefundGasCostsDenied(
                refundee,
                msg.sender,
                RefundDenyReason.CONTRACT_NOT_ALLOWED,
                gasUsed
            );
            return false;
        }
        if (!allowedRefundees[refundee]) {
            emit RefundGasCostsDenied(
                refundee,
                msg.sender,
                RefundDenyReason.REFUNDEE_NOT_ALLOWED,
                gasUsed
            );
            return false;
        }

        uint256 estGasPrice = block.basefee + commonParams.maxGasTip;
        if (tx.gasprice < estGasPrice) {
            estGasPrice = tx.gasprice;
        }
        if (commonParams.maxGasCost != 0 && estGasPrice > commonParams.maxGasCost) {
            estGasPrice = commonParams.maxGasCost;
        }

        // Retrieve these variables before measuring gasleft()
        uint256 refundeeBalance = refundee.balance;
        uint256 maxRefundeeBalance = commonParams.maxRefundeeBalance;
        uint256 maxSingleGasUsage = commonParams.maxSingleGasUsage;

        // Add in a bit of a buffer for the tx costs not measured with gasleft
        gasUsed +=
            startGasLeft +
            commonParams.extraGasMargin +
            (calldataSize * commonParams.calldataCost);
        // Split this up into two statements so that gasleft() comes after the storage loads
        gasUsed -= gasleft();

        if (maxSingleGasUsage != 0 && gasUsed > maxSingleGasUsage) {
            gasUsed = maxSingleGasUsage;
        }

        uint256 refundAmount = estGasPrice * gasUsed;
        if (maxRefundeeBalance != 0 && refundeeBalance + refundAmount > maxRefundeeBalance) {
            if (refundeeBalance > maxRefundeeBalance) {
                // The refundee is already above their max balance
                emit RefundGasCostsDenied(
                    refundee,
                    msg.sender,
                    RefundDenyReason.REFUNDEE_ABOVE_MAX_BALANCE,
                    gasUsed
                );
                return false;
            } else {
                refundAmount = maxRefundeeBalance - refundeeBalance;
            }
        }

        if (refundAmount > ownBalance) {
            refundAmount = ownBalance;
        }

        // It's expected that refundee is an EOA
        (success, ) = refundee.call{ value: refundAmount }("");
        emit RefundedGasCosts(refundee, msg.sender, success, gasUsed, estGasPrice, refundAmount);
    }
}

File 2 of 4 : IGasRefunder.sol
// SPDX-License-Identifier: Apache-2.0

/*
 * Copyright 2021, Offchain Labs, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

pragma solidity >=0.6.11 <0.7.0 || >=0.8.7 <0.9.0;

interface IGasRefunder {
    function onGasSpent(
        address payable spender,
        uint256 gasUsed,
        uint256 calldataSize
    ) external returns (bool success);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev 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.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

Settings
{
  "optimizer": {
    "enabled": true,
    "runs": 100
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "metadata": {
    "useLiteralContent": true
  },
  "libraries": {}
}

Contract Security Audit

Contract ABI

API
[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"enum GasRefunder.CommonParameterKey","name":"parameter","type":"uint8"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"CommonParameterSet","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"addr","type":"address"},{"indexed":true,"internalType":"bool","name":"allowed","type":"bool"}],"name":"ContractAllowedSet","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"sender","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Deposited","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"addr","type":"address"}],"name":"DisallowerSet","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"refundee","type":"address"},{"indexed":true,"internalType":"address","name":"contractAddress","type":"address"},{"indexed":true,"internalType":"enum GasRefunder.RefundDenyReason","name":"reason","type":"uint8"},{"indexed":false,"internalType":"uint256","name":"gas","type":"uint256"}],"name":"RefundGasCostsDenied","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"refundee","type":"address"},{"indexed":true,"internalType":"address","name":"contractAddress","type":"address"},{"indexed":true,"internalType":"bool","name":"success","type":"bool"},{"indexed":false,"internalType":"uint256","name":"gas","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"gasPrice","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"amountPaid","type":"uint256"}],"name":"RefundedGasCosts","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"addr","type":"address"},{"indexed":true,"internalType":"bool","name":"allowed","type":"bool"}],"name":"RefundeeAllowedSet","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"initiator","type":"address"},{"indexed":false,"internalType":"address","name":"destination","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Withdrawn","type":"event"},{"inputs":[{"internalType":"address[]","name":"addresses","type":"address[]"}],"name":"allowContracts","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address[]","name":"addresses","type":"address[]"}],"name":"allowRefundees","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"allowedContracts","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"allowedRefundees","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"commonParams","outputs":[{"internalType":"uint128","name":"maxRefundeeBalance","type":"uint128"},{"internalType":"uint32","name":"extraGasMargin","type":"uint32"},{"internalType":"uint8","name":"calldataCost","type":"uint8"},{"internalType":"uint64","name":"maxGasTip","type":"uint64"},{"internalType":"uint64","name":"maxGasCost","type":"uint64"},{"internalType":"uint32","name":"maxSingleGasUsage","type":"uint32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address[]","name":"addresses","type":"address[]"}],"name":"disallowContracts","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address[]","name":"addresses","type":"address[]"}],"name":"disallowRefundees","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"disallower","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address 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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.