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0x6C5Fdc0c53b122Ae0f15a863C349f3A481DE8f1F
 

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Transfer Ownersh...205854342024-08-22 16:47:23168 days ago1724345243IN
0x6C5Fdc0c...481DE8f1F
0 ETH0.000065292.28045613

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Contract Source Code Verified (Exact Match)

Contract Name:
MainnetDolaFlashMinter

Compiler Version
v0.8.20+commit.a1b79de6

Optimization Enabled:
Yes with 10000 runs

Other Settings:
shanghai EvmVersion
File 1 of 9 : MainnetDolaFlashMinter.sol
//SPDX-License-Identifier: None
pragma solidity ^0.8.0;

import "./DolaFlashMinter.sol";

contract MainnetDolaFlashMinter is DolaFlashMinter {
    constructor()
        DolaFlashMinter(
            // Mainnet Dola
            0x865377367054516e17014CcdED1e7d814EDC9ce4,
            // Mainnet Inverse Treasury
            0x926dF14a23BE491164dCF93f4c468A50ef659D5B
        )
    // solhint-disable-next-line no-empty-blocks
    {

    }
}

File 2 of 9 : DolaFlashMinter.sol
//SPDX-License-Identifier: None
pragma solidity ^0.8.0;

import "./interfaces/IERC3156FlashBorrower.sol";
import "./interfaces/IERC3156FlashLender.sol";
import "./utils/Ownable.sol";
import "./utils/Address.sol";
import "./ERC20/IERC20.sol";
import "./ERC20/SafeERC20.sol";

/**
 * @title Dola Flash Minter
 * @notice Allow users to mint an arbitrary amount of DOLA without collateral
 *         as long as this amount is repaid within a single transaction.
 * @dev This contract is abstract, any concrete implementation must have the DOLA
 *      token address hardcoded in the contract to facilitate code auditing.
 */
abstract contract DolaFlashMinter is Ownable, IERC3156FlashLender {
    using SafeERC20 for IERC20;
    using Address for address;
    using Address for address payable;
    event FlashLoan(address receiver, address token, uint256 value);
    event TreasuryUpdated(address oldTreasury, address newTreasury);
    event MaxFlashLimitUpdated(uint256 oldLimit, uint256 newLimit);

    IERC20 public immutable dola;
    uint256 public constant fee = 0;
    address public treasury;
    uint256 public flashMinted;
    uint256 public maxFlashLimit;

    bytes32 public constant CALLBACK_SUCCESS = keccak256("ERC3156FlashBorrower.onFlashLoan");

    constructor(address _dola, address _treasury) {
        require(_dola.isContract(), "FLASH_MINTER:INVALID_DOLA");
        require(_treasury != address(0), "FLASH_MINTER:INVALID_TREASURY");
        dola = IERC20(_dola);
        treasury = _treasury;
    }

    function flashLoan(
        IERC3156FlashBorrower receiver,
        address token,
        uint256 value,
        bytes calldata data
    ) external override returns (bool) {
        require(token == address(dola), "FLASH_MINTER:NOT_DOLA");
        require(value <= maxFlashLimit, "FLASH_MINTER:INDIVIDUAL_LIMIT_BREACHED");
        flashMinted = flashMinted + value;
        require(flashMinted <= maxFlashLimit, "total loan limit exceeded");

        // Step 1: Mint Dola to receiver
        dola.mint(address(receiver), value);
        emit FlashLoan(address(receiver), token, value);

        // Step 2: Make flashloan callback
        require(
            receiver.onFlashLoan(msg.sender, token, value, fee, data) == CALLBACK_SUCCESS,
            "FLASH_MINTER:CALLBACK_FAILURE"
        );
        // Step 3: Retrieve minted Dola from receiver
        dola.safeTransferFrom(address(receiver), address(this), value);

        // Step 4: Burn minted Dola (and leave accrued fees in contract)
        dola.burn(value);

        flashMinted = flashMinted - value;
        return true;
    }

    // Collect fees and retrieve any tokens sent to this contract by mistake
    function collect(address _token) external {
        if (_token == address(0)) {
            payable(treasury).sendValue(address(this).balance);
        } else {
            uint256 balance = IERC20(_token).balanceOf(address(this));
            IERC20(_token).safeTransfer(treasury, balance);
        }
    }

    function setTreasury(address _newTreasury) external onlyOwner {
        require(_newTreasury != address(0), "FLASH_MINTER:INVALID_TREASURY");
        emit TreasuryUpdated(treasury, _newTreasury);
        treasury = _newTreasury;
    }

    function setMaxFlashLimit(uint256 _newLimit) external onlyOwner {
        emit MaxFlashLimitUpdated(maxFlashLimit, _newLimit);
        maxFlashLimit = _newLimit;
    }

    function maxFlashLoan(address _token) external view override returns (uint256) {
        return _token == address(dola) ? maxFlashLimit - flashMinted : 0;
    }

    function flashFee(address _token, uint256) public view override returns (uint256) {
        require(_token == address(dola), "FLASH_MINTER:NOT_DOLA");
        return fee;
    }

    // solhint-disable-next-line no-empty-blocks
    receive() external payable {}
}

File 3 of 9 : IERC3156FlashBorrower.sol
pragma solidity ^0.8.0;

interface IERC3156FlashBorrower {

  /**
    * @dev Receive a flash loan.
    * @param initiator The initiator of the loan.
    * @param token The loan currency.
    * @param amount The amount of tokens lent.
    * @param fee The additional amount of tokens to repay.
    * @param data Arbitrary data structure, intended to contain user-defined parameters.
    * @return The keccak256 hash of "ERC3156FlashBorrower.onFlashLoan"
    */
  function onFlashLoan(
      address initiator,
      address token,
      uint256 amount,
      uint256 fee,
      bytes calldata data
  ) external returns (bytes32);
}

File 4 of 9 : IERC3156FlashLender.sol
pragma solidity ^0.8.0;

import "./IERC3156FlashBorrower.sol";

interface IERC3156FlashLender {
  /**
    * @dev The amount of currency available to be lent.
    * @param token The loan currency.
    * @return The amount of `token` that can be borrowed.
    */
  function maxFlashLoan(
      address token
  ) external view returns (uint256);

  /**
    * @dev The fee to be charged for a given loan.
    * @param token The loan currency.
    * @param value The amount of tokens lent.
    * @return The amount of `token` to be charged for the loan, on top of the returned principal.
    */
  function flashFee(
      address token,
      uint256 value
  ) external view returns (uint256);

  /**
    * @dev Initiate a flash loan.
    * @param receiver The receiver of the tokens in the loan, and the receiver of the callback.
    * @param token The loan currency.
    * @param value The amount of tokens lent.
    * @param data Arbitrary data structure, intended to contain user-defined parameters.
    */
  function flashLoan(
      IERC3156FlashBorrower receiver,
      address token,
      uint256 value,
      bytes calldata data
  ) external returns (bool);
}

File 5 of 9 : Ownable.sol
pragma solidity ^0.8.0;

import "./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 () {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), 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 {
        emit OwnershipTransferred(_owner, address(0));
        _owner = 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");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

File 6 of 9 : Address.sol
pragma solidity ^0.8.0;

library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts
        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
        // for accounts without code, i.e. `keccak256('')`
        bytes32 codehash;
        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
        // solhint-disable-next-line no-inline-assembly
        assembly { codehash := extcodehash(account) }
        return (codehash != accountHash && codehash != 0x0);
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return _functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        return _functionCallWithValue(target, data, value, errorMessage);
    }

    function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: weiValue }(data);
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

File 7 of 9 : IERC20.sol
pragma solidity ^0.8.0;

/**
 * @title Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);

    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
    function decimals() external view returns (uint8);
    function balanceOf(address account) external view returns (uint256);
    function transfer(address recipient, uint256 amount) external returns (bool);
    function approve(address spender, uint256 amount) external returns (bool);
    function allowance(address owner, address spender) external view returns (uint256);
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
    function totalSupply() external view returns (uint256);

    function increaseAllowance(address spender, uint256 addedValue) external returns (bool);
    function decreaseAllowance(address spender, uint256 subtractedValue) external returns (bool);

    function mint(address to, uint256 amount) external;
    function burn(uint256 amount) external;

    function deposit() external payable;
}

File 8 of 9 : SafeERC20.sol
pragma solidity ^0.8.0;

import "./IERC20.sol";
import "../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        // solhint-disable-next-line max-line-length
        require((value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender) - value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

File 9 of 9 : 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) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

Settings
{
  "remappings": [
    "@openzeppelin/contracts/=lib/openzeppelin-contracts/contracts/",
    "ds-test/=lib/forge-std/lib/ds-test/src/",
    "erc4626-tests/=lib/openzeppelin-contracts/lib/erc4626-tests/",
    "forge-std/=lib/forge-std/src/",
    "openzeppelin-contracts/=lib/openzeppelin-contracts/",
    "solmate/=lib/solmate/src/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 10000
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "shanghai",
  "viaIR": false,
  "libraries": {}
}

Contract Security Audit

Contract ABI

[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"receiver","type":"address"},{"indexed":false,"internalType":"address","name":"token","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"FlashLoan","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"oldLimit","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"newLimit","type":"uint256"}],"name":"MaxFlashLimitUpdated","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":false,"internalType":"address","name":"oldTreasury","type":"address"},{"indexed":false,"internalType":"address","name":"newTreasury","type":"address"}],"name":"TreasuryUpdated","type":"event"},{"inputs":[],"name":"CALLBACK_SUCCESS","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_token","type":"address"}],"name":"collect","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"dola","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"fee","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_token","type":"address"},{"internalType":"uint256","name":"","type":"uint256"}],"name":"flashFee","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"contract IERC3156FlashBorrower","name":"receiver","type":"address"},{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"flashLoan","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"flashMinted","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"maxFlashLimit","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_token","type":"address"}],"name":"maxFlashLoan","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_newLimit","type":"uint256"}],"name":"setMaxFlashLimit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_newTreasury","type":"address"}],"name":"setTreasury","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"treasury","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"stateMutability":"payable","type":"receive"}]

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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.