Contract Source Code (Solidity)

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Outline

•    - function _msgSender()
•    - function _msgData()
•    - function owner()
•    - function _checkOwner()
•    - function renounceOwnership()
•    - function transferOwnership(address ne ...
•    - function _transferOwnership(address n ...
• interface IERC20
•    - function totalSupply()
•    - function balanceOf(address account)
•    - function transfer(address to, uint256 ...
•    - function allowance(address owner, add ...
•    - function approve(address spender, uin ...
•    - function transferFrom(address from, a ...
• interface USDT_IERC20
•    - function transferFrom(address from, a ...
•    - function transfer(address to, uint256 ...
•  contract Presale is Ownable *
•    - function buyTokens(uint256 weiAmountU ...
•    - function startstopPresale(bool state)
•    - function changePrice(uint256 _price)
•    - function changeToken(address _token)
•    - function changeUSDT(address _USDTtoke ...
•    - function changeMinimumLimits(uint256 ...
•    - function transferTokens(uint256 _valu ...
•    - function transferUSDT(uint256 _value)

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/**
 *Submitted for verification at Etherscan.io on 2023-07-15
*/

// SPDX-License-Identifier: MIT
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;
    }
}

// File: @openzeppelin/contracts/access/Ownable.sol


// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol)

pragma solidity ^0.8.0;


/**
 * @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 Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

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

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling 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);
    }
}

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol


// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 amount) external returns (bool);
}

// File: contracts/4_Presale.sol


pragma solidity ^0.8.0;



interface USDT_IERC20 {
    function transferFrom(address from, address to, uint256 amount) external;

    function transfer(address to, uint256 value) external;
}

contract Presale is Ownable {
    address public tokenAddress = 0xE187d7175756d806b7417B68dAd794bd43795F7d;
    address public USDTAddress = 0xdAC17F958D2ee523a2206206994597C13D831ec7;

    uint256 public tokenPerUSDT = 125 * 10 ** 11; // 12.5 Token = 1 USDT
    uint256 public minBuyUSDT = 1 * 10 ** 6; // Min buy 100 USDT

    uint256 public amountRaisedUSDT;
    bool public presaleStatus = true;

    function buyTokens(uint256 weiAmountUSDT) public {
        require(presaleStatus, "Presale is finished");
        require(weiAmountUSDT >= minBuyUSDT, "Minimal amount is not reached");

        USDT_IERC20 USDT = USDT_IERC20(USDTAddress);
        USDT.transferFrom(msg.sender, address(this), weiAmountUSDT);

        uint256 tokenAmount = weiAmountUSDT * tokenPerUSDT;
        amountRaisedUSDT = amountRaisedUSDT + (weiAmountUSDT);

        IERC20 token = IERC20(tokenAddress);
        token.transfer(msg.sender, tokenAmount);
    }

    function startstopPresale(bool state) external onlyOwner {
        presaleStatus = state;
    }

    function changePrice(uint256 _price) external onlyOwner {
        tokenPerUSDT = _price;
    }

    function changeToken(address _token) external onlyOwner {
        tokenAddress = _token;
    }

    function changeUSDT(address _USDTtoken) external onlyOwner {
        USDTAddress = _USDTtoken;
    }

    function changeMinimumLimits(uint256 _minBuyUSDT) external onlyOwner {
        minBuyUSDT = _minBuyUSDT;
    }

    function transferTokens(uint256 _value) external onlyOwner {
        IERC20 token = IERC20(tokenAddress);
        token.transfer(msg.sender, _value);
    }

    function transferUSDT(uint256 _value) external onlyOwner {
        USDT_IERC20 USDT = USDT_IERC20(USDTAddress);
        USDT.transfer(msg.sender, _value);
    }
}

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