Contract 0xBf64ac6d2147b05326E01aE74CC8c6b477204b35

 

Contract Overview

Balance:
0 BNB

BNB Value:
$0.00

Token:
 
Txn Hash Method
Block
From
To
Value [Txn Fee]
0x25df842c26f52cd1fd67634db0a4107e644c69d20a2df2b5e99423316f9f41c9End131370052021-12-02 17:58:5218 hrs 26 mins ago0x5db45a8979852158d7b328b2688fc4b1af0f6880 IN  0xbf64ac6d2147b05326e01ae74cc8c6b477204b350 BNB0.00249164
0xd1cebc5c38504558810fd89d7903b9bd353e827858572aa154e2d24e34dfa245End131352282021-12-02 16:29:4619 hrs 55 mins ago0xc03250b1cf46fc5969f3ec08d1a949c64b350d13 IN  0xbf64ac6d2147b05326e01ae74cc8c6b477204b350 BNB0.00249164
0xf16ef148b09016a11bdc119775e4caa9b79bad041e461776f2eeeb4f81f2a580End131125792021-12-01 20:49:591 day 15 hrs ago0xbd371d8035690c013e5d186781b13dfdc85df9b4 IN  0xbf64ac6d2147b05326e01ae74cc8c6b477204b350 BNB0.00249164
0x478f5d91cdf7b65b1c239717874b2089c3dc3206b961f0b27efc4677686f7d51End131089762021-12-01 17:45:541 day 18 hrs ago0xeeb413ce71f0f8506d1b62a57f83ff9211d98f64 IN  0xbf64ac6d2147b05326e01ae74cc8c6b477204b350 BNB0.00249158
0x42619e89e2adf4397f83efa8f7bfba0962ca31774e04f5f39ddf33ef218b12a7Start131048332021-12-01 14:01:171 day 22 hrs ago0x5eeef09de32988824d6b5d089ab546c8f74401c3 IN  0xbf64ac6d2147b05326e01ae74cc8c6b477204b350 BNB0.00129543876
0x8bba11d615cceb18259fa3af980a2c8048c41169b56f7c9bbe8c99f1da4ec27aEnd130913232021-12-01 1:24:412 days 11 hrs ago0x538b5c169469945d794ad3453c013e261d629182 IN  0xbf64ac6d2147b05326e01ae74cc8c6b477204b350 BNB0.00249164
0x161b6fe479c0db217c4a57d8a74b89163e472090f7e40abf8b40e63f5b7ead0aEnd130857622021-11-30 20:39:252 days 15 hrs ago0x5eeef09de32988824d6b5d089ab546c8f74401c3 IN  0xbf64ac6d2147b05326e01ae74cc8c6b477204b350 BNB0.00249164
0xd2eb89b7cfb696b8b09c4c86c6161c3646dff8983d7c13b976c9901713097040Start130852812021-11-30 20:15:182 days 16 hrs ago0xab7869470889763d5ff75b6f7c21d99dd7d5b49f IN  0xbf64ac6d2147b05326e01ae74cc8c6b477204b350 BNB0.00120956
0x9255d84d851915f582221c5bd136b643dd49fd65a3923a1949ee8e881a257c5fEnd130852592021-11-30 20:14:122 days 16 hrs ago0xab7869470889763d5ff75b6f7c21d99dd7d5b49f IN  0xbf64ac6d2147b05326e01ae74cc8c6b477204b350 BNB0.00249164
0x4908aa9a341e802eccb0ea65293cae83aeac34b498963667a3087c5ddcb2da0fEnd130852482021-11-30 20:13:392 days 16 hrs ago0xab7869470889763d5ff75b6f7c21d99dd7d5b49f IN  0xbf64ac6d2147b05326e01ae74cc8c6b477204b350 BNB0.00249164
0x709df5c70a84a1ad3d19414b372e70ca02c9c747c3204f2dea0b52e2d611b478End130680202021-11-30 4:59:493 days 7 hrs ago0x0d877dd9977dc4a62301be3b10d4502379fcd8b5 IN  0xbf64ac6d2147b05326e01ae74cc8c6b477204b350 BNB0.00249158
0x14e6415dfa346baa43570a78a72b61230d55a1626e65952e43aad0e8cc50608dEnd130675692021-11-30 4:34:203 days 7 hrs ago0xd19246f6adf6c0209423fd4931d38cd5c64ecf7a IN  0xbf64ac6d2147b05326e01ae74cc8c6b477204b350 BNB0.00249164
0xc2d0ebea6a476d21a476701e12612f9a3d3cae4572ddcd24e3e2d70c4098b19aStart130658612021-11-30 3:01:283 days 9 hrs ago0xe4379a25a0db888e19ec2c14416fe68a62aca5cc IN  0xbf64ac6d2147b05326e01ae74cc8c6b477204b350 BNB0.00135962
0x5a6bc29cafd50bb44fab01f77632081ad14ff15c7986a6b820851df0745068d9Start130542892021-11-29 16:33:093 days 19 hrs ago0x97ed3aae636cee17e241655a400474348c5248ff IN  0xbf64ac6d2147b05326e01ae74cc8c6b477204b350 BNB0.00120956
0x79b88a6cbe8a183c051cc1de6a3df8e39d5127aed5517a570c151fb9465c38c3End130542472021-11-29 16:31:013 days 19 hrs ago0x97ed3aae636cee17e241655a400474348c5248ff IN  0xbf64ac6d2147b05326e01ae74cc8c6b477204b350 BNB0.00249164
0x0c0fb74bbe24e6663aa3a393db84440ade083e63225238e173a2e19fc07b33adStart130541972021-11-29 16:28:313 days 19 hrs ago0xc03250b1cf46fc5969f3ec08d1a949c64b350d13 IN  0xbf64ac6d2147b05326e01ae74cc8c6b477204b350 BNB0.00120962
0x4d0e27f4f810f86a299fa88076cf142bde7ea9239cf133cdcc8eb923985465a8End130541002021-11-29 16:23:233 days 20 hrs ago0xc03250b1cf46fc5969f3ec08d1a949c64b350d13 IN  0xbf64ac6d2147b05326e01ae74cc8c6b477204b350 BNB0.00249164
0x2d9f31f3c0c15a57f9ee91cbffdd88f087e37ed9b0c868dacad00e380b2d44f1End130393212021-11-29 2:35:364 days 9 hrs ago0x39fd445ebb03bf6845478c73b65a78533927d70a IN  0xbf64ac6d2147b05326e01ae74cc8c6b477204b350 BNB0.00249158
0x7399881360e07ef5aed5539d8a3b12231b2c9af0a1d3bad3abca3cddb7018a04End130392892021-11-29 2:33:494 days 9 hrs ago0x39fd445ebb03bf6845478c73b65a78533927d70a IN  0xbf64ac6d2147b05326e01ae74cc8c6b477204b350 BNB0.00249164
0xde61bc84204aacd3fa57b54ab07847db8fa492843f66f44ebd43a3982d5c8b5bStart130370152021-11-29 0:30:544 days 11 hrs ago0x5db45a8979852158d7b328b2688fc4b1af0f6880 IN  0xbf64ac6d2147b05326e01ae74cc8c6b477204b350 BNB0.00120956
0x54f615b4d1a20dafc77d07e48a098936bdb944d5bc863f896ab493f0eafa80acEnd130369002021-11-29 0:24:314 days 12 hrs ago0x5db45a8979852158d7b328b2688fc4b1af0f6880 IN  0xbf64ac6d2147b05326e01ae74cc8c6b477204b350 BNB0.00249164
0xc9be8ed8afb305cbf89aeae37bcbece6917fe75b9af054cd0e01e03924a949bfEnd130224222021-11-28 11:21:505 days 1 hr ago0x7a0288df4f290273086fe141c042fdd83b17ccc5 IN  0xbf64ac6d2147b05326e01ae74cc8c6b477204b350 BNB0.00249164
0xa95072152c5a0d9701d5fdeb1ff26f13c94f0531b259576fab53c8dd58b3d270End130206682021-11-28 9:49:265 days 2 hrs ago0x303d76e6356ddaf2eaf96883d49f6cd8ab8d5319 IN  0xbf64ac6d2147b05326e01ae74cc8c6b477204b350 BNB0.00249158
0x1c16846b20039dc75bd3fd4e922edb4d15bfc8817b7607a050973e5009f56888End130190292021-11-28 8:24:535 days 4 hrs ago0xe6e2d162ba401574076b7ab434336797a8304b63 IN  0xbf64ac6d2147b05326e01ae74cc8c6b477204b350 BNB0.00249164
0x86193b0bb2289506a66985d81e7ba4aaa6508ba4f99cde53df597d8d65221444Start130075102021-11-27 22:08:525 days 14 hrs ago0x538b5c169469945d794ad3453c013e261d629182 IN  0xbf64ac6d2147b05326e01ae74cc8c6b477204b350 BNB0.00120956
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0x0a7147e8b27a4b97f42c489b5826c2728d24f9b58f492717c2320368e2892399124256502021-11-06 20:07:2326 days 16 hrs ago 0x1277269279435c36b434a6a1263a8947a022316b  Contract Creation0 BNB
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Similar Match Source Code
Note: This contract matches the deployed ByteCode of the Source Code for Contract 0x3566Ed1F82eBfB595fb873Cf2C5e28b66Ace59b7

Contract Name:
Stakes

Compiler Version
v0.8.9+commit.e5eed63a

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion

Contract Source Code (Solidity Standard Json-Input format)

File 1 of 1 : UbeFlattened.sol
// SPDX-License-Identifier: MIT

/**

MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM
MMMMMMMMMMMMMMMMMMMMMMMMMMMMWWWWWWWWWWWWWWWMMMMMMMMMMMMMMMMMMMMMMMMMMM
MMMMMMMMMMMMMMMMMMMMMMWWNXXKKKKKKKXXXXKKKKKKXXNWWMMMMMMMMMMMMMMMMMMMMM
MMMMMMMMMMMMMMMMMMWNXKKKKXXNWWWWMMWWWWMWWWWNXXXKKKXNWMMMMMMMMMMMMMMMMM
MMMMMMMMMMMMMMMWNXKKKXNWMMMMMMMMMNOdxKWMMMMMMMMWNXKKKXNWMMMMMMMMMMMMMM
MMMMMMMMMMMMMWXKKKNWMMMMMMMMMMMMNx:;;l0WMMMMMMMMMMMWNK0KXWMMMMMMMMMMMM
MMMMMMMMMMMWXKKXWMMMMMMMMMMMMMMXd:;;;;cOWMMMMMMMMMMMMMWXKKXWMMMMMMMMMM
MMMMMMMMMWNKKXWMMMMMMMMMMMMMMWKo;;col:;:kNMMMMMMMMMMMMMMWX0KNWMMMMMMMM
MMMMMMMMWX0XWMMMMMMMMMMMMMMMWOl;;oKWXkc;:dXMMMMMMMMMMMMMMMWX0XWMMMMMMM
MMMMMMMNKKNWMMMMMMMMMMMMMMMNkc;:dXMMMWOc;;oKWMMMMMMMMMMMMMMWNKKNMMMMMM
MMMMMMNKKNMMMMMMMMMMMMMMMMNx:;:xNMMMMMW0l;;l0WMMMMMMMWMMMMMMMNKKNMMMMM
MMMMMNKKNMMMMMMMMMMMMMMMMXd:;ckNMMMMMMMMKo:;cOWMMMMXkxkXWMMMMMNKKNMMMM
MMMMWK0NMMMMMMMMMMMMMMMWKo;;l0WMMMMMMMMMMXx:;:xNMMW0lccxXMMMMMMN0KWMMM
MMMMX0XWMMMMMMWWMMMMMMWOl;;oKWMMMMMMMMMMMMNkc;:dXMMNklcoKMMMMMMMX0XMMM
MMMWKKNMMWK0OkkkkkkKWNkc;:dXMMMMMMMMMMMMMMMWOl;;oKWMXdcxNMMMMMMMNKKWMM
MMMN0XWMMWNXX0OdlccdKOc;:xNMMMWXKKXNWNNNNWWMW0o;;l0WNkdKWMMMMMMMWX0NMM
MMMX0XMMMMMMMMMN0dlcdOxoONMMMMW0xdddddodxk0KNWXd:;l0Kx0WMMMMMMMMMX0XMM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:;cOWMWKo:;c0WMMMMMMMMMMMMMMWX0KNMMMMMMM
MMMMMMMMMWXKKNWMMMMMMMMMMMMMMXd:;cx0kl;;l0WMMMMMMMMMMMMMWNKKXWMMMMMMMM
MMMMMMMMMMMWX0KNWMMMMMMMMMMMMMNkc;;::;:oKWMMMMMMMMMMMMWNK0XWMMMMMMMMMM
MMMMMMMMMMMMMNXKKXNWMMMMMMMMMMMWOc;;;:dXMMMMMMMMMMMWNXKKXWMMMMMMMMMMMM
MMMMMMMMMMMMMMMWNKKKXNWMMMMMMMMMW0l:ckNMMMMMMMMMWNXKKKNWMMMMMMMMMMMMMM
MMMMMMMMMMMMMMMMMMWNXKKKXXNWWWMMMMX0KWMMMWWWNXXKKKXNWMMMMMMMMMMMMMMMMM
MMMMMMMMMMMMMMMMMMMMMWWNXXKKKKKXXXXXXXXXXKKKKXXNWWMMMMMMMMMMMMMMMMMMMM
MMMMMMMMMMMMMMMMMMMMMMMMMMMWWNNNNNNNNNNNNWWWMMMMMMMMMMMMMMMMMMMMMMMMMM
MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM


---------------------- [ WPSmartContracts.com ] ----------------------

                       [ Blockchain Made Easy ]


    |
    |  Stakes v.2
    |
    |----------------------------
    |
    |  Flavor
    |
    |  >  Ube: Fully featured ERC-20 Staking contract with maturity time 
    |          and an annual interest 
    |

*/

pragma solidity ^0.8.2;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

/**
 * @title Owner
 * @dev Set & change owner
 */
contract Owner {

    address private owner;
    
    // event for EVM logging
    event OwnerSet(address indexed oldOwner, address indexed newOwner);
    
    // modifier to check if caller is owner
    modifier isOwner() {
        // If the first argument of 'require' evaluates to 'false', execution terminates and all
        // changes to the state and to Ether balances are reverted.
        // This used to consume all gas in old EVM versions, but not anymore.
        // It is often a good idea to use 'require' to check if functions are called correctly.
        // As a second argument, you can also provide an explanation about what went wrong.
        require(msg.sender == owner, "Caller is not owner");
        _;
    }
    
    /**
     * @dev Set contract deployer as owner
     */
    constructor(address _owner) {
        owner = _owner;
        emit OwnerSet(address(0), owner);
    }

    /**
     * @dev Change owner
     * @param newOwner address of new owner
     */
    function changeOwner(address newOwner) public isOwner {
        emit OwnerSet(owner, newOwner);
        owner = newOwner;
    }

    /**
     * @dev Return owner address 
     * @return address of owner
     */
    function getOwner() public view returns (address) {
        return owner;
    }
}

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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 `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, 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 `sender` to `recipient` 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 sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    /**
     * @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 Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

/**
 * @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;
    }
}

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * The default value of {decimals} is 18. To select a different value for
     * {decimals} you should overload it.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless this function is
     * overridden;
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * Requirements:
     *
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);

        uint256 currentAllowance = _allowances[sender][_msgSender()];
        require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
        unchecked {
            _approve(sender, _msgSender(), currentAllowance - amount);
        }

        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue);
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        uint256 currentAllowance = _allowances[_msgSender()][spender];
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(_msgSender(), spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `sender` to `recipient`.
     *
     * This internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        uint256 senderBalance = _balances[sender];
        require(senderBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[sender] = senderBalance - amount;
        }
        _balances[recipient] += amount;

        emit Transfer(sender, recipient, amount);

        _afterTokenTransfer(sender, recipient, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        _balances[account] += amount;
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
        }
        _totalSupply -= amount;

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}
}

/**
 * 
 * Stakes is an interest gain contract for ERC-20 tokens
 * 
 * assets is the ERC20 token
 * interest_rate: percentage rate
 * maturity is the time in seconds after which is safe to end the stake
 * penalization for ending a stake before maturity time
 * lower_amount is the minimum amount for creating a stake
 * 
 */
contract Stakes is Owner, ReentrancyGuard {

    using SafeMath for uint256;

    // token    
    ERC20 public asset;

    // stakes history
    struct Record {
        uint256 from;
        uint256 amount;
        uint256 gain;
        uint256 penalization;
        uint256 to;
        bool ended;
    }

    // contract parameters
    uint8 public interest_rate;
    uint256 public maturity;
    uint8 public penalization;
    uint256 public lower_amount;

    mapping(address => Record[]) public ledger;

    event StakeStart(address indexed user, uint256 value, uint256 index);
    event StakeEnd(address indexed user, uint256 value, uint256 penalty, uint256 interest, uint256 index);
    
    constructor(ERC20 _erc20, address _owner, uint8 _rate, uint256 _maturity, uint8 _penalization, uint256 _lower) Owner(_owner) {
        require(_penalization<=100, "Penalty has to be an integer between 0 and 100");
        asset = _erc20;
        interest_rate = _rate;
        maturity = _maturity;
        penalization = _penalization;
        lower_amount = _lower;
    }
    
    function start(uint256 _value) external {
        require(_value >= lower_amount, "Invalid value");
        asset.transferFrom(msg.sender, address(this), _value);
        ledger[msg.sender].push(Record(block.timestamp, _value, 0, 0, 0, false));
        emit StakeStart(msg.sender, _value, ledger[msg.sender].length-1);
    }

    function end(uint256 i) external nonReentrant {

        require(i < ledger[msg.sender].length, "Invalid index");
        require(ledger[msg.sender][i].ended==false, "Invalid stake");
        
        // penalization
        if(block.timestamp.sub(ledger[msg.sender][i].from) < maturity) {
            uint256 _penalization = ledger[msg.sender][i].amount.mul(penalization).div(100);
            asset.transfer(msg.sender, ledger[msg.sender][i].amount.sub(_penalization));
            asset.transfer(getOwner(), _penalization);
            ledger[msg.sender][i].penalization = _penalization;
            ledger[msg.sender][i].to = block.timestamp;
            ledger[msg.sender][i].ended = true;
            emit StakeEnd(msg.sender, ledger[msg.sender][i].amount, _penalization, 0, i);
        // interest gained
        } else {
            uint256 _interest = get_gains(msg.sender, i);
            // check that the owner can pay interest before trying to pay
            if (asset.allowance(getOwner(), address(this)) >= _interest && asset.balanceOf(getOwner()) >= _interest) {
                asset.transferFrom(getOwner(), msg.sender, _interest);
            } else {
                _interest = 0;
            }
            asset.transfer(msg.sender, ledger[msg.sender][i].amount);
            ledger[msg.sender][i].gain = _interest;
            ledger[msg.sender][i].to = block.timestamp;
            ledger[msg.sender][i].ended = true;
            emit StakeEnd(msg.sender, ledger[msg.sender][i].amount, 0, _interest, i);
        }
    }

    function set(uint256 _lower, uint256 _maturity, uint8 _rate, uint8 _penalization) public isOwner {
        require(_penalization<=100, "Invalid value");
        lower_amount = _lower;
        maturity = _maturity;
        interest_rate = _rate;
        penalization = _penalization;
    }
    
    // calculate interest to the current date time
    function get_gains(address _address, uint256 _rec_number) public view returns (uint256) {
        uint256 _record_seconds = block.timestamp.sub(ledger[_address][_rec_number].from);
        uint256 _year_seconds = 365*24*60*60;
        return _record_seconds.mul(
            ledger[_address][_rec_number].amount.mul(interest_rate).div(100)
        ).div(_year_seconds);
    }

    function ledger_length(address _address) public view returns (uint256) {
        return ledger[_address].length;
    }

}

Settings
{
  "remappings": [],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "evmVersion": "london",
  "libraries": {},
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  }
}

Contract Security Audit

Contract ABI

[{"inputs":[{"internalType":"contract ERC20","name":"_erc20","type":"address"},{"internalType":"address","name":"_owner","type":"address"},{"internalType":"uint8","name":"_rate","type":"uint8"},{"internalType":"uint256","name":"_maturity","type":"uint256"},{"internalType":"uint8","name":"_penalization","type":"uint8"},{"internalType":"uint256","name":"_lower","type":"uint256"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"oldOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnerSet","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"penalty","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"interest","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"index","type":"uint256"}],"name":"StakeEnd","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"index","type":"uint256"}],"name":"StakeStart","type":"event"},{"inputs":[],"name":"asset","outputs":[{"internalType":"contract ERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"changeOwner","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"i","type":"uint256"}],"name":"end","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"getOwner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_address","type":"address"},{"internalType":"uint256","name":"_rec_number","type":"uint256"}],"name":"get_gains","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"interest_rate","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"uint256","name":"","type":"uint256"}],"name":"ledger","outputs":[{"internalType":"uint256","name":"from","type":"uint256"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"gain","type":"uint256"},{"internalType":"uint256","name":"penalization","type":"uint256"},{"internalType":"uint256","name":"to","type":"uint256"},{"internalType":"bool","name":"ended","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_address","type":"address"}],"name":"ledger_length","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"lower_amount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"maturity","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"penalization","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_lower","type":"uint256"},{"internalType":"uint256","name":"_maturity","type":"uint256"},{"internalType":"uint8","name":"_rate","type":"uint8"},{"internalType":"uint8","name":"_penalization","type":"uint8"}],"name":"set","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_value","type":"uint256"}],"name":"start","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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