Contract 0x3645490a950F34D5bBaA53a1557892094538f19A 1

 

Contract Overview

Balance:
0 MATIC

MATIC Value:
$0.00

Token:
 
Txn Hash Method
Block
From
To
Value [Txn Fee]
0x1f0b9368db053b74fe3bb065492aec74486e307d7b130a914739922065c8184dEnd302336972022-07-02 1:07:5194 days 8 hrs ago0x698c390d07fc3b03208ffca214acfde882f71936 IN  0x3645490a950f34d5bbaa53a1557892094538f19a0 MATIC0.00720466669 48.791940256
0xac41375b611d46adc248de9b1524f852f5d26e3f1156755666867eb249f2b98bStart288525282022-05-28 0:21:20129 days 9 hrs ago0x6e3da1ac6aae91edba9a5270c86dda207972a4cb IN  0x3645490a950f34d5bbaa53a1557892094538f19a0 MATIC0.003549853724 30.070000124
0x6062193ff373a04fed4dd06b2e5588dd150e02a8be86f5b47e92a52bc47c7c82End288468282022-05-27 21:03:02129 days 12 hrs ago0x3fbb6884d75ae41a76406e05bf11fa25313c1742 IN  0x3645490a950f34d5bbaa53a1557892094538f19a0 MATIC0.004947961939 33.511652229
0xf7c951d6d48d6e8984ca0143e86352158607efbae297c10321efb581cdb275f4End287620502022-05-25 18:24:21131 days 15 hrs ago0x1e0cf598f3ffcba2eb84518029ed884bd6e411f6 IN  0x3645490a950f34d5bbaa53a1557892094538f19a0 MATIC0.005362210363 36.314330553
0x68389ce3c6e2e64bbf35849440c1f79359ecde6a126a3292695c897ccbd3315dEnd287620052022-05-25 18:22:47131 days 15 hrs ago0x1e0cf598f3ffcba2eb84518029ed884bd6e411f6 IN  0x3645490a950f34d5bbaa53a1557892094538f19a0 MATIC0.005526659495 37.431066216
0x8bf5b8115d9558729c68ee920366cde4fa41e4421ae32ae604ae27f033d617c8Start285754702022-05-21 4:51:18136 days 4 hrs ago0x0b15d955cc1b10da46cb81c4fb2d8dcb82ce8ee5 IN  0x3645490a950f34d5bbaa53a1557892094538f19a0 MATIC0.004396293719 37.239999997
0xf0b14532f5c0a8d24da6c4a46ccc0a42721ee23c4f780d476a5a071550815a8aStart284004042022-05-16 19:24:01140 days 14 hrs ago0x3b9ad02e5c3c166916daa5d970627891de48c064 IN  0x3645490a950f34d5bbaa53a1557892094538f19a0 MATIC0.006597063872 62.38181302
0x03f545030efd4f0031ffb3d8a5f8f67a6ebb01797545a57eeddfc6f9e9198914Start282438512022-05-12 22:24:19144 days 11 hrs ago0x3b9ad02e5c3c166916daa5d970627891de48c064 IN  0x3645490a950f34d5bbaa53a1557892094538f19a0 MATIC0.015210117668 137.582134073
0x4e743bbe14333ea1bcc4651427707207e3a5fe84f635d3c5096f4899a8c675eeStart282438112022-05-12 22:22:55144 days 11 hrs ago0x3b9ad02e5c3c166916daa5d970627891de48c064 IN  0x3645490a950f34d5bbaa53a1557892094538f19a0 MATIC0.015094426526 118.245764113
0x9a707cde3471b4a9ab9b8a93c4f73cbb7bec8aa64ca2d049389c42af8c469853Start280134272022-05-07 1:40:41150 days 7 hrs ago0xc46e9c793bb3d82834d9e2df6ca4426e6e90cd24 IN  0x3645490a950f34d5bbaa53a1557892094538f19a0 MATIC0.003175862581 30.030945517
0x129b45ab67ef4a631b410dbfa54a6d9b90cf1327c8b61d561e0c2e1a36006fc2Start279978942022-05-06 16:29:04150 days 17 hrs ago0x4f62dbc622c318cdf835e54cd7af682b9724fef9 IN  0x3645490a950f34d5bbaa53a1557892094538f19a0 MATIC0.023214749054 181.875330458
0x46c3884f869920b27331fcc2ec3055c537bb148659bbce8db430714188b3e5e4Start278474142022-05-02 20:14:15154 days 13 hrs ago0x1e0cf598f3ffcba2eb84518029ed884bd6e411f6 IN  0x3645490a950f34d5bbaa53a1557892094538f19a0 MATIC0.004422120001 40.000000012
0xb7f3ddb2e8cebe44ca5c302a9cf6d8ee629aeebfbe5f03b18c3925e206bfa74dStart277862742022-05-01 7:05:04156 days 2 hrs ago0xbdb44e5abeaedbf98dea347dd9f62a98985797aa IN  0x3645490a950f34d5bbaa53a1557892094538f19a0 MATIC0.003196042878 30.225200052
0x64c4db0c217ef3a233ce38f761232eaf4bd18e846fb7840578b7047126133f4aStart274857512022-04-23 15:42:48163 days 17 hrs ago0xb4ed9ba644e3c98f3a3f4933376d11a9fa751c21 IN  0x3645490a950f34d5bbaa53a1557892094538f19a0 MATIC0.0031796315630.069997069
0x36226ad1399f32f05ab2dd3317f8b3a2f6cbe5f5d5e0f724b97db17c8347909cEnd273320852022-04-19 17:45:44167 days 15 hrs ago0x53b57f9e81d8c62e7ae7bbd31838c82959463752 IN  0x3645490a950f34d5bbaa53a1557892094538f19a0 MATIC0.006157492 41.70358079
0xb8a86b055812206587935566c7bfeff7f7eeaa28822776c97d8f127fbde5559eEnd273320612022-04-19 17:44:56167 days 15 hrs ago0x53b57f9e81d8c62e7ae7bbd31838c82959463752 IN  0x3645490a950f34d5bbaa53a1557892094538f19a0 MATIC0.006536567037 44.267389747
0xd313c0749928f31a9bd29e8046d8e86fefb5cb2aab6176fb49f5285cd8630838End273320382022-04-19 17:44:10167 days 15 hrs ago0x53b57f9e81d8c62e7ae7bbd31838c82959463752 IN  0x3645490a950f34d5bbaa53a1557892094538f19a0 MATIC0.008080815965 54.725458756
0x56e2d8aec0d72f6b3c0074ccbf9f251684677ac5f6890bf6187216d4e1012c0fStart272024932022-04-16 11:01:29170 days 22 hrs ago0x3fbb6884d75ae41a76406e05bf11fa25313c1742 IN  0x3645490a950f34d5bbaa53a1557892094538f19a0 MATIC0.003686470751 30.010100465
0xbecd36ffe305e9f2cb45dbd5dc8f870b446084079dec0992fe18ed1600e7726dStart271732442022-04-15 16:48:25171 days 16 hrs ago0xb24bc05b17b4a55aed801b89c4d958accd5841c2 IN  0x3645490a950f34d5bbaa53a1557892094538f19a0 MATIC0.004381755948 37.11685386
0xf9456e007c7525daff0c563f1ed20c89760bc4725298a49387e1f8b30ccfc0f0Start271049992022-04-13 23:11:15173 days 10 hrs ago0x698c390d07fc3b03208ffca214acfde882f71936 IN  0x3645490a950f34d5bbaa53a1557892094538f19a0 MATIC0.003468025499 31.369799999
0x320076e2f2b5eda90b59f816eee3ce12c4e88e01cad07a7bff19ab124f9415d8End271049022022-04-13 23:07:57173 days 10 hrs ago0x698c390d07fc3b03208ffca214acfde882f71936 IN  0x3645490a950f34d5bbaa53a1557892094538f19a0 MATIC0.005064772302 34.300000014
0x50d078a68c62da1be7eae91100c88ea2f6cf2e7facf64c970cb12f96f889a046Start270818082022-04-13 9:01:53174 days 35 mins ago0x1e0cf598f3ffcba2eb84518029ed884bd6e411f6 IN  0x3645490a950f34d5bbaa53a1557892094538f19a0 MATIC0.003686458261 30.009998792
0x175662f115bfab7cb52af360c398dd818a795318a3556f8724c189592f130951Start270553622022-04-12 17:05:39174 days 16 hrs ago0x2717a5086b3b4c91f4761f9d5f8eaca3594f4ca0 IN  0x3645490a950f34d5bbaa53a1557892094538f19a0 MATIC0.00317539819 30.026554241
0x565dbcc82045342f92f0ea15504a96544078a058fe2a98f92768b0e7ea17ac73Start269525812022-04-10 2:51:14177 days 6 hrs ago0x3c2581198ed9c6330f6f219eb505d371830862ea IN  0x3645490a950f34d5bbaa53a1557892094538f19a0 MATIC0.003179992709 30.069999991
0xf916791eb675a2af0a3dc4217517cfd086d6f19d0d4d73a11a483e4ba2ba928fStart268215772022-04-06 17:37:01180 days 16 hrs ago0x6bb5647fdb9e7a8948ff6dece6d837c96da82b17 IN  0x3645490a950f34d5bbaa53a1557892094538f19a0 MATIC0.005815755 55
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0xbeeef82c67bc713e7144449d7aa2b0d994ea71886fb4ba5801803163fe1438a5237015572022-01-14 7:36:14263 days 2 hrs ago 0x7e380b13fabf7f176cef62e3b1a00e3016bda779  Contract Creation0 MATIC
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Similar Match Source Code
Note: This contract matches the deployed ByteCode of the Source Code for Contract 0xb81B3e9B7d809b2F38CB9872238DD2DF2cC246E9

Contract Name:
Stakes

Compiler Version
v0.8.7+commit.e28d00a7

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity)

/**
 *Submitted for verification at polygonscan.com on 2021-11-05
*/

// 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;
    }

}

Contract Security Audit

Contract ABI

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Swarm Source

ipfs://7f1806e472ea354d55b5eb3d31b8bb6951232bfd69d6960d7948fc6cac1b01e6
Block Transaction Gas Used Reward
Age Block Fee Address BC Fee Address Voting Power Jailed Incoming
Block Uncle Number Difficulty Gas Used Reward
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