ETH Price: $3,095.10 (+0.74%)
Gas: 4 Gwei

Contract

0x86511a289585a170c4d8d0F4c44Bb4CE748397AD
 

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0 ETH

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$0.00

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From
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Swap Native Toke...114051932020-12-07 10:47:271311 days ago1607338047IN
0x86511a28...E748397AD
0 ETH0.0067955571
Swap Native Toke...112553502020-11-14 10:42:161334 days ago1605350536IN
0x86511a28...E748397AD
0 ETH0.0083269487.00000145
Swap Native Toke...112482012020-11-13 8:08:581335 days ago1605254938IN
0x86511a28...E748397AD
0 ETH0.0019660467
Deposit112356742020-11-11 10:05:071337 days ago1605089107IN
0x86511a28...E748397AD
0 ETH0.0019959274
Deposit112356742020-11-11 10:05:071337 days ago1605089107IN
0x86511a28...E748397AD
0 ETH0.0017801566
Deposit112356742020-11-11 10:05:071337 days ago1605089107IN
0x86511a28...E748397AD
0 ETH0.0016992363
Deposit112356742020-11-11 10:05:071337 days ago1605089107IN
0x86511a28...E748397AD
0 ETH0.0016183260
Deposit112356742020-11-11 10:05:071337 days ago1605089107IN
0x86511a28...E748397AD
0 ETH0.0016183260
Deposit112356732020-11-11 10:05:001337 days ago1605089100IN
0x86511a28...E748397AD
0 ETH0.0016183260
Withdraw112354342020-11-11 9:14:051337 days ago1605086045IN
0x86511a28...E748397AD
0 ETH0.001574166
Withdraw112354342020-11-11 9:14:051337 days ago1605086045IN
0x86511a28...E748397AD
0 ETH0.0014548561
Swap Native Toke...112354342020-11-11 9:14:051337 days ago1605086045IN
0x86511a28...E748397AD
0 ETH0.0017606460
Withdraw112354272020-11-11 9:12:231337 days ago1605085943IN
0x86511a28...E748397AD
0 ETH0.00143160
Deposit112126182020-11-07 21:05:371340 days ago1604783137IN
0x86511a28...E748397AD
0 ETH0.0027287470
Deposit112015512020-11-06 4:17:161342 days ago1604636236IN
0x86511a28...E748397AD
0 ETH0.0016430961
Deposit112015512020-11-06 4:17:161342 days ago1604636236IN
0x86511a28...E748397AD
0 ETH0.0015656558.12500127
Deposit112015512020-11-06 4:17:161342 days ago1604636236IN
0x86511a28...E748397AD
0 ETH0.0015999959.4
Swap Native Toke...111966062020-11-05 10:14:501343 days ago1604571290IN
0x86511a28...E748397AD
0 ETH0.0021421173
Swap Native Toke...111966062020-11-05 10:14:501343 days ago1604571290IN
0x86511a28...E748397AD
0 ETH0.0019073665
Swap Native Toke...111817342020-11-03 3:20:251345 days ago1604373625IN
0x86511a28...E748397AD
0 ETH0.0029430940.7
Swap Native Toke...111812442020-11-03 1:36:551345 days ago1604367415IN
0x86511a28...E748397AD
0 ETH0.0017899861
Swap Native Toke...111812442020-11-03 1:36:551345 days ago1604367415IN
0x86511a28...E748397AD
0 ETH0.001936766
Swap Native Toke...111812442020-11-03 1:36:551345 days ago1604367415IN
0x86511a28...E748397AD
0 ETH0.0023475280
Swap Native Toke...111812442020-11-03 1:36:551345 days ago1604367415IN
0x86511a28...E748397AD
0 ETH0.0023475280
Swap Native Toke...111812442020-11-03 1:36:551345 days ago1604367415IN
0x86511a28...E748397AD
0 ETH0.0023475280
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Contract Source Code Verified (Exact Match)

Contract Name:
NativeSwap

Compiler Version
v0.6.12+commit.27d51765

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, MIT license
/**
 *Submitted for verification at Etherscan.io on 2020-11-02
*/

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @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);
}

// File: @openzeppelin/contracts/math/SafeMath.sol



pragma solidity ^0.6.0;

/**
 * @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) {
        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;
    }
}

// File: contracts/interfaces/IToken.sol



pragma solidity ^0.6.0;

interface IToken {
    function mint(address to, uint256 amount) external;

    function burn(address from, uint256 amount) external;
}

// File: contracts/interfaces/IAuction.sol



pragma solidity ^0.6.0;

interface IAuction {
    function callIncomeDailyTokensTrigger(uint256 amount) external;

    function callIncomeWeeklyTokensTrigger(uint256 amount) external;
}

// File: contracts/NativeSwap.sol



pragma solidity >=0.4.25 <0.7.0;





contract NativeSwap {
    using SafeMath for uint256;

    event TokensSwapped(
        address indexed account,
        uint256 indexed stepsFromStart,
        uint256 userAmount,
        uint256 penaltyAmount
    );

    uint256 public start;
    uint256 public period;
    uint256 public stepTimestamp;
    IERC20 public swapToken;
    IToken public mainToken;
    IAuction public auction;

    bool public init_;

    mapping(address => uint256) public swapTokenBalanceOf;

    constructor() public {
        init_ = false;
    }

    function init(
        uint256 _period,
        uint256 _stepTimestamp,
        address _swapToken,
        address _mainToken,
        address _auction
    ) external {
        require(!init_, "init is active");
        period = _period;
        stepTimestamp = _stepTimestamp;
        swapToken = IERC20(_swapToken);
        mainToken = IToken(_mainToken);
        auction = IAuction(_auction);
        start = now;
        init_ = true;
    }

    function deposit(uint256 _amount) external {
        require(
            swapToken.transferFrom(msg.sender, address(this), _amount),
            "NativeSwap: transferFrom error"
        );
        swapTokenBalanceOf[msg.sender] = swapTokenBalanceOf[msg.sender].add(
            _amount
        );
    }

    function withdraw(uint256 _amount) external {
        require(_amount >= swapTokenBalanceOf[msg.sender], "balance < amount");
        swapTokenBalanceOf[msg.sender] = swapTokenBalanceOf[msg.sender].sub(
            _amount
        );
        swapToken.transfer(msg.sender, _amount);
    }

    function swapNativeToken() external {
        uint256 stepsFromStart = calculateStepsFromStart();
        require(stepsFromStart <= period, "swapNativeToken: swap is over");
        uint256 amount = swapTokenBalanceOf[msg.sender];
        uint256 deltaPenalty = calculateDeltaPenalty(amount);
        uint256 amountOut = amount.sub(deltaPenalty);
        require(amount > 0, "swapNativeToken: amount == 0");
        swapTokenBalanceOf[msg.sender] = 0;
        mainToken.mint(address(auction), deltaPenalty);
        auction.callIncomeDailyTokensTrigger(deltaPenalty);
        mainToken.mint(msg.sender, amountOut);

        emit TokensSwapped(msg.sender, stepsFromStart, amount, deltaPenalty);
    }

    function calculateDeltaPenalty(uint256 amount)
        public
        view
        returns (uint256)
    {
        uint256 stepsFromStart = calculateStepsFromStart();
        if (stepsFromStart > period) return amount;
        return amount.mul(stepsFromStart).div(period);
    }

    function calculateStepsFromStart() public view returns (uint256) {
        return now.sub(start).div(stepTimestamp);
    }
}

Contract Security Audit

Contract ABI

[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"account","type":"address"},{"indexed":true,"internalType":"uint256","name":"stepsFromStart","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"userAmount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"penaltyAmount","type":"uint256"}],"name":"TokensSwapped","type":"event"},{"inputs":[],"name":"auction","outputs":[{"internalType":"contract IAuction","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"calculateDeltaPenalty","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"calculateStepsFromStart","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"deposit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_period","type":"uint256"},{"internalType":"uint256","name":"_stepTimestamp","type":"uint256"},{"internalType":"address","name":"_swapToken","type":"address"},{"internalType":"address","name":"_mainToken","type":"address"},{"internalType":"address","name":"_auction","type":"address"}],"name":"init","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"init_","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"mainToken","outputs":[{"internalType":"contract IToken","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"period","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"start","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"stepTimestamp","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"swapNativeToken","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"swapToken","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"swapTokenBalanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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Swarm Source

ipfs://65125865350faf1f0e9ee89174c8c56bab6e96b5b0f7c83dce1ab82ee103d024

Block Transaction Difficulty Gas Used Reward
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Block Uncle Number Difficulty Gas Used Reward
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Validator Index Block Amount
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Transaction Hash Block Value Eth2 PubKey Valid
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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.