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Yes

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Include nightly builds

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Yes

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EVM Version

Optimization

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Yes

Optimization runs

Enter the Solidity Contract Code

pragma solidity ^0.5.16;

/**
 * @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.
     *
     * _Available since v2.4.0._
     */
    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.
     *
     * _Available since v2.4.0._
     */
    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.
     *
     * _Available since v2.4.0._
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

interface TokenInterface {
    function decimals() external view returns (uint);
    function allowance(address, address) external view returns (uint);
    function balanceOf(address) external view returns (uint);
    function approve(address, uint) external;
    function transfer(address, uint) external returns (bool);
    function transferFrom(address, address, uint) external returns (bool);
    function deposit() external payable;
    function withdraw(uint) external;
}

contract ETHUSD {
    function read() external view returns (bytes32);
}

contract BetEthPrice {
    using SafeMath for uint256;

struct Bet {
        uint256 betCoef;
        uint256 amountUsd;
    }

mapping(address => Bet) public betsHighPrice;
    mapping(address => Bet) public betsLowPrice;

bool public isExistsBetsHighPrice;
    bool public isExistsBetsLowPrice;

ETHUSD public oracleUsd;
    TokenInterface public usdToken;

uint256 public targetPrice;
    uint256 public endTime;

bool public isFinalized;
    bool public isCanceled;

bool public isHighPriceWin;

uint256 public totalHighPriceCoef;
    uint256 public totalLowPriceCoef;

uint256 public finalBalance;

// TODO: params
    constructor() public {
        oracleUsd = ETHUSD(0x729D19f657BD0614b4985Cf1D82531c67569197B);  // MainNet Medianizer MakerDao (pip): 0x729D19f657BD0614b4985Cf1D82531c67569197B
        usdToken = TokenInterface(0xdAC17F958D2ee523a2206206994597C13D831ec7);  // MainNet USDT: 0xdAC17F958D2ee523a2206206994597C13D831ec7

targetPrice = 70 * 1e18;  // equals 80.000 eth (1e18) – price should multiple of 10
        endTime = 1588291200;  // 01.05.2020 @ 12:00am (UTC)
    }

function betOnHighPrice(uint256 amount) public {
        _bet(msg.sender, amount, true);
    }

function betOnHighPrice(address beneficiary, uint256 amount) public {
        _bet(beneficiary, amount, true);
    }

function betOnLowPrice(uint256 amount) public {
        _bet(msg.sender, amount, false);
    }

function betOnLowPrice(address beneficiary, uint256 amount) public {
        _bet(beneficiary, amount, false);
    }

// finalize Betting (time is over or price is lower than targetPrice)
    function finalize() public {
        require(!isFinalized, "Have already finilized");

bool isLowWin = (getCurPriceUsd() <= targetPrice);
        bool isHighWin = (!isLowWin && (now >= endTime));
        require(isLowWin || isHighWin, "Betting is active");

// set win bets
        isHighPriceWin = isHighWin;

// if no winners – cancel betting
        if ((isHighWin && !isExistsBetsHighPrice)
         || (!isHighWin && !isExistsBetsLowPrice)) {
            isCanceled = true;
            return;
        }

finalBalance = usdToken.balanceOf(address(this));
        isFinalized = true;
    }

function withdrawPrize() public  {
        require(isFinalized, "Betting is active or cancel");

uint256 amount = 0;
        if (isHighPriceWin) {
            amount = finalBalance.mul(betsHighPrice[msg.sender].betCoef).div(totalHighPriceCoef);

// set user's betCoef state as 0
            betsHighPrice[msg.sender].betCoef = 0;
        } else {
            amount = finalBalance.mul(betsLowPrice[msg.sender].betCoef).div(totalLowPriceCoef);

// set user's betCoef state as 0
            betsLowPrice[msg.sender].betCoef = 0;
        }

// transfer prize to user
        usdToken.transfer(msg.sender, amount);
    }

function withdrawCanceled() public {
        require(isCanceled, "Betting is not canceled");

// transfer user's bet to user
        usdToken.transfer(msg.sender, betsLowPrice[msg.sender].amountUsd.add(betsHighPrice[msg.sender].amountUsd));
    }

// **VIEW functions**

// function getUsdtBalance() public view returns(uint256 usdtBalance) {
    //     usdtBalance = usdToken.balanceOf(address(this));
    // }

function getCurPriceUsd() public view returns(uint256) {
        return uint256(oracleUsd.read());  // USD price call to MakerDao Oracles – Medianizer contract
    }

function getTimeLeft() public view returns(uint256) {
        uint256 curEndTime = endTime;
        if (curEndTime > now) {
            return curEndTime - now;
        }

return 0;
    }

// **INTERNAL functions**

function _bet(address beneficiary, uint256 amount, bool isHighPrice) internal {
        require(now < endTime, "Betting time is over");
        require(amount > 0, "USD should be more than 0");

// transfer USD from msg.sender to this contract
        usdToken.transferFrom(msg.sender, address(this), amount);

uint256 priceUsd = getCurPriceUsd();
        uint256 timeLeft = getTimeLeft();
        uint256 curBetCoef = 0;

if (isHighPrice) {
            curBetCoef = amount.mul(timeLeft).mul(1e21).div(priceUsd);  // amount * timeLeft / priceUsd

// set states
            betsHighPrice[beneficiary].betCoef = betsHighPrice[beneficiary].betCoef.add(curBetCoef);
            totalHighPriceCoef = totalHighPriceCoef.add(curBetCoef);

betsHighPrice[beneficiary].amountUsd = betsHighPrice[beneficiary].amountUsd.add(amount);
        } else {
            curBetCoef = amount.mul(timeLeft).mul(priceUsd).div(1e18);  // amount * timeLeft * priceUsd

// set states
            betsLowPrice[beneficiary].betCoef = betsLowPrice[beneficiary].betCoef.add(curBetCoef);
            totalLowPriceCoef = totalLowPriceCoef.add(curBetCoef);

betsLowPrice[beneficiary].amountUsd = betsLowPrice[beneficiary].amountUsd.add(amount);
        }

// if no betters
        if (!isExistsBetsHighPrice && isHighPrice) {
            isExistsBetsHighPrice = true;
        } else if (!isExistsBetsLowPrice && !isHighPrice) {
            isExistsBetsLowPrice = true;
        }
    }
}

Try to fetch constructor arguments automatically

No

Yes

ABI-encoded Constructor Arguments (if required by the contract)

New Solidity Smart Contract Verification

Contract Libraries