Contract 0xbf2aB5811A78AB652185da3028eCB4F4b55f9e12

 

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0x8c1b8af6c2d67839c99b11dcab2a94d06ffffeaf99b16c7549ddebf5bc2d2a88Claim Reward74223882021-05-15 5:06:34154 days 7 hrs ago0x4add553376c24d6fcc61a063e63a75f091c9c6ae IN  0xbf2ab5811a78ab652185da3028ecb4f4b55f9e120 BNB0.00081346
0x1af1845324ae06dab207f260382ebb9759cf635bd162abed7b1df9514ac6c800Claim Reward74223792021-05-15 5:05:53154 days 7 hrs ago0x4add553376c24d6fcc61a063e63a75f091c9c6ae IN  0xbf2ab5811a78ab652185da3028ecb4f4b55f9e120 BNB0.00081346
0xf9cc8f5ff8659d0669ff1f33387210ded6e4f44a148b54f2694afb3c4e6671e4Claim Reward74191302021-05-15 2:10:37154 days 10 hrs ago0x45574c0f7ca5733b2d89c97e310902c2de5df805 IN  0xbf2ab5811a78ab652185da3028ecb4f4b55f9e120 BNB0.00081346
0xe5c37232a245bb6e1e29163685dd16ae5c4fe7c3c3bb887b67fbaddf08a6f0d0Participate74190922021-05-15 2:08:43154 days 10 hrs ago0x45574c0f7ca5733b2d89c97e310902c2de5df805 IN  0xbf2ab5811a78ab652185da3028ecb4f4b55f9e120 BNB0.00024486
0x64fe826d430795f708cccb91c64b00dfe0b6659a73dd245c55143d551c85faa3Participate74190592021-05-15 2:07:04154 days 10 hrs ago0x45574c0f7ca5733b2d89c97e310902c2de5df805 IN  0xbf2ab5811a78ab652185da3028ecb4f4b55f9e120 BNB0.00012243
0xea85d3d794648699b704e71bbfdaa61e6c7e10bf3a3dfa408285d94ef487687fClaim Reward74190112021-05-15 2:04:40154 days 10 hrs ago0x45574c0f7ca5733b2d89c97e310902c2de5df805 IN  0xbf2ab5811a78ab652185da3028ecb4f4b55f9e120 BNB0.00081346
0x75a413270bd9e477a7cd98b35c617cfd33f3b624e9c59bd74904b0f7864ed607Claim Reward74189902021-05-15 2:03:37154 days 10 hrs ago0x45574c0f7ca5733b2d89c97e310902c2de5df805 IN  0xbf2ab5811a78ab652185da3028ecb4f4b55f9e120 BNB0.00081346
0x342c5dfd55b28fccbeeff0cfd70589e566766a5b13f3b42464e86f48fff7f61cParticipate74189272021-05-15 2:00:28154 days 10 hrs ago0x45574c0f7ca5733b2d89c97e310902c2de5df805 IN  0xbf2ab5811a78ab652185da3028ecb4f4b55f9e120 BNB0.00012243
0x6ead1f916207fb9a63dceca2494e0a6b5fe458cb517a3cc6d61b023bbcb0f0b5Participate74188812021-05-15 1:58:10154 days 10 hrs ago0x45574c0f7ca5733b2d89c97e310902c2de5df805 IN  0xbf2ab5811a78ab652185da3028ecb4f4b55f9e120 BNB0.00012243
0x078b13be1e0f97874dd2c7693fc415596158b83dd2c923a9953c79c65affdb17Claim Reward74187972021-05-15 1:53:58154 days 10 hrs ago0xd7dea8b950df199b2b82fc23ae250c22419649b7 IN  0xbf2ab5811a78ab652185da3028ecb4f4b55f9e120 BNB0.00081346
0x7e5224584d887a9f5e2a3d8356092583c000dce96a98ae25687745487a81c2fdClaim Reward74182702021-05-15 1:27:34154 days 10 hrs ago0x10815e073a0083efa9851ce6d1951a5591be91c4 IN  0xbf2ab5811a78ab652185da3028ecb4f4b55f9e120 BNB0.00081346
0x3e802840fd612d2b0c6b09318a8409f647938598e9bdd0d7fd3bf1c7d712c7d8Claim Reward74182462021-05-15 1:26:22154 days 10 hrs ago0x10815e073a0083efa9851ce6d1951a5591be91c4 IN  0xbf2ab5811a78ab652185da3028ecb4f4b55f9e120 BNB0.00081346
0xf08e46df3d6bf01ce16491b09e77e066eadf132636a60ecaa5a1f20f409a9948Claim Reward74175852021-05-15 0:53:19154 days 11 hrs ago0x64b38bff5b1dcdf18c94a349293d4d0ce913487f IN  0xbf2ab5811a78ab652185da3028ecb4f4b55f9e120 BNB0.00081346
0x0d2ea40aed0696aeeecea787f50c15479fda3ee1a4dd60019b337ebd0ba7ae18Claim Reward74169112021-05-15 0:19:18154 days 12 hrs ago0x4b000ab7ab0a8905fdb6c21520f2a9fe53ec31e0 IN  0xbf2ab5811a78ab652185da3028ecb4f4b55f9e120 BNB0.00162692
0x70d54d46065c411246b156873474f4a8690b73aa73e6ec7a9925e10e90ac30ffClaim Reward74163462021-05-14 23:51:00154 days 12 hrs ago0x4b000ab7ab0a8905fdb6c21520f2a9fe53ec31e0 IN  0xbf2ab5811a78ab652185da3028ecb4f4b55f9e120 BNB0.00244038
0xa09858e3e26726cdc0be149d0f4f3d449484c8b08bab4b9fc31e219c5e326443Claim Reward74163182021-05-14 23:49:36154 days 12 hrs ago0x4b000ab7ab0a8905fdb6c21520f2a9fe53ec31e0 IN  0xbf2ab5811a78ab652185da3028ecb4f4b55f9e120 BNB0.007926555
0x597ee889aeb5f745fd5af165e470d4d46465615c13afd67bd55a029a7954e59eClaim Reward74161742021-05-14 23:42:24154 days 12 hrs ago0x4b000ab7ab0a8905fdb6c21520f2a9fe53ec31e0 IN  0xbf2ab5811a78ab652185da3028ecb4f4b55f9e120 BNB0.00244038
0xf1b1406d8b3069f9eed8a5552d199229c67515a20c639bcbd53897764d215186Claim Reward74161392021-05-14 23:40:39154 days 12 hrs ago0x4b000ab7ab0a8905fdb6c21520f2a9fe53ec31e0 IN  0xbf2ab5811a78ab652185da3028ecb4f4b55f9e120 BNB0.00244038
0x1d42989b208a4c3f99185b0a29bc6b950f23410ccee09030a1484f7650ae2164Claim Reward74159332021-05-14 23:30:21154 days 12 hrs ago0x4b000ab7ab0a8905fdb6c21520f2a9fe53ec31e0 IN  0xbf2ab5811a78ab652185da3028ecb4f4b55f9e120 BNB0.00244038
0x7d30234c00dca030590d4da26e037250a73d96b991309bf307a8f25ef3477a9dClaim Reward74159232021-05-14 23:29:51154 days 12 hrs ago0x4b000ab7ab0a8905fdb6c21520f2a9fe53ec31e0 IN  0xbf2ab5811a78ab652185da3028ecb4f4b55f9e120 BNB0.00244038
0xaf231409eb0054fa9662f9ed2689e0542e451691056d006b8eaede53d8083d96Claim Reward74159232021-05-14 23:29:51154 days 12 hrs ago0x4b000ab7ab0a8905fdb6c21520f2a9fe53ec31e0 IN  0xbf2ab5811a78ab652185da3028ecb4f4b55f9e120 BNB0.00244038
0xf46c0917d93fde73aef1f68fba184af55907e61e5ea84a12e6f083e2a0b4dfafClaim Reward74158972021-05-14 23:28:33154 days 12 hrs ago0x750c9389f76147aa3532b55db20b28208e32d106 IN  0xbf2ab5811a78ab652185da3028ecb4f4b55f9e120 BNB0.00081346
0x712946fdca45ba482b3453555c9111c046015b34091bc5688ffa7f58d388c727Participate74134252021-05-14 21:24:20154 days 14 hrs ago0xca5faae6a0d2db10a46432a384f7066d86db6d46 IN  0xbf2ab5811a78ab652185da3028ecb4f4b55f9e120 BNB0.0009175
0x37726207c83db5bf6a397daaea5cfb4ba1eb814f952458c5f0a0b288034d78ba0x6080604073728482021-05-13 11:08:18156 days 1 hr agoDumpling Swap: Deployer IN  Contract Creation0 BNB0.03007988
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Contract Source Code Verified (Exact Match)

Contract Name:
BiddingGameMini

Compiler Version
v0.6.12+commit.27d51765

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion

Contract Source Code (Solidity Standard Json-Input format)

File 1 of 7 : BiddingGameMini.sol
//SPDX-License-Identifier: Unlicense
pragma solidity 0.6.12;

import "./libs/IBEP20.sol";
import "./libs/SafeBEP20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

contract BiddingGameMini is Ownable {
	using SafeBEP20 for IBEP20;

	IBEP20 public token;

	uint256 public lastBidTime;
	address public lastBidder;
	address public secondPlace;
	address public thirdPlace;

	uint256 public minimumBidDivider;

	address public burnAddress = 0x000000000000000000000000000000000000dEaD;

	event OnBid(address indexed author, uint256 amount);
	event OnWin(address indexed author, uint256 amount);
	event OnBurn(uint256 amount);

	uint32 public collapseDelay = 7200; //2 hour

	modifier onlyHuman() {
		require(msg.sender == tx.origin);
		_;
	}

	constructor(address _token) public {
		token = IBEP20(_token);
	}

	function participate(uint256 amount, uint32 slippage) public onlyHuman {
		require(!hasWinner(), "winner, claim first");

		uint256 currentBalance = token.balanceOf(address(this));
		require(amount >= currentBalance / 20, "min 5% bid");

		uint256 burnAmount = amount / 10; //10%
		token.safeTransferFrom(msg.sender, burnAddress, burnAmount);
		token.safeTransferFrom(msg.sender, address(this), amount - burnAmount);

		emit OnBid(msg.sender, amount);
		emit OnBurn(burnAmount);

		if (lastBidTime == 0) {
			lastBidTime = block.timestamp;
		}
		secondPlace = lastBidder;
		thirdPlace = secondPlace;
		lastBidder = msg.sender;
	}

	function hasWinner() public view returns (bool) {
		return lastBidTime != 0 && block.timestamp - lastBidTime >= collapseDelay;
	}

	function claimReward() public {
		require(hasWinner(), "no winner yet");

		uint256 totalBalance = token.balanceOf(address(this));
		uint256 winAmount = totalBalance / 2; //50%
		uint256 firstPlaceAmount = (winAmount / 10) * 6; // 50% of the win amount - first winner
		uint256 secondPlaceAmount = (winAmount / 10) * 3; //30% of the win amount - second winner
		uint256 thirdPlaceAmount = winAmount - firstPlaceAmount - secondPlaceAmount; //30% of the win amount - second winner

		uint256 nextRoundAmount = totalBalance / 10; //10%
		uint256 burnAmount = totalBalance - winAmount - nextRoundAmount; //40%

		token.safeTransfer(lastBidder, firstPlaceAmount);
		token.safeTransfer(secondPlace, secondPlaceAmount);
		token.safeTransfer(thirdPlace, thirdPlaceAmount);

		token.safeTransfer(burnAddress, burnAmount);
		lastBidTime = 0;
		emit OnWin(lastBidder, winAmount);
		emit OnBurn(burnAmount);
	}

	function setCollapseDelay(uint32 delay) public onlyOwner {
		require(delay >= 60, "must be at least a minute");
		collapseDelay = delay;
	}

	function setMinBid(uint32 minBid) public onlyOwner {
		require(minBid >= 100, "must be at less than 100");
		minimumBidDivider = minBid;
	}
}

File 2 of 7 : IBEP20.sol
pragma solidity >=0.6.4;

interface IBEP20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

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

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

    /**
     * @dev Returns the bep token owner.
     */
    function getOwner() external view returns (address);

    /**
     * @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 3 of 7 : SafeBEP20.sol
// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "./IBEP20.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/utils/Address.sol";

/**
 * @title SafeBEP20
 * @dev Wrappers around BEP20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeBEP20 for IBEP20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeBEP20 {
    using SafeMath for uint256;
    using Address for address;

    function safeTransfer(IBEP20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(IBEP20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IBEP20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IBEP20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        // solhint-disable-next-line max-line-length
        require((value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeBEP20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(IBEP20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).add(value);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(IBEP20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeBEP20: decreased allowance below zero");
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IBEP20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeBEP20: low-level call failed");
        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeBEP20: BEP20 operation did not succeed");
        }
    }
}

File 4 of 7 : Ownable.sol
// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "../utils/Context.sol";
/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () internal {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

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

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

File 5 of 7 : SafeMath.sol
// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @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, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, 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 (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }

    /**
     * @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) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }

    /**
     * @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) {
        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, reverting 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) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting 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) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * 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);
        return a - b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * 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);
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * 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 6 of 7 : Address.sol
// SPDX-License-Identifier: MIT

pragma solidity >=0.6.2 <0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: value }(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

File 7 of 7 : Context.sol
// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN 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 payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

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

Contract Security Audit

Contract ABI

[{"inputs":[{"internalType":"address","name":"_token","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"author","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"OnBid","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"OnBurn","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"author","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"OnWin","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"inputs":[],"name":"burnAddress","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"claimReward","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"collapseDelay","outputs":[{"internalType":"uint32","name":"","type":"uint32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"hasWinner","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"lastBidTime","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"lastBidder","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"minimumBidDivider","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint32","name":"slippage","type":"uint32"}],"name":"participate","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"secondPlace","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint32","name":"delay","type":"uint32"}],"name":"setCollapseDelay","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint32","name":"minBid","type":"uint32"}],"name":"setMinBid","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"thirdPlace","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"token","outputs":[{"internalType":"contract IBEP20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

00000000000000000000000013f6751ba11337bc67abbdad638a56194ee133b8

-----Decoded View---------------
Arg [0] : _token (address): 0x13f6751ba11337bc67abbdad638a56194ee133b8

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 00000000000000000000000013f6751ba11337bc67abbdad638a56194ee133b8


Block Transaction Gas Used Reward
Age Block Fee Address BC Fee Address Voting Power Jailed Incoming
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