ETH Price: $3,568.27 (+1.96%)
Gas: 29 Gwei

Contract

0xda548e0AD6c88652FD21c38F46eDb58bE3a7B1dA
 

Overview

ETH Balance

0.032519768117546015 ETH

Eth Value

$116.04 (@ $3,568.27/ETH)

Multichain Info

No addresses found
Transaction Hash
Method
Block
From
To
Value
Sell74879132019-04-02 8:37:231822 days ago1554194243IN
0xda548e0A...bE3a7B1dA
0 ETH0.000093854
Sell74879112019-04-02 8:37:141822 days ago1554194234IN
0xda548e0A...bE3a7B1dA
0 ETH0.000230944
Withdraw74839932019-04-01 17:42:171823 days ago1554140537IN
0xda548e0A...bE3a7B1dA
0 ETH0.00023584
Buy73360232019-03-09 16:19:191846 days ago1552148359IN
0xda548e0A...bE3a7B1dA
0.00002676 ETH0.000412665
Buy73359892019-03-09 16:12:321846 days ago1552147952IN
0xda548e0A...bE3a7B1dA
0.019 ETH0.000412665
Buy73359702019-03-09 16:07:161846 days ago1552147636IN
0xda548e0A...bE3a7B1dA
0.000001 ETH0.000412055
Buy73359622019-03-09 16:05:381846 days ago1552147538IN
0xda548e0A...bE3a7B1dA
0.00879 ETH0.000412665
Buy73297102019-03-08 16:33:541847 days ago1552062834IN
0xda548e0A...bE3a7B1dA
0.00181559 ETH0.000247233
Withdraw73296942019-03-08 16:29:361847 days ago1552062576IN
0xda548e0A...bE3a7B1dA
0 ETH0.000176483
Buy73099192019-03-05 14:54:021850 days ago1551797642IN
0xda548e0A...bE3a7B1dA
0.0005 ETH0.000336873
Withdraw72407762019-02-19 14:58:491864 days ago1550588329IN
0xda548e0A...bE3a7B1dA
0 ETH0.0005907110
Withdraw72335052019-02-17 21:46:591866 days ago1550440019IN
0xda548e0A...bE3a7B1dA
0 ETH0.00047168
Withdraw72291722019-02-16 20:57:421867 days ago1550350662IN
0xda548e0A...bE3a7B1dA
0 ETH0.000293545
Withdraw72291152019-02-16 20:38:091867 days ago1550349489IN
0xda548e0A...bE3a7B1dA
0 ETH0.000406756.90000025
Sell72291112019-02-16 20:37:041867 days ago1550349424IN
0xda548e0A...bE3a7B1dA
0 ETH0.000398816.90000025
Sell72290872019-02-16 20:26:461867 days ago1550348806IN
0xda548e0A...bE3a7B1dA
0 ETH0.000175867.4749998
Sell72290792019-02-16 20:23:341867 days ago1550348614IN
0xda548e0A...bE3a7B1dA
0 ETH0.000189398.04999987
Withdraw72290182019-02-16 20:02:341867 days ago1550347354IN
0xda548e0A...bE3a7B1dA
0 ETH0.000524148.85500006
Pay Fund72286632019-02-16 18:04:151867 days ago1550340255IN
0xda548e0A...bE3a7B1dA
0 ETH0.000177755
Withdraw72273642019-02-16 10:51:301867 days ago1550314290IN
0xda548e0A...bE3a7B1dA
0 ETH0.000295965
Exit72273412019-02-16 10:43:131867 days ago1550313793IN
0xda548e0A...bE3a7B1dA
0 ETH0.0027842835
Withdraw72266282019-02-16 6:20:171867 days ago1550298017IN
0xda548e0A...bE3a7B1dA
0 ETH0.000295355
Sell72266202019-02-16 6:17:501867 days ago1550297870IN
0xda548e0A...bE3a7B1dA
0 ETH0.000404147
Sell72264472019-02-16 5:17:031867 days ago1550294223IN
0xda548e0A...bE3a7B1dA
0 ETH0.000117635
Sell72264462019-02-16 5:16:451867 days ago1550294205IN
0xda548e0A...bE3a7B1dA
0 ETH0.000288995
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Latest 25 internal transactions (View All)

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Parent Txn Hash Block From To Value
74839932019-04-01 17:42:171823 days ago1554140537
0xda548e0A...bE3a7B1dA
0.00113616 ETH
73296942019-03-08 16:29:361847 days ago1552062576
0xda548e0A...bE3a7B1dA
0.00141476 ETH
72407762019-02-19 14:58:491864 days ago1550588329
0xda548e0A...bE3a7B1dA
0.12301165 ETH
72335052019-02-17 21:46:591866 days ago1550440019
0xda548e0A...bE3a7B1dA
0.04272689 ETH
72291722019-02-16 20:57:421867 days ago1550350662
0xda548e0A...bE3a7B1dA
0.00000029 ETH
72291152019-02-16 20:38:091867 days ago1550349489
0xda548e0A...bE3a7B1dA
0.01718788 ETH
72290182019-02-16 20:02:341867 days ago1550347354
0xda548e0A...bE3a7B1dA
0.21069363 ETH
72286632019-02-16 18:04:151867 days ago1550340255
0xda548e0A...bE3a7B1dA
0.32468273 ETH
72273642019-02-16 10:51:301867 days ago1550314290
0xda548e0A...bE3a7B1dA
0.25539827 ETH
72273412019-02-16 10:43:131867 days ago1550313793
0xda548e0A...bE3a7B1dA
0.32020729 ETH
72266282019-02-16 6:20:171867 days ago1550298017
0xda548e0A...bE3a7B1dA
0.06194224 ETH
72264452019-02-16 5:16:301867 days ago1550294190
0xda548e0A...bE3a7B1dA
0.4991504 ETH
72262362019-02-16 4:13:381867 days ago1550290418
0xda548e0A...bE3a7B1dA
1.12150455 ETH
72260352019-02-16 3:02:161867 days ago1550286136
0xda548e0A...bE3a7B1dA
4.43227594 ETH
72242162019-02-15 16:29:531868 days ago1550248193
0xda548e0A...bE3a7B1dA
0.018108 ETH
72212172019-02-14 23:17:481869 days ago1550186268
0xda548e0A...bE3a7B1dA
1.63555809 ETH
72167932019-02-13 21:43:261870 days ago1550094206
0xda548e0A...bE3a7B1dA
0.11430402 ETH
72085412019-02-11 22:52:381872 days ago1549925558
0xda548e0A...bE3a7B1dA
0.4991679 ETH
72084802019-02-11 22:31:021872 days ago1549924262
0xda548e0A...bE3a7B1dA
0.79362129 ETH
72079962019-02-11 19:35:181872 days ago1549913718
0xda548e0A...bE3a7B1dA
0.33582159 ETH
72079582019-02-11 19:25:191872 days ago1549913119
0xda548e0A...bE3a7B1dA
0.63730743 ETH
72079562019-02-11 19:24:451872 days ago1549913085
0xda548e0A...bE3a7B1dA
8.39485711 ETH
72079512019-02-11 19:22:201872 days ago1549912940
0xda548e0A...bE3a7B1dA
0.01101348 ETH
72079512019-02-11 19:22:201872 days ago1549912940
0xda548e0A...bE3a7B1dA
0.01957207 ETH
72079512019-02-11 19:22:201872 days ago1549912940
0xda548e0A...bE3a7B1dA
0.01957207 ETH
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Contract Source Code Verified (Exact Match)

Contract Name:
Exchange

Compiler Version
v0.4.25+commit.59dbf8f1

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion

Contract Source Code (Solidity)

/**
 *Submitted for verification at Etherscan.io on 2019-01-17
*/

pragma solidity ^0.4.25;

contract AcceptsExchange {
    Exchange public tokenContract;

    constructor(address _tokenContract) public {
        tokenContract = Exchange(_tokenContract);
    }

    modifier onlyTokenContract {
        require(msg.sender == address(tokenContract));
        _;
    }

    /**
    * @dev Standard ERC677 function that will handle incoming token transfers.
    *
    * @param _from  Token sender address.
    * @param _value Amount of tokens.
    * @param _data  Transaction metadata.
    */
    function tokenFallback(address _from, uint256 _value, bytes _data) external returns (bool);
}


contract Exchange {
    /*=================================
    =            MODIFIERS            =
    =================================*/
    // only people with tokens
    modifier onlyBagholders() {
        require(myTokens() > 0);
        _;
    }

    // only people with profits
    modifier onlyStronghands() {
        require(myDividends(true) > 0);
        _;
    }

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

    // administrators can:
    // -> change the name of the contract
    // -> change the name of the token
    // -> change the PoS difficulty (How many tokens it costs to hold a masternode, in case it gets crazy high later)
    // they CANNOT:
    // -> take funds
    // -> disable withdrawals
    // -> kill the contract
    // -> change the price of tokens
    modifier onlyAdministrator(){
        address _customerAddress = msg.sender;
        require(administrators[_customerAddress]);
        _;
    }

    uint ACTIVATION_TIME = 1547996400;

    // ensures that the first tokens in the contract will be equally distributed
    // meaning, no divine dump will be ever possible
    // result: healthy longevity.
    modifier antiEarlyWhale(uint256 _amountOfEthereum){
        address _customerAddress = msg.sender;

        if (now >= ACTIVATION_TIME) {
            onlyAmbassadors = false;
        }

        // are we still in the vulnerable phase?
        // if so, enact anti early whale protocol
        if( onlyAmbassadors && ((totalEthereumBalance() - _amountOfEthereum) <= ambassadorQuota_ )){
            require(
                // is the customer in the ambassador list?
                ambassadors_[_customerAddress] == true &&

                // does the customer purchase exceed the max ambassador quota?
                (ambassadorAccumulatedQuota_[_customerAddress] + _amountOfEthereum) <= ambassadorMaxPurchase_

            );

            // updated the accumulated quota
            ambassadorAccumulatedQuota_[_customerAddress] = SafeMath.add(ambassadorAccumulatedQuota_[_customerAddress], _amountOfEthereum);

            // execute
            _;
        } else {
            if((totalEthereumBalance() - _amountOfEthereum) < 250 ether)
              require(tx.gasprice <= 0.05 szabo);

            // in case the ether count drops low, the ambassador phase won't reinitiate
            onlyAmbassadors = false;
            _;
        }

    }

    /*==============================
    =            EVENTS            =
    ==============================*/
    event onTokenPurchase(
        address indexed customerAddress,
        uint256 incomingEthereum,
        uint256 tokensMinted,
        address indexed referredBy,
        bool isReinvest,
        uint timestamp,
        uint256 price
    );

    event onTokenSell(
        address indexed customerAddress,
        uint256 tokensBurned,
        uint256 ethereumEarned,
        uint timestamp,
        uint256 price
    );

    event onReinvestment(
        address indexed customerAddress,
        uint256 ethereumReinvested,
        uint256 tokensMinted
    );

    event onWithdraw(
        address indexed customerAddress,
        uint256 ethereumWithdrawn,
        uint256 estimateTokens,
        bool isTransfer
    );

    // ERC20
    event Transfer(
        address indexed from,
        address indexed to,
        uint256 tokens
    );


    /*=====================================
    =            CONFIGURABLES            =
    =====================================*/
    string public name = "EXCHANGE";
    string public symbol = "DICE";
    uint8 constant public decimals = 18;

    uint8 constant internal dividendFee_ = 20; // 20% dividend fee on each buy and sell
    uint8 constant internal fundFee_ = 5; // 5% to dice game

    uint256 constant internal tokenPriceInitial_ = 0.00000001 ether;
    uint256 constant internal tokenPriceIncremental_ = 0.000000001 ether;
    uint256 constant internal magnitude = 2**64;

    // Address to send the 5% Fee
    address public giveEthFundAddress = 0x0;
    bool public finalizedEthFundAddress = false;
    uint256 public totalEthFundReceived; // total ETH charity received from this contract
    uint256 public totalEthFundCollected; // total ETH charity collected in this contract

    // proof of stake (defaults at 250 tokens)
    uint256 public stakingRequirement = 250e18;

    // ambassador program
    mapping(address => bool) internal ambassadors_;
    uint256 constant internal ambassadorMaxPurchase_ = 4 ether;
    uint256 constant internal ambassadorQuota_ = 4 ether;

   /*================================
    =            DATASETS            =
    ================================*/
    // amount of shares for each address (scaled number)
    mapping(address => uint256) internal tokenBalanceLedger_;
    mapping(address => uint256) internal referralBalance_;
    mapping(address => int256) internal payoutsTo_;
    mapping(address => uint256) internal ambassadorAccumulatedQuota_;
    uint256 internal tokenSupply_ = 0;
    uint256 internal profitPerShare_;

    // administrator list (see above on what they can do)
    mapping(address => bool) public administrators;

    // when this is set to true, only ambassadors can purchase tokens (this prevents a whale premine, it ensures a fairly distributed upper pyramid)
    bool public onlyAmbassadors = true;

    // To whitelist game contracts on the platform
    mapping(address => bool) public canAcceptTokens_; // contracts, which can accept the exchanges tokens

    /*=======================================
    =            PUBLIC FUNCTIONS            =
    =======================================*/
    /*
    * -- APPLICATION ENTRY POINTS --
    */
    constructor()
        public
    {
        // add administrators here
        administrators[0xB477ACeb6262b12a3c7b2445027a072f95C75Bd3] = true;

        // add the ambassadors here
        ambassadors_[0xB477ACeb6262b12a3c7b2445027a072f95C75Bd3] = true;
    }


    /**
     * Converts all incoming ethereum to tokens for the caller, and passes down the referral addy (if any)
     */
    function buy(address _referredBy)
        public
        payable
        returns(uint256)
    {
        purchaseTokens(msg.value, _referredBy, false);
    }

    /**
     * Fallback function to handle ethereum that was send straight to the contract
     * Unfortunately we cannot use a referral address this way.
     */
    function()
        payable
        public
    {
        purchaseTokens(msg.value, 0x0, false);
    }

    function updateFundAddress(address _newAddress)
        onlyAdministrator()
        public
    {
        require(finalizedEthFundAddress == false);
        giveEthFundAddress = _newAddress;
    }

    function finalizeFundAddress(address _finalAddress)
        onlyAdministrator()
        public
    {
        require(finalizedEthFundAddress == false);
        giveEthFundAddress = _finalAddress;
        finalizedEthFundAddress = true;
    }

    /**
     * Sends fund to dice smart contract
     * No Reentrancy attack as address is finalized to dice smart contract
     */
    function payFund() public {
        uint256 ethToPay = SafeMath.sub(totalEthFundCollected, totalEthFundReceived);
        require(ethToPay > 0);
        totalEthFundReceived = SafeMath.add(totalEthFundReceived, ethToPay);
        giveEthFundAddress.transfer(ethToPay);
    }

    /**
     * Converts all of caller's dividends to tokens.
     */
    function reinvest()
        onlyStronghands()
        public
    {
        // fetch dividends
        uint256 _dividends = myDividends(false); // retrieve ref. bonus later in the code

        // pay out the dividends virtually
        address _customerAddress = msg.sender;
        payoutsTo_[_customerAddress] +=  (int256) (_dividends * magnitude);

        // retrieve ref. bonus
        _dividends += referralBalance_[_customerAddress];
        referralBalance_[_customerAddress] = 0;

        // dispatch a buy order with the virtualized "withdrawn dividends"
        uint256 _tokens = purchaseTokens(_dividends, 0x0, true);

        // fire event
        emit onReinvestment(_customerAddress, _dividends, _tokens);
    }

    /**
     * Alias of sell() and withdraw().
     */
    function exit()
        public
    {
        // get token count for caller & sell them all
        address _customerAddress = msg.sender;
        uint256 _tokens = tokenBalanceLedger_[_customerAddress];
        if(_tokens > 0) sell(_tokens);

        // lambo delivery service
        withdraw(false);
    }

    /**
     * Withdraws all of the callers earnings.
     */
    function withdraw(bool _isTransfer)
        onlyStronghands()
        public
    {
        // setup data
        address _customerAddress = msg.sender;
        uint256 _dividends = myDividends(false); // get ref. bonus later in the code

        uint256 _estimateTokens = calculateTokensReceived(_dividends);

        // update dividend tracker
        payoutsTo_[_customerAddress] += (int256) (_dividends * magnitude);

        // add ref. bonus
        _dividends += referralBalance_[_customerAddress];
        referralBalance_[_customerAddress] = 0;

        // lambo delivery service
        _customerAddress.transfer(_dividends);

        // fire event
        emit onWithdraw(_customerAddress, _dividends, _estimateTokens, _isTransfer);
    }

    /**
     * Liquifies tokens to ethereum.
     */
    function sell(uint256 _amountOfTokens)
        onlyBagholders()
        public
    {
        // setup data
        address _customerAddress = msg.sender;
        // russian hackers BTFO
        require(_amountOfTokens <= tokenBalanceLedger_[_customerAddress]);
        uint256 _tokens = _amountOfTokens;
        uint256 _ethereum = tokensToEthereum_(_tokens);

        uint256 _dividends = SafeMath.div(SafeMath.mul(_ethereum, dividendFee_), 100);
        uint256 _fundPayout = SafeMath.div(SafeMath.mul(_ethereum, fundFee_), 100);

        // Take out dividends and then _fundPayout
        uint256 _taxedEthereum =  SafeMath.sub(SafeMath.sub(_ethereum, _dividends), _fundPayout);

        // Add ethereum to send to fund
        totalEthFundCollected = SafeMath.add(totalEthFundCollected, _fundPayout);

        // burn the sold tokens
        tokenSupply_ = SafeMath.sub(tokenSupply_, _tokens);
        tokenBalanceLedger_[_customerAddress] = SafeMath.sub(tokenBalanceLedger_[_customerAddress], _tokens);

        // update dividends tracker
        int256 _updatedPayouts = (int256) (profitPerShare_ * _tokens + (_taxedEthereum * magnitude));
        payoutsTo_[_customerAddress] -= _updatedPayouts;

        // dividing by zero is a bad idea
        if (tokenSupply_ > 0) {
            // update the amount of dividends per token
            profitPerShare_ = SafeMath.add(profitPerShare_, (_dividends * magnitude) / tokenSupply_);
        }

        // fire event
        emit Transfer(_customerAddress, address(0), _tokens);

        // fire event
        emit onTokenSell(_customerAddress, _tokens, _taxedEthereum, now, buyPrice());
    }


    /**
     * Transfer tokens from the caller to a new holder.
     * REMEMBER THIS IS 0% TRANSFER FEE
     */
    function transfer(address _toAddress, uint256 _amountOfTokens)
        onlyBagholders()
        public
        returns(bool)
    {
        // setup
        address _customerAddress = msg.sender;

        // make sure we have the requested tokens
        // also disables transfers until ambassador phase is over
        // ( we dont want whale premines )
        require(_amountOfTokens <= tokenBalanceLedger_[_customerAddress]);

        // withdraw all outstanding dividends first
        if(myDividends(true) > 0) withdraw(true);

        // exchange tokens
        tokenBalanceLedger_[_customerAddress] = SafeMath.sub(tokenBalanceLedger_[_customerAddress], _amountOfTokens);
        tokenBalanceLedger_[_toAddress] = SafeMath.add(tokenBalanceLedger_[_toAddress], _amountOfTokens);

        // update dividend trackers
        payoutsTo_[_customerAddress] -= (int256) (profitPerShare_ * _amountOfTokens);
        payoutsTo_[_toAddress] += (int256) (profitPerShare_ * _amountOfTokens);


        // fire event
        emit Transfer(_customerAddress, _toAddress, _amountOfTokens);

        // ERC20
        return true;
    }

    /**
    * Transfer token to a specified address and forward the data to recipient
    * ERC-677 standard
    * https://github.com/ethereum/EIPs/issues/677
    * @param _to    Receiver address.
    * @param _value Amount of tokens that will be transferred.
    * @param _data  Transaction metadata.
    */
    function transferAndCall(address _to, uint256 _value, bytes _data) external returns (bool) {
      require(_to != address(0));
      require(canAcceptTokens_[_to] == true); // security check that contract approved by the exchange
      require(transfer(_to, _value)); // do a normal token transfer to the contract

      if (isContract(_to)) {
        AcceptsExchange receiver = AcceptsExchange(_to);
        require(receiver.tokenFallback(msg.sender, _value, _data));
      }

      return true;
    }

    /**
     * Additional check that the game address we are sending tokens to is a contract
     * assemble the given address bytecode. If bytecode exists then the _addr is a contract.
     */
     function isContract(address _addr) private constant returns (bool is_contract) {
       // retrieve the size of the code on target address, this needs assembly
       uint length;
       assembly { length := extcodesize(_addr) }
       return length > 0;
     }

    /*----------  ADMINISTRATOR ONLY FUNCTIONS  ----------*/
    /**

    /**
     * In case one of us dies, we need to replace ourselves.
     */
    function setAdministrator(address _identifier, bool _status)
        onlyAdministrator()
        public
    {
        administrators[_identifier] = _status;
    }

    /**
     * Precautionary measures in case we need to adjust the masternode rate.
     */
    function setStakingRequirement(uint256 _amountOfTokens)
        onlyAdministrator()
        public
    {
        stakingRequirement = _amountOfTokens;
    }

    /**
     * Add or remove game contract, which can accept tokens
     */
    function setCanAcceptTokens(address _address, bool _value)
      onlyAdministrator()
      public
    {
      canAcceptTokens_[_address] = _value;
    }

    /**
     * If we want to rebrand, we can.
     */
    function setName(string _name)
        onlyAdministrator()
        public
    {
        name = _name;
    }

    /**
     * If we want to rebrand, we can.
     */
    function setSymbol(string _symbol)
        onlyAdministrator()
        public
    {
        symbol = _symbol;
    }


    /*----------  HELPERS AND CALCULATORS  ----------*/
    /**
     * Method to view the current Ethereum stored in the contract
     * Example: totalEthereumBalance()
     */
    function totalEthereumBalance()
        public
        view
        returns(uint)
    {
        return address(this).balance;
    }

    /**
     * Retrieve the total token supply.
     */
    function totalSupply()
        public
        view
        returns(uint256)
    {
        return tokenSupply_;
    }

    /**
     * Retrieve the tokens owned by the caller.
     */
    function myTokens()
        public
        view
        returns(uint256)
    {
        address _customerAddress = msg.sender;
        return balanceOf(_customerAddress);
    }

    /**
     * Retrieve the dividends owned by the caller.
     * If `_includeReferralBonus` is to to 1/true, the referral bonus will be included in the calculations.
     * The reason for this, is that in the frontend, we will want to get the total divs (global + ref)
     * But in the internal calculations, we want them separate.
     */
    function myDividends(bool _includeReferralBonus)
        public
        view
        returns(uint256)
    {
        address _customerAddress = msg.sender;
        return _includeReferralBonus ? dividendsOf(_customerAddress) + referralBalance_[_customerAddress] : dividendsOf(_customerAddress) ;
    }

    /**
     * Retrieve the token balance of any single address.
     */
    function balanceOf(address _customerAddress)
        view
        public
        returns(uint256)
    {
        return tokenBalanceLedger_[_customerAddress];
    }

    /**
     * Retrieve the dividend balance of any single address.
     */
    function dividendsOf(address _customerAddress)
        view
        public
        returns(uint256)
    {
        return (uint256) ((int256)(profitPerShare_ * tokenBalanceLedger_[_customerAddress]) - payoutsTo_[_customerAddress]) / magnitude;
    }

    /**
     * Return the buy price of 1 individual token.
     */
    function sellPrice()
        public
        view
        returns(uint256)
    {
        // our calculation relies on the token supply, so we need supply. Doh.
        if(tokenSupply_ == 0){
            return tokenPriceInitial_ - tokenPriceIncremental_;
        } else {
            uint256 _ethereum = tokensToEthereum_(1e18);
            uint256 _dividends = SafeMath.div(SafeMath.mul(_ethereum, dividendFee_), 100);
            uint256 _fundPayout = SafeMath.div(SafeMath.mul(_ethereum, fundFee_), 100);
            uint256 _taxedEthereum = SafeMath.sub(SafeMath.sub(_ethereum, _dividends), _fundPayout);
            return _taxedEthereum;
        }
    }

    /**
     * Return the sell price of 1 individual token.
     */
    function buyPrice()
        public
        view
        returns(uint256)
    {
        // our calculation relies on the token supply, so we need supply. Doh.
        if(tokenSupply_ == 0){
            return tokenPriceInitial_ + tokenPriceIncremental_;
        } else {
            uint256 _ethereum = tokensToEthereum_(1e18);
            uint256 _dividends = SafeMath.div(SafeMath.mul(_ethereum, dividendFee_), 100);
            uint256 _fundPayout = SafeMath.div(SafeMath.mul(_ethereum, fundFee_), 100);
            uint256 _taxedEthereum =  SafeMath.add(SafeMath.add(_ethereum, _dividends), _fundPayout);
            return _taxedEthereum;
        }
    }

    /**
     * Function for the frontend to dynamically retrieve the price scaling of buy orders.
     */
    function calculateTokensReceived(uint256 _ethereumToSpend)
        public
        view
        returns(uint256)
    {
        uint256 _dividends = SafeMath.div(SafeMath.mul(_ethereumToSpend, dividendFee_), 100);
        uint256 _fundPayout = SafeMath.div(SafeMath.mul(_ethereumToSpend, fundFee_), 100);
        uint256 _taxedEthereum = SafeMath.sub(SafeMath.sub(_ethereumToSpend, _dividends), _fundPayout);
        uint256 _amountOfTokens = ethereumToTokens_(_taxedEthereum);
        return _amountOfTokens;
    }

    /**
     * Function for the frontend to dynamically retrieve the price scaling of sell orders.
     */
    function calculateEthereumReceived(uint256 _tokensToSell)
        public
        view
        returns(uint256)
    {
        require(_tokensToSell <= tokenSupply_);
        uint256 _ethereum = tokensToEthereum_(_tokensToSell);
        uint256 _dividends = SafeMath.div(SafeMath.mul(_ethereum, dividendFee_), 100);
        uint256 _fundPayout = SafeMath.div(SafeMath.mul(_ethereum, fundFee_), 100);
        uint256 _taxedEthereum = SafeMath.sub(SafeMath.sub(_ethereum, _dividends), _fundPayout);
        return _taxedEthereum;
    }

    /**
     * Function for the frontend to show ether waiting to be send to fund in contract
     */
    function etherToSendFund()
        public
        view
        returns(uint256) {
        return SafeMath.sub(totalEthFundCollected, totalEthFundReceived);
    }

    /*==========================================
    =            INTERNAL FUNCTIONS            =
    ==========================================*/

    function purchaseTokens(uint256 _incomingEthereum, address _referredBy, bool _isReinvest)
        antiEarlyWhale(_incomingEthereum)
        internal
        returns(uint256)
    {
        // data setup
        uint256 _undividedDividends = SafeMath.div(SafeMath.mul(_incomingEthereum, dividendFee_), 100);
        uint256 _fundPayout = SafeMath.div(SafeMath.mul(_incomingEthereum, fundFee_), 100);
        uint256 _dividends = SafeMath.sub(_undividedDividends, SafeMath.div(_undividedDividends, 3));
        uint256 _taxedEthereum = SafeMath.sub(SafeMath.sub(_incomingEthereum, _undividedDividends), _fundPayout);
        totalEthFundCollected = SafeMath.add(totalEthFundCollected, _fundPayout);

        uint256 _amountOfTokens = ethereumToTokens_(_taxedEthereum);
        uint256 _fee = _dividends * magnitude;

        // no point in continuing execution if OP is a poor russian hacker
        // prevents overflow in the case that the pyramid somehow magically starts being used by everyone in the world
        // (or hackers)
        // and yes we know that the safemath function automatically rules out the "greater then" equation.
        require(_amountOfTokens > 0 && (SafeMath.add(_amountOfTokens,tokenSupply_) > tokenSupply_));

        // is the user referred by a masternode?
        if(
            // is this a referred purchase?
            _referredBy != 0x0000000000000000000000000000000000000000 &&

            // no cheating!
            _referredBy != msg.sender &&

            // does the referrer have at least X whole tokens?
            // i.e is the referrer a godly chad masternode
            tokenBalanceLedger_[_referredBy] >= stakingRequirement
        ){
            // wealth redistribution
            referralBalance_[_referredBy] = SafeMath.add(referralBalance_[_referredBy], SafeMath.div(_undividedDividends, 3));
        } else {
            // no ref purchase
            // add the referral bonus back to the global dividends cake
            _dividends = SafeMath.add(_dividends, SafeMath.div(_undividedDividends, 3));
            _fee = _dividends * magnitude;
        }

        // we can't give people infinite ethereum
        if(tokenSupply_ > 0){

            // add tokens to the pool
            tokenSupply_ = SafeMath.add(tokenSupply_, _amountOfTokens);

            // take the amount of dividends gained through this transaction, and allocates them evenly to each shareholder
            profitPerShare_ += (_dividends * magnitude / (tokenSupply_));

            // calculate the amount of tokens the customer receives over his purchase
            _fee = _fee - (_fee-(_amountOfTokens * (_dividends * magnitude / (tokenSupply_))));

        } else {
            // add tokens to the pool
            tokenSupply_ = _amountOfTokens;
        }

        // update circulating supply & the ledger address for the customer
        tokenBalanceLedger_[msg.sender] = SafeMath.add(tokenBalanceLedger_[msg.sender], _amountOfTokens);

        // Tells the contract that the buyer doesn't deserve dividends for the tokens before they owned them;
        //really i know you think you do but you don't
        int256 _updatedPayouts = (int256) ((profitPerShare_ * _amountOfTokens) - _fee);
        payoutsTo_[msg.sender] += _updatedPayouts;

        // fire event
        emit Transfer(address(0), msg.sender, _amountOfTokens);

        // fire event
        emit onTokenPurchase(msg.sender, _incomingEthereum, _amountOfTokens, _referredBy, _isReinvest, now, buyPrice());

        return _amountOfTokens;
    }

    /**
     * Calculate Token price based on an amount of incoming ethereum
     * It's an algorithm, hopefully we gave you the whitepaper with it in scientific notation;
     * Some conversions occurred to prevent decimal errors or underflows / overflows in solidity code.
     */
    function ethereumToTokens_(uint256 _ethereum)
        internal
        view
        returns(uint256)
    {
        uint256 _tokenPriceInitial = tokenPriceInitial_ * 1e18;
        uint256 _tokensReceived =
         (
            (
                // underflow attempts BTFO
                SafeMath.sub(
                    (sqrt
                        (
                            (_tokenPriceInitial**2)
                            +
                            (2*(tokenPriceIncremental_ * 1e18)*(_ethereum * 1e18))
                            +
                            (((tokenPriceIncremental_)**2)*(tokenSupply_**2))
                            +
                            (2*(tokenPriceIncremental_)*_tokenPriceInitial*tokenSupply_)
                        )
                    ), _tokenPriceInitial
                )
            )/(tokenPriceIncremental_)
        )-(tokenSupply_)
        ;

        return _tokensReceived;
    }

    /**
     * Calculate token sell value.
     * It's an algorithm, hopefully we gave you the whitepaper with it in scientific notation;
     * Some conversions occurred to prevent decimal errors or underflows / overflows in solidity code.
     */
     function tokensToEthereum_(uint256 _tokens)
        internal
        view
        returns(uint256)
    {

        uint256 tokens_ = (_tokens + 1e18);
        uint256 _tokenSupply = (tokenSupply_ + 1e18);
        uint256 _etherReceived =
        (
            // underflow attempts BTFO
            SafeMath.sub(
                (
                    (
                        (
                            tokenPriceInitial_ +(tokenPriceIncremental_ * (_tokenSupply/1e18))
                        )-tokenPriceIncremental_
                    )*(tokens_ - 1e18)
                ),(tokenPriceIncremental_*((tokens_**2-tokens_)/1e18))/2
            )
        /1e18);
        return _etherReceived;
    }


    //This is where all your gas goes, sorry
    //Not sorry, you probably only paid 1 gwei
    function sqrt(uint x) internal pure returns (uint y) {
        uint z = (x + 1) / 2;
        y = x;
        while (z < y) {
            y = z;
            z = (x / z + z) / 2;
        }
    }
}

/**
 * @title SafeMath
 * @dev Math operations with safety checks that throw on error
 */
library SafeMath {

    /**
    * @dev Multiplies two numbers, throws on overflow.
    */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }
        uint256 c = a * b;
        assert(c / a == b);
        return c;
    }

    /**
    * @dev Integer division of two numbers, truncating the quotient.
    */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        // assert(b > 0); // Solidity automatically throws when dividing by 0
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold
        return c;
    }

    /**
    * @dev Substracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend).
    */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        assert(b <= a);
        return a - b;
    }

    /**
    * @dev Adds two numbers, throws on overflow.
    */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        assert(c >= a);
        return c;
    }
}

Contract Security Audit

Contract ABI

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false,"inputs":[{"name":"_toAddress","type":"address"},{"name":"_amountOfTokens","type":"uint256"}],"name":"transfer","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_symbol","type":"string"}],"name":"setSymbol","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_name","type":"string"}],"name":"setName","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"totalEthFundReceived","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_amountOfTokens","type":"uint256"}],"name":"sell","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[],"name":"exit","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_referredBy","type":"address"}],"name":"buy","outputs":[{"name":"","type":"uint256"}],"payable":true,"stateMutability":"payable","type":"function"},{"constant":false,"inputs":[],"name":"reinvest","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"inputs":[],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"payable":true,"stateMutability":"payable","type":"fallback"},{"anonymous":false,"inputs":[{"indexed":true,"name":"customerAddress","type":"address"},{"indexed":false,"name":"incomingEthereum","type":"uint256"},{"indexed":false,"name":"tokensMinted","type":"uint256"},{"indexed":true,"name":"referredBy","type":"address"},{"indexed":false,"name":"isReinvest","type":"bool"},{"indexed":false,"name":"timestamp","type":"uint256"},{"indexed":false,"name":"price","type":"uint256"}],"name":"onTokenPurchase","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"customerAddress","type":"address"},{"indexed":false,"name":"tokensBurned","type":"uint256"},{"indexed":false,"name":"ethereumEarned","type":"uint256"},{"indexed":false,"name":"timestamp","type":"uint256"},{"indexed":false,"name":"price","type":"uint256"}],"name":"onTokenSell","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"customerAddress","type":"address"},{"indexed":false,"name":"ethereumReinvested","type":"uint256"},{"indexed":false,"name":"tokensMinted","type":"uint256"}],"name":"onReinvestment","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"customerAddress","type":"address"},{"indexed":false,"name":"ethereumWithdrawn","type":"uint256"},{"indexed":false,"name":"estimateTokens","type":"uint256"},{"indexed":false,"name":"isTransfer","type":"bool"}],"name":"onWithdraw","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"from","type":"address"},{"indexed":true,"name":"to","type":"address"},{"indexed":false,"name":"tokens","type":"uint256"}],"name":"Transfer","type":"event"}]

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Swarm Source

bzzr://9fc6a51137c4092d9151be6f2e5f75310c47f33fdd1845e60dfc8c1300ca69d4

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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.