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Outline

• library SafeMath
•    - function mul(uint256 a, uint256 b)
•    - function div(uint256 a, uint256 b)
•    - function sub(uint256 a, uint256 b)
•    - function add(uint256 a, uint256 b)
•  contract PonziTokenMinInterface
•    - function balanceOf(address owner)
•    - function transfer(address to, uint256 ...
•  contract PonziSeller *
•    - function PonziSeller()
•    - function()
•    - function setPonziAddress(address ponz ...
•    - function ponziAddress()
•    - function ponziPriceInWei()
•    - function setPonziPriceInWei(uint256 n ...
•    - function rewardPercent()
•    - function discountPercent()
•    - function provideAccess(address adminA ...
•    - function setRewardPercent(uint256 new ...
•    - function setDiscountPercent(uint256 n ...
•    - function byPonzi(address refAddr)
•    - function availablePonzi()
•    - function withdrawETH()
•    - function withdrawPonzi(uint256 amount ...
•    - function weiToPonzi(uint256 weiAmount ...

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/**
 *Submitted for verification at Etherscan.io on 2018-05-29
*/

pragma solidity ^0.4.18;

/**
* Ponzi Trust Token Seller Smart Contract
* Code is published on https://github.com/PonziTrust/TokenSeller
* Ponzi Trust https://ponzitrust.com/
*/

// see: https://github.com/OpenZeppelin/zeppelin-solidity/blob/master/contracts/math/SafeMath.sol
library SafeMath {
  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;
  }

  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;
  }

  function sub(uint256 a, uint256 b) internal pure returns (uint256) {
    assert(b <= a);
    return a - b;
  }

  function add(uint256 a, uint256 b) internal pure returns (uint256) {
    uint256 c = a + b;
    assert(c >= a);
    return c;
  }
}


// Ponzi Token Minimal Interface
contract PonziTokenMinInterface {
  function balanceOf(address owner) public view returns(uint256);
  function transfer(address to, uint256 value) public returns (bool);
}


contract PonziSeller {
  using SafeMath for uint256;
  enum AccessRank {
    None,
    SetPrice,
    Withdraw,
    Full
  }

  address private constant PONZI_ADDRESS = 0xc2807533832807Bf15898778D8A108405e9edfb1;
  PonziTokenMinInterface private m_ponzi;
  uint256 private m_ponziPriceInWei;
  uint256 private m_rewardNum;
  uint256 private m_rewardDen;
  uint256 private m_discountNum;
  uint256 private m_discountDen;
  mapping(address => AccessRank) private m_admins;

  event PriceChanged(address indexed who, uint256 newPrice);
  event RewardRef(address indexed refAddr, uint256 wieAmount);
  event WithdrawalETH(address indexed to, uint256 amountInWei);
  event WithdrawalPonzi(address indexed to, uint256 amount);
  event ProvidingAccess(address indexed addr, AccessRank rank);
  event PonziSold(
    address indexed purchasedBy, 
    uint256 indexed priceInWei, 
    uint256 ponziAmount, 
    uint256 weiAmount, 
    address indexed refAddr 
  );
  event NotEnoughPonzi(
    address indexed addr, 
    uint256 weiAmount, 
    uint256 ponziPriceInWei, 
    uint256 ponziBalance
  );

  modifier onlyAdmin(AccessRank  r) {
    require(m_admins[msg.sender] == r || m_admins[msg.sender] == AccessRank.Full);
    _;
  }

  function PonziSeller() public {
    m_ponzi = PonziTokenMinInterface(PONZI_ADDRESS);
    m_admins[msg.sender] = AccessRank.Full;
    m_rewardNum = 1;
    m_rewardDen = 10;
    m_discountNum = 5;
    m_discountDen = 100;
    m_ponziPriceInWei = 50000000;
  }

  function() public payable {
    byPonzi(address(0));
  }

  function setPonziAddress(address ponziAddr) public onlyAdmin(AccessRank.Full) {
    m_ponzi = PonziTokenMinInterface(ponziAddr);
  }

  function ponziAddress() public view returns (address ponziAddr) {
    return address(m_ponzi);
  }

  function ponziPriceInWei() public view returns (uint256) { 
    return m_ponziPriceInWei;
  }

  function setPonziPriceInWei(uint256 newPonziPriceInWei) public onlyAdmin(AccessRank.SetPrice) { 
    m_ponziPriceInWei = newPonziPriceInWei;
    emit PriceChanged(msg.sender, m_ponziPriceInWei);
  }

  function rewardPercent() public view returns (uint256 numerator, uint256 denominator) {
    numerator = m_rewardNum;
    denominator = m_rewardDen;
  }

  function discountPercent() public view returns (uint256 numerator, uint256 denominator) {
    numerator = m_discountNum;
    denominator = m_discountDen;
  }

  function provideAccess(address adminAddr, uint8 rank) public onlyAdmin(AccessRank.Full) {
    require(rank <= uint8(AccessRank.Full));
    require(m_admins[adminAddr] != AccessRank.Full);
    m_admins[adminAddr] = AccessRank(rank);
  }

  function setRewardPercent(uint256 newNumerator, uint256 newDenominator) public onlyAdmin(AccessRank.Full) {
    require(newDenominator != 0);
    m_rewardNum = newNumerator;
    m_rewardDen = newDenominator;
  }

  function setDiscountPercent(uint256 newNumerator, uint256 newDenominator) public onlyAdmin(AccessRank.Full) {
    require(newDenominator != 0);
    m_discountNum = newNumerator;
    m_discountDen = newDenominator;
  }

  function byPonzi(address refAddr) public payable {
    require(m_ponziPriceInWei > 0 && msg.value > m_ponziPriceInWei);

    uint256 refWeiAmount = 0;
    uint256 senderPonziAmount = weiToPonzi(msg.value, m_ponziPriceInWei);

    // check if ref addres is valid and calc reward and discount
    if (refAddr != msg.sender && refAddr != address(0) && refAddr != address(this)) {
      // ref reward
      refWeiAmount = msg.value.mul(m_rewardNum).div(m_rewardDen);
      // sender discount
      senderPonziAmount = senderPonziAmount.mul(m_discountDen).div(m_discountDen-m_discountNum);
    }
    // check if we have enough ponzi on balance
    if (availablePonzi() < senderPonziAmount) {
      emit NotEnoughPonzi(msg.sender, msg.value, m_ponziPriceInWei, availablePonzi());
      revert();
    }
    // transfer ponzi to sender
    require(m_ponzi.transfer(msg.sender, senderPonziAmount));
    // transfer eth to ref if needed
    if (refWeiAmount > 0) {
      refAddr.transfer(refWeiAmount);
      emit RewardRef(refAddr, refWeiAmount);
    }
    emit PonziSold(msg.sender, m_ponziPriceInWei, senderPonziAmount, msg.value, refAddr);
  }

  function availablePonzi() public view returns (uint256) {
    return m_ponzi.balanceOf(address(this));
  }

  function withdrawETH() public onlyAdmin(AccessRank.Withdraw) {
    uint256 amountWei = address(this).balance;
    require(amountWei > 0);
    msg.sender.transfer(amountWei);
    assert(address(this).balance < amountWei);
    emit WithdrawalETH(msg.sender, amountWei);
  }

  function withdrawPonzi(uint256 amount) public onlyAdmin(AccessRank.Withdraw) {
    uint256 pt = availablePonzi();
    require(pt > 0 && amount > 0 && pt >= amount);
    require(m_ponzi.transfer(msg.sender, amount));
    assert(availablePonzi() < pt);
    emit WithdrawalPonzi(msg.sender, pt);
  }

  function weiToPonzi(uint256 weiAmount, uint256 tokenPrice) 
    internal 
    pure 
    returns(uint256 tokensAmount) 
  {
    tokensAmount = weiAmount.div(tokenPrice);
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

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