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Contract

0x5ed17cA557359eAB39FEA1de8240BaC4b9C7BECa
 

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Transfer Ownersh...170260832023-04-11 16:40:35586 days ago1681231235IN
0x5ed17cA5...4b9C7BECa
0 ETH0.0014641551
Exit143467412022-03-08 14:36:27985 days ago1646750187IN
0x5ed17cA5...4b9C7BECa
0 ETH0.003121522.8993741
Exit131371842021-09-01 2:42:511174 days ago1630464171IN
0x5ed17cA5...4b9C7BECa
0 ETH0.01009793.2
Get Reward130616032021-08-20 10:28:201186 days ago1629455300IN
0x5ed17cA5...4b9C7BECa
0 ETH0.0016769117
Get Reward128936162021-07-25 5:36:071212 days ago1627191367IN
0x5ed17cA5...4b9C7BECa
0 ETH0.0013209816.2
Exit128718132021-07-21 20:03:441215 days ago1626897824IN
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0 ETH0.0024891324
Exit128670702021-07-21 2:07:451216 days ago1626833265IN
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0 ETH0.0021947316.5
Exit128597512021-07-19 22:38:551217 days ago1626734335IN
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0 ETH0.0014949217
Get Reward128597012021-07-19 22:28:321217 days ago1626733712IN
0x5ed17cA5...4b9C7BECa
0 ETH0.0020385525
Exit128248342021-07-14 11:17:101222 days ago1626261430IN
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0 ETH0.003361529
Exit128221582021-07-14 1:13:111223 days ago1626225191IN
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0 ETH0.0043332237.38309931
Exit128219292021-07-14 0:22:131223 days ago1626222133IN
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0 ETH0.0027819324
Exit128212852021-07-13 21:52:221223 days ago1626213142IN
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0 ETH0.0029019233
Get Reward128212812021-07-13 21:51:031223 days ago1626213063IN
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0 ETH0.0026908833
Exit128209002021-07-13 20:24:401223 days ago1626207880IN
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0 ETH0.0041573538
Get Reward128199432021-07-13 16:44:291223 days ago1626194669IN
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0 ETH0.0020923224
Get Reward128197012021-07-13 15:49:231223 days ago1626191363IN
0x5ed17cA5...4b9C7BECa
0 ETH0.0018307821
Exit128158852021-07-13 1:27:051224 days ago1626139625IN
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0 ETH0.0030494822
Exit128150392021-07-12 22:04:331224 days ago1626127473IN
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0 ETH0.0029163124
Get Reward128150212021-07-12 21:59:311224 days ago1626127171IN
0x5ed17cA5...4b9C7BECa
0 ETH0.0020923224
Exit128043552021-07-11 6:15:031226 days ago1625984103IN
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0 ETH0.000534654.4
Exit128008512021-07-10 16:56:521226 days ago1625936212IN
0x5ed17cA5...4b9C7BECa
0 ETH0.0012151310
Get Reward127977842021-07-10 5:22:091227 days ago1625894529IN
0x5ed17cA5...4b9C7BECa
0 ETH0.0011848211.36199999
Get Reward127932652021-07-09 12:56:421227 days ago1625835402IN
0x5ed17cA5...4b9C7BECa
0 ETH0.0024410428
Exit127892712021-07-08 21:52:111228 days ago1625781131IN
0x5ed17cA5...4b9C7BECa
0 ETH0.0017011814
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Similar Match Source Code
This contract matches the deployed Bytecode of the Source Code for Contract 0x269FA8c4...4745b45af
The constructor portion of the code might be different and could alter the actual behaviour of the contract

Contract Name:
PotPool

Compiler Version
v0.5.16+commit.9c3226ce

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion
File 1 of 14 : PotPool.sol
// SPDX-License-Identifier: MIT
pragma solidity 0.5.16;

import "./inheritance/Controllable.sol";
import "./interface/IController.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20Detailed.sol";
import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/math/Math.sol";
import "@openzeppelin/contracts/utils/Address.sol";
import "@openzeppelin/contracts/GSN/Context.sol";
import "@openzeppelin/contracts/ownership/Ownable.sol";

contract IRewardDistributionRecipient is Ownable {

    mapping (address => bool) public rewardDistribution;

    constructor(address[] memory _rewardDistributions) public {
        // NotifyHelper
        rewardDistribution[0xE20c31e3d08027F5AfACe84A3A46B7b3B165053c] = true;

        // FeeRewardForwarderV5
        rewardDistribution[0x153C544f72329c1ba521DDf5086cf2fA98C86676] = true;

        for(uint256 i = 0; i < _rewardDistributions.length; i++) {
          rewardDistribution[_rewardDistributions[i]] = true;
        }
    }

    function notifyTargetRewardAmount(address rewardToken, uint256 reward) external;
    function notifyRewardAmount(uint256 reward) external;

    modifier onlyRewardDistribution() {
        require(rewardDistribution[_msgSender()], "Caller is not reward distribution");
        _;
    }

    function setRewardDistribution(address[] calldata _newRewardDistribution, bool _flag)
        external
        onlyOwner
    {
        for(uint256 i = 0; i < _newRewardDistribution.length; i++){
          rewardDistribution[_newRewardDistribution[i]] = _flag;
        }
    }
}

contract PotPool is IRewardDistributionRecipient, Controllable, ERC20, ERC20Detailed {

    using Address for address;
    using SafeERC20 for IERC20;
    using SafeMath for uint256;

    address public lpToken;
    uint256 public duration; // making it not a constant is less gas efficient, but portable

    mapping(address => uint256) public stakedBalanceOf;

    mapping (address => bool) smartContractStakers;
    address[] public rewardTokens;
    mapping(address => uint256) public periodFinishForToken;
    mapping(address => uint256) public rewardRateForToken;
    mapping(address => uint256) public lastUpdateTimeForToken;
    mapping(address => uint256) public rewardPerTokenStoredForToken;
    mapping(address => mapping(address => uint256)) public userRewardPerTokenPaidForToken;
    mapping(address => mapping(address => uint256)) public rewardsForToken;

    event RewardAdded(address rewardToken, uint256 reward);
    event Staked(address indexed user, uint256 amount);
    event Withdrawn(address indexed user, uint256 amount);
    event RewardPaid(address indexed user, address rewardToken, uint256 reward);
    event RewardDenied(address indexed user, address rewardToken, uint256 reward);
    event SmartContractRecorded(address indexed smartContractAddress, address indexed smartContractInitiator);

    modifier updateRewards(address account) {
      for(uint256 i = 0; i < rewardTokens.length; i++ ){
        address rt = rewardTokens[i];
        rewardPerTokenStoredForToken[rt] = rewardPerToken(rt);
        lastUpdateTimeForToken[rt] = lastTimeRewardApplicable(rt);
        if (account != address(0)) {
            rewardsForToken[rt][account] = earned(rt, account);
            userRewardPerTokenPaidForToken[rt][account] = rewardPerTokenStoredForToken[rt];
        }
      }
      _;
    }

    modifier updateReward(address account, address rt){
      rewardPerTokenStoredForToken[rt] = rewardPerToken(rt);
      lastUpdateTimeForToken[rt] = lastTimeRewardApplicable(rt);
      if (account != address(0)) {
          rewardsForToken[rt][account] = earned(rt, account);
          userRewardPerTokenPaidForToken[rt][account] = rewardPerTokenStoredForToken[rt];
      }
      _;
    }

    /** View functions to respect old interface */
    function rewardToken() public view returns(address) {
      return rewardTokens[0];
    }

    function rewardPerToken() public view returns(uint256) {
      return rewardPerToken(rewardTokens[0]);
    }

    function periodFinish() public view returns(uint256) {
      return periodFinishForToken[rewardTokens[0]];
    }

    function rewardRate() public view returns(uint256) {
      return rewardRateForToken[rewardTokens[0]];
    }

    function lastUpdateTime() public view returns(uint256) {
      return lastUpdateTimeForToken[rewardTokens[0]];
    }

    function rewardPerTokenStored() public view returns(uint256) {
      return rewardPerTokenStoredForToken[rewardTokens[0]];
    }

    function userRewardPerTokenPaid(address user) public view returns(uint256) {
      return userRewardPerTokenPaidForToken[rewardTokens[0]][user];
    }

    function rewards(address user) public view returns(uint256) {
      return rewardsForToken[rewardTokens[0]][user];
    }

    // [Hardwork] setting the reward, lpToken, duration, and rewardDistribution for each pool
    constructor(
        address[] memory _rewardTokens,
        address _lpToken,
        uint256 _duration,
        address[] memory _rewardDistribution,
        address _storage,
        string memory _name,
        string memory _symbol,
        uint8 _decimals
      ) public
      ERC20Detailed(_name, _symbol, _decimals)
      IRewardDistributionRecipient(_rewardDistribution)
      Controllable(_storage) // only used for referencing the grey list
    {
        require(_decimals == ERC20Detailed(_lpToken).decimals(), "decimals has to be aligned with the lpToken");
        require(_rewardTokens.length != 0, "should initialize with at least 1 rewardToken");
        rewardTokens = _rewardTokens;
        lpToken = _lpToken;
        duration = _duration;
    }

    function lastTimeRewardApplicable(uint256 i) public view returns (uint256) {
        return lastTimeRewardApplicable(rewardTokens[i]);
    }

    function lastTimeRewardApplicable(address rt) public view returns (uint256) {
        return Math.min(block.timestamp, periodFinishForToken[rt]);
    }

    function lastTimeRewardApplicable() public view returns (uint256) {
        return lastTimeRewardApplicable(rewardTokens[0]);
    }

    function rewardPerToken(uint256 i) public view returns (uint256) {
        return rewardPerToken(rewardTokens[i]);
    }

    function rewardPerToken(address rt) public view returns (uint256) {
        if (totalSupply() == 0) {
            return rewardPerTokenStoredForToken[rt];
        }
        return
            rewardPerTokenStoredForToken[rt].add(
                lastTimeRewardApplicable(rt)
                    .sub(lastUpdateTimeForToken[rt])
                    .mul(rewardRateForToken[rt])
                    .mul(1e18)
                    .div(totalSupply())
            );
    }

    function earned(uint256 i, address account) public view returns (uint256) {
        return earned(rewardTokens[i], account);
    }

    function earned(address account) public view returns (uint256) {
        return earned(rewardTokens[0], account);
    }

    function earned(address rt, address account) public view returns (uint256) {
        return
            stakedBalanceOf[account]
                .mul(rewardPerToken(rt).sub(userRewardPerTokenPaidForToken[rt][account]))
                .div(1e18)
                .add(rewardsForToken[rt][account]);
    }

    function stake(uint256 amount) public updateRewards(msg.sender) {
        require(amount > 0, "Cannot stake 0");
        recordSmartContract();
        super._mint(msg.sender, amount); // ERC20 is used as a staking receipt
        stakedBalanceOf[msg.sender] = stakedBalanceOf[msg.sender].add(amount);
        IERC20(lpToken).safeTransferFrom(msg.sender, address(this), amount);
        emit Staked(msg.sender, amount);
    }

    function withdraw(uint256 amount) public updateRewards(msg.sender) {
        require(amount > 0, "Cannot withdraw 0");
        super._burn(msg.sender, amount);
        stakedBalanceOf[msg.sender] = stakedBalanceOf[msg.sender].sub(amount);
        IERC20(lpToken).safeTransfer(msg.sender, amount);
        emit Withdrawn(msg.sender, amount);
    }

    function exit() external {
        withdraw(Math.min(stakedBalanceOf[msg.sender], balanceOf(msg.sender)));
        getAllRewards();
    }

    /// A push mechanism for accounts that have not claimed their rewards for a long time.
    /// The implementation is semantically analogous to getReward(), but uses a push pattern
    /// instead of pull pattern.
    function pushAllRewards(address recipient) public updateRewards(recipient) onlyGovernance {
      bool rewardPayout = (!smartContractStakers[recipient] || !IController(controller()).greyList(recipient));
      for(uint256 i = 0 ; i < rewardTokens.length; i++ ){
        uint256 reward = earned(rewardTokens[i], recipient);
        if (reward > 0) {
            rewardsForToken[rewardTokens[i]][recipient] = 0;
            // If it is a normal user and not smart contract,
            // then the requirement will pass
            // If it is a smart contract, then
            // make sure that it is not on our greyList.
            if (rewardPayout) {
                IERC20(rewardTokens[i]).safeTransfer(recipient, reward);
                emit RewardPaid(recipient, rewardTokens[i], reward);
            } else {
                emit RewardDenied(recipient, rewardTokens[i], reward);
            }
        }
      }
    }

    function getAllRewards() public updateRewards(msg.sender) {
      recordSmartContract();
      bool rewardPayout = (!smartContractStakers[msg.sender] || !IController(controller()).greyList(msg.sender));
      for(uint256 i = 0 ; i < rewardTokens.length; i++ ){
        _getRewardAction(rewardTokens[i], rewardPayout);
      }
    }

    function getReward(address rt) public updateReward(msg.sender, rt) {
      recordSmartContract();
      _getRewardAction(
        rt,
        // don't payout if it is a grey listed smart contract
        (!smartContractStakers[msg.sender] || !IController(controller()).greyList(msg.sender))
      );
    }

    function getReward() public {
      getReward(rewardTokens[0]);
    }

    function _getRewardAction(address rt, bool rewardPayout) internal {
      uint256 reward = earned(rt, msg.sender);
      if (reward > 0 && IERC20(rt).balanceOf(address(this)) >= reward ) {
          rewardsForToken[rt][msg.sender] = 0;
          // If it is a normal user and not smart contract,
          // then the requirement will pass
          // If it is a smart contract, then
          // make sure that it is not on our greyList.
          if (rewardPayout) {
              IERC20(rt).safeTransfer(msg.sender, reward);
              emit RewardPaid(msg.sender, rt, reward);
          } else {
              emit RewardDenied(msg.sender, rt, reward);
          }
      }
    }

    function addRewardToken(address rt) public onlyGovernance {
      require(getRewardTokenIndex(rt) == uint256(-1), "Reward token already exists");
      rewardTokens.push(rt);
    }

    function removeRewardToken(address rt) public onlyGovernance {
      uint256 i = getRewardTokenIndex(rt);
      require(i != uint256(-1), "Reward token does not exists");
      require(periodFinishForToken[rewardTokens[i]] < block.timestamp, "Can only remove when the reward period has passed");
      require(rewardTokens.length > 1, "Cannot remove the last reward token");
      uint256 lastIndex = rewardTokens.length - 1;

      // swap
      rewardTokens[i] = rewardTokens[lastIndex];

      // delete last element
      rewardTokens.length--;
    }

    // If the return value is MAX_UINT256, it means that
    // the specified reward token is not in the list
    function getRewardTokenIndex(address rt) public view returns(uint256) {
      for(uint i = 0 ; i < rewardTokens.length ; i++){
        if(rewardTokens[i] == rt)
          return i;
      }
      return uint256(-1);
    }

    function notifyTargetRewardAmount(address _rewardToken, uint256 reward)
        public
        onlyRewardDistribution
        updateRewards(address(0))
    {
        // overflow fix according to https://sips.synthetix.io/sips/sip-77
        require(reward < uint(-1) / 1e18, "the notified reward cannot invoke multiplication overflow");

        uint256 i = getRewardTokenIndex(_rewardToken);
        require(i != uint256(-1), "rewardTokenIndex not found");

        if (block.timestamp >= periodFinishForToken[_rewardToken]) {
            rewardRateForToken[_rewardToken] = reward.div(duration);
        } else {
            uint256 remaining = periodFinishForToken[_rewardToken].sub(block.timestamp);
            uint256 leftover = remaining.mul(rewardRateForToken[_rewardToken]);
            rewardRateForToken[_rewardToken] = reward.add(leftover).div(duration);
        }
        lastUpdateTimeForToken[_rewardToken] = block.timestamp;
        periodFinishForToken[_rewardToken] = block.timestamp.add(duration);
        emit RewardAdded(_rewardToken, reward);
    }

    function notifyRewardAmount(uint256 reward)
        external
        onlyRewardDistribution
        updateRewards(address(0))
    {
      notifyTargetRewardAmount(rewardTokens[0], reward);
    }

    function rewardTokensLength() public view returns(uint256){
      return rewardTokens.length;
    }

    // Harvest Smart Contract recording
    function recordSmartContract() internal {
      if( tx.origin != msg.sender ) {
        smartContractStakers[msg.sender] = true;
        emit SmartContractRecorded(msg.sender, tx.origin);
      }
    }

}

File 2 of 14 : Controllable.sol
pragma solidity 0.5.16;

import "./Governable.sol";

contract Controllable is Governable {

  constructor(address _storage) Governable(_storage) public {
  }

  modifier onlyController() {
    require(store.isController(msg.sender), "Not a controller");
    _;
  }

  modifier onlyControllerOrGovernance(){
    require((store.isController(msg.sender) || store.isGovernance(msg.sender)),
      "The caller must be controller or governance");
    _;
  }

  function controller() public view returns (address) {
    return store.controller();
  }
}

File 3 of 14 : IController.sol
pragma solidity 0.5.16;

interface IController {

    event SharePriceChangeLog(
      address indexed vault,
      address indexed strategy,
      uint256 oldSharePrice,
      uint256 newSharePrice,
      uint256 timestamp
    );

    // [Grey list]
    // An EOA can safely interact with the system no matter what.
    // If you're using Metamask, you're using an EOA.
    // Only smart contracts may be affected by this grey list.
    //
    // This contract will not be able to ban any EOA from the system
    // even if an EOA is being added to the greyList, he/she will still be able
    // to interact with the whole system as if nothing happened.
    // Only smart contracts will be affected by being added to the greyList.
    // This grey list is only used in Vault.sol, see the code there for reference
    function greyList(address _target) external view returns(bool);

    function addVaultAndStrategy(address _vault, address _strategy) external;
    function doHardWork(address _vault) external;
    function hasVault(address _vault) external returns(bool);

    function salvage(address _token, uint256 amount) external;
    function salvageStrategy(address _strategy, address _token, uint256 amount) external;

    function notifyFee(address _underlying, uint256 fee) external;
    function profitSharingNumerator() external view returns (uint256);
    function profitSharingDenominator() external view returns (uint256);

    function feeRewardForwarder() external view returns(address);
    function setFeeRewardForwarder(address _value) external;

    function addHardWorker(address _worker) external;
}

File 4 of 14 : IERC20.sol
pragma solidity ^0.5.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP. Does not include
 * the optional functions; to access them see {ERC20Detailed}.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

File 5 of 14 : ERC20.sol
pragma solidity ^0.5.0;

import "../../GSN/Context.sol";
import "./IERC20.sol";
import "../../math/SafeMath.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20Mintable}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin guidelines: functions revert instead
 * of returning `false` on failure. This behavior is nonetheless conventional
 * and does not conflict with the expectations of ERC20 applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20 {
    using SafeMath for uint256;

    mapping (address => uint256) private _balances;

    mapping (address => mapping (address => uint256)) private _allowances;

    uint256 private _totalSupply;

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20};
     *
     * Requirements:
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for `sender`'s tokens of at least
     * `amount`.
     */
    function transferFrom(address sender, address recipient, uint256 amount) public returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }

    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(address sender, address recipient, uint256 amount) internal {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements
     *
     * - `to` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal {
        require(account != address(0), "ERC20: mint to the zero address");

        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal {
        require(account != address(0), "ERC20: burn from the zero address");

        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens.
     *
     * This is internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 amount) internal {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`.`amount` is then deducted
     * from the caller's allowance.
     *
     * See {_burn} and {_approve}.
     */
    function _burnFrom(address account, uint256 amount) internal {
        _burn(account, amount);
        _approve(account, _msgSender(), _allowances[account][_msgSender()].sub(amount, "ERC20: burn amount exceeds allowance"));
    }
}

File 6 of 14 : ERC20Detailed.sol
pragma solidity ^0.5.0;

import "./IERC20.sol";

/**
 * @dev Optional functions from the ERC20 standard.
 */
contract ERC20Detailed is IERC20 {
    string private _name;
    string private _symbol;
    uint8 private _decimals;

    /**
     * @dev Sets the values for `name`, `symbol`, and `decimals`. All three of
     * these values are immutable: they can only be set once during
     * construction.
     */
    constructor (string memory name, string memory symbol, uint8 decimals) public {
        _name = name;
        _symbol = symbol;
        _decimals = decimals;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5,05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view returns (uint8) {
        return _decimals;
    }
}

File 7 of 14 : SafeERC20.sol
pragma solidity ^0.5.0;

import "./IERC20.sol";
import "../../math/SafeMath.sol";
import "../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 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 SafeERC20 for ERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using SafeMath for uint256;
    using Address for address;

    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    function safeApprove(IERC20 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),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(IERC20 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(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: 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(IERC20 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.

        // A Solidity high level call has three parts:
        //  1. The target address is checked to verify it contains contract code
        //  2. The call itself is made, and success asserted
        //  3. The return value is decoded, which in turn checks the size of the returned data.
        // solhint-disable-next-line max-line-length
        require(address(token).isContract(), "SafeERC20: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = address(token).call(data);
        require(success, "SafeERC20: low-level call failed");

        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

File 8 of 14 : SafeMath.sol
pragma solidity ^0.5.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     * - Subtraction cannot overflow.
     *
     * _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;
    }
}

File 9 of 14 : Math.sol
pragma solidity ^0.5.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a >= b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow, so we distribute
        return (a / 2) + (b / 2) + ((a % 2 + b % 2) / 2);
    }
}

File 10 of 14 : Address.sol
pragma solidity ^0.5.5;

/**
 * @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) {
        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts
        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
        // for accounts without code, i.e. `keccak256('')`
        bytes32 codehash;
        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
        // solhint-disable-next-line no-inline-assembly
        assembly { codehash := extcodehash(account) }
        return (codehash != accountHash && codehash != 0x0);
    }

    /**
     * @dev Converts an `address` into `address payable`. Note that this is
     * simply a type cast: the actual underlying value is not changed.
     *
     * _Available since v2.4.0._
     */
    function toPayable(address account) internal pure returns (address payable) {
        return address(uint160(account));
    }

    /**
     * @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].
     *
     * _Available since v2.4.0._
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

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

File 11 of 14 : Context.sol
pragma solidity ^0.5.0;

/*
 * @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.
 */
contract Context {
    // Empty internal constructor, to prevent people from mistakenly deploying
    // an instance of this contract, which should be used via inheritance.
    constructor () internal { }
    // solhint-disable-previous-line no-empty-blocks

    function _msgSender() internal view returns (address payable) {
        return msg.sender;
    }

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

File 12 of 14 : Ownable.sol
pragma solidity ^0.5.0;

import "../GSN/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.
 *
 * 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.
 */
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 returns (address) {
        return _owner;
    }

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

    /**
     * @dev Returns true if the caller is the current owner.
     */
    function isOwner() public view returns (bool) {
        return _msgSender() == _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 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 onlyOwner {
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     */
    function _transferOwnership(address newOwner) internal {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

File 13 of 14 : Governable.sol
pragma solidity 0.5.16;

import "./Storage.sol";

contract Governable {

  Storage public store;

  constructor(address _store) public {
    require(_store != address(0), "new storage shouldn't be empty");
    store = Storage(_store);
  }

  modifier onlyGovernance() {
    require(store.isGovernance(msg.sender), "Not governance");
    _;
  }

  function setStorage(address _store) public onlyGovernance {
    require(_store != address(0), "new storage shouldn't be empty");
    store = Storage(_store);
  }

  function governance() public view returns (address) {
    return store.governance();
  }
}

File 14 of 14 : Storage.sol
pragma solidity 0.5.16;

contract Storage {

  address public governance;
  address public controller;

  constructor() public {
    governance = msg.sender;
  }

  modifier onlyGovernance() {
    require(isGovernance(msg.sender), "Not governance");
    _;
  }

  function setGovernance(address _governance) public onlyGovernance {
    require(_governance != address(0), "new governance shouldn't be empty");
    governance = _governance;
  }

  function setController(address _controller) public onlyGovernance {
    require(_controller != address(0), "new controller shouldn't be empty");
    controller = _controller;
  }

  function isGovernance(address account) public view returns (bool) {
    return account == governance;
  }

  function isController(address account) public view returns (bool) {
    return account == controller;
  }
}

Settings
{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  },
  "metadata": {
    "useLiteralContent": true
  },
  "libraries": {}
}

Contract Security Audit

Contract ABI

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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.