Contract 0x1a877b68bda77d78eea607443ccde667b31b0cdf 3

Contract Overview

Piggy Finance: PIGGY Token
Balance:
0 AVAX

AVAX Value:
$0.00

Token:
Txn Hash Method
Block
From
To
Value [Txn Fee]
0xaeacdafd8eb702583add5c35eeb1a1dbb01243b3a8940cb38cc018a17b37a015Transfer255535122023-01-29 5:45:435 days 5 hrs ago0xbe0749f7455c07dceddf3edba713a098f06a2706 IN  Piggy Finance: PIGGY Token0 AVAX0.0009163965 26.5
0xaa23dac17d3da4a07fe1bdfdf78814cf352a84b5aef1d2317d8b11e55910b98dApprove255427922023-01-28 23:43:425 days 11 hrs ago0x18b2555b76a24ce30fe678d601da01d57c9f1879 IN  Piggy Finance: PIGGY Token0 AVAX0.001233628 26.5
0x200cef0aedba561aeea15bff2bea800955c1d9ec5509b077a56c2b7d7281940dApprove254222962023-01-26 3:39:548 days 7 hrs ago0x238643d4106c7c6206f8dc31acb59cd24c979d12 IN  Piggy Finance: PIGGY Token0 AVAX0.002128144 46
0xdc752a6346c8084c2e5b80cec7fc21921600bd11a597e119ccebd3ac19809e64Approve254222082023-01-26 3:36:398 days 7 hrs ago0x238643d4106c7c6206f8dc31acb59cd24c979d12 IN  Piggy Finance: PIGGY Token0 AVAX0.002141392 46
0x3f592f257c7cc46a445d4ae5c21d21eea375d87f4dee9d39ed86b7a68ecc3642Approve254220052023-01-26 3:29:428 days 7 hrs ago0x238643d4106c7c6206f8dc31acb59cd24c979d12 IN  Piggy Finance: PIGGY Token0 AVAX0.002141392 46
0xf403804549781378bb2334a1176a513ba143acbc88c19f843f7450ef042ba228Approve254209732023-01-26 2:53:358 days 8 hrs ago0x9cf796fbb684ee3d22e3346faabd62371a141037 IN  Piggy Finance: PIGGY Token0 AVAX0.0008077211 27.425
0xbd79a3e0d0b268e67694b343b526bf8db3ccf8d70880f890be884cdb925994a7Approve254164302023-01-26 0:17:298 days 10 hrs ago0x9cf796fbb684ee3d22e3346faabd62371a141037 IN  Piggy Finance: PIGGY Token0 AVAX0.001265752721 27.35225
0x035d6040ae62f117b03173813a82228c5e64e3545e0a81451063b636626ad07eApprove253404782023-01-24 5:07:0610 days 5 hrs ago0xf6886bfba753f5f2e74cb4f0463855745c3dceb2 IN  Piggy Finance: PIGGY Token0 AVAX0.00072237 27.5
0x55348b1bd24a1e24160ac8f1177f629bb295b727685b8a3eea7dea91c2767e94Approve253404772023-01-24 5:07:0410 days 5 hrs ago0xf6886bfba753f5f2e74cb4f0463855745c3dceb2 IN  Piggy Finance: PIGGY Token0 AVAX0.00079937 27.5
0x0d1c96e6b518cf77c35c6ec9768feaa0aaee0df23f17e6bee8bf25d6c131af0cApprove252874892023-01-22 23:01:4211 days 11 hrs ago0x237d71b62286db0f101c4709ee5b02adf5d74738 IN  Piggy Finance: PIGGY Token0 AVAX0.000728525
0xcaae11fb37e751bdd6248f4ce7de661d975c22f14e792da1ad7cdea1482310fdApprove252832992023-01-22 20:40:1911 days 14 hrs ago0xca4afc47632144387535a2cdac265cbdffdf5496 IN  Piggy Finance: PIGGY Token0 AVAX0.00084244519 28.898366839
0x0ff19cc6f96853aee7d0087bd48fc5c0c73852bf30607e431eca904ab76d612bApprove252832802023-01-22 20:39:5411 days 14 hrs ago0xca4afc47632144387535a2cdac265cbdffdf5496 IN  Piggy Finance: PIGGY Token0 AVAX0.001268132 27.425
0x60d0cb4a17362f83e13d7b1c954a21fafe7e3f01938ffbdea36403243f5dd5adApprove252774352023-01-22 17:25:2311 days 17 hrs ago0x3083e5a32550e76f5b83b9f1096ccc481a5f360e IN  Piggy Finance: PIGGY Token0 AVAX0.001259482546 27.055390664
0xfd20f8093d739877eaa08b0357ff72bc990a9354af0deb9a3e9fbed3c2462fd2Approve252459322023-01-21 23:36:2712 days 11 hrs ago0x4efce69a3460620556c4ea933192764d984b6ab5 IN  Piggy Finance: PIGGY Token0 AVAX0.0008127396 27.971489541
0x06f03805d18826061c7a2821b8e434acfe2b11205bf352804af4b3ace55aaf0bApprove252458792023-01-21 23:34:4212 days 11 hrs ago0x4efce69a3460620556c4ea933192764d984b6ab5 IN  Piggy Finance: PIGGY Token0 AVAX0.001232053681 42.385223664
0x41728f0f9b6790bf97f9ed5045910014d811561e3c5c859823bc19d941e157d3Approve252458732023-01-21 23:34:2912 days 11 hrs ago0x4efce69a3460620556c4ea933192764d984b6ab5 IN  Piggy Finance: PIGGY Token0 AVAX0.001216988447 41.866948098
0x4cea93a20f2ede93a80ccfedc4b88cc20deec51ea3cacc0143695618166d1ae9Approve250096102023-01-16 9:18:0718 days 1 hr ago0x18b2555b76a24ce30fe678d601da01d57c9f1879 IN  Piggy Finance: PIGGY Token0 AVAX0.001233628 26.5
0x32d6ac353cd7901b835964141305aae315b315268e336fba1cfa3d0b161bad73Approve249624102023-01-15 6:37:2219 days 4 hrs ago0x9c216d9189e122931814b32731e56783361601bf IN  Piggy Finance: PIGGY Token0 AVAX0.000770302 26.5
0xb80cc1e0d03f61fc6f5bc50bfcc22361fa482774388d6f5cb57182354e8c8d15Approve249624002023-01-15 6:37:0219 days 4 hrs ago0x9c216d9189e122931814b32731e56783361601bf IN  Piggy Finance: PIGGY Token0 AVAX0.000770302 26.5
0xe326a97e51d6521d45a13a5c8cb82051ac6f15154ed3dbe80cff2a6af87dff3cApprove249439152023-01-14 20:07:4119 days 14 hrs ago0x4b8b235c511f0c830264c7761520b1f9ad441716 IN  Piggy Finance: PIGGY Token0 AVAX0.001256904 27
0x644d9330931e8c49d7e9ab70e8c412f774073001f2ac54f8d947e454c800f2afApprove249213082023-01-14 7:33:1920 days 3 hrs ago0x7cee21fd74cff3b91c1c7251b7a4294349a0da79 IN  Piggy Finance: PIGGY Token0 AVAX0.001233628 26.5
0x2f415132c6c3ffb66ef888578ba20d0e0c47c7815ea662a79eeba2202d524d8bApprove249031592023-01-13 21:34:4320 days 13 hrs ago0x09732b866f1496a8f8923a99757b3ec0ba0e1d4b IN  Piggy Finance: PIGGY Token0 AVAX0.000770302 26.5
0x93a0b4ae1e5a351de51701c4c3426fedbbc28c8fe58a6e5369f9112366e7c862Approve249031542023-01-13 21:34:3320 days 13 hrs ago0x09732b866f1496a8f8923a99757b3ec0ba0e1d4b IN  Piggy Finance: PIGGY Token0 AVAX0.0007968608 27.425
0xdd4c033704f24a28746f8efc056e4d2e37bd00a0f587fe1d0044a50dbcd909ecApprove248820372023-01-13 9:43:0021 days 1 hr ago0xe818d7cb24fd13bf4f6b8ca970ab2046417b215e IN  Piggy Finance: PIGGY Token0 AVAX0.000770302 26.5
0x1be5f4f0c2dbced5ce830228aac5e101ad73d60b64df7d2714d5682e822801bbApprove248676762023-01-13 1:30:0421 days 9 hrs ago0x4b8b235c511f0c830264c7761520b1f9ad441716 IN  Piggy Finance: PIGGY Token0 AVAX0.001226314 26.5
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OVERVIEW

An algorithmic stablecoin on Avalanche, pegged to the price of 1 AVAX via seigniorage.

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Contract Source Code Verified (Exact Match)

Contract Name:
Piggy

Compiler Version
v0.6.12+commit.27d51765

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion
File 1 of 12 : Piggy.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

import "@openzeppelin/contracts/token/ERC20/ERC20Burnable.sol";
import "@openzeppelin/contracts/math/Math.sol";

import "./lib/SafeMath8.sol";
import "./owner/Operator.sol";
import "./interfaces/IOracle.sol";

/*
 ________  ___  ________  ________      ___    ___      ________ ___  ________   ________  ________   ________  _______      
|\   __  \|\  \|\   ____\|\   ____\    |\  \  /  /|    |\  _____\\  \|\   ___  \|\   __  \|\   ___  \|\   ____\|\  ___ \     
\ \  \|\  \ \  \ \  \___|\ \  \___|    \ \  \/  / /    \ \  \__/\ \  \ \  \\ \  \ \  \|\  \ \  \\ \  \ \  \___|\ \   __/|    
 \ \   ____\ \  \ \  \  __\ \  \  ___   \ \    / /      \ \   __\\ \  \ \  \\ \  \ \   __  \ \  \\ \  \ \  \    \ \  \_|/__  
  \ \  \___|\ \  \ \  \|\  \ \  \|\  \   \/  /  /        \ \  \_| \ \  \ \  \\ \  \ \  \ \  \ \  \\ \  \ \  \____\ \  \_|\ \ 
   \ \__\    \ \__\ \_______\ \_______\__/  / /           \ \__\   \ \__\ \__\\ \__\ \__\ \__\ \__\\ \__\ \_______\ \_______\
    \|__|     \|__|\|_______|\|_______|\___/ /             \|__|    \|__|\|__| \|__|\|__|\|__|\|__| \|__|\|_______|\|_______|
                                      \|___|/                                                                                
                                                                                                                             
    https://piggyfinance.io
*/
contract Piggy is ERC20Burnable, Operator {
    using SafeMath8 for uint8;
    using SafeMath for uint256;

    // Supply used to launch in LP
    uint256 public constant INITIAL_LAUNCH_DISTRIBUTION = 100 ether;

    // Have the rewards been distributed to the pools
    bool public rewardPoolDistributed = false;

    /* ================= Taxation =============== */
    // Address of the Oracle
    address public piggyOracle;
    // Address of the Tax Office
    address public taxOffice;

    // Current tax rate
    uint256 public taxRate;
    // Price threshold below which taxes will get burned
    uint256 public burnThreshold = 1.10e18;
    // Address of the tax collector wallet
    address public taxCollectorAddress;

    // Should the taxes be calculated using the tax tiers
    bool public autoCalculateTax;

    // Tax Tiers
    uint256[] public taxTiersTwaps = [0, 5e17, 6e17, 7e17, 8e17, 9e17, 9.5e17, 1e18, 1.05e18, 1.10e18, 1.20e18, 1.30e18, 1.40e18, 1.50e18];
    uint256[] public taxTiersRates = [2000, 1900, 1800, 1700, 1600, 1500, 1500, 1500, 1500, 1400, 900, 400, 200, 100];

    // Sender addresses excluded from Tax
    mapping(address => bool) public excludedAddresses;

    event TaxOfficeTransferred(address oldAddress, address newAddress);

    modifier onlyTaxOffice() {
        require(taxOffice == msg.sender, "Caller is not the tax office");
        _;
    }

    modifier onlyOperatorOrTaxOffice() {
        require(isOperator() || taxOffice == msg.sender, "Caller is not the operator or the tax office");
        _;
    }

    /**
     * @notice Constructs the PIGGY ERC-20 contract.
     */
    constructor(uint256 _taxRate, address _taxCollectorAddress) public ERC20("PIGGY", "PIGGY") {
        // Mints 1 PIGGY to contract creator for initial pool setup
        require(_taxRate < 10000, "tax equal or bigger to 100%");
        require(_taxCollectorAddress != address(0), "tax collector address must be non-zero address!");

        excludeAddress(address(this));

        _mint(msg.sender, 1 ether);
        taxRate = _taxRate;
        taxCollectorAddress = _taxCollectorAddress;
    }

    /* ============= Taxation ============= */

    function getTaxTiersTwapsCount() public view returns (uint256 count) {
        return taxTiersTwaps.length;
    }

    function getTaxTiersRatesCount() public view returns (uint256 count) {
        return taxTiersRates.length;
    }

    function isAddressExcluded(address _address) public view returns (bool) {
        return excludedAddresses[_address];
    }

    function setTaxTiersTwap(uint8 _index, uint256 _value) public onlyTaxOffice returns (bool) {
        require(_index >= 0, "Index has to be higher than 0");
        require(_index < getTaxTiersTwapsCount(), "Index has to lower than count of tax tiers");
        if (_index > 0) {
            require(_value > taxTiersTwaps[_index - 1]);
        }
        if (_index < getTaxTiersTwapsCount().sub(1)) {
            require(_value < taxTiersTwaps[_index + 1]);
        }
        taxTiersTwaps[_index] = _value;
        return true;
    }

    function setTaxTiersRate(uint8 _index, uint256 _value) public onlyTaxOffice returns (bool) {
        require(_index >= 0, "Index has to be higher than 0");
        require(_index < getTaxTiersRatesCount(), "Index has to lower than count of tax tiers");
        taxTiersRates[_index] = _value;
        return true;
    }

    function setBurnThreshold(uint256 _burnThreshold) public onlyTaxOffice returns (bool) {
        burnThreshold = _burnThreshold;
    }

    function _getPiggyPrice() internal view returns (uint256 _piggyPrice) {
        try IOracle(piggyOracle).consult(address(this), 1e18) returns (uint144 _price) {
            return uint256(_price);
        } catch {
            revert("Piggy: failed to fetch PIGGY price from Oracle");
        }
    }

    function _updateTaxRate(uint256 _piggyPrice) internal returns (uint256){
        if (autoCalculateTax) {
            for (uint8 tierId = uint8(getTaxTiersTwapsCount()).sub(1); tierId >= 0; --tierId) {
                if (_piggyPrice >= taxTiersTwaps[tierId]) {
                    require(taxTiersRates[tierId] < 10000, "tax equal or bigger to 100%");
                    taxRate = taxTiersRates[tierId];
                    return taxTiersRates[tierId];
                }
            }
        }
    }

    function enableAutoCalculateTax() public onlyTaxOffice {
        autoCalculateTax = true;
    }

    function disableAutoCalculateTax() public onlyTaxOffice {
        autoCalculateTax = false;
    }

    function setPiggyOracle(address _piggyOracle) public onlyOperatorOrTaxOffice {
        require(_piggyOracle != address(0), "oracle address cannot be 0 address");
        piggyOracle = _piggyOracle;
    }

    function setTaxOffice(address _taxOffice) public onlyOperatorOrTaxOffice {
        require(_taxOffice != address(0), "tax office address cannot be 0 address");
        emit TaxOfficeTransferred(taxOffice, _taxOffice);
        taxOffice = _taxOffice;
    }

    function setTaxCollectorAddress(address _taxCollectorAddress) public onlyTaxOffice {
        require(_taxCollectorAddress != address(0), "tax collector address must be non-zero address");
        taxCollectorAddress = _taxCollectorAddress;
    }

    function setTaxRate(uint256 _taxRate) public onlyTaxOffice {
        require(!autoCalculateTax, "auto calculate tax cannot be enabled");
        require(_taxRate < 10000, "tax equal or bigger to 100%");
        taxRate = _taxRate;
    }

    function excludeAddress(address _address) public onlyOperatorOrTaxOffice returns (bool) {
        require(!excludedAddresses[_address], "address can't be excluded");
        excludedAddresses[_address] = true;
        return true;
    }

    function includeAddress(address _address) public onlyOperatorOrTaxOffice returns (bool) {
        require(excludedAddresses[_address], "address can't be included");
        excludedAddresses[_address] = false;
        return true;
    }

    /**
     * @notice Operator mints PIGGY to a recipient
     * @param recipient_ The address of recipient
     * @param amount_ The amount of PIGGY to mint to
     * @return whether the process has been done
     */
    function mint(address recipient_, uint256 amount_) public onlyOperator returns (bool) {
        uint256 balanceBefore = balanceOf(recipient_);
        _mint(recipient_, amount_);
        uint256 balanceAfter = balanceOf(recipient_);

        return balanceAfter > balanceBefore;
    }

    function burn(uint256 amount) public override {
        super.burn(amount);
    }

    function burnFrom(address account, uint256 amount) public override onlyOperator {
        super.burnFrom(account, amount);
    }

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public override returns (bool) {
        uint256 currentTaxRate = 0;
        bool burnTax = false;

        if (autoCalculateTax) {
            uint256 currentPiggyPrice = _getPiggyPrice();
            currentTaxRate = _updateTaxRate(currentPiggyPrice);
            if (currentPiggyPrice < burnThreshold) {
                burnTax = true;
            }
        }


        if (currentTaxRate == 0 || excludedAddresses[sender]) {
            _transfer(sender, recipient, amount);
        } else {
            _transferWithTax(sender, recipient, amount, burnTax);
        }

        _approve(sender, _msgSender(), allowance(sender, _msgSender()).sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }

    function _transferWithTax(
        address sender,
        address recipient,
        uint256 amount,
        bool burnTax
    ) internal returns (bool) {
        uint256 taxAmount = amount.mul(taxRate).div(10000);
        uint256 amountAfterTax = amount.sub(taxAmount);

        if(burnTax) {
            // Burn tax
            super.burnFrom(sender, taxAmount);
        } else {
            // Transfer tax to tax collector
            _transfer(sender, taxCollectorAddress, taxAmount);
        }

        // Transfer amount after tax to recipient
        _transfer(sender, recipient, amountAfterTax);

        return true;
    }

    /**
     * @notice distribute to reward pool (only once)
     */
    function distributeReward(
        address _genesisPool
    ) external onlyOperator {
        require(!rewardPoolDistributed, "only can distribute once");
        require(_genesisPool != address(0), "!_genesisPool");
        rewardPoolDistributed = true;
        _mint(_genesisPool, INITIAL_LAUNCH_DISTRIBUTION);
    }

    function governanceRecoverUnsupported(
        IERC20 _token,
        uint256 _amount,
        address _to
    ) external onlyOperator {
        _token.transfer(_to, _amount);
    }
}

File 2 of 12 : ERC20Burnable.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

import "../../GSN/Context.sol";
import "./ERC20.sol";

/**
 * @dev Extension of {ERC20} that allows token holders to destroy both their own
 * tokens and those that they have an allowance for, in a way that can be
 * recognized off-chain (via event analysis).
 */
abstract contract ERC20Burnable is Context, ERC20 {
    /**
     * @dev Destroys `amount` tokens from the caller.
     *
     * See {ERC20-_burn}.
     */
    function burn(uint256 amount) public virtual {
        _burn(_msgSender(), amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, deducting from the caller's
     * allowance.
     *
     * See {ERC20-_burn} and {ERC20-allowance}.
     *
     * Requirements:
     *
     * - the caller must have allowance for ``accounts``'s tokens of at least
     * `amount`.
     */
    function burnFrom(address account, uint256 amount) public virtual {
        uint256 decreasedAllowance = allowance(account, _msgSender()).sub(amount, "ERC20: burn amount exceeds allowance");

        _approve(account, _msgSender(), decreasedAllowance);
        _burn(account, amount);
    }
}

File 3 of 12 : Math.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @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 4 of 12 : SafeMath8.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

/**
 * @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 SafeMath8 {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint8 a, uint8 b) internal pure returns (uint8) {
        uint8 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(uint8 a, uint8 b) internal pure returns (uint8) {
        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.
     */
    function sub(uint8 a, uint8 b, string memory errorMessage) internal pure returns (uint8) {
        require(b <= a, errorMessage);
        uint8 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(uint8 a, uint8 b) internal pure returns (uint8) {
        // 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;
        }

        uint8 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(uint8 a, uint8 b) internal pure returns (uint8) {
        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.
     */
    function div(uint8 a, uint8 b, string memory errorMessage) internal pure returns (uint8) {
        require(b > 0, errorMessage);
        uint8 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(uint8 a, uint8 b) internal pure returns (uint8) {
        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.
     */
    function mod(uint8 a, uint8 b, string memory errorMessage) internal pure returns (uint8) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

File 5 of 12 : Operator.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

import "@openzeppelin/contracts/GSN/Context.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

contract Operator is Context, Ownable {
    address private _operator;

    event OperatorTransferred(address indexed previousOperator, address indexed newOperator);

    constructor() internal {
        _operator = _msgSender();
        emit OperatorTransferred(address(0), _operator);
    }

    function operator() public view returns (address) {
        return _operator;
    }

    modifier onlyOperator() {
        require(_operator == msg.sender, "operator: caller is not the operator");
        _;
    }

    function isOperator() public view returns (bool) {
        return _msgSender() == _operator;
    }

    function transferOperator(address newOperator_) public onlyOwner {
        _transferOperator(newOperator_);
    }

    function _transferOperator(address newOperator_) internal {
        require(newOperator_ != address(0), "operator: zero address given for new operator");
        emit OperatorTransferred(address(0), newOperator_);
        _operator = newOperator_;
    }
}

File 6 of 12 : IOracle.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

interface IOracle {
    function update() external;

    function consult(address _token, uint256 _amountIn) external view returns (uint144 amountOut);

    function twap(address _token, uint256 _amountIn) external view returns (uint144 _amountOut);
}

File 7 of 12 : Context.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }

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

File 8 of 12 : ERC20.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

import "../../GSN/Context.sol";
import "./IERC20.sol";
import "../../math/SafeMath.sol";
import "../../utils/Address.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 {ERC20PresetMinterPauser}.
 *
 * 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;
    using Address for address;

    mapping (address => uint256) private _balances;

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

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;
    uint8 private _decimals;

    /**
     * @dev Sets the values for {name} and {symbol}, initializes {decimals} with
     * a default value of 18.
     *
     * To select a different value for {decimals}, use {_setupDecimals}.
     *
     * All three of these values are immutable: they can only be set once during
     * construction.
     */
    constructor (string memory name, string memory symbol) public {
        _name = name;
        _symbol = symbol;
        _decimals = 18;
    }

    /**
     * @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. This is the value {ERC20} uses, unless {_setupDecimals} is
     * called.
     *
     * 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;
    }

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

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view override 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 virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

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

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override 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 virtual override 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 virtual 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 virtual 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 virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        _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 virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _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 virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        _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 virtual {
        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 Sets {decimals} to a value other than the default one of 18.
     *
     * WARNING: This function should only be called from the constructor. Most
     * applications that interact with token contracts will not expect
     * {decimals} to ever change, and may work incorrectly if it does.
     */
    function _setupDecimals(uint8 decimals_) internal {
        _decimals = decimals_;
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be to transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }
}

File 9 of 12 : IERC20.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
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 10 of 12 : SafeMath.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

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

File 11 of 12 : Address.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.6.2;

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

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

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

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

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

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

    function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: weiValue }(data);
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

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

File 12 of 12 : Ownable.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

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.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
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(_owner == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

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

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

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

Contract ABI

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ddress"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOperator_","type":"address"}],"name":"transferOperator","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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

00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000f1434fdbad702040660d8cf36334bf1d0e583fb

-----Decoded View---------------
Arg [0] : _taxRate (uint256): 0
Arg [1] : _taxCollectorAddress (address): 0x0f1434fdbad702040660d8cf36334bf1d0e583fb

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [1] : 0000000000000000000000000f1434fdbad702040660d8cf36334bf1d0e583fb


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