Contract 0x44Af736495544a726ED15CB0EBe2d87a6bCC1832 1

Contract Overview

Balance:
0 Ether

Token:
Txn Hash
Method
Block
From
To
Value
0x94ae659edc1780c6daed5f6f9f8bf524758bec28daa3e7c1b38c9ce57a1b3cc3Mint323528152022-06-24 13:12:0410 days 11 hrs ago0x1c9f9483e1f7b5e4c455ef80d1c26773a541cfe8 IN  0x44af736495544a726ed15cb0ebe2d87a6bcc18320 Ether0.00007645 2.425
0x8444ea02edc43c5be23d3aa4b17e4b561ba2d08a2cf7b9e8e24955005200a483Mint323454352022-06-24 3:17:2410 days 21 hrs ago0x1c9f9483e1f7b5e4c455ef80d1c26773a541cfe8 IN  0x44af736495544a726ed15cb0ebe2d87a6bcc18320 Ether0.0001577 5
0x43538c5a8c0425f5d4caac3131023561609744b9ceabf980bcc058b33a851dd9Mint313281232022-04-29 22:03:3666 days 2 hrs ago0x272e3e4381e17c87d09e91cf9be8a0f523fcfcdc IN  0x44af736495544a726ed15cb0ebe2d87a6bcc18320 Ether0.00023107 1
0x4825877840fccfa418b41c177fe55821f132ee9a5892890f027579b0329bac63Mint298679052022-02-16 12:23:56138 days 12 hrs ago0xa4901eab0b436b4991d35659b366b143e1d6e7bf IN  0x44af736495544a726ed15cb0ebe2d87a6bcc18320 Ether0.00057017 2.5
0xd7bdaf195b90f6c378072c9964d42a26969f15b27a890009e83297fd35656563Mint298678712022-02-16 12:21:12138 days 12 hrs ago0xa4901eab0b436b4991d35659b366b143e1d6e7bf IN  0x44af736495544a726ed15cb0ebe2d87a6bcc18320 Ether0.00007876 2.5
0x3a2e731f1138493be8bfce4f0dbd51d09207bff227451e5029b3fad2c86d7f12Mint296376232022-02-03 20:42:04151 days 4 hrs ago0x35efbd8ab6f7258c13d3ecdfc56c2c0dd094678f IN  0x44af736495544a726ed15cb0ebe2d87a6bcc18320 Ether0.0002281 1
0xd25bc844932d1676e4ad49721a76ae9fad869ee783dd3f2644d135bd116518f5Nominate New Own...292665782022-01-15 3:17:12170 days 21 hrs ago0x73570075092502472e4b61a7058df1a4a1db12f2 IN  0x44af736495544a726ed15cb0ebe2d87a6bcc18320 Ether0.00004711 1
0x1af61a819fd41e4e446e5a4978648bce937f111b8f283d383e34d7c32bc99cbfRebuild Cache253818902021-06-10 7:53:52389 days 16 hrs ago0xe30a877cb11d3f1baac590cf208d24aa8946b6f9 IN  0x44af736495544a726ed15cb0ebe2d87a6bcc18320 Ether0.000408115
0x2f6021918773fbb139f9c0cb3adfdeb5aee9c9a02e54ff0dc6d28ed07ee1dc4cAccept Ownership253818312021-06-10 7:49:56389 days 17 hrs ago0xe30a877cb11d3f1baac590cf208d24aa8946b6f9 IN  0x44af736495544a726ed15cb0ebe2d87a6bcc18320 Ether0.000118055
0x9608dc0dbfabf7a81a1ff5764879cbb4f68a96bcde9d9b2166fa595d364357bcMint253711062021-06-09 19:54:32390 days 4 hrs ago0xe30a877cb11d3f1baac590cf208d24aa8946b6f9 IN  0x44af736495544a726ed15cb0ebe2d87a6bcc18320 Ether0.000157525
0x1b1e8eb74102b8264ac3fc8d551532b94fe017cb4bed0f733925e40d135e5aceMint253710152021-06-09 19:48:28390 days 5 hrs ago0xe30a877cb11d3f1baac590cf208d24aa8946b6f9 IN  0x44af736495544a726ed15cb0ebe2d87a6bcc18320 Ether0.000063012
0xa914fc213456fb76b5b8c06b428a2c72a70e719a87d7593a120de8f5b90ff7e8Mint252964282021-06-06 7:58:56393 days 16 hrs ago0x57170b6ae91d06102ec7d984d551d590ce1504e5 IN  0x44af736495544a726ed15cb0ebe2d87a6bcc18320 Ether0.000166411
0xc3df5d9eab3dd86c463aa99f3bdcfa13e4aedda856cadfcbc7deec861eb152fdMint252963302021-06-06 7:51:56393 days 16 hrs ago0x57170b6ae91d06102ec7d984d551d590ce1504e5 IN  0x44af736495544a726ed15cb0ebe2d87a6bcc18320 Ether0.000166411
0x2edc975fd5ff5deae89e6d5625bc023083fc76c86311ce7fee32a8ae96093df4Mint252962902021-06-06 7:49:08393 days 17 hrs ago0x57170b6ae91d06102ec7d984d551d590ce1504e5 IN  0x44af736495544a726ed15cb0ebe2d87a6bcc18320 Ether0.000832095
0xf2e10a9b02f7e723a5bd23c49741eb31b3d9108dd0f8c96292c06fb1207b7217Mint252962452021-06-06 7:45:52393 days 17 hrs ago0x57170b6ae91d06102ec7d984d551d590ce1504e5 IN  0x44af736495544a726ed15cb0ebe2d87a6bcc18320 Ether0.000832095
0x35ebc4532ccd6d7e06d83df5dd9678024da17869201490c44db9be49603a4bb4Mint252962342021-06-06 7:45:08393 days 17 hrs ago0x57170b6ae91d06102ec7d984d551d590ce1504e5 IN  0x44af736495544a726ed15cb0ebe2d87a6bcc18320 Ether0.000166411
0x01665f3f7652f0932face00c49433240200c8fd284c20957b6f8c8f777f2dad8Mint252962162021-06-06 7:43:48393 days 17 hrs ago0x57170b6ae91d06102ec7d984d551d590ce1504e5 IN  0x44af736495544a726ed15cb0ebe2d87a6bcc18320 Ether0.000166411
0xd1b3950f733568a7019515933493cb0f798e209fec992f38153406c7c11b1e7dMint252962052021-06-06 7:43:00393 days 17 hrs ago0x57170b6ae91d06102ec7d984d551d590ce1504e5 IN  0x44af736495544a726ed15cb0ebe2d87a6bcc18320 Ether0.00020061
0x9c4848729ea2447cd8e6eb7c211a93bdd64fad798c2de681735fac534ebbf36dMint252466722021-06-03 21:43:44396 days 3 hrs ago0x57170b6ae91d06102ec7d984d551d590ce1504e5 IN  0x44af736495544a726ed15cb0ebe2d87a6bcc18320 Ether0.000332832
0x3bbff9c3d8da75e85a52517f09da4cbd2c540c284cec50bd597ba892a1efd068Mint252466382021-06-03 21:41:24396 days 3 hrs ago0x57170b6ae91d06102ec7d984d551d590ce1504e5 IN  0x44af736495544a726ed15cb0ebe2d87a6bcc18320 Ether0.000332832
0xd400c91890af8cf6e573cb854096f9b47acf283461d86646027f6476340d5edbMint252464592021-06-03 21:28:36396 days 3 hrs ago0x57170b6ae91d06102ec7d984d551d590ce1504e5 IN  0x44af736495544a726ed15cb0ebe2d87a6bcc18320 Ether0.000332832
0xf5333500f25ac97efa9d18b8f298ffbb7329df6e6b4ee47aa431a298d8afbda0Mint252464532021-06-03 21:28:12396 days 3 hrs ago0x57170b6ae91d06102ec7d984d551d590ce1504e5 IN  0x44af736495544a726ed15cb0ebe2d87a6bcc18320 Ether0.000332832
0xd7bec6eef832eb1be040632f0aae491b951caaca2be1625fc9a70bda85d47e19Mint252463812021-06-03 21:23:04396 days 3 hrs ago0x57170b6ae91d06102ec7d984d551d590ce1504e5 IN  0x44af736495544a726ed15cb0ebe2d87a6bcc18320 Ether0.000332832
0x729127b9efb681ffcb5d0e9e1047e04c83f730ccc988798c063d7df352d81e5eMint252463402021-06-03 21:20:20396 days 3 hrs ago0x57170b6ae91d06102ec7d984d551d590ce1504e5 IN  0x44af736495544a726ed15cb0ebe2d87a6bcc18320 Ether0.000332812
0xcdf2d38c97a01f09c353e02a3bf57860bd27b024530aea5db6fee518cdb4c92eMint248959292021-05-17 17:43:32413 days 7 hrs ago0xe51a50e95c5a92cb4650eacf6ffcb3eb25c7a012 IN  0x44af736495544a726ed15cb0ebe2d87a6bcc18320 Ether0.000062962
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Latest 25 internal transaction
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0x5efd612407465a94f0643faf2314a850fb55b4876023e510cd24dcfadfe146a6325458722022-07-04 18:28:246 hrs 22 mins ago 0x44af736495544a726ed15cb0ebe2d87a6bcc1832 0x412c870daab642aa87715e2ea860d20e48e732670 Ether
0x5efd612407465a94f0643faf2314a850fb55b4876023e510cd24dcfadfe146a6325458722022-07-04 18:28:246 hrs 22 mins ago 0xf7440b98b0dc9b54bfae68288a11c48dabfe7d07 0x44af736495544a726ed15cb0ebe2d87a6bcc18320 Ether
0x42d97d69c0eeb1d8b0e1b564c7bbd39e6e0bf333f256d127b0709b72bed2b665325397032022-07-04 10:18:2014 hrs 32 mins ago 0x44af736495544a726ed15cb0ebe2d87a6bcc1832 0x412c870daab642aa87715e2ea860d20e48e732670 Ether
0x42d97d69c0eeb1d8b0e1b564c7bbd39e6e0bf333f256d127b0709b72bed2b665325397032022-07-04 10:18:2014 hrs 32 mins ago 0xf7440b98b0dc9b54bfae68288a11c48dabfe7d07 0x44af736495544a726ed15cb0ebe2d87a6bcc18320 Ether
0x18dd50c8504d3514e348f5525bb97ea40bef3254a8672f00b542f9bb1b71bebb325335042022-07-04 2:08:2422 hrs 42 mins ago 0x44af736495544a726ed15cb0ebe2d87a6bcc1832 0x412c870daab642aa87715e2ea860d20e48e732670 Ether
0x18dd50c8504d3514e348f5525bb97ea40bef3254a8672f00b542f9bb1b71bebb325335042022-07-04 2:08:2422 hrs 42 mins ago 0xf7440b98b0dc9b54bfae68288a11c48dabfe7d07 0x44af736495544a726ed15cb0ebe2d87a6bcc18320 Ether
0xd8a72d9490c761f7f9c85147722343b6c0e2e777447c55abbd5092e3fe2cb88a325277742022-07-03 17:58:241 day 6 hrs ago 0x44af736495544a726ed15cb0ebe2d87a6bcc1832 0x412c870daab642aa87715e2ea860d20e48e732670 Ether
0xd8a72d9490c761f7f9c85147722343b6c0e2e777447c55abbd5092e3fe2cb88a325277742022-07-03 17:58:241 day 6 hrs ago 0xf7440b98b0dc9b54bfae68288a11c48dabfe7d07 0x44af736495544a726ed15cb0ebe2d87a6bcc18320 Ether
0xaf2b59447c490650b150e0f4bbad5e29621c6c9c5c6d2e1695527a2924cb3d0e325216082022-07-03 9:48:241 day 15 hrs ago 0x44af736495544a726ed15cb0ebe2d87a6bcc1832 0x412c870daab642aa87715e2ea860d20e48e732670 Ether
0xaf2b59447c490650b150e0f4bbad5e29621c6c9c5c6d2e1695527a2924cb3d0e325216082022-07-03 9:48:241 day 15 hrs ago 0xf7440b98b0dc9b54bfae68288a11c48dabfe7d07 0x44af736495544a726ed15cb0ebe2d87a6bcc18320 Ether
0x1b816902015a438c6ee6f349e9d0728fd8c09a42447a6ff143bb4811de5ab128325160092022-07-03 1:38:201 day 23 hrs ago 0x44af736495544a726ed15cb0ebe2d87a6bcc1832 0x412c870daab642aa87715e2ea860d20e48e732670 Ether
0x1b816902015a438c6ee6f349e9d0728fd8c09a42447a6ff143bb4811de5ab128325160092022-07-03 1:38:201 day 23 hrs ago 0xf7440b98b0dc9b54bfae68288a11c48dabfe7d07 0x44af736495544a726ed15cb0ebe2d87a6bcc18320 Ether
0xd6f13b6b1eecfbea7aca2fe635f065b41c4ce053cea16f4cc7d3c49d086e0a95325106452022-07-02 17:28:242 days 7 hrs ago 0x44af736495544a726ed15cb0ebe2d87a6bcc1832 0x412c870daab642aa87715e2ea860d20e48e732670 Ether
0xd6f13b6b1eecfbea7aca2fe635f065b41c4ce053cea16f4cc7d3c49d086e0a95325106452022-07-02 17:28:242 days 7 hrs ago 0xf7440b98b0dc9b54bfae68288a11c48dabfe7d07 0x44af736495544a726ed15cb0ebe2d87a6bcc18320 Ether
0x63487bde9cc504389e511716bd08f86483c51429425ba365a3762ea06b7ea898325043642022-07-02 9:18:322 days 15 hrs ago 0x44af736495544a726ed15cb0ebe2d87a6bcc1832 0x412c870daab642aa87715e2ea860d20e48e732670 Ether
0x63487bde9cc504389e511716bd08f86483c51429425ba365a3762ea06b7ea898325043642022-07-02 9:18:322 days 15 hrs ago 0xf7440b98b0dc9b54bfae68288a11c48dabfe7d07 0x44af736495544a726ed15cb0ebe2d87a6bcc18320 Ether
0x1b13e155e2228ff87ee4397770adcd6225a9c08b4a72f318502376d7d0aac2bf324987242022-07-02 1:08:242 days 23 hrs ago 0x44af736495544a726ed15cb0ebe2d87a6bcc1832 0x412c870daab642aa87715e2ea860d20e48e732670 Ether
0x1b13e155e2228ff87ee4397770adcd6225a9c08b4a72f318502376d7d0aac2bf324987242022-07-02 1:08:242 days 23 hrs ago 0xf7440b98b0dc9b54bfae68288a11c48dabfe7d07 0x44af736495544a726ed15cb0ebe2d87a6bcc18320 Ether
0x95caf6222e91f9399402b9778e54d25f3efc37d1a9c023feb314095c8d67edb9324924842022-07-01 16:58:243 days 7 hrs ago 0x44af736495544a726ed15cb0ebe2d87a6bcc1832 0x412c870daab642aa87715e2ea860d20e48e732670 Ether
0x95caf6222e91f9399402b9778e54d25f3efc37d1a9c023feb314095c8d67edb9324924842022-07-01 16:58:243 days 7 hrs ago 0xf7440b98b0dc9b54bfae68288a11c48dabfe7d07 0x44af736495544a726ed15cb0ebe2d87a6bcc18320 Ether
0x166b7417a524d16e867ae6377ad23fd7c9abf13d760688dcf75401e91451beea324861692022-07-01 8:48:243 days 16 hrs ago 0x44af736495544a726ed15cb0ebe2d87a6bcc1832 0x412c870daab642aa87715e2ea860d20e48e732670 Ether
0x166b7417a524d16e867ae6377ad23fd7c9abf13d760688dcf75401e91451beea324861692022-07-01 8:48:243 days 16 hrs ago 0xf7440b98b0dc9b54bfae68288a11c48dabfe7d07 0x44af736495544a726ed15cb0ebe2d87a6bcc18320 Ether
0xc97e4c027319f333fc2e645cd9785861cd0c5fae24f1b1c2a98940b20f52a4b0324802462022-07-01 0:38:204 days 12 mins ago 0x44af736495544a726ed15cb0ebe2d87a6bcc1832 0x412c870daab642aa87715e2ea860d20e48e732670 Ether
0xc97e4c027319f333fc2e645cd9785861cd0c5fae24f1b1c2a98940b20f52a4b0324802462022-07-01 0:38:204 days 12 mins ago 0xf7440b98b0dc9b54bfae68288a11c48dabfe7d07 0x44af736495544a726ed15cb0ebe2d87a6bcc18320 Ether
0x3972a728b70ca2dbd8155379e99026b086c642b66ccf7815ef7a8c156f63d5a0324744502022-06-30 16:28:244 days 8 hrs ago 0x44af736495544a726ed15cb0ebe2d87a6bcc1832 0x412c870daab642aa87715e2ea860d20e48e732670 Ether
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Contract Source Code Verified (Exact Match)

Contract Name:
EtherWrapper

Compiler Version
v0.5.16+commit.9c3226ce

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion

Contract Source Code (Solidity)

/**
 *Submitted for verification at Etherscan.io on 2021-05-13
*/

/*
   ____            __   __        __   _
  / __/__ __ ___  / /_ / /  ___  / /_ (_)__ __
 _\ \ / // // _ \/ __// _ \/ -_)/ __// / \ \ /
/___/ \_, //_//_/\__//_//_/\__/ \__//_/ /_\_\
     /___/

* Synthetix: EtherWrapper.sol
*
* Latest source (may be newer): https://github.com/Synthetixio/synthetix/blob/master/contracts/EtherWrapper.sol
* Docs: https://docs.synthetix.io/contracts/EtherWrapper
*
* Contract Dependencies: 
*	- IAddressResolver
*	- IEtherWrapper
*	- MixinResolver
*	- MixinSystemSettings
*	- Owned
*	- Pausable
* Libraries: 
*	- SafeDecimalMath
*	- SafeMath
*
* MIT License
* ===========
*
* Copyright (c) 2021 Synthetix
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
*/



pragma solidity ^0.5.16;

// https://docs.synthetix.io/contracts/source/contracts/owned
contract Owned {
    address public owner;
    address public nominatedOwner;

    constructor(address _owner) public {
        require(_owner != address(0), "Owner address cannot be 0");
        owner = _owner;
        emit OwnerChanged(address(0), _owner);
    }

    function nominateNewOwner(address _owner) external onlyOwner {
        nominatedOwner = _owner;
        emit OwnerNominated(_owner);
    }

    function acceptOwnership() external {
        require(msg.sender == nominatedOwner, "You must be nominated before you can accept ownership");
        emit OwnerChanged(owner, nominatedOwner);
        owner = nominatedOwner;
        nominatedOwner = address(0);
    }

    modifier onlyOwner {
        _onlyOwner();
        _;
    }

    function _onlyOwner() private view {
        require(msg.sender == owner, "Only the contract owner may perform this action");
    }

    event OwnerNominated(address newOwner);
    event OwnerChanged(address oldOwner, address newOwner);
}


// https://docs.synthetix.io/contracts/source/interfaces/iaddressresolver
interface IAddressResolver {
    function getAddress(bytes32 name) external view returns (address);

    function getSynth(bytes32 key) external view returns (address);

    function requireAndGetAddress(bytes32 name, string calldata reason) external view returns (address);
}


interface IWETH {
    // ERC20 Optional Views
    function name() external view returns (string memory);

    function symbol() external view returns (string memory);

    function decimals() external view returns (uint8);

    // Views
    function totalSupply() external view returns (uint);

    function balanceOf(address owner) external view returns (uint);

    function allowance(address owner, address spender) external view returns (uint);

    // Mutative functions
    function transfer(address to, uint value) external returns (bool);

    function approve(address spender, uint value) external returns (bool);

    function transferFrom(
        address from,
        address to,
        uint value
    ) external returns (bool);

    // WETH-specific functions.
    function deposit() external payable;

    function withdraw(uint amount) external;

    // Events
    event Transfer(address indexed from, address indexed to, uint value);
    event Approval(address indexed owner, address indexed spender, uint value);
    event Deposit(address indexed to, uint amount);
    event Withdrawal(address indexed to, uint amount);
}


// https://docs.synthetix.io/contracts/source/interfaces/ietherwrapper
contract IEtherWrapper {
    function mint(uint amount) external;

    function burn(uint amount) external;

    function distributeFees() external;

    function capacity() external view returns (uint);

    function getReserves() external view returns (uint);

    function totalIssuedSynths() external view returns (uint);

    function calculateMintFee(uint amount) public view returns (uint);

    function calculateBurnFee(uint amount) public view returns (uint);

    function maxETH() public view returns (uint256);

    function mintFeeRate() public view returns (uint256);

    function burnFeeRate() public view returns (uint256);

    function weth() public view returns (IWETH);
}


// https://docs.synthetix.io/contracts/source/interfaces/isynth
interface ISynth {
    // Views
    function currencyKey() external view returns (bytes32);

    function transferableSynths(address account) external view returns (uint);

    // Mutative functions
    function transferAndSettle(address to, uint value) external returns (bool);

    function transferFromAndSettle(
        address from,
        address to,
        uint value
    ) external returns (bool);

    // Restricted: used internally to Synthetix
    function burn(address account, uint amount) external;

    function issue(address account, uint amount) external;
}


// https://docs.synthetix.io/contracts/source/interfaces/ierc20
interface IERC20 {
    // ERC20 Optional Views
    function name() external view returns (string memory);

    function symbol() external view returns (string memory);

    function decimals() external view returns (uint8);

    // Views
    function totalSupply() external view returns (uint);

    function balanceOf(address owner) external view returns (uint);

    function allowance(address owner, address spender) external view returns (uint);

    // Mutative functions
    function transfer(address to, uint value) external returns (bool);

    function approve(address spender, uint value) external returns (bool);

    function transferFrom(
        address from,
        address to,
        uint value
    ) external returns (bool);

    // Events
    event Transfer(address indexed from, address indexed to, uint value);

    event Approval(address indexed owner, address indexed spender, uint value);
}


// Inheritance


// https://docs.synthetix.io/contracts/source/contracts/pausable
contract Pausable is Owned {
    uint public lastPauseTime;
    bool public paused;

    constructor() internal {
        // This contract is abstract, and thus cannot be instantiated directly
        require(owner != address(0), "Owner must be set");
        // Paused will be false, and lastPauseTime will be 0 upon initialisation
    }

    /**
     * @notice Change the paused state of the contract
     * @dev Only the contract owner may call this.
     */
    function setPaused(bool _paused) external onlyOwner {
        // Ensure we're actually changing the state before we do anything
        if (_paused == paused) {
            return;
        }

        // Set our paused state.
        paused = _paused;

        // If applicable, set the last pause time.
        if (paused) {
            lastPauseTime = now;
        }

        // Let everyone know that our pause state has changed.
        emit PauseChanged(paused);
    }

    event PauseChanged(bool isPaused);

    modifier notPaused {
        require(!paused, "This action cannot be performed while the contract is paused");
        _;
    }
}


// https://docs.synthetix.io/contracts/source/interfaces/iissuer
interface IIssuer {
    // Views
    function anySynthOrSNXRateIsInvalid() external view returns (bool anyRateInvalid);

    function availableCurrencyKeys() external view returns (bytes32[] memory);

    function availableSynthCount() external view returns (uint);

    function availableSynths(uint index) external view returns (ISynth);

    function canBurnSynths(address account) external view returns (bool);

    function collateral(address account) external view returns (uint);

    function collateralisationRatio(address issuer) external view returns (uint);

    function collateralisationRatioAndAnyRatesInvalid(address _issuer)
        external
        view
        returns (uint cratio, bool anyRateIsInvalid);

    function debtBalanceOf(address issuer, bytes32 currencyKey) external view returns (uint debtBalance);

    function issuanceRatio() external view returns (uint);

    function lastIssueEvent(address account) external view returns (uint);

    function maxIssuableSynths(address issuer) external view returns (uint maxIssuable);

    function minimumStakeTime() external view returns (uint);

    function remainingIssuableSynths(address issuer)
        external
        view
        returns (
            uint maxIssuable,
            uint alreadyIssued,
            uint totalSystemDebt
        );

    function synths(bytes32 currencyKey) external view returns (ISynth);

    function getSynths(bytes32[] calldata currencyKeys) external view returns (ISynth[] memory);

    function synthsByAddress(address synthAddress) external view returns (bytes32);

    function totalIssuedSynths(bytes32 currencyKey, bool excludeEtherCollateral) external view returns (uint);

    function transferableSynthetixAndAnyRateIsInvalid(address account, uint balance)
        external
        view
        returns (uint transferable, bool anyRateIsInvalid);

    // Restricted: used internally to Synthetix
    function issueSynths(address from, uint amount) external;

    function issueSynthsOnBehalf(
        address issueFor,
        address from,
        uint amount
    ) external;

    function issueMaxSynths(address from) external;

    function issueMaxSynthsOnBehalf(address issueFor, address from) external;

    function burnSynths(address from, uint amount) external;

    function burnSynthsOnBehalf(
        address burnForAddress,
        address from,
        uint amount
    ) external;

    function burnSynthsToTarget(address from) external;

    function burnSynthsToTargetOnBehalf(address burnForAddress, address from) external;

    function liquidateDelinquentAccount(
        address account,
        uint susdAmount,
        address liquidator
    ) external returns (uint totalRedeemed, uint amountToLiquidate);
}


// https://docs.synthetix.io/contracts/source/interfaces/iexchangerates
interface IExchangeRates {
    // Structs
    struct RateAndUpdatedTime {
        uint216 rate;
        uint40 time;
    }

    struct InversePricing {
        uint entryPoint;
        uint upperLimit;
        uint lowerLimit;
        bool frozenAtUpperLimit;
        bool frozenAtLowerLimit;
    }

    // Views
    function aggregators(bytes32 currencyKey) external view returns (address);

    function aggregatorWarningFlags() external view returns (address);

    function anyRateIsInvalid(bytes32[] calldata currencyKeys) external view returns (bool);

    function canFreezeRate(bytes32 currencyKey) external view returns (bool);

    function currentRoundForRate(bytes32 currencyKey) external view returns (uint);

    function currenciesUsingAggregator(address aggregator) external view returns (bytes32[] memory);

    function effectiveValue(
        bytes32 sourceCurrencyKey,
        uint sourceAmount,
        bytes32 destinationCurrencyKey
    ) external view returns (uint value);

    function effectiveValueAndRates(
        bytes32 sourceCurrencyKey,
        uint sourceAmount,
        bytes32 destinationCurrencyKey
    )
        external
        view
        returns (
            uint value,
            uint sourceRate,
            uint destinationRate
        );

    function effectiveValueAtRound(
        bytes32 sourceCurrencyKey,
        uint sourceAmount,
        bytes32 destinationCurrencyKey,
        uint roundIdForSrc,
        uint roundIdForDest
    ) external view returns (uint value);

    function getCurrentRoundId(bytes32 currencyKey) external view returns (uint);

    function getLastRoundIdBeforeElapsedSecs(
        bytes32 currencyKey,
        uint startingRoundId,
        uint startingTimestamp,
        uint timediff
    ) external view returns (uint);

    function inversePricing(bytes32 currencyKey)
        external
        view
        returns (
            uint entryPoint,
            uint upperLimit,
            uint lowerLimit,
            bool frozenAtUpperLimit,
            bool frozenAtLowerLimit
        );

    function lastRateUpdateTimes(bytes32 currencyKey) external view returns (uint256);

    function oracle() external view returns (address);

    function rateAndTimestampAtRound(bytes32 currencyKey, uint roundId) external view returns (uint rate, uint time);

    function rateAndUpdatedTime(bytes32 currencyKey) external view returns (uint rate, uint time);

    function rateAndInvalid(bytes32 currencyKey) external view returns (uint rate, bool isInvalid);

    function rateForCurrency(bytes32 currencyKey) external view returns (uint);

    function rateIsFlagged(bytes32 currencyKey) external view returns (bool);

    function rateIsFrozen(bytes32 currencyKey) external view returns (bool);

    function rateIsInvalid(bytes32 currencyKey) external view returns (bool);

    function rateIsStale(bytes32 currencyKey) external view returns (bool);

    function rateStalePeriod() external view returns (uint);

    function ratesAndUpdatedTimeForCurrencyLastNRounds(bytes32 currencyKey, uint numRounds)
        external
        view
        returns (uint[] memory rates, uint[] memory times);

    function ratesAndInvalidForCurrencies(bytes32[] calldata currencyKeys)
        external
        view
        returns (uint[] memory rates, bool anyRateInvalid);

    function ratesForCurrencies(bytes32[] calldata currencyKeys) external view returns (uint[] memory);

    // Mutative functions
    function freezeRate(bytes32 currencyKey) external;
}


// https://docs.synthetix.io/contracts/source/interfaces/ifeepool
interface IFeePool {
    // Views

    // solhint-disable-next-line func-name-mixedcase
    function FEE_ADDRESS() external view returns (address);

    function feesAvailable(address account) external view returns (uint, uint);

    function feePeriodDuration() external view returns (uint);

    function isFeesClaimable(address account) external view returns (bool);

    function targetThreshold() external view returns (uint);

    function totalFeesAvailable() external view returns (uint);

    function totalRewardsAvailable() external view returns (uint);

    // Mutative Functions
    function claimFees() external returns (bool);

    function claimOnBehalf(address claimingForAddress) external returns (bool);

    function closeCurrentFeePeriod() external;

    // Restricted: used internally to Synthetix
    function appendAccountIssuanceRecord(
        address account,
        uint lockedAmount,
        uint debtEntryIndex
    ) external;

    function recordFeePaid(uint sUSDAmount) external;

    function setRewardsToDistribute(uint amount) external;
}


// Inheritance


// Internal references


// https://docs.synthetix.io/contracts/source/contracts/addressresolver
contract AddressResolver is Owned, IAddressResolver {
    mapping(bytes32 => address) public repository;

    constructor(address _owner) public Owned(_owner) {}

    /* ========== RESTRICTED FUNCTIONS ========== */

    function importAddresses(bytes32[] calldata names, address[] calldata destinations) external onlyOwner {
        require(names.length == destinations.length, "Input lengths must match");

        for (uint i = 0; i < names.length; i++) {
            bytes32 name = names[i];
            address destination = destinations[i];
            repository[name] = destination;
            emit AddressImported(name, destination);
        }
    }

    /* ========= PUBLIC FUNCTIONS ========== */

    function rebuildCaches(MixinResolver[] calldata destinations) external {
        for (uint i = 0; i < destinations.length; i++) {
            destinations[i].rebuildCache();
        }
    }

    /* ========== VIEWS ========== */

    function areAddressesImported(bytes32[] calldata names, address[] calldata destinations) external view returns (bool) {
        for (uint i = 0; i < names.length; i++) {
            if (repository[names[i]] != destinations[i]) {
                return false;
            }
        }
        return true;
    }

    function getAddress(bytes32 name) external view returns (address) {
        return repository[name];
    }

    function requireAndGetAddress(bytes32 name, string calldata reason) external view returns (address) {
        address _foundAddress = repository[name];
        require(_foundAddress != address(0), reason);
        return _foundAddress;
    }

    function getSynth(bytes32 key) external view returns (address) {
        IIssuer issuer = IIssuer(repository["Issuer"]);
        require(address(issuer) != address(0), "Cannot find Issuer address");
        return address(issuer.synths(key));
    }

    /* ========== EVENTS ========== */

    event AddressImported(bytes32 name, address destination);
}


// solhint-disable payable-fallback

// https://docs.synthetix.io/contracts/source/contracts/readproxy
contract ReadProxy is Owned {
    address public target;

    constructor(address _owner) public Owned(_owner) {}

    function setTarget(address _target) external onlyOwner {
        target = _target;
        emit TargetUpdated(target);
    }

    function() external {
        // The basics of a proxy read call
        // Note that msg.sender in the underlying will always be the address of this contract.
        assembly {
            calldatacopy(0, 0, calldatasize)

            // Use of staticcall - this will revert if the underlying function mutates state
            let result := staticcall(gas, sload(target_slot), 0, calldatasize, 0, 0)
            returndatacopy(0, 0, returndatasize)

            if iszero(result) {
                revert(0, returndatasize)
            }
            return(0, returndatasize)
        }
    }

    event TargetUpdated(address newTarget);
}


// Inheritance


// Internal references


// https://docs.synthetix.io/contracts/source/contracts/mixinresolver
contract MixinResolver {
    AddressResolver public resolver;

    mapping(bytes32 => address) private addressCache;

    constructor(address _resolver) internal {
        resolver = AddressResolver(_resolver);
    }

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

    function combineArrays(bytes32[] memory first, bytes32[] memory second)
        internal
        pure
        returns (bytes32[] memory combination)
    {
        combination = new bytes32[](first.length + second.length);

        for (uint i = 0; i < first.length; i++) {
            combination[i] = first[i];
        }

        for (uint j = 0; j < second.length; j++) {
            combination[first.length + j] = second[j];
        }
    }

    /* ========== PUBLIC FUNCTIONS ========== */

    // Note: this function is public not external in order for it to be overridden and invoked via super in subclasses
    function resolverAddressesRequired() public view returns (bytes32[] memory addresses) {}

    function rebuildCache() public {
        bytes32[] memory requiredAddresses = resolverAddressesRequired();
        // The resolver must call this function whenver it updates its state
        for (uint i = 0; i < requiredAddresses.length; i++) {
            bytes32 name = requiredAddresses[i];
            // Note: can only be invoked once the resolver has all the targets needed added
            address destination =
                resolver.requireAndGetAddress(name, string(abi.encodePacked("Resolver missing target: ", name)));
            addressCache[name] = destination;
            emit CacheUpdated(name, destination);
        }
    }

    /* ========== VIEWS ========== */

    function isResolverCached() external view returns (bool) {
        bytes32[] memory requiredAddresses = resolverAddressesRequired();
        for (uint i = 0; i < requiredAddresses.length; i++) {
            bytes32 name = requiredAddresses[i];
            // false if our cache is invalid or if the resolver doesn't have the required address
            if (resolver.getAddress(name) != addressCache[name] || addressCache[name] == address(0)) {
                return false;
            }
        }

        return true;
    }

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

    function requireAndGetAddress(bytes32 name) internal view returns (address) {
        address _foundAddress = addressCache[name];
        require(_foundAddress != address(0), string(abi.encodePacked("Missing address: ", name)));
        return _foundAddress;
    }

    /* ========== EVENTS ========== */

    event CacheUpdated(bytes32 name, address destination);
}


// https://docs.synthetix.io/contracts/source/interfaces/iflexiblestorage
interface IFlexibleStorage {
    // Views
    function getUIntValue(bytes32 contractName, bytes32 record) external view returns (uint);

    function getUIntValues(bytes32 contractName, bytes32[] calldata records) external view returns (uint[] memory);

    function getIntValue(bytes32 contractName, bytes32 record) external view returns (int);

    function getIntValues(bytes32 contractName, bytes32[] calldata records) external view returns (int[] memory);

    function getAddressValue(bytes32 contractName, bytes32 record) external view returns (address);

    function getAddressValues(bytes32 contractName, bytes32[] calldata records) external view returns (address[] memory);

    function getBoolValue(bytes32 contractName, bytes32 record) external view returns (bool);

    function getBoolValues(bytes32 contractName, bytes32[] calldata records) external view returns (bool[] memory);

    function getBytes32Value(bytes32 contractName, bytes32 record) external view returns (bytes32);

    function getBytes32Values(bytes32 contractName, bytes32[] calldata records) external view returns (bytes32[] memory);

    // Mutative functions
    function deleteUIntValue(bytes32 contractName, bytes32 record) external;

    function deleteIntValue(bytes32 contractName, bytes32 record) external;

    function deleteAddressValue(bytes32 contractName, bytes32 record) external;

    function deleteBoolValue(bytes32 contractName, bytes32 record) external;

    function deleteBytes32Value(bytes32 contractName, bytes32 record) external;

    function setUIntValue(
        bytes32 contractName,
        bytes32 record,
        uint value
    ) external;

    function setUIntValues(
        bytes32 contractName,
        bytes32[] calldata records,
        uint[] calldata values
    ) external;

    function setIntValue(
        bytes32 contractName,
        bytes32 record,
        int value
    ) external;

    function setIntValues(
        bytes32 contractName,
        bytes32[] calldata records,
        int[] calldata values
    ) external;

    function setAddressValue(
        bytes32 contractName,
        bytes32 record,
        address value
    ) external;

    function setAddressValues(
        bytes32 contractName,
        bytes32[] calldata records,
        address[] calldata values
    ) external;

    function setBoolValue(
        bytes32 contractName,
        bytes32 record,
        bool value
    ) external;

    function setBoolValues(
        bytes32 contractName,
        bytes32[] calldata records,
        bool[] calldata values
    ) external;

    function setBytes32Value(
        bytes32 contractName,
        bytes32 record,
        bytes32 value
    ) external;

    function setBytes32Values(
        bytes32 contractName,
        bytes32[] calldata records,
        bytes32[] calldata values
    ) external;
}


// Internal references


// https://docs.synthetix.io/contracts/source/contracts/mixinsystemsettings
contract MixinSystemSettings is MixinResolver {
    bytes32 internal constant SETTING_CONTRACT_NAME = "SystemSettings";

    bytes32 internal constant SETTING_WAITING_PERIOD_SECS = "waitingPeriodSecs";
    bytes32 internal constant SETTING_PRICE_DEVIATION_THRESHOLD_FACTOR = "priceDeviationThresholdFactor";
    bytes32 internal constant SETTING_ISSUANCE_RATIO = "issuanceRatio";
    bytes32 internal constant SETTING_FEE_PERIOD_DURATION = "feePeriodDuration";
    bytes32 internal constant SETTING_TARGET_THRESHOLD = "targetThreshold";
    bytes32 internal constant SETTING_LIQUIDATION_DELAY = "liquidationDelay";
    bytes32 internal constant SETTING_LIQUIDATION_RATIO = "liquidationRatio";
    bytes32 internal constant SETTING_LIQUIDATION_PENALTY = "liquidationPenalty";
    bytes32 internal constant SETTING_RATE_STALE_PERIOD = "rateStalePeriod";
    bytes32 internal constant SETTING_EXCHANGE_FEE_RATE = "exchangeFeeRate";
    bytes32 internal constant SETTING_MINIMUM_STAKE_TIME = "minimumStakeTime";
    bytes32 internal constant SETTING_AGGREGATOR_WARNING_FLAGS = "aggregatorWarningFlags";
    bytes32 internal constant SETTING_TRADING_REWARDS_ENABLED = "tradingRewardsEnabled";
    bytes32 internal constant SETTING_DEBT_SNAPSHOT_STALE_TIME = "debtSnapshotStaleTime";
    bytes32 internal constant SETTING_CROSS_DOMAIN_DEPOSIT_GAS_LIMIT = "crossDomainDepositGasLimit";
    bytes32 internal constant SETTING_CROSS_DOMAIN_ESCROW_GAS_LIMIT = "crossDomainEscrowGasLimit";
    bytes32 internal constant SETTING_CROSS_DOMAIN_REWARD_GAS_LIMIT = "crossDomainRewardGasLimit";
    bytes32 internal constant SETTING_CROSS_DOMAIN_WITHDRAWAL_GAS_LIMIT = "crossDomainWithdrawalGasLimit";
    bytes32 internal constant SETTING_ETHER_WRAPPER_MAX_ETH = "etherWrapperMaxETH";
    bytes32 internal constant SETTING_ETHER_WRAPPER_MINT_FEE_RATE = "etherWrapperMintFeeRate";
    bytes32 internal constant SETTING_ETHER_WRAPPER_BURN_FEE_RATE = "etherWrapperBurnFeeRate";

    bytes32 internal constant CONTRACT_FLEXIBLESTORAGE = "FlexibleStorage";

    enum CrossDomainMessageGasLimits {Deposit, Escrow, Reward, Withdrawal}

    constructor(address _resolver) internal MixinResolver(_resolver) {}

    function resolverAddressesRequired() public view returns (bytes32[] memory addresses) {
        addresses = new bytes32[](1);
        addresses[0] = CONTRACT_FLEXIBLESTORAGE;
    }

    function flexibleStorage() internal view returns (IFlexibleStorage) {
        return IFlexibleStorage(requireAndGetAddress(CONTRACT_FLEXIBLESTORAGE));
    }

    function _getGasLimitSetting(CrossDomainMessageGasLimits gasLimitType) internal pure returns (bytes32) {
        if (gasLimitType == CrossDomainMessageGasLimits.Deposit) {
            return SETTING_CROSS_DOMAIN_DEPOSIT_GAS_LIMIT;
        } else if (gasLimitType == CrossDomainMessageGasLimits.Escrow) {
            return SETTING_CROSS_DOMAIN_ESCROW_GAS_LIMIT;
        } else if (gasLimitType == CrossDomainMessageGasLimits.Reward) {
            return SETTING_CROSS_DOMAIN_REWARD_GAS_LIMIT;
        } else if (gasLimitType == CrossDomainMessageGasLimits.Withdrawal) {
            return SETTING_CROSS_DOMAIN_WITHDRAWAL_GAS_LIMIT;
        } else {
            revert("Unknown gas limit type");
        }
    }

    function getCrossDomainMessageGasLimit(CrossDomainMessageGasLimits gasLimitType) internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, _getGasLimitSetting(gasLimitType));
    }

    function getTradingRewardsEnabled() internal view returns (bool) {
        return flexibleStorage().getBoolValue(SETTING_CONTRACT_NAME, SETTING_TRADING_REWARDS_ENABLED);
    }

    function getWaitingPeriodSecs() internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_WAITING_PERIOD_SECS);
    }

    function getPriceDeviationThresholdFactor() internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_PRICE_DEVIATION_THRESHOLD_FACTOR);
    }

    function getIssuanceRatio() internal view returns (uint) {
        // lookup on flexible storage directly for gas savings (rather than via SystemSettings)
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_ISSUANCE_RATIO);
    }

    function getFeePeriodDuration() internal view returns (uint) {
        // lookup on flexible storage directly for gas savings (rather than via SystemSettings)
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_FEE_PERIOD_DURATION);
    }

    function getTargetThreshold() internal view returns (uint) {
        // lookup on flexible storage directly for gas savings (rather than via SystemSettings)
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_TARGET_THRESHOLD);
    }

    function getLiquidationDelay() internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_LIQUIDATION_DELAY);
    }

    function getLiquidationRatio() internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_LIQUIDATION_RATIO);
    }

    function getLiquidationPenalty() internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_LIQUIDATION_PENALTY);
    }

    function getRateStalePeriod() internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_RATE_STALE_PERIOD);
    }

    function getExchangeFeeRate(bytes32 currencyKey) internal view returns (uint) {
        return
            flexibleStorage().getUIntValue(
                SETTING_CONTRACT_NAME,
                keccak256(abi.encodePacked(SETTING_EXCHANGE_FEE_RATE, currencyKey))
            );
    }

    function getMinimumStakeTime() internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_MINIMUM_STAKE_TIME);
    }

    function getAggregatorWarningFlags() internal view returns (address) {
        return flexibleStorage().getAddressValue(SETTING_CONTRACT_NAME, SETTING_AGGREGATOR_WARNING_FLAGS);
    }

    function getDebtSnapshotStaleTime() internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_DEBT_SNAPSHOT_STALE_TIME);
    }

    function getEtherWrapperMaxETH() internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_ETHER_WRAPPER_MAX_ETH);
    }

    function getEtherWrapperMintFeeRate() internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_ETHER_WRAPPER_MINT_FEE_RATE);
    }

    function getEtherWrapperBurnFeeRate() internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_ETHER_WRAPPER_BURN_FEE_RATE);
    }
}


/**
 * @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) {
        require(b <= a, "SafeMath: subtraction overflow");
        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-solidity/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) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, "SafeMath: division by zero");
        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) {
        require(b != 0, "SafeMath: modulo by zero");
        return a % b;
    }
}


// Libraries


// https://docs.synthetix.io/contracts/source/libraries/safedecimalmath
library SafeDecimalMath {
    using SafeMath for uint;

    /* Number of decimal places in the representations. */
    uint8 public constant decimals = 18;
    uint8 public constant highPrecisionDecimals = 27;

    /* The number representing 1.0. */
    uint public constant UNIT = 10**uint(decimals);

    /* The number representing 1.0 for higher fidelity numbers. */
    uint public constant PRECISE_UNIT = 10**uint(highPrecisionDecimals);
    uint private constant UNIT_TO_HIGH_PRECISION_CONVERSION_FACTOR = 10**uint(highPrecisionDecimals - decimals);

    /**
     * @return Provides an interface to UNIT.
     */
    function unit() external pure returns (uint) {
        return UNIT;
    }

    /**
     * @return Provides an interface to PRECISE_UNIT.
     */
    function preciseUnit() external pure returns (uint) {
        return PRECISE_UNIT;
    }

    /**
     * @return The result of multiplying x and y, interpreting the operands as fixed-point
     * decimals.
     *
     * @dev A unit factor is divided out after the product of x and y is evaluated,
     * so that product must be less than 2**256. As this is an integer division,
     * the internal division always rounds down. This helps save on gas. Rounding
     * is more expensive on gas.
     */
    function multiplyDecimal(uint x, uint y) internal pure returns (uint) {
        /* Divide by UNIT to remove the extra factor introduced by the product. */
        return x.mul(y) / UNIT;
    }

    /**
     * @return The result of safely multiplying x and y, interpreting the operands
     * as fixed-point decimals of the specified precision unit.
     *
     * @dev The operands should be in the form of a the specified unit factor which will be
     * divided out after the product of x and y is evaluated, so that product must be
     * less than 2**256.
     *
     * Unlike multiplyDecimal, this function rounds the result to the nearest increment.
     * Rounding is useful when you need to retain fidelity for small decimal numbers
     * (eg. small fractions or percentages).
     */
    function _multiplyDecimalRound(
        uint x,
        uint y,
        uint precisionUnit
    ) private pure returns (uint) {
        /* Divide by UNIT to remove the extra factor introduced by the product. */
        uint quotientTimesTen = x.mul(y) / (precisionUnit / 10);

        if (quotientTimesTen % 10 >= 5) {
            quotientTimesTen += 10;
        }

        return quotientTimesTen / 10;
    }

    /**
     * @return The result of safely multiplying x and y, interpreting the operands
     * as fixed-point decimals of a precise unit.
     *
     * @dev The operands should be in the precise unit factor which will be
     * divided out after the product of x and y is evaluated, so that product must be
     * less than 2**256.
     *
     * Unlike multiplyDecimal, this function rounds the result to the nearest increment.
     * Rounding is useful when you need to retain fidelity for small decimal numbers
     * (eg. small fractions or percentages).
     */
    function multiplyDecimalRoundPrecise(uint x, uint y) internal pure returns (uint) {
        return _multiplyDecimalRound(x, y, PRECISE_UNIT);
    }

    /**
     * @return The result of safely multiplying x and y, interpreting the operands
     * as fixed-point decimals of a standard unit.
     *
     * @dev The operands should be in the standard unit factor which will be
     * divided out after the product of x and y is evaluated, so that product must be
     * less than 2**256.
     *
     * Unlike multiplyDecimal, this function rounds the result to the nearest increment.
     * Rounding is useful when you need to retain fidelity for small decimal numbers
     * (eg. small fractions or percentages).
     */
    function multiplyDecimalRound(uint x, uint y) internal pure returns (uint) {
        return _multiplyDecimalRound(x, y, UNIT);
    }

    /**
     * @return The result of safely dividing x and y. The return value is a high
     * precision decimal.
     *
     * @dev y is divided after the product of x and the standard precision unit
     * is evaluated, so the product of x and UNIT must be less than 2**256. As
     * this is an integer division, the result is always rounded down.
     * This helps save on gas. Rounding is more expensive on gas.
     */
    function divideDecimal(uint x, uint y) internal pure returns (uint) {
        /* Reintroduce the UNIT factor that will be divided out by y. */
        return x.mul(UNIT).div(y);
    }

    /**
     * @return The result of safely dividing x and y. The return value is as a rounded
     * decimal in the precision unit specified in the parameter.
     *
     * @dev y is divided after the product of x and the specified precision unit
     * is evaluated, so the product of x and the specified precision unit must
     * be less than 2**256. The result is rounded to the nearest increment.
     */
    function _divideDecimalRound(
        uint x,
        uint y,
        uint precisionUnit
    ) private pure returns (uint) {
        uint resultTimesTen = x.mul(precisionUnit * 10).div(y);

        if (resultTimesTen % 10 >= 5) {
            resultTimesTen += 10;
        }

        return resultTimesTen / 10;
    }

    /**
     * @return The result of safely dividing x and y. The return value is as a rounded
     * standard precision decimal.
     *
     * @dev y is divided after the product of x and the standard precision unit
     * is evaluated, so the product of x and the standard precision unit must
     * be less than 2**256. The result is rounded to the nearest increment.
     */
    function divideDecimalRound(uint x, uint y) internal pure returns (uint) {
        return _divideDecimalRound(x, y, UNIT);
    }

    /**
     * @return The result of safely dividing x and y. The return value is as a rounded
     * high precision decimal.
     *
     * @dev y is divided after the product of x and the high precision unit
     * is evaluated, so the product of x and the high precision unit must
     * be less than 2**256. The result is rounded to the nearest increment.
     */
    function divideDecimalRoundPrecise(uint x, uint y) internal pure returns (uint) {
        return _divideDecimalRound(x, y, PRECISE_UNIT);
    }

    /**
     * @dev Convert a standard decimal representation to a high precision one.
     */
    function decimalToPreciseDecimal(uint i) internal pure returns (uint) {
        return i.mul(UNIT_TO_HIGH_PRECISION_CONVERSION_FACTOR);
    }

    /**
     * @dev Convert a high precision decimal to a standard decimal representation.
     */
    function preciseDecimalToDecimal(uint i) internal pure returns (uint) {
        uint quotientTimesTen = i / (UNIT_TO_HIGH_PRECISION_CONVERSION_FACTOR / 10);

        if (quotientTimesTen % 10 >= 5) {
            quotientTimesTen += 10;
        }

        return quotientTimesTen / 10;
    }

    // Computes `a - b`, setting the value to 0 if b > a.
    function floorsub(uint a, uint b) internal pure returns (uint) {
        return b >= a ? 0 : a - b;
    }
}


// Inheritance


// Internal references


// Libraries


// https://docs.synthetix.io/contracts/source/contracts/etherwrapper
contract EtherWrapper is Owned, Pausable, MixinResolver, MixinSystemSettings, IEtherWrapper {
    using SafeMath for uint;
    using SafeDecimalMath for uint;

    /* ========== CONSTANTS ============== */

    /* ========== ENCODED NAMES ========== */

    bytes32 internal constant sUSD = "sUSD";
    bytes32 internal constant sETH = "sETH";
    bytes32 internal constant ETH = "ETH";
    bytes32 internal constant SNX = "SNX";

    /* ========== ADDRESS RESOLVER CONFIGURATION ========== */
    bytes32 private constant CONTRACT_SYNTHSETH = "SynthsETH";
    bytes32 private constant CONTRACT_SYNTHSUSD = "SynthsUSD";
    bytes32 private constant CONTRACT_ISSUER = "Issuer";
    bytes32 private constant CONTRACT_EXRATES = "ExchangeRates";
    bytes32 private constant CONTRACT_FEEPOOL = "FeePool";

    // ========== STATE VARIABLES ==========
    IWETH internal _weth;

    uint public sETHIssued = 0;
    uint public sUSDIssued = 0;
    uint public feesEscrowed = 0;

    constructor(
        address _owner,
        address _resolver,
        address payable _WETH
    ) public Owned(_owner) Pausable() MixinSystemSettings(_resolver) {
        _weth = IWETH(_WETH);
    }

    /* ========== VIEWS ========== */
    function resolverAddressesRequired() public view returns (bytes32[] memory addresses) {
        bytes32[] memory existingAddresses = MixinSystemSettings.resolverAddressesRequired();
        bytes32[] memory newAddresses = new bytes32[](5);
        newAddresses[0] = CONTRACT_SYNTHSETH;
        newAddresses[1] = CONTRACT_SYNTHSUSD;
        newAddresses[2] = CONTRACT_EXRATES;
        newAddresses[3] = CONTRACT_ISSUER;
        newAddresses[4] = CONTRACT_FEEPOOL;
        addresses = combineArrays(existingAddresses, newAddresses);
        return addresses;
    }

    /* ========== INTERNAL VIEWS ========== */
    function synthsUSD() internal view returns (ISynth) {
        return ISynth(requireAndGetAddress(CONTRACT_SYNTHSUSD));
    }

    function synthsETH() internal view returns (ISynth) {
        return ISynth(requireAndGetAddress(CONTRACT_SYNTHSETH));
    }

    function feePool() internal view returns (IFeePool) {
        return IFeePool(requireAndGetAddress(CONTRACT_FEEPOOL));
    }

    function exchangeRates() internal view returns (IExchangeRates) {
        return IExchangeRates(requireAndGetAddress(CONTRACT_EXRATES));
    }

    function issuer() internal view returns (IIssuer) {
        return IIssuer(requireAndGetAddress(CONTRACT_ISSUER));
    }

    /* ========== PUBLIC FUNCTIONS ========== */

    // ========== VIEWS ==========

    function capacity() public view returns (uint _capacity) {
        // capacity = max(maxETH - balance, 0)
        uint balance = getReserves();
        if (balance >= maxETH()) {
            return 0;
        }
        return maxETH().sub(balance);
    }

    function getReserves() public view returns (uint) {
        return _weth.balanceOf(address(this));
    }

    function totalIssuedSynths() public view returns (uint) {
        // This contract issues two different synths:
        // 1. sETH
        // 2. sUSD
        //
        // The sETH is always backed 1:1 with WETH.
        // The sUSD fees are backed by sETH that is withheld during minting and burning.
        return exchangeRates().effectiveValue(sETH, sETHIssued, sUSD).add(sUSDIssued);
    }

    function calculateMintFee(uint amount) public view returns (uint) {
        return amount.multiplyDecimalRound(mintFeeRate());
    }

    function calculateBurnFee(uint amount) public view returns (uint) {
        return amount.multiplyDecimalRound(burnFeeRate());
    }

    function maxETH() public view returns (uint256) {
        return getEtherWrapperMaxETH();
    }

    function mintFeeRate() public view returns (uint256) {
        return getEtherWrapperMintFeeRate();
    }

    function burnFeeRate() public view returns (uint256) {
        return getEtherWrapperBurnFeeRate();
    }

    function weth() public view returns (IWETH) {
        return _weth;
    }

    /* ========== MUTATIVE FUNCTIONS ========== */

    // Transfers `amountIn` WETH to mint `amountIn - fees` sETH.
    // `amountIn` is inclusive of fees, calculable via `calculateMintFee`.
    function mint(uint amountIn) external notPaused {
        require(amountIn <= _weth.allowance(msg.sender, address(this)), "Allowance not high enough");
        require(amountIn <= _weth.balanceOf(msg.sender), "Balance is too low");

        uint currentCapacity = capacity();
        require(currentCapacity > 0, "Contract has no spare capacity to mint");

        if (amountIn < currentCapacity) {
            _mint(amountIn);
        } else {
            _mint(currentCapacity);
        }
    }

    // Burns `amountIn` sETH for `amountIn - fees` WETH.
    // `amountIn` is inclusive of fees, calculable via `calculateBurnFee`.
    function burn(uint amountIn) external notPaused {
        uint reserves = getReserves();
        require(reserves > 0, "Contract cannot burn sETH for WETH, WETH balance is zero");

        // principal = [amountIn / (1 + burnFeeRate)]
        uint principal = amountIn.divideDecimalRound(SafeDecimalMath.unit().add(burnFeeRate()));

        if (principal < reserves) {
            _burn(principal, amountIn);
        } else {
            _burn(reserves, reserves.add(calculateBurnFee(reserves)));
        }
    }

    function distributeFees() external {
        // Normalize fee to sUSD
        require(!exchangeRates().rateIsInvalid(sETH), "Currency rate is invalid");
        uint amountSUSD = exchangeRates().effectiveValue(sETH, feesEscrowed, sUSD);

        // Burn sETH.
        synthsETH().burn(address(this), feesEscrowed);
        // Pay down as much sETH debt as we burn. Any other debt is taken on by the stakers.
        sETHIssued = sETHIssued < feesEscrowed ? 0 : sETHIssued.sub(feesEscrowed);

        // Issue sUSD to the fee pool
        issuer().synths(sUSD).issue(feePool().FEE_ADDRESS(), amountSUSD);
        sUSDIssued = sUSDIssued.add(amountSUSD);

        // Tell the fee pool about this
        feePool().recordFeePaid(amountSUSD);

        feesEscrowed = 0;
    }

    // ========== RESTRICTED ==========

    /**
     * @notice Fallback function
     */
    function() external payable {
        revert("Fallback disabled, use mint()");
    }

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

    function _mint(uint amountIn) internal {
        // Calculate minting fee.
        uint feeAmountEth = calculateMintFee(amountIn);
        uint principal = amountIn.sub(feeAmountEth);

        // Transfer WETH from user.
        _weth.transferFrom(msg.sender, address(this), amountIn);

        // Mint `amountIn - fees` sETH to user.
        synthsETH().issue(msg.sender, principal);

        // Escrow fee.
        synthsETH().issue(address(this), feeAmountEth);
        feesEscrowed = feesEscrowed.add(feeAmountEth);

        // Add sETH debt.
        sETHIssued = sETHIssued.add(amountIn);

        emit Minted(msg.sender, principal, feeAmountEth, amountIn);
    }

    function _burn(uint principal, uint amountIn) internal {
        // for burn, amount is inclusive of the fee.
        uint feeAmountEth = amountIn.sub(principal);

        require(amountIn <= IERC20(address(synthsETH())).allowance(msg.sender, address(this)), "Allowance not high enough");
        require(amountIn <= IERC20(address(synthsETH())).balanceOf(msg.sender), "Balance is too low");

        // Burn `amountIn` sETH from user.
        synthsETH().burn(msg.sender, amountIn);
        // sETH debt is repaid by burning.
        sETHIssued = sETHIssued < principal ? 0 : sETHIssued.sub(principal);

        // We use burn/issue instead of burning the principal and transferring the fee.
        // This saves an approval and is cheaper.
        // Escrow fee.
        synthsETH().issue(address(this), feeAmountEth);
        // We don't update sETHIssued, as only the principal was subtracted earlier.
        feesEscrowed = feesEscrowed.add(feeAmountEth);

        // Transfer `amount - fees` WETH to user.
        _weth.transfer(msg.sender, principal);

        emit Burned(msg.sender, principal, feeAmountEth, amountIn);
    }

    /* ========== EVENTS ========== */
    event Minted(address indexed account, uint principal, uint fee, uint amountIn);
    event Burned(address indexed account, uint principal, uint fee, uint amountIn);
}

Contract ABI

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AddressResolver","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"resolverAddressesRequired","outputs":[{"internalType":"bytes32[]","name":"addresses","type":"bytes32[]"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"sETHIssued","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"sUSDIssued","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"bool","name":"_paused","type":"bool"}],"name":"setPaused","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"totalIssuedSynths","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"weth","outputs":[{"internalType":"contract IWETH","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"}]

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

00000000000000000000000073570075092502472e4b61a7058df1a4a1db12f2000000000000000000000000242a3df52c375bee81b1c668741d7c63af68fdd2000000000000000000000000d0a1e359811322d97991e03f863a0c30c2cf029c

-----Decoded View---------------
Arg [0] : _owner (address): 0x73570075092502472e4b61a7058df1a4a1db12f2
Arg [1] : _resolver (address): 0x242a3df52c375bee81b1c668741d7c63af68fdd2
Arg [2] : _WETH (address): 0xd0a1e359811322d97991e03f863a0c30c2cf029c

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 00000000000000000000000073570075092502472e4b61a7058df1a4a1db12f2
Arg [1] : 000000000000000000000000242a3df52c375bee81b1c668741d7c63af68fdd2
Arg [2] : 000000000000000000000000d0a1e359811322d97991e03f863a0c30c2cf029c


Libraries Used


Block Transaction Difficulty Gas Used Reward
Block Uncle Number Difficulty Gas Used Reward
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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.