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Feature Tip: Add private address tag to any address under My Name Tag !
Overview
ETH Balance
0 ETH
Eth Value
$0.00More Info
Private Name Tags
ContractCreator
TokenTracker
Latest 1 from a total of 1 transactions
| Transaction Hash |
Method
|
Block
|
From
|
To
|
|||||
|---|---|---|---|---|---|---|---|---|---|
| Initialize | 12500070 | 1287 days ago | IN | 0 ETH | 0.00374312 |
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Contract Name:
xSNX
Compiler Version
v0.5.15+commit.6a57276f
Contract Source Code (Solidity)
/**
*Submitted for verification at Etherscan.io on 2021-05-24
*/
// File: @openzeppelin/contracts-ethereum-package/contracts/math/SafeMath.sol
pragma solidity ^0.5.0;
/**
* @dev Wrappers over Solidity's arithmetic operations with added overflow
* checks.
*
* Arithmetic operations in Solidity wrap on overflow. This can easily result
* in bugs, because programmers usually assume that an overflow raises an
* error, which is the standard behavior in high level programming languages.
* `SafeMath` restores this intuition by reverting the transaction when an
* operation overflows.
*
* Using this library instead of the unchecked operations eliminates an entire
* class of bugs, so it's recommended to use it always.
*/
library SafeMath {
/**
* @dev Returns the addition of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `+` operator.
*
* Requirements:
* - Addition cannot overflow.
*/
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
require(c >= a, "SafeMath: addition overflow");
return c;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
return sub(a, b, "SafeMath: subtraction overflow");
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting with custom message on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
* - Subtraction cannot overflow.
*
* _Available since v2.4.0._
*/
function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b <= a, errorMessage);
uint256 c = a - b;
return c;
}
/**
* @dev Returns the multiplication of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `*` operator.
*
* Requirements:
* - Multiplication cannot overflow.
*/
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
// Gas optimization: this is cheaper than requiring 'a' not being zero, but the
// benefit is lost if 'b' is also tested.
// See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
if (a == 0) {
return 0;
}
uint256 c = a * b;
require(c / a == b, "SafeMath: multiplication overflow");
return c;
}
/**
* @dev Returns the integer division of two unsigned integers. Reverts on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
* - The divisor cannot be zero.
*/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
return div(a, b, "SafeMath: division by zero");
}
/**
* @dev Returns the integer division of two unsigned integers. Reverts with custom message on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
* - The divisor cannot be zero.
*
* _Available since v2.4.0._
*/
function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
// Solidity only automatically asserts when dividing by 0
require(b > 0, errorMessage);
uint256 c = a / b;
// assert(a == b * c + a % b); // There is no case in which this doesn't hold
return c;
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* Reverts when dividing by zero.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
* - The divisor cannot be zero.
*/
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
return mod(a, b, "SafeMath: modulo by zero");
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* Reverts with custom message when dividing by zero.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
* - The divisor cannot be zero.
*
* _Available since v2.4.0._
*/
function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b != 0, errorMessage);
return a % b;
}
}
// File: @openzeppelin/upgrades/contracts/Initializable.sol
pragma solidity >=0.4.24 <0.7.0;
/**
* @title Initializable
*
* @dev Helper contract to support initializer functions. To use it, replace
* the constructor with a function that has the `initializer` modifier.
* WARNING: Unlike constructors, initializer functions must be manually
* invoked. This applies both to deploying an Initializable contract, as well
* as extending an Initializable contract via inheritance.
* WARNING: When used with inheritance, manual care must be taken to not invoke
* a parent initializer twice, or ensure that all initializers are idempotent,
* because this is not dealt with automatically as with constructors.
*/
contract Initializable {
/**
* @dev Indicates that the contract has been initialized.
*/
bool private initialized;
/**
* @dev Indicates that the contract is in the process of being initialized.
*/
bool private initializing;
/**
* @dev Modifier to use in the initializer function of a contract.
*/
modifier initializer() {
require(initializing || isConstructor() || !initialized, "Contract instance has already been initialized");
bool isTopLevelCall = !initializing;
if (isTopLevelCall) {
initializing = true;
initialized = true;
}
_;
if (isTopLevelCall) {
initializing = false;
}
}
/// @dev Returns true if and only if the function is running in the constructor
function isConstructor() private view returns (bool) {
// extcodesize checks the size of the code stored in an address, and
// address returns the current address. Since the code is still not
// deployed when running a constructor, any checks on its code size will
// yield zero, making it an effective way to detect if a contract is
// under construction or not.
address self = address(this);
uint256 cs;
assembly { cs := extcodesize(self) }
return cs == 0;
}
// Reserved storage space to allow for layout changes in the future.
uint256[50] private ______gap;
}
// File: @openzeppelin/contracts-ethereum-package/contracts/GSN/Context.sol
pragma solidity ^0.5.0;
/*
* @dev Provides information about the current execution context, including the
* sender of the transaction and its data. While these are generally available
* via msg.sender and msg.data, they should not be accessed in such a direct
* manner, since when dealing with GSN meta-transactions the account sending and
* paying for execution may not be the actual sender (as far as an application
* is concerned).
*
* This contract is only required for intermediate, library-like contracts.
*/
contract Context is Initializable {
// Empty internal constructor, to prevent people from mistakenly deploying
// an instance of this contract, which should be used via inheritance.
constructor () internal { }
// solhint-disable-previous-line no-empty-blocks
function _msgSender() internal view returns (address payable) {
return msg.sender;
}
function _msgData() internal view returns (bytes memory) {
this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
return msg.data;
}
}
// File: @openzeppelin/contracts-ethereum-package/contracts/ownership/Ownable.sol
pragma solidity ^0.5.0;
/**
* @dev Contract module which provides a basic access control mechanism, where
* there is an account (an owner) that can be granted exclusive access to
* specific functions.
*
* This module is used through inheritance. It will make available the modifier
* `onlyOwner`, which can be aplied to your functions to restrict their use to
* the owner.
*/
contract Ownable is Initializable, Context {
address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
* @dev Initializes the contract setting the deployer as the initial owner.
*/
function initialize(address sender) public initializer {
_owner = sender;
emit OwnershipTransferred(address(0), _owner);
}
/**
* @dev Returns the address of the current owner.
*/
function owner() public view returns (address) {
return _owner;
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
require(isOwner(), "Ownable: caller is not the owner");
_;
}
/**
* @dev Returns true if the caller is the current owner.
*/
function isOwner() public view returns (bool) {
return _msgSender() == _owner;
}
/**
* @dev Leaves the contract without owner. It will not be possible to call
* `onlyOwner` functions anymore. Can only be called by the current owner.
*
* > Note: Renouncing ownership will leave the contract without an owner,
* thereby removing any functionality that is only available to the owner.
*/
function renounceOwnership() public onlyOwner {
emit OwnershipTransferred(_owner, address(0));
_owner = address(0);
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Can only be called by the current owner.
*/
function transferOwnership(address newOwner) public onlyOwner {
_transferOwnership(newOwner);
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
*/
function _transferOwnership(address newOwner) internal {
require(newOwner != address(0), "Ownable: new owner is the zero address");
emit OwnershipTransferred(_owner, newOwner);
_owner = newOwner;
}
uint256[50] private ______gap;
}
// File: @openzeppelin/contracts-ethereum-package/contracts/token/ERC20/IERC20.sol
pragma solidity ^0.5.0;
/**
* @dev Interface of the ERC20 standard as defined in the EIP. Does not include
* the optional functions; to access them see {ERC20Detailed}.
*/
interface IERC20 {
/**
* @dev Returns the amount of tokens in existence.
*/
function totalSupply() external view returns (uint256);
/**
* @dev Returns the amount of tokens owned by `account`.
*/
function balanceOf(address account) external view returns (uint256);
/**
* @dev Moves `amount` tokens from the caller's account to `recipient`.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transfer(address recipient, uint256 amount) external returns (bool);
/**
* @dev Returns the remaining number of tokens that `spender` will be
* allowed to spend on behalf of `owner` through {transferFrom}. This is
* zero by default.
*
* This value changes when {approve} or {transferFrom} are called.
*/
function allowance(address owner, address spender) external view returns (uint256);
/**
* @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* IMPORTANT: Beware that changing an allowance with this method brings the risk
* that someone may use both the old and the new allowance by unfortunate
* transaction ordering. One possible solution to mitigate this race
* condition is to first reduce the spender's allowance to 0 and set the
* desired value afterwards:
* https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
*
* Emits an {Approval} event.
*/
function approve(address spender, uint256 amount) external returns (bool);
/**
* @dev Moves `amount` tokens from `sender` to `recipient` using the
* allowance mechanism. `amount` is then deducted from the caller's
* allowance.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
/**
* @dev Emitted when `value` tokens are moved from one account (`from`) to
* another (`to`).
*
* Note that `value` may be zero.
*/
event Transfer(address indexed from, address indexed to, uint256 value);
/**
* @dev Emitted when the allowance of a `spender` for an `owner` is set by
* a call to {approve}. `value` is the new allowance.
*/
event Approval(address indexed owner, address indexed spender, uint256 value);
}
// File: @openzeppelin/contracts-ethereum-package/contracts/token/ERC20/ERC20.sol
pragma solidity ^0.5.0;
/**
* @dev Implementation of the {IERC20} interface.
*
* This implementation is agnostic to the way tokens are created. This means
* that a supply mechanism has to be added in a derived contract using {_mint}.
* For a generic mechanism see {ERC20Mintable}.
*
* TIP: For a detailed writeup see our guide
* https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
* to implement supply mechanisms].
*
* We have followed general OpenZeppelin guidelines: functions revert instead
* of returning `false` on failure. This behavior is nonetheless conventional
* and does not conflict with the expectations of ERC20 applications.
*
* Additionally, an {Approval} event is emitted on calls to {transferFrom}.
* This allows applications to reconstruct the allowance for all accounts just
* by listening to said events. Other implementations of the EIP may not emit
* these events, as it isn't required by the specification.
*
* Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
* functions have been added to mitigate the well-known issues around setting
* allowances. See {IERC20-approve}.
*/
contract ERC20 is Initializable, Context, IERC20 {
using SafeMath for uint256;
mapping (address => uint256) private _balances;
mapping (address => mapping (address => uint256)) private _allowances;
uint256 private _totalSupply;
/**
* @dev See {IERC20-totalSupply}.
*/
function totalSupply() public view returns (uint256) {
return _totalSupply;
}
/**
* @dev See {IERC20-balanceOf}.
*/
function balanceOf(address account) public view returns (uint256) {
return _balances[account];
}
/**
* @dev See {IERC20-transfer}.
*
* Requirements:
*
* - `recipient` cannot be the zero address.
* - the caller must have a balance of at least `amount`.
*/
function transfer(address recipient, uint256 amount) public returns (bool) {
_transfer(_msgSender(), recipient, amount);
return true;
}
/**
* @dev See {IERC20-allowance}.
*/
function allowance(address owner, address spender) public view returns (uint256) {
return _allowances[owner][spender];
}
/**
* @dev See {IERC20-approve}.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function approve(address spender, uint256 amount) public returns (bool) {
_approve(_msgSender(), spender, amount);
return true;
}
/**
* @dev See {IERC20-transferFrom}.
*
* Emits an {Approval} event indicating the updated allowance. This is not
* required by the EIP. See the note at the beginning of {ERC20};
*
* Requirements:
* - `sender` and `recipient` cannot be the zero address.
* - `sender` must have a balance of at least `amount`.
* - the caller must have allowance for `sender`'s tokens of at least
* `amount`.
*/
function transferFrom(address sender, address recipient, uint256 amount) public returns (bool) {
_transfer(sender, recipient, amount);
_approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
return true;
}
/**
* @dev Atomically increases the allowance granted to `spender` by the caller.
*
* This is an alternative to {approve} that can be used as a mitigation for
* problems described in {IERC20-approve}.
*
* Emits an {Approval} event indicating the updated allowance.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function increaseAllowance(address spender, uint256 addedValue) public returns (bool) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
return true;
}
/**
* @dev Atomically decreases the allowance granted to `spender` by the caller.
*
* This is an alternative to {approve} that can be used as a mitigation for
* problems described in {IERC20-approve}.
*
* Emits an {Approval} event indicating the updated allowance.
*
* Requirements:
*
* - `spender` cannot be the zero address.
* - `spender` must have allowance for the caller of at least
* `subtractedValue`.
*/
function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
return true;
}
/**
* @dev Moves tokens `amount` from `sender` to `recipient`.
*
* This is internal function is equivalent to {transfer}, and can be used to
* e.g. implement automatic token fees, slashing mechanisms, etc.
*
* Emits a {Transfer} event.
*
* Requirements:
*
* - `sender` cannot be the zero address.
* - `recipient` cannot be the zero address.
* - `sender` must have a balance of at least `amount`.
*/
function _transfer(address sender, address recipient, uint256 amount) internal {
require(sender != address(0), "ERC20: transfer from the zero address");
require(recipient != address(0), "ERC20: transfer to the zero address");
_balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
_balances[recipient] = _balances[recipient].add(amount);
emit Transfer(sender, recipient, amount);
}
/** @dev Creates `amount` tokens and assigns them to `account`, increasing
* the total supply.
*
* Emits a {Transfer} event with `from` set to the zero address.
*
* Requirements
*
* - `to` cannot be the zero address.
*/
function _mint(address account, uint256 amount) internal {
require(account != address(0), "ERC20: mint to the zero address");
_totalSupply = _totalSupply.add(amount);
_balances[account] = _balances[account].add(amount);
emit Transfer(address(0), account, amount);
}
/**
* @dev Destroys `amount` tokens from `account`, reducing the
* total supply.
*
* Emits a {Transfer} event with `to` set to the zero address.
*
* Requirements
*
* - `account` cannot be the zero address.
* - `account` must have at least `amount` tokens.
*/
function _burn(address account, uint256 amount) internal {
require(account != address(0), "ERC20: burn from the zero address");
_balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
_totalSupply = _totalSupply.sub(amount);
emit Transfer(account, address(0), amount);
}
/**
* @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens.
*
* This is internal function is equivalent to `approve`, and can be used to
* e.g. set automatic allowances for certain subsystems, etc.
*
* Emits an {Approval} event.
*
* Requirements:
*
* - `owner` cannot be the zero address.
* - `spender` cannot be the zero address.
*/
function _approve(address owner, address spender, uint256 amount) internal {
require(owner != address(0), "ERC20: approve from the zero address");
require(spender != address(0), "ERC20: approve to the zero address");
_allowances[owner][spender] = amount;
emit Approval(owner, spender, amount);
}
/**
* @dev Destroys `amount` tokens from `account`.`amount` is then deducted
* from the caller's allowance.
*
* See {_burn} and {_approve}.
*/
function _burnFrom(address account, uint256 amount) internal {
_burn(account, amount);
_approve(account, _msgSender(), _allowances[account][_msgSender()].sub(amount, "ERC20: burn amount exceeds allowance"));
}
uint256[50] private ______gap;
}
// File: @openzeppelin/contracts-ethereum-package/contracts/token/ERC20/ERC20Detailed.sol
pragma solidity ^0.5.0;
/**
* @dev Optional functions from the ERC20 standard.
*/
contract ERC20Detailed is Initializable, IERC20 {
string private _name;
string private _symbol;
uint8 private _decimals;
/**
* @dev Sets the values for `name`, `symbol`, and `decimals`. All three of
* these values are immutable: they can only be set once during
* construction.
*/
function initialize(string memory name, string memory symbol, uint8 decimals) public initializer {
_name = name;
_symbol = symbol;
_decimals = decimals;
}
/**
* @dev Returns the name of the token.
*/
function name() public view returns (string memory) {
return _name;
}
/**
* @dev Returns the symbol of the token, usually a shorter version of the
* name.
*/
function symbol() public view returns (string memory) {
return _symbol;
}
/**
* @dev Returns the number of decimals used to get its user representation.
* For example, if `decimals` equals `2`, a balance of `505` tokens should
* be displayed to a user as `5,05` (`505 / 10 ** 2`).
*
* Tokens usually opt for a value of 18, imitating the relationship between
* Ether and Wei.
*
* NOTE: This information is only used for _display_ purposes: it in
* no way affects any of the arithmetic of the contract, including
* {IERC20-balanceOf} and {IERC20-transfer}.
*/
function decimals() public view returns (uint8) {
return _decimals;
}
uint256[50] private ______gap;
}
// File: synthetix/contracts/interfaces/ISynth.sol
pragma solidity >=0.4.24;
// 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;
}
// File: synthetix/contracts/interfaces/IVirtualSynth.sol
pragma solidity >=0.4.24;
interface IVirtualSynth {
// Views
function balanceOfUnderlying(address account) external view returns (uint);
function rate() external view returns (uint);
function readyToSettle() external view returns (bool);
function secsLeftInWaitingPeriod() external view returns (uint);
function settled() external view returns (bool);
function synth() external view returns (ISynth);
// Mutative functions
function settle(address account) external;
}
// File: synthetix/contracts/interfaces/ISynthetix.sol
pragma solidity >=0.4.24;
// https://docs.synthetix.io/contracts/source/interfaces/isynthetix
interface ISynthetix {
// 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 collateral(address account) external view returns (uint);
function collateralisationRatio(address issuer) external view returns (uint);
function debtBalanceOf(address issuer, bytes32 currencyKey) external view returns (uint);
function isWaitingPeriod(bytes32 currencyKey) external view returns (bool);
function maxIssuableSynths(address issuer) external view returns (uint maxIssuable);
function remainingIssuableSynths(address issuer)
external
view
returns (
uint maxIssuable,
uint alreadyIssued,
uint totalSystemDebt
);
function synths(bytes32 currencyKey) external view returns (ISynth);
function synthsByAddress(address synthAddress) external view returns (bytes32);
function totalIssuedSynths(bytes32 currencyKey) external view returns (uint);
function totalIssuedSynthsExcludeEtherCollateral(bytes32 currencyKey) external view returns (uint);
function transferableSynthetix(address account) external view returns (uint transferable);
// Mutative Functions
function burnSynths(uint amount) external;
function burnSynthsOnBehalf(address burnForAddress, uint amount) external;
function burnSynthsToTarget() external;
function burnSynthsToTargetOnBehalf(address burnForAddress) external;
function exchange(
bytes32 sourceCurrencyKey,
uint sourceAmount,
bytes32 destinationCurrencyKey
) external returns (uint amountReceived);
function exchangeOnBehalf(
address exchangeForAddress,
bytes32 sourceCurrencyKey,
uint sourceAmount,
bytes32 destinationCurrencyKey
) external returns (uint amountReceived);
function exchangeWithTracking(
bytes32 sourceCurrencyKey,
uint sourceAmount,
bytes32 destinationCurrencyKey,
address originator,
bytes32 trackingCode
) external returns (uint amountReceived);
function exchangeOnBehalfWithTracking(
address exchangeForAddress,
bytes32 sourceCurrencyKey,
uint sourceAmount,
bytes32 destinationCurrencyKey,
address originator,
bytes32 trackingCode
) external returns (uint amountReceived);
function exchangeWithVirtual(
bytes32 sourceCurrencyKey,
uint sourceAmount,
bytes32 destinationCurrencyKey,
bytes32 trackingCode
) external returns (uint amountReceived, IVirtualSynth vSynth);
function issueMaxSynths() external;
function issueMaxSynthsOnBehalf(address issueForAddress) external;
function issueSynths(uint amount) external;
function issueSynthsOnBehalf(address issueForAddress, uint amount) external;
function mint() external returns (bool);
function settle(bytes32 currencyKey)
external
returns (
uint reclaimed,
uint refunded,
uint numEntries
);
// Liquidations
function liquidateDelinquentAccount(address account, uint susdAmount) external returns (bool);
// Restricted Functions
function mintSecondary(address account, uint amount) external;
function mintSecondaryRewards(uint amount) external;
function burnSecondary(address account, uint amount) external;
}
// File: synthetix/contracts/interfaces/IRewardEscrowV2.sol
pragma solidity >=0.4.24;
pragma experimental ABIEncoderV2;
library VestingEntries {
struct VestingEntry {
uint64 endTime;
uint256 escrowAmount;
}
struct VestingEntryWithID {
uint64 endTime;
uint256 escrowAmount;
uint256 entryID;
}
}
interface IRewardEscrowV2 {
// Views
function balanceOf(address account) external view returns (uint);
function numVestingEntries(address account) external view returns (uint);
function totalEscrowedAccountBalance(address account) external view returns (uint);
function totalVestedAccountBalance(address account) external view returns (uint);
function getVestingQuantity(address account, uint256[] calldata entryIDs) external view returns (uint);
function getVestingSchedules(
address account,
uint256 index,
uint256 pageSize
) external view returns (VestingEntries.VestingEntryWithID[] memory);
function getAccountVestingEntryIDs(
address account,
uint256 index,
uint256 pageSize
) external view returns (uint256[] memory);
function getVestingEntryClaimable(address account, uint256 entryID) external view returns (uint);
function getVestingEntry(address account, uint256 entryID) external view returns (uint64, uint256);
// Mutative functions
function vest(uint256[] calldata entryIDs) external;
function createEscrowEntry(
address beneficiary,
uint256 deposit,
uint256 duration
) external;
function appendVestingEntry(
address account,
uint256 quantity,
uint256 duration
) external;
function migrateVestingSchedule(address _addressToMigrate) external;
function migrateAccountEscrowBalances(
address[] calldata accounts,
uint256[] calldata escrowBalances,
uint256[] calldata vestedBalances
) external;
// Account Merging
function startMergingWindow() external;
function mergeAccount(address accountToMerge, uint256[] calldata entryIDs) external;
function nominateAccountToMerge(address account) external;
function accountMergingIsOpen() external view returns (bool);
// L2 Migration
function importVestingEntries(
address account,
uint256 escrowedAmount,
VestingEntries.VestingEntry[] calldata vestingEntries
) external;
// Return amount of SNX transfered to SynthetixBridgeToOptimism deposit contract
function burnForMigration(address account, uint256[] calldata entryIDs)
external
returns (uint256 escrowedAccountBalance, VestingEntries.VestingEntry[] memory vestingEntries);
}
// File: synthetix/contracts/interfaces/IExchangeRates.sol
pragma solidity >=0.4.24;
// 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;
}
// File: synthetix/contracts/interfaces/ISynthetixState.sol
pragma solidity >=0.4.24;
// https://docs.synthetix.io/contracts/source/interfaces/isynthetixstate
interface ISynthetixState {
// Views
function debtLedger(uint index) external view returns (uint);
function issuanceData(address account) external view returns (uint initialDebtOwnership, uint debtEntryIndex);
function debtLedgerLength() external view returns (uint);
function hasIssued(address account) external view returns (bool);
function lastDebtLedgerEntry() external view returns (uint);
// Mutative functions
function incrementTotalIssuerCount() external;
function decrementTotalIssuerCount() external;
function setCurrentIssuanceData(address account, uint initialDebtOwnership) external;
function appendDebtLedgerValue(uint value) external;
function clearIssuanceData(address account) external;
}
// File: synthetix/contracts/interfaces/IAddressResolver.sol
pragma solidity >=0.4.24;
// 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);
}
// File: contracts/interface/ISystemSettings.sol
pragma solidity 0.5.15;
interface ISystemSettings {
function issuanceRatio() external view returns(uint);
}
// File: contracts/interface/ICurveFi.sol
pragma solidity 0.5.15;
interface ICurveFi {
function exchange(
int128 i,
int128 j,
uint256 dx,
uint256 min_dy
) external;
function exchange_underlying(
int128 i,
int128 j,
uint256 dx,
uint256 min_dy
) external;
function get_dx_underlying(
int128 i,
int128 j,
uint256 dy
) external view returns (uint256);
function get_dy_underlying(
int128 i,
int128 j,
uint256 dx
) external view returns (uint256);
function get_dx(
int128 i,
int128 j,
uint256 dy
) external view returns (uint256);
function get_dy(
int128 i,
int128 j,
uint256 dx
) external view returns (uint256);
function get_virtual_price() external view returns (uint256);
}
// File: contracts/interface/ISetToken.sol
pragma solidity 0.5.15;
interface ISetToken {
function unitShares() external view returns(uint);
function naturalUnit() external view returns(uint);
function currentSet() external view returns(address);
// function getUnits() external view returns (uint256[] memory);
}
// File: contracts/interface/IKyberNetworkProxy.sol
pragma solidity 0.5.15;
contract IKyberNetworkProxy {
function getExpectedRate(ERC20 src, ERC20 dest, uint srcQty) external view returns (uint expectedRate, uint slippageRate);
function swapEtherToToken(ERC20 token, uint minConversionRate) external payable returns(uint);
function swapTokenToEther(ERC20 token, uint tokenQty, uint minRate) external payable returns(uint);
function swapTokenToToken(ERC20 src, uint srcAmount, ERC20 dest, uint minConversionRate) public returns(uint);
}
// File: contracts/interface/ISetAssetBaseCollateral.sol
pragma solidity 0.5.15;
interface ISetAssetBaseCollateral {
function getComponents() external view returns(address[] memory);
function naturalUnit() external view returns(uint);
function getUnits() external view returns (uint256[] memory);
}
// File: contracts/TradeAccounting.sol
pragma solidity 0.5.15;
/*
xSNX Target Allocation (assuming 800% C-RATIO)
----------------------
Allocation | NAV | % NAV
--------------------------------------
800 SNX @ $1/token | $800 | 100%
100 sUSD Debt | ($100) | (12.5%)
75 USD equiv Set | $75 | 9.375%
25 USD equiv ETH | $25 | 3.125%
--------------------------------------
Total $800 | 100%
*/
/*
Conditions for `isRebalanceTowardsHedgeRequired` to return true
Assuming 5% rebalance threshold
Allocation | NAV | % NAV
--------------------------------------
800 SNX @ $1/token | $800 | 100.63%
105 sUSD Debt | ($105) | (13.21%)
75 USD equiv Set | $75 | 9.43%
25 USD equiv ETH | $25 | 3.14%
--------------------------------------
Total $795 | 100%
Debt value | $105
Hedge Assets | $100
-------------------------
Debt/hedge ratio | 105%
*/
/*
Conditions for `isRebalanceTowardsSnxRequired` to return true
Assuming 5% rebalance threshold
Allocation | NAV | % NAV
--------------------------------------
800 SNX @ $1/token | $800 | 99.37%
100 sUSD Debt | ($100) | (12.42%)
75 USD equiv Set | $75 | 9.31%
30 USD equiv ETH | $30 | 3.72%
--------------------------------------
Total $805 | 100%
Hedge Assets | $105
Debt value | $100
-------------------------
Hedge/debt ratio | 105%
*/
contract TradeAccounting is Ownable {
using SafeMath for uint256;
uint256 private constant TEN = 10;
uint256 private constant DEC_18 = 1e18;
uint256 private constant PERCENT = 100;
uint256 private constant ETH_TARGET = 4; // targets 1/4th of hedge portfolio
uint256 private constant SLIPPAGE_RATE = 99;
uint256 private constant MAX_UINT = 2**256 - 1;
uint256 private constant RATE_STALE_TIME = 28800; // 8 hours
uint256 private constant REBALANCE_THRESHOLD = 105; // 5%
uint256 private constant INITIAL_SUPPLY_MULTIPLIER = 10;
int128 usdcIndex;
int128 susdIndex;
ICurveFi private curveFi;
ISynthetixState private synthetixState;
IAddressResolver private addressResolver;
IKyberNetworkProxy private kyberNetworkProxy;
address private xSNXAdminInstance;
address private addressValidator;
address private setAddress;
address private susdAddress;
address private usdcAddress;
address private nextCurveAddress;
bytes32 constant snx = "SNX";
bytes32 constant susd = "sUSD";
bytes32 constant seth = "sETH";
bytes32[2] synthSymbols;
address[2] setComponentAddresses;
bytes32 constant rewardEscrowName = "RewardEscrow";
bytes32 constant exchangeRatesName = "ExchangeRates";
bytes32 constant synthetixName = "Synthetix";
bytes32 constant systemSettingsName = "SystemSettings";
bytes32 constant rewardEscrowV2Name = "RewardEscrowV2";
uint256 private constant RATE_STALE_TIME_NEW = 86400; // 24 hours
function initialize(
address _setAddress,
address _kyberProxyAddress,
address _addressResolver,
address _susdAddress,
address _usdcAddress,
address _addressValidator,
bytes32[2] memory _synthSymbols,
address[2] memory _setComponentAddresses,
address _ownerAddress
) public initializer {
Ownable.initialize(_ownerAddress);
setAddress = _setAddress;
kyberNetworkProxy = IKyberNetworkProxy(_kyberProxyAddress);
addressResolver = IAddressResolver(_addressResolver);
susdAddress = _susdAddress;
usdcAddress = _usdcAddress;
addressValidator = _addressValidator;
synthSymbols = _synthSymbols;
setComponentAddresses = _setComponentAddresses;
}
modifier onlyXSNXAdmin {
require(
msg.sender == xSNXAdminInstance,
"Only xSNXAdmin contract can call"
);
_;
}
/* ========================================================================================= */
/* Kyber/Curve */
/* ========================================================================================= */
/*
* @dev Function that processes all token to token exchanges,
* sometimes via Kyber and sometimes via a combination of Kyber & Curve
* @dev Only callable by xSNXAdmin contract
*/
function swapTokenToToken(
address fromToken,
uint256 amount,
address toToken,
uint256 minKyberRate,
uint256 minCurveReturn
) public onlyXSNXAdmin {
if (fromToken == susdAddress) {
_exchangeUnderlying(susdIndex, usdcIndex, amount, minCurveReturn);
if (toToken != usdcAddress) {
uint256 usdcBal = getUsdcBalance();
_swapTokenToToken(usdcAddress, usdcBal, toToken, minKyberRate);
}
} else if (toToken == susdAddress) {
if (fromToken != usdcAddress) {
_swapTokenToToken(fromToken, amount, usdcAddress, minKyberRate);
}
uint256 usdcBal = getUsdcBalance();
_exchangeUnderlying(usdcIndex, susdIndex, usdcBal, minCurveReturn);
} else {
_swapTokenToToken(fromToken, amount, toToken, minKyberRate);
}
IERC20(toToken).transfer(
xSNXAdminInstance,
IERC20(toToken).balanceOf(address(this))
);
}
function _swapTokenToToken(
address _fromToken,
uint256 _amount,
address _toToken,
uint256 _minKyberRate
) private {
kyberNetworkProxy.swapTokenToToken(
ERC20(_fromToken),
_amount,
ERC20(_toToken),
_minKyberRate
);
}
/*
* @dev Function that processes all token to ETH exchanges,
* sometimes via Kyber and sometimes via a combination of Kyber & Curve
* @dev Only callable by xSNXAdmin contract
*/
function swapTokenToEther(
address fromToken,
uint256 amount,
uint256 minKyberRate,
uint256 minCurveReturn
) public onlyXSNXAdmin {
if (fromToken == susdAddress) {
_exchangeUnderlying(susdIndex, usdcIndex, amount, minCurveReturn);
uint256 usdcBal = getUsdcBalance();
_swapTokenToEther(usdcAddress, usdcBal, minKyberRate);
} else {
_swapTokenToEther(fromToken, amount, minKyberRate);
}
uint256 ethBal = address(this).balance;
(bool success, ) = msg.sender.call.value(ethBal)("");
require(success, "Transfer failed");
}
function _swapTokenToEther(
address _fromToken,
uint256 _amount,
uint256 _minKyberRate
) private {
kyberNetworkProxy.swapTokenToEther(
ERC20(_fromToken),
_amount,
_minKyberRate
);
}
function _exchangeUnderlying(
int128 _inputIndex,
int128 _outputIndex,
uint256 _amount,
uint256 _minReturn
) private {
curveFi.exchange_underlying(
_inputIndex,
_outputIndex,
_amount,
_minReturn
);
}
function getUsdcBalance() internal view returns (uint256) {
return IERC20(usdcAddress).balanceOf(address(this));
}
/* ========================================================================================= */
/* NAV */
/* ========================================================================================= */
function getEthBalance() public view returns (uint256) {
return address(xSNXAdminInstance).balance;
}
/*
* @dev Helper function for `xSNX.burn` that outputs NAV
* redemption value in ETH terms
* @param totalSupply: xSNX.totalSupply()
* @param tokensToRedeem: xSNX to burn
*/
function calculateRedemptionValue(
uint256 totalSupply,
uint256 tokensToRedeem
) public view returns (uint256 valueToRedeem) {
uint256 snxBalanceOwned = getSnxBalanceOwned();
uint256 contractDebtValue = getContractDebtValue();
uint256 pricePerToken = calculateRedeemTokenPrice(
totalSupply,
snxBalanceOwned,
contractDebtValue
);
valueToRedeem = pricePerToken.mul(tokensToRedeem).div(DEC_18);
}
/*
* @dev Helper function for `xSNX.mint` that
* 1) determines whether ETH contribution should be maintained in ETH or exchanged for SNX and
* 2) outputs the `nonSnxAssetValue` value to be used in NAV calculation
* @param totalSupply: xSNX.totalSupply()
*/
function getMintWithEthUtils(uint256 totalSupply)
public
view
returns (bool allocateToEth, uint256 nonSnxAssetValue)
{
uint256 setHoldingsInWei = getSetHoldingsValueInWei();
// called before eth transferred from xSNX to xSNXAdmin
uint256 ethBalBefore = getEthBalance();
allocateToEth = shouldAllocateEthToEthReserve(
setHoldingsInWei,
ethBalBefore,
totalSupply
);
nonSnxAssetValue = setHoldingsInWei.add(ethBalBefore);
}
/*
* @notice xSNX system targets 25% of hedge portfolio to be maintained in ETH
* @dev Function produces binary yes allocate/no allocate decision point
* determining whether ETH sent on xSNX.mint() is held or exchanged
* @param setHoldingsInWei: value of Set portfolio in ETH terms
* @param ethBalBefore: value of ETH reserve prior to tx
* @param totalSupply: xSNX.totalSupply()
*/
function shouldAllocateEthToEthReserve(
uint256 setHoldingsInWei,
uint256 ethBalBefore,
uint256 totalSupply
) public pure returns (bool allocateToEth) {
if (totalSupply == 0) return false;
if (ethBalBefore.mul(ETH_TARGET) < ethBalBefore.add(setHoldingsInWei)) {
// ETH reserve is under target
return true;
}
return false;
}
/*
* @dev Helper function for calculateIssueTokenPrice
* @dev Called indirectly by `xSNX.mint` and `xSNX.mintWithSnx`
* @dev Calculates NAV of the fund, including value of escrowed SNX, in ETH terms
* @param weiPerOneSnx: SNX price in ETH terms
* @param snxBalanceBefore: SNX balance pre-mint
* @param nonSnxAssetValue: NAV of non-SNX slice of fund
*/
function calculateNetAssetValueOnMint(
uint256 weiPerOneSnx,
uint256 snxBalanceBefore,
uint256 nonSnxAssetValue
) internal view returns (uint256) {
uint256 snxTokenValueInWei = snxBalanceBefore.mul(weiPerOneSnx).div(
DEC_18
);
uint256 contractDebtValue = getContractDebtValue();
uint256 contractDebtValueInWei = calculateDebtValueInWei(
contractDebtValue
);
return
snxTokenValueInWei.add(nonSnxAssetValue).sub(
contractDebtValueInWei
);
}
/*
* @dev Helper function for calculateRedeemTokenPrice
* @dev Called indirectly by `xSNX.burn`
* @dev Calculates NAV of the fund, excluding value of escrowed SNX, in ETH terms
* @param weiPerOneSnx: SNX price in ETH terms
* @param snxBalanceOwned: non-escrowed SNX balance
* @param contractDebtValueInWei: sUSD debt balance of fund in ETH terms
*/
function calculateNetAssetValueOnRedeem(
uint256 weiPerOneSnx,
uint256 snxBalanceOwned,
uint256 contractDebtValueInWei
) internal view returns (uint256) {
uint256 snxTokenValueInWei = snxBalanceOwned.mul(weiPerOneSnx).div(
DEC_18
);
uint256 nonSnxAssetValue = calculateNonSnxAssetValue();
return
snxTokenValueInWei.add(nonSnxAssetValue).sub(
contractDebtValueInWei
);
}
/*
* @dev NAV value of non-SNX assets, computed in ETH terms
*/
function calculateNonSnxAssetValue() internal view returns (uint256) {
return getSetHoldingsValueInWei().add(getEthBalance());
}
/*
* @dev SNX price in ETH terms, calculated for purposes of redemption NAV
* @notice Return value discounted slightly to better represent liquidation price
*/
function getWeiPerOneSnxOnRedeem()
internal
view
returns (uint256 weiPerOneSnx)
{
uint256 snxUsdPrice = getSnxPrice();
uint256 ethUsdPrice = getSynthPrice(seth);
weiPerOneSnx = snxUsdPrice
.mul(DEC_18)
.div(ethUsdPrice)
.mul(SLIPPAGE_RATE) // used to better represent liquidation price as volume scales
.div(PERCENT);
}
/*
* @dev Returns Synthetix synth symbol for asset currently held in TokenSet (e.g., sETH for WETH)
* @notice xSNX contract complex only compatible with Sets that hold a single asset at a time
*/
function getActiveAssetSynthSymbol()
internal
view
returns (bytes32 synthSymbol)
{
synthSymbol = getAssetCurrentlyActiveInSet() == setComponentAddresses[0]
? (synthSymbols[0])
: (synthSymbols[1]);
}
/*
* @dev Returns SNX price in ETH terms, calculated for purposes of issuance NAV (when allocateToEth)
*/
function getWeiPerOneSnxOnMint() internal view returns (uint256) {
uint256 snxUsd = getSynthPrice(snx);
uint256 ethUsd = getSynthPrice(seth);
return snxUsd.mul(DEC_18).div(ethUsd);
}
/*
* @dev Single use function to define initial xSNX issuance
*/
function getInitialSupply() internal view returns (uint256) {
return
IERC20(addressResolver.getAddress(synthetixName))
.balanceOf(xSNXAdminInstance)
.mul(INITIAL_SUPPLY_MULTIPLIER);
}
/*
* @dev Helper function for `xSNX.mint` that calculates token issuance
* @param snxBalanceBefore: SNX balance pre-mint
* @param ethContributed: ETH payable on mint, less fees
* @param nonSnxAssetValue: NAV of non-SNX slice of fund
* @param totalSupply: xSNX.totalSupply()
*/
function calculateTokensToMintWithEth(
uint256 snxBalanceBefore,
uint256 ethContributed,
uint256 nonSnxAssetValue,
uint256 totalSupply
) public view returns (uint256) {
if (totalSupply == 0) {
return getInitialSupply();
}
uint256 pricePerToken = calculateIssueTokenPrice(
getWeiPerOneSnxOnMint(),
snxBalanceBefore,
nonSnxAssetValue,
totalSupply
);
return ethContributed.mul(DEC_18).div(pricePerToken);
}
/*
* @dev Helper function for `xSNX.mintWithSnx` that calculates token issuance
* @param snxBalanceBefore: SNX balance pre-mint
* @param snxAddedToBalance: SNX contributed by mint
* @param totalSupply: xSNX.totalSupply()
*/
function calculateTokensToMintWithSnx(
uint256 snxBalanceBefore,
uint256 snxAddedToBalance,
uint256 totalSupply
) public view returns (uint256) {
if (totalSupply == 0) {
return getInitialSupply();
}
uint256 weiPerOneSnx = getWeiPerOneSnxOnMint();
// need to derive snx contribution in eth terms for NAV calc
uint256 proxyEthContribution = weiPerOneSnx.mul(snxAddedToBalance).div(
DEC_18
);
uint256 nonSnxAssetValue = calculateNonSnxAssetValue();
uint256 pricePerToken = calculateIssueTokenPrice(
weiPerOneSnx,
snxBalanceBefore,
nonSnxAssetValue,
totalSupply
);
return proxyEthContribution.mul(DEC_18).div(pricePerToken);
}
/*
* @dev Called indirectly by `xSNX.mint` and `xSNX.mintWithSnx`
* @dev Calculates token price on issuance, including value of escrowed SNX
* @param weiPerOneSnx: SNX price in ETH terms
* @param snxBalanceBefore: SNX balance pre-mint
* @param nonSnxAssetValue: Non-SNX slice of fund
* @param totalSupply: xSNX.totalSupply()
*/
function calculateIssueTokenPrice(
uint256 weiPerOneSnx,
uint256 snxBalanceBefore,
uint256 nonSnxAssetValue,
uint256 totalSupply
) public view returns (uint256 pricePerToken) {
pricePerToken = calculateNetAssetValueOnMint(
weiPerOneSnx,
snxBalanceBefore,
nonSnxAssetValue
)
.mul(DEC_18)
.div(totalSupply);
}
/*
* @dev Called indirectly by `xSNX.burn`
* @dev Calculates token price on redemption, excluding value of escrowed SNX
* @param totalSupply: xSNX.totalSupply()
* @param snxBalanceOwned: non-escrowed SNX balance
* @param contractDebtValue: sUSD debt in USD terms
*/
function calculateRedeemTokenPrice(
uint256 totalSupply,
uint256 snxBalanceOwned,
uint256 contractDebtValue
) public view returns (uint256 pricePerToken) {
// SNX won't actually be sold (burns are only distributed in available ETH) but
// this is a proxy for the return value of SNX that would be sold
uint256 weiPerOneSnx = getWeiPerOneSnxOnRedeem();
uint256 debtValueInWei = calculateDebtValueInWei(contractDebtValue);
pricePerToken = calculateNetAssetValueOnRedeem(
weiPerOneSnx,
snxBalanceOwned,
debtValueInWei
)
.mul(DEC_18)
.div(totalSupply);
}
/* ========================================================================================= */
/* Set */
/* ========================================================================================= */
/*
* @dev Balance of underlying asset "active" in Set (e.g., WETH or USDC)
*/
function getActiveSetAssetBalance() public view returns (uint256) {
return
IERC20(getAssetCurrentlyActiveInSet()).balanceOf(xSNXAdminInstance);
}
/*
* @dev Calculates quantity of Set Token equivalent to quantity of underlying asset token
* @notice rebalancingSetQuantity return value is reduced slightly to ensure successful execution
* @param componentQuantity: balance of underlying Set asset, e.g., WETH
*/
function calculateSetQuantity(uint256 componentQuantity)
public
view
returns (uint256 rebalancingSetQuantity)
{
uint256 baseSetNaturalUnit = getBaseSetNaturalUnit();
uint256 baseSetComponentUnits = getBaseSetComponentUnits();
uint256 baseSetIssuable = componentQuantity.mul(baseSetNaturalUnit).div(
baseSetComponentUnits
);
uint256 rebalancingSetNaturalUnit = getSetNaturalUnit();
uint256 unitShares = getSetUnitShares();
rebalancingSetQuantity = baseSetIssuable
.mul(rebalancingSetNaturalUnit)
.div(unitShares)
.mul(99) // ensure sufficient balance in underlying asset
.div(100)
.div(rebalancingSetNaturalUnit)
.mul(rebalancingSetNaturalUnit);
}
/*
* @dev Calculates mintable quantity of Set Token given asset holdings
*/
function calculateSetIssuanceQuantity()
public
view
returns (uint256 rebalancingSetIssuable)
{
uint256 componentQuantity = getActiveSetAssetBalance();
rebalancingSetIssuable = calculateSetQuantity(componentQuantity);
}
/*
* @dev Calculates Set token to sell given sUSD burn requirements
* @param totalSusdToBurn: sUSD to burn to fix ratio or unlock staked SNX
*/
function calculateSetRedemptionQuantity(uint256 totalSusdToBurn)
public
view
returns (uint256 rebalancingSetRedeemable)
{
address currentSetAsset = getAssetCurrentlyActiveInSet();
bytes32 activeAssetSynthSymbol = getActiveAssetSynthSymbol();
uint256 synthUsd = getSynthPrice(activeAssetSynthSymbol);
// expectedSetAssetRate = amount of current set asset needed to redeem for 1 sUSD
uint256 expectedSetAssetRate = DEC_18.mul(DEC_18).div(synthUsd);
uint256 setAssetCollateralToSell = expectedSetAssetRate
.mul(totalSusdToBurn)
.div(DEC_18)
.mul(103) // err on the high side
.div(PERCENT);
uint256 decimals = (TEN**ERC20Detailed(currentSetAsset).decimals());
setAssetCollateralToSell = setAssetCollateralToSell.mul(decimals).div(
DEC_18
);
rebalancingSetRedeemable = calculateSetQuantity(
setAssetCollateralToSell
);
}
/*
* @dev Calculates value of a single 1e18 Set unit in ETH terms
*/
function calculateEthValueOfOneSetUnit()
internal
view
returns (uint256 ethValue)
{
uint256 unitShares = getSetUnitShares();
uint256 rebalancingSetNaturalUnit = getSetNaturalUnit();
uint256 baseSetRequired = DEC_18.mul(unitShares).div(
rebalancingSetNaturalUnit
);
uint256 unitsOfUnderlying = getBaseSetComponentUnits();
uint256 baseSetNaturalUnit = getBaseSetNaturalUnit();
uint256 componentRequired = baseSetRequired.mul(unitsOfUnderlying).div(
baseSetNaturalUnit
);
address currentSetAsset = getAssetCurrentlyActiveInSet();
uint256 decimals = (TEN**ERC20Detailed(currentSetAsset).decimals());
componentRequired = componentRequired.mul(DEC_18).div(decimals);
bytes32 activeAssetSynthSymbol = getActiveAssetSynthSymbol();
uint256 synthUsd = getSynthPrice(activeAssetSynthSymbol);
uint256 ethUsd = getSynthPrice(seth);
ethValue = componentRequired.mul(synthUsd).div(ethUsd);
}
/*
* @dev Calculates value of Set Holdings in ETH terms
*/
function getSetHoldingsValueInWei()
public
view
returns (uint256 setValInWei)
{
uint256 setCollateralTokens = getSetCollateralTokens();
bytes32 synthSymbol = getActiveAssetSynthSymbol();
address currentSetAsset = getAssetCurrentlyActiveInSet();
uint256 synthUsd = getSynthPrice(synthSymbol);
uint256 ethUsd = getSynthPrice(seth);
uint256 decimals = (TEN**ERC20Detailed(currentSetAsset).decimals());
setCollateralTokens = setCollateralTokens.mul(DEC_18).div(decimals);
setValInWei = setCollateralTokens.mul(synthUsd).div(ethUsd);
}
function getBaseSetNaturalUnit() internal view returns (uint256) {
return getCurrentCollateralSet().naturalUnit();
}
/*
* @dev Outputs current active Set asset
* @notice xSNX contracts complex only compatible with Sets that hold a single asset at a time
*/
function getAssetCurrentlyActiveInSet() public view returns (address) {
address[] memory currentAllocation = getCurrentCollateralSet()
.getComponents();
return currentAllocation[0];
}
function getCurrentCollateralSet()
internal
view
returns (ISetAssetBaseCollateral)
{
return ISetAssetBaseCollateral(getCurrentSet());
}
function getCurrentSet() internal view returns (address) {
return ISetToken(setAddress).currentSet();
}
/*
* @dev Returns the number of underlying tokens in the current Set asset
* e.g., the contract's Set holdings are collateralized by 10.4 WETH
*/
function getSetCollateralTokens() internal view returns (uint256) {
return
getSetBalanceCollateral().mul(getBaseSetComponentUnits()).div(
getBaseSetNaturalUnit()
);
}
function getSetBalanceCollateral() internal view returns (uint256) {
uint256 unitShares = getSetUnitShares();
uint256 naturalUnit = getSetNaturalUnit();
return getContractSetBalance().mul(unitShares).div(naturalUnit);
}
function getSetUnitShares() internal view returns (uint256) {
return ISetToken(setAddress).unitShares();
}
function getSetNaturalUnit() internal view returns (uint256) {
return ISetToken(setAddress).naturalUnit();
}
function getContractSetBalance() internal view returns (uint256) {
return IERC20(setAddress).balanceOf(xSNXAdminInstance);
}
function getBaseSetComponentUnits() internal view returns (uint256) {
return ISetAssetBaseCollateral(getCurrentSet()).getUnits()[0];
}
/* ========================================================================================= */
/* Synthetix */
/* ========================================================================================= */
function getSusdBalance() public view returns (uint256) {
return IERC20(susdAddress).balanceOf(xSNXAdminInstance);
}
function getSnxBalance() public view returns (uint256) {
return getSnxBalanceOwned().add(getSnxBalanceEscrowed());
}
function getSnxBalanceOwned() internal view returns (uint256) {
return
IERC20(addressResolver.getAddress(synthetixName)).balanceOf(
xSNXAdminInstance
);
}
function getSnxBalanceEscrowed() internal view returns (uint256) {
return
IRewardEscrowV2(addressResolver.getAddress(rewardEscrowV2Name))
.balanceOf(xSNXAdminInstance);
}
function getContractEscrowedSnxValue() internal view returns (uint256) {
return getSnxBalanceEscrowed().mul(getSnxPrice()).div(DEC_18);
}
function getContractOwnedSnxValue() internal view returns (uint256) {
return getSnxBalanceOwned().mul(getSnxPrice()).div(DEC_18);
}
function getSnxPrice() internal view returns (uint256) {
(uint256 rate, uint256 time) = IExchangeRates(
addressResolver.getAddress(exchangeRatesName)
)
.rateAndUpdatedTime(snx);
require(time.add(RATE_STALE_TIME_NEW) > block.timestamp, "Rate stale");
return rate;
}
function getSynthPrice(bytes32 synth) internal view returns (uint256) {
(uint256 rate, uint256 time) = IExchangeRates(
addressResolver.getAddress(exchangeRatesName)
)
.rateAndUpdatedTime(synth);
if (synth != susd) {
require(time.add(RATE_STALE_TIME_NEW) > block.timestamp, "Rate stale");
}
return rate;
}
/*
* @dev Converts sUSD debt value into ETH terms
* @param debtValue: sUSD-denominated debt value
*/
function calculateDebtValueInWei(uint256 debtValue)
internal
view
returns (uint256 debtBalanceInWei)
{
uint256 ethUsd = getSynthPrice(seth);
debtBalanceInWei = debtValue.mul(DEC_18).div(ethUsd);
}
function getContractDebtValue() internal view returns (uint256) {
return
ISynthetix(addressResolver.getAddress(synthetixName)).debtBalanceOf(
xSNXAdminInstance,
susd
);
}
/*
* @notice Returns inverse of target C-RATIO
*/
function getIssuanceRatio() internal view returns (uint256) {
return
ISystemSettings(addressResolver.getAddress(systemSettingsName))
.issuanceRatio();
}
/*
* @notice Returns NAV contribution of SNX holdings in USD terms
*/
function getContractSnxValue() internal view returns (uint256) {
return getSnxBalance().mul(getSnxPrice()).div(DEC_18);
}
/* ========================================================================================= */
/* Burning sUSD */
/* ========================================================================================= */
/*
* @dev Calculates sUSD to burn to restore C-RATIO
* @param snxValueHeld: USD value of SNX
* @param contractDebtValue: USD value of sUSD debt
* @param issuanceRatio: Synthetix C-RATIO requirement
*/
function calculateSusdToBurnToFixRatio(
uint256 snxValueHeld,
uint256 contractDebtValue,
uint256 issuanceRatio
) internal pure returns (uint256) {
uint256 subtractor = issuanceRatio.mul(snxValueHeld).div(DEC_18);
if (subtractor > contractDebtValue) return 0;
return contractDebtValue.sub(subtractor);
}
/*
* @dev Calculates sUSD to burn to restore C-RATIO
*/
function calculateSusdToBurnToFixRatioExternal()
public
view
returns (uint256)
{
uint256 snxValueHeld = getContractSnxValue();
uint256 debtValue = getContractDebtValue();
uint256 issuanceRatio = getIssuanceRatio();
return
calculateSusdToBurnToFixRatio(
snxValueHeld,
debtValue,
issuanceRatio
);
}
/*
* @dev Calculates sUSD to burn to eclipse value of escrowed SNX
* @notice Synthetix system requires escrowed SNX to be "unlocked" first
* @param issuanceRatio: Synthetix C-RATIO requirement
*/
function calculateSusdToBurnToEclipseEscrowed(uint256 issuanceRatio)
public
view
returns (uint256)
{
uint256 escrowedSnxValue = getContractEscrowedSnxValue();
if (escrowedSnxValue == 0) return 0;
return escrowedSnxValue.mul(issuanceRatio).div(DEC_18);
}
/*
* @dev Helper function to calculate sUSD burn required for a potential redemption
* @param tokensToRedeem: potential tokens to burn
* @param totalSupply: xSNX.totalSupply()
* @param contractDebtValue: sUSD debt value
* @param issuanceRatio: Synthetix C-RATIO requirement
*/
function calculateSusdToBurnForRedemption(
uint256 tokensToRedeem,
uint256 totalSupply,
uint256 contractDebtValue,
uint256 issuanceRatio
) public view returns (uint256 susdToBurn) {
uint256 nonEscrowedSnxValue = getContractOwnedSnxValue();
uint256 lockedSnxValue = contractDebtValue.mul(DEC_18).div(
issuanceRatio
);
uint256 valueOfSnxToSell = nonEscrowedSnxValue.mul(tokensToRedeem).div(
totalSupply
);
susdToBurn = (
lockedSnxValue.add(valueOfSnxToSell).sub(nonEscrowedSnxValue)
)
.mul(issuanceRatio)
.div(DEC_18);
}
/* ========================================================================================= */
/* Rebalances */
/* ========================================================================================= */
/*
* @dev Helper function to facilitate xSNXAdmin.rebalanceTowardsHedge()
*/
function calculateAssetChangesForRebalanceToHedge()
internal
view
returns (uint256 totalSusdToBurn, uint256 snxToSell)
{
uint256 snxValueHeld = getContractSnxValue();
uint256 debtValueInUsd = getContractDebtValue();
uint256 issuanceRatio = getIssuanceRatio();
uint256 susdToBurnToFixRatio = calculateSusdToBurnToFixRatio(
snxValueHeld,
debtValueInUsd,
issuanceRatio
);
uint256 susdToBurnToEclipseEscrowed
= calculateSusdToBurnToEclipseEscrowed(issuanceRatio);
uint256 hedgeAssetsValueInUsd = calculateHedgeAssetsValueInUsd();
uint256 valueToUnlockInUsd = debtValueInUsd.sub(hedgeAssetsValueInUsd);
uint256 susdToBurnToUnlockTransfer = valueToUnlockInUsd
.mul(issuanceRatio)
.div(DEC_18);
totalSusdToBurn = (
susdToBurnToFixRatio.add(susdToBurnToEclipseEscrowed).add(
susdToBurnToUnlockTransfer
)
);
snxToSell = valueToUnlockInUsd.mul(DEC_18).div(getSnxPrice());
}
/*
* @dev Helper function to facilitate xSNXAdmin.rebalanceTowardsSnx()
*/
function calculateAssetChangesForRebalanceToSnx()
public
view
returns (uint256 setToSell)
{
(
uint256 debtValueInWei,
uint256 hedgeAssetsBalance
) = getRebalanceUtils();
uint256 setValueToSell = hedgeAssetsBalance.sub(debtValueInWei);
uint256 ethValueOfOneSet = calculateEthValueOfOneSetUnit();
setToSell = setValueToSell.mul(DEC_18).div(ethValueOfOneSet);
// Set quantity must be multiple of natural unit
uint256 naturalUnit = getSetNaturalUnit();
setToSell = setToSell.div(naturalUnit).mul(naturalUnit);
}
/*
* @dev Helper function to facilitate xSNXAdmin.rebalanceTowardsSnx()
*/
function getRebalanceTowardsSnxUtils()
public
view
returns (uint256 setToSell, address activeAsset)
{
setToSell = calculateAssetChangesForRebalanceToSnx();
activeAsset = getAssetCurrentlyActiveInSet();
}
/*
* @dev Helper function to facilitate xSNXAdmin.rebalanceTowardsSnx(), xSNXAdmin.rebalanceTowardsHedge()
* @dev Denominated in ETH terms
*/
function getRebalanceUtils()
public
view
returns (uint256 debtValueInWei, uint256 hedgeAssetsBalance)
{
uint256 setHoldingsInWei = getSetHoldingsValueInWei();
uint256 ethBalance = getEthBalance();
uint256 debtValue = getContractDebtValue();
debtValueInWei = calculateDebtValueInWei(debtValue);
hedgeAssetsBalance = setHoldingsInWei.add(ethBalance);
}
/*
* @dev Helper function to facilitate xSNXAdmin.rebalanceTowardsHedge()
* @dev Denominated in USD terms
*/
function calculateHedgeAssetsValueInUsd()
internal
view
returns (uint256 hedgeAssetsValueInUsd)
{
address currentSetAsset = getAssetCurrentlyActiveInSet();
uint256 decimals = (TEN**ERC20Detailed(currentSetAsset).decimals());
uint256 setCollateralTokens = getSetCollateralTokens();
setCollateralTokens = setCollateralTokens.mul(DEC_18).div(decimals);
bytes32 activeAssetSynthSymbol = getActiveAssetSynthSymbol();
uint256 synthUsd = getSynthPrice(activeAssetSynthSymbol);
uint256 setValueUsd = setCollateralTokens.mul(synthUsd).div(DEC_18);
uint256 ethBalance = getEthBalance();
uint256 ethUsd = getSynthPrice(seth);
uint256 ethValueUsd = ethBalance.mul(ethUsd).div(DEC_18);
hedgeAssetsValueInUsd = setValueUsd.add(ethValueUsd);
}
/*
* @dev Helper function to determine whether xSNXAdmin.rebalanceTowardsSnx() is required
*/
function isRebalanceTowardsSnxRequired() public view returns (bool) {
(
uint256 debtValueInWei,
uint256 hedgeAssetsBalance
) = getRebalanceUtils();
if (
debtValueInWei.mul(REBALANCE_THRESHOLD).div(PERCENT) <
hedgeAssetsBalance
) {
return true;
}
return false;
}
/*
* @dev Helper function to determine whether xSNXAdmin.rebalanceTowardsHedge() is required
*/
function isRebalanceTowardsHedgeRequired() public view returns (bool) {
(
uint256 debtValueInWei,
uint256 hedgeAssetsBalance
) = getRebalanceUtils();
if (
hedgeAssetsBalance.mul(REBALANCE_THRESHOLD).div(PERCENT) <
debtValueInWei
) {
return true;
}
return false;
}
/*
* @dev Helper function to facilitate xSNXAdmin.rebalanceTowardsHedge()
* @notice Will fail if !isRebalanceTowardsHedgeRequired()
*/
function getRebalanceTowardsHedgeUtils()
public
view
returns (
uint256,
uint256,
address
)
{
(
uint256 totalSusdToBurn,
uint256 snxToSell
) = calculateAssetChangesForRebalanceToHedge();
address activeAsset = getAssetCurrentlyActiveInSet();
return (totalSusdToBurn, snxToSell, activeAsset);
}
/*
* @dev Helper for `hedge` function
* @dev Determines share of sUSD to allocate to ETH
* @dev Implicitly determines Set allocation as well
* @param susdBal: sUSD balance post minting
*/
function getEthAllocationOnHedge(uint256 susdBal)
public
view
returns (uint256 ethAllocation)
{
uint256 ethUsd = getSynthPrice(seth);
uint256 setHoldingsInUsd = getSetHoldingsValueInWei().mul(ethUsd).div(
DEC_18
);
uint256 ethBalInUsd = getEthBalance().mul(ethUsd).div(DEC_18);
uint256 hedgeAssets = setHoldingsInUsd.add(ethBalInUsd);
if (ethBalInUsd.mul(ETH_TARGET) >= hedgeAssets.add(susdBal)) {
// full bal directed toward Set
// eth allocation is 0
} else if ((ethBalInUsd.add(susdBal)).mul(ETH_TARGET) < hedgeAssets) {
// full bal directed toward Eth
ethAllocation = susdBal;
} else {
// fractionate allocation
ethAllocation = ((hedgeAssets.add(susdBal)).div(ETH_TARGET)).sub(
ethBalInUsd
);
}
}
/*
* @dev Helper function to facilitate xSNXAdmin.rebalanceSetToEth()
*/
function calculateSetToSellForRebalanceSetToEth()
public
view
returns (uint256 setQuantityToSell)
{
uint256 setHoldingsInWei = getSetHoldingsValueInWei();
uint256 ethBal = getEthBalance();
uint256 hedgeAssets = setHoldingsInWei.add(ethBal);
require(
ethBal.mul(ETH_TARGET) < hedgeAssets,
"Rebalance not necessary"
);
uint256 ethToAdd = ((hedgeAssets.div(ETH_TARGET)).sub(ethBal));
setQuantityToSell = getContractSetBalance().mul(ethToAdd).div(
setHoldingsInWei
);
uint256 naturalUnit = getSetNaturalUnit();
setQuantityToSell = setQuantityToSell.div(naturalUnit).mul(naturalUnit);
}
/* ========================================================================================= */
/* Address Setters */
/* ========================================================================================= */
function setAdminInstanceAddress(address _xSNXAdminInstance)
public
onlyOwner
{
if (xSNXAdminInstance == address(0)) {
xSNXAdminInstance = _xSNXAdminInstance;
}
}
function setCurve(
address curvePoolAddress,
int128 _usdcIndex,
int128 _susdIndex
) public onlyOwner {
if (address(curveFi) == address(0)) {
// if initial set on deployment, immediately activate Curve address
curveFi = ICurveFi(curvePoolAddress);
nextCurveAddress = curvePoolAddress;
} else {
// if updating Curve address (i.e., not initial setting of address on deployment),
// store nextCurveAddress but don't activate until addressValidator has confirmed
nextCurveAddress = curvePoolAddress;
}
usdcIndex = _usdcIndex;
susdIndex = _susdIndex;
}
/* ========================================================================================= */
/* Utils */
/* ========================================================================================= */
// admin on deployment approve [snx, susd, setComponentA, setComponentB]
function approveKyber(address tokenAddress) public onlyOwner {
IERC20(tokenAddress).approve(address(kyberNetworkProxy), MAX_UINT);
}
// admin on deployment approve [susd, usdc]
function approveCurve(address tokenAddress) public onlyOwner {
IERC20(tokenAddress).approve(address(curveFi), MAX_UINT);
}
function confirmCurveAddress(address _nextCurveAddress) public {
require(msg.sender == addressValidator, "Incorrect caller");
require(nextCurveAddress == _nextCurveAddress, "Addresses don't match");
curveFi = ICurveFi(nextCurveAddress);
}
function() external payable {}
}
// File: contracts/helpers/Pausable.sol
pragma solidity ^0.5.15;
/* Adapted from OpenZeppelin */
contract Pausable is Initializable {
/**
* @dev Emitted when the pause is triggered by a pauser.
*/
event Paused();
/**
* @dev Emitted when the pause is lifted by a pauser.
*/
event Unpaused();
bool private _paused;
address public pauser;
/**
* @dev Initializes the contract in unpaused state. Assigns the Pauser role
* to the deployer.
*/
constructor () internal {
_paused = false;
pauser = msg.sender;
}
/**
* @dev Initializes the contract in unpaused state. Assigns the Pauser role
* to the deployer. This function is called when the contract is used in a upgradeable context.
*/
function initialize(address sender) public initializer {
_paused = false;
pauser = sender;
}
/**
* @dev Returns true if the contract is paused, and false otherwise.
*/
function paused() public view returns (bool) {
return _paused;
}
/**
* @dev Modifier to make a function callable only when the contract is not paused.
*/
modifier whenNotPaused() {
require(!_paused, "Pausable: paused");
_;
}
/**
* @dev Modifier to make a function callable only when the contract is paused.
*/
modifier whenPaused() {
require(_paused, "Pausable: not paused");
_;
}
/**
* @dev Called by a pauser to pause, triggers stopped state.
*/
function pause() public onlyPauser whenNotPaused {
_paused = true;
emit Paused();
}
/**
* @dev Called by a pauser to unpause, returns to normal state.
*/
function unpause() public onlyPauser whenPaused {
_paused = false;
emit Unpaused();
}
modifier onlyPauser {
require(msg.sender == pauser, "Don't have rights");
_;
}
}
// File: contracts/interface/IxSNXAdmin.sol
pragma solidity 0.5.15;
contract IxSNXAdmin {
function sendEthOnRedemption(uint valueToRedeem) external;
}
// File: contracts/xSNX.sol
pragma solidity 0.5.15;
contract xSNX is ERC20, ERC20Detailed, Pausable, Ownable {
TradeAccounting private tradeAccounting;
IKyberNetworkProxy private kyberNetworkProxy;
address xsnxAdmin;
address snxAddress;
address susdAddress;
uint256 public withdrawableEthFees;
function initialize(
address payable _tradeAccountingAddress,
address _kyberProxyAddress,
address _snxAddress,
address _susdAddress,
address _xsnxAdmin,
address _ownerAddress,
uint256 _mintFeeDivisor,
uint256 _burnFeeDivisor,
uint256 _claimFeeDivisor,
uint256 _initialMint
) public initializer {
Ownable.initialize(_ownerAddress);
ERC20Detailed.initialize("xSNX", "xSNXa", 18);
Pausable.initialize(_ownerAddress);
tradeAccounting = TradeAccounting(_tradeAccountingAddress);
kyberNetworkProxy = IKyberNetworkProxy(_kyberProxyAddress);
snxAddress = _snxAddress;
susdAddress = _susdAddress;
xsnxAdmin = _xsnxAdmin;
_setFeeDivisors(_mintFeeDivisor, _burnFeeDivisor, _claimFeeDivisor);
_mint(msg.sender, _initialMint);
}
event Mint(
address indexed user,
uint256 timestamp,
uint256 valueSent,
uint256 mintAmount,
bool mintWithEth
);
event Burn(
address indexed user,
uint256 timestamp,
uint256 burnAmount,
uint256 valueToSend
);
event WithdrawFees(
uint256 ethAmount,
uint256 susdAmount,
uint256 snxAmount
);
struct FeeDivisors {
uint256 mintFee;
uint256 burnFee;
uint256 claimFee;
}
FeeDivisors public feeDivisors;
// addresses are locked from transfer after minting or burning
uint256 private constant BLOCK_LOCK_COUNT = 6;
// last block for which this address is timelocked
mapping(address => uint256) public lastLockedBlock;
/*
* @notice Mint new xSNX tokens from the contract by sending ETH
* @dev Exchanges ETH for SNX
* @dev Min rate ETH/SNX sourced from Kyber in JS
* @dev: Calculates overall fund NAV in ETH terms, using ETH/SNX implicit conversion rate
* or ETH/SNX price (via SNX oracle) in case of allocateToEth
* @dev: Mints/distributes new xSNX tokens based on contribution to NAV
* @param: minRate: kyberProxy.getExpectedRate eth=>snx
*/
function mint(uint256 minRate) external payable whenNotPaused notLocked(msg.sender) {
require(msg.value > 0, "Must send ETH");
lock(msg.sender);
uint256 fee = calculateFee(msg.value, feeDivisors.mintFee);
uint256 ethContribution = msg.value.sub(fee);
uint256 snxBalanceBefore = tradeAccounting.getSnxBalance();
uint256 totalSupply = totalSupply();
(bool allocateToEth, uint256 nonSnxAssetValue) = tradeAccounting
.getMintWithEthUtils(totalSupply);
if (!allocateToEth) {
uint256 snxAcquired = kyberNetworkProxy.swapEtherToToken.value(
ethContribution
)(ERC20(snxAddress), minRate);
require(
IERC20(snxAddress).transfer(xsnxAdmin, snxAcquired),
"Transfer failed"
);
} else {
(bool success, ) = xsnxAdmin.call.value(ethContribution)("");
require(success, "Transfer failed");
}
uint256 mintAmount = tradeAccounting.calculateTokensToMintWithEth(
snxBalanceBefore,
ethContribution,
nonSnxAssetValue,
totalSupply
);
emit Mint(msg.sender, block.timestamp, msg.value, mintAmount, true);
return super._mint(msg.sender, mintAmount);
}
/*
* @notice Mint new xSNX tokens from the contract by sending SNX
* @notice Won't run without ERC20 approval
* @dev: Calculates overall fund NAV in ETH terms, using ETH/SNX price (via SNX oracle)
* @dev: Mints/distributes new xSNX tokens based on contribution to NAV
* @param: snxAmount: SNX to contribute
*/
function mintWithSnx(uint256 snxAmount) external whenNotPaused notLocked(msg.sender) {
require(snxAmount > 0, "Must send SNX");
lock(msg.sender);
uint256 snxBalanceBefore = tradeAccounting.getSnxBalance();
uint256 fee = calculateFee(snxAmount, feeDivisors.mintFee);
uint256 snxContribution = snxAmount.sub(fee);
require(
IERC20(snxAddress).transferFrom(msg.sender, address(this), fee),
"Transfer failed"
);
require(
IERC20(snxAddress).transferFrom(
msg.sender,
xsnxAdmin,
snxContribution
),
"Transfer failed"
);
uint256 mintAmount = tradeAccounting.calculateTokensToMintWithSnx(
snxBalanceBefore,
snxContribution,
totalSupply()
);
emit Mint(
msg.sender,
block.timestamp,
snxContribution,
mintAmount,
false
);
return super._mint(msg.sender, mintAmount);
}
/*
* @notice Redeems and burns xSNX tokens and sends ETH to user
* @dev Checks if ETH reserve is sufficient to settle redeem obligation
* @dev Will only redeem if ETH reserve is sufficient
* @param tokensToRedeem
*/
function burn(uint256 tokensToRedeem) external notLocked(msg.sender) {
require(tokensToRedeem > 0, "Must burn tokens");
lock(msg.sender);
uint256 valueToRedeem = tradeAccounting.calculateRedemptionValue(
totalSupply(),
tokensToRedeem
);
require(
tradeAccounting.getEthBalance() >= valueToRedeem,
"Redeem amount exceeds available liquidity"
);
IxSNXAdmin(xsnxAdmin).sendEthOnRedemption(valueToRedeem);
uint256 valueToSend = valueToRedeem.sub(
calculateFee(valueToRedeem, feeDivisors.burnFee)
);
super._burn(msg.sender, tokensToRedeem);
emit Burn(msg.sender, block.timestamp, tokensToRedeem, valueToSend);
(bool success, ) = msg.sender.call.value(valueToSend)("");
require(success, "Burn transfer failed");
}
function transfer(address recipient, uint256 amount)
public
notLocked(msg.sender)
returns (bool)
{
return super.transfer(recipient, amount);
}
function transferFrom(
address sender,
address recipient,
uint256 amount
) public notLocked(sender) returns (bool) {
return super.transferFrom(sender, recipient, amount);
}
function calculateFee(uint256 _value, uint256 _feeDivisor)
internal
pure
returns (uint256 fee)
{
if (_feeDivisor > 0) {
fee = _value.div(_feeDivisor);
}
}
/*
* @notice Inverse of fee i.e., a fee divisor of 100 == 1%
* @notice Three fee types
* @dev Mint fee 0 or <= 2%
* @dev Burn fee 0 or <= 1%
* @dev Claim fee 0 <= 4%
*/
function setFeeDivisors(
uint256 mintFeeDivisor,
uint256 burnFeeDivisor,
uint256 claimFeeDivisor
) public onlyOwner {
_setFeeDivisors(mintFeeDivisor, burnFeeDivisor, claimFeeDivisor);
}
function _setFeeDivisors(
uint256 _mintFeeDivisor,
uint256 _burnFeeDivisor,
uint256 _claimFeeDivisor
) private {
require(_mintFeeDivisor == 0 || _mintFeeDivisor >= 50, "Invalid fee");
require(_burnFeeDivisor == 0 || _burnFeeDivisor >= 100, "Invalid fee");
require(_claimFeeDivisor >= 25, "Invalid fee");
feeDivisors.mintFee = _mintFeeDivisor;
feeDivisors.burnFee = _burnFeeDivisor;
feeDivisors.claimFee = _claimFeeDivisor;
}
/*
* @notice Withdraws ETH, sUSD and SNX fees to owner address
*/
function withdrawFees() public onlyOwner {
uint256 ethFeesToWithdraw = address(this).balance;
uint256 susdFeesToWithdraw = IERC20(susdAddress).balanceOf(
address(this)
);
uint256 snxFeesToWithdraw = IERC20(snxAddress).balanceOf(address(this));
(bool success, ) = msg.sender.call.value(ethFeesToWithdraw)("");
require(success, "Transfer failed");
IERC20(susdAddress).transfer(msg.sender, susdFeesToWithdraw);
IERC20(snxAddress).transfer(msg.sender, snxFeesToWithdraw);
emit WithdrawFees(
ethFeesToWithdraw,
susdFeesToWithdraw,
snxFeesToWithdraw
);
}
/*
* @notice Emergency function in case of errant transfer of
* xSNX token directly to contract
*/
function withdrawNativeToken() public onlyOwner {
uint256 tokenBal = balanceOf(address(this));
if (tokenBal > 0) {
IERC20(address(this)).transfer(msg.sender, tokenBal);
}
}
/*
* @dev Helper function for xSNXAdmin to calculate and
* transfer claim fees
*/
function getClaimFeeDivisor() public view returns (uint256) {
return feeDivisors.claimFee;
}
/**
* BlockLock logic: Implements locking of mint, burn, transfer and transferFrom
* functions via a notLocked modifier.
* Functions are locked per address.
*/
modifier notLocked(address lockedAddress) {
require(
lastLockedBlock[lockedAddress] <= block.number,
"Function is temporarily locked for this address"
);
_;
}
/**
* @dev Lock mint, burn, transfer and transferFrom functions
* for _address for BLOCK_LOCK_COUNT blocks
*/
function lock(address _address) private {
lastLockedBlock[_address] = block.number + BLOCK_LOCK_COUNT;
}
function() external payable {
require(msg.sender == xsnxAdmin, "Invalid send");
}
}Contract Security Audit
- No Contract Security Audit Submitted- Submit Audit Here
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payable","name":"_tradeAccountingAddress","type":"address"},{"internalType":"address","name":"_kyberProxyAddress","type":"address"},{"internalType":"address","name":"_snxAddress","type":"address"},{"internalType":"address","name":"_susdAddress","type":"address"},{"internalType":"address","name":"_xsnxAdmin","type":"address"},{"internalType":"address","name":"_ownerAddress","type":"address"},{"internalType":"uint256","name":"_mintFeeDivisor","type":"uint256"},{"internalType":"uint256","name":"_burnFeeDivisor","type":"uint256"},{"internalType":"uint256","name":"_claimFeeDivisor","type":"uint256"},{"internalType":"uint256","name":"_initialMint","type":"uint256"}],"name":"initialize","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"sender","type":"address"}],"name":"initialize","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"isOwner","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"lastLockedBlock","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"minRate","type":"uint256"}],"name":"mint","outputs":[],"payable":true,"stateMutability":"payable","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"snxAmount","type":"uint256"}],"name":"mintWithSnx","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"pause","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"paused","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"pauser","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"renounceOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"mintFeeDivisor","type":"uint256"},{"internalType":"uint256","name":"burnFeeDivisor","type":"uint256"},{"internalType":"uint256","name":"claimFeeDivisor","type":"uint256"}],"name":"setFeeDivisors","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"sender","type":"address"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[],"name":"unpause","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[],"name":"withdrawFees","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[],"name":"withdrawNativeToken","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"withdrawableEthFees","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"}]Contract Creation Code
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Swarm Source
bzzr://1b55f4e85d25ec19534b6dce9285d84f0ee17accbec39864cf4ae689a3c46ae8
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Multichain Portfolio | 30 Chains
| Chain | Token | Portfolio % | Price | Amount | Value |
|---|
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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.