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Synthetix: Synth SNX contract has migrated to a new address.
Overview
ETH Balance
0 ETH
Eth Value
$0.00More Info
Private Name Tags
ContractCreator
TokenTracker
Latest 25 from a total of 503 transactions
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| Transfer | 11535541 | 1410 days ago | IN | 0 ETH | 0.00266027 | ||||
| Approve | 10387968 | 1587 days ago | IN | 0 ETH | 0.00133205 | ||||
| Approve | 10340884 | 1594 days ago | IN | 0 ETH | 0.00136649 | ||||
| Transfer | 10203310 | 1616 days ago | IN | 0 ETH | 0.00107982 | ||||
| Transfer | 10200834 | 1616 days ago | IN | 0 ETH | 0.00527215 | ||||
| Transfer | 10200492 | 1616 days ago | IN | 0 ETH | 0.00609133 | ||||
| Transfer | 10197750 | 1617 days ago | IN | 0 ETH | 0.00499384 | ||||
| Transfer | 10197346 | 1617 days ago | IN | 0 ETH | 0.00609203 | ||||
| Transfer | 10196313 | 1617 days ago | IN | 0 ETH | 0.00420092 | ||||
| Transfer | 10195720 | 1617 days ago | IN | 0 ETH | 0.00441046 | ||||
| Transfer | 10194827 | 1617 days ago | IN | 0 ETH | 0.00420092 | ||||
| Transfer | 10194271 | 1617 days ago | IN | 0 ETH | 0.00525115 | ||||
| Transfer | 10192196 | 1617 days ago | IN | 0 ETH | 0.00472657 | ||||
| Transfer | 10191543 | 1618 days ago | IN | 0 ETH | 0.00483161 | ||||
| Transfer | 10191361 | 1618 days ago | IN | 0 ETH | 0.00411582 | ||||
| Transfer | 10191336 | 1618 days ago | IN | 0 ETH | 0.00463149 | ||||
| Issue Max Synths... | 10190222 | 1618 days ago | IN | 0 ETH | 0.01974895 | ||||
| Issue Max Synths... | 10189889 | 1618 days ago | IN | 0 ETH | 0.02141306 | ||||
| Issue Max Synths... | 10189865 | 1618 days ago | IN | 0 ETH | 0.02111379 | ||||
| Issue Max Synths... | 10189858 | 1618 days ago | IN | 0 ETH | 0.02111379 | ||||
| Issue Max Synths... | 10189844 | 1618 days ago | IN | 0 ETH | 0.01986181 | ||||
| Burn Synths To T... | 10189811 | 1618 days ago | IN | 0 ETH | 0.0209286 | ||||
| Issue Max Synths... | 10189784 | 1618 days ago | IN | 0 ETH | 0.01986133 | ||||
| Issue Max Synths... | 10189762 | 1618 days ago | IN | 0 ETH | 0.01986157 | ||||
| Issue Max Synths... | 10189756 | 1618 days ago | IN | 0 ETH | 0.01969174 |
Advanced mode: Intended for advanced users or developers and will display all Internal Transactions including zero value transfers. Name tag integration is not available in advanced view.
Latest 25 internal transactions (View All)
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| 11535541 | 1410 days ago | 0 ETH | |||||
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| 10232738 | 1611 days ago | 0 ETH |
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Contract Name:
Synthetix
Compiler Version
v0.4.25+commit.59dbf8f1
Optimization Enabled:
Yes with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity)
/**
*Submitted for verification at Etherscan.io on 2020-03-31
*/
/*
⚠⚠⚠ WARNING WARNING WARNING ⚠⚠⚠
This is a TARGET contract - DO NOT CONNECT TO IT DIRECTLY IN YOUR CONTRACTS or DAPPS!
This contract has an associated PROXY that MUST be used for all integrations - this TARGET will be REPLACED in an upcoming Synthetix release!
The proxy for this contract can be found here:
https://contracts.synthetix.io/ProxyERC20
*//*
____ __ __ __ _
/ __/__ __ ___ / /_ / / ___ / /_ (_)__ __
_\ \ / // // _ \/ __// _ \/ -_)/ __// / \ \ /
/___/ \_, //_//_/\__//_//_/\__/ \__//_/ /_\_\
/___/
* Synthetix: Synthetix.sol
*
* Latest source (may be newer): https://github.com/Synthetixio/synthetix/blob/master/contracts/Synthetix.sol
* Docs: https://docs.synthetix.io/contracts/Synthetix
*
* Contract Dependencies:
* - ExternStateToken
* - MixinResolver
* - Owned
* - Proxyable
* - SelfDestructible
* - State
* Libraries:
* - Math
* - SafeDecimalMath
* - SafeMath
*
* MIT License
* ===========
*
* Copyright (c) 2020 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
*/
/* ===============================================
* Flattened with Solidifier by Coinage
*
* https://solidifier.coina.ge
* ===============================================
*/
pragma solidity ^0.4.24;
/**
* @title SafeMath
* @dev Math operations with safety checks that revert on error
*/
library SafeMath {
/**
* @dev Multiplies two numbers, reverts on 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);
return c;
}
/**
* @dev Integer division of two numbers truncating the quotient, reverts on division by zero.
*/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
require(b > 0); // Solidity only automatically asserts when dividing by 0
uint256 c = a / b;
// assert(a == b * c + a % b); // There is no case in which this doesn't hold
return c;
}
/**
* @dev Subtracts two numbers, reverts on overflow (i.e. if subtrahend is greater than minuend).
*/
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
require(b <= a);
uint256 c = a - b;
return c;
}
/**
* @dev Adds two numbers, reverts on overflow.
*/
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
require(c >= a);
return c;
}
/**
* @dev Divides two numbers and returns the remainder (unsigned integer modulo),
* reverts when dividing by zero.
*/
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
require(b != 0);
return a % b;
}
}
// https://docs.synthetix.io/contracts/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;
}
}
// https://docs.synthetix.io/contracts/Owned
contract Owned {
address public owner;
address public nominatedOwner;
/**
* @dev Owned Constructor
*/
constructor(address _owner) public {
require(_owner != address(0), "Owner address cannot be 0");
owner = _owner;
emit OwnerChanged(address(0), _owner);
}
/**
* @notice Nominate a new owner of this contract.
* @dev Only the current owner may nominate a new owner.
*/
function nominateNewOwner(address _owner) external onlyOwner {
nominatedOwner = _owner;
emit OwnerNominated(_owner);
}
/**
* @notice Accept the nomination to be 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 {
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/SelfDestructible
contract SelfDestructible is Owned {
uint public initiationTime;
bool public selfDestructInitiated;
address public selfDestructBeneficiary;
uint public constant SELFDESTRUCT_DELAY = 4 weeks;
/**
* @dev Constructor
* @param _owner The account which controls this contract.
*/
constructor(address _owner) public Owned(_owner) {
require(_owner != address(0), "Owner must not be zero");
selfDestructBeneficiary = _owner;
emit SelfDestructBeneficiaryUpdated(_owner);
}
/**
* @notice Set the beneficiary address of this contract.
* @dev Only the contract owner may call this. The provided beneficiary must be non-null.
* @param _beneficiary The address to pay any eth contained in this contract to upon self-destruction.
*/
function setSelfDestructBeneficiary(address _beneficiary) external onlyOwner {
require(_beneficiary != address(0), "Beneficiary must not be zero");
selfDestructBeneficiary = _beneficiary;
emit SelfDestructBeneficiaryUpdated(_beneficiary);
}
/**
* @notice Begin the self-destruction counter of this contract.
* Once the delay has elapsed, the contract may be self-destructed.
* @dev Only the contract owner may call this.
*/
function initiateSelfDestruct() external onlyOwner {
initiationTime = now;
selfDestructInitiated = true;
emit SelfDestructInitiated(SELFDESTRUCT_DELAY);
}
/**
* @notice Terminate and reset the self-destruction timer.
* @dev Only the contract owner may call this.
*/
function terminateSelfDestruct() external onlyOwner {
initiationTime = 0;
selfDestructInitiated = false;
emit SelfDestructTerminated();
}
/**
* @notice If the self-destruction delay has elapsed, destroy this contract and
* remit any ether it owns to the beneficiary address.
* @dev Only the contract owner may call this.
*/
function selfDestruct() external onlyOwner {
require(selfDestructInitiated, "Self Destruct not yet initiated");
require(initiationTime + SELFDESTRUCT_DELAY < now, "Self destruct delay not met");
address beneficiary = selfDestructBeneficiary;
emit SelfDestructed(beneficiary);
selfdestruct(beneficiary);
}
event SelfDestructTerminated();
event SelfDestructed(address beneficiary);
event SelfDestructInitiated(uint selfDestructDelay);
event SelfDestructBeneficiaryUpdated(address newBeneficiary);
}
// https://docs.synthetix.io/contracts/State
contract State is Owned {
// the address of the contract that can modify variables
// this can only be changed by the owner of this contract
address public associatedContract;
constructor(address _owner, address _associatedContract) public Owned(_owner) {
associatedContract = _associatedContract;
emit AssociatedContractUpdated(_associatedContract);
}
/* ========== SETTERS ========== */
// Change the associated contract to a new address
function setAssociatedContract(address _associatedContract) external onlyOwner {
associatedContract = _associatedContract;
emit AssociatedContractUpdated(_associatedContract);
}
/* ========== MODIFIERS ========== */
modifier onlyAssociatedContract {
require(msg.sender == associatedContract, "Only the associated contract can perform this action");
_;
}
/* ========== EVENTS ========== */
event AssociatedContractUpdated(address associatedContract);
}
// https://docs.synthetix.io/contracts/TokenState
contract TokenState is State {
/* ERC20 fields. */
mapping(address => uint) public balanceOf;
mapping(address => mapping(address => uint)) public allowance;
/**
* @dev Constructor
* @param _owner The address which controls this contract.
* @param _associatedContract The ERC20 contract whose state this composes.
*/
constructor(address _owner, address _associatedContract) public State(_owner, _associatedContract) {}
/* ========== SETTERS ========== */
/**
* @notice Set ERC20 allowance.
* @dev Only the associated contract may call this.
* @param tokenOwner The authorising party.
* @param spender The authorised party.
* @param value The total value the authorised party may spend on the
* authorising party's behalf.
*/
function setAllowance(address tokenOwner, address spender, uint value) external onlyAssociatedContract {
allowance[tokenOwner][spender] = value;
}
/**
* @notice Set the balance in a given account
* @dev Only the associated contract may call this.
* @param account The account whose value to set.
* @param value The new balance of the given account.
*/
function setBalanceOf(address account, uint value) external onlyAssociatedContract {
balanceOf[account] = value;
}
}
// https://docs.synthetix.io/contracts/Proxy
contract Proxy is Owned {
Proxyable public target;
bool public useDELEGATECALL;
constructor(address _owner) public Owned(_owner) {}
function setTarget(Proxyable _target) external onlyOwner {
target = _target;
emit TargetUpdated(_target);
}
function setUseDELEGATECALL(bool value) external onlyOwner {
useDELEGATECALL = value;
}
function _emit(bytes callData, uint numTopics, bytes32 topic1, bytes32 topic2, bytes32 topic3, bytes32 topic4)
external
onlyTarget
{
uint size = callData.length;
bytes memory _callData = callData;
assembly {
/* The first 32 bytes of callData contain its length (as specified by the abi).
* Length is assumed to be a uint256 and therefore maximum of 32 bytes
* in length. It is also leftpadded to be a multiple of 32 bytes.
* This means moving call_data across 32 bytes guarantees we correctly access
* the data itself. */
switch numTopics
case 0 {
log0(add(_callData, 32), size)
}
case 1 {
log1(add(_callData, 32), size, topic1)
}
case 2 {
log2(add(_callData, 32), size, topic1, topic2)
}
case 3 {
log3(add(_callData, 32), size, topic1, topic2, topic3)
}
case 4 {
log4(add(_callData, 32), size, topic1, topic2, topic3, topic4)
}
}
}
function() external payable {
if (useDELEGATECALL) {
assembly {
/* Copy call data into free memory region. */
let free_ptr := mload(0x40)
calldatacopy(free_ptr, 0, calldatasize)
/* Forward all gas and call data to the target contract. */
let result := delegatecall(gas, sload(target_slot), free_ptr, calldatasize, 0, 0)
returndatacopy(free_ptr, 0, returndatasize)
/* Revert if the call failed, otherwise return the result. */
if iszero(result) {
revert(free_ptr, returndatasize)
}
return(free_ptr, returndatasize)
}
} else {
/* Here we are as above, but must send the messageSender explicitly
* since we are using CALL rather than DELEGATECALL. */
target.setMessageSender(msg.sender);
assembly {
let free_ptr := mload(0x40)
calldatacopy(free_ptr, 0, calldatasize)
/* We must explicitly forward ether to the underlying contract as well. */
let result := call(gas, sload(target_slot), callvalue, free_ptr, calldatasize, 0, 0)
returndatacopy(free_ptr, 0, returndatasize)
if iszero(result) {
revert(free_ptr, returndatasize)
}
return(free_ptr, returndatasize)
}
}
}
modifier onlyTarget {
require(Proxyable(msg.sender) == target, "Must be proxy target");
_;
}
event TargetUpdated(Proxyable newTarget);
}
// https://docs.synthetix.io/contracts/Proxyable
contract Proxyable is Owned {
// This contract should be treated like an abstract contract
/* The proxy this contract exists behind. */
Proxy public proxy;
Proxy public integrationProxy;
/* The caller of the proxy, passed through to this contract.
* Note that every function using this member must apply the onlyProxy or
* optionalProxy modifiers, otherwise their invocations can use stale values. */
address public messageSender;
constructor(address _proxy, address _owner) public Owned(_owner) {
proxy = Proxy(_proxy);
emit ProxyUpdated(_proxy);
}
function setProxy(address _proxy) external onlyOwner {
proxy = Proxy(_proxy);
emit ProxyUpdated(_proxy);
}
function setIntegrationProxy(address _integrationProxy) external onlyOwner {
integrationProxy = Proxy(_integrationProxy);
}
function setMessageSender(address sender) external onlyProxy {
messageSender = sender;
}
modifier onlyProxy {
require(Proxy(msg.sender) == proxy || Proxy(msg.sender) == integrationProxy, "Only the proxy can call");
_;
}
modifier optionalProxy {
if (Proxy(msg.sender) != proxy && Proxy(msg.sender) != integrationProxy && messageSender != msg.sender) {
messageSender = msg.sender;
}
_;
}
modifier optionalProxy_onlyOwner {
if (Proxy(msg.sender) != proxy && Proxy(msg.sender) != integrationProxy && messageSender != msg.sender) {
messageSender = msg.sender;
}
require(messageSender == owner, "Owner only function");
_;
}
event ProxyUpdated(address proxyAddress);
}
// https://docs.synthetix.io/contracts/ExternStateToken
contract ExternStateToken is SelfDestructible, Proxyable {
using SafeMath for uint;
using SafeDecimalMath for uint;
/* ========== STATE VARIABLES ========== */
/* Stores balances and allowances. */
TokenState public tokenState;
/* Other ERC20 fields. */
string public name;
string public symbol;
uint public totalSupply;
uint8 public decimals;
/**
* @dev Constructor.
* @param _proxy The proxy associated with this contract.
* @param _name Token's ERC20 name.
* @param _symbol Token's ERC20 symbol.
* @param _totalSupply The total supply of the token.
* @param _tokenState The TokenState contract address.
* @param _owner The owner of this contract.
*/
constructor(
address _proxy,
TokenState _tokenState,
string _name,
string _symbol,
uint _totalSupply,
uint8 _decimals,
address _owner
) public SelfDestructible(_owner) Proxyable(_proxy, _owner) {
tokenState = _tokenState;
name = _name;
symbol = _symbol;
totalSupply = _totalSupply;
decimals = _decimals;
}
/* ========== VIEWS ========== */
/**
* @notice Returns the ERC20 allowance of one party to spend on behalf of another.
* @param owner The party authorising spending of their funds.
* @param spender The party spending tokenOwner's funds.
*/
function allowance(address owner, address spender) public view returns (uint) {
return tokenState.allowance(owner, spender);
}
/**
* @notice Returns the ERC20 token balance of a given account.
*/
function balanceOf(address account) public view returns (uint) {
return tokenState.balanceOf(account);
}
/* ========== MUTATIVE FUNCTIONS ========== */
/**
* @notice Set the address of the TokenState contract.
* @dev This can be used to "pause" transfer functionality, by pointing the tokenState at 0x000..
* as balances would be unreachable.
*/
function setTokenState(TokenState _tokenState) external optionalProxy_onlyOwner {
tokenState = _tokenState;
emitTokenStateUpdated(_tokenState);
}
function _internalTransfer(address from, address to, uint value) internal returns (bool) {
/* Disallow transfers to irretrievable-addresses. */
require(to != address(0) && to != address(this) && to != address(proxy), "Cannot transfer to this address");
// Insufficient balance will be handled by the safe subtraction.
tokenState.setBalanceOf(from, tokenState.balanceOf(from).sub(value));
tokenState.setBalanceOf(to, tokenState.balanceOf(to).add(value));
// Emit a standard ERC20 transfer event
emitTransfer(from, to, value);
return true;
}
/**
* @dev Perform an ERC20 token transfer. Designed to be called by transfer functions possessing
* the onlyProxy or optionalProxy modifiers.
*/
function _transfer_byProxy(address from, address to, uint value) internal returns (bool) {
return _internalTransfer(from, to, value);
}
/**
* @dev Perform an ERC20 token transferFrom. Designed to be called by transferFrom functions
* possessing the optionalProxy or optionalProxy modifiers.
*/
function _transferFrom_byProxy(address sender, address from, address to, uint value) internal returns (bool) {
/* Insufficient allowance will be handled by the safe subtraction. */
tokenState.setAllowance(from, sender, tokenState.allowance(from, sender).sub(value));
return _internalTransfer(from, to, value);
}
/**
* @notice Approves spender to transfer on the message sender's behalf.
*/
function approve(address spender, uint value) public optionalProxy returns (bool) {
address sender = messageSender;
tokenState.setAllowance(sender, spender, value);
emitApproval(sender, spender, value);
return true;
}
/* ========== EVENTS ========== */
event Transfer(address indexed from, address indexed to, uint value);
bytes32 constant TRANSFER_SIG = keccak256("Transfer(address,address,uint256)");
function emitTransfer(address from, address to, uint value) internal {
proxy._emit(abi.encode(value), 3, TRANSFER_SIG, bytes32(from), bytes32(to), 0);
}
event Approval(address indexed owner, address indexed spender, uint value);
bytes32 constant APPROVAL_SIG = keccak256("Approval(address,address,uint256)");
function emitApproval(address owner, address spender, uint value) internal {
proxy._emit(abi.encode(value), 3, APPROVAL_SIG, bytes32(owner), bytes32(spender), 0);
}
event TokenStateUpdated(address newTokenState);
bytes32 constant TOKENSTATEUPDATED_SIG = keccak256("TokenStateUpdated(address)");
function emitTokenStateUpdated(address newTokenState) internal {
proxy._emit(abi.encode(newTokenState), 1, TOKENSTATEUPDATED_SIG, 0, 0, 0);
}
}
// https://docs.synthetix.io/contracts/AddressResolver
contract AddressResolver is Owned {
mapping(bytes32 => address) public repository;
constructor(address _owner) public Owned(_owner) {}
/* ========== MUTATIVE FUNCTIONS ========== */
function importAddresses(bytes32[] names, address[] destinations) public onlyOwner {
require(names.length == destinations.length, "Input lengths must match");
for (uint i = 0; i < names.length; i++) {
repository[names[i]] = destinations[i];
}
}
/* ========== VIEWS ========== */
function getAddress(bytes32 name) public view returns (address) {
return repository[name];
}
function requireAndGetAddress(bytes32 name, string reason) public view returns (address) {
address _foundAddress = repository[name];
require(_foundAddress != address(0), reason);
return _foundAddress;
}
}
// https://docs.synthetix.io/contracts/MixinResolver
contract MixinResolver is Owned {
AddressResolver public resolver;
mapping(bytes32 => address) private addressCache;
bytes32[] public resolverAddressesRequired;
uint public constant MAX_ADDRESSES_FROM_RESOLVER = 24;
constructor(address _owner, address _resolver, bytes32[MAX_ADDRESSES_FROM_RESOLVER] _addressesToCache)
public
Owned(_owner)
{
for (uint i = 0; i < _addressesToCache.length; i++) {
if (_addressesToCache[i] != bytes32(0)) {
resolverAddressesRequired.push(_addressesToCache[i]);
} else {
// End early once an empty item is found - assumes there are no empty slots in
// _addressesToCache
break;
}
}
resolver = AddressResolver(_resolver);
// Do not sync the cache as addresses may not be in the resolver yet
}
/* ========== SETTERS ========== */
function setResolverAndSyncCache(AddressResolver _resolver) external onlyOwner {
resolver = _resolver;
for (uint i = 0; i < resolverAddressesRequired.length; i++) {
bytes32 name = resolverAddressesRequired[i];
// Note: can only be invoked once the resolver has all the targets needed added
addressCache[name] = resolver.requireAndGetAddress(name, "Resolver missing target");
}
}
/* ========== VIEWS ========== */
function requireAndGetAddress(bytes32 name, string reason) internal view returns (address) {
address _foundAddress = addressCache[name];
require(_foundAddress != address(0), reason);
return _foundAddress;
}
// Note: this could be made external in a utility contract if addressCache was made public
// (used for deployment)
function isResolverCached(AddressResolver _resolver) external view returns (bool) {
if (resolver != _resolver) {
return false;
}
// otherwise, check everything
for (uint i = 0; i < resolverAddressesRequired.length; i++) {
bytes32 name = resolverAddressesRequired[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;
}
// Note: can be made external into a utility contract (used for deployment)
function getResolverAddressesRequired() external view returns (bytes32[MAX_ADDRESSES_FROM_RESOLVER] addressesRequired) {
for (uint i = 0; i < resolverAddressesRequired.length; i++) {
addressesRequired[i] = resolverAddressesRequired[i];
}
}
/* ========== INTERNAL FUNCTIONS ========== */
function appendToAddressCache(bytes32 name) internal {
resolverAddressesRequired.push(name);
require(resolverAddressesRequired.length < MAX_ADDRESSES_FROM_RESOLVER, "Max resolver cache size met");
// Because this is designed to be called internally in constructors, we don't
// check the address exists already in the resolver
addressCache[name] = resolver.getAddress(name);
}
}
// https://docs.synthetix.io/contracts/Math
library Math {
using SafeMath for uint;
using SafeDecimalMath for uint;
/**
* @dev Uses "exponentiation by squaring" algorithm where cost is 0(logN)
* vs 0(N) for naive repeated multiplication.
* Calculates x^n with x as fixed-point and n as regular unsigned int.
* Calculates to 18 digits of precision with SafeDecimalMath.unit()
*/
function powDecimal(uint x, uint n) internal pure returns (uint) {
// https://mpark.github.io/programming/2014/08/18/exponentiation-by-squaring/
uint result = SafeDecimalMath.unit();
while (n > 0) {
if (n % 2 != 0) {
result = result.multiplyDecimal(x);
}
x = x.multiplyDecimal(x);
n /= 2;
}
return result;
}
}
/**
* @title SynthetixState interface contract
* @notice Abstract contract to hold public getters
*/
contract ISynthetixState {
// A struct for handing values associated with an individual user's debt position
struct IssuanceData {
// Percentage of the total debt owned at the time
// of issuance. This number is modified by the global debt
// delta array. You can figure out a user's exit price and
// collateralisation ratio using a combination of their initial
// debt and the slice of global debt delta which applies to them.
uint initialDebtOwnership;
// This lets us know when (in relative terms) the user entered
// the debt pool so we can calculate their exit price and
// collateralistion ratio
uint debtEntryIndex;
}
uint[] public debtLedger;
uint public issuanceRatio;
mapping(address => IssuanceData) public issuanceData;
function debtLedgerLength() external view returns (uint);
function hasIssued(address account) external view returns (bool);
function incrementTotalIssuerCount() external;
function decrementTotalIssuerCount() external;
function setCurrentIssuanceData(address account, uint initialDebtOwnership) external;
function lastDebtLedgerEntry() external view returns (uint);
function appendDebtLedgerValue(uint value) external;
function clearIssuanceData(address account) external;
}
interface ISynth {
function burn(address account, uint amount) external;
function issue(address account, uint amount) external;
function transfer(address to, uint value) external returns (bool);
function transferFrom(address from, address to, uint value) external returns (bool);
function transferFromAndSettle(address from, address to, uint value) external returns (bool);
function balanceOf(address owner) external view returns (uint);
}
/**
* @title SynthetixEscrow interface
*/
interface ISynthetixEscrow {
function balanceOf(address account) public view returns (uint);
function appendVestingEntry(address account, uint quantity) public;
}
/**
* @title FeePool Interface
* @notice Abstract contract to hold public getters
*/
contract IFeePool {
address public FEE_ADDRESS;
uint public exchangeFeeRate;
function amountReceivedFromExchange(uint value) external view returns (uint);
function amountReceivedFromTransfer(uint value) external view returns (uint);
function recordFeePaid(uint sUSDAmount) external;
function appendAccountIssuanceRecord(address account, uint lockedAmount, uint debtEntryIndex) external;
function setRewardsToDistribute(uint amount) external;
}
/**
* @title ExchangeRates interface
*/
interface IExchangeRates {
function effectiveValue(bytes32 sourceCurrencyKey, uint sourceAmount, bytes32 destinationCurrencyKey)
external
view
returns (uint);
function rateForCurrency(bytes32 currencyKey) external view returns (uint);
function ratesForCurrencies(bytes32[] currencyKeys) external view returns (uint[] memory);
function rateIsStale(bytes32 currencyKey) external view returns (bool);
function rateIsFrozen(bytes32 currencyKey) external view returns (bool);
function anyRateIsStale(bytes32[] currencyKeys) external view returns (bool);
function getCurrentRoundId(bytes32 currencyKey) external view returns (uint);
function effectiveValueAtRound(
bytes32 sourceCurrencyKey,
uint sourceAmount,
bytes32 destinationCurrencyKey,
uint roundIdForSrc,
uint roundIdForDest
) external view returns (uint);
function getLastRoundIdBeforeElapsedSecs(
bytes32 currencyKey,
uint startingRoundId,
uint startingTimestamp,
uint timediff
) external view returns (uint);
function ratesAndStaleForCurrencies(bytes32[] currencyKeys) external view returns (uint[], bool);
function rateAndTimestampAtRound(bytes32 currencyKey, uint roundId) external view returns (uint rate, uint time);
}
interface ISystemStatus {
function requireSystemActive() external view;
function requireIssuanceActive() external view;
function requireExchangeActive() external view;
function requireSynthActive(bytes32 currencyKey) external view;
function requireSynthsActive(bytes32 sourceCurrencyKey, bytes32 destinationCurrencyKey) external view;
}
interface IExchanger {
function maxSecsLeftInWaitingPeriod(address account, bytes32 currencyKey) external view returns (uint);
function feeRateForExchange(bytes32 sourceCurrencyKey, bytes32 destinationCurrencyKey) external view returns (uint);
function settlementOwing(address account, bytes32 currencyKey)
external
view
returns (uint reclaimAmount, uint rebateAmount, uint numEntries);
function settle(address from, bytes32 currencyKey) external returns (uint reclaimed, uint refunded, uint numEntries);
function exchange(
address from,
bytes32 sourceCurrencyKey,
uint sourceAmount,
bytes32 destinationCurrencyKey,
address destinationAddress
) external returns (uint amountReceived);
function exchangeOnBehalf(
address exchangeForAddress,
address from,
bytes32 sourceCurrencyKey,
uint sourceAmount,
bytes32 destinationCurrencyKey
) external returns (uint amountReceived);
function calculateAmountAfterSettlement(address from, bytes32 currencyKey, uint amount, uint refunded)
external
view
returns (uint amountAfterSettlement);
}
interface IIssuer {
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 canBurnSynths(address account) external view returns (bool);
function lastIssueEvent(address account) external view returns (uint);
}
// https://docs.synthetix.io/contracts/Synth
contract Synth is ExternStateToken, MixinResolver {
/* ========== STATE VARIABLES ========== */
// Currency key which identifies this Synth to the Synthetix system
bytes32 public currencyKey;
uint8 public constant DECIMALS = 18;
// Where fees are pooled in sUSD
address public constant FEE_ADDRESS = 0xfeEFEEfeefEeFeefEEFEEfEeFeefEEFeeFEEFEeF;
/* ========== ADDRESS RESOLVER CONFIGURATION ========== */
bytes32 private constant CONTRACT_SYSTEMSTATUS = "SystemStatus";
bytes32 private constant CONTRACT_SYNTHETIX = "Synthetix";
bytes32 private constant CONTRACT_EXCHANGER = "Exchanger";
bytes32 private constant CONTRACT_ISSUER = "Issuer";
bytes32 private constant CONTRACT_FEEPOOL = "FeePool";
bytes32[24] internal addressesToCache = [
CONTRACT_SYSTEMSTATUS,
CONTRACT_SYNTHETIX,
CONTRACT_EXCHANGER,
CONTRACT_ISSUER,
CONTRACT_FEEPOOL
];
/* ========== CONSTRUCTOR ========== */
constructor(
address _proxy,
TokenState _tokenState,
string _tokenName,
string _tokenSymbol,
address _owner,
bytes32 _currencyKey,
uint _totalSupply,
address _resolver
)
public
ExternStateToken(_proxy, _tokenState, _tokenName, _tokenSymbol, _totalSupply, DECIMALS, _owner)
MixinResolver(_owner, _resolver, addressesToCache)
{
require(_proxy != address(0), "_proxy cannot be 0");
require(_owner != 0, "_owner cannot be 0");
currencyKey = _currencyKey;
}
/* ========== MUTATIVE FUNCTIONS ========== */
function transfer(address to, uint value) public optionalProxy returns (bool) {
_ensureCanTransfer(messageSender, value);
// transfers to FEE_ADDRESS will be exchanged into sUSD and recorded as fee
if (to == FEE_ADDRESS) {
return _transferToFeeAddress(to, value);
}
// transfers to 0x address will be burned
if (to == address(0)) {
return _internalBurn(messageSender, value);
}
return super._internalTransfer(messageSender, to, value);
}
function transferAndSettle(address to, uint value) public optionalProxy returns (bool) {
systemStatus().requireSynthActive(currencyKey);
(, , uint numEntriesSettled) = exchanger().settle(messageSender, currencyKey);
// Save gas instead of calling transferableSynths
uint balanceAfter = value;
if (numEntriesSettled > 0) {
balanceAfter = tokenState.balanceOf(messageSender);
}
// Reduce the value to transfer if balance is insufficient after reclaimed
value = value > balanceAfter ? balanceAfter : value;
return super._internalTransfer(messageSender, to, value);
}
function transferFrom(address from, address to, uint value) public optionalProxy returns (bool) {
_ensureCanTransfer(from, value);
return _internalTransferFrom(from, to, value);
}
function transferFromAndSettle(address from, address to, uint value) public optionalProxy returns (bool) {
systemStatus().requireSynthActive(currencyKey);
(, , uint numEntriesSettled) = exchanger().settle(from, currencyKey);
// Save gas instead of calling transferableSynths
uint balanceAfter = value;
if (numEntriesSettled > 0) {
balanceAfter = tokenState.balanceOf(from);
}
// Reduce the value to transfer if balance is insufficient after reclaimed
value = value >= balanceAfter ? balanceAfter : value;
return _internalTransferFrom(from, to, value);
}
/**
* @notice _transferToFeeAddress function
* non-sUSD synths are exchanged into sUSD via synthInitiatedExchange
* notify feePool to record amount as fee paid to feePool */
function _transferToFeeAddress(address to, uint value) internal returns (bool) {
uint amountInUSD;
// sUSD can be transferred to FEE_ADDRESS directly
if (currencyKey == "sUSD") {
amountInUSD = value;
super._internalTransfer(messageSender, to, value);
} else {
// else exchange synth into sUSD and send to FEE_ADDRESS
amountInUSD = exchanger().exchange(messageSender, currencyKey, value, "sUSD", FEE_ADDRESS);
}
// Notify feePool to record sUSD to distribute as fees
feePool().recordFeePaid(amountInUSD);
return true;
}
// Allow synthetix to issue a certain number of synths from an account.
// forward call to _internalIssue
function issue(address account, uint amount) external onlyInternalContracts {
_internalIssue(account, amount);
}
// Allow synthetix or another synth contract to burn a certain number of synths from an account.
// forward call to _internalBurn
function burn(address account, uint amount) external onlyInternalContracts {
_internalBurn(account, amount);
}
function _internalIssue(address account, uint amount) internal {
tokenState.setBalanceOf(account, tokenState.balanceOf(account).add(amount));
totalSupply = totalSupply.add(amount);
emitTransfer(address(0), account, amount);
emitIssued(account, amount);
}
function _internalBurn(address account, uint amount) internal returns (bool) {
tokenState.setBalanceOf(account, tokenState.balanceOf(account).sub(amount));
totalSupply = totalSupply.sub(amount);
emitTransfer(account, address(0), amount);
emitBurned(account, amount);
return true;
}
// Allow owner to set the total supply on import.
function setTotalSupply(uint amount) external optionalProxy_onlyOwner {
totalSupply = amount;
}
/* ========== VIEWS ========== */
function systemStatus() internal view returns (ISystemStatus) {
return ISystemStatus(requireAndGetAddress(CONTRACT_SYSTEMSTATUS, "Missing SystemStatus address"));
}
function synthetix() internal view returns (ISynthetix) {
return ISynthetix(requireAndGetAddress(CONTRACT_SYNTHETIX, "Missing Synthetix address"));
}
function feePool() internal view returns (IFeePool) {
return IFeePool(requireAndGetAddress(CONTRACT_FEEPOOL, "Missing FeePool address"));
}
function exchanger() internal view returns (IExchanger) {
return IExchanger(requireAndGetAddress(CONTRACT_EXCHANGER, "Missing Exchanger address"));
}
function issuer() internal view returns (IIssuer) {
return IIssuer(requireAndGetAddress(CONTRACT_ISSUER, "Missing Issuer address"));
}
function _ensureCanTransfer(address from, uint value) internal view {
require(exchanger().maxSecsLeftInWaitingPeriod(from, currencyKey) == 0, "Cannot transfer during waiting period");
require(transferableSynths(from) >= value, "Insufficient balance after any settlement owing");
systemStatus().requireSynthActive(currencyKey);
}
function transferableSynths(address account) public view returns (uint) {
(uint reclaimAmount, , ) = exchanger().settlementOwing(account, currencyKey);
// Note: ignoring rebate amount here because a settle() is required in order to
// allow the transfer to actually work
uint balance = tokenState.balanceOf(account);
if (reclaimAmount > balance) {
return 0;
} else {
return balance.sub(reclaimAmount);
}
}
/* ========== INTERNAL FUNCTIONS ========== */
function _internalTransferFrom(address from, address to, uint value) internal returns (bool) {
// Skip allowance update in case of infinite allowance
if (tokenState.allowance(from, messageSender) != uint(-1)) {
// Reduce the allowance by the amount we're transferring.
// The safeSub call will handle an insufficient allowance.
tokenState.setAllowance(from, messageSender, tokenState.allowance(from, messageSender).sub(value));
}
return super._internalTransfer(from, to, value);
}
/* ========== MODIFIERS ========== */
modifier onlyInternalContracts() {
bool isSynthetix = msg.sender == address(synthetix());
bool isFeePool = msg.sender == address(feePool());
bool isExchanger = msg.sender == address(exchanger());
bool isIssuer = msg.sender == address(issuer());
require(
isSynthetix || isFeePool || isExchanger || isIssuer,
"Only Synthetix, FeePool, Exchanger or Issuer contracts allowed"
);
_;
}
/* ========== EVENTS ========== */
event Issued(address indexed account, uint value);
bytes32 private constant ISSUED_SIG = keccak256("Issued(address,uint256)");
function emitIssued(address account, uint value) internal {
proxy._emit(abi.encode(value), 2, ISSUED_SIG, bytes32(account), 0, 0);
}
event Burned(address indexed account, uint value);
bytes32 private constant BURNED_SIG = keccak256("Burned(address,uint256)");
function emitBurned(address account, uint value) internal {
proxy._emit(abi.encode(value), 2, BURNED_SIG, bytes32(account), 0, 0);
}
}
/**
* @title Synthetix interface contract
* @notice Abstract contract to hold public getters
* @dev pseudo interface, actually declared as contract to hold the public getters
*/
contract ISynthetix {
// ========== PUBLIC STATE VARIABLES ==========
uint public totalSupply;
mapping(bytes32 => Synth) public synths;
mapping(address => bytes32) public synthsByAddress;
// ========== PUBLIC FUNCTIONS ==========
function balanceOf(address account) public view returns (uint);
function transfer(address to, uint value) public returns (bool);
function transferFrom(address from, address to, uint value) public returns (bool);
function exchange(bytes32 sourceCurrencyKey, uint sourceAmount, bytes32 destinationCurrencyKey)
external
returns (uint amountReceived);
function issueSynths(uint amount) external;
function issueMaxSynths() external;
function burnSynths(uint amount) external;
function burnSynthsToTarget() external;
function settle(bytes32 currencyKey) external returns (uint reclaimed, uint refunded, uint numEntries);
function collateralisationRatio(address issuer) public view returns (uint);
function totalIssuedSynths(bytes32 currencyKey) public view returns (uint);
function totalIssuedSynthsExcludeEtherCollateral(bytes32 currencyKey) public view returns (uint);
function debtBalanceOf(address issuer, bytes32 currencyKey) public view returns (uint);
function debtBalanceOfAndTotalDebt(address issuer, bytes32 currencyKey)
public
view
returns (uint debtBalance, uint totalSystemValue);
function remainingIssuableSynths(address issuer)
public
view
returns (uint maxIssuable, uint alreadyIssued, uint totalSystemDebt);
function maxIssuableSynths(address issuer) public view returns (uint maxIssuable);
function isWaitingPeriod(bytes32 currencyKey) external view returns (bool);
function emitSynthExchange(
address account,
bytes32 fromCurrencyKey,
uint fromAmount,
bytes32 toCurrencyKey,
uint toAmount,
address toAddress
) external;
function emitExchangeReclaim(address account, bytes32 currencyKey, uint amount) external;
function emitExchangeRebate(address account, bytes32 currencyKey, uint amount) external;
}
// https://docs.synthetix.io/contracts/SupplySchedule
contract SupplySchedule is Owned {
using SafeMath for uint;
using SafeDecimalMath for uint;
using Math for uint;
// Time of the last inflation supply mint event
uint public lastMintEvent;
// Counter for number of weeks since the start of supply inflation
uint public weekCounter;
// The number of SNX rewarded to the caller of Synthetix.mint()
uint public minterReward = 200 * SafeDecimalMath.unit();
// The initial weekly inflationary supply is 75m / 52 until the start of the decay rate.
// 75e6 * SafeDecimalMath.unit() / 52
uint public constant INITIAL_WEEKLY_SUPPLY = 1442307692307692307692307;
// Address of the SynthetixProxy for the onlySynthetix modifier
address public synthetixProxy;
// Max SNX rewards for minter
uint public constant MAX_MINTER_REWARD = 200 * SafeDecimalMath.unit();
// How long each inflation period is before mint can be called
uint public constant MINT_PERIOD_DURATION = 1 weeks;
uint public constant INFLATION_START_DATE = 1551830400; // 2019-03-06T00:00:00+00:00
uint public constant MINT_BUFFER = 1 days;
uint8 public constant SUPPLY_DECAY_START = 40; // Week 40
uint8 public constant SUPPLY_DECAY_END = 234; // Supply Decay ends on Week 234 (inclusive of Week 234 for a total of 195 weeks of inflation decay)
// Weekly percentage decay of inflationary supply from the first 40 weeks of the 75% inflation rate
uint public constant DECAY_RATE = 12500000000000000; // 1.25% weekly
// Percentage growth of terminal supply per annum
uint public constant TERMINAL_SUPPLY_RATE_ANNUAL = 25000000000000000; // 2.5% pa
constructor(address _owner, uint _lastMintEvent, uint _currentWeek) public Owned(_owner) {
lastMintEvent = _lastMintEvent;
weekCounter = _currentWeek;
}
// ========== VIEWS ==========
/**
* @return The amount of SNX mintable for the inflationary supply
*/
function mintableSupply() external view returns (uint) {
uint totalAmount;
if (!isMintable()) {
return totalAmount;
}
uint remainingWeeksToMint = weeksSinceLastIssuance();
uint currentWeek = weekCounter;
// Calculate total mintable supply from exponential decay function
// The decay function stops after week 234
while (remainingWeeksToMint > 0) {
currentWeek++;
if (currentWeek < SUPPLY_DECAY_START) {
// If current week is before supply decay we add initial supply to mintableSupply
totalAmount = totalAmount.add(INITIAL_WEEKLY_SUPPLY);
remainingWeeksToMint--;
} else if (currentWeek <= SUPPLY_DECAY_END) {
// if current week before supply decay ends we add the new supply for the week
// diff between current week and (supply decay start week - 1)
uint decayCount = currentWeek.sub(SUPPLY_DECAY_START - 1);
totalAmount = totalAmount.add(tokenDecaySupplyForWeek(decayCount));
remainingWeeksToMint--;
} else {
// Terminal supply is calculated on the total supply of Synthetix including any new supply
// We can compound the remaining week's supply at the fixed terminal rate
uint totalSupply = ISynthetix(synthetixProxy).totalSupply();
uint currentTotalSupply = totalSupply.add(totalAmount);
totalAmount = totalAmount.add(terminalInflationSupply(currentTotalSupply, remainingWeeksToMint));
remainingWeeksToMint = 0;
}
}
return totalAmount;
}
/**
* @return A unit amount of decaying inflationary supply from the INITIAL_WEEKLY_SUPPLY
* @dev New token supply reduces by the decay rate each week calculated as supply = INITIAL_WEEKLY_SUPPLY * ()
*/
function tokenDecaySupplyForWeek(uint counter) public pure returns (uint) {
// Apply exponential decay function to number of weeks since
// start of inflation smoothing to calculate diminishing supply for the week.
uint effectiveDecay = (SafeDecimalMath.unit().sub(DECAY_RATE)).powDecimal(counter);
uint supplyForWeek = INITIAL_WEEKLY_SUPPLY.multiplyDecimal(effectiveDecay);
return supplyForWeek;
}
/**
* @return A unit amount of terminal inflation supply
* @dev Weekly compound rate based on number of weeks
*/
function terminalInflationSupply(uint totalSupply, uint numOfWeeks) public pure returns (uint) {
// rate = (1 + weekly rate) ^ num of weeks
uint effectiveCompoundRate = SafeDecimalMath.unit().add(TERMINAL_SUPPLY_RATE_ANNUAL.div(52)).powDecimal(numOfWeeks);
// return Supply * (effectiveRate - 1) for extra supply to issue based on number of weeks
return totalSupply.multiplyDecimal(effectiveCompoundRate.sub(SafeDecimalMath.unit()));
}
/**
* @dev Take timeDiff in seconds (Dividend) and MINT_PERIOD_DURATION as (Divisor)
* @return Calculate the numberOfWeeks since last mint rounded down to 1 week
*/
function weeksSinceLastIssuance() public view returns (uint) {
// Get weeks since lastMintEvent
// If lastMintEvent not set or 0, then start from inflation start date.
uint timeDiff = lastMintEvent > 0 ? now.sub(lastMintEvent) : now.sub(INFLATION_START_DATE);
return timeDiff.div(MINT_PERIOD_DURATION);
}
/**
* @return boolean whether the MINT_PERIOD_DURATION (7 days)
* has passed since the lastMintEvent.
* */
function isMintable() public view returns (bool) {
if (now - lastMintEvent > MINT_PERIOD_DURATION) {
return true;
}
return false;
}
// ========== MUTATIVE FUNCTIONS ==========
/**
* @notice Record the mint event from Synthetix by incrementing the inflation
* week counter for the number of weeks minted (probabaly always 1)
* and store the time of the event.
* @param supplyMinted the amount of SNX the total supply was inflated by.
* */
function recordMintEvent(uint supplyMinted) external onlySynthetix returns (bool) {
uint numberOfWeeksIssued = weeksSinceLastIssuance();
// add number of weeks minted to weekCounter
weekCounter = weekCounter.add(numberOfWeeksIssued);
// Update mint event to latest week issued (start date + number of weeks issued * seconds in week)
// 1 day time buffer is added so inflation is minted after feePeriod closes
lastMintEvent = INFLATION_START_DATE.add(weekCounter.mul(MINT_PERIOD_DURATION)).add(MINT_BUFFER);
emit SupplyMinted(supplyMinted, numberOfWeeksIssued, lastMintEvent, now);
return true;
}
/**
* @notice Sets the reward amount of SNX for the caller of the public
* function Synthetix.mint().
* This incentivises anyone to mint the inflationary supply and the mintr
* Reward will be deducted from the inflationary supply and sent to the caller.
* @param amount the amount of SNX to reward the minter.
* */
function setMinterReward(uint amount) external onlyOwner {
require(amount <= MAX_MINTER_REWARD, "Reward cannot exceed max minter reward");
minterReward = amount;
emit MinterRewardUpdated(minterReward);
}
// ========== SETTERS ========== */
/**
* @notice Set the SynthetixProxy should it ever change.
* SupplySchedule requires Synthetix address as it has the authority
* to record mint event.
* */
function setSynthetixProxy(ISynthetix _synthetixProxy) external onlyOwner {
require(_synthetixProxy != address(0), "Address cannot be 0");
synthetixProxy = _synthetixProxy;
emit SynthetixProxyUpdated(synthetixProxy);
}
// ========== MODIFIERS ==========
/**
* @notice Only the Synthetix contract is authorised to call this function
* */
modifier onlySynthetix() {
require(
msg.sender == address(Proxy(synthetixProxy).target()),
"Only the synthetix contract can perform this action"
);
_;
}
/* ========== EVENTS ========== */
/**
* @notice Emitted when the inflationary supply is minted
* */
event SupplyMinted(uint supplyMinted, uint numberOfWeeksIssued, uint lastMintEvent, uint timestamp);
/**
* @notice Emitted when the SNX minter reward amount is updated
* */
event MinterRewardUpdated(uint newRewardAmount);
/**
* @notice Emitted when setSynthetixProxy is called changing the Synthetix Proxy address
* */
event SynthetixProxyUpdated(address newAddress);
}
/**
* @title RewardsDistribution interface
*/
interface IRewardsDistribution {
function distributeRewards(uint amount) external;
}
contract IEtherCollateral {
uint256 public totalIssuedSynths;
}
// https://docs.synthetix.io/contracts/Synthetix
contract Synthetix is ExternStateToken, MixinResolver {
// ========== STATE VARIABLES ==========
// Available Synths which can be used with the system
Synth[] public availableSynths;
mapping(bytes32 => Synth) public synths;
mapping(address => bytes32) public synthsByAddress;
string constant TOKEN_NAME = "Synthetix Network Token";
string constant TOKEN_SYMBOL = "SNX";
uint8 constant DECIMALS = 18;
bytes32 constant sUSD = "sUSD";
/* ========== ADDRESS RESOLVER CONFIGURATION ========== */
bytes32 private constant CONTRACT_SYSTEMSTATUS = "SystemStatus";
bytes32 private constant CONTRACT_EXCHANGER = "Exchanger";
bytes32 private constant CONTRACT_ETHERCOLLATERAL = "EtherCollateral";
bytes32 private constant CONTRACT_ISSUER = "Issuer";
bytes32 private constant CONTRACT_SYNTHETIXSTATE = "SynthetixState";
bytes32 private constant CONTRACT_EXRATES = "ExchangeRates";
bytes32 private constant CONTRACT_FEEPOOL = "FeePool";
bytes32 private constant CONTRACT_SUPPLYSCHEDULE = "SupplySchedule";
bytes32 private constant CONTRACT_REWARDESCROW = "RewardEscrow";
bytes32 private constant CONTRACT_SYNTHETIXESCROW = "SynthetixEscrow";
bytes32 private constant CONTRACT_REWARDSDISTRIBUTION = "RewardsDistribution";
bytes32[24] private addressesToCache = [
CONTRACT_SYSTEMSTATUS,
CONTRACT_EXCHANGER,
CONTRACT_ETHERCOLLATERAL,
CONTRACT_ISSUER,
CONTRACT_SYNTHETIXSTATE,
CONTRACT_EXRATES,
CONTRACT_FEEPOOL,
CONTRACT_SUPPLYSCHEDULE,
CONTRACT_REWARDESCROW,
CONTRACT_SYNTHETIXESCROW,
CONTRACT_REWARDSDISTRIBUTION
];
// ========== CONSTRUCTOR ==========
/**
* @dev Constructor
* @param _proxy The main token address of the Proxy contract. This will be ProxyERC20.sol
* @param _tokenState Address of the external immutable contract containing token balances.
* @param _owner The owner of this contract.
* @param _totalSupply On upgrading set to reestablish the current total supply (This should be in SynthetixState if ever updated)
* @param _resolver The address of the Synthetix Address Resolver
*/
constructor(address _proxy, TokenState _tokenState, address _owner, uint _totalSupply, address _resolver)
public
ExternStateToken(_proxy, _tokenState, TOKEN_NAME, TOKEN_SYMBOL, _totalSupply, DECIMALS, _owner)
MixinResolver(_owner, _resolver, addressesToCache)
{}
/* ========== VIEWS ========== */
function systemStatus() internal view returns (ISystemStatus) {
return ISystemStatus(requireAndGetAddress(CONTRACT_SYSTEMSTATUS, "Missing SystemStatus address"));
}
function exchanger() internal view returns (IExchanger) {
return IExchanger(requireAndGetAddress(CONTRACT_EXCHANGER, "Missing Exchanger address"));
}
function etherCollateral() internal view returns (IEtherCollateral) {
return IEtherCollateral(requireAndGetAddress(CONTRACT_ETHERCOLLATERAL, "Missing EtherCollateral address"));
}
function issuer() internal view returns (IIssuer) {
return IIssuer(requireAndGetAddress(CONTRACT_ISSUER, "Missing Issuer address"));
}
function synthetixState() internal view returns (ISynthetixState) {
return ISynthetixState(requireAndGetAddress(CONTRACT_SYNTHETIXSTATE, "Missing SynthetixState address"));
}
function exchangeRates() internal view returns (IExchangeRates) {
return IExchangeRates(requireAndGetAddress(CONTRACT_EXRATES, "Missing ExchangeRates address"));
}
function feePool() internal view returns (IFeePool) {
return IFeePool(requireAndGetAddress(CONTRACT_FEEPOOL, "Missing FeePool address"));
}
function supplySchedule() internal view returns (SupplySchedule) {
return SupplySchedule(requireAndGetAddress(CONTRACT_SUPPLYSCHEDULE, "Missing SupplySchedule address"));
}
function rewardEscrow() internal view returns (ISynthetixEscrow) {
return ISynthetixEscrow(requireAndGetAddress(CONTRACT_REWARDESCROW, "Missing RewardEscrow address"));
}
function synthetixEscrow() internal view returns (ISynthetixEscrow) {
return ISynthetixEscrow(requireAndGetAddress(CONTRACT_SYNTHETIXESCROW, "Missing SynthetixEscrow address"));
}
function rewardsDistribution() internal view returns (IRewardsDistribution) {
return
IRewardsDistribution(requireAndGetAddress(CONTRACT_REWARDSDISTRIBUTION, "Missing RewardsDistribution address"));
}
/**
* @notice Total amount of synths issued by the system, priced in currencyKey
* @param currencyKey The currency to value the synths in
*/
function _totalIssuedSynths(bytes32 currencyKey, bool excludeEtherCollateral) internal view returns (uint) {
IExchangeRates exRates = exchangeRates();
uint total = 0;
uint currencyRate = exRates.rateForCurrency(currencyKey);
(uint[] memory rates, bool anyRateStale) = exRates.ratesAndStaleForCurrencies(availableCurrencyKeys());
require(!anyRateStale, "Rates are stale");
for (uint i = 0; i < availableSynths.length; i++) {
// What's the total issued value of that synth in the destination currency?
// Note: We're not using exchangeRates().effectiveValue() because we don't want to go get the
// rate for the destination currency and check if it's stale repeatedly on every
// iteration of the loop
uint totalSynths = availableSynths[i].totalSupply();
// minus total issued synths from Ether Collateral from sETH.totalSupply()
if (excludeEtherCollateral && availableSynths[i] == synths["sETH"]) {
totalSynths = totalSynths.sub(etherCollateral().totalIssuedSynths());
}
uint synthValue = totalSynths.multiplyDecimalRound(rates[i]);
total = total.add(synthValue);
}
return total.divideDecimalRound(currencyRate);
}
/**
* @notice Total amount of synths issued by the system priced in currencyKey
* @param currencyKey The currency to value the synths in
*/
function totalIssuedSynths(bytes32 currencyKey) public view returns (uint) {
return _totalIssuedSynths(currencyKey, false);
}
/**
* @notice Total amount of synths issued by the system priced in currencyKey, excluding ether collateral
* @param currencyKey The currency to value the synths in
*/
function totalIssuedSynthsExcludeEtherCollateral(bytes32 currencyKey) public view returns (uint) {
return _totalIssuedSynths(currencyKey, true);
}
/**
* @notice Returns the currencyKeys of availableSynths for rate checking
*/
function availableCurrencyKeys() public view returns (bytes32[]) {
bytes32[] memory currencyKeys = new bytes32[](availableSynths.length);
for (uint i = 0; i < availableSynths.length; i++) {
currencyKeys[i] = synthsByAddress[availableSynths[i]];
}
return currencyKeys;
}
/**
* @notice Returns the count of available synths in the system, which you can use to iterate availableSynths
*/
function availableSynthCount() public view returns (uint) {
return availableSynths.length;
}
function isWaitingPeriod(bytes32 currencyKey) external view returns (bool) {
return exchanger().maxSecsLeftInWaitingPeriod(messageSender, currencyKey) > 0;
}
// ========== MUTATIVE FUNCTIONS ==========
/**
* @notice Add an associated Synth contract to the Synthetix system
* @dev Only the contract owner may call this.
*/
function addSynth(Synth synth) external optionalProxy_onlyOwner {
bytes32 currencyKey = synth.currencyKey();
require(synths[currencyKey] == Synth(0), "Synth already exists");
require(synthsByAddress[synth] == bytes32(0), "Synth address already exists");
availableSynths.push(synth);
synths[currencyKey] = synth;
synthsByAddress[synth] = currencyKey;
}
/**
* @notice Remove an associated Synth contract from the Synthetix system
* @dev Only the contract owner may call this.
*/
function removeSynth(bytes32 currencyKey) external optionalProxy_onlyOwner {
require(synths[currencyKey] != address(0), "Synth does not exist");
require(synths[currencyKey].totalSupply() == 0, "Synth supply exists");
require(currencyKey != sUSD, "Cannot remove synth");
// Save the address we're removing for emitting the event at the end.
address synthToRemove = synths[currencyKey];
// Remove the synth from the availableSynths array.
for (uint i = 0; i < availableSynths.length; i++) {
if (availableSynths[i] == synthToRemove) {
delete availableSynths[i];
// Copy the last synth into the place of the one we just deleted
// If there's only one synth, this is synths[0] = synths[0].
// If we're deleting the last one, it's also a NOOP in the same way.
availableSynths[i] = availableSynths[availableSynths.length - 1];
// Decrease the size of the array by one.
availableSynths.length--;
break;
}
}
// And remove it from the synths mapping
delete synthsByAddress[synths[currencyKey]];
delete synths[currencyKey];
// Note: No event here as Synthetix contract exceeds max contract size
// with these events, and it's unlikely people will need to
// track these events specifically.
}
/**
* @notice ERC20 transfer function.
*/
function transfer(address to, uint value) public optionalProxy returns (bool) {
systemStatus().requireSystemActive();
// Ensure they're not trying to exceed their staked SNX amount
require(value <= transferableSynthetix(messageSender), "Cannot transfer staked or escrowed SNX");
// Perform the transfer: if there is a problem an exception will be thrown in this call.
_transfer_byProxy(messageSender, to, value);
return true;
}
/**
* @notice ERC20 transferFrom function.
*/
function transferFrom(address from, address to, uint value) public optionalProxy returns (bool) {
systemStatus().requireSystemActive();
// Ensure they're not trying to exceed their locked amount
require(value <= transferableSynthetix(from), "Cannot transfer staked or escrowed SNX");
// Perform the transfer: if there is a problem,
// an exception will be thrown in this call.
return _transferFrom_byProxy(messageSender, from, to, value);
}
function issueSynths(uint amount) external optionalProxy {
systemStatus().requireIssuanceActive();
return issuer().issueSynths(messageSender, amount);
}
function issueSynthsOnBehalf(address issueForAddress, uint amount) external optionalProxy {
systemStatus().requireIssuanceActive();
return issuer().issueSynthsOnBehalf(issueForAddress, messageSender, amount);
}
function issueMaxSynths() external optionalProxy {
systemStatus().requireIssuanceActive();
return issuer().issueMaxSynths(messageSender);
}
function issueMaxSynthsOnBehalf(address issueForAddress) external optionalProxy {
systemStatus().requireIssuanceActive();
return issuer().issueMaxSynthsOnBehalf(issueForAddress, messageSender);
}
function burnSynths(uint amount) external optionalProxy {
systemStatus().requireIssuanceActive();
return issuer().burnSynths(messageSender, amount);
}
function burnSynthsOnBehalf(address burnForAddress, uint amount) external optionalProxy {
systemStatus().requireIssuanceActive();
return issuer().burnSynthsOnBehalf(burnForAddress, messageSender, amount);
}
function burnSynthsToTarget() external optionalProxy {
systemStatus().requireIssuanceActive();
return issuer().burnSynthsToTarget(messageSender);
}
function burnSynthsToTargetOnBehalf(address burnForAddress) external optionalProxy {
systemStatus().requireIssuanceActive();
return issuer().burnSynthsToTargetOnBehalf(burnForAddress, messageSender);
}
function exchange(bytes32 sourceCurrencyKey, uint sourceAmount, bytes32 destinationCurrencyKey)
external
optionalProxy
returns (uint amountReceived)
{
systemStatus().requireExchangeActive();
systemStatus().requireSynthsActive(sourceCurrencyKey, destinationCurrencyKey);
return exchanger().exchange(messageSender, sourceCurrencyKey, sourceAmount, destinationCurrencyKey, messageSender);
}
function exchangeOnBehalf(
address exchangeForAddress,
bytes32 sourceCurrencyKey,
uint sourceAmount,
bytes32 destinationCurrencyKey
) external optionalProxy returns (uint amountReceived) {
systemStatus().requireExchangeActive();
systemStatus().requireSynthsActive(sourceCurrencyKey, destinationCurrencyKey);
return
exchanger().exchangeOnBehalf(
exchangeForAddress,
messageSender,
sourceCurrencyKey,
sourceAmount,
destinationCurrencyKey
);
}
function settle(bytes32 currencyKey)
external
optionalProxy
returns (uint reclaimed, uint refunded, uint numEntriesSettled)
{
return exchanger().settle(messageSender, currencyKey);
}
// ========== Issuance/Burning ==========
/**
* @notice The maximum synths an issuer can issue against their total synthetix quantity.
* This ignores any already issued synths, and is purely giving you the maximimum amount the user can issue.
*/
function maxIssuableSynths(address _issuer)
public
view
returns (
// We don't need to check stale rates here as effectiveValue will do it for us.
uint
)
{
// What is the value of their SNX balance in the destination currency?
uint destinationValue = exchangeRates().effectiveValue("SNX", collateral(_issuer), sUSD);
// They're allowed to issue up to issuanceRatio of that value
return destinationValue.multiplyDecimal(synthetixState().issuanceRatio());
}
/**
* @notice The current collateralisation ratio for a user. Collateralisation ratio varies over time
* as the value of the underlying Synthetix asset changes,
* e.g. based on an issuance ratio of 20%. if a user issues their maximum available
* synths when they hold $10 worth of Synthetix, they will have issued $2 worth of synths. If the value
* of Synthetix changes, the ratio returned by this function will adjust accordingly. Users are
* incentivised to maintain a collateralisation ratio as close to the issuance ratio as possible by
* altering the amount of fees they're able to claim from the system.
*/
function collateralisationRatio(address _issuer) public view returns (uint) {
uint totalOwnedSynthetix = collateral(_issuer);
if (totalOwnedSynthetix == 0) return 0;
uint debtBalance = debtBalanceOf(_issuer, "SNX");
return debtBalance.divideDecimalRound(totalOwnedSynthetix);
}
/**
* @notice If a user issues synths backed by SNX in their wallet, the SNX become locked. This function
* will tell you how many synths a user has to give back to the system in order to unlock their original
* debt position. This is priced in whichever synth is passed in as a currency key, e.g. you can price
* the debt in sUSD, or any other synth you wish.
*/
function debtBalanceOf(address _issuer, bytes32 currencyKey)
public
view
returns (
// Don't need to check for stale rates here because totalIssuedSynths will do it for us
uint
)
{
ISynthetixState state = synthetixState();
// What was their initial debt ownership?
(uint initialDebtOwnership, ) = state.issuanceData(_issuer);
// If it's zero, they haven't issued, and they have no debt.
if (initialDebtOwnership == 0) return 0;
(uint debtBalance, ) = debtBalanceOfAndTotalDebt(_issuer, currencyKey);
return debtBalance;
}
function debtBalanceOfAndTotalDebt(address _issuer, bytes32 currencyKey)
public
view
returns (uint debtBalance, uint totalSystemValue)
{
ISynthetixState state = synthetixState();
// What was their initial debt ownership?
uint initialDebtOwnership;
uint debtEntryIndex;
(initialDebtOwnership, debtEntryIndex) = state.issuanceData(_issuer);
// What's the total value of the system excluding ETH backed synths in their requested currency?
totalSystemValue = totalIssuedSynthsExcludeEtherCollateral(currencyKey);
// If it's zero, they haven't issued, and they have no debt.
if (initialDebtOwnership == 0) return (0, totalSystemValue);
// Figure out the global debt percentage delta from when they entered the system.
// This is a high precision integer of 27 (1e27) decimals.
uint currentDebtOwnership = state
.lastDebtLedgerEntry()
.divideDecimalRoundPrecise(state.debtLedger(debtEntryIndex))
.multiplyDecimalRoundPrecise(initialDebtOwnership);
// Their debt balance is their portion of the total system value.
uint highPrecisionBalance = totalSystemValue.decimalToPreciseDecimal().multiplyDecimalRoundPrecise(
currentDebtOwnership
);
// Convert back into 18 decimals (1e18)
debtBalance = highPrecisionBalance.preciseDecimalToDecimal();
}
/**
* @notice The remaining synths an issuer can issue against their total synthetix balance.
* @param _issuer The account that intends to issue
*/
function remainingIssuableSynths(address _issuer)
public
view
returns (
// Don't need to check for synth existing or stale rates because maxIssuableSynths will do it for us.
uint maxIssuable,
uint alreadyIssued,
uint totalSystemDebt
)
{
(alreadyIssued, totalSystemDebt) = debtBalanceOfAndTotalDebt(_issuer, sUSD);
maxIssuable = maxIssuableSynths(_issuer);
if (alreadyIssued >= maxIssuable) {
maxIssuable = 0;
} else {
maxIssuable = maxIssuable.sub(alreadyIssued);
}
}
/**
* @notice The total SNX owned by this account, both escrowed and unescrowed,
* against which synths can be issued.
* This includes those already being used as collateral (locked), and those
* available for further issuance (unlocked).
*/
function collateral(address account) public view returns (uint) {
uint balance = tokenState.balanceOf(account);
if (synthetixEscrow() != address(0)) {
balance = balance.add(synthetixEscrow().balanceOf(account));
}
if (rewardEscrow() != address(0)) {
balance = balance.add(rewardEscrow().balanceOf(account));
}
return balance;
}
/**
* @notice The number of SNX that are free to be transferred for an account.
* @dev Escrowed SNX are not transferable, so they are not included
* in this calculation.
* @notice SNX rate not stale is checked within debtBalanceOf
*/
function transferableSynthetix(address account)
public
view
rateNotStale("SNX") // SNX is not a synth so is not checked in totalIssuedSynths
returns (uint)
{
// How many SNX do they have, excluding escrow?
// Note: We're excluding escrow here because we're interested in their transferable amount
// and escrowed SNX are not transferable.
uint balance = tokenState.balanceOf(account);
// How many of those will be locked by the amount they've issued?
// Assuming issuance ratio is 20%, then issuing 20 SNX of value would require
// 100 SNX to be locked in their wallet to maintain their collateralisation ratio
// The locked synthetix value can exceed their balance.
uint lockedSynthetixValue = debtBalanceOf(account, "SNX").divideDecimalRound(synthetixState().issuanceRatio());
// If we exceed the balance, no SNX are transferable, otherwise the difference is.
if (lockedSynthetixValue >= balance) {
return 0;
} else {
return balance.sub(lockedSynthetixValue);
}
}
/**
* @notice Mints the inflationary SNX supply. The inflation shedule is
* defined in the SupplySchedule contract.
* The mint() function is publicly callable by anyone. The caller will
receive a minter reward as specified in supplySchedule.minterReward().
*/
function mint() external returns (bool) {
require(rewardsDistribution() != address(0), "RewardsDistribution not set");
systemStatus().requireIssuanceActive();
SupplySchedule _supplySchedule = supplySchedule();
IRewardsDistribution _rewardsDistribution = rewardsDistribution();
uint supplyToMint = _supplySchedule.mintableSupply();
require(supplyToMint > 0, "No supply is mintable");
// record minting event before mutation to token supply
_supplySchedule.recordMintEvent(supplyToMint);
// Set minted SNX balance to RewardEscrow's balance
// Minus the minterReward and set balance of minter to add reward
uint minterReward = _supplySchedule.minterReward();
// Get the remainder
uint amountToDistribute = supplyToMint.sub(minterReward);
// Set the token balance to the RewardsDistribution contract
tokenState.setBalanceOf(_rewardsDistribution, tokenState.balanceOf(_rewardsDistribution).add(amountToDistribute));
emitTransfer(this, _rewardsDistribution, amountToDistribute);
// Kick off the distribution of rewards
_rewardsDistribution.distributeRewards(amountToDistribute);
// Assign the minters reward.
tokenState.setBalanceOf(msg.sender, tokenState.balanceOf(msg.sender).add(minterReward));
emitTransfer(this, msg.sender, minterReward);
totalSupply = totalSupply.add(supplyToMint);
return true;
}
// ========== MODIFIERS ==========
modifier rateNotStale(bytes32 currencyKey) {
require(!exchangeRates().rateIsStale(currencyKey), "Rate stale or not a synth");
_;
}
modifier onlyExchanger() {
require(msg.sender == address(exchanger()), "Only the exchanger contract can invoke this function");
_;
}
// ========== EVENTS ==========
/* solium-disable */
event SynthExchange(
address indexed account,
bytes32 fromCurrencyKey,
uint256 fromAmount,
bytes32 toCurrencyKey,
uint256 toAmount,
address toAddress
);
bytes32 constant SYNTHEXCHANGE_SIG = keccak256("SynthExchange(address,bytes32,uint256,bytes32,uint256,address)");
function emitSynthExchange(
address account,
bytes32 fromCurrencyKey,
uint256 fromAmount,
bytes32 toCurrencyKey,
uint256 toAmount,
address toAddress
) external onlyExchanger {
proxy._emit(
abi.encode(fromCurrencyKey, fromAmount, toCurrencyKey, toAmount, toAddress),
2,
SYNTHEXCHANGE_SIG,
bytes32(account),
0,
0
);
}
event ExchangeReclaim(address indexed account, bytes32 currencyKey, uint amount);
bytes32 constant EXCHANGERECLAIM_SIG = keccak256("ExchangeReclaim(address,bytes32,uint256)");
function emitExchangeReclaim(address account, bytes32 currencyKey, uint256 amount) external onlyExchanger {
proxy._emit(abi.encode(currencyKey, amount), 2, EXCHANGERECLAIM_SIG, bytes32(account), 0, 0);
}
event ExchangeRebate(address indexed account, bytes32 currencyKey, uint amount);
bytes32 constant EXCHANGEREBATE_SIG = keccak256("ExchangeRebate(address,bytes32,uint256)");
function emitExchangeRebate(address account, bytes32 currencyKey, uint256 amount) external onlyExchanger {
proxy._emit(abi.encode(currencyKey, amount), 2, EXCHANGEREBATE_SIG, bytes32(account), 0, 0);
}
/* solium-enable */
}Contract Security Audit
- No Contract Security Audit Submitted- Submit Audit Here
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
000000000000000000000000c011a72400e58ecd99ee497cf89e3775d4bd732f0000000000000000000000005b1b5fea1b99d83ad479df0c222f0492385381dd000000000000000000000000de910777c787903f78c89e7a0bf7f4c435cbb1fe000000000000000000000000000000000000000000926dd0793aa83c81d57abe000000000000000000000000fbb6526ed92da8915d4843a86166020d0b7baad0
-----Decoded View---------------
Arg [0] : _proxy (address): 0xC011A72400E58ecD99Ee497CF89E3775d4bd732F
Arg [1] : _tokenState (address): 0x5b1b5fEa1b99D83aD479dF0C222F0492385381dD
Arg [2] : _owner (address): 0xDe910777C787903F78C89e7a0bf7F4C435cBB1Fe
Arg [3] : _totalSupply (uint256): 177021753268615387490384574
Arg [4] : _resolver (address): 0xFbB6526ed92DA8915d4843a86166020d0B7bAAd0
-----Encoded View---------------
5 Constructor Arguments found :
Arg [0] : 000000000000000000000000c011a72400e58ecd99ee497cf89e3775d4bd732f
Arg [1] : 0000000000000000000000005b1b5fea1b99d83ad479df0c222f0492385381dd
Arg [2] : 000000000000000000000000de910777c787903f78c89e7a0bf7f4c435cbb1fe
Arg [3] : 000000000000000000000000000000000000000000926dd0793aa83c81d57abe
Arg [4] : 000000000000000000000000fbb6526ed92da8915d4843a86166020d0b7baad0
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OVERVIEW
The legacy contract address for Synthetix: Synth SNX.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.