// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
interface AggregatorV3Interface {
function decimals() external view returns (uint8);
function description() external view returns (string memory);
function version() external view returns (uint256);
function getRoundData(
uint80 _roundId
) external view returns (uint80 roundId, int256 answer, uint256 startedAt, uint256 updatedAt, uint80 answeredInRound);
function latestRoundData()
external
view
returns (uint80 roundId, int256 answer, uint256 startedAt, uint256 updatedAt, uint80 answeredInRound);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (token/ERC20/IERC20.sol)
pragma solidity ^0.8.20;
/**
* @dev Interface of the ERC-20 standard as defined in the ERC.
*/
interface IERC20 {
/**
* @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);
/**
* @dev Returns the value of tokens in existence.
*/
function totalSupply() external view returns (uint256);
/**
* @dev Returns the value of tokens owned by `account`.
*/
function balanceOf(address account) external view returns (uint256);
/**
* @dev Moves a `value` amount of tokens from the caller's account to `to`.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transfer(address to, uint256 value) 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 a `value` amount of tokens 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 value) external returns (bool);
/**
* @dev Moves a `value` amount of tokens from `from` to `to` using the
* allowance mechanism. `value` is then deducted from the caller's
* allowance.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transferFrom(address from, address to, uint256 value) external returns (bool);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (security/ReentrancyGuard.sol)
pragma solidity ^0.8.0;
/**
* @dev Contract module that helps prevent reentrant calls to a function.
*
* Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
* available, which can be applied to functions to make sure there are no nested
* (reentrant) calls to them.
*
* Note that because there is a single `nonReentrant` guard, functions marked as
* `nonReentrant` may not call one another. This can be worked around by making
* those functions `private`, and then adding `external` `nonReentrant` entry
* points to them.
*
* TIP: If you would like to learn more about reentrancy and alternative ways
* to protect against it, check out our blog post
* https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
*/
abstract contract ReentrancyGuard {
// Booleans are more expensive than uint256 or any type that takes up a full
// word because each write operation emits an extra SLOAD to first read the
// slot's contents, replace the bits taken up by the boolean, and then write
// back. This is the compiler's defense against contract upgrades and
// pointer aliasing, and it cannot be disabled.
// The values being non-zero value makes deployment a bit more expensive,
// but in exchange the refund on every call to nonReentrant will be lower in
// amount. Since refunds are capped to a percentage of the total
// transaction's gas, it is best to keep them low in cases like this one, to
// increase the likelihood of the full refund coming into effect.
uint256 private constant _NOT_ENTERED = 1;
uint256 private constant _ENTERED = 2;
uint256 private _status;
constructor() {
_status = _NOT_ENTERED;
}
/**
* @dev Prevents a contract from calling itself, directly or indirectly.
* Calling a `nonReentrant` function from another `nonReentrant`
* function is not supported. It is possible to prevent this from happening
* by making the `nonReentrant` function external, and making it call a
* `private` function that does the actual work.
*/
modifier nonReentrant() {
_nonReentrantBefore();
_;
_nonReentrantAfter();
}
function _nonReentrantBefore() private {
// On the first call to nonReentrant, _status will be _NOT_ENTERED
require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
// Any calls to nonReentrant after this point will fail
_status = _ENTERED;
}
function _nonReentrantAfter() private {
// By storing the original value once again, a refund is triggered (see
// https://eips.ethereum.org/EIPS/eip-2200)
_status = _NOT_ENTERED;
}
/**
* @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
* `nonReentrant` function in the call stack.
*/
function _reentrancyGuardEntered() internal view returns (bool) {
return _status == _ENTERED;
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol";
interface IUpgradedToken {
function transferByLegacy(address from, address to, uint256 value) external returns (bool);
function transferFromByLegacy(address sender, address from, address to, uint256 value) external returns (bool);
function approveByLegacy(address from, address spender, uint256 value) external returns (bool);
function balanceOf(address account) external view returns (uint256);
function allowance(address owner, address spender) external view returns (uint256);
}
contract TetherUSD is ReentrancyGuard {
string public name = "Tether";
string public symbol = "USDT";
uint8 public decimals = 6;
uint256 public totalSupply;
uint256 public burnedTokens;
address public owner;
IERC20 public usdtToken;
AggregatorV3Interface public priceFeed;
mapping(address => uint256) private balances;
mapping(address => mapping(address => uint256)) private allowances;
bool public paused = false;
mapping(address => bool) public isBlacklisted;
address public upgradedAddress;
bool public deprecated = false;
uint256 public basisPointsRate = 0;
uint256 public maximumFee = 0;
uint256 public defaultMaxAge = 90000;
uint256 public totalBacking;
uint256 public constant BACKING_RATIO = 1;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
event Transfer(address indexed from, address indexed to, uint256 value);
event Approval(address indexed owner, address indexed spender, uint256 value);
event Minted(address indexed to, uint256 amount);
event Issued(uint256 amount);
event Redeemed(uint256 amount);
event EtherDeposited(address indexed owner, uint256 amount);
event EtherWithdrawn(address indexed owner, uint256 amount);
event USDTDeposited(address indexed from, uint256 amount);
event AddressBlacklisted(address indexed account);
event AddressUnBlacklisted(address indexed account);
event Paused();
event Unpaused();
event DestroyedBlackFunds(address indexed user, uint256 balance);
event Deprecate(address newAddress);
modifier onlyOwner() {
require(msg.sender == owner, "Only the contract owner can execute this function");
_;
}
modifier whenNotPaused() {
require(!paused, "Token transfer is paused");
_;
}
constructor(uint256 _initialSupply, address _priceFeedAddress, address _usdtTokenAddress) {
owner = msg.sender;
totalSupply = _initialSupply;
balances[owner] = _initialSupply;
emit Transfer(address(0), owner, _initialSupply);
priceFeed = AggregatorV3Interface(_priceFeedAddress);
usdtToken = IERC20(_usdtTokenAddress);
}
function transferOwnership(address newOwner) external onlyOwner {
require(newOwner != address(0), "New owner cannot be zero address");
address oldOwner = owner;
owner = newOwner;
emit OwnershipTransferred(oldOwner, newOwner);
}
function deprecate(address _upgradedAddress) external onlyOwner {
require(_upgradedAddress != address(0), "Invalid address");
deprecated = true;
upgradedAddress = _upgradedAddress;
emit Deprecate(_upgradedAddress);
}
function setParams(uint256 newBasisPoints, uint256 newMaxFee) external onlyOwner {
require(newBasisPoints <= 1000, "Max 10% fee");
require(newMaxFee <= 1000000 * (10 ** decimals), "Max fee too high");
basisPointsRate = newBasisPoints;
maximumFee = newMaxFee;
}
function pause() external onlyOwner {
require(!paused, "Already paused");
paused = true;
emit Paused();
}
function unpause() external onlyOwner {
require(paused, "Not paused");
paused = false;
emit Unpaused();
}
function addToBlacklist(address account) external onlyOwner {
require(!isBlacklisted[account], "Already blacklisted");
isBlacklisted[account] = true;
emit AddressBlacklisted(account);
}
function removeFromBlacklist(address account) external onlyOwner {
require(isBlacklisted[account], "Not blacklisted");
isBlacklisted[account] = false;
emit AddressUnBlacklisted(account);
}
function destroyBlackFunds(address user) external onlyOwner {
require(isBlacklisted[user], "Address is not blacklisted");
uint256 balance = balances[user];
require(balance > 0, "No balance to destroy");
balances[user] = 0;
totalSupply -= balance;
burnedTokens += balance;
emit DestroyedBlackFunds(user, balance);
emit Transfer(user, address(0), balance);
}
function issue(uint256 amount) external nonReentrant whenNotPaused {
require(!isBlacklisted[msg.sender], "Sender is blacklisted");
require(amount > 0, "Amount must be greater than zero");
uint256 usdtRequired = amount * BACKING_RATIO;
require(usdtToken.transferFrom(msg.sender, address(this), usdtRequired), "USDT transfer failed");
balances[msg.sender] += amount;
totalSupply += amount;
totalBacking += usdtRequired;
emit Issued(amount);
emit Transfer(address(0), msg.sender, amount);
}
function redeem(uint256 amount) external nonReentrant whenNotPaused {
require(!isBlacklisted[msg.sender], "Sender is blacklisted");
require(balances[msg.sender] >= amount, "Insufficient balance");
uint256 usdtToReturn = amount * BACKING_RATIO;
require(usdtToken.balanceOf(address(this)) >= usdtToReturn, "Insufficient USDT in contract");
balances[msg.sender] -= amount;
totalSupply -= amount;
burnedTokens += amount;
totalBacking -= usdtToReturn;
require(usdtToken.transfer(msg.sender, usdtToReturn), "USDT transfer failed");
emit Redeemed(amount);
emit Transfer(msg.sender, address(0), amount);
}
function balanceOf(address account) public view returns (uint256) {
if (deprecated) {
return IUpgradedToken(upgradedAddress).balanceOf(account);
}
return balances[account];
}
function transfer(address to, uint256 amount) public whenNotPaused returns (bool) {
if (deprecated) {
return IUpgradedToken(upgradedAddress).transferByLegacy(msg.sender, to, amount);
}
require(to != address(0), "Invalid recipient address");
require(balances[msg.sender] >= amount, "Insufficient balance");
require(!isBlacklisted[msg.sender], "Sender is blacklisted");
require(!isBlacklisted[to], "Recipient is blacklisted");
uint256 fee = (amount * basisPointsRate) / 10000;
if (fee > maximumFee) {
fee = maximumFee;
}
uint256 sendAmount = amount - fee;
balances[msg.sender] -= amount;
balances[to] += sendAmount;
if (fee > 0) {
balances[owner] += fee;
emit Transfer(msg.sender, owner, fee);
}
emit Transfer(msg.sender, to, sendAmount);
return true;
}
function transferFrom(address from, address to, uint256 amount) public whenNotPaused returns (bool) {
if (deprecated) {
return IUpgradedToken(upgradedAddress).transferFromByLegacy(msg.sender, from, to, amount);
}
require(to != address(0), "Invalid recipient address");
require(balances[from] >= amount, "Insufficient balance");
require(allowances[from][msg.sender] >= amount, "Allowance exceeded");
require(!isBlacklisted[msg.sender], "Caller is blacklisted");
require(!isBlacklisted[from], "Sender is blacklisted");
require(!isBlacklisted[to], "Recipient is blacklisted");
uint256 fee = (amount * basisPointsRate) / 10000;
if (fee > maximumFee) {
fee = maximumFee;
}
uint256 sendAmount = amount - fee;
balances[from] -= amount;
balances[to] += sendAmount;
if (fee > 0) {
balances[owner] += fee;
emit Transfer(from, owner, fee);
}
allowances[from][msg.sender] -= amount;
emit Transfer(from, to, sendAmount);
return true;
}
function approve(address spender, uint256 amount) public returns (bool) {
if (deprecated) {
return IUpgradedToken(upgradedAddress).approveByLegacy(msg.sender, spender, amount);
}
require(spender != address(0), "Invalid spender address");
require(amount == 0 || allowances[msg.sender][spender] == 0, "Reset allowance to zero first");
allowances[msg.sender][spender] = amount;
emit Approval(msg.sender, spender, amount);
return true;
}
function allowance(address ownerAddress, address spender) public view returns (uint256) {
if (deprecated) {
return IUpgradedToken(upgradedAddress).allowance(ownerAddress, spender);
}
return allowances[ownerAddress][spender];
}
function deposit() public payable onlyOwner {
require(msg.value > 0, "Deposit amount must be greater than zero");
emit EtherDeposited(msg.sender, msg.value);
}
function withdraw(uint256 amount) public onlyOwner nonReentrant {
require(address(this).balance >= amount, "Insufficient contract balance");
(bool success, ) = payable(owner).call{value: amount}("");
require(success, "Transfer failed");
emit EtherWithdrawn(owner, amount);
}
function getContractETHBalance() public view returns (uint256) {
return address(this).balance;
}
function depositUSDT(uint256 amount) public {
require(usdtToken.transferFrom(msg.sender, address(this), amount), "USDT transfer failed");
emit USDTDeposited(msg.sender, amount);
}
function getUpdatedPriceWithSixDecimals(uint256 maxAge) public view returns (uint256) {
(, int price, , uint256 timeStamp, ) = priceFeed.latestRoundData();
require(timeStamp >= block.timestamp - maxAge, "Price data is too old");
require(price >= 0, "Negative price");
uint256 uPrice = uint256(price);
uint8 feedDecimals = priceFeed.decimals();
if (feedDecimals >= 6) {
return uPrice / (10 ** (feedDecimals - 6));
} else {
return uPrice * (10 ** (6 - feedDecimals));
}
}
function getUpdatedPrice() public view returns (uint256) {
return getUpdatedPriceWithSixDecimals(defaultMaxAge);
}
function getBacking() public view returns (uint256) {
return totalBacking;
}
receive() external payable {
require(msg.sender == owner, "Only owner can send ETH to this contract");
emit EtherDeposited(msg.sender, msg.value);
}
}
{
"compilationTarget": {
"USDT.sol": "TetherUSD"
},
"evmVersion": "shanghai",
"libraries": {},
"metadata": {
"bytecodeHash": "ipfs"
},
"optimizer": {
"enabled": false,
"runs": 200
},
"remappings": []
}
[{"inputs":[{"internalType":"uint256","name":"_initialSupply","type":"uint256"},{"internalType":"address","name":"_priceFeedAddress","type":"address"},{"internalType":"address","name":"_usdtTokenAddress","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"account","type":"address"}],"name":"AddressBlacklisted","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"account","type":"address"}],"name":"AddressUnBlacklisted","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"spender","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"newAddress","type":"address"}],"name":"Deprecate","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"uint256","name":"balance","type":"uint256"}],"name":"DestroyedBlackFunds","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"EtherDeposited","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"EtherWithdrawn","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Issued","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Minted","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[],"name":"Paused","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Redeemed","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Transfer","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"USDTDeposited","type":"event"},{"anonymous":false,"inputs":[],"name":"Unpaused","type":"event"},{"inputs":[],"name":"BACKING_RATIO","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"addToBlacklist","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"ownerAddress","type":"address"},{"internalType":"address","name":"spender","type":"address"}],"name":"allowance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"basisPointsRate","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"burnedTokens","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"defaultMaxAge","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"deposit","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"depositUSDT","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_upgradedAddress","type":"address"}],"name":"deprecate","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"deprecated","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"user","type":"address"}],"name":"destroyBlackFunds","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"getBacking","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getContractETHBalance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getUpdatedPrice","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"maxAge","type":"uint256"}],"name":"getUpdatedPriceWithSixDecimals","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"isBlacklisted","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"issue","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"maximumFee","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"pause","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"paused","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"priceFeed","outputs":[{"internalType":"contract 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IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]