Contract Source Code:
//SPDX-License-Identifier: MIT
pragma solidity 0.8.14;
interface IERC20 {
function totalSupply() external view returns (uint256);
function symbol() external view returns(string memory);
function name() external view returns(string memory);
/**
* @dev Returns the amount of tokens owned by `account`.
*/
function balanceOf(address account) external view returns (uint256);
/**
* @dev Returns the number of decimal places
*/
function decimals() external view returns (uint8);
/**
* @dev Moves `amount` tokens from the caller's account to `recipient`.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transfer(address recipient, uint256 amount) external returns (bool);
/**
* @dev Returns the remaining number of tokens that `spender` will be
* allowed to spend on behalf of `owner` through {transferFrom}. This is
* zero by default.
*
* This value changes when {approve} or {transferFrom} are called.
*/
function allowance(address owner, address spender) external view returns (uint256);
/**
* @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* IMPORTANT: Beware that changing an allowance with this method brings the risk
* that someone may use both the old and the new allowance by unfortunate
* transaction ordering. One possible solution to mitigate this race
* condition is to first reduce the spender's allowance to 0 and set the
* desired value afterwards:
* https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
*
* Emits an {Approval} event.
*/
function approve(address spender, uint256 amount) external returns (bool);
/**
* @dev Moves `amount` tokens from `sender` to `recipient` using the
* allowance mechanism. `amount` is then deducted from the caller's
* allowance.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
/**
* @dev Emitted when `value` tokens are moved from one account (`from`) to
* another (`to`).
*
* Note that `value` may be zero.
*/
event Transfer(address indexed from, address indexed to, uint256 value);
/**
* @dev Emitted when the allowance of a `spender` for an `owner` is set by
* a call to {approve}. `value` is the new allowance.
*/
event Approval(address indexed owner, address indexed spender, uint256 value);
}
// SPDX-License-Identifier: GPL-3.0
pragma solidity 0.8.14;
/**
* @title Owner
* @dev Set & change owner
*/
contract Ownable {
address private owner;
// event for EVM logging
event OwnerSet(address indexed oldOwner, address indexed newOwner);
// modifier to check if caller is owner
modifier onlyOwner() {
// If the first argument of 'require' evaluates to 'false', execution terminates and all
// changes to the state and to Ether balances are reverted.
// This used to consume all gas in old EVM versions, but not anymore.
// It is often a good idea to use 'require' to check if functions are called correctly.
// As a second argument, you can also provide an explanation about what went wrong.
require(msg.sender == owner, "Caller is not owner");
_;
}
/**
* @dev Set contract deployer as owner
*/
constructor() {
owner = msg.sender; // 'msg.sender' is sender of current call, contract deployer for a constructor
emit OwnerSet(address(0), owner);
}
/**
* @dev Change owner
* @param newOwner address of new owner
*/
function changeOwner(address newOwner) public onlyOwner {
emit OwnerSet(owner, newOwner);
owner = newOwner;
}
/**
* @dev Return owner address
* @return address of owner
*/
function getOwner() external view returns (address) {
return owner;
}
}
//SPDX-License-Identifier: MIT
pragma solidity 0.8.14;
library SafeMath {
/**
* @dev Returns the addition of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `+` operator.
*
* Requirements:
*
* - Addition cannot overflow.
*/
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
require(c >= a, "SafeMath: addition overflow");
return c;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
return sub(a, b, "SafeMath: subtraction overflow");
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting with custom message on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b <= a, errorMessage);
uint256 c = a - b;
return c;
}
/**
* @dev Returns the multiplication of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `*` operator.
*
* Requirements:
*
* - Multiplication cannot overflow.
*/
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
// Gas optimization: this is cheaper than requiring 'a' not being zero, but the
// benefit is lost if 'b' is also tested.
// See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
if (a == 0) {
return 0;
}
uint256 c = a * b;
require(c / a == b, "SafeMath: multiplication overflow");
return c;
}
/**
* @dev Returns the integer division of two unsigned integers. Reverts on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
return div(a, b, "SafeMath: division by zero");
}
/**
* @dev Returns the integer division of two unsigned integers. Reverts with custom message on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b > 0, errorMessage);
uint256 c = a / b;
// assert(a == b * c + a % b); // There is no case in which this doesn't hold
return c;
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* Reverts when dividing by zero.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
return mod(a, b, "SafeMath: modulo by zero");
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* Reverts with custom message when dividing by zero.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b != 0, errorMessage);
return a % b;
}
}
//SPDX-License-Identifier: MIT
pragma solidity 0.8.14;
import "./IERC20.sol";
import "./Ownable.sol";
import "./SafeMath.sol";
interface IFeeReceiver {
function trigger() external;
}
interface IEmissionRecipient {
function trigger() external;
}
interface ISwapper {
function buy(address user) external payable;
function sell(address user) external;
}
/**
Modular Upgradeable Token
Token System Designed By DeFi Mark
*/
contract Stasis is IERC20, Ownable {
using SafeMath for uint256;
// total supply
uint256 private _totalSupply = 260_000_000 * 10**18;
// token data
string private constant _name = 'Stasis';
string private constant _symbol = 'STS';
uint8 private constant _decimals = 18;
// balances
mapping (address => uint256) private _balances;
mapping (address => mapping (address => uint256)) private _allowances;
// Swapper
address public swapper;
// Zero & DEAD addresses
address private immutable DEAD_ADDRESS = 0x000000000000000000000000000000000000dEaD;
address private immutable ZERO_ADDRESS = 0x0000000000000000000000000000000000000000;
// Amount Burned
uint256 public totalBurned;
// Taxation on transfers
uint256 public buyFee = 500;
uint256 public sellFee = 1000;
uint256 public transferFee = 0;
uint256 public constant TAX_DENOM = 10000;
// permissions
struct Permissions {
bool isFeeExempt;
bool isLiquidityPool;
}
mapping ( address => Permissions ) public permissions;
// Fee Recipients
address public sellFeeRecipient;
address public buyFeeRecipient;
address public transferFeeRecipient;
// Trigger Fee Recipients
bool public triggerBuyRecipient = true;
bool public triggerTransferRecipient = false;
bool public triggerSellRecipient = false;
// Launched, allows set up without bots
bool public launched = false;
// events
event SetBuyFeeRecipient(address recipient);
event SetSellFeeRecipient(address recipient);
event SetTransferFeeRecipient(address recipient);
event SetFeeExemption(address account, bool isFeeExempt);
event SetAutomatedMarketMaker(address account, bool isMarketMaker);
event SetFees(uint256 buyFee, uint256 sellFee, uint256 transferFee);
event SetSwapper(address newSwapper);
event Launched(uint256 blockNo);
event SetAutoTriggers(bool triggerBuy, bool triggerSell, bool triggerTransfer);
constructor() {
// exempt sender for tax-free initial distribution
permissions[msg.sender].isFeeExempt = true;
// initial supply allocation
_balances[msg.sender] = _totalSupply;
emit Transfer(address(0), msg.sender, _totalSupply);
}
/////////////////////////////////
///// ERC20 FUNCTIONS /////
/////////////////////////////////
function totalSupply() external view override returns (uint256) { return _totalSupply; }
function balanceOf(address account) public view override returns (uint256) { return _balances[account]; }
function allowance(address holder, address spender) external view override returns (uint256) { return _allowances[holder][spender]; }
function name() public pure override returns (string memory) {
return _name;
}
function symbol() public pure override returns (string memory) {
return _symbol;
}
function decimals() public pure override returns (uint8) {
return _decimals;
}
function approve(address spender, uint256 amount) public override returns (bool) {
_allowances[msg.sender][spender] = amount;
emit Approval(msg.sender, spender, amount);
return true;
}
/** Transfer Function */
function transfer(address recipient, uint256 amount) external override returns (bool) {
if (msg.sender == recipient) {
return _sell(amount, msg.sender);
} else {
return _transferFrom(msg.sender, recipient, amount);
}
}
/** Transfer Function */
function transferFrom(address sender, address recipient, uint256 amount) external override returns (bool) {
_allowances[sender][msg.sender] = _allowances[sender][msg.sender].sub(amount, 'Insufficient Allowance');
return _transferFrom(sender, recipient, amount);
}
/////////////////////////////////
///// PUBLIC FUNCTIONS /////
/////////////////////////////////
function burn(uint256 amount) external returns (bool) {
return _burn(msg.sender, amount);
}
function burnFrom(address account, uint256 amount) external returns (bool) {
_allowances[account][msg.sender] = _allowances[account][msg.sender].sub(amount, 'Insufficient Allowance');
return _burn(account, amount);
}
function sell(uint256 amount) external returns (bool) {
return _sell(amount, msg.sender);
}
function sellFor(uint256 amount, address recipient) external returns (bool) {
return _sell(amount, recipient);
}
function buyFor(address account) external payable {
require(
account != ZERO_ADDRESS ||
account != DEAD_ADDRESS, "Zero Address!"
);
ISwapper(swapper).buy{value: msg.value}(account);
}
receive() external payable {
ISwapper(swapper).buy{value: address(this).balance}(msg.sender);
}
/////////////////////////////////
///// OWNER FUNCTIONS /////
/////////////////////////////////
function withdraw(address token) external onlyOwner {
require(token != address(0), 'Zero Address');
bool s = IERC20(token).transfer(msg.sender, IERC20(token).balanceOf(address(this)));
require(s, 'Failure On Token Withdraw');
}
function withdrawBNB() external onlyOwner {
(bool s,) = payable(msg.sender).call{value: address(this).balance}("");
require(s);
}
function setTransferFeeRecipient(address recipient) external onlyOwner {
require(recipient != address(0), 'Zero Address');
permissions[transferFeeRecipient].isFeeExempt = false;
transferFeeRecipient = recipient;
permissions[recipient].isFeeExempt = true;
emit SetTransferFeeRecipient(recipient);
}
function setBuyFeeRecipient(address recipient) external onlyOwner {
require(recipient != address(0), 'Zero Address');
permissions[transferFeeRecipient].isFeeExempt = false;
buyFeeRecipient = recipient;
permissions[recipient].isFeeExempt = true;
emit SetBuyFeeRecipient(recipient);
}
function setSellFeeRecipient(address recipient) external onlyOwner {
require(recipient != address(0), 'Zero Address');
permissions[transferFeeRecipient].isFeeExempt = false;
sellFeeRecipient = recipient;
permissions[recipient].isFeeExempt = true;
emit SetSellFeeRecipient(recipient);
}
function registerAutomatedMarketMaker(address account) external onlyOwner {
require(account != address(0), 'Zero Address');
require(!permissions[account].isLiquidityPool, 'Already An AMM');
permissions[account].isLiquidityPool = true;
emit SetAutomatedMarketMaker(account, true);
}
function unRegisterAutomatedMarketMaker(address account) external onlyOwner {
require(account != address(0), 'Zero Address');
require(permissions[account].isLiquidityPool, 'Not An AMM');
permissions[account].isLiquidityPool = false;
emit SetAutomatedMarketMaker(account, false);
}
function setAutoTriggers(
bool autoBuyTrigger,
bool autoTransferTrigger,
bool autoSellTrigger
) external onlyOwner {
triggerBuyRecipient = autoBuyTrigger;
triggerTransferRecipient = autoTransferTrigger;
triggerSellRecipient = autoSellTrigger;
emit SetAutoTriggers(autoBuyTrigger, autoSellTrigger, autoTransferTrigger);
}
function setFees(uint _buyFee, uint _sellFee, uint _transferFee) external onlyOwner {
require(
_buyFee <= 2000,
'Buy Fee Too High'
);
require(
_sellFee <= 2000,
'Sell Fee Too High'
);
require(
_transferFee <= 2000,
'Transfer Fee Too High'
);
buyFee = _buyFee;
sellFee = _sellFee;
transferFee = _transferFee;
emit SetFees(_buyFee, _sellFee, _transferFee);
}
function setFeeExempt(address account, bool isExempt) external onlyOwner {
require(account != address(0), 'Zero Address');
permissions[account].isFeeExempt = isExempt;
emit SetFeeExemption(account, isExempt);
}
function setSwapper(address newSwapper) external onlyOwner {
require(
newSwapper != address(0),
'Zero Address'
);
swapper = newSwapper;
emit SetSwapper(newSwapper);
}
function launch() external onlyOwner {
require(launched == false, 'Already Launched');
launched = true;
emit Launched(block.number);
}
/////////////////////////////////
///// READ FUNCTIONS /////
/////////////////////////////////
function getTax(address sender, address recipient, uint256 amount) public view returns (uint256, address, bool) {
if ( permissions[sender].isFeeExempt || permissions[recipient].isFeeExempt ) {
return (0, address(0), false);
}
return permissions[sender].isLiquidityPool ?
(amount.mul(buyFee).div(TAX_DENOM), buyFeeRecipient, triggerBuyRecipient) :
permissions[recipient].isLiquidityPool ?
(amount.mul(sellFee).div(TAX_DENOM), sellFeeRecipient, triggerSellRecipient) :
(amount.mul(transferFee).div(TAX_DENOM), transferFeeRecipient, triggerTransferRecipient);
}
//////////////////////////////////
///// INTERNAL FUNCTIONS /////
//////////////////////////////////
/** Internal Transfer */
function _transferFrom(address sender, address recipient, uint256 amount) internal returns (bool) {
require(
recipient != address(0),
'Zero Recipient'
);
require(
amount > 0,
'Zero Amount'
);
require(
amount <= balanceOf(sender),
'Insufficient Balance'
);
// make pre-launch checks
if (!launched) {
require(
sender == this.getOwner(),
'Only Owner Can Transfer Tokens Pre Launch'
);
}
// decrement sender balance
_balances[sender] -= amount;
// fee for transaction
(uint256 fee, address feeDestination, bool trigger) = getTax(sender, recipient, amount);
// give amount to recipient less fee
uint256 sendAmount = amount - fee;
_balances[recipient] += sendAmount;
emit Transfer(sender, recipient, sendAmount);
// allocate fee if any
if (fee > 0) {
// if recipient field is valid
bool isValidRecipient = feeDestination != ZERO_ADDRESS && feeDestination != DEAD_ADDRESS && feeDestination != address(this);
// allocate amount to recipient
address feeRecipient = isValidRecipient ? feeDestination : address(this);
_balances[feeRecipient] = _balances[feeRecipient].add(fee);
emit Transfer(sender, feeRecipient, fee);
// if valid and trigger is enabled, trigger tokenomics mid transfer
if (trigger && isValidRecipient) {
uint256 _length;
assembly {
_length:= extcodesize(feeRecipient)
}
if(_length == 0) {
return true;
} else {
IFeeReceiver(feeRecipient).trigger();
}
}
}
return true;
}
function _burn(address account, uint256 amount) internal returns (bool) {
require(
account != address(0),
'Zero Address'
);
require(
amount > 0,
'Zero Amount'
);
require(
amount <= balanceOf(account),
'Insufficient Balance'
);
// delete from balance and supply
_balances[account] = _balances[account].sub(amount, 'Balance Underflow');
_totalSupply = _totalSupply.sub(amount, 'Supply Underflow');
// increment total burned
unchecked {
totalBurned += amount;
}
// emit transfer
emit Transfer(account, address(0), amount);
return true;
}
function _sell(uint256 amount, address recipient) internal returns (bool) {
require(
amount > 0,
'Zero Amount'
);
require(
recipient != address(0) && recipient != address(this) && recipient != swapper,
'Invalid Recipient'
);
require(
amount <= balanceOf(msg.sender),
'Insufficient Balance'
);
// re-allocate balances
_balances[msg.sender] = _balances[msg.sender].sub(amount);
_balances[swapper] = _balances[swapper].add(amount);
emit Transfer(msg.sender, swapper, amount);
// sell token for user
ISwapper(swapper).sell(recipient);
return true;
}
}