Contract Source Code:
File 1 of 1 : OUROBOROS
// SPDX-License-Identifier: MIT
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// 00 00 00 00 00 00 000
// 00 00 00000000 00000000 0000
// 00 00 00 00 00 00 000
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// 000000 00 000 00000000 000000
pragma solidity ^0.6.0;
/*
* @dev Provides information about the current execution context, including the
* sender of the transaction and its data. While these are generally available
* via msg.sender and msg.data, they should not be accessed in such a direct
* manner, since when dealing with GSN meta-transactions the account sending and
* paying for execution may not be the actual sender (as far as an application
* is concerned).
*
* This contract is only required for intermediate, library-like contracts.
*/
abstract contract Context {
function _msgSender() internal view virtual returns (address payable) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes memory) {
this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
return msg.data;
}
}
/**
* @dev Interface of the ERC20 standard as defined in the EIP.
*/
interface IERC20 {
/**
* @dev Returns the amount of tokens in existence.
*/
function totalSupply() external view returns (uint256);
/**
* @dev Returns the amount of tokens owned by `account`.
*/
function balanceOf(address account) external view returns (uint256);
/**
* @dev Moves `amount` tokens from the caller's account to `recipient`.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transfer(address recipient, uint256 amount) external returns (bool);
/**
* @dev Returns the remaining number of tokens that `spender` will be
* allowed to spend on behalf of `owner` through {transferFrom}. This is
* zero by default.
*
* This value changes when {approve} or {transferFrom} are called.
*/
function allowance(address owner, address spender) external view returns (uint256);
/**
* @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* IMPORTANT: Beware that changing an allowance with this method brings the risk
* that someone may use both the old and the new allowance by unfortunate
* transaction ordering. One possible solution to mitigate this race
* condition is to first reduce the spender's allowance to 0 and set the
* desired value afterwards:
* https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
*
* Emits an {Approval} event.
*/
function approve(address spender, uint256 amount) external returns (bool);
/**
* @dev Moves `amount` tokens from `sender` to `recipient` using the
* allowance mechanism. `amount` is then deducted from the caller's
* allowance.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
/**
* @dev Emitted when `value` tokens are moved from one account (`from`) to
* another (`to`).
*
* Note that `value` may be zero.
*/
event Transfer(address indexed from, address indexed to, uint256 value);
/**
* @dev Emitted when the allowance of a `spender` for an `owner` is set by
* a call to {approve}. `value` is the new allowance.
*/
event Approval(address indexed owner, address indexed spender, uint256 value);
}
/**
* @dev Wrappers over Solidity's arithmetic operations with added overflow
* checks.
*
* Arithmetic operations in Solidity wrap on overflow. This can easily result
* in bugs, because programmers usually assume that an overflow raises an
* error, which is the standard behavior in high level programming languages.
* `SafeMath` restores this intuition by reverting the transaction when an
* operation overflows.
*
* Using this library instead of the unchecked operations eliminates an entire
* class of bugs, so it's recommended to use it always.
*/
library SafeMath {
/**
* @dev Returns the addition of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `+` operator.
*
* Requirements:
*
* - Addition cannot overflow.
*/
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
require(c >= a, "SafeMath: addition overflow");
return c;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
return sub(a, b, "SafeMath: subtraction overflow");
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting with custom message on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/
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;
}
}
/**
* @dev Collection of functions related to the address type
*/
library Address {
/**
* @dev Returns true if `account` is a contract.
*
* [IMPORTANT]
* ====
* It is unsafe to assume that an address for which this function returns
* false is an externally-owned account (EOA) and not a contract.
*
* Among others, `isContract` will return false for the following
* types of addresses:
*
* - an externally-owned account
* - a contract in construction
* - an address where a contract will be created
* - an address where a contract lived, but was destroyed
* ====
*/
function isContract(address account) internal view returns (bool) {
// According to EIP-1052, 0x0 is the value returned for not-yet created accounts
// and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
// for accounts without code, i.e. `keccak256('')`
bytes32 codehash;
bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
// solhint-disable-next-line no-inline-assembly
assembly { codehash := extcodehash(account) }
return (codehash != accountHash && codehash != 0x0);
}
/**
* @dev Replacement for Solidity's `transfer`: sends `amount` wei to
* `recipient`, forwarding all available gas and reverting on errors.
*
* https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
* of certain opcodes, possibly making contracts go over the 2300 gas limit
* imposed by `transfer`, making them unable to receive funds via
* `transfer`. {sendValue} removes this limitation.
*
* https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
*
* IMPORTANT: because control is transferred to `recipient`, care must be
* taken to not create reentrancy vulnerabilities. Consider using
* {ReentrancyGuard} or the
* https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
*/
function sendValue(address payable recipient, uint256 amount) internal {
require(address(this).balance >= amount, "Address: insufficient balance");
// solhint-disable-next-line avoid-low-level-calls, avoid-call-value
(bool success, ) = recipient.call{ value: amount }("");
require(success, "Address: unable to send value, recipient may have reverted");
}
/**
* @dev Performs a Solidity function call using a low level `call`. A
* plain`call` is an unsafe replacement for a function call: use this
* function instead.
*
* If `target` reverts with a revert reason, it is bubbled up by this
* function (like regular Solidity function calls).
*
* Returns the raw returned data. To convert to the expected return value,
* use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
*
* Requirements:
*
* - `target` must be a contract.
* - calling `target` with `data` must not revert.
*
* _Available since v3.1._
*/
function functionCall(address target, bytes memory data) internal returns (bytes memory) {
return functionCall(target, data, "Address: low-level call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
* `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
return _functionCallWithValue(target, data, 0, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but also transferring `value` wei to `target`.
*
* Requirements:
*
* - the calling contract must have an ETH balance of at least `value`.
* - the called Solidity function must be `payable`.
*
* _Available since v3.1._
*/
function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
}
/**
* @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
* with `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
require(address(this).balance >= value, "Address: insufficient balance for call");
return _functionCallWithValue(target, data, value, errorMessage);
}
function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {
require(isContract(target), "Address: call to non-contract");
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory returndata) = target.call{ value: weiValue }(data);
if (success) {
return returndata;
} else {
// Look for revert reason and bubble it up if present
if (returndata.length > 0) {
// The easiest way to bubble the revert reason is using memory via assembly
// solhint-disable-next-line no-inline-assembly
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
}
/**
* @dev Contract module which provides a basic access control mechanism, where
* there is an account (an owner) that can be granted exclusive access to
* specific functions.
*
* By default, the owner account will be the one that deploys the contract. This
* can later be changed with {transferOwnership}.
*
* This module is used through inheritance. It will make available the modifier
* `onlyOwner`, which can be applied to your functions to restrict their use to
* the owner.
*/
contract Ownable is Context {
address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
* @dev Initializes the contract setting the deployer as the initial owner.
*/
constructor () internal {
address msgSender = _msgSender();
_owner = msgSender;
emit OwnershipTransferred(address(0), msgSender);
}
/**
* @dev Returns the address of the current owner.
*/
function owner() public view returns (address) {
return _owner;
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
require(_owner == _msgSender(), "Ownable: caller is not the owner");
_;
}
/**
* @dev Leaves the contract without owner. It will not be possible to call
* `onlyOwner` functions anymore. Can only be called by the current owner.
*
* NOTE: Renouncing ownership will leave the contract without an owner,
* thereby removing any functionality that is only available to the owner.
*/
function renounceOwnership() public virtual onlyOwner {
emit OwnershipTransferred(_owner, address(0));
_owner = address(0);
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Can only be called by the current owner.
*/
function transferOwnership(address newOwner) public virtual onlyOwner {
require(newOwner != address(0), "Ownable: new owner is the zero address");
emit OwnershipTransferred(_owner, newOwner);
_owner = newOwner;
}
}
interface IUniswapV2Factory {
function createPair(address tokenA, address tokenB) external returns (address pair);
}
interface IUniswapV2Pair {
function sync() external;
}
interface IUniswapV2Router01 {
function factory() external pure returns (address);
function WETH() external pure returns (address);
function addLiquidity(
address tokenA,
address tokenB,
uint amountADesired,
uint amountBDesired,
uint amountAMin,
uint amountBMin,
address to,
uint deadline
) external returns (uint amountA, uint amountB, uint liquidity);
function addLiquidityETH(
address token,
uint amountTokenDesired,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline
) external payable returns (uint amountToken, uint amountETH, uint liquidity);
}
interface IUniswapV2Router02 is IUniswapV2Router01 {
function removeLiquidityETHSupportingFeeOnTransferTokens(
address token,
uint liquidity,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline
) external returns (uint amountETH);
function swapExactTokensForETHSupportingFeeOnTransferTokens(
uint amountIn,
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) external;
function swapExactTokensForTokensSupportingFeeOnTransferTokens(
uint amountIn,
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) external;
function swapExactETHForTokensSupportingFeeOnTransferTokens(
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) external payable;
}
pragma solidity ^0.6.12;
contract RewardWallet {
constructor() public {
}
}
contract Balancer {
using SafeMath for uint256;
IUniswapV2Router02 public immutable _uniswapV2Router;
OUROBOROS private _tokenContract;
constructor(OUROBOROS tokenContract, IUniswapV2Router02 uniswapV2Router) public {
_tokenContract =tokenContract;
_uniswapV2Router = uniswapV2Router;
}
receive() external payable {}
function rebalance() external returns (uint256) {
swapEthForTokens(address(this).balance);
}
function swapEthForTokens(uint256 EthAmount) private {
address[] memory uniswapPairPath = new address[](2);
uniswapPairPath[0] = _uniswapV2Router.WETH();
uniswapPairPath[1] = address(_tokenContract);
_uniswapV2Router
.swapExactETHForTokensSupportingFeeOnTransferTokens{value: EthAmount}(
0,
uniswapPairPath,
address(this),
block.timestamp
);
}
}
contract Swaper {
using SafeMath for uint256;
IUniswapV2Router02 public immutable _uniswapV2Router;
OUROBOROS private _tokenContract;
constructor(OUROBOROS tokenContract, IUniswapV2Router02 uniswapV2Router) public {
_tokenContract = tokenContract;
_uniswapV2Router = uniswapV2Router;
}
function swapTokens(address pairTokenAddress, uint256 tokenAmount) external {
uint256 initialPairTokenBalance = IERC20(pairTokenAddress).balanceOf(address(this));
swapTokensForTokens(pairTokenAddress, tokenAmount);
uint256 newPairTokenBalance = IERC20(pairTokenAddress).balanceOf(address(this)).sub(initialPairTokenBalance);
IERC20(pairTokenAddress).transfer(address(_tokenContract), newPairTokenBalance);
}
function swapTokensForTokens(address pairTokenAddress, uint256 tokenAmount) private {
address[] memory path = new address[](2);
path[0] = address(_tokenContract);
path[1] = pairTokenAddress;
_tokenContract.approve(address(_uniswapV2Router), tokenAmount);
// make the swap
_uniswapV2Router.swapExactTokensForTokensSupportingFeeOnTransferTokens(
tokenAmount,
0, // accept any amount of pair token
path,
address(this),
block.timestamp
);
}
}
contract OUROBOROS is Context, IERC20, Ownable {
using SafeMath for uint256;
using Address for address;
IUniswapV2Router02 public immutable _uniswapV2Router;
mapping (address => uint256) private _rOwned;
mapping (address => uint256) private _tOwned;
mapping (address => mapping (address => uint256)) private _allowances;
mapping (address => bool) private _isExcluded;
address[] private _excluded;
address public _rewardWallet;
address public _uniswapETHPool;
uint256 private constant MAX = ~uint256(0);
uint256 private _tTotal = 1000000e9;
uint256 private _rTotal = (MAX - (MAX % _tTotal));
uint256 public _tFeeTotal;
uint256 public _tBurnTotal;
string private _name = 'Ouroboros';
string private _symbol = 'ORBS';
uint8 private _decimals = 9;
uint256 public _feeDecimals = 1;
uint256 public _taxFee = 0;
uint256 public _lockFee = 0;
uint256 public _maxTxAmount = 200000e9;
uint256 public _minTokensBeforeSwap = 1000e9;
uint256 private _autoSwapCallerFee = 20e9;
bool private inSwapAndLiquify;
bool public swapAndLiquifyEnabled;
bool public tradingEnabled;
address private currentPairTokenAddress;
address private currentPoolAddress;
uint256 private _liquidityRemoveFee = 50;
uint256 private _alchemyCallerFee = 20;
uint256 private _lastAlchemy;
uint256 private _alchemyInterval = 12 hours;
event FeeDecimalsUpdated(uint256 taxFeeDecimals);
event TaxFeeUpdated(uint256 taxFee);
event LockFeeUpdated(uint256 lockFee);
event MaxTxAmountUpdated(uint256 maxTxAmount);
event WhitelistUpdated(address indexed pairTokenAddress);
event TradingEnabled();
event SwapAndLiquifyEnabledUpdated(bool enabled);
event SwapAndLiquify(
address indexed pairTokenAddress,
uint256 tokensSwapped,
uint256 pairTokenReceived,
uint256 tokensIntoLiqudity
);
event Rebalance(uint256 tokenBurnt);
event MinTokensBeforeSwapUpdated(uint256 minTokensBeforeSwap);
event AutoSwapCallerFeeUpdated(uint256 autoSwapCallerFee);
event LiquidityRemoveFeeUpdated(uint256 liquidityRemoveFee);
event AlchemyCallerFeeUpdated(uint256 rebalnaceCallerFee);
event MinTokenForAlchemyUpdated(uint256 minRebalanceAmount);
event AlchemyIntervalUpdated(uint256 rebalanceInterval);
modifier lockTheSwap {
inSwapAndLiquify = true;
_;
inSwapAndLiquify = false;
}
Balancer public balancer;
Swaper public swaper;
constructor (IUniswapV2Router02 uniswapV2Router) public {
_lastAlchemy = now;
_uniswapV2Router = uniswapV2Router;
_rewardWallet = address(new RewardWallet());
balancer = new Balancer(this, uniswapV2Router);
swaper = new Swaper(this, uniswapV2Router);
currentPoolAddress = IUniswapV2Factory(uniswapV2Router.factory())
.createPair(address(this), uniswapV2Router.WETH());
currentPairTokenAddress = uniswapV2Router.WETH();
_uniswapETHPool = currentPoolAddress;
updateSwapAndLiquifyEnabled(false);
_rOwned[_msgSender()] = reflectionFromToken(_tTotal, false);
emit Transfer(address(0), _msgSender(), _tTotal);
}
function name() public view returns (string memory) {
return _name;
}
function symbol() public view returns (string memory) {
return _symbol;
}
function decimals() public view returns (uint8) {
return _decimals;
}
function totalSupply() public view override returns (uint256) {
return _tTotal;
}
function balanceOf(address account) public view override returns (uint256) {
if (_isExcluded[account]) return _tOwned[account];
return tokenFromReflection(_rOwned[account]);
}
function transfer(address recipient, uint256 amount) public override returns (bool) {
_transfer(_msgSender(), recipient, amount);
return true;
}
function allowance(address owner, address spender) public view override returns (uint256) {
return _allowances[owner][spender];
}
function approve(address spender, uint256 amount) public override returns (bool) {
_approve(_msgSender(), spender, amount);
return true;
}
function transferFrom(address sender, address recipient, uint256 amount) public override returns (bool) {
_transfer(sender, recipient, amount);
_approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
return true;
}
function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
return true;
}
function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
return true;
}
function isExcluded(address account) public view returns (bool) {
return _isExcluded[account];
}
function reflect(uint256 tAmount) public {
address sender = _msgSender();
require(!_isExcluded[sender], "Ouroboros: Excluded addresses cannot call this function");
(uint256 rAmount,,,,,) = _getValues(tAmount);
_rOwned[sender] = _rOwned[sender].sub(rAmount);
_rTotal = _rTotal.sub(rAmount);
_tFeeTotal = _tFeeTotal.add(tAmount);
}
function reflectionFromToken(uint256 tAmount, bool deductTransferFee) public view returns(uint256) {
require(tAmount <= _tTotal, "Amount must be less than supply");
if (!deductTransferFee) {
(uint256 rAmount,,,,,) = _getValues(tAmount);
return rAmount;
} else {
(,uint256 rTransferAmount,,,,) = _getValues(tAmount);
return rTransferAmount;
}
}
function tokenFromReflection(uint256 rAmount) public view returns(uint256) {
require(rAmount <= _rTotal, "Ouroboros: Amount must be less than total reflections");
uint256 currentRate = _getRate();
return rAmount.div(currentRate);
}
function excludeAccount(address account) external onlyOwner() {
require(account != 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D, 'Ouroboros: We can not exclude Uniswap router.');
require(account != address(this), 'Ouroboros: We can not exclude contract self.');
require(account != _rewardWallet, 'Ouroboros: We can not exclude reweard wallet.');
require(!_isExcluded[account], "Ouroboros: Account is already excluded");
if(_rOwned[account] > 0) {
_tOwned[account] = tokenFromReflection(_rOwned[account]);
}
_isExcluded[account] = true;
_excluded.push(account);
}
function includeAccount(address account) external onlyOwner() {
require(_isExcluded[account], "Ouroboros: Account is already included");
for (uint256 i = 0; i < _excluded.length; i++) {
if (_excluded[i] == account) {
_excluded[i] = _excluded[_excluded.length - 1];
_tOwned[account] = 0;
_isExcluded[account] = false;
_excluded.pop();
break;
}
}
}
function _approve(address owner, address spender, uint256 amount) private {
require(owner != address(0), "Ouroboros: approve from the zero address");
require(spender != address(0), "Ouroboros: approve to the zero address");
_allowances[owner][spender] = amount;
emit Approval(owner, spender, amount);
}
function _transfer(address sender, address recipient, uint256 amount) private {
require(sender != address(0), "Ouroboros: transfer from the zero address");
require(recipient != address(0), "Ouroboros: transfer to the zero address");
require(amount > 0, "Ouroboros: Transfer amount must be greater than zero");
if(sender != owner() && recipient != owner() && !inSwapAndLiquify) {
require(amount <= _maxTxAmount, "Ouroboros: Transfer amount exceeds the maxTxAmount.");
if((_msgSender() == currentPoolAddress || _msgSender() == address(_uniswapV2Router)) && !tradingEnabled)
require(false, "Ouroboros: trading is disabled.");
}
if(!inSwapAndLiquify) {
uint256 lockedBalanceForPool = balanceOf(address(this));
bool overMinTokenBalance = lockedBalanceForPool >= _minTokensBeforeSwap;
if (
overMinTokenBalance &&
msg.sender != currentPoolAddress &&
swapAndLiquifyEnabled
) {
if(currentPairTokenAddress == _uniswapV2Router.WETH())
swapAndLiquifyForEth(lockedBalanceForPool);
else
swapAndLiquifyForTokens(currentPairTokenAddress, lockedBalanceForPool);
}
}
if (_isExcluded[sender] && !_isExcluded[recipient]) {
_transferFromExcluded(sender, recipient, amount);
} else if (!_isExcluded[sender] && _isExcluded[recipient]) {
_transferToExcluded(sender, recipient, amount);
} else if (!_isExcluded[sender] && !_isExcluded[recipient]) {
_transferStandard(sender, recipient, amount);
} else if (_isExcluded[sender] && _isExcluded[recipient]) {
_transferBothExcluded(sender, recipient, amount);
} else {
_transferStandard(sender, recipient, amount);
}
}
receive() external payable {}
function swapAndLiquifyForEth(uint256 lockedBalanceForPool) private lockTheSwap {
// split the contract balance except swapCallerFee into halves
uint256 lockedForSwap = lockedBalanceForPool.sub(_autoSwapCallerFee);
uint256 half = lockedForSwap.div(2);
uint256 otherHalf = lockedForSwap.sub(half);
// capture the contract's current ETH balance.
// this is so that we can capture exactly the amount of ETH that the
// swap creates, and not make the liquidity event include any ETH that
// has been manually sent to the contract
uint256 initialBalance = address(this).balance;
// swap tokens for ETH
swapTokensForEth(half);
// how much ETH did we just swap into?
uint256 newBalance = address(this).balance.sub(initialBalance);
// add liquidity to uniswap
addLiquidityForEth(otherHalf, newBalance);
emit SwapAndLiquify(_uniswapV2Router.WETH(), half, newBalance, otherHalf);
_transfer(address(this), tx.origin, _autoSwapCallerFee);
}
function swapTokensForEth(uint256 tokenAmount) private {
// generate the uniswap pair path of token -> weth
address[] memory path = new address[](2);
path[0] = address(this);
path[1] = _uniswapV2Router.WETH();
_approve(address(this), address(_uniswapV2Router), tokenAmount);
// make the swap
_uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
tokenAmount,
0, // accept any amount of ETH
path,
address(this),
block.timestamp
);
}
function addLiquidityForEth(uint256 tokenAmount, uint256 ethAmount) private {
// approve token transfer to cover all possible scenarios
_approve(address(this), address(_uniswapV2Router), tokenAmount);
// add the liquidity
_uniswapV2Router.addLiquidityETH{value: ethAmount}(
address(this),
tokenAmount,
0, // slippage is unavoidable
0, // slippage is unavoidable
address(this),
block.timestamp
);
}
function swapAndLiquifyForTokens(address pairTokenAddress, uint256 lockedBalanceForPool) private lockTheSwap {
// split the contract balance except swapCallerFee into halves
uint256 lockedForSwap = lockedBalanceForPool.sub(_autoSwapCallerFee);
uint256 half = lockedForSwap.div(2);
uint256 otherHalf = lockedForSwap.sub(half);
_transfer(address(this), address(swaper), half);
uint256 initialPairTokenBalance = IERC20(pairTokenAddress).balanceOf(address(this));
// swap tokens for pairToken
swaper.swapTokens(pairTokenAddress, half);
uint256 newPairTokenBalance = IERC20(pairTokenAddress).balanceOf(address(this)).sub(initialPairTokenBalance);
// add liquidity to uniswap
addLiquidityForTokens(pairTokenAddress, otherHalf, newPairTokenBalance);
emit SwapAndLiquify(pairTokenAddress, half, newPairTokenBalance, otherHalf);
_transfer(address(this), tx.origin, _autoSwapCallerFee);
}
function addLiquidityForTokens(address pairTokenAddress, uint256 tokenAmount, uint256 pairTokenAmount) private {
// approve token transfer to cover all possible scenarios
_approve(address(this), address(_uniswapV2Router), tokenAmount);
IERC20(pairTokenAddress).approve(address(_uniswapV2Router), pairTokenAmount);
// add the liquidity
_uniswapV2Router.addLiquidity(
address(this),
pairTokenAddress,
tokenAmount,
pairTokenAmount,
0, // slippage is unavoidable
0, // slippage is unavoidable
address(this),
block.timestamp
);
}
function alchemy() public lockTheSwap {
require(_msgSender() == owner());
require(now > _lastAlchemy + _alchemyInterval, 'Ouroboros: Too Soon.');
_lastAlchemy = now;
uint256 amountToRemove = IERC20(_uniswapETHPool).balanceOf(address(this)).mul(_liquidityRemoveFee).div(100);
removeLiquidityETH(amountToRemove);
balancer.rebalance();
uint256 tNewTokenBalance = balanceOf(address(balancer));
uint256 tRewardForCaller = tNewTokenBalance.mul(_alchemyCallerFee).div(100);
uint256 tBurn = tNewTokenBalance.sub(tRewardForCaller);
uint256 currentRate = _getRate();
uint256 rBurn = tBurn.mul(currentRate);
_rOwned[_msgSender()] = _rOwned[_msgSender()].add(tRewardForCaller.mul(currentRate));
_rOwned[address(balancer)] = 0;
_tBurnTotal = _tBurnTotal.add(tBurn);
_tTotal = _tTotal.sub(tBurn);
_rTotal = _rTotal.sub(rBurn);
emit Transfer(address(balancer), _msgSender(), tRewardForCaller);
emit Transfer(address(balancer), address(0), tBurn);
emit Rebalance(tBurn);
}
function removeLiquidityETH(uint256 lpAmount) private returns(uint ETHAmount) {
IERC20(_uniswapETHPool).approve(address(_uniswapV2Router), lpAmount);
(ETHAmount) = _uniswapV2Router
.removeLiquidityETHSupportingFeeOnTransferTokens(
address(this),
lpAmount,
0,
0,
address(balancer),
block.timestamp
);
}
function _transferStandard(address sender, address recipient, uint256 tAmount) private {
uint256 currentRate = _getRate();
(uint256 rAmount, uint256 rTransferAmount, uint256 rFee, uint256 tTransferAmount, uint256 tFee, uint256 tLock) = _getValues(tAmount);
uint256 rLock = tLock.mul(currentRate);
_rOwned[sender] = _rOwned[sender].sub(rAmount);
if(inSwapAndLiquify) {
_rOwned[recipient] = _rOwned[recipient].add(rAmount);
emit Transfer(sender, recipient, tAmount);
} else {
_rOwned[recipient] = _rOwned[recipient].add(rTransferAmount);
_rOwned[address(this)] = _rOwned[address(this)].add(rLock);
_reflectFee(rFee, tFee);
emit Transfer(sender, address(this), tLock);
emit Transfer(sender, recipient, tTransferAmount);
}
}
function _transferToExcluded(address sender, address recipient, uint256 tAmount) private {
uint256 currentRate = _getRate();
(uint256 rAmount, uint256 rTransferAmount, uint256 rFee, uint256 tTransferAmount, uint256 tFee, uint256 tLock) = _getValues(tAmount);
uint256 rLock = tLock.mul(currentRate);
_rOwned[sender] = _rOwned[sender].sub(rAmount);
if(inSwapAndLiquify) {
_tOwned[recipient] = _tOwned[recipient].add(tAmount);
_rOwned[recipient] = _rOwned[recipient].add(rAmount);
emit Transfer(sender, recipient, tAmount);
} else {
_tOwned[recipient] = _tOwned[recipient].add(tTransferAmount);
_rOwned[recipient] = _rOwned[recipient].add(rTransferAmount);
_rOwned[address(this)] = _rOwned[address(this)].add(rLock);
_reflectFee(rFee, tFee);
emit Transfer(sender, address(this), tLock);
emit Transfer(sender, recipient, tTransferAmount);
}
}
function _transferFromExcluded(address sender, address recipient, uint256 tAmount) private {
uint256 currentRate = _getRate();
(uint256 rAmount, uint256 rTransferAmount, uint256 rFee, uint256 tTransferAmount, uint256 tFee, uint256 tLock) = _getValues(tAmount);
uint256 rLock = tLock.mul(currentRate);
_tOwned[sender] = _tOwned[sender].sub(tAmount);
_rOwned[sender] = _rOwned[sender].sub(rAmount);
if(inSwapAndLiquify) {
_rOwned[recipient] = _rOwned[recipient].add(rAmount);
emit Transfer(sender, recipient, tAmount);
} else {
_rOwned[recipient] = _rOwned[recipient].add(rTransferAmount);
_rOwned[address(this)] = _rOwned[address(this)].add(rLock);
_reflectFee(rFee, tFee);
emit Transfer(sender, address(this), tLock);
emit Transfer(sender, recipient, tTransferAmount);
}
}
function _transferBothExcluded(address sender, address recipient, uint256 tAmount) private {
uint256 currentRate = _getRate();
(uint256 rAmount, uint256 rTransferAmount, uint256 rFee, uint256 tTransferAmount, uint256 tFee, uint256 tLock) = _getValues(tAmount);
uint256 rLock = tLock.mul(currentRate);
_tOwned[sender] = _tOwned[sender].sub(tAmount);
_rOwned[sender] = _rOwned[sender].sub(rAmount);
if(inSwapAndLiquify) {
_tOwned[recipient] = _tOwned[recipient].add(tAmount);
_rOwned[recipient] = _rOwned[recipient].add(rAmount);
emit Transfer(sender, recipient, tAmount);
}
else {
_tOwned[recipient] = _tOwned[recipient].add(tTransferAmount);
_rOwned[recipient] = _rOwned[recipient].add(rTransferAmount);
_rOwned[address(this)] = _rOwned[address(this)].add(rLock);
_reflectFee(rFee, tFee);
emit Transfer(sender, address(this), tLock);
emit Transfer(sender, recipient, tTransferAmount);
}
}
function _reflectFee(uint256 rFee, uint256 tFee) private {
_rTotal = _rTotal.sub(rFee);
_tFeeTotal = _tFeeTotal.add(tFee);
}
function _getValues(uint256 tAmount) private view returns (uint256, uint256, uint256, uint256, uint256, uint256) {
(uint256 tTransferAmount, uint256 tFee, uint256 tLock) = _getTValues(tAmount, _taxFee, _lockFee, _feeDecimals);
uint256 currentRate = _getRate();
(uint256 rAmount, uint256 rTransferAmount, uint256 rFee) = _getRValues(tAmount, tFee, tLock, currentRate);
return (rAmount, rTransferAmount, rFee, tTransferAmount, tFee, tLock);
}
function _getTValues(uint256 tAmount, uint256 taxFee, uint256 lockFee, uint256 feeDecimals) private pure returns (uint256, uint256, uint256) {
uint256 tFee = tAmount.mul(taxFee).div(10**(feeDecimals + 2));
uint256 tLockFee = tAmount.mul(lockFee).div(10**(feeDecimals + 2));
uint256 tTransferAmount = tAmount.sub(tFee).sub(tLockFee);
return (tTransferAmount, tFee, tLockFee);
}
function _getRValues(uint256 tAmount, uint256 tFee, uint256 tLock, uint256 currentRate) private pure returns (uint256, uint256, uint256) {
uint256 rAmount = tAmount.mul(currentRate);
uint256 rFee = tFee.mul(currentRate);
uint256 rLock = tLock.mul(currentRate);
uint256 rTransferAmount = rAmount.sub(rFee).sub(rLock);
return (rAmount, rTransferAmount, rFee);
}
function _getRate() public view returns(uint256) {
(uint256 rSupply, uint256 tSupply) = _getCurrentSupply();
return rSupply.div(tSupply);
}
function _getCurrentSupply() public view returns(uint256, uint256) {
uint256 rSupply = _rTotal;
uint256 tSupply = _tTotal;
for (uint256 i = 0; i < _excluded.length; i++) {
if (_rOwned[_excluded[i]] > rSupply || _tOwned[_excluded[i]] > tSupply) return (_rTotal, _tTotal);
rSupply = rSupply.sub(_rOwned[_excluded[i]]);
tSupply = tSupply.sub(_tOwned[_excluded[i]]);
}
if (rSupply < _rTotal.div(_tTotal)) return (_rTotal, _tTotal);
return (rSupply, tSupply);
}
function getCurrentPoolAddress() public view returns(address) {
return currentPoolAddress;
}
function getCurrentPairTokenAddress() public view returns(address) {
return currentPairTokenAddress;
}
function getLiquidityRemoveFee() public view returns(uint256) {
return _liquidityRemoveFee;
}
function getAlchemyCallerFee() public view returns(uint256) {
return _alchemyCallerFee;
}
function getLastAlchemy() public view returns(uint256) {
return _lastAlchemy;
}
function getAlchemyInterval() public view returns(uint256) {
return _alchemyInterval;
}
function _setFeeDecimals(uint256 feeDecimals) external onlyOwner() {
require(feeDecimals >= 0 && feeDecimals <= 2, 'Ouroboros: fee decimals should be in 0 - 2');
_feeDecimals = feeDecimals;
emit FeeDecimalsUpdated(feeDecimals);
}
function _setTaxFee(uint256 taxFee) external onlyOwner() {
require(taxFee >= 0 && taxFee <= 5 * 10 ** _feeDecimals, 'Ouroboros: taxFee should be in 0 - 5');
_taxFee = taxFee;
emit TaxFeeUpdated(taxFee);
}
function _setLockFee(uint256 lockFee) external onlyOwner() {
require(lockFee >= 0 && lockFee <= 5 * 10 ** _feeDecimals, 'Ouroboros: lockFee should be in 0 - 5');
_lockFee = lockFee;
emit LockFeeUpdated(lockFee);
}
function _setMaxTxAmount(uint256 maxTxAmount) external onlyOwner() {
require(maxTxAmount >= 500000e9 , 'Ouroboros: maxTxAmount should be greater than 500000e9');
_maxTxAmount = maxTxAmount;
emit MaxTxAmountUpdated(maxTxAmount);
}
function _setMinTokensBeforeSwap(uint256 minTokensBeforeSwap) external onlyOwner() {
require(minTokensBeforeSwap >= 50e9 && minTokensBeforeSwap <= 25000e9 , 'Ouroboros: minTokenBeforeSwap should be in 50e9 - 25000e9');
require(minTokensBeforeSwap > _autoSwapCallerFee , 'Ouroboros: minTokenBeforeSwap should be greater than autoSwapCallerFee');
_minTokensBeforeSwap = minTokensBeforeSwap;
emit MinTokensBeforeSwapUpdated(minTokensBeforeSwap);
}
function _setAutoSwapCallerFee(uint256 autoSwapCallerFee) external onlyOwner() {
require(autoSwapCallerFee >= 1e9, 'Ouroboros: autoSwapCallerFee should be greater than 1e9');
_autoSwapCallerFee = autoSwapCallerFee;
emit AutoSwapCallerFeeUpdated(autoSwapCallerFee);
}
function _setLiquidityRemoveFee(uint256 liquidityRemoveFee) external onlyOwner() {
require(liquidityRemoveFee >= 1 && liquidityRemoveFee <= 10 , 'Ouroboros: liquidityRemoveFee should be in 1 - 10');
_liquidityRemoveFee = liquidityRemoveFee;
emit LiquidityRemoveFeeUpdated(liquidityRemoveFee);
}
function _setAlchemyCallerFee(uint256 alchemyCallerFee) external onlyOwner() {
require(alchemyCallerFee >= 1 && alchemyCallerFee <= 15 , 'Ouroboros: alchemyCallerFee should be in 1 - 15');
_alchemyCallerFee = alchemyCallerFee;
emit AlchemyCallerFeeUpdated(alchemyCallerFee);
}
function _setAlchemyInterval(uint256 alchemyInterval) external onlyOwner() {
_alchemyInterval = alchemyInterval;
emit AlchemyIntervalUpdated(alchemyInterval);
}
function updateSwapAndLiquifyEnabled(bool _enabled) public onlyOwner {
swapAndLiquifyEnabled = _enabled;
emit SwapAndLiquifyEnabledUpdated(_enabled);
}
function _updateWhitelist(address poolAddress, address pairTokenAddress) public onlyOwner() {
require(poolAddress != address(0), "Ouroboros: Pool address is zero.");
require(pairTokenAddress != address(0), "Ouroboros: Pair token address is zero.");
require(pairTokenAddress != address(this), "Ouroboros: Pair token address self address.");
require(pairTokenAddress != currentPairTokenAddress, "Ouroboros: Pair token address is same as current one.");
currentPoolAddress = poolAddress;
currentPairTokenAddress = pairTokenAddress;
emit WhitelistUpdated(pairTokenAddress);
}
function _enableTrading() external onlyOwner() {
tradingEnabled = true;
TradingEnabled();
}
}