Warning! Contract bytecode has been changed and doesn't match the verified one. Therefore, interaction with this smart contract may be risky.
- Contract name:
- Presale
- Optimization enabled
- true
- Compiler version
- v0.8.19+commit.7dd6d404
- Optimization runs
- 200
- EVM Version
- default
- Verified at
- 2024-02-16T01:01:21.059849Z
Constructor Arguments
0x00000000000000000000000020f72dcf9141e1b6014c835b6d0709e32d806f10
Arg [0] (address) : 0x20f72dcf9141e1b6014c835b6d0709e32d806f10
contracts/Presale.sol
// SPDX-License-Identifier: MIT
// File @openzeppelin/contracts/token/ERC20/IERC20.sol@v4.8.0
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)
pragma solidity 0.8.19;
/**
* @dev Interface of the ERC20 standard as defined in the EIP.
*/
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 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 'to'.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transfer(address to, 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 'from' to 'to' 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 from,
address to,
uint256 amount
) external returns (bool);
}
// File @openzeppelin/contracts/utils/Context.sol@v4.8.0
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)
/**
* @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 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) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes calldata) {
return msg.data;
}
}
// File @openzeppelin/contracts/access/Ownable.sol@v4.8.0
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)
/**
* @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.
*/
abstract 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() {
_transferOwnership(_msgSender());
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
_checkOwner();
_;
}
/**
* @dev Returns the address of the current owner.
*/
function owner() public view virtual returns (address) {
return _owner;
}
/**
* @dev Throws if the sender is not the owner.
*/
function _checkOwner() internal view virtual {
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 {
_transferOwnership(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"
);
_transferOwnership(newOwner);
}
/**
* @dev Transfers ownership of the contract to a new account ('newOwner').
* Internal function without access restriction.
*/
function _transferOwnership(address newOwner) internal virtual {
address oldOwner = _owner;
_owner = newOwner;
emit OwnershipTransferred(oldOwner, newOwner);
}
}
contract Presale is Ownable {
uint256 public tokenPrice = 7777 ether; // price of each token in ETH
// uint256 public hardCap = 49772800 ether; // hard cap in ETH
uint256 public hardCap = 7777 ether; // hard cap in ETH
uint256 public filled = 0 ether; // hard cap in ETH
address public tokenAddress; // address of the token contract
mapping(address => uint256) public tokenBalances; // keep track of the number of tokens each address holds
mapping(address => uint256) public invested; // keep track of the amount of ETH each address has invested
mapping(address => bool) public is_buyer; // mapping for checking if an address has bought tokens
event TokenPurchase(address indexed buyer, uint256 amount); // emit an event when tokens are purchased
event Claim(address indexed buyer, uint256 amount); // emit an event when tokens are claimed
constructor(address _tokenAddress) {
tokenAddress = _tokenAddress;
}
receive() external payable {}
function setTokenPrice(uint256 _tokenPrice) public onlyOwner {
tokenPrice = _tokenPrice;
}
function setTokenAddress(address _tokenAddress) public onlyOwner {
tokenAddress = _tokenAddress;
}
function buyTokens() public payable {
require(
is_buyer[msg.sender] == false,
"You have already bought tokens"
);
require(msg.value == 7777 ether, "Wrong amount of ETH sent");
uint256 amount = (msg.value / tokenPrice) * 10 ** 18;
tokenBalances[msg.sender] += amount;
invested[msg.sender] += msg.value;
is_buyer[msg.sender] = true;
filled += msg.value;
emit TokenPurchase(msg.sender, amount);
}
function claimTokens() public {
require(filled >= hardCap, "Claim is not yet enabled");
uint256 amount = tokenBalances[msg.sender];
require(amount > 0, "not have tokens to claim");
tokenBalances[msg.sender] = 0;
IERC20(tokenAddress).transfer(msg.sender, amount);
emit Claim(msg.sender, amount);
}
// function to withdraw ETH from the contract
function withdraw() public onlyOwner {
(bool success, ) = payable(owner()).call{value: address(this).balance}(
""
);
require(success, "Transfer failed.");
}
// function to withdraw ERC20 tokens from the contract
function withdrawToken() public onlyOwner {
IERC20 token = IERC20(tokenAddress);
uint256 balance = token.balanceOf(address(this));
token.transfer(owner(), balance);
}
}
Compiler Settings
{"outputSelection":{"*":{"*":["*"],"":["*"]}},"optimizer":{"runs":200,"enabled":true},"libraries":{}}
Contract ABI
[{"type":"constructor","stateMutability":"nonpayable","inputs":[{"type":"address","name":"_tokenAddress","internalType":"address"}]},{"type":"event","name":"Claim","inputs":[{"type":"address","name":"buyer","internalType":"address","indexed":true},{"type":"uint256","name":"amount","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"OwnershipTransferred","inputs":[{"type":"address","name":"previousOwner","internalType":"address","indexed":true},{"type":"address","name":"newOwner","internalType":"address","indexed":true}],"anonymous":false},{"type":"event","name":"TokenPurchase","inputs":[{"type":"address","name":"buyer","internalType":"address","indexed":true},{"type":"uint256","name":"amount","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"function","stateMutability":"payable","outputs":[],"name":"buyTokens","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"claimTokens","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"filled","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"hardCap","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"invested","inputs":[{"type":"address","name":"","internalType":"address"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"is_buyer","inputs":[{"type":"address","name":"","internalType":"address"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address"}],"name":"owner","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"renounceOwnership","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"setTokenAddress","inputs":[{"type":"address","name":"_tokenAddress","internalType":"address"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"setTokenPrice","inputs":[{"type":"uint256","name":"_tokenPrice","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address"}],"name":"tokenAddress","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"tokenBalances","inputs":[{"type":"address","name":"","internalType":"address"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"tokenPrice","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"transferOwnership","inputs":[{"type":"address","name":"newOwner","internalType":"address"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"withdraw","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"withdrawToken","inputs":[]},{"type":"receive","stateMutability":"payable"}]
Contract Creation Code
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ByteCode
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