Description:
Multi-signature wallet contract requiring multiple confirmations for transaction execution.
Blockchain: Ethereum
Source Code: View Code On The Blockchain
Solidity Source Code:
// File: @openzeppelin/contracts/token/ERC20/IERC20.sol
// OpenZeppelin Contracts (last updated v5.4.0) (token/ERC20/IERC20.sol)
pragma solidity >=0.4.16;
/**
* @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);
}
// File: @openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol
// OpenZeppelin Contracts (last updated v5.4.0) (token/ERC20/extensions/IERC20Metadata.sol)
pragma solidity >=0.6.2;
/**
* @dev Interface for the optional metadata functions from the ERC-20 standard.
*/
interface IERC20Metadata is IERC20 {
/**
* @dev Returns the name of the token.
*/
function name() external view returns (string memory);
/**
* @dev Returns the symbol of the token.
*/
function symbol() external view returns (string memory);
/**
* @dev Returns the decimals places of the token.
*/
function decimals() external view returns (uint8);
}
// File: @openzeppelin/contracts/interfaces/IERC20.sol
// OpenZeppelin Contracts (last updated v5.4.0) (interfaces/IERC20.sol)
pragma solidity >=0.4.16;
// File: @openzeppelin/contracts/utils/introspection/IERC165.sol
// OpenZeppelin Contracts (last updated v5.4.0) (utils/introspection/IERC165.sol)
pragma solidity >=0.4.16;
/**
* @dev Interface of the ERC-165 standard, as defined in the
* https://eips.ethereum.org/EIPS/eip-165[ERC].
*
* Implementers can declare support of contract interfaces, which can then be
* queried by others ({ERC165Checker}).
*
* For an implementation, see {ERC165}.
*/
interface IERC165 {
/**
* @dev Returns true if this contract implements the interface defined by
* `interfaceId`. See the corresponding
* https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[ERC section]
* to learn more about how these ids are created.
*
* This function call must use less than 30 000 gas.
*/
function supportsInterface(bytes4 interfaceId) external view returns (bool);
}
// File: @openzeppelin/contracts/interfaces/IERC165.sol
// OpenZeppelin Contracts (last updated v5.4.0) (interfaces/IERC165.sol)
pragma solidity >=0.4.16;
// File: @openzeppelin/contracts/interfaces/IERC1363.sol
// OpenZeppelin Contracts (last updated v5.4.0) (interfaces/IERC1363.sol)
pragma solidity >=0.6.2;
/**
* @title IERC1363
* @dev Interface of the ERC-1363 standard as defined in the https://eips.ethereum.org/EIPS/eip-1363[ERC-1363].
*
* Defines an extension interface for ERC-20 tokens that supports executing code on a recipient contract
* after `transfer` or `transferFrom`, or code on a spender contract after `approve`, in a single transaction.
*/
interface IERC1363 is IERC20, IERC165 {
/*
* Note: the ERC-165 identifier for this interface is 0xb0202a11.
* 0xb0202a11 ===
* bytes4(keccak256('transferAndCall(address,uint256)')) ^
* bytes4(keccak256('transferAndCall(address,uint256,bytes)')) ^
* bytes4(keccak256('transferFromAndCall(address,address,uint256)')) ^
* bytes4(keccak256('transferFromAndCall(address,address,uint256,bytes)')) ^
* bytes4(keccak256('approveAndCall(address,uint256)')) ^
* bytes4(keccak256('approveAndCall(address,uint256,bytes)'))
*/
/**
* @dev Moves a `value` amount of tokens from the caller's account to `to`
* and then calls {IERC1363Receiver-onTransferReceived} on `to`.
* @param to The address which you want to transfer to.
* @param value The amount of tokens to be transferred.
* @return A boolean value indicating whether the operation succeeded unless throwing.
*/
function transferAndCall(address to, uint256 value) external returns (bool);
/**
* @dev Moves a `value` amount of tokens from the caller's account to `to`
* and then calls {IERC1363Receiver-onTransferReceived} on `to`.
* @param to The address which you want to transfer to.
* @param value The amount of tokens to be transferred.
* @param data Additional data with no specified format, sent in call to `to`.
* @return A boolean value indicating whether the operation succeeded unless throwing.
*/
function transferAndCall(address to, uint256 value, bytes calldata data) external returns (bool);
/**
* @dev Moves a `value` amount of tokens from `from` to `to` using the allowance mechanism
* and then calls {IERC1363Receiver-onTransferReceived} on `to`.
* @param from The address which you want to send tokens from.
* @param to The address which you want to transfer to.
* @param value The amount of tokens to be transferred.
* @return A boolean value indicating whether the operation succeeded unless throwing.
*/
function transferFromAndCall(address from, address to, uint256 value) external returns (bool);
/**
* @dev Moves a `value` amount of tokens from `from` to `to` using the allowance mechanism
* and then calls {IERC1363Receiver-onTransferReceived} on `to`.
* @param from The address which you want to send tokens from.
* @param to The address which you want to transfer to.
* @param value The amount of tokens to be transferred.
* @param data Additional data with no specified format, sent in call to `to`.
* @return A boolean value indicating whether the operation succeeded unless throwing.
*/
function transferFromAndCall(address from, address to, uint256 value, bytes calldata data) external returns (bool);
/**
* @dev Sets a `value` amount of tokens as the allowance of `spender` over the
* caller's tokens and then calls {IERC1363Spender-onApprovalReceived} on `spender`.
* @param spender The address which will spend the funds.
* @param value The amount of tokens to be spent.
* @return A boolean value indicating whether the operation succeeded unless throwing.
*/
function approveAndCall(address spender, uint256 value) external returns (bool);
/**
* @dev Sets a `value` amount of tokens as the allowance of `spender` over the
* caller's tokens and then calls {IERC1363Spender-onApprovalReceived} on `spender`.
* @param spender The address which will spend the funds.
* @param value The amount of tokens to be spent.
* @param data Additional data with no specified format, sent in call to `spender`.
* @return A boolean value indicating whether the operation succeeded unless throwing.
*/
function approveAndCall(address spender, uint256 value, bytes calldata data) external returns (bool);
}
// File: @openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol
// OpenZeppelin Contracts (last updated v5.3.0) (token/ERC20/utils/SafeERC20.sol)
pragma solidity ^0.8.20;
/**
* @title SafeERC20
* @dev Wrappers around ERC-20 operations that throw on failure (when the token
* contract returns false). Tokens that return no value (and instead revert or
* throw on failure) are also supported, non-reverting calls are assumed to be
* successful.
* To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
* which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
*/
library SafeERC20 {
/**
* @dev An operation with an ERC-20 token failed.
*/
error SafeERC20FailedOperation(address token);
/**
* @dev Indicates a failed `decreaseAllowance` request.
*/
error SafeERC20FailedDecreaseAllowance(address spender, uint256 currentAllowance, uint256 requestedDecrease);
/**
* @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
* non-reverting calls are assumed to be successful.
*/
function safeTransfer(IERC20 token, address to, uint256 value) internal {
_callOptionalReturn(token, abi.encodeCall(token.transfer, (to, value)));
}
/**
* @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
* calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
*/
function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
_callOptionalReturn(token, abi.encodeCall(token.transferFrom, (from, to, value)));
}
/**
* @dev Variant of {safeTransfer} that returns a bool instead of reverting if the operation is not successful.
*/
function trySafeTransfer(IERC20 token, address to, uint256 value) internal returns (bool) {
return _callOptionalReturnBool(token, abi.encodeCall(token.transfer, (to, value)));
}
/**
* @dev Variant of {safeTransferFrom} that returns a bool instead of reverting if the operation is not successful.
*/
function trySafeTransferFrom(IERC20 token, address from, address to, uint256 value) internal returns (bool) {
return _callOptionalReturnBool(token, abi.encodeCall(token.transferFrom, (from, to, value)));
}
/**
* @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
* non-reverting calls are assumed to be successful.
*
* IMPORTANT: If the token implements ERC-7674 (ERC-20 with temporary allowance), and if the "client"
* smart contract uses ERC-7674 to set temporary allowances, then the "client" smart contract should avoid using
* this function. Performing a {safeIncreaseAllowance} or {safeDecreaseAllowance} operation on a token contract
* that has a non-zero temporary allowance (for that particular owner-spender) will result in unexpected behavior.
*/
function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
uint256 oldAllowance = token.allowance(address(this), spender);
forceApprove(token, spender, oldAllowance + value);
}
/**
* @dev Decrease the calling contract's allowance toward `spender` by `requestedDecrease`. If `token` returns no
* value, non-reverting calls are assumed to be successful.
*
* IMPORTANT: If the token implements ERC-7674 (ERC-20 with temporary allowance), and if the "client"
* smart contract uses ERC-7674 to set temporary allowances, then the "client" smart contract should avoid using
* this function. Performing a {safeIncreaseAllowance} or {safeDecreaseAllowance} operation on a token contract
* that has a non-zero temporary allowance (for that particular owner-spender) will result in unexpected behavior.
*/
function safeDecreaseAllowance(IERC20 token, address spender, uint256 requestedDecrease) internal {
unchecked {
uint256 currentAllowance = token.allowance(address(this), spender);
if (currentAllowance < requestedDecrease) {
revert SafeERC20FailedDecreaseAllowance(spender, currentAllowance, requestedDecrease);
}
forceApprove(token, spender, currentAllowance - requestedDecrease);
}
}
/**
* @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
* non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
* to be set to zero before setting it to a non-zero value, such as USDT.
*
* NOTE: If the token implements ERC-7674, this function will not modify any temporary allowance. This function
* only sets the "standard" allowance. Any temporary allowance will remain active, in addition to the value being
* set here.
*/
function forceApprove(IERC20 token, address spender, uint256 value) internal {
bytes memory approvalCall = abi.encodeCall(token.approve, (spender, value));
if (!_callOptionalReturnBool(token, approvalCall)) {
_callOptionalReturn(token, abi.encodeCall(token.approve, (spender, 0)));
_callOptionalReturn(token, approvalCall);
}
}
/**
* @dev Performs an {ERC1363} transferAndCall, with a fallback to the simple {ERC20} transfer if the target has no
* code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
* targeting contracts.
*
* Reverts if the returned value is other than `true`.
*/
function transferAndCallRelaxed(IERC1363 token, address to, uint256 value, bytes memory data) internal {
if (to.code.length == 0) {
safeTransfer(token, to, value);
} else if (!token.transferAndCall(to, value, data)) {
revert SafeERC20FailedOperation(address(token));
}
}
/**
* @dev Performs an {ERC1363} transferFromAndCall, with a fallback to the simple {ERC20} transferFrom if the target
* has no code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
* targeting contracts.
*
* Reverts if the returned value is other than `true`.
*/
function transferFromAndCallRelaxed(
IERC1363 token,
address from,
address to,
uint256 value,
bytes memory data
) internal {
if (to.code.length == 0) {
safeTransferFrom(token, from, to, value);
} else if (!token.transferFromAndCall(from, to, value, data)) {
revert SafeERC20FailedOperation(address(token));
}
}
/**
* @dev Performs an {ERC1363} approveAndCall, with a fallback to the simple {ERC20} approve if the target has no
* code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
* targeting contracts.
*
* NOTE: When the recipient address (`to`) has no code (i.e. is an EOA), this function behaves as {forceApprove}.
* Opposedly, when the recipient address (`to`) has code, this function only attempts to call {ERC1363-approveAndCall}
* once without retrying, and relies on the returned value to be true.
*
* Reverts if the returned value is other than `true`.
*/
function approveAndCallRelaxed(IERC1363 token, address to, uint256 value, bytes memory data) internal {
if (to.code.length == 0) {
forceApprove(token, to, value);
} else if (!token.approveAndCall(to, value, data)) {
revert SafeERC20FailedOperation(address(token));
}
}
/**
* @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
* on the return value: the return value is optional (but if data is returned, it must not be false).
* @param token The token targeted by the call.
* @param data The call data (encoded using abi.encode or one of its variants).
*
* This is a variant of {_callOptionalReturnBool} that reverts if call fails to meet the requirements.
*/
function _callOptionalReturn(IERC20 token, bytes memory data) private {
uint256 returnSize;
uint256 returnValue;
assembly ("memory-safe") {
let success := call(gas(), token, 0, add(data, 0x20), mload(data), 0, 0x20)
// bubble errors
if iszero(success) {
let ptr := mload(0x40)
returndatacopy(ptr, 0, returndatasize())
revert(ptr, returndatasize())
}
returnSize := returndatasize()
returnValue := mload(0)
}
if (returnSize == 0 ? address(token).code.length == 0 : returnValue != 1) {
revert SafeERC20FailedOperation(address(token));
}
}
/**
* @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
* on the return value: the return value is optional (but if data is returned, it must not be false).
* @param token The token targeted by the call.
* @param data The call data (encoded using abi.encode or one of its variants).
*
* This is a variant of {_callOptionalReturn} that silently catches all reverts and returns a bool instead.
*/
function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
bool success;
uint256 returnSize;
uint256 returnValue;
assembly ("memory-safe") {
success := call(gas(), token, 0, add(data, 0x20), mload(data), 0, 0x20)
returnSize := returndatasize()
returnValue := mload(0)
}
return success && (returnSize == 0 ? address(token).code.length > 0 : returnValue == 1);
}
}
// File: @openzeppelin/contracts/utils/Context.sol
// OpenZeppelin Contracts (last updated v5.0.1) (utils/Context.sol)
pragma solidity ^0.8.20;
/**
* @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;
}
function _contextSuffixLength() internal view virtual returns (uint256) {
return 0;
}
}
// File: @openzeppelin/contracts/access/Ownable.sol
// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable.sol)
pragma solidity ^0.8.20;
/**
* @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.
*
* The initial owner is set to the address provided by the deployer. 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;
/**
* @dev The caller account is not authorized to perform an operation.
*/
error OwnableUnauthorizedAccount(address account);
/**
* @dev The owner is not a valid owner account. (eg. `address(0)`)
*/
error OwnableInvalidOwner(address owner);
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
* @dev Initializes the contract setting the address provided by the deployer as the initial owner.
*/
constructor(address initialOwner) {
if (initialOwner == address(0)) {
revert OwnableInvalidOwner(address(0));
}
_transferOwnership(initialOwner);
}
/**
* @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 {
if (owner() != _msgSender()) {
revert OwnableUnauthorizedAccount(_msgSender());
}
}
/**
* @dev Leaves the contract without owner. It will not be possible to call
* `onlyOwner` functions. Can only be called by the current owner.
*
* NOTE: Renouncing ownership will leave the contract without an owner,
* thereby disabling 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 {
if (newOwner == address(0)) {
revert OwnableInvalidOwner(address(0));
}
_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);
}
}
// File: @openzeppelin/contracts/security/ReentrancyGuard.sol
// 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;
}
}
// File: contracts/ethpresale.sol
pragma solidity ^0.8.21;
/*
* Direct Presale (ETH + USDT) -> Instant Delivery from storage wallet
*
* - Buyers can pay with ETH (msg.value) or USDT (ERC20).
* - Tokens are transferred immediately from storageWallet -> buyer via transferFrom (requires approve).
* - ETH is forwarded to treasury; USDT is sent to treasury.
* - Separate prices: priceETH (tokens per 1 ETH) & priceUSDT (tokens per 1 USDT).
* - Owner can update: priceETH, priceUSDT, treasury, storageWallet, usdt token, limits, whitelist, times.
* - Hard cap tokensForSale; safe partial-fill + refund (ETH).
*/
contract DirectPresaleETH_USDT is Ownable, ReentrancyGuard {
using SafeERC20 for IERC20;
// Core tokens
IERC20 public immutable token; // your token to sell
uint8 public immutable tokenDecimals;
IERC20 public usdt; // payment token (configurable)
uint8 public usdtDecimals;
// Wallets
address public storageWallet; // holds sale tokens (must approve this contract)
address public treasury; // receives ETH & USDT
// Presale parameters
uint256 public tokensForSale; // hard cap (smallest units)
uint256 public tokensSold; // accounting
// Prices (tokens received per 1 unit)
uint256 public priceETH; // tokens per 1 ETH
uint256 public priceUSDT; // tokens per 1 USDT
// Optional time window (0 disables)
uint256 public startTime; // unix seconds
uint256 public endTime; // unix seconds
// Per-wallet limits (in payment units)
uint256 public minETH; // in wei; 0 = no min
uint256 public maxETH; // in wei; 0 = no max
uint256 public minUSDT; // in USDT smallest units; 0 = no min
uint256 public maxUSDT; // in USDT smallest units; 0 = no max
// Contribution tracking
mapping(address => uint256) public contributedETH; // total wei contributed
mapping(address => uint256) public contributedUSDT; // total USDT smallest units
// Track total raised
uint256 public totalRaisedETH;
uint256 public totalRaisedUSDT;
// Whitelist
bool public whitelistEnabled;
mapping(address => bool) public whitelist;
// Events
event BoughtWithETH(address indexed buyer, uint256 weiSpent, uint256 tokensSent);
event BoughtWithUSDT(address indexed buyer, uint256 usdtSpent, uint256 tokensSent);
event TreasuryUpdated(address indexed oldTreasury, address indexed newTreasury);
event StorageWalletUpdated(address indexed oldStorage, address indexed newStorage);
event USDTUpdated(address indexed oldUSDT, address indexed newUSDT, uint8 newDecimals);
event PriceETHUpdated(uint256 oldPrice, uint256 newPrice);
event PriceUSDTUpdated(uint256 oldPrice, uint256 newPrice);
event TimesUpdated(uint256 start, uint256 end);
event LimitsETHUpdated(uint256 minWei, uint256 maxWei);
event LimitsUSDTUpdated(uint256 minUSDT, uint256 maxUSDT);
constructor(
address _token, // your token: 0xa694541ea15d6e94A9D2089dc82253b3cd6a1507
address _storageWallet, // wallet holding presale tokens
address _treasury, // ETH/USDT receiver: 0x6d8B8eB25E79dd4Aa82deB6c279A450B876345Fb
address _usdt, // USDT token address (Ethereum mainnet: 0xdAC17F958D2ee523a2206206994597C13D831ec7)
uint256 _tokensForSale, // e.g., 100_000_000 * 10^tokenDecimals
uint256 _priceETH, // tokens per 1 ETH (e.g., 250_000)
uint256 _priceUSDT, // tokens per 1 USDT (e.g., 100)
uint256 _startTime, // 0 to disable
uint256 _endTime // 0 to disable
)
Ownable(msg.sender) // OpenZeppelin v5 style
{
require(_token != address(0) && _storageWallet != address(0) && _treasury != address(0), "zero addr");
require(_tokensForSale > 0, "tokensForSale=0");
require(_priceETH > 0 && _priceUSDT > 0, "price=0");
token = IERC20(_token);
tokenDecimals = IERC20Metadata(_token).decimals();
storageWallet = _storageWallet;
treasury = _treasury;
tokensForSale = _tokensForSale;
priceETH = _priceETH;
priceUSDT = _priceUSDT;
startTime = _startTime;
endTime = _endTime;
require(_endTime == 0 || _endTime > _startTime, "bad time");
require(_usdt != address(0), "usdt=0");
usdt = IERC20(_usdt);
usdtDecimals = IERC20Metadata(_usdt).decimals();
}
// ---------------------- Internal math ----------------------
modifier onlyWhileOpen() {
if (startTime > 0) require(block.timestamp >= startTime, "not started");
if (endTime > 0) require(block.timestamp <= endTime, "ended");
_;
}
function _ethToTokens(uint256 weiAmount) internal view returns (uint256) {
// tokens = weiAmount * priceETH * 10^tokenDecimals / 1e18
return (weiAmount * priceETH * (10 ** tokenDecimals)) / 1e18;
}
function _usdtToTokens(uint256 usdtAmount) internal view returns (uint256) {
// tokens = usdtAmount * priceUSDT * 10^tokenDecimals / 10^usdtDecimals
return (usdtAmount * priceUSDT * (10 ** tokenDecimals)) / (10 ** usdtDecimals);
}
function _tokensToWeiForETH(uint256 tokenAmount) internal view returns (uint256) {
// wei = tokenAmount * 1e18 / (priceETH * 10^tokenDecimals)
return (tokenAmount * 1e18) / (priceETH * (10 ** tokenDecimals));
}
function _tokensToUSDT(uint256 tokenAmount) internal view returns (uint256) {
// usdt = tokenAmount * 10^usdtDecimals / (priceUSDT * 10^tokenDecimals)
return (tokenAmount * (10 ** usdtDecimals)) / (priceUSDT * (10 ** tokenDecimals));
}
// ---------------------- Buy functions ----------------------
function buyWithETH() external payable nonReentrant onlyWhileOpen {
require(msg.value > 0, "no eth");
if (whitelistEnabled) require(whitelist[msg.sender], "not whitelisted");
uint256 newETH = contributedETH[msg.sender] + msg.value;
if (minETH > 0) require(newETH >= minETH, "below min");
if (maxETH > 0) require(newETH <= maxETH, "above max");
uint256 tokensWanted = _ethToTokens(msg.value);
uint256 remaining = tokensForSale - tokensSold;
require(remaining > 0, "sold out");
uint256 weiToAccept = msg.value;
uint256 tokensToSend = tokensWanted;
if (tokensWanted > remaining) {
tokensToSend = remaining;
uint256 neededWei = _tokensToWeiForETH(tokensToSend);
uint256 refund = msg.value - neededWei;
if (refund > 0) {
(bool rs, ) = msg.sender.call{value: refund}("");
require(rs, "refund failed");
}
weiToAccept = neededWei;
}
contributedETH[msg.sender] += weiToAccept;
tokensSold += tokensToSend;
totalRaisedETH += weiToAccept;
token.safeTransferFrom(storageWallet, msg.sender, tokensToSend);
(bool ok, ) = payable(treasury).call{value: weiToAccept}("");
require(ok, "ETH forward failed");
emit BoughtWithETH(msg.sender, weiToAccept, tokensToSend);
}
function buyWithUSDT(uint256 usdtAmount) external nonReentrant onlyWhileOpen {
require(address(usdt) != address(0), "USDT not set");
require(usdtAmount > 0, "no usdt");
if (whitelistEnabled) require(whitelist[msg.sender], "not whitelisted");
uint256 newUSDT = contributedUSDT[msg.sender] + usdtAmount;
if (minUSDT > 0) require(newUSDT >= minUSDT, "below min");
if (maxUSDT > 0) require(newUSDT <= maxUSDT, "above max");
uint256 tokensWanted = _usdtToTokens(usdtAmount);
uint256 remaining = tokensForSale - tokensSold;
require(remaining > 0, "sold out");
uint256 tokensToSend = tokensWanted;
uint256 usdtToTake = usdtAmount;
if (tokensWanted > remaining) {
tokensToSend = remaining;
usdtToTake = _tokensToUSDT(tokensToSend);
}
contributedUSDT[msg.sender] += usdtToTake;
tokensSold += tokensToSend;
totalRaisedUSDT += usdtToTake;
token.safeTransferFrom(storageWallet, msg.sender, tokensToSend);
usdt.safeTransferFrom(msg.sender, treasury, usdtToTake);
emit BoughtWithUSDT(msg.sender, usdtToTake, tokensToSend);
}
// ---------------------- Admin: updates ----------------------
function setTreasury(address _t) external onlyOwner {
require(_t != address(0), "zero");
emit TreasuryUpdated(treasury, _t);
treasury = _t;
}
function setStorageWallet(address _s) external onlyOwner {
require(_s != address(0), "zero");
emit StorageWalletUpdated(storageWallet, _s);
storageWallet = _s;
}
function setUSDT(address _usdt) external onlyOwner {
require(_usdt != address(0), "zero");
emit USDTUpdated(address(usdt), _usdt, IERC20Metadata(_usdt).decimals());
usdt = IERC20(_usdt);
usdtDecimals = IERC20Metadata(_usdt).decimals();
}
function setPriceETH(uint256 _p) external onlyOwner {
require(_p > 0, "price=0");
emit PriceETHUpdated(priceETH, _p);
priceETH = _p;
}
function setPriceUSDT(uint256 _p) external onlyOwner {
require(_p > 0, "price=0");
emit PriceUSDTUpdated(priceUSDT, _p);
priceUSDT = _p;
}
function setTimes(uint256 _start, uint256 _end) external onlyOwner {
require(_end == 0 || _end > _start, "bad time");
startTime = _start;
endTime = _end;
emit TimesUpdated(_start, _end);
}
function setLimitsETH(uint256 _minWei, uint256 _maxWei) external onlyOwner {
require(_maxWei == 0 || _maxWei >= _minWei, "bad limits");
minETH = _minWei;
maxETH = _maxWei;
emit LimitsETHUpdated(_minWei, _maxWei);
}
function setLimitsUSDT(uint256 _min, uint256 _max) external onlyOwner {
require(_max == 0 || _max >= _min, "bad limits");
minUSDT = _min;
maxUSDT = _max;
emit LimitsUSDTUpdated(_min, _max);
}
function toggleWhitelist(bool en) external onlyOwner { whitelistEnabled = en; }
function setWhitelist(address user, bool allowed) external onlyOwner { whitelist[user] = allowed; }
function batchWhitelist(address[] calldata users, bool allowed) external onlyOwner {
for (uint256 i = 0; i < users.length; i++) {
whitelist[users[i]] = allowed;
}
}
// ---------------------- Views ----------------------
function remainingTokens() external view returns (uint256) {
return tokensForSale - tokensSold;
}
function previewTokensForETH(uint256 weiAmount) external view returns (uint256) {
return _ethToTokens(weiAmount);
}
function previewTokensForUSDT(uint256 usdtAmount) external view returns (uint256) {
return _usdtToTokens(usdtAmount);
}
function totalRaisedInETH() external view returns (uint256) {
return totalRaisedETH;
}
function totalRaisedInUSDT() external view returns (uint256) {
return totalRaisedUSDT;
}
receive() external payable { revert("Use buyWithETH()"); }
fallback() external payable { revert("Invalid"); }
}Submitted on: 2025-10-31 15:21:23
Comments
Log in to comment.
No comments yet.