ZynoICO

{{
  "language": "Solidity",
  "sources": {
    "contracts/ZynoICO.sol": {
      "content": "// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";

/**
 * @title ZynoICO
 * @dev ICO contract for ZYNO token sales
 * - Price: $0.02 per ZYNO token
 * - Payment: ETH only
 * - Uses Chainlink price oracle for ETH/USD conversion
 * - No time limits or purchase restrictions
 */
contract ZynoICO is Ownable, ReentrancyGuard {
    IERC20 public zynoToken;
    
    // Chainlink ETH/USD Price Feed (Mainnet)
    // Address: 0x5f4eC3Df9cbd43714FE2740f5E3616155c5b8419
    AggregatorV3Interface public priceFeed;
    
    uint256 public constant TOKEN_PRICE_USD = 2; // $0.02 in cents (2 cents)
    uint256 public constant PRICE_DECIMALS = 2; // For cent conversion
    
    uint256 public totalTokensSold;
    uint256 public totalETHRaised;
    bool public icoPaused;
    
    event TokensPurchased(
        address indexed buyer,
        uint256 ethAmount,
        uint256 tokenAmount,
        uint256 ethUsdPrice
    );
    event ICOPaused(bool paused);
    event ETHWithdrawn(address indexed owner, uint256 amount);
    event TokensWithdrawn(address indexed owner, uint256 amount);
    
    constructor(
        address _zynoTokenAddress,
        address _priceFeedAddress
    ) Ownable(msg.sender) {
        require(_zynoTokenAddress != address(0), "Invalid token address");
        require(_priceFeedAddress != address(0), "Invalid price feed address");
        
        zynoToken = IERC20(_zynoTokenAddress);
        priceFeed = AggregatorV3Interface(_priceFeedAddress);
        icoPaused = false;
    }
    
    /**
     * @dev Purchase ZYNO tokens with ETH
     * Calculates token amount based on current ETH/USD price
     */
    function buyTokens() external payable nonReentrant {
        require(!icoPaused, "ICO is paused");
        require(msg.value > 0, "Must send ETH to buy tokens");
        
        // Get current ETH/USD price from Chainlink
        uint256 ethUsdPrice = getLatestETHPrice();
        
        // Calculate USD value of sent ETH
        // ethUsdPrice has 8 decimals, msg.value has 18 decimals
        uint256 usdValue = (msg.value * ethUsdPrice) / 1e8;
        
        // Calculate token amount
        // usdValue is in wei (18 decimals), TOKEN_PRICE_USD is in cents
        // Convert to token amount with 18 decimals
        uint256 tokenAmount = (usdValue * 100) / TOKEN_PRICE_USD;
        
        require(tokenAmount > 0, "Token amount too small");
        
        // Check if contract has enough tokens
        uint256 contractBalance = zynoToken.balanceOf(address(this));
        require(contractBalance >= tokenAmount, "Insufficient tokens in ICO contract");
        
        // Transfer tokens to buyer
        require(zynoToken.transfer(msg.sender, tokenAmount), "Token transfer failed");
        
        // Update stats
        totalTokensSold += tokenAmount;
        totalETHRaised += msg.value;
        
        emit TokensPurchased(msg.sender, msg.value, tokenAmount, ethUsdPrice);
    }
    
    /**
     * @dev Get latest ETH/USD price from Chainlink
     * @return price with 8 decimals
     */
    function getLatestETHPrice() public view returns (uint256) {
        (
            /* uint80 roundID */,
            int256 price,
            /* uint256 startedAt */,
            /* uint256 timeStamp */,
            /* uint80 answeredInRound */
        ) = priceFeed.latestRoundData();
        
        require(price > 0, "Invalid price from oracle");
        return uint256(price);
    }
    
    /**
     * @dev Calculate how many tokens buyer will receive for given ETH amount
     * @param ethAmount Amount of ETH (in wei)
     * @return Token amount with 18 decimals
     */
    function calculateTokenAmount(uint256 ethAmount) external view returns (uint256) {
        if (ethAmount == 0) return 0;
        
        uint256 ethUsdPrice = getLatestETHPrice();
        uint256 usdValue = (ethAmount * ethUsdPrice) / 1e8;
        uint256 tokenAmount = (usdValue * 100) / TOKEN_PRICE_USD;
        
        return tokenAmount;
    }
    
    /**
     * @dev Get available tokens in ICO contract
     */
    function getAvailableTokens() external view returns (uint256) {
        return zynoToken.balanceOf(address(this));
    }
    
    /**
     * @dev Pause or resume ICO (owner only)
     */
    function pauseICO(bool _pause) external onlyOwner {
        icoPaused = _pause;
        emit ICOPaused(_pause);
    }
    
    /**
     * @dev Withdraw ETH collected from sales (owner only)
     */
    function withdrawETH() external onlyOwner nonReentrant {
        uint256 balance = address(this).balance;
        require(balance > 0, "No ETH to withdraw");
        
        (bool success, ) = payable(owner()).call{value: balance}("");
        require(success, "ETH withdrawal failed");
        
        emit ETHWithdrawn(owner(), balance);
    }
    
    /**
     * @dev Withdraw remaining tokens from ICO contract (owner only)
     * Useful for ending ICO or recovering unsold tokens
     */
    function withdrawTokens(uint256 amount) external onlyOwner nonReentrant {
        uint256 balance = zynoToken.balanceOf(address(this));
        require(balance >= amount, "Insufficient token balance");
        
        require(zynoToken.transfer(owner(), amount), "Token withdrawal failed");
        
        emit TokensWithdrawn(owner(), amount);
    }
    
    /**
     * @dev Emergency function to withdraw all remaining tokens
     */
    function withdrawAllTokens() external onlyOwner nonReentrant {
        uint256 balance = zynoToken.balanceOf(address(this));
        require(balance > 0, "No tokens to withdraw");
        
        require(zynoToken.transfer(owner(), balance), "Token withdrawal failed");
        
        emit TokensWithdrawn(owner(), balance);
    }
    
    // Allow contract to receive ETH
    receive() external payable {
        revert("Use buyTokens() function to purchase tokens");
    }
}

/**
 * @dev Interface for Chainlink Price Feed
 */
interface AggregatorV3Interface {
    function latestRoundData()
        external
        view
        returns (
            uint80 roundId,
            int256 answer,
            uint256 startedAt,
            uint256 updatedAt,
            uint80 answeredInRound
        );
}
"
    },
    "@openzeppelin/contracts/utils/ReentrancyGuard.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (utils/ReentrancyGuard.sol)

pragma solidity ^0.8.20;

/**
 * @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 EIP-1153 (transient storage) is available on the chain you're deploying at,
 * consider using {ReentrancyGuardTransient} instead.
 *
 * 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;

    /**
     * @dev Unauthorized reentrant call.
     */
    error ReentrancyGuardReentrantCall();

    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
        if (_status == ENTERED) {
            revert ReentrancyGuardReentrantCall();
        }

        // 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;
    }
}
"
    },
    "@openzeppelin/contracts/access/Ownable.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable.sol)

pragma solidity ^0.8.20;

import {Context} from "../utils/Context.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.
 *
 * 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);
    }
}
"
    },
    "@openzeppelin/contracts/token/ERC20/IERC20.sol": {
      "content": "// SPDX-License-Identifier: MIT
// 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);
}
"
    },
    "@openzeppelin/contracts/utils/Context.sol": {
      "content": "// SPDX-License-Identifier: MIT
// 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;
    }
}
"
    }
  },
  "settings": {
    "optimizer": {
      "enabled": false,
      "runs": 200
    },
    "outputSelection": {
      "*": {
        "*": [
          "evm.bytecode",
          "evm.deployedBytecode",
          "devdoc",
          "userdoc",
          "metadata",
          "abi"
        ]
      }
    },
    "remappings": []
  }
}}