ICO

{{
  "language": "Solidity",
  "sources": {
    "@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 v5.1.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.20;

/**
 * @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;
    }
}
"
    },
    "@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;
    }
}
"
    },
    "contracts/ICO.sol": {
      "content": "// SPDX-License-Identifier: MIT\r
pragma solidity 0.8.28;\r
\r
import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";\r
import { Ownable } from "@openzeppelin/contracts/access/Ownable.sol";\r
import { ReentrancyGuard } from "@openzeppelin/contracts/utils/ReentrancyGuard.sol";\r
\r
interface IPriceFeed {\r
    function latestAnswer() external view returns (int256);\r
}\r
\r
/**\r
 * @title Coatl ICO Contract\r
 * @notice Handles the initial coin offering (ICO) for the Coatl token with softcap, hardcap, dynamic ETH/USD pricing, and refund logic.\r
 * @dev\r
 * - Accepts ETH contributions in exchange for tokens at a USD-pegged price (10 cents per token, using Chainlink ETH/USD).\r
 * - ICO runs between a start and end timestamp.\r
 * - If softcap is reached, funds can be released to the project before the end date, but ICO continues until hardcap or end.\r
 * - If softcap is not reached by the end, contributors can claim refunds.\r
 * - Tokens are transferred immediately upon purchase.\r
 * - Owner can recover unsold tokens after ICO ends.\r
 * @custom:security-contact security@coatl.one\r
 */\r
contract ICO is Ownable, ReentrancyGuard {\r
    // --- State Variables ---\r
    IERC20 public immutable token;\r
    IPriceFeed public immutable priceFeed; // Chainlink ETH/USD price feed\r
\r
    uint256 public immutable softCap; // in tokens (18 decimals)\r
    uint256 public immutable hardCap; // in tokens (18 decimals)\r
    uint256 public immutable start;\r
    uint256 public immutable end;\r
    uint256 public constant TOKEN_USD_PRICE = 10; // 10 cents\r
    uint256 public constant MIN_CONTRIBUTION_USD = 500; // $5.00 in cents\r
    uint256 public constant MAX_CONTRIBUTION_USD = 100000000; // $1,000,000.00 in cents\r
\r
    uint256 public totalRaised;\r
    uint256 public totalTokensSold;\r
    bool public softCapReached;\r
    bool public finalized;\r
    bool public started;\r
\r
    bool public icoEndedEventEmitted;\r
\r
    mapping(address => uint256) public contributions;\r
    mapping(address => uint256) public tokensPurchased;\r
\r
    address public immutable projectWallet;\r
\r
    // --- Events ---\r
    event TokensPurchased(address indexed buyer, uint256 ethAmount, uint256 tokenAmount);\r
    event FundsReleased(address indexed to, uint256 amount);\r
    event RefundClaimed(address indexed buyer, uint256 amount);\r
    event ICOStarted(uint256 start, uint256 end, uint256 softCap, uint256 hardCap);\r
    event ICOEnded(bool successful, uint256 totalRaised);\r
    event UnsoldTokensRecovered(address indexed to, uint256 amount);\r
    event Finalized();\r
    event EmergencyWithdraw(address indexed to, uint256 amount);\r
    event ICOCreated(uint256 start, uint256 end, uint256 softCap, uint256 hardCap);\r
\r
    // --- Custom Errors ---\r
    error ZeroAddressNotAllowed();\r
    error InvalidCaps();\r
    error InvalidTimeWindow();\r
    error HardcapReached();\r
    error NoEthSent();\r
    error ZeroTokens();\r
    error TokenTransferFailed();\r
    error EthTransferFailed();\r
    error SoftcapNotReached();\r
    error ICOnotEnded();\r
    error SoftcapReachedAlready();\r
    error NoContribution();\r
    error RefundFailed();\r
    error InvalidPrice();\r
    error ContributionTooLow();\r
    error ContributionTooHigh();\r
    error NotEnoughTokens();\r
    error DirectEthNotAllowed();\r
    error ICONotActive();\r
    error NoEthToRelease();\r
    error NoUnsoldTokens();\r
    error AlreadyFinalized();\r
    error NotFinalized();\r
    error NoEthToWithdraw();\r
    error UnsoldTokensNotRecovered();\r
\r
    // --- Constructor ---\r
    /**\r
     * @notice Deploys the ICO contract for a specific token and price feed.\r
     * @param _token The address of the Coatl token contract.\r
     * @param _priceFeed The address of the Chainlink ETH/USD price feed.\r
     * @param _softCap The minimum amount of CTL to consider the ICO successful.\r
     * @param _hardCap The maximum amount of CTL to consider the ICO successful.\r
     * @param _start The ICO start timestamp.\r
     * @param _end The ICO end timestamp.\r
     * @param _projectWallet The immutable project/multisig wallet to receive funds.\r
     */\r
    constructor(\r
        address _token,\r
        address _priceFeed,\r
        uint256 _softCap,\r
        uint256 _hardCap,\r
        uint256 _start,\r
        uint256 _end,\r
        address _projectWallet\r
    ) Ownable(msg.sender) {\r
        if (_token == address(0) || _priceFeed == address(0) || _projectWallet == address(0)) revert ZeroAddressNotAllowed();\r
        if (_softCap == 0 || _hardCap <= _softCap) revert InvalidCaps();\r
        if (_start >= _end || _end <= block.timestamp) revert InvalidTimeWindow();\r
\r
        token = IERC20(_token);\r
        priceFeed = IPriceFeed(_priceFeed);\r
        softCap = _softCap;\r
        hardCap = _hardCap;\r
        start = _start;\r
        end = _end;\r
        projectWallet = _projectWallet;\r
\r
        emit ICOCreated(_start, _end, _softCap, _hardCap);\r
    }\r
\r
    // --- Modifiers ---\r
    modifier onlyWhileOpen() {\r
        if (block.timestamp < start || block.timestamp > end) {\r
            if (!icoEndedEventEmitted) {\r
                icoEndedEventEmitted = true;\r
                emit ICOEnded(softCapReached, totalRaised);\r
            }\r
            revert ICONotActive();\r
        }\r
        _;\r
    }\r
\r
    // --- Fallbacks ---\r
    receive() external payable {\r
        revert DirectEthNotAllowed();\r
    }\r
\r
    fallback() external payable {\r
        revert DirectEthNotAllowed();\r
    }\r
\r
    // --- Functions ---\r
\r
    /**\r
     * @notice Buy tokens with ETH at the current USD price.\r
     * @dev Calculates token amount based on Chainlink ETH/USD price and 10 cent USD price per token.\r
     */\r
    function buyTokens() external payable nonReentrant onlyWhileOpen {\r
        if (!started) {\r
            started = true;\r
            emit ICOStarted(start, end, softCap, hardCap);\r
        }\r
\r
        if (totalTokensSold >= hardCap) revert HardcapReached();\r
        if (msg.value == 0) revert NoEthSent();\r
\r
        uint256 ethUsd = getEthUsdPrice();\r
\r
        uint256 minWei = (MIN_CONTRIBUTION_USD * 1e18) / (ethUsd / 1e16);\r
        uint256 maxWei = (MAX_CONTRIBUTION_USD * 1e18) / (ethUsd / 1e16);\r
\r
        if (msg.value < minWei) revert ContributionTooLow();\r
        if (contributions[msg.sender] + msg.value > maxWei) revert ContributionTooHigh();\r
\r
        uint256 usdValue = (msg.value * ethUsd) / 1e18;\r
        uint256 tokens = (usdValue * 100) / TOKEN_USD_PRICE;\r
        if (tokens == 0) revert ZeroTokens();\r
        if (token.balanceOf(address(this)) < tokens) revert NotEnoughTokens();\r
\r
        if (totalTokensSold + tokens > hardCap) revert HardcapReached();\r
\r
        if (!token.transfer(msg.sender, tokens)) revert TokenTransferFailed();\r
\r
        contributions[msg.sender] += msg.value;\r
        tokensPurchased[msg.sender] += tokens;\r
        totalRaised += msg.value;\r
        totalTokensSold += tokens;\r
\r
        emit TokensPurchased(msg.sender, msg.value, tokens);\r
\r
        if (!softCapReached && totalTokensSold >= softCap) {\r
            softCapReached = true;\r
        }\r
    }\r
\r
    /**\r
     * @notice Returns the latest ETH/USD price from Chainlink.\r
     * @dev Scales the price to 18 decimals.\r
     */\r
    function getEthUsdPrice() public view returns (uint256) {\r
        int256 price = priceFeed.latestAnswer(); // 8 decimals\r
        if (price <= 0) revert InvalidPrice();\r
        return uint256(price) * 1e10; // scale to 18 decimals\r
    }\r
\r
    /**\r
     * @notice Returns the minimum amount of wei allowed for a token purchase at the current ETH/USD price.\r
     */\r
    function getMinWeiAllowed() external view returns (uint256) {\r
        uint256 ethUsd = getEthUsdPrice();\r
        return (MIN_CONTRIBUTION_USD * 1e18) / (ethUsd / 1e16);\r
    }\r
\r
    /**\r
     * @notice Returns the maximum amount of wei allowed for a token purchase at the current ETH/USD price.\r
     */\r
    function getMaxWeiAllowed() external view returns (uint256) {\r
        uint256 ethUsd = getEthUsdPrice();\r
        return (MAX_CONTRIBUTION_USD * 1e18) / (ethUsd / 1e16);\r
    }\r
\r
    /**\r
     * @notice Releases all raised ETH to the project wallet if softcap is reached.\r
     */\r
    function releaseFunds() external onlyOwner nonReentrant {\r
        if (!softCapReached) revert SoftcapNotReached();\r
        uint256 amount = address(this).balance;\r
        if (amount == 0) revert NoEthToRelease();\r
        (bool sent, ) = projectWallet.call{value: amount}("");\r
        if (!sent) revert TokenTransferFailed();\r
        emit FundsReleased(projectWallet, amount);\r
    }\r
\r
    /**\r
     * @notice Allows contributors to claim a refund if the ICO was unsuccessful.\r
     */\r
    function claimRefund() external nonReentrant {\r
        if (block.timestamp <= end) revert ICOnotEnded();\r
        if (softCapReached) revert SoftcapReachedAlready();\r
        uint256 contributed = contributions[msg.sender];\r
        if (contributed == 0) revert NoContribution();\r
        (bool sent, ) = msg.sender.call{value: contributed}("");\r
        if (!sent) revert RefundFailed();\r
        contributions[msg.sender] = 0;\r
        emit RefundClaimed(msg.sender, contributed);\r
    }\r
\r
    /**\r
     * @notice Returns true if the ICO softcap has been reached.\r
     */\r
    function icoSuccessful() public view returns (bool) {\r
        return softCapReached;\r
    }\r
\r
    /**\r
     * @notice Returns true if the ICO has ended (by time or hardcap).\r
     */\r
    function icoEnded() public view returns (bool) {\r
        return block.timestamp > end || totalTokensSold >= hardCap;\r
    }\r
\r
    /**\r
     * @notice Owner can recover unsold tokens after ICO ends.\r
     * @param to The address to receive the unsold tokens.\r
     */\r
    function recoverUnsoldTokens(address to) external onlyOwner {\r
        uint256 unsold = token.balanceOf(address(this));\r
        if (!icoEnded()) revert ICOnotEnded();\r
        if (finalized) revert AlreadyFinalized();\r
        if (unsold == 0) revert NoUnsoldTokens();\r
        if (!token.transfer(to, unsold)) revert TokenTransferFailed();\r
        emit UnsoldTokensRecovered(to, unsold);\r
    }\r
\r
    /**\r
     * @notice Finalizes the ICO, preventing further state changes.\r
     * Can only be called after the ICO has ended and all unsold tokens are recovered.\r
     */\r
    function finalize() external onlyOwner {\r
        if (!icoEnded()) revert ICOnotEnded();\r
        if (finalized) revert AlreadyFinalized();\r
        if (token.balanceOf(address(this)) > 0) revert UnsoldTokensNotRecovered();\r
        finalized = true;\r
        emit Finalized();\r
    }\r
\r
    /**\r
     * @notice Emergency function to withdraw stuck ETH after ICO is finalized.\r
     * Only callable by the owner and only after finalization.\r
     * @param to The address to receive the ETH.\r
     */\r
    function emergencyWithdraw(address to) external onlyOwner {\r
        if (!finalized) revert NotFinalized();\r
        uint256 amount = address(this).balance;\r
        if (amount == 0) revert NoEthToWithdraw();\r
        (bool sent, ) = to.call{value: amount}("");\r
        if (!sent) revert EthTransferFailed();\r
        emit EmergencyWithdraw(to, amount);\r
    }\r
}"
    }
  },
  "settings": {
    "evmVersion": "paris",
    "optimizer": {
      "enabled": false,
      "runs": 200
    },
    "outputSelection": {
      "*": {
        "*": [
          "evm.bytecode",
          "evm.deployedBytecode",
          "devdoc",
          "userdoc",
          "metadata",
          "abi"
        ]
      }
    },
    "libraries": {}
  }
}}