Address io1rzj5njgnzqpyftwdueulyx26kkjupvptqz0nzy

Contract Overview

Balance:
0 IOTX

IOTX Value:
$ 0

Token:
Txn Hash
Block
From
To
Value [Txn Fee]
e19ac66de51228d880702ef80eec8248bc5f2a0ad8394a7c9188f531df9ca12e 29566339 2024-04-19 21:29:15 +0000 UTC 15 hours ago io1jg6djkq3k3s4gx0fl5c24mfmtqgljw50kxev3h  IN    Contract: Staking 0 IOTX 0.061306
1c90e352fbe36baf22d00d6140e734929579d77cc1f118c6f6df66d7de48b987 29266831 2024-04-02 13:05:45 +0000 UTC 18 days ago io1gulyd549nvnrv7rz2gu4vmz3l96hdsaffw8cpm  IN    Contract: Staking 0 IOTX 0.122612
563fbd684cbe17b82d4200b65e3e988b459749e73eddacc9bf76b57bc8a254fc 29266810 2024-04-02 13:04:00 +0000 UTC 18 days ago io196l6ngncejs0qvckx9rsx5ezk2e8aueeke224j  IN    Contract: Staking 0 IOTX 0.156812
c0393ab1bd18530006e6b3500570d19ffa4bd5c0ba94c21156d074e5828ddf2b 29206384 2024-03-30 01:07:55 +0000 UTC 21 days ago io1zx82k9qdjryfzwe334mxsw8td9keg0zed6dxzt  IN    Contract: Staking 0 IOTX 0.122612
775410717caa701528405a8eeb95fae860892728daef3064c9cdcef565084317 28938539 2024-03-14 12:44:05 +0000 UTC one month ago io1je4v33chzhs58smkv95u0r7s0c0clswdcx06p6  IN    Contract: Staking 0 IOTX 0.10403
dca6c595351787cf4c8b9d16bc1a1fa5cc9f0d340a7fb451463f5ac69217b463 28935994 2024-03-14 09:12:00 +0000 UTC one month ago io14z95tf9c6qjqg2s2fkk6uhhkjnxg98ffzqnwyw  IN    Contract: Staking 0 IOTX 0.352827
0086156b1408b8394b5a005f96dd2a5c9e16d16e1f795095c6394582f16cd0a4 28881332 2024-03-11 05:16:45 +0000 UTC one month ago io196l6ngncejs0qvckx9rsx5ezk2e8aueeke224j  IN    Contract: Staking 0 IOTX 0.722376
a92677a3475f6d7d800f875a12376e0e256ac533c7244360a7c73d8facbb7c57 28881230 2024-03-11 05:08:15 +0000 UTC one month ago io1gulyd549nvnrv7rz2gu4vmz3l96hdsaffw8cpm  IN    Contract: Staking 0 IOTX 0.743976
b679cd5c287337d6dd6e2b167a420a0194f9f7a167abfd04602ce7b4ecf33458 28870509 2024-03-10 14:14:50 +0000 UTC one month ago io1jg6djkq3k3s4gx0fl5c24mfmtqgljw50kxev3h  IN    Contract: Staking 0 IOTX 0.160528
636ae9bdd5e09692e81cd213a657f622c65f3c6909d31c0977178ece9278e11e 28858603 2024-03-09 21:40:10 +0000 UTC one month ago io1zx82k9qdjryfzwe334mxsw8td9keg0zed6dxzt  IN    Contract: Staking 0 IOTX 0.689018
2c45ffa343cec6e437cf6606917aa8f6a9a44fae726e8c094362e8ba530eebca 28693567 2024-02-29 08:14:00 +0000 UTC 2 months ago io14z95tf9c6qjqg2s2fkk6uhhkjnxg98ffzqnwyw  IN    Contract: Staking 0 IOTX 0.80264
06004f1c405b53e69203b6380f53b7b25ef61bc09133536ab776cce56af5725c 28546283 2024-02-20 19:35:05 +0000 UTC 2 months ago io1dmkkzdlmf32qzwukc22kk08zmn6c97nyvs6aeg  IN    Contract: Staking 0 IOTX 0.48464
856ef1aff93d37ec81a321792c440aaa5eb01427afceed462fb121b58cc567d8 28528519 2024-02-19 18:47:15 +0000 UTC 2 months ago io1dmkkzdlmf32qzwukc22kk08zmn6c97nyvs6aeg  IN    Contract: Staking 0 IOTX 0.39203
45f301dfe7c8e11bc1b8386279f1b284fa7eabf1fe8da2ad9091a9b42f160d18 27915841 2024-01-15 06:01:00 +0000 UTC 3 months ago io1hnh72r93lv5vxl8hfzqk6jnp3samj26k3ahnf7  IN    Contract: Staking 0 IOTX 0.30653
42e104bf72616f4231736b5912677d572907e21b0a01dd2a6d025b88ba9d881e 27561073 2023-12-25 16:00:40 +0000 UTC 4 months ago io1hnh72r93lv5vxl8hfzqk6jnp3samj26k3ahnf7  IN    Contract: Staking 0 IOTX 0.85064
7abb89c596062660b499e7d2b22960310ec1025cc4bbaf14965bc90bab905024 27558388 2023-12-25 12:16:40 +0000 UTC 4 months ago io1dmkkzdlmf32qzwukc22kk08zmn6c97nyvs6aeg  IN    Contract: Staking 0 IOTX 0.80264
1cee4ab2b6623628248fdf6b157ef3b3783febff8e4336baa77a202eff76298d 27549462 2023-12-24 23:52:05 +0000 UTC 4 months ago io1h0p79nvp6c5w5r9hrffdgpjuakszkp6ph2d3rf  IN    Contract: Staking 0 IOTX 0.39203
ee8432b57f5a42ddc991a8022e2a75986050d84081b03a8c1d3daafc9a9e33cf 26147635 2023-10-04 18:06:05 +0000 UTC 7 months ago io1dzydxuxcp8qfden96zrflm2ys8ty3x0x0kauk4  IN    Contract: Staking 0 IOTX 0.078406
8088dd6080e86b508deeb2eb5260c3f0a453e939430e35ba99c787a044776f27 25763438 2023-09-12 12:24:25 +0000 UTC 7 months ago io1dzydxuxcp8qfden96zrflm2ys8ty3x0x0kauk4  IN    Contract: Staking 0 IOTX 0.165328
200e0327fe1a5ae295efb01040872c6d15d44e47b6cdc36650b858d3cb5c0755 23435198 2023-04-30 17:51:55 +0000 UTC one year ago io1ls0ksng5jayh84cy5aqg7ux864myqgpe6xxshy  IN    Contract: Staking 0 IOTX 0.078406
7c2619201e3af54563bbb8c3e7629710cd4f8e5644e31330018b52a7fc4fc917 23151513 2023-04-14 07:16:10 +0000 UTC one year ago io1m05n7psllwwuy77d25ckjj02myv2w5valq3q0q  IN    Contract: Staking 0 IOTX 0.061306
1e2fdfaa560e826eeed768fdbe0e8b1b06f2792b6da3c49813f5ac3c394ad76b 22914333 2023-03-31 13:24:45 +0000 UTC one year ago io1ezt2a6ykjnytm7mjcwgz94lhku8sg6pgspfdye  IN    Contract: Staking 0 IOTX 0.078406
2e1de140fe72a75fa7d9862f9c86abff19a61eacd9be625356dad39c42133c24 22909946 2023-03-31 07:19:10 +0000 UTC one year ago io1m05n7psllwwuy77d25ckjj02myv2w5valq3q0q  IN    Contract: Staking 0 IOTX 0.021812
1ae57a32cdc2b0bf8e65ad06db90a1a787e9c045579f556e3c73aa84116e1734 22909946 2023-03-31 07:19:10 +0000 UTC one year ago io1m05n7psllwwuy77d25ckjj02myv2w5valq3q0q  IN    Contract: Staking 0 IOTX 0.021812
a453608a37d6c6ce3c988bb6e1a2f8332577cdf0d0000a2cb92c4ffa50113e76 22909945 2023-03-31 07:19:05 +0000 UTC one year ago io1m05n7psllwwuy77d25ckjj02myv2w5valq3q0q  IN    Contract: Staking 0 IOTX 0.021812
Parent Txn Hash Block From To Value
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Contract Source Code Verified (Exact Match)

Contract Name:
Staking

Compiler Version
v0.8.10+commit.fc410830

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, None license

Contract Source Code (Solidity)

// File @openzeppelin/contracts/token/ERC20/[email protected]

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @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 `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);

    /**
     * @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
    );
}

// File @openzeppelin/contracts/utils/[email protected]

// OpenZeppelin Contracts (last updated v4.5.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @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
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @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"
        );

        (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"
        );
        require(isContract(target), "Address: call to non-contract");

        (bool success, bytes memory returndata) = target.call{value: value}(
            data
        );
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data)
        internal
        view
        returns (bytes memory)
    {
        return
            functionStaticCall(
                target,
                data,
                "Address: low-level static call failed"
            );
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data)
        internal
        returns (bytes memory)
    {
        return
            functionDelegateCall(
                target,
                data,
                "Address: low-level delegate call failed"
            );
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        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

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// File @openzeppelin/contracts/token/ERC20/utils/[email protected]

// OpenZeppelin Contracts v4.4.1 (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 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 {
    using Address for address;

    function safeTransfer(
        IERC20 token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(
            token,
            abi.encodeWithSelector(token.transfer.selector, to, value)
        );
    }

    function safeTransferFrom(
        IERC20 token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(
            token,
            abi.encodeWithSelector(token.transferFrom.selector, from, to, value)
        );
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(
            token,
            abi.encodeWithSelector(token.approve.selector, spender, value)
        );
    }

    function safeIncreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(
            token,
            abi.encodeWithSelector(
                token.approve.selector,
                spender,
                newAllowance
            )
        );
    }

    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(
                oldAllowance >= value,
                "SafeERC20: decreased allowance below zero"
            );
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(
                token,
                abi.encodeWithSelector(
                    token.approve.selector,
                    spender,
                    newAllowance
                )
            );
        }
    }

    /**
     * @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).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(
            data,
            "SafeERC20: low-level call failed"
        );
        if (returndata.length > 0) {
            // Return data is optional
            require(
                abi.decode(returndata, (bool)),
                "SafeERC20: ERC20 operation did not succeed"
            );
        }
    }
}

// File @openzeppelin/contracts/utils/[email protected]

// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @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 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/[email protected]

// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)

pragma solidity ^0.8.0;

/**
 * @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 Returns the address of the current owner.
     */
    function owner() public view virtual 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 {
        _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);
    }
}

// File @openzeppelin/contracts/utils/math/[email protected]

// OpenZeppelin Contracts (last updated v4.5.0) (utils/math/Math.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a >= b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow.
        return (a & b) + (a ^ b) / 2;
    }

    /**
     * @dev Returns the ceiling of the division of two numbers.
     *
     * This differs from standard division with `/` in that it rounds up instead
     * of rounding down.
     */
    function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b - 1) / b can overflow on addition, so we distribute.
        return a / b + (a % b == 0 ? 0 : 1);
    }
}

// File contracts/Staking.sol

pragma solidity 0.8.10;

/**
 *  @dev Structs to store user staking data.
 */
struct Deposit {
    uint256 depositAmount;
    uint256 depositTime;
    uint256 endTime;
    uint32 rate;
    bool paid;
}

/**
 *  @dev Structs to store staking contract basic information
 */
struct StakingContractInfo {
    string name;
    address addr;
    uint32 lockDuration; // in hours
    uint32 rate;
    uint8 withdrawFeePercent;
}

contract Staking is Ownable {
    using SafeERC20 for IERC20;

    error AllowanceTooLow(uint256 current, uint256 required);
    error InsufficientRewardsPleaseAddRewardsOrUseEmergencyExit(
        uint256 available,
        uint256 required
    );
    error MustNotBeZero(string param);
    error NoStakeFoundForUser(address user);
    error NoZeroAddress(string param);
    error MaturityDateExpiredPleaseWithdraw();
    error StakingIsPaused();
    error MustBeLessOrEqual100();

    mapping(address => Deposit) private deposits;
    mapping(address => bool) private hasStaked;

    StakingContractInfo internal contractInfo;
    IERC20 public tokenAddress;
    address public treasury;
    uint256 public stakedBalance;
    uint256 public rewardBalance;
    uint256 public totalParticipants;
    bool public isStopped;
    uint256 public constant INTEREST_RATE_CONVERTER = 100;
    uint256 public constant YEAR_IN_SECONDS = 31536000;

    /**
     *  @notice Emitted when user stakes new value of tokens
     */
    event Staked(
        address indexed token,
        address indexed staker,
        uint256 stakedAmount
    );

    /**
     *  @notice Emitted when user withdraws his deposit
     */
    event PaidOut(
        address indexed token,
        address indexed staker,
        uint256 amount,
        uint256 reward
    );

    /**
     *  @notice Emitted when user withdraws his deposit
     */
    event RateAndLockdurationChanged(
        uint32 newRate,
        uint32 lockDuration,
        uint256 time
    );

    /**
     *  @notice Emitted when new amount of rewards is added to contract
     */
    event RewardsAdded(uint256 amount, uint256 time);

    /**
     *  @notice Emitted when contract is paused/unpaused
     */
    event StakingStatusChanged(bool status, uint256 time);

    /**
     *  @notice Emitted when owner changes withdraw fee
     */
    event WithdrawFeeChanged(uint8 newFee, uint256 time);

    modifier withdrawCheck(address from) {
        if (!hasStaked[from]) revert NoStakeFoundForUser(from);
        _;
    }

    modifier hasAllowance(address allower, uint256 amount) {
        // Make sure the allower has provided the right allowance.
        uint256 ourAllowance = tokenAddress.allowance(allower, address(this));

        if (amount > ourAllowance) revert AllowanceTooLow(ourAllowance, amount);
        _;
    }

    /**
     *   @param name name of the contract
     *   @param tokenAddress_ contract address of the token
     *   @param rate percentage
     *   @param lockDuration duration in hours
     */
    constructor(
        string memory name,
        IERC20 tokenAddress_,
        uint32 rate,
        uint32 lockDuration,
        uint8 withdrawFeePercent,
        address treasury_
    ) {
        if (withdrawFeePercent > 100) revert MustBeLessOrEqual100();
        if (address(tokenAddress_) == address(0)) {
            revert NoZeroAddress("tokenAddress_");
        }
        if (address(treasury_) == address(0)) {
            revert NoZeroAddress("treasury_");
        }

        contractInfo = StakingContractInfo(
            name,
            address(this),
            lockDuration,
            rate,
            withdrawFeePercent
        );

        tokenAddress = tokenAddress_;
        treasury = treasury_;
    }

    /**
     *  @notice owner can change current withdraw fee for stakers
     *  @param percent withdraw fee percentage
     */
    function setWithdrawFee(uint8 percent) external onlyOwner {
        if (percent > 100) revert MustBeLessOrEqual100();

        contractInfo.withdrawFeePercent = percent;

        emit WithdrawFeeChanged(percent, block.timestamp);
    }

    /**
     *  @notice to set new interest rates and lock duration
     *  @param rate New effective interest rate
     *  @param lockDuration Duration of lock for new deposits in hours
     *  @dev lockduration is in hours
     */
    function setRateAndLockduration(uint32 rate, uint32 lockDuration)
        external
        onlyOwner
    {
        contractInfo.rate = rate;
        contractInfo.lockDuration = lockDuration;

        emit RateAndLockdurationChanged(rate, lockDuration, block.timestamp);
    }

    /**
     *  @dev if _status is false contract will be "stopped" and
     *  no new deposits will be allowed
     */
    function changeStakingStatus(bool _status) external onlyOwner {
        isStopped = _status;

        emit StakingStatusChanged(_status, block.timestamp);
    }

    /**
     *  @param amount Amount to be staked
     *  @dev to stake 'amount' value of tokens
     *  once the user has given allowance to the staking contract
     */
    function stake(uint256 amount) external hasAllowance(msg.sender, amount) {
        if (amount == 0) revert MustNotBeZero("amount");
        if (isStopped) revert StakingIsPaused();

        address from = msg.sender;
        if (hasStaked[from] && (block.timestamp >= deposits[from].endTime)) {
            revert MaturityDateExpiredPleaseWithdraw();
        }

        uint256 newAmount;
        if (hasStaked[from]) {
            newAmount =
                amount +
                deposits[from].depositAmount +
                _calculate(from, block.timestamp);
        } else {
            hasStaked[from] = true;

            newAmount = amount;
            totalParticipants += 1;
        }

        deposits[from] = Deposit({
            depositAmount: newAmount,
            depositTime: block.timestamp,
            endTime: block.timestamp +
                uint256(contractInfo.lockDuration) *
                3600,
            rate: contractInfo.rate,
            paid: false
        });

        stakedBalance = stakedBalance + amount;
        tokenAddress.safeTransferFrom(from, address(this), amount);

        emit Staked(address(tokenAddress), from, amount);
    }

    function getUserDeposit(address _userAddress)
        external
        view
        returns (Deposit memory)
    {
        return deposits[_userAddress];
    }

    function getContractInfo()
        public
        view
        returns (StakingContractInfo memory)
    {
        return contractInfo;
    }

    /**
     * @notice Calcule withdraw penalty for user if deposit is withdrawn now
     *
     */
    function calculateWithdrawFee(address user) public view returns (uint256) {
        Deposit storage userDeposit = deposits[user];

        if (block.timestamp > userDeposit.endTime) {
            return 0;
        }

        return
            (userDeposit.depositAmount * contractInfo.withdrawFeePercent) / 100;
    }

    /**
     *  @param rewardAmount rewards to be added to the staking contract
     *  @dev to add rewards to the staking contract
     *  once the allowance is given to this contract for 'rewardAmount' by the user
     */
    function addReward(uint256 rewardAmount)
        external
        hasAllowance(msg.sender, rewardAmount)
    {
        if (rewardAmount == 0) revert MustNotBeZero("rewardAmount");

        rewardBalance = rewardBalance + rewardAmount;

        tokenAddress.safeTransferFrom(msg.sender, address(this), rewardAmount);

        emit RewardsAdded(rewardAmount, block.timestamp);
    }

    function withdraw() external withdrawCheck(msg.sender) {
        address from = msg.sender;
        uint256 endTime = Math.min(block.timestamp, deposits[from].endTime);
        uint256 reward = _calculate(from, endTime);

        if (rewardBalance < reward) {
            revert InsufficientRewardsPleaseAddRewardsOrUseEmergencyExit(
                rewardBalance,
                reward
            );
        }

        _withdraw(from, reward);
    }

    function _withdraw(address from, uint256 reward) private {
        uint256 penalty = calculateWithdrawFee(from);
        uint256 amount = deposits[from].depositAmount;
        uint256 amountAfterPenalty = amount - penalty;

        stakedBalance = stakedBalance - amount;
        rewardBalance = rewardBalance - reward;

        deposits[from].paid = true;
        hasStaked[from] = false;
        totalParticipants -= 1;

        // send user his deposit
        tokenAddress.safeTransfer(from, amountAfterPenalty + reward);
        if (penalty > 0) {
            // send any penalty to treasury wallet
            tokenAddress.safeTransfer(treasury, penalty);
        }

        emit PaidOut(address(tokenAddress), from, amountAfterPenalty, reward);
    }

    /**
     * @notice in case contract runs out of rewards and user is impatient
     */
    function emergencyWithdraw() external withdrawCheck(msg.sender) {
        _withdraw(msg.sender, 0);
    }

    /**
     * @param user User wallet address
     * @return totalRewards Rewards from staking if user waits for maturity/end date
     * @return currentRewards Rewards from staking if user decide to withdraw right now
     */
    function calculateRewards(address user)
        external
        view
        returns (uint256 totalRewards, uint256 currentRewards)
    {
        totalRewards = _calculate(user, deposits[user].endTime);
        currentRewards = _calculate(
            user,
            Math.min(block.timestamp, deposits[user].endTime)
        );
    }

    function _calculate(address from, uint256 endTime)
        private
        view
        returns (uint256 interest)
    {
        if (!hasStaked[from]) return 0;

        Deposit memory deposit = deposits[from];

        uint256 time = endTime - deposit.depositTime;

        interest =
            (deposit.depositAmount * deposit.rate * time) /
            (YEAR_IN_SECONDS * INTEREST_RATE_CONVERTER);

        return interest;
    }
}

Contract ABI

[{"inputs":[{"internalType":"string","name":"name","type":"string"},{"internalType":"contract IERC20","name":"tokenAddress_","type":"address"},{"internalType":"uint32","name":"rate","type":"uint32"},{"internalType":"uint32","name":"lockDuration","type":"uint32"},{"internalType":"uint8","name":"withdrawFeePercent","type":"uint8"},{"internalType":"address","name":"treasury_","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[{"internalType":"uint256","name":"current","type":"uint256"},{"internalType":"uint256","name":"required","type":"uint256"}],"name":"AllowanceTooLow","type":"error"},{"inputs":[{"internalType":"uint256","name":"available","type":"uint256"},{"internalType":"uint256","name":"required","type":"uint256"}],"name":"InsufficientRewardsPleaseAddRewardsOrUseEmergencyExit","type":"error"},{"inputs":[],"name":"MaturityDateExpiredPleaseWithdraw","type":"error"},{"inputs":[],"name":"MustBeLessOrEqual100","type":"error"},{"inputs":[{"internalType":"string","name":"param","type":"string"}],"name":"MustNotBeZero","type":"error"},{"inputs":[{"internalType":"address","name":"user","type":"address"}],"name":"NoStakeFoundForUser","type":"error"},{"inputs":[{"internalType":"string","name":"param","type":"string"}],"name":"NoZeroAddress","type":"error"},{"inputs":[],"name":"StakingIsPaused","type":"error"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"token","type":"address"},{"indexed":true,"internalType":"address","name":"staker","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"reward","type":"uint256"}],"name":"PaidOut","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint32","name":"newRate","type":"uint32"},{"indexed":false,"internalType":"uint32","name":"lockDuration","type":"uint32"},{"indexed":false,"internalType":"uint256","name":"time","type":"uint256"}],"name":"RateAndLockdurationChanged","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"time","type":"uint256"}],"name":"RewardsAdded","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"token","type":"address"},{"indexed":true,"internalType":"address","name":"staker","type":"address"},{"indexed":false,"internalType":"uint256","name":"stakedAmount","type":"uint256"}],"name":"Staked","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"bool","name":"status","type":"bool"},{"indexed":false,"internalType":"uint256","name":"time","type":"uint256"}],"name":"StakingStatusChanged","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint8","name":"newFee","type":"uint8"},{"indexed":false,"internalType":"uint256","name":"time","type":"uint256"}],"name":"WithdrawFeeChanged","type":"event"},{"inputs":[],"name":"INTEREST_RATE_CONVERTER","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"YEAR_IN_SECONDS","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"rewardAmount","type":"uint256"}],"name":"addReward","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"user","type":"address"}],"name":"calculateRewards","outputs":[{"internalType":"uint256","name":"totalRewards","type":"uint256"},{"internalType":"uint256","name":"currentRewards","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"user","type":"address"}],"name":"calculateWithdrawFee","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bool","name":"_status","type":"bool"}],"name":"changeStakingStatus","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"emergencyWithdraw","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"getContractInfo","outputs":[{"components":[{"internalType":"string","name":"name","type":"string"},{"internalType":"address","name":"addr","type":"address"},{"internalType":"uint32","name":"lockDuration","type":"uint32"},{"internalType":"uint32","name":"rate","type":"uint32"},{"internalType":"uint8","name":"withdrawFeePercent","type":"uint8"}],"internalType":"struct StakingContractInfo","name":"","type":"tuple"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_userAddress","type":"address"}],"name":"getUserDeposit","outputs":[{"components":[{"internalType":"uint256","name":"depositAmount","type":"uint256"},{"internalType":"uint256","name":"depositTime","type":"uint256"},{"internalType":"uint256","name":"endTime","type":"uint256"},{"internalType":"uint32","name":"rate","type":"uint32"},{"internalType":"bool","name":"paid","type":"bool"}],"internalType":"struct Deposit","name":"","type":"tuple"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"isStopped","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"rewardBalance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint32","name":"rate","type":"uint32"},{"internalType":"uint32","name":"lockDuration","type":"uint32"}],"name":"setRateAndLockduration","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint8","name":"percent","type":"uint8"}],"name":"setWithdrawFee","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"stake","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"stakedBalance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"tokenAddress","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalParticipants","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"treasury","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"}]

Contract Creation Code

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Block Transaction Gas Used Reward
Age Block Fee Address BC Fee Address Voting Power Jailed Incoming
Block Uncle Number Difficulty Gas Used Reward
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