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Contract

0xae85094070FAA7f27FCbD7DC9FF5abb6fC1c9E05
 
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Create Instant T...203419682024-07-19 17:07:4710 hrs ago1721408867IN
0xae850940...6fC1c9E05
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Withdraw Instant203354452024-07-18 19:17:5931 hrs ago1721330279IN
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0 ETH0.0007250810.07342914
Withdraw Instant203196382024-07-16 14:22:233 days ago1721139743IN
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0 ETH0.0007716314.05729546
Create Instant T...202712612024-07-09 20:15:5910 days ago1720556159IN
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Create Instant T...202598682024-07-08 6:00:5911 days ago1720418459IN
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Withdraw Instant202479212024-07-06 13:59:4713 days ago1720274387IN
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Withdraw Instant202199002024-07-02 16:03:5917 days ago1719936239IN
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0 ETH0.000552289.25229924
Withdraw Instant202131012024-07-01 17:16:2318 days ago1719854183IN
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0 ETH0.000636518.84298579
Create Instant T...202098852024-07-01 6:29:2318 days ago1719815363IN
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Create Instant T...202098702024-07-01 6:26:2318 days ago1719815183IN
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0 ETH0.000235633.52390496
Create Instant T...202098652024-07-01 6:25:2318 days ago1719815123IN
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0 ETH0.00023643.53549733
Withdraw Instant202086282024-07-01 2:16:5919 days ago1719800219IN
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Withdraw Instant201679682024-06-25 10:01:4724 days ago1719309707IN
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Withdraw Instant201635272024-06-24 19:07:4725 days ago1719256067IN
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Create Instant T...201628862024-06-24 16:58:1125 days ago1719248291IN
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Create Instant T...201628322024-06-24 16:47:2325 days ago1719247643IN
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0 ETH0.0011461917.14453555
Create Instant T...201628032024-06-24 16:41:3525 days ago1719247295IN
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0 ETH0.0015133322.63203382
Create Instant T...201627842024-06-24 16:37:4725 days ago1719247067IN
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Withdraw Instant201612112024-06-24 11:21:3525 days ago1719228095IN
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Withdraw Instant201611592024-06-24 11:11:1125 days ago1719227471IN
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0 ETH0.000251524.21367888
Create Instant T...201355022024-06-20 21:05:1129 days ago1718917511IN
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0 ETH0.000373845.59190449
Create Instant T...201354802024-06-20 21:00:4729 days ago1718917247IN
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0 ETH0.000391815.86074209
Withdraw Instant200921322024-06-14 19:26:5935 days ago1718393219IN
0xae850940...6fC1c9E05
0 ETH0.0007300510.14246779
Create Instant T...200850202024-06-13 19:36:1136 days ago1718307371IN
0xae850940...6fC1c9E05
0 ETH0.0008838313.22259968
Create Instant T...200497062024-06-08 21:10:1141 days ago1717881011IN
0xae850940...6fC1c9E05
0 ETH0.000494175.88622676
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Contract Source Code Verified (Exact Match)

Contract Name:
MoneyInstant

Compiler Version
v0.8.17+commit.8df45f5f

Optimization Enabled:
Yes with 200 runs

Other Settings:
byzantium EvmVersion
File 1 of 10 : MoneyInstant.sol
// SPDX-License-Identifier: MIT

// File: MoneyInstant.sol

pragma solidity 0.8.17;

// Libs Dependencies
import '@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol';
import '@openzeppelin/contracts/token/ERC20/IERC20.sol';
import '@openzeppelin/contracts/security/ReentrancyGuard.sol';
import '@openzeppelin/contracts/access/Ownable.sol';

// Protocol Components
import './IMoneyInstant.sol';
import './Types.sol';

/**
 * @title MoneyInstant
 * @notice MoneyInstant implementation for ERC20 tokens.
 */
contract MoneyInstant is IMoneyInstant, ReentrancyGuard, Ownable {
    using SafeERC20 for IERC20;

    mapping(address => mapping(address => uint256)) private userToTokens;

    mapping(address => uint256) private userToNative;

    function createInstantTransfer(
        string calldata id,
        address tokenAddress,
        Types.Payment[] memory payments
    ) external {
        require(payments.length > 0, 'no any payments');

        uint256 totalDeposit;
        for (uint256 i = 0; i < payments.length; i++) {
            address recipient = payments[i].recipient;
            require(
                recipient != address(0x00),
                'cannot send to the zero address'
            );
            require(
                recipient != address(this),
                'cannot send to the contract itself'
            );
            require(
                recipient != msg.sender,
                'cannot send to the caller address'
            );

            uint256 deposit = payments[i].deposit;
            require(deposit > 0, 'deposit is zero');

            totalDeposit += deposit;
            userToTokens[recipient][tokenAddress] += deposit;
        }
        emit InstantTransfer(id, msg.sender, tokenAddress, totalDeposit);
        IERC20(tokenAddress).safeTransferFrom(
            msg.sender,
            address(this),
            totalDeposit
        );
    }

    function withdrawInstant(address tokenAddress, uint256 amount)
        external
        nonReentrant
    {
        require(amount > 0, 'amount is zero');
        uint256 balance = userToTokens[msg.sender][tokenAddress];
        require(balance >= amount, 'amount exceeds the available balance');
        unchecked {
            userToTokens[msg.sender][tokenAddress] = balance - amount;
        }
        emit InstantWithdraw(msg.sender, tokenAddress, amount);
        IERC20(tokenAddress).safeTransfer(msg.sender, amount);
    }

    function getTokenBalance(address recipient, address tokenAddress)
        external
        view
        returns (uint256 balance)
    {
        balance = userToTokens[recipient][tokenAddress];
    }

    function createNativeTokenTransfer(
        string calldata id,
        Types.Payment[] memory payments
    ) external payable {
        require(payments.length > 0, 'no any payments');

        uint256 totalDeposit;
        for (uint256 i = 0; i < payments.length; i++) {
            address recipient = payments[i].recipient;
            require(
                recipient != address(0x00),
                'cannot send to the zero address'
            );
            require(
                recipient != address(this),
                'cannot send to the contract itself'
            );
            require(
                recipient != msg.sender,
                'cannot send to the caller address'
            );

            uint256 deposit = payments[i].deposit;
            require(deposit > 0, 'deposit is zero');

            totalDeposit += deposit;
            userToNative[recipient] += deposit;
        }
        require(totalDeposit == msg.value, 'not enough balance passed');

        emit NativeInstantTransfer(id, msg.sender, msg.value);
    }

    function withdrawNativeInstant(uint256 amount) external nonReentrant {
        require(amount > 0, 'amount is zero');
        uint256 balance = userToNative[msg.sender];
        require(balance >= amount, 'amount exceeds the available balance');
        unchecked {
            userToNative[msg.sender] = balance - amount;
        }
        (bool success, ) = msg.sender.call{value: amount}('');
        require(success, 'Transfer failed.');
        emit NativeInstantWithdraw(msg.sender, amount);
    }

    function getNativeBalance(address recipient)
        external
        view
        returns (uint256 balance)
    {
        balance = userToNative[recipient];
    }

    function payNiural(
        string calldata id,
        address tokenAddress,
        uint256 amount
    ) public {
        require(amount > 0, 'amount is zero');
        emit PayNiural(id, msg.sender, tokenAddress, amount);
        IERC20(tokenAddress).safeTransferFrom(msg.sender, owner(), amount);
    }

    function pay(
        string calldata id,
        address tokenAddress,
        address recipient,
        uint256 amount
    ) public {
        require(amount > 0, 'amount is zero');
        require(recipient != address(0x00), 'cannot send to the zero address');
        require(recipient != msg.sender, 'cannot send to the caller address');
        emit Pay(id, msg.sender, tokenAddress, recipient, amount);
        IERC20(tokenAddress).safeTransferFrom(msg.sender, recipient, amount);
    }
}

File 2 of 10 : SafeERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/draft-IERC20Permit.sol";
import "../../../utils/Address.sol";

/**
 * @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));
        }
    }

    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

    /**
     * @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 3 of 10 : IERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) external returns (bool);
}

File 4 of 10 : ReentrancyGuard.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (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() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}

File 5 of 10 : Ownable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../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.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

File 6 of 10 : IMoneyInstant.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.8.17;

// File: IMoneyInstant.sol

import './Types.sol';

/**
 * @title IMoneyInstant provides an interface to receive tokens and disburse tokens to multiple recipients at once.
 */

interface IMoneyInstant {
    /**
     * @notice Emits when an instant transfer is successfully created.
     */
    event InstantTransfer(
        string indexed id,
        address indexed sender,
        address indexed tokenAddress,
        uint256 deposit
    );

    /**
     * @notice Emits when the recipient withdraws a portion or all their tokens.
     */
    event InstantWithdraw(
        address indexed recipient,
        address indexed tokenAddress,
        uint256 amount
    );

    /**
     * @notice Emits when an native instant transfer is successfully created.
     */
    event NativeInstantTransfer(
        string indexed id,
        address indexed sender,
        uint256 deposit
    );

    /**
     * @notice Emits when the recipient withdraws a portion or all their native tokens.
     */
    event NativeInstantWithdraw(address indexed recipient, uint256 amount);

    /**
     * @notice Emits when the Owner gets paid.
     */
    event PayNiural(
        string indexed id,
        address indexed sender,
        address indexed tokenAddress,
        uint256 amount
    );

    /**
     * @notice Emits when the recipient receives the token through pay function.
     */
    event Pay(
        string indexed id,
        address indexed sender,
        address indexed tokenAddress,
        address recipient,
        uint256 amount
    );

    /**
     * @notice Creates a new instant transfer funded by `msg.sender` and paid towards `recipients`.
     * @dev The length of the payments is capped by the block gas limit.
     * Emits an {InstantTransfer} event
     *  Throws if the payments size is zero
     *  Throws if the recipient is the zero address, the contract itself or the caller.
     *  Throws if the contract is not allowed to transfer enough tokens.
     *  Throws if there is a token transfer failure.
     * @param tokenAddress The ERC20 token to used.
     * @param payments Array of recipient address and corresponding deposit
     */
    function createInstantTransfer(
        string calldata id,
        address tokenAddress,
        Types.Payment[] memory payments
    ) external;

    /**
     * @notice Withdraws from the contract to the recipient's account.
     * @dev Emits an {InstantWithdraw} event
     *  Throws if the amount is zero.
     *  Throws if the amount exceeds the available balance for the token.
     *  Throws if there is a token transfer failure.
     * @param tokenAddress The id of the stream to withdraw tokens from.
     * @param amount The amount of tokens to withdraw.
     */
    function withdrawInstant(address tokenAddress, uint256 amount) external;

    /**
     * @notice Gets TokenBalance of a specific token for the user.
     * @param recipient The address of the receiver wallet.
     * @param tokenAddress The address of the token to check balance of.
     * @return balance TokenBalance for the token.
     */
    function getTokenBalance(address recipient, address tokenAddress)
        external
        view
        returns (uint256 balance);

    /**
     * @notice Creates a new native token instant transfer funded by `msg.sender` and paid towards `recipients`.
     * The length of the deposits is capped by the block gas limit.
     * Emits an {nativeInstantTransfer} event
     *  Throws if the payments size is zero
     *  Throws if the recipient is the zero address, the contract itself or the caller.
     *  Throws if the contract did not receive native token as sum of payment tokens.
     *  Throws if there is a token transfer failure.
     * @param payments Array of recipient address and corresponding deposit
     */
    function createNativeTokenTransfer(
        string calldata id,
        Types.Payment[] memory payments
    ) external payable;

    /**
     * @notice Withdraws from the contract to the recipient's account.
     * @dev Emits an {NativeInstantWithdraw} event
     *  Throws if the amount is zero.
     *  Throws if the amount exceeds the available balance for the native token.
     *  Throws if there is a token transfer failure.
     * @param amount The amount of tokens to withdraw.
     */
    function withdrawNativeInstant(uint256 amount) external;

    /**
     * @notice Gets Native TokenBalance of user.
     * @param recipient The address of the receiver wallet.
     * @return balance TokenBalance for the token.
     */
    function getNativeBalance(address recipient)
        external
        view
        returns (uint256 balance);

    /**
     * @notice Pay niural fee to owner.
     * @dev Emits an {Payniural} event
     *  Throws if the amount is zero.
     * @param amount The amount of tokens to pay.
     * @param tokenAddress The ERC20 token to be used.
     */
    function payNiural(
        string calldata id,
        address tokenAddress,
        uint256 amount
    ) external;

    /**
     * @notice Pay @param recipient @param amount.
     *  Throws if the amount is zero.
     * @param amount The amount of tokens to pay.
     * @param tokenAddress The ERC20 token to be used.
     * @param recipient The address of the recipient
     */
    function pay(
        string calldata id,
        address tokenAddress,
        address recipient,
        uint256 amount
    ) external;
}

File 7 of 10 : Types.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.8.17;

// File: Types.sol

/**
 * @title MoneyInstant Types
 */
library Types {
    struct Payment {
        address recipient;
        uint256 deposit;
    }
}

File 8 of 10 : draft-IERC20Permit.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

File 9 of 10 : Address.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (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
                /// @solidity memory-safe-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

File 10 of 10 : Context.sol
// SPDX-License-Identifier: MIT
// 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;
    }
}

Settings
{
  "evmVersion": "byzantium",
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

Contract Security Audit

Contract ABI

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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.