ETH Price: $2,237.13 (+6.18%)

Contract

0x9DA9fF881a9cb08D2283011Ad79018a213d8B314

Overview

ETH Balance

0.0940000263 ETH

ETH Value

$210.29 (@ $2,237.13/ETH)

Token Holdings

Multichain Info

No addresses found
Transaction Hash
Method
Block
From
To
Purchase Credits29943612025-03-01 5:23:101 hr ago1740806590IN
0x9DA9fF88...213d8B314
0.00335 ETH0.000006280.04525
Purchase Credits29927392025-03-01 4:55:491 hr ago1740804949IN
0x9DA9fF88...213d8B314
0.00335 ETH0.000006280.04525
Purchase Credits29911772025-03-01 4:29:262 hrs ago1740803366IN
0x9DA9fF88...213d8B314
0.00335 ETH0.000005450.04525
Purchase Credits29909462025-03-01 4:25:352 hrs ago1740803135IN
0x9DA9fF88...213d8B314
0.00335 ETH0.000006280.04525
Purchase Credits29901872025-03-01 4:12:462 hrs ago1740802366IN
0x9DA9fF88...213d8B314
0.00335 ETH0.000006280.04525
Purchase Credits29892782025-03-01 3:57:182 hrs ago1740801438IN
0x9DA9fF88...213d8B314
0.0225 ETH0.000005030.04525
Purchase Credits29865452025-03-01 3:11:153 hrs ago1740798675IN
0x9DA9fF88...213d8B314
0.0112 ETH0.000005630.04525
Purchase Credits29864252025-03-01 3:09:153 hrs ago1740798555IN
0x9DA9fF88...213d8B314
0.00335 ETH0.000004190.04525
Purchase Credits29863642025-03-01 3:08:143 hrs ago1740798494IN
0x9DA9fF88...213d8B314
0.00335 ETH0.000005030.04525
Purchase Credits29850492025-03-01 2:46:103 hrs ago1740797170IN
0x9DA9fF88...213d8B314
0.00335 ETH0.000006290.04525
Purchase Credits29848722025-03-01 2:43:033 hrs ago1740796983IN
0x9DA9fF88...213d8B314
0.00335 ETH0.000005410.04525
Purchase Credits29832292025-03-01 2:15:314 hrs ago1740795331IN
0x9DA9fF88...213d8B314
0.00335 ETH0.000005470.047
Purchase Credits29821552025-03-01 1:57:224 hrs ago1740794242IN
0x9DA9fF88...213d8B314
0.00335 ETH0.000005030.04525
Purchase Credits29812982025-03-01 1:42:544 hrs ago1740793374IN
0x9DA9fF88...213d8B314
0.00335 ETH0.000005450.04525
Purchase Credits29807352025-03-01 1:33:295 hrs ago1740792809IN
0x9DA9fF88...213d8B314
0.00335 ETH0.000004190.04525
Purchase Credits29806752025-03-01 1:32:295 hrs ago1740792749IN
0x9DA9fF88...213d8B314
0.00335 ETH0.000005450.04525
Purchase Credits29804992025-03-01 1:29:335 hrs ago1740792573IN
0x9DA9fF88...213d8B314
0.00335 ETH0.000006280.04525
Purchase Credits29803852025-03-01 1:27:305 hrs ago1740792450IN
0x9DA9fF88...213d8B314
0.00335 ETH0.000004190.04525
Purchase Credits29801942025-03-01 1:24:195 hrs ago1740792259IN
0x9DA9fF88...213d8B314
0.00335 ETH0.000005760.047
Purchase Credits29790652025-03-01 1:05:215 hrs ago1740791121IN
0x9DA9fF88...213d8B314
0.00335 ETH0.000005030.04525
Update Packages29696452025-02-28 22:26:538 hrs ago1740781613IN
0x9DA9fF88...213d8B314
0 ETH0.00000560.04525
Purchase Credits29694842025-02-28 22:24:128 hrs ago1740781452IN
0x9DA9fF88...213d8B314
0 ETH0.000003990.04525
Purchase Credits29694692025-02-28 22:23:578 hrs ago1740781437IN
0x9DA9fF88...213d8B314
0 ETH0.000004180.04525
Purchase Credits29694522025-02-28 22:23:408 hrs ago1740781420IN
0x9DA9fF88...213d8B314
0 ETH0.000004620.04525
Purchase Credits29692232025-02-28 22:19:518 hrs ago1740781191IN
0x9DA9fF88...213d8B314
0 ETH0.000004160.04525
View all transactions

Latest 25 internal transactions (View All)

Parent Transaction Hash Block From To
29943612025-03-01 5:23:101 hr ago1740806590
0x9DA9fF88...213d8B314
0.00335 ETH
29927392025-03-01 4:55:491 hr ago1740804949
0x9DA9fF88...213d8B314
0.00335 ETH
29911772025-03-01 4:29:262 hrs ago1740803366
0x9DA9fF88...213d8B314
0.00335 ETH
29909462025-03-01 4:25:352 hrs ago1740803135
0x9DA9fF88...213d8B314
0.00335 ETH
29901872025-03-01 4:12:462 hrs ago1740802366
0x9DA9fF88...213d8B314
0.00335 ETH
29892782025-03-01 3:57:182 hrs ago1740801438
0x9DA9fF88...213d8B314
0.0225 ETH
29865452025-03-01 3:11:153 hrs ago1740798675
0x9DA9fF88...213d8B314
0.0112 ETH
29864252025-03-01 3:09:153 hrs ago1740798555
0x9DA9fF88...213d8B314
0.00335 ETH
29863642025-03-01 3:08:143 hrs ago1740798494
0x9DA9fF88...213d8B314
0.00335 ETH
29850492025-03-01 2:46:103 hrs ago1740797170
0x9DA9fF88...213d8B314
0.00335 ETH
29848722025-03-01 2:43:033 hrs ago1740796983
0x9DA9fF88...213d8B314
0.00335 ETH
29832292025-03-01 2:15:314 hrs ago1740795331
0x9DA9fF88...213d8B314
0.00335 ETH
29821552025-03-01 1:57:224 hrs ago1740794242
0x9DA9fF88...213d8B314
0.00335 ETH
29812982025-03-01 1:42:544 hrs ago1740793374
0x9DA9fF88...213d8B314
0.00335 ETH
29807352025-03-01 1:33:295 hrs ago1740792809
0x9DA9fF88...213d8B314
0.00335 ETH
29806752025-03-01 1:32:295 hrs ago1740792749
0x9DA9fF88...213d8B314
0.00335 ETH
29804992025-03-01 1:29:335 hrs ago1740792573
0x9DA9fF88...213d8B314
0.00335 ETH
29803852025-03-01 1:27:305 hrs ago1740792450
0x9DA9fF88...213d8B314
0.00335 ETH
29801942025-03-01 1:24:195 hrs ago1740792259
0x9DA9fF88...213d8B314
0.00335 ETH
29790652025-03-01 1:05:215 hrs ago1740791121
0x9DA9fF88...213d8B314
0.00335 ETH
29694842025-02-28 22:24:128 hrs ago1740781452
0x9DA9fF88...213d8B314
0 ETH
29694692025-02-28 22:23:578 hrs ago1740781437
0x9DA9fF88...213d8B314
0 ETH
29694522025-02-28 22:23:408 hrs ago1740781420
0x9DA9fF88...213d8B314
0 ETH
29692232025-02-28 22:19:518 hrs ago1740781191
0x9DA9fF88...213d8B314
0 ETH
29692102025-02-28 22:19:388 hrs ago1740781178
0x9DA9fF88...213d8B314
0 ETH
View All Internal Transactions
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Contract Source Code Verified (Exact Match)

Contract Name:
Credits

Compiler Version
v0.8.24+commit.e11b9ed9

ZkSolc Version
v1.5.7

Optimization Enabled:
Yes with Mode 3

Other Settings:
paris EvmVersion
File 1 of 5 : Credits.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import "@openzeppelin/contracts/utils/Pausable.sol";

/**
 * @title Credits
 * @dev Contract for purchasing credits with ETH that emits events for external tracking
 */
contract Credits is Ownable, ReentrancyGuard, Pausable {
    struct Package {
        uint256 credits;
        uint256 price;
    }

    Package[3] public packages;

    // Updated events
    event CreditsPurchased(
        address indexed buyer,
        uint256 packageIndex,
        uint256 credits,
        uint256 price,
        uint256 timestamp
    );

    event PackagesUpdated(
        uint256[3] credits,
        uint256[3] prices,
        uint256 timestamp
    );

    /**
     * @dev Constructor initializes default packages
     */
    constructor() Ownable(msg.sender) {
        packages[0] = Package(5, 0.00000000005 ether); // 5 credits package
        packages[1] = Package(20, 0.0000000018 ether); // 20 credits package
        packages[2] = Package(50, 0.000000004 ether); // 50 credits package
    }

    /**
     * @dev Get the details of a package
     */
    function getPackageDetails(
        uint256 _packageIndex
    ) public view returns (Package memory) {
        require(_packageIndex < 3, "Invalid package index");
        return packages[_packageIndex];
    }

    /**
     * @dev Purchase credits with ETH
     */
    function purchaseCredits(
        uint256 _packageIndex
    ) external payable nonReentrant whenNotPaused {
        require(_packageIndex < 3, "Invalid package index");
        Package memory package = packages[_packageIndex];

        require(msg.value >= package.price, "Insufficient payment");

        emit CreditsPurchased(
            msg.sender,
            _packageIndex,
            package.credits,
            package.price,
            block.timestamp
        );

        // Refund excess payment if any
        uint256 excess = msg.value - package.price;
        if (excess > 0) {
            (bool success, ) = payable(msg.sender).call{value: excess}("");
            require(success, "Refund failed");
        }
    }

    /**
     * @dev Update all package configurations at once
     */
    function updatePackages(
        uint256[3] calldata _credits,
        uint256[3] calldata _prices
    ) external onlyOwner {
        for (uint256 i = 0; i < 3; i++) {
            require(_credits[i] > 0, "Credits must be greater than 0");
            require(_prices[i] > 0, "Price must be greater than 0");

            packages[i] = Package(_credits[i], _prices[i]);
        }

        emit PackagesUpdated(_credits, _prices, block.timestamp);
    }

    /**
     * @dev Withdraw contract balance (owner only)
     */
    function withdraw() external onlyOwner nonReentrant {
        uint256 balance = address(this).balance;
        require(balance > 0, "No balance to withdraw");

        (bool success, ) = payable(owner()).call{value: balance}("");
        require(success, "Withdrawal failed");
    }

    /**
     * @dev Pause contract (owner only)
     */
    function pause() external onlyOwner {
        _pause();
    }

    /**
     * @dev Unpause contract (owner only)
     */
    function unpause() external onlyOwner {
        _unpause();
    }
}

File 2 of 5 : Ownable.sol
// 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);
    }
}

File 3 of 5 : ReentrancyGuard.sol
// 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;
    }
}

File 4 of 5 : Pausable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (utils/Pausable.sol)

pragma solidity ^0.8.20;

import {Context} from "../utils/Context.sol";

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    bool private _paused;

    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    /**
     * @dev The operation failed because the contract is paused.
     */
    error EnforcedPause();

    /**
     * @dev The operation failed because the contract is not paused.
     */
    error ExpectedPause();

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor() {
        _paused = false;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        _requireNotPaused();
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        _requirePaused();
        _;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Throws if the contract is paused.
     */
    function _requireNotPaused() internal view virtual {
        if (paused()) {
            revert EnforcedPause();
        }
    }

    /**
     * @dev Throws if the contract is not paused.
     */
    function _requirePaused() internal view virtual {
        if (!paused()) {
            revert ExpectedPause();
        }
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}

File 5 of 5 : Context.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.1) (utils/Context.sol)

pragma solidity ^0.8.20;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}

Settings
{
  "evmVersion": "paris",
  "optimizer": {
    "enabled": true,
    "mode": "3"
  },
  "outputSelection": {
    "*": {
      "*": [
        "abi",
        "metadata"
      ],
      "": [
        "ast"
      ]
    }
  },
  "detectMissingLibraries": false,
  "forceEVMLA": false,
  "enableEraVMExtensions": false,
  "libraries": {}
}

Contract Security Audit

Contract ABI

[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"EnforcedPause","type":"error"},{"inputs":[],"name":"ExpectedPause","type":"error"},{"inputs":[{"internalType":"address","name":"owner","type":"address"}],"name":"OwnableInvalidOwner","type":"error"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"OwnableUnauthorizedAccount","type":"error"},{"inputs":[],"name":"ReentrancyGuardReentrantCall","type":"error"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"buyer","type":"address"},{"indexed":false,"internalType":"uint256","name":"packageIndex","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"credits","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"price","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"timestamp","type":"uint256"}],"name":"CreditsPurchased","type":"event"},{"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":false,"internalType":"uint256[3]","name":"credits","type":"uint256[3]"},{"indexed":false,"internalType":"uint256[3]","name":"prices","type":"uint256[3]"},{"indexed":false,"internalType":"uint256","name":"timestamp","type":"uint256"}],"name":"PackagesUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"account","type":"address"}],"name":"Paused","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"account","type":"address"}],"name":"Unpaused","type":"event"},{"inputs":[{"internalType":"uint256","name":"_packageIndex","type":"uint256"}],"name":"getPackageDetails","outputs":[{"components":[{"internalType":"uint256","name":"credits","type":"uint256"},{"internalType":"uint256","name":"price","type":"uint256"}],"internalType":"struct Credits.Package","name":"","type":"tuple"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"packages","outputs":[{"internalType":"uint256","name":"credits","type":"uint256"},{"internalType":"uint256","name":"price","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"pause","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"paused","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_packageIndex","type":"uint256"}],"name":"purchaseCredits","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"unpause","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256[3]","name":"_credits","type":"uint256[3]"},{"internalType":"uint256[3]","name":"_prices","type":"uint256[3]"}],"name":"updatePackages","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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Deployed Bytecode

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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.