ETH Price: $3,519.80 (-0.15%)
Gas: 3 Gwei

Contract

0x7ad522695DF4e89ea37F83de19131140A1793e77
 

Overview

ETH Balance

0 ETH

Eth Value

$0.00

Token Holdings

Multichain Info

No addresses found
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Method
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From
To
Withdraw Funds203044042024-07-14 11:19:596 days ago1720955999IN
0x7ad52269...0A1793e77
0 ETH0.000132972.66346623
Contribute196944762024-04-20 5:14:5991 days ago1713590099IN
0x7ad52269...0A1793e77
0 ETH0.000407856.83139578
Contribute196936142024-04-20 2:21:2391 days ago1713579683IN
0x7ad52269...0A1793e77
0 ETH0.000389336.52121451
Contribute196935842024-04-20 2:15:2391 days ago1713579323IN
0x7ad52269...0A1793e77
0 ETH0.000403496.75838335
Contribute196935772024-04-20 2:13:5991 days ago1713579239IN
0x7ad52269...0A1793e77
0 ETH0.000399566.69257169
Contribute196935632024-04-20 2:11:1191 days ago1713579071IN
0x7ad52269...0A1793e77
0 ETH0.000405165.49460929
Contribute196935602024-04-20 2:10:2391 days ago1713579023IN
0x7ad52269...0A1793e77
0 ETH0.000356215.96651718
Contribute196935482024-04-20 2:07:5991 days ago1713578879IN
0x7ad52269...0A1793e77
0 ETH0.000385986.4651032
Contribute196935482024-04-20 2:07:5991 days ago1713578879IN
0x7ad52269...0A1793e77
0 ETH0.00017196.5156032
Contribute196935482024-04-20 2:07:5991 days ago1713578879IN
0x7ad52269...0A1793e77
0 ETH0.000182576.9166032
Contribute196935472024-04-20 2:07:4791 days ago1713578867IN
0x7ad52269...0A1793e77
0 ETH0.000618166.80420976
Contribute196935462024-04-20 2:07:3591 days ago1713578855IN
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0 ETH0.000400466.70761219
Contribute196935462024-04-20 2:07:3591 days ago1713578855IN
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0 ETH0.000400466.70761219
Contribute196935452024-04-20 2:07:2391 days ago1713578843IN
0x7ad52269...0A1793e77
0 ETH0.000176946.70661508
Contribute196935452024-04-20 2:07:2391 days ago1713578843IN
0x7ad52269...0A1793e77
0 ETH0.000188857.15811508
Contribute196935452024-04-20 2:07:2391 days ago1713578843IN
0x7ad52269...0A1793e77
0 ETH0.000177476.72643734
Contribute196935452024-04-20 2:07:2391 days ago1713578843IN
0x7ad52269...0A1793e77
0 ETH0.000581466.75811508
Contribute196935452024-04-20 2:07:2391 days ago1713578843IN
0x7ad52269...0A1793e77
0 ETH0.000650237.15811508
Contribute196935452024-04-20 2:07:2391 days ago1713578843IN
0x7ad52269...0A1793e77
0 ETH0.000650237.15811508
Contribute196935442024-04-20 2:07:1191 days ago1713578831IN
0x7ad52269...0A1793e77
0 ETH0.000598256.5859134
Contribute196935442024-04-20 2:07:1191 days ago1713578831IN
0x7ad52269...0A1793e77
0 ETH0.000393196.5859134
Contribute196935442024-04-20 2:07:1191 days ago1713578831IN
0x7ad52269...0A1793e77
0 ETH0.000535036.5859134
Contribute196935442024-04-20 2:07:1191 days ago1713578831IN
0x7ad52269...0A1793e77
0 ETH0.000535116.5859134
Contribute196935442024-04-20 2:07:1191 days ago1713578831IN
0x7ad52269...0A1793e77
0 ETH0.000394986.6158134
Contribute196935442024-04-20 2:07:1191 days ago1713578831IN
0x7ad52269...0A1793e77
0 ETH0.000602936.6374134
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Contract Source Code Verified (Exact Match)

Contract Name:
Presale

Compiler Version
v0.8.25+commit.b61c2a91

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion, MIT license
/**
 *Submitted for verification at Etherscan.io on 2024-04-19
*/

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol


// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.20;

/**
 * @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 value of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

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

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

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

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

// File: presaleev.sol


pragma solidity ^0.8.0;


contract Presale {
    IERC20 public usdcToken; // USDC token contract interface
    address public owner;
    uint256 public maxContribution = 500 * 1e6; // 500 USDC in smallest units (assuming 6 decimals)
    uint256 public hardCap = 100000 * 1e6; // Hard cap set at 100,000 USDC
    uint256 public totalContributions;
    mapping(address => uint256) public contributions;

    // Event that logs the contribution
    event Contributed(address contributor, uint256 amount);

    constructor(address _usdcTokenAddress) {
        usdcToken = IERC20(_usdcTokenAddress);
        owner = msg.sender;
    }

    function contribute(uint256 amount) public {
        require(totalContributions + amount <= hardCap, "Contribution would exceed hard cap");
        require(contributions[msg.sender] + amount <= maxContribution, "Contribution exceeds max allowance per wallet");
        
        // Transfer USDC tokens from contributor to this contract
        bool success = usdcToken.transferFrom(msg.sender, address(this), amount);
        require(success, "USDC transfer failed");

        contributions[msg.sender] += amount;
        totalContributions += amount;
        emit Contributed(msg.sender, amount);
    }

    // Function to withdraw the funds (USDC tokens) to the owner's address
    function withdrawFunds() public {
        require(msg.sender == owner, "Only the owner can withdraw funds");
        uint256 balance = usdcToken.balanceOf(address(this));
        bool success = usdcToken.transfer(owner, balance);
        require(success, "Failed to withdraw funds");
    }

    // Modifier to restrict certain functions to only the owner
    modifier onlyOwner() {
        require(msg.sender == owner, "Only the owner is allowed to perform this action");
        _;
    }
}

Contract Security Audit

Contract ABI

[{"inputs":[{"internalType":"address","name":"_usdcTokenAddress","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"contributor","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Contributed","type":"event"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"contribute","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"contributions","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"hardCap","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"maxContribution","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalContributions","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"usdcToken","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"withdrawFunds","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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Deployed Bytecode

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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

000000000000000000000000a0b86991c6218b36c1d19d4a2e9eb0ce3606eb48

-----Decoded View---------------
Arg [0] : _usdcTokenAddress (address): 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000a0b86991c6218b36c1d19d4a2e9eb0ce3606eb48


Deployed Bytecode Sourcemap

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Swarm Source

ipfs://7f0becfb458b6436c9e304a67184a20f9bdf179fa0f6225ae58134aecdf19d2e

Block Transaction Difficulty Gas Used Reward
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Block Uncle Number Difficulty Gas Used Reward
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Transaction Hash Block Value Eth2 PubKey Valid
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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.