ETH Price: $2,355.09 (+0.60%)
Gas: 5.59 Gwei

Contract

0x4aCB68B37F42435866ee9E7bB539c235B8A69308
 

Overview

ETH Balance

0 ETH

Eth Value

$0.00

Multichain Info

No addresses found
Transaction Hash
Method
Block
From
To
Transfer114329622020-12-11 17:32:061371 days ago1607707926IN
0x4aCB68B3...5B8A69308
0.001 ETH0.00172282.00000145
Claim114319352020-12-11 13:41:261371 days ago1607694086IN
0x4aCB68B3...5B8A69308
0 ETH0.0013091655
Claim114319242020-12-11 13:38:331371 days ago1607693913IN
0x4aCB68B3...5B8A69308
0 ETH0.0026790669
Claim114314602020-12-11 11:56:121371 days ago1607687772IN
0x4aCB68B3...5B8A69308
0 ETH0.0010903628.1
Crowdsell114253282020-12-10 13:04:201372 days ago1607605460IN
0x4aCB68B3...5B8A69308
5 ETH0.0010669545
Crowdsell114251732020-12-10 12:24:211372 days ago1607603061IN
0x4aCB68B3...5B8A69308
1 ETH0.000948440
Transfer114251712020-12-10 12:23:321372 days ago1607603012IN
0x4aCB68B3...5B8A69308
0.1 ETH0.0010798745.10000023
Crowdsell114251532020-12-10 12:18:491372 days ago1607602729IN
0x4aCB68B3...5B8A69308
2 ETH0.0012566353
Crowdsell114251492020-12-10 12:17:581372 days ago1607602678IN
0x4aCB68B3...5B8A69308
2 ETH0.001422660
Crowdsell114251082020-12-10 12:10:071372 days ago1607602207IN
0x4aCB68B3...5B8A69308
11 ETH0.0010195343
Crowdsell114251032020-12-10 12:09:201372 days ago1607602160IN
0x4aCB68B3...5B8A69308
11 ETH0.0015767166.5
Set Token Open114250522020-12-10 11:57:511372 days ago1607601471IN
0x4aCB68B3...5B8A69308
0 ETH0.00178596110
Transfer114250382020-12-10 11:54:561372 days ago1607601296IN
0x4aCB68B3...5B8A69308
5 ETH0.005545962
Crowdsell114250272020-12-10 11:52:231372 days ago1607601143IN
0x4aCB68B3...5B8A69308
1 ETH0.0034139346.00000145
Crowdsell114249682020-12-10 11:39:161372 days ago1607600356IN
0x4aCB68B3...5B8A69308
9 ETH0.0040147245
Transfer114249622020-12-10 11:38:131372 days ago1607600293IN
0x4aCB68B3...5B8A69308
5 ETH0.0027546537
Crowdsell114249512020-12-10 11:35:441372 days ago1607600144IN
0x4aCB68B3...5B8A69308
1 ETH0.0040147245
Transfer114249262020-12-10 11:28:391372 days ago1607599719IN
0x4aCB68B3...5B8A69308
20 ETH0.0050986557.00000156
Crowdsell114248702020-12-10 11:14:511372 days ago1607598891IN
0x4aCB68B3...5B8A69308
1 ETH0.0044529660
Crowdsell114248682020-12-10 11:13:461372 days ago1607598826IN
0x4aCB68B3...5B8A69308
2 ETH0.0041560956
Crowdsell114248582020-12-10 11:11:131372 days ago1607598673IN
0x4aCB68B3...5B8A69308
1 ETH0.0025230228.28000124
Crowdsell114248572020-12-10 11:11:081372 days ago1607598668IN
0x4aCB68B3...5B8A69308
2 ETH0.0027656931
Crowdsell114248552020-12-10 11:10:451372 days ago1607598645IN
0x4aCB68B3...5B8A69308
2 ETH0.0031475435.28000124
Crowdsell114248502020-12-10 11:09:121372 days ago1607598552IN
0x4aCB68B3...5B8A69308
5 ETH0.0025230228.28000124
Transfer114248402020-12-10 11:06:531372 days ago1607598413IN
0x4aCB68B3...5B8A69308
2.93 ETH0.003722550
View all transactions

Latest 3 internal transactions

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Parent Transaction Hash Block From To
114319352020-12-11 13:41:261371 days ago1607694086
0x4aCB68B3...5B8A69308
100 ETH
114319242020-12-11 13:38:331371 days ago1607693913
0x4aCB68B3...5B8A69308
1,029.53853639 ETH
114314602020-12-11 11:56:121371 days ago1607687772
0x4aCB68B3...5B8A69308
100 ETH
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Contract Source Code Verified (Exact Match)

Contract Name:
SimpleSale

Compiler Version
v0.6.7+commit.b8d736ae

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion

Contract Source Code (Solidity)

/**
 *Submitted for verification at Etherscan.io on 2020-12-02
*/

// Verified using https://dapp.tools

// hevm: flattened sources of src/simple.sol
pragma solidity >0.4.13 >=0.4.23 >=0.6.0 >=0.6.7 <0.7.0;

////// lib/ds-auth/src/auth.sol
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

/* pragma solidity >=0.4.23; */

interface DSAuthority {
    function canCall(
        address src, address dst, bytes4 sig
    ) external view returns (bool);
}

contract DSAuthEvents {
    event LogSetAuthority (address indexed authority);
    event LogSetOwner     (address indexed owner);
}

contract DSAuth is DSAuthEvents {
    DSAuthority  public  authority;
    address      public  owner;

    constructor() public {
        owner = msg.sender;
        emit LogSetOwner(msg.sender);
    }

    function setOwner(address owner_)
        public
        auth
    {
        owner = owner_;
        emit LogSetOwner(owner);
    }

    function setAuthority(DSAuthority authority_)
        public
        auth
    {
        authority = authority_;
        emit LogSetAuthority(address(authority));
    }

    modifier auth {
        require(isAuthorized(msg.sender, msg.sig), "ds-auth-unauthorized");
        _;
    }

    function isAuthorized(address src, bytes4 sig) internal view returns (bool) {
        if (src == address(this)) {
            return true;
        } else if (src == owner) {
            return true;
        } else if (authority == DSAuthority(0)) {
            return false;
        } else {
            return authority.canCall(src, address(this), sig);
        }
    }
}

////// lib/ds-math/src/math.sol
/// math.sol -- mixin for inline numerical wizardry

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

/* pragma solidity >0.4.13; */

contract DSMath {
    function add(uint x, uint y) internal pure returns (uint z) {
        require((z = x + y) >= x, "ds-math-add-overflow");
    }
    function sub(uint x, uint y) internal pure returns (uint z) {
        require((z = x - y) <= x, "ds-math-sub-underflow");
    }
    function mul(uint x, uint y) internal pure returns (uint z) {
        require(y == 0 || (z = x * y) / y == x, "ds-math-mul-overflow");
    }

    function min(uint x, uint y) internal pure returns (uint z) {
        return x <= y ? x : y;
    }
    function max(uint x, uint y) internal pure returns (uint z) {
        return x >= y ? x : y;
    }
    function imin(int x, int y) internal pure returns (int z) {
        return x <= y ? x : y;
    }
    function imax(int x, int y) internal pure returns (int z) {
        return x >= y ? x : y;
    }

    uint constant WAD = 10 ** 18;
    uint constant RAY = 10 ** 27;

    //rounds to zero if x*y < WAD / 2
    function wmul(uint x, uint y) internal pure returns (uint z) {
        z = add(mul(x, y), WAD / 2) / WAD;
    }
    //rounds to zero if x*y < WAD / 2
    function rmul(uint x, uint y) internal pure returns (uint z) {
        z = add(mul(x, y), RAY / 2) / RAY;
    }
    //rounds to zero if x*y < WAD / 2
    function wdiv(uint x, uint y) internal pure returns (uint z) {
        z = add(mul(x, WAD), y / 2) / y;
    }
    //rounds to zero if x*y < RAY / 2
    function rdiv(uint x, uint y) internal pure returns (uint z) {
        z = add(mul(x, RAY), y / 2) / y;
    }

    // This famous algorithm is called "exponentiation by squaring"
    // and calculates x^n with x as fixed-point and n as regular unsigned.
    //
    // It's O(log n), instead of O(n) for naive repeated multiplication.
    //
    // These facts are why it works:
    //
    //  If n is even, then x^n = (x^2)^(n/2).
    //  If n is odd,  then x^n = x * x^(n-1),
    //   and applying the equation for even x gives
    //    x^n = x * (x^2)^((n-1) / 2).
    //
    //  Also, EVM division is flooring and
    //    floor[(n-1) / 2] = floor[n / 2].
    //
    function rpow(uint x, uint n) internal pure returns (uint z) {
        z = n % 2 != 0 ? x : RAY;

        for (n /= 2; n != 0; n /= 2) {
            x = rmul(x, x);

            if (n % 2 != 0) {
                z = rmul(z, x);
            }
        }
    }
}

////// lib/ds-token/src/token.sol
/// token.sol -- ERC20 implementation with minting and burning

// Copyright (C) 2015, 2016, 2017  DappHub, LLC

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

/* pragma solidity >=0.4.23; */

/* import "ds-math/math.sol"; */
/* import "ds-auth/auth.sol"; */


contract DSToken is DSMath, DSAuth {
    bool                                              public  stopped;
    uint256                                           public  totalSupply;
    mapping (address => uint256)                      public  balanceOf;
    mapping (address => mapping (address => uint256)) public  allowance;
    bytes32                                           public  symbol;
    uint256                                           public  decimals = 18; // standard token precision. override to customize
    bytes32                                           public  name = "";     // Optional token name

    constructor(bytes32 symbol_) public {
        symbol = symbol_;
    }

    event Approval(address indexed src, address indexed guy, uint wad);
    event Transfer(address indexed src, address indexed dst, uint wad);
    event Mint(address indexed guy, uint wad);
    event Burn(address indexed guy, uint wad);
    event Stop();
    event Start();

    modifier stoppable {
        require(!stopped, "ds-stop-is-stopped");
        _;
    }

    function approve(address guy) external returns (bool) {
        return approve(guy, uint(-1));
    }

    function approve(address guy, uint wad) public stoppable returns (bool) {
        allowance[msg.sender][guy] = wad;

        emit Approval(msg.sender, guy, wad);

        return true;
    }

    function transfer(address dst, uint wad) external returns (bool) {
        return transferFrom(msg.sender, dst, wad);
    }

    function transferFrom(address src, address dst, uint wad)
        public
        stoppable
        returns (bool)
    {
        if (src != msg.sender && allowance[src][msg.sender] != uint(-1)) {
            require(allowance[src][msg.sender] >= wad, "ds-token-insufficient-approval");
            allowance[src][msg.sender] = sub(allowance[src][msg.sender], wad);
        }

        require(balanceOf[src] >= wad, "ds-token-insufficient-balance");
        balanceOf[src] = sub(balanceOf[src], wad);
        balanceOf[dst] = add(balanceOf[dst], wad);

        emit Transfer(src, dst, wad);

        return true;
    }

    function push(address dst, uint wad) external {
        transferFrom(msg.sender, dst, wad);
    }

    function pull(address src, uint wad) external {
        transferFrom(src, msg.sender, wad);
    }

    function move(address src, address dst, uint wad) external {
        transferFrom(src, dst, wad);
    }


    function mint(uint wad) external {
        mint(msg.sender, wad);
    }

    function burn(uint wad) external {
        burn(msg.sender, wad);
    }

    function mint(address guy, uint wad) public auth stoppable {
        balanceOf[guy] = add(balanceOf[guy], wad);
        totalSupply = add(totalSupply, wad);
        emit Mint(guy, wad);
    }

    function burn(address guy, uint wad) public auth stoppable {
        if (guy != msg.sender && allowance[guy][msg.sender] != uint(-1)) {
            require(allowance[guy][msg.sender] >= wad, "ds-token-insufficient-approval");
            allowance[guy][msg.sender] = sub(allowance[guy][msg.sender], wad);
        }

        require(balanceOf[guy] >= wad, "ds-token-insufficient-balance");
        balanceOf[guy] = sub(balanceOf[guy], wad);
        totalSupply = sub(totalSupply, wad);
        emit Burn(guy, wad);
    }

    function stop() public auth {
        stopped = true;
        emit Stop();
    }

    function start() public auth {
        stopped = false;
        emit Start();
    }

    function setName(bytes32 name_) external auth {
        name = name_;
    }
}

////// src/transferhelper.sol
/* pragma solidity >=0.6.0; */

// helper methods for interacting with ERC20 tokens and sending ETH that do not consistently return true/false
library TransferHelper {
    function safeApprove(address token, address to, uint value) internal {
        // bytes4(keccak256(bytes('approve(address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x095ea7b3, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'TransferHelper: APPROVE_FAILED');
    }

    function safeTransfer(address token, address to, uint value) internal {
        // bytes4(keccak256(bytes('transfer(address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0xa9059cbb, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'TransferHelper: TRANSFER_FAILED');
    }

    function safeTransferFrom(address token, address from, address to, uint value) internal {
        // bytes4(keccak256(bytes('transferFrom(address,address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd, from, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'TransferHelper: TRANSFER_FROM_FAILED');
    }

    function safeTransferETH(address to, uint value) internal {
        (bool success,) = to.call{value:value}(new bytes(0));
        require(success, 'TransferHelper: ETH_TRANSFER_FAILED');
    }
}

////// src/simple.sol
/* pragma solidity ^0.6.7; */

/* import "ds-token/token.sol"; */
/* import "ds-auth/auth.sol"; */
/* import "./transferhelper.sol"; */

contract SimpleSale is DSAuth, DSMath
{
    mapping(address => uint) internal _tkn_sale_quantity;
    address public _default;
    
    // uint[2]{price, total_quantity}
    mapping(address => uint[2]) internal _tkn_sale_params;
    mapping(address => address) internal _tkn_owners;
    mapping(address => bool) public _tkn_open;
    mapping(address => uint) public balances;

    event SetSaleParams(address indexed token, address owner, uint price, uint quantity);
    event CrowdSell(address indexed token, uint price, uint volume, address user);
    event SetTokenOpen(address indexed token, bool open);
    event Claim(address indexed receiver, uint amount);

    modifier tokenExists(address token)
    {
        require(_tkn_owners[token] != address(0x00), "the token not exists!");
        _;
    }

    modifier tokenOpen(address token)
    {
        require(_tkn_open[token], "the token is not open for sale!");
        _;
    }

    constructor() DSAuth() payable public 
    {

    }

    receive() payable external
    {
        crowdsell(_default);
    }

    function claim(uint amount) public 
    {
        require(balances[msg.sender] > 0 && balances[msg.sender] >= amount, "The balance is insufficient.");
        
        balances[msg.sender] = sub(balances[msg.sender], amount);
        TransferHelper.safeTransferETH(msg.sender,amount);
        
        emit Claim(msg.sender, amount);
    }

    function crowdsell(address token) public payable tokenExists(token) tokenOpen(token)
    {
        sell(token, msg.value, msg.sender);
        emit CrowdSell(token, _tkn_sale_params[token][0], msg.value, msg.sender);
    }

    function sell(address token, uint msgValue, address msgSender) private
    {
        require(_tkn_owners[token] != address(0x00) && _tkn_sale_params[token][0] > 0, "Not yet started, stay tuned.");
        address tokenOwner = _tkn_owners[token];
        uint price = _tkn_sale_params[token][0];
        uint total_quantity = _tkn_sale_params[token][1];
        uint amount = wmul(msgValue, price);

        require(add(_tkn_sale_quantity[token],amount) <= total_quantity, "sold out!");
        require(DSToken(token).allowance(tokenOwner, address(this)) >= amount, "reach to uplimit of allowance.");
        TransferHelper.safeTransferFrom(token,tokenOwner, msgSender, amount);
        _tkn_sale_quantity[token] = add(_tkn_sale_quantity[token], amount);
        balances[tokenOwner] = add(balances[tokenOwner], msgValue);
    }

    function setSaleParams(address token, address owner, uint[2] memory price_uplimit, bool isDefault) public auth{
        require(token != address(0x00), "incorrect token address.");
        require(owner != address(0x00), "incorrect token owner.");
        
        if(_tkn_owners[token] == address(0x00))
        {
            _tkn_owners[token] = owner;
        }
        if(isDefault)
        {
            _default = token;
        }
        
        require(price_uplimit.length == 2 && price_uplimit[0] > 0 && price_uplimit[1] > 0, "They must be correct(price, sale quantity).");
        
        require(DSToken(token).allowance(owner, address(this)) >= price_uplimit[1], "makesure allowance enough!");
        _tkn_sale_params[token] = price_uplimit;
        
        emit SetSaleParams(token, owner, price_uplimit[0], price_uplimit[1]);
    }

    function setTokenOpen(address token, bool isOpen) public auth tokenExists(token)
    {
        _tkn_open[token] = isOpen;
        emit SetTokenOpen(token, isOpen);
    }

    function getSaleParams(address token) public view returns (uint[2] memory)
    {
        return _tkn_sale_params[token];
    }

    function getTokenOwner(address token) public view returns (address)
    {
        return _tkn_owners[token];
    }

    function getSaleQuantity(address token) public view returns (uint)
    {
        return _tkn_sale_quantity[token];
    }

}

Contract Security Audit

Contract ABI

[{"inputs":[],"stateMutability":"payable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"receiver","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Claim","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"token","type":"address"},{"indexed":false,"internalType":"uint256","name":"price","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"volume","type":"uint256"},{"indexed":false,"internalType":"address","name":"user","type":"address"}],"name":"CrowdSell","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"authority","type":"address"}],"name":"LogSetAuthority","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"}],"name":"LogSetOwner","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"token","type":"address"},{"indexed":false,"internalType":"address","name":"owner","type":"address"},{"indexed":false,"internalType":"uint256","name":"price","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"quantity","type":"uint256"}],"name":"SetSaleParams","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"token","type":"address"},{"indexed":false,"internalType":"bool","name":"open","type":"bool"}],"name":"SetTokenOpen","type":"event"},{"inputs":[],"name":"_default","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"_tkn_open","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"authority","outputs":[{"internalType":"contract DSAuthority","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"balances","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"claim","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"}],"name":"crowdsell","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"}],"name":"getSaleParams","outputs":[{"internalType":"uint256[2]","name":"","type":"uint256[2]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"}],"name":"getSaleQuantity","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"}],"name":"getTokenOwner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"contract DSAuthority","name":"authority_","type":"address"}],"name":"setAuthority","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"owner_","type":"address"}],"name":"setOwner","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"address","name":"owner","type":"address"},{"internalType":"uint256[2]","name":"price_uplimit","type":"uint256[2]"},{"internalType":"bool","name":"isDefault","type":"bool"}],"name":"setSaleParams","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"bool","name":"isOpen","type":"bool"}],"name":"setTokenOpen","outputs":[],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]

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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.