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Gas: 0.04 Gwei
 

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Gems (GEM) ($0.00)

Multichain Info

1 address found via
Transaction Hash
Method
Block
From
To
Transfer243622212026-02-01 13:09:4722 days ago1769951387IN
Gems Token
0 ETH0.000062851.20792482
Transfer240659812025-12-22 5:11:5963 days ago1766380319IN
Gems Token
0 ETH0.000072071.52622149
Approve239279172025-12-02 19:39:4783 days ago1764704387IN
Gems Token
0 ETH0.000004380.15
Approve238884992025-11-27 7:15:4788 days ago1764227747IN
Gems Token
0 ETH0.00000510.11
Approve238855722025-11-26 21:23:5988 days ago1764192239IN
Gems Token
0 ETH0.000002510.05431218
Approve238855512025-11-26 21:19:4789 days ago1764191987IN
Gems Token
0 ETH0.000002370.05133348
Transfer238670042025-11-24 6:41:3591 days ago1763966495IN
Gems Token
0 ETH0.000056581.08760948
Approve237859822025-11-12 21:59:47102 days ago1762984787IN
Gems Token
0 ETH0.000049441.06817565
Transfer237859522025-11-12 21:53:47102 days ago1762984427IN
Gems Token
0.00019718 ETH0.000022881.08965704
Transfer237859432025-11-12 21:51:59102 days ago1762984319IN
Gems Token
0.00022006 ETH0.000022821.0867847
Transfer237002662025-10-31 22:19:35114 days ago1761949175IN
Gems Token
0 ETH0.000046810.99155051
Transfer235742922025-10-14 6:56:23132 days ago1760424983IN
Gems Token
0 ETH0.00009932.10339761
Approve235258262025-10-07 12:17:59139 days ago1759839479IN
Gems Token
0 ETH0.000085381.84159828
Transfer235188692025-10-06 12:56:23140 days ago1759755383IN
Gems Token
0 ETH0.000138192.65755003
Approve233132032025-09-07 19:07:47169 days ago1757272067IN
Gems Token
0 ETH0.000016730.64181998
Transfer233036752025-09-06 11:10:47170 days ago1757157047IN
Gems Token
0 ETH0.000013540.26044023
Transfer231777722025-08-19 21:21:11187 days ago1755638471IN
Gems Token
0 ETH0.000070091.48464141
Approve230464162025-08-01 13:05:23206 days ago1754053523IN
Gems Token
0 ETH0.000033511.28509448
Approve230326352025-07-30 14:47:47208 days ago1753886867IN
Gems Token
0 ETH0.000100013.83481529
Approve230008552025-07-26 4:13:35212 days ago1753503215IN
Gems Token
0 ETH0.000018540.4
Transfer229725292025-07-22 5:06:35216 days ago1753160795IN
Gems Token
0 ETH0.00011642.23702958
Transfer229141992025-07-14 1:41:35224 days ago1752457295IN
Gems Token
0 ETH0.000072411.39225652
Approve228283342025-07-02 1:42:47236 days ago1751420567IN
Gems Token
0 ETH0.000014630.5
Transfer228166372025-06-30 10:28:11238 days ago1751279291IN
Gems Token
0 ETH0.000105872.03562358
Transfer227819322025-06-25 14:05:23243 days ago1750860323IN
Gems Token
0 ETH0.000255135.40529713
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Contract Source Code Verified (Exact Match)

Contract Name:
GemsToken

Compiler Version
v0.4.18+commit.9cf6e910

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion
/**
 *Submitted for verification at Etherscan.io on 2018-02-16
*/

pragma solidity 0.4.18;

library SafeMath {

  /**
  * @dev Multiplies two numbers, throws on overflow.
  */
  function mul(uint256 a, uint256 b) internal pure returns (uint256) {
    if (a == 0) {
      return 0;
    }
    uint256 c = a * b;
    assert(c / a == b);
    return c;
  }

  /**
  * @dev Integer division of two numbers, truncating the quotient.
  */
  function div(uint256 a, uint256 b) internal pure returns (uint256) {
    // assert(b > 0); // Solidity automatically throws when dividing by 0
    uint256 c = a / b;
    // assert(a == b * c + a % b); // There is no case in which this doesn't hold
    return c;
  }

  /**
  * @dev Substracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend).
  */
  function sub(uint256 a, uint256 b) internal pure returns (uint256) {
    assert(b <= a);
    return a - b;
  }

  /**
  * @dev Adds two numbers, throws on overflow.
  */
  function add(uint256 a, uint256 b) internal pure returns (uint256) {
    uint256 c = a + b;
    assert(c >= a);
    return c;
  }
}

contract ERC20Basic {
  function totalSupply() public view returns (uint256);
  function balanceOf(address who) public view returns (uint256);
  function transfer(address to, uint256 value) public returns (bool);
  event Transfer(address indexed from, address indexed to, uint256 value);
}


/**
 * @title Basic token
 * @dev Basic version of StandardToken, with no allowances.
 */
contract BasicToken is ERC20Basic {
  using SafeMath for uint256;

  mapping(address => uint256) balances;

  uint256 totalSupply_;

  /**
  * @dev total number of tokens in existence
  */
  function totalSupply() public view returns (uint256) {
    return totalSupply_;
  }

  /**
  * @dev transfer token for a specified address
  * @param _to The address to transfer to.
  * @param _value The amount to be transferred.
  */
  function transfer(address _to, uint256 _value) public returns (bool) {
    require(_to != address(0));
    require(_value <= balances[msg.sender]);

    // SafeMath.sub will throw if there is not enough balance.
    balances[msg.sender] = balances[msg.sender].sub(_value);
    balances[_to] = balances[_to].add(_value);
    Transfer(msg.sender, _to, _value);
    return true;
  }

  /**
  * @dev Gets the balance of the specified address.
  * @param _owner The address to query the the balance of.
  * @return An uint256 representing the amount owned by the passed address.
  */
  function balanceOf(address _owner) public view returns (uint256 balance) {
    return balances[_owner];
  }

}

contract ERC20 is ERC20Basic {
  function allowance(address owner, address spender) public view returns (uint256);
  function transferFrom(address from, address to, uint256 value) public returns (bool);
  function approve(address spender, uint256 value) public returns (bool);
  event Approval(address indexed owner, address indexed spender, uint256 value);
}

contract StandardToken is ERC20, BasicToken {

  mapping (address => mapping (address => uint256)) internal allowed;


  /**
   * @dev Transfer tokens from one address to another
   * @param _from address The address which you want to send tokens from
   * @param _to address The address which you want to transfer to
   * @param _value uint256 the amount of tokens to be transferred
   */
  function transferFrom(address _from, address _to, uint256 _value) public returns (bool) {
    require(_to != address(0));
    require(_value <= balances[_from]);
    require(_value <= allowed[_from][msg.sender]);

    balances[_from] = balances[_from].sub(_value);
    balances[_to] = balances[_to].add(_value);
    allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
    Transfer(_from, _to, _value);
    return true;
  }

  /**
   * @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
   *
   * 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
   * @param _spender The address which will spend the funds.
   * @param _value The amount of tokens to be spent.
   */
  function approve(address _spender, uint256 _value) public returns (bool) {
    allowed[msg.sender][_spender] = _value;
    Approval(msg.sender, _spender, _value);
    return true;
  }

  /**
   * @dev Function to check the amount of tokens that an owner allowed to a spender.
   * @param _owner address The address which owns the funds.
   * @param _spender address The address which will spend the funds.
   * @return A uint256 specifying the amount of tokens still available for the spender.
   */
  function allowance(address _owner, address _spender) public view returns (uint256) {
    return allowed[_owner][_spender];
  }

  /**
   * @dev Increase the amount of tokens that an owner allowed to a spender.
   *
   * approve should be called when allowed[_spender] == 0. To increment
   * allowed value is better to use this function to avoid 2 calls (and wait until
   * the first transaction is mined)
   * From MonolithDAO Token.sol
   * @param _spender The address which will spend the funds.
   * @param _addedValue The amount of tokens to increase the allowance by.
   */
  function increaseApproval(address _spender, uint _addedValue) public returns (bool) {
    allowed[msg.sender][_spender] = allowed[msg.sender][_spender].add(_addedValue);
    Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
    return true;
  }

  /**
   * @dev Decrease the amount of tokens that an owner allowed to a spender.
   *
   * approve should be called when allowed[_spender] == 0. To decrement
   * allowed value is better to use this function to avoid 2 calls (and wait until
   * the first transaction is mined)
   * From MonolithDAO Token.sol
   * @param _spender The address which will spend the funds.
   * @param _subtractedValue The amount of tokens to decrease the allowance by.
   */
  function decreaseApproval(address _spender, uint _subtractedValue) public returns (bool) {
    uint oldValue = allowed[msg.sender][_spender];
    if (_subtractedValue > oldValue) {
      allowed[msg.sender][_spender] = 0;
    } else {
      allowed[msg.sender][_spender] = oldValue.sub(_subtractedValue);
    }
    Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
    return true;
  }

}
contract Ownable {
  address public owner;


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


  /**
   * @dev The Ownable constructor sets the original `owner` of the contract to the sender
   * account.
   */
  function Ownable() public {
    owner = msg.sender;
  }

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

  /**
   * @dev Allows the current owner to transfer control of the contract to a newOwner.
   * @param newOwner The address to transfer ownership to.
   */
  function transferOwnership(address newOwner) public onlyOwner {
    require(newOwner != address(0));
    OwnershipTransferred(owner, newOwner);
    owner = newOwner;
  }

}
contract HasNoContracts is Ownable {

  /**
   * @dev Reclaim ownership of Ownable contracts
   * @param contractAddr The address of the Ownable to be reclaimed.
   */
  function reclaimContract(address contractAddr) external onlyOwner {
    Ownable contractInst = Ownable(contractAddr);
    contractInst.transferOwnership(owner);
  }
}
contract HasNoEther is Ownable {

  /**
  * @dev Constructor that rejects incoming Ether
  * @dev The `payable` flag is added so we can access `msg.value` without compiler warning. If we
  * leave out payable, then Solidity will allow inheriting contracts to implement a payable
  * constructor. By doing it this way we prevent a payable constructor from working. Alternatively
  * we could use assembly to access msg.value.
  */
  function HasNoEther() public payable {
    require(msg.value == 0);
  }

  /**
   * @dev Disallows direct send by settings a default function without the `payable` flag.
   */
  function() external {
  }

  /**
   * @dev Transfer all Ether held by the contract to the owner.
   */
  function reclaimEther() external onlyOwner {
    assert(owner.send(this.balance));
  }
}
library SafeERC20 {
  function safeTransfer(ERC20Basic token, address to, uint256 value) internal {
    assert(token.transfer(to, value));
  }

  function safeTransferFrom(ERC20 token, address from, address to, uint256 value) internal {
    assert(token.transferFrom(from, to, value));
  }

  function safeApprove(ERC20 token, address spender, uint256 value) internal {
    assert(token.approve(spender, value));
  }
}
contract CanReclaimToken is Ownable {
  using SafeERC20 for ERC20Basic;

  /**
   * @dev Reclaim all ERC20Basic compatible tokens
   * @param token ERC20Basic The address of the token contract
   */
  function reclaimToken(ERC20Basic token) external onlyOwner {
    uint256 balance = token.balanceOf(this);
    token.safeTransfer(owner, balance);
  }

}
contract HasNoTokens is CanReclaimToken {

 /**
  * @dev Reject all ERC223 compatible tokens
  * @param from_ address The address that is transferring the tokens
  * @param value_ uint256 the amount of the specified token
  * @param data_ Bytes The data passed from the caller.
  */
  function tokenFallback(address from_, uint256 value_, bytes data_) external {
    from_;
    value_;
    data_;
    revert();
  }

}

contract GemsToken is HasNoContracts, HasNoEther, HasNoTokens, StandardToken {
    string public constant name = "Gems Token";
    string public constant symbol = "GEM";
    uint8 public constant decimals = 18;
    uint public constant TOTAL_SUPPLY = (8*10**9)*10**uint(decimals);

    function GemsToken() public {
        totalSupply_ = TOTAL_SUPPLY;
        balances[msg.sender] = totalSupply_;
    }
}

Contract Security Audit

Contract ABI

API
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Swarm Source

bzzr://c8c9dca1dc5eaec1ae85db8252d8a2855ea84dc489d9cbc5a0e8a76ea478580d

Block Uncle Number Difficulty Gas Used Reward
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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.