English
USD
Popular
Other
XERA
XERA
ICO
Dynamizing Cryptocurrency Trading
Category: Platform, Cryptocurrency, Investment
Founded: Nov 5, 2018
Country: United Kingdom
Registered on Neironix

Information about ICO

Platform Ethereum
Accepted BTC, ETH
Start date Nov 5, 2018
End date Dec 31, 2018
Token price 1 XERA =
Released tokens 95 000 000
Soft cap
Hard cap
Raised
Minimal amount 0 XERA
Token XERA - 0.5000000000$
Periods
05.11.2018 31.12.2018
100.00%
XERA (XERA)
XERA (XERA)
Token
Ethereum
Application
ERC-20
Platform: Ethereum
trade -
XERA - token distribution
XERA - use of funds
Smart contract - XERA
pragma solidity ^0.4.24;

/*
 * Creator: XERA
 */

/*
 * Abstract Token Smart Contract
 *
 */

 
 /*
 * Safe Math Smart Contract. 
 * https://github.com/OpenZeppelin/zeppelin-solidity/blob/master/contracts/math/SafeMath.sol
 */

contract SafeMath {
  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;
  }

  function safeDiv(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;
  }

  function safeSub(uint256 a, uint256 b) internal pure returns (uint256) {
    assert(b <= a);
    return a - b;
  }

  function safeAdd(uint256 a, uint256 b) internal pure returns (uint256) {
    uint256 c = a + b;
    assert(c >= a);
    return c;
  }
}




/**
 * ERC-20 standard token interface, as defined
 * <a href="http://github.com/ethereum/EIPs/issues/20">here</a>.
 */
contract Token {
  
  function totalSupply() constant returns (uint256 supply);
  function balanceOf(address _owner) constant returns (uint256 balance);
  function transfer(address _to, uint256 _value) returns (bool success);
  function transferFrom(address _from, address _to, uint256 _value) returns (bool success);
  function approve(address _spender, uint256 _value) returns (bool success);
  function allowance(address _owner, address _spender) constant returns (uint256 remaining);
  event Transfer(address indexed _from, address indexed _to, uint256 _value);
  event Approval(address indexed _owner, address indexed _spender, uint256 _value);
}



/**
 * Abstract Token Smart Contract that could be used as a base contract for
 * ERC-20 token contracts.
 */
contract AbstractToken is Token, SafeMath {
  /**
   * Create new Abstract Token contract.
   */
  function AbstractToken () {
    // Do nothing
  }
  
  /**
   * Get number of tokens currently belonging to given owner.
   *
   * @param _owner address to get number of tokens currently belonging to the
   *        owner of
   * @return number of tokens currently belonging to the owner of given address
   */
  function balanceOf(address _owner) constant returns (uint256 balance) {
    return accounts [_owner];
  }

  /**
   * Transfer given number of tokens from message sender to given recipient.
   *
   * @param _to address to transfer tokens to the owner of
   * @param _value number of tokens to transfer to the owner of given address
   * @return true if tokens were transferred successfully, false otherwise
   * accounts [_to] + _value > accounts [_to] for overflow check
   * which is already in safeMath
   */
  function transfer(address _to, uint256 _value) returns (bool success) {
    require(_to != address(0));
    if (accounts [msg.sender] < _value) return false;
    if (_value > 0 && msg.sender != _to) {
      accounts [msg.sender] = safeSub (accounts [msg.sender], _value);
      accounts [_to] = safeAdd (accounts [_to], _value);
    }
    emit Transfer (msg.sender, _to, _value);
    return true;
  }

  /**
   * Transfer given number of tokens from given owner to given recipient.
   *
   * @param _from address to transfer tokens from the owner of
   * @param _to address to transfer tokens to the owner of
   * @param _value number of tokens to transfer from given owner to given
   *        recipient
   * @return true if tokens were transferred successfully, false otherwise
   * accounts [_to] + _value > accounts [_to] for overflow check
   * which is already in safeMath
   */
  function transferFrom(address _from, address _to, uint256 _value)
  returns (bool success) {
    require(_to != address(0));
    if (allowances [_from][msg.sender] < _value) return false;
    if (accounts [_from] < _value) return false; 

    if (_value > 0 && _from != _to) {
	  allowances [_from][msg.sender] = safeSub (allowances [_from][msg.sender], _value);
      accounts [_from] = safeSub (accounts [_from], _value);
      accounts [_to] = safeAdd (accounts [_to], _value);
    }
    emit Transfer(_from, _to, _value);
    return true;
  }

  /**
   * Allow given spender to transfer given number of tokens from message sender.
   * @param _spender address to allow the owner of to transfer tokens from message sender
   * @param _value number of tokens to allow to transfer
   * @return true if token transfer was successfully approved, false otherwise
   */
   function approve (address _spender, uint256 _value) returns (bool success) {
    allowances [msg.sender][_spender] = _value;
    emit Approval (msg.sender, _spender, _value);
    return true;
  }

  /**
   * Tell how many tokens given spender is currently allowed to transfer from
   * given owner.
   *
   * @param _owner address to get number of tokens allowed to be transferred
   *        from the owner of
   * @param _spender address to get number of tokens allowed to be transferred
   *        by the owner of
   * @return number of tokens given spender is currently allowed to transfer
   *         from given owner
   */
  function allowance(address _owner, address _spender) constant
  returns (uint256 remaining) {
    return allowances [_owner][_spender];
  }

  /**
   * Mapping from addresses of token holders to the numbers of tokens belonging
   * to these token holders.
   */
  mapping (address => uint256) accounts;

  /**
   * Mapping from addresses of token holders to the mapping of addresses of
   * spenders to the allowances set by these token holders to these spenders.
   */
  mapping (address => mapping (address => uint256)) private allowances;
  
}


/**
 * XERA Token Smart Contract.
 */
contract XERA is AbstractToken {
  /**
   * Maximum allowed number of tokens in circulation.
   * tokenSupply = tokensIActuallyWant * (10 ^ decimals)
   */
   
   
  uint256 constant MAX_TOKEN_COUNT = 95000000 * (10**18);
   
  /**
   * Address of the owner of this smart contract.
   */
  address private owner;
  
  /**
   * Frozen account list holder
   */
  mapping (address => bool) private frozenAccount;
  
  /**
   * Burning account list holder
   */
  
  mapping (address => bool) private burningAccount;
  

  /**
   * Current number of tokens in circulation.
   */
  uint256 tokenCount = 0;
  
 
  /**
   * True if tokens transfers are currently frozen, false otherwise.
   */
  bool frozen = false;
  
 
  /**
   * Create new token smart contract and make msg.sender the
   * owner of this smart contract.
   */
  function XERA () {
    owner = msg.sender;
  }

  /**
   * Get total number of tokens in circulation.
   *
   * @return total number of tokens in circulation
   */
  function totalSupply() constant returns (uint256 supply) {
    return tokenCount;
  }

  string constant public name = "XERA";
  string constant public symbol = "XERA";
  uint8 constant public decimals = 18;
  
  /**
   * Transfer given number of tokens from message sender to given recipient.
   * @param _to address to transfer tokens to the owner of
   * @param _value number of tokens to transfer to the owner of given address
   * @return true if tokens were transferred successfully, false otherwise
   */
  function transfer(address _to, uint256 _value) returns (bool success) {
    require(!frozenAccount[msg.sender]);
	if (frozen) return false;
    else return AbstractToken.transfer (_to, _value);
  }

  /**
   * Transfer given number of tokens from given owner to given recipient.
   *
   * @param _from address to transfer tokens from the owner of
   * @param _to address to transfer tokens to the owner of
   * @param _value number of tokens to transfer from given owner to given
   *        recipient
   * @return true if tokens were transferred successfully, false otherwise
   */
  function transferFrom(address _from, address _to, uint256 _value)
    returns (bool success) {
	require(!frozenAccount[_from]);
    if (frozen) return false;
    else return AbstractToken.transferFrom (_from, _to, _value);
  }

   /**
   * Change how many tokens given spender is allowed to transfer from message
   * spender.  In order to prevent double spending of allowance,
   * To change the approve amount you first have to reduce the addresses`
   * allowance to zero by calling `approve(_spender, 0)` if it is not
   * already 0 to mitigate the race condition described here:
   * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
   * @param _spender address to allow the owner of to transfer tokens from
   *        message sender
   * @param _value number of tokens to allow to transfer
   * @return true if token transfer was successfully approved, false otherwise
   */
  function approve (address _spender, uint256 _value)
    returns (bool success) {
	require(allowance (msg.sender, _spender) == 0 || _value == 0);
    return AbstractToken.approve (_spender, _value);
  }

  /**
   * Create _value new tokens and give new created tokens to msg.sender.
   * Only be called by smart contract owner.
   *
   * @param _value number of tokens to create
   * @return true if tokens were created successfully, false otherwise
   */
  function createTokens(uint256 _value)
    returns (bool success) {
    require (msg.sender == owner);

    if (_value > 0) {
      if (_value > safeSub (MAX_TOKEN_COUNT, tokenCount)) return false;
	  
      accounts [msg.sender] = safeAdd (accounts [msg.sender], _value);
      tokenCount = safeAdd (tokenCount, _value);
	  
	  // adding transfer event and _from address as null address
	  emit Transfer(0x0, msg.sender, _value);
	  
	  return true;
    }
	
	  return false;
    
  }
  
  
 /**
   * Burning capable account
   * Only be called by smart contract owner.
   */
  function burningCapableAccount(address[] _target) {
  
      require (msg.sender == owner);
	  
	  for (uint i = 0; i < _target.length; i++) {
			burningAccount[_target[i]] = true;
        }
 }
  
  /**
   * Burn intended tokens.
   * Only be called by by burnable addresses.
   *
   * @param _value number of tokens to burn
   * @return true if burnt successfully, false otherwise
   */
  
  function burn(uint256 _value) public returns (bool success) {
  
        require(accounts[msg.sender] >= _value); 
		
		require(burningAccount[msg.sender]);
		
		accounts [msg.sender] = safeSub (accounts [msg.sender], _value);
		
        tokenCount = safeSub (tokenCount, _value);	
		
        emit Burn(msg.sender, _value);
		
        return true;
    }
  

  /**
   * Set new owner for the smart contract.
   * Only be called by smart contract owner.
   *
   * @param _newOwner address of new owner of the smart contract
   */
  function setOwner(address _newOwner) {
    require (msg.sender == owner);

    owner = _newOwner;
  }

  /**
   * Freeze ALL token transfers.
   * Only be called by smart contract owner.
   */
  function freezeTransfers () {
    require (msg.sender == owner);

    if (!frozen) {
      frozen = true;
      emit Freeze ();
    }
  }

  /**
   * Unfreeze ALL token transfers.
   * Only be called by smart contract owner.
   */
  function unfreezeTransfers () {
    require (msg.sender == owner);

    if (frozen) {
      frozen = false;
      emit Unfreeze ();
    }
  }
  
  
  /*A user is able to unintentionally send tokens to a contract 
  * and if the contract is not prepared to refund them they will get stuck in the contract. 
  * The same issue used to happen for Ether too but new Solidity versions added the payable modifier to
  * prevent unintended Ether transfers. However, there’s no such mechanism for token transfers.
  * so the below function is created
  */
  
  function refundTokens(address _token, address _refund, uint256 _value) {
    require (msg.sender == owner);
    require(_token != address(this));
    AbstractToken token = AbstractToken(_token);
    token.transfer(_refund, _value);
    emit RefundTokens(_token, _refund, _value);
  }
  
  /**
   * Freeze specific account
   * Only be called by smart contract owner.
   */
  function freezeAccount(address _target, bool freeze) {
      require (msg.sender == owner);
	  require (msg.sender != _target);
      frozenAccount[_target] = freeze;
      emit FrozenFunds(_target, freeze);
 }

  /**
   * Logged when token transfers were frozen.
   */
  event Freeze ();

  /**
   * Logged when token transfers were unfrozen.
   */
  event Unfreeze ();
  
  /**
   * Logged when a particular account is frozen.
   */
  
  event FrozenFunds(address target, bool frozen);
  
  /**
   * Logged when a token is burnt.
   */  
  
  event Burn(address target,uint256 _value);


  
  /**
   * when accidentally send other tokens are refunded
   */
  
  event RefundTokens(address _token, address _refund, uint256 _value);
}
Bounty program - XERA - Ico - XERA
Platform:
Reward:
Tokens
Start date:
Aug 12, 2018
End date:
Nov 27, 2018
Distribution of tokens : Nov 27, 2018
Available bounties
Following
Signature BT
Review
Translate
Sharing
Bitcoin
(-1.81%)
Ripple
(-1.89%)
Ethereum
(-5.79%)
Bitcoin Cash
(3.69%)
EOS
(-2.00%)
Stellar
(-2.22%)
Tether
(0.02%)
Litecoin
(-3.53%)
Tronix
(-4.78%)
Bitcoin SV
(-2.50%)
Cardano
(0.76%)
IOTA
(-1.90%)
Binance Coin
(-1.54%)
Monero
(-2.24%)
Dash
(-2.39%)
NEM
(-2.12%)
NEO
(-2.83%)
Ethereum Classic
(-2.73%)
ZCash
(-3.29%)
Waves
(-5.15%)
Support Center
Track cryptocurrency has become even more convenient with our application.
Neironix Mobile App
Download for FREE
Download App
Create account
Sign in
Contact technical support
If you have any problems with the system, please describe the problem in the form below, or send your question to: support@neironix.io