Contract Source Code:
File 1 of 1 : OTPPAY
pragma solidity 0.4.19;
/**
* @title SafeMath
* @dev Math operations with safety checks that throw on error
*/
library 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 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;
}
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
assert(b <= a);
return a - b;
}
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
assert(c >= a);
return c;
}
}
contract ERC20 {
function totalSupply()public view returns (uint total_Supply);
function balanceOf(address who)public view returns (uint256);
function allowance(address owner, address spender)public view returns (uint);
function transferFrom(address from, address to, uint value)public returns (bool ok);
function approve(address spender, uint value)public returns (bool ok);
function transfer(address to, uint value)public returns (bool ok);
event Transfer(address indexed from, address indexed to, uint value);
event Approval(address indexed owner, address indexed spender, uint value);
}
contract OTPPAY is ERC20
{ using SafeMath for uint256;
// Name of the token
string public constant name = "OTPPAY";
// Symbol of token
string public constant symbol = "OTP";
uint8 public constant decimals = 18;
uint public _totalsupply = 1000000000 * 10 ** 18; // 1 billion total supply // muliplies dues to decimal precision
address public owner; // Owner of this contract
uint256 public _price_tokn_PRE = 16000; // 1 Ether = 16000 coins
uint256 public _price_tokn_ICO1;
uint256 public _price_tokn_ICO2;
uint256 no_of_tokens;
uint256 bonus_token;
uint256 total_token;
uint256 refferaltoken;
bool stopped = false;
uint256 public pre_startdate;
uint256 public ico1_startdate;
uint256 public ico2_startdate;
uint256 pre_enddate;
uint256 ico1_enddate;
uint256 ico2_enddate;
uint256 maxCap_PRE;
uint256 maxCap_ICO1;
uint256 maxCap_ICO2;
address central_account;
mapping(address => uint) balances;
mapping(address => mapping(address => uint)) allowed;
enum Stages {
NOTSTARTED,
PREICO,
ICO1,
ICO2,
PAUSED,
ENDED
}
Stages public stage;
modifier atStage(Stages _stage) {
if (stage != _stage)
// Contract not in expected state
revert();
_;
}
modifier onlyOwner() {
if (msg.sender != owner) {
revert();
}
_;
}
modifier onlycentralAccount {
require(msg.sender == central_account);
_;
}
function OTPPAY() public
{
owner = msg.sender;
balances[owner] = 319000000 * 10 **18; // 319 million to owner
stage = Stages.NOTSTARTED;
Transfer(0, owner, balances[owner]);
}
function () public payable
{
require(stage != Stages.ENDED);
require(!stopped && msg.sender != owner);
if( stage == Stages.PREICO && now <= pre_enddate )
{
no_of_tokens =((msg.value).mul(_price_tokn_PRE));
bonus_token = ((no_of_tokens).mul(20)).div(100); // 20 percent bonus token
total_token = no_of_tokens + bonus_token;
transferTokens(msg.sender,total_token);
}
else if(stage == Stages.ICO1 && now <= ico1_enddate )
{
no_of_tokens =((msg.value).mul(_price_tokn_ICO1));
bonus_token = ((no_of_tokens).mul(15)).div(100); // 15 percent bonus token
total_token = no_of_tokens + bonus_token;
transferTokens(msg.sender,total_token);
}
else if(stage == Stages.ICO2 && now <= ico2_enddate)
{
no_of_tokens =((msg.value).mul(_price_tokn_ICO2));
bonus_token = ((no_of_tokens).mul(10)).div(100); // 10 percent bonus token
total_token = no_of_tokens + bonus_token;
transferTokens(msg.sender,total_token);
}
else
{
revert();
}
}
function start_PREICO() public onlyOwner atStage(Stages.NOTSTARTED)
{
stage = Stages.PREICO;
stopped = false;
maxCap_PRE = 72000000 * 10 **18; // 60(pre) + 12(bonus) = 72 million
balances[address(this)] = maxCap_PRE;
pre_startdate = now;
pre_enddate = now + 30 days;
Transfer(0, address(this), balances[address(this)]);
}
function start_ICO1(uint256 price_tokn_ico1) public onlyOwner atStage(Stages.PREICO)
{
require(price_tokn_ico1 !=0);
require(now > pre_enddate || balances[address(this)] == 0);
stage = Stages.ICO1;
stopped = false;
_price_tokn_ICO1 = price_tokn_ico1;
maxCap_ICO1 = 345000000 * 10 **18; // 345 million
balances[address(this)] = (balances[address(this)]).add(maxCap_ICO1) ;
ico1_startdate = now;
ico1_enddate = now + 30 days;
Transfer(0, address(this), balances[address(this)]);
}
function start_ICO2(uint256 price_tokn_ico2) public onlyOwner atStage(Stages.ICO1)
{
require(price_tokn_ico2 !=0);
require(now > ico1_enddate || balances[address(this)] == 0);
stage = Stages.ICO2;
stopped = false;
_price_tokn_ICO2 = price_tokn_ico2;
maxCap_ICO2 = 264000000 * 10 **18; // 264 million
balances[address(this)] = (balances[address(this)]).add(maxCap_ICO2) ;
ico2_startdate = now;
ico2_enddate = now + 30 days;
Transfer(0, address(this), balances[address(this)]);
}
// called by the owner, pause ICO
function PauseICO() external onlyOwner
{
stopped = true;
}
// called by the owner , resumes ICO
function ResumeICO() external onlyOwner
{
stopped = false;
}
function end_ICO(uint256 _refferaltoken) external onlyOwner atStage(Stages.ICO2)
{
require(_refferaltoken !=0);
require(now > ico2_enddate || balances[address(this)] == 0);
stage = Stages.ENDED;
refferaltoken = _refferaltoken;
balances[address(this)] = (balances[address(this)]).sub(refferaltoken * 10 **18);
balances[owner] = (balances[owner]).add(refferaltoken * 10 **18);
_totalsupply = (_totalsupply).sub(balances[address(this)]);
balances[address(this)] = 0;
Transfer(address(this), 0 , balances[address(this)]);
Transfer(address(this), owner, refferaltoken);
}
function set_centralAccount(address central_Acccount) external onlyOwner
{
central_account = central_Acccount;
}
// what is the total supply of the ech tokens
function totalSupply() public view returns (uint256 total_Supply) {
total_Supply = _totalsupply;
}
// What is the balance of a particular account?
function balanceOf(address _owner)public view returns (uint256 balance) {
return balances[_owner];
}
// Send _value amount of tokens from address _from to address _to
// The transferFrom method is used for a withdraw workflow, allowing contracts to send
// tokens on your behalf, for example to "deposit" to a contract address and/or to charge
// fees in sub-currencies; the command should fail unless the _from account has
// deliberately authorized the sender of the message via some mechanism; we propose
// these standardized APIs for approval:
function transferFrom( address _from, address _to, uint256 _amount )public returns (bool success) {
require( _to != 0x0);
require(balances[_from] >= _amount && allowed[_from][msg.sender] >= _amount && _amount >= 0);
balances[_from] = (balances[_from]).sub(_amount);
allowed[_from][msg.sender] = (allowed[_from][msg.sender]).sub(_amount);
balances[_to] = (balances[_to]).add(_amount);
Transfer(_from, _to, _amount);
return true;
}
// Allow _spender to withdraw from your account, multiple times, up to the _value amount.
// If this function is called again it overwrites the current allowance with _value.
function approve(address _spender, uint256 _amount)public returns (bool success) {
require( _spender != 0x0);
allowed[msg.sender][_spender] = _amount;
Approval(msg.sender, _spender, _amount);
return true;
}
function allowance(address _owner, address _spender)public view returns (uint256 remaining) {
require( _owner != 0x0 && _spender !=0x0);
return allowed[_owner][_spender];
}
// Transfer the balance from owner's account to another account
function transfer(address _to, uint256 _amount)public returns (bool success) {
require( _to != 0x0);
require(balances[msg.sender] >= _amount && _amount >= 0);
balances[msg.sender] = (balances[msg.sender]).sub(_amount);
balances[_to] = (balances[_to]).add(_amount);
Transfer(msg.sender, _to, _amount);
return true;
}
// Transfer the balance from owner's account to another account
function transferTokens(address _to, uint256 _amount) private returns(bool success) {
require( _to != 0x0);
require(balances[address(this)] >= _amount && _amount > 0);
balances[address(this)] = (balances[address(this)]).sub(_amount);
balances[_to] = (balances[_to]).add(_amount);
Transfer(address(this), _to, _amount);
return true;
}
function transferby(address _from,address _to,uint256 _amount) external onlycentralAccount returns(bool success) {
require( _to != 0x0);
require (balances[_from] >= _amount && _amount > 0);
balances[_from] = (balances[_from]).sub(_amount);
balances[_to] = (balances[_to]).add(_amount);
Transfer(_from, _to, _amount);
return true;
}
function drain() external onlyOwner {
owner.transfer(this.balance);
}
}