ETH Price: $3,327.62 (-4.31%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

727,699 ( 0.042%)

Market

Price

$22.66 @ 0.006810 ETH (-7.39%)

Onchain Market Cap

$22,660,000,000.00

Circulating Supply Market Cap

$14,302,105,857.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
118.364921 LINK

Value
$2,682.15 ( ~0.806026367067278 Eth) [0.0000%]
0x5503c76517caf0893c8d6ad7b0b11d407debb57c
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OVERVIEW

A blockchain-based middleware, acting as a bridge between cryptocurrency smart contracts, data feeds, APIs and traditional bank account payments.

Profitability / Loss

Since Initial Offer Price
:$0.11 20500% |ETH 0.0003846 1670.67%

Market

Volume (24H):$976,850,293.00
Market Capitalization:$14,302,105,857.00
Circulating Supply:631,099,972.00 LINK
Market Data Source: Coinmarketcap

ICO Information

ICO Start Date : Sep 19, 2017   
Total Cap : $32,000,000
ICO Price  : $0.11 | 0.0003846 ETH
Country : USA

# Exchange Pair Price  24H Volume % Volume
1
Coinbase Exchange
LINK-USD$22.70
0.0068260 Eth
$36,880,291.00
1,624,682.440 LINK
9.9956%
2
MEXC
LINK-USDT$22.71
0.0068265 Eth
$29,325,775.00
1,291,248.170 LINK
7.9442%
3
Bybit
LINK-USDT$22.71
0.0068235 Eth
$28,653,831.00
1,215,710.563 LINK
7.4795%
4
Slex
LINK-USDT$22.72
0.0068389 Eth
$23,840,068.00
1,012,732.020 LINK
6.2307%
5
CoinW
LINK-USDT$22.69
0.0068238 Eth
$21,098,612.00
929,835.220 LINK
5.7207%
6
P2B
LINK-USDT$22.70
0.0068240 Eth
$20,365,099.00
897,235.320 LINK
5.5201%
7
OKX
LINK-USDT$22.72
0.0068274 Eth
$18,007,936.00
768,097.703 LINK
4.7256%
8
DigiFinex
LINK-USDT$22.72
0.0068265 Eth
$13,087,425.00
576,134.910 LINK
3.5446%
9
HTX
LINK-USDT$22.71
0.0068256 Eth
$11,319,309.00
482,105.642 LINK
2.9661%
10
FameEX
LINK-USDT$22.71
0.0068156 Eth
$10,222,246.00
436,379.891 LINK
2.6848%
11
Azbit
LINK-USDT$22.70
0.0068235 Eth
$10,187,045.00
434,850.657 LINK
2.6754%
12
XT.COM
LINK-USDT$22.71
0.0068265 Eth
$10,184,756.00
434,671.010 LINK
2.6742%
13
Coinstore
LINK-USDT$22.67
0.0068139 Eth
$8,950,811.00
381,936.130 LINK
2.3498%
14
Binance
LINK-FDUSD$22.71
0.0068357 Eth
$8,116,790.00
344,474.070 LINK
2.1193%
15
Bitunix
LINK-USDT$22.71
0.0068250 Eth
$8,102,395.00
356,914.950 LINK
2.1959%
16
BTSE
LINK-USDT$22.76
0.0068263 Eth
$7,940,909.00
348,881.311 LINK
2.1464%
17
Biconomy.com
LINK-USDT$22.78
0.0068436 Eth
$6,965,452.00
295,980.334 LINK
1.8210%
18
Kraken
LINK-USD$22.70
0.0068225 Eth
$6,802,337.00
299,690.556 LINK
1.8438%
19
BYDFi
LINK-USDT$22.77
0.0068285 Eth
$6,265,002.00
275,163.030 LINK
1.6929%
20
KuCoin
LINK-USDT$22.73
0.0068294 Eth
$5,414,505.00
238,256.814 LINK
1.4658%
21
Hotcoin
LINK-USDT$22.67
0.0068170 Eth
$5,149,744.00
227,180.010 LINK
1.3977%
22
LATOKEN
LINK-USDT$22.70
0.0068174 Eth
$4,978,949.00
219,378.197 LINK
1.3497%
23
LBank
LINK-USDT$22.69
0.0068214 Eth
$4,562,131.00
201,063.560 LINK
1.2370%
24
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$22.79
0.0068521 Eth
$4,346,687.00
187,428.316 0X514910771AF9CA656AF840DFF83E8264ECF986CA
1.1531%
25
Dex-Trade
LINK-USDT$22.82
0.0068579 Eth
$3,260,956.00
142,875.460 LINK
0.8790%
26
Coinbase Exchange
LINK-GBP$22.69
0.0068198 Eth
$2,622,070.00
115,566.870 LINK
0.7110%
27
Bitvavo
LINK-EUR$22.67
0.0068217 Eth
$2,444,814.00
107,861.143 LINK
0.6636%
28
Dcoin
LINK-USDT$22.72
0.0068304 Eth
$2,394,602.00
105,399.000 LINK
0.6485%
29
ProBit Global
LINK-USDT$22.71
0.0068271 Eth
$2,313,357.00
101,874.293 LINK
0.6268%
30
CoinEx
LINK-USDT$22.65
0.0068158 Eth
$2,153,774.00
92,315.076 LINK
0.5680%
31
PointPay
LINK-USDT$22.70
0.0068279 Eth
$1,672,798.00
71,503.038 LINK
0.4399%
32
Bitbank
LINK-JPY$22.78
0.0068447 Eth
$1,521,187.00
66,787.633 LINK
0.4109%
33
EXMO
LINK-USDT$22.73
0.0068343 Eth
$1,427,997.00
62,818.967 LINK
0.3865%
34
Bitstamp
LINK-USD$22.65
0.0068081 Eth
$1,367,579.00
60,378.748 LINK
0.3715%
35
WhiteBIT
LINK-BTC$22.69
0.0068243 Eth
$1,252,825.00
55,224.740 LINK
0.3398%
36
Phemex
LINK-USDT$22.69
0.0068227 Eth
$1,223,088.00
53,906.430 LINK
0.3317%
37
WhiteBIT
LINK-TRY$22.89
0.0068797 Eth
$1,216,751.00
53,150.710 LINK
0.3270%
38
Coinbase Exchange
LINK-EUR$22.73
0.0068324 Eth
$1,184,615.00
52,114.740 LINK
0.3206%
39
Bitstamp
LINK-EUR$22.69
0.0068199 Eth
$1,061,737.00
46,794.784 LINK
0.2879%
40
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$22.73
0.0068346 Eth
$979,262.00
42,484.806 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.2614%
41
Trubit
LINK-USDT$22.75
0.0068330 Eth
$958,444.00
40,733.030 LINK
0.2506%
42
Bybit
LINK-USDC$22.79
0.0068481 Eth
$927,902.00
39,750.072 LINK
0.2446%
43
BigONE
LINK-USDT$22.74
0.0068448 Eth
$853,341.00
37,531.310 LINK
0.2309%
44
EarnBIT
LINK-USDT$22.74
0.0068297 Eth
$848,762.00
36,222.368 LINK
0.2229%
45
BitStorage
LINK-USDT$22.70
0.0068232 Eth
$820,104.00
36,120.120 LINK
0.2222%
46
itBit
LINK-USD$22.73
0.0068336 Eth
$801,465.00
35,260.246 LINK
0.2169%
47
ProBit Global
LINK-BTC$22.69
0.0068215 Eth
$663,450.00
29,239.439 LINK
0.1799%
48
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$22.76
0.0068426 Eth
$556,395.00
23,977.806 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.1475%
49
Koinpark
LINK-USDT$22.79
0.0068412 Eth
$511,114.00
22,427.199 LINK
0.1380%
50
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$22.65
0.0068073 Eth
$511,052.00
22,268.481 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1370%
51
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$22.68
0.0068166 Eth
$507,170.00
22,351.144 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1375%
52
Binance
LINK-EUR$22.77
0.0068341 Eth
$473,041.00
20,234.620 LINK
0.1245%
53
HashKey Exchange
LINK-USD$22.81
0.0068439 Eth
$461,280.00
19,810.752 LINK
0.1219%
54
Coinbase Exchange
LINK-USDT$22.72
0.0068389 Eth
$447,300.00
19,684.394 LINK
0.1211%
55
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$22.73
0.0068346 Eth
$444,231.00
18,935.877 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.1165%
56
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$22.66
0.0068120 Eth
$438,037.00
457,629.472 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
2.8155%
57
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$22.94
0.0068977 Eth
$428,525.00
18,507.985 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.1139%
58
Slex
LINK-ETH$22.66
0.0068138 Eth
$409,288.00
17,846.490 LINK
0.1098%
59
GMO Japan
LINK-JPY$22.80
0.0068540 Eth
$382,558.00
16,780.600 LINK
0.1032%
60
BitMart
LINK-BTC$22.70
0.0068258 Eth
$360,369.00
15,872.580 LINK
0.0977%
61
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$22.65
0.0068073 Eth
$294,750.00
306,053.982 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
1.8829%
62
OKX
LINK-USDC$22.66
0.0068090 Eth
$288,741.00
12,295.435 LINK
0.0756%
63
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$22.68
0.0068173 Eth
$287,286.00
12,526.356 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0771%
64
BitDelta
LINK-USDT$22.67
0.0068167 Eth
$270,681.00
11,504.000 LINK
0.0708%
65
LATOKEN
LINK-BTC$22.70
0.0068239 Eth
$266,153.00
11,726.138 LINK
0.0721%
66
Gemini
LINK-USD$22.67
0.0068172 Eth
$265,338.00
11,701.778 LINK
0.0720%
67
Coinbase Exchange
LINK-BTC$22.66
0.0068141 Eth
$259,154.00
11,437.340 LINK
0.0704%
68
Bitci TR
LINK-TRY$23.01
0.0069192 Eth
$239,626.00
10,105.201 LINK
0.0622%
69
DeGate
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$22.73
0.0068323 Eth
$220,564.00
9,351.751 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0575%
70
PointPay
LINK-BTC$22.79
0.0068359 Eth
$202,857.00
8,791.462 LINK
0.0541%
71
Binance
LINK-BNB$22.79
0.0068346 Eth
$186,286.00
8,003.079 LINK
0.0492%
72
Hotcoin
LINK-BTC$22.66
0.0068132 Eth
$180,974.00
7,987.980 LINK
0.0491%
73
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$22.79
0.0068521 Eth
$171,143.00
13,249.641 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.0815%
74
BitStorage
LINK-ETH$22.80
0.0068374 Eth
$170,942.00
7,498.890 LINK
0.0461%
75
BitMart
LINK-ETH$22.68
0.0068196 Eth
$158,455.00
6,985.520 LINK
0.0430%
76
BTCMarkets
LINK-AUD$22.97
0.0069016 Eth
$144,074.00
6,272.242 LINK
0.0386%
77
KuCoin
LINK-USDC$22.65
0.0068056 Eth
$121,051.00
5,345.316 LINK
0.0329%
78
Bitbegin
LINK-USDT$22.71
0.0068311 Eth
$120,520.00
5,143.400 LINK
0.0316%
79
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$22.70
0.0068223 Eth
$119,073.00
5,196.793 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0320%
80
Coinbase Exchange
LINK-ETH$22.73
0.0068321 Eth
$119,046.00
5,238.360 LINK
0.0322%
81
Binance US
LINK-USDT$22.76
0.0068274 Eth
$114,745.00
5,040.684 LINK
0.0310%
82
Kanga
LINK-PLN$22.81
0.0068569 Eth
$105,852.00
0.000 LINK
0.0000%
83
Bitso
LINK-USD$22.69
0.0068036 Eth
$94,187.00
4,151.207 LINK
0.0255%
84
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$22.73
0.0068346 Eth
$80,200.00
83,171.905 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.5117%
85
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$22.65
0.0068073 Eth
$76,201.00
3,242.046 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0199%
86
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$22.64
0.0068052 Eth
$73,913.00
3,260.009 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0201%
87
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$22.63
0.0068024 Eth
$66,219.00
2,882.331 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0177%
88
Hotcoin
LINK-ETH$22.68
0.0068267 Eth
$63,010.00
2,777.870 LINK
0.0171%
89
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$22.65
0.0068084 Eth
$61,131.00
2,533.401 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0156%
90
KuCoin
LINK-BTC$22.67
0.0068128 Eth
$57,988.00
2,557.913 LINK
0.0157%
91
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$22.74
0.0068376 Eth
$43,439.00
1,869.141 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0115%
92
Kanga
LINK-USDT$22.76
0.0068503 Eth
$27,874.00
0.000 LINK
0.0000%
93
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$22.75
0.0068367 Eth
$21,787.00
939.661 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0058%
94
THENA FUSION
0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$22.76
0.0068417 Eth
$18,854.35
25.705 0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827
0.0002%
95
Uniswap V3 (Avalanche)
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$22.94
0.0068967 Eth
$15,813.16
690.689 0X5947BB275C521040051D82396192181B413227A3
0.0042%
96
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$22.78
0.0068483 Eth
$15,511.42
680.822 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0042%
97
Bitstamp
LINK-BTC$22.82
0.0068585 Eth
$10,239.17
448.743 LINK
0.0028%
98
KuCoin
LINK-KCS$22.69
0.0068174 Eth
$10,223.18
450.644 LINK
0.0028%
99
Bitexen
LINK-TRY$22.70
0.0068103 Eth
$8,864.48
390.544 LINK
0.0024%
100
Ace
LINK-USDT$22.71
0.0068274 Eth
$3,841.48
163.760 LINK
0.0010%

Contract Source Code Verified (Exact Match)

Contract Name:
LinkToken

Compiler Version
v0.4.16+commit.d7661dd9

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, Audited

Contract Source Code (Solidity)Audit Report

/**
 *Submitted for verification at Etherscan.io on 2017-09-23
*/

pragma solidity ^0.4.16;


/**
 * @title SafeMath
 * @dev Math operations with safety checks that throw on error
 */
library SafeMath {
  function mul(uint256 a, uint256 b) internal constant returns (uint256) {
    uint256 c = a * b;
    assert(a == 0 || c / a == b);
    return c;
  }

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

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


/**
 * @title ERC20Basic
 * @dev Simpler version of ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/179
 */
contract ERC20Basic {
  uint256 public totalSupply;
  function balanceOf(address who) constant returns (uint256);
  function transfer(address to, uint256 value) returns (bool);
  event Transfer(address indexed from, address indexed to, uint256 value);
}
/**
 * @title ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/20
 */
contract ERC20 is ERC20Basic {
  function allowance(address owner, address spender) constant returns (uint256);
  function transferFrom(address from, address to, uint256 value) returns (bool);
  function approve(address spender, uint256 value) returns (bool);
  event Approval(address indexed owner, address indexed spender, uint256 value);
}

contract ERC677 is ERC20 {
  function transferAndCall(address to, uint value, bytes data) returns (bool success);

  event Transfer(address indexed from, address indexed to, uint value, bytes data);
}

contract ERC677Receiver {
  function onTokenTransfer(address _sender, uint _value, bytes _data);
}

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

  mapping(address => uint256) balances;

  /**
  * @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) returns (bool) {
    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) constant returns (uint256 balance) {
    return balances[_owner];
  }

}


/**
 * @title Standard ERC20 token
 *
 * @dev Implementation of the basic standard token.
 * @dev https://github.com/ethereum/EIPs/issues/20
 * @dev Based on code by FirstBlood: https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol
 */
contract StandardToken is ERC20, BasicToken {

  mapping (address => mapping (address => uint256)) 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) returns (bool) {
    var _allowance = allowed[_from][msg.sender];

    // Check is not needed because sub(_allowance, _value) will already throw if this condition is not met
    // require (_value <= _allowance);

    balances[_from] = balances[_from].sub(_value);
    balances[_to] = balances[_to].add(_value);
    allowed[_from][msg.sender] = _allowance.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.
   * @param _spender The address which will spend the funds.
   * @param _value The amount of tokens to be spent.
   */
  function approve(address _spender, uint256 _value) 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) constant returns (uint256 remaining) {
    return allowed[_owner][_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
   */
  function increaseApproval (address _spender, uint _addedValue) 
    returns (bool success) {
    allowed[msg.sender][_spender] = allowed[msg.sender][_spender].add(_addedValue);
    Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
    return true;
  }

  function decreaseApproval (address _spender, uint _subtractedValue) 
    returns (bool success) {
    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 ERC677Token is ERC677 {

  /**
  * @dev transfer token to a contract address with additional data if the recipient is a contact.
  * @param _to The address to transfer to.
  * @param _value The amount to be transferred.
  * @param _data The extra data to be passed to the receiving contract.
  */
  function transferAndCall(address _to, uint _value, bytes _data)
    public
    returns (bool success)
  {
    super.transfer(_to, _value);
    Transfer(msg.sender, _to, _value, _data);
    if (isContract(_to)) {
      contractFallback(_to, _value, _data);
    }
    return true;
  }


  // PRIVATE

  function contractFallback(address _to, uint _value, bytes _data)
    private
  {
    ERC677Receiver receiver = ERC677Receiver(_to);
    receiver.onTokenTransfer(msg.sender, _value, _data);
  }

  function isContract(address _addr)
    private
    returns (bool hasCode)
  {
    uint length;
    assembly { length := extcodesize(_addr) }
    return length > 0;
  }

}

contract LinkToken is StandardToken, ERC677Token {

  uint public constant totalSupply = 10**27;
  string public constant name = 'ChainLink Token';
  uint8 public constant decimals = 18;
  string public constant symbol = 'LINK';

  function LinkToken()
    public
  {
    balances[msg.sender] = totalSupply;
  }

  /**
  * @dev transfer token to a specified address with additional data if the recipient is a contract.
  * @param _to The address to transfer to.
  * @param _value The amount to be transferred.
  * @param _data The extra data to be passed to the receiving contract.
  */
  function transferAndCall(address _to, uint _value, bytes _data)
    public
    validRecipient(_to)
    returns (bool success)
  {
    return super.transferAndCall(_to, _value, _data);
  }

  /**
  * @dev transfer token to a specified address.
  * @param _to The address to transfer to.
  * @param _value The amount to be transferred.
  */
  function transfer(address _to, uint _value)
    public
    validRecipient(_to)
    returns (bool success)
  {
    return super.transfer(_to, _value);
  }

  /**
   * @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
   * @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
    validRecipient(_spender)
    returns (bool)
  {
    return super.approve(_spender,  _value);
  }

  /**
   * @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
    validRecipient(_to)
    returns (bool)
  {
    return super.transferFrom(_from, _to, _value);
  }


  // MODIFIERS

  modifier validRecipient(address _recipient) {
    require(_recipient != address(0) && _recipient != address(this));
    _;
  }

}

Contract Security Audit

Contract ABI

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Deployed Bytecode

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Swarm Source

bzzr://c5f438ff94e5ddaf2058efa0019e246c636c37a622e04bb67827c7374acad8d6
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