ETH Price: $3,313.97 (+3.60%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

726,258 ( -0.018%)

Market

Price

$21.38 @ 0.006451 ETH (+3.74%)

Onchain Market Cap

$21,380,000,000.00

Circulating Supply Market Cap

$13,494,179,262.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
0.231084627891957461 LINK

Value
$4.94 ( ~0.00149065744477299 Eth) [0.0000%]
0xcc8d945c88bf982eb31a57a13caabcaa15d49e65
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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 19336.36% |ETH 0.0003846 1577.33%

Market

Volume (24H):$990,499,588.00
Market Capitalization:$13,494,179,262.00
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
Binance
LINK-USDT$21.45
0.0064865 Eth
$154,898,178.00
7,247,685.420 LINK
26.8943%
2
Coinbase Exchange
LINK-USD$21.41
0.0064759 Eth
$52,485,450.00
2,451,216.620 LINK
9.0958%
3
Bybit
LINK-USDT$21.48
0.0064942 Eth
$25,815,758.00
1,214,056.307 LINK
4.5050%
4
Slex
LINK-USDT$21.44
0.0064767 Eth
$21,843,022.00
1,019,986.170 LINK
3.7849%
5
DigiFinex
LINK-USDT$21.47
0.0064933 Eth
$18,936,579.00
881,926.360 LINK
3.2726%
6
Gate.io
LINK-USDT$21.44
0.0064882 Eth
$17,070,740.00
798,779.736 LINK
2.9641%
7
KuCoin
LINK-USDT$21.49
0.0064988 Eth
$16,693,785.00
776,811.609 LINK
2.8825%
8
OKX
LINK-USDT$21.48
0.0064956 Eth
$16,574,147.00
774,473.180 LINK
2.8739%
9
XT.COM
LINK-USDT$21.46
0.0064882 Eth
$15,452,649.00
723,216.730 LINK
2.6837%
10
FameEX
LINK-USDT$21.44
0.0064865 Eth
$15,434,330.00
722,501.242 LINK
2.6810%
11
Azbit
LINK-USDT$21.41
0.0064789 Eth
$15,123,114.00
707,516.800 LINK
2.6254%
12
HTX
LINK-USDT$21.45
0.0064857 Eth
$13,441,965.00
626,099.509 LINK
2.3233%
13
Coinstore
LINK-USDT$21.46
0.0064795 Eth
$13,183,848.00
616,929.210 LINK
2.2893%
14
CoinW
LINK-USDT$21.41
0.0064794 Eth
$11,767,214.00
549,583.460 LINK
2.0394%
15
Bitunix
LINK-USDT$21.41
0.0064788 Eth
$11,457,783.00
535,056.650 LINK
1.9855%
16
MEXC
LINK-USDT$21.39
0.0064693 Eth
$11,429,615.00
534,451.430 LINK
1.9832%
17
Binance
LINK-FDUSD$21.41
0.0064737 Eth
$8,750,997.00
409,812.950 LINK
1.5207%
18
BYDFi
LINK-USDT$21.42
0.0064833 Eth
$8,720,790.00
407,054.260 LINK
1.5105%
19
LBank
LINK-USDT$21.44
0.0064880 Eth
$7,582,114.00
353,629.930 LINK
1.3122%
20
LATOKEN
LINK-USDT$21.43
0.0064842 Eth
$7,579,203.00
353,663.188 LINK
1.3124%
21
Hotcoin
LINK-USDT$21.45
0.0064912 Eth
$7,406,072.00
345,210.720 LINK
1.2810%
22
QMall
LINK-USDT$21.41
0.0064765 Eth
$6,241,647.00
291,943.586 LINK
1.0833%
23
BTSE
LINK-USDT$21.41
0.0064758 Eth
$5,250,171.00
245,200.582 LINK
0.9099%
24
Kraken
LINK-USD$21.44
0.0064841 Eth
$4,990,523.00
232,749.142 LINK
0.8637%
25
Dex-Trade
LINK-USDT$21.43
0.0064850 Eth
$4,788,739.00
223,451.040 LINK
0.8292%
26
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$21.43
0.0064856 Eth
$3,853,309.00
183,530.808 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.6810%
27
Bitvavo
LINK-EUR$21.43
0.0064808 Eth
$3,238,652.00
151,123.527 LINK
0.5608%
28
CoinEx
LINK-USDT$21.44
0.0064864 Eth
$3,198,555.00
149,608.129 LINK
0.5552%
29
FMCPAY
LINK-USDT$21.44
0.0064866 Eth
$3,152,514.00
147,287.447 LINK
0.5465%
30
Coinbase Exchange
LINK-EUR$21.44
0.0064855 Eth
$2,910,816.00
135,734.600 LINK
0.5037%
31
Biconomy.com
LINK-USDT$21.46
0.0064898 Eth
$2,375,589.00
110,925.790 LINK
0.4116%
32
PointPay
LINK-USDT$21.46
0.0064838 Eth
$2,345,281.00
109,579.215 LINK
0.4066%
33
Phemex
LINK-USDT$21.43
0.0064850 Eth
$1,752,216.00
81,755.570 LINK
0.3034%
34
AscendEX (BitMax)
LINK-USDT$21.45
0.0064901 Eth
$1,747,762.00
81,488.700 LINK
0.3024%
35
Coinbase Exchange
LINK-GBP$21.44
0.0064885 Eth
$1,712,345.00
79,858.050 LINK
0.2963%
36
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$21.48
0.0065005 Eth
$1,710,671.00
80,323.191 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.2981%
37
Tokpie
LINK-USDT$21.37
0.0064548 Eth
$1,661,753.00
77,773.525 LINK
0.2886%
38
EXMO
LINK-USDT$21.43
0.0064842 Eth
$1,530,828.00
71,431.952 LINK
0.2651%
39
FMCPAY
LINK-ETH$21.50
0.0064962 Eth
$1,381,768.00
65,207.200 LINK
0.2420%
40
FMCPAY
LINK-BTC$21.43
0.0064843 Eth
$1,293,923.00
60,609.300 LINK
0.2249%
41
BitStorage
LINK-USDT$21.41
0.0064800 Eth
$1,246,834.00
58,225.550 LINK
0.2161%
42
Bybit
LINK-USDC$21.40
0.0064711 Eth
$1,106,292.00
51,558.926 LINK
0.1913%
43
BigONE
LINK-USDT$21.51
0.0065093 Eth
$1,088,986.00
50,625.960 LINK
0.1879%
44
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$21.48
0.0065005 Eth
$1,080,165.00
50,992.177 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1892%
45
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$21.44
0.0064854 Eth
$1,049,922.00
74,408.249 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.2761%
46
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$21.49
0.0065006 Eth
$946,577.00
44,634.126 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1656%
47
Gemini
LINK-USD$21.42
0.0064762 Eth
$879,785.00
41,082.009 LINK
0.1524%
48
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$21.43
0.0064856 Eth
$833,266.00
38,767.936 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.1439%
49
Trubit
LINK-USDT$21.47
0.0064868 Eth
$816,125.00
38,151.890 LINK
0.1416%
50
EarnBIT
LINK-USDT$21.51
0.0064964 Eth
$796,925.00
37,117.445 LINK
0.1377%
51
Bitbank
LINK-JPY$21.48
0.0064987 Eth
$771,074.00
35,901.416 LINK
0.1332%
52
Binance
LINK-EUR$21.39
0.0064707 Eth
$767,890.00
36,068.010 LINK
0.1338%
53
tanX
LINK-USDC$21.47
0.0064904 Eth
$723,381.00
33,758.390 LINK
0.1253%
54
Binance
LINK-TRY$21.51
0.0064973 Eth
$666,669.00
31,228.170 LINK
0.1159%
55
itBit
LINK-USD$21.43
0.0064843 Eth
$654,359.00
30,534.723 LINK
0.1133%
56
Coinbase Exchange
LINK-USDT$21.42
0.0064762 Eth
$644,885.00
30,112.923 LINK
0.1117%
57
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$21.43
0.0064799 Eth
$641,570.00
30,378.746 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.1127%
58
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$21.45
0.0064864 Eth
$576,159.00
570,771.180 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
2.1180%
59
GMO Japan
LINK-JPY$21.47
0.0064972 Eth
$571,423.00
26,613.600 LINK
0.0988%
60
QMall
LINK-USDC$21.47
0.0064851 Eth
$570,263.00
26,701.309 LINK
0.0991%
61
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$21.49
0.0065014 Eth
$552,105.00
546,612.699 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
2.0283%
62
LATOKEN
LINK-BTC$21.48
0.0064889 Eth
$508,531.00
23,676.312 LINK
0.0879%
63
Bitkub
LINK-THB$21.35
0.0064569 Eth
$449,337.00
21,046.914 LINK
0.0781%
64
Coinbase Exchange
LINK-BTC$21.43
0.0064776 Eth
$438,903.00
20,481.150 LINK
0.0760%
65
Upbit
LINK-BTC$21.39
0.0064689 Eth
$410,631.00
19,196.219 LINK
0.0712%
66
HashKey Exchange
LINK-USD$21.39
0.0064756 Eth
$392,098.00
18,304.362 LINK
0.0679%
67
Coinbase Exchange
LINK-ETH$21.45
0.0064900 Eth
$374,464.00
17,459.640 LINK
0.0648%
68
Bitso
LINK-USD$21.36
0.0064627 Eth
$314,373.00
14,718.249 LINK
0.0546%
69
bitcastle
LINK-USDT$21.49
0.0064884 Eth
$289,220.00
13,520.760 LINK
0.0502%
70
BitMart
LINK-BTC$21.46
0.0064920 Eth
$277,196.00
12,919.620 LINK
0.0479%
71
Hotcoin
LINK-BTC$21.43
0.0064837 Eth
$270,083.00
12,603.610 LINK
0.0468%
72
OKX
LINK-USDC$21.46
0.0064903 Eth
$264,291.00
12,347.252 LINK
0.0458%
73
BitDelta
LINK-USDT$21.46
0.0064838 Eth
$256,665.00
12,014.000 LINK
0.0446%
74
BYDFi
LINK-USDC$21.41
0.0064656 Eth
$243,843.00
11,389.130 LINK
0.0423%
75
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$21.46
0.0064928 Eth
$221,812.00
10,467.666 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0388%
76
Slex
LINK-ETH$21.50
0.0064927 Eth
$215,810.00
10,182.580 LINK
0.0378%
77
BitStorage
LINK-ETH$21.45
0.0064852 Eth
$207,966.00
9,693.230 LINK
0.0360%
78
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$21.33
0.0064493 Eth
$191,736.00
9,123.622 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0339%
79
Binance US
LINK-USDT$21.39
0.0064686 Eth
$188,679.00
8,821.314 LINK
0.0327%
80
Foxbit
LINK-BRL$21.41
0.0064796 Eth
$186,801.00
8,742.451 LINK
0.0324%
81
Mercado Bitcoin
LINK-BRL$21.36
0.0064634 Eth
$178,260.00
8,345.751 LINK
0.0310%
82
PointPay
LINK-BTC$21.42
0.0064818 Eth
$177,999.00
8,309.445 LINK
0.0308%
83
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$21.48
0.0065005 Eth
$174,563.00
8,216.555 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0305%
84
DeGate
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$21.38
0.0064705 Eth
$165,805.00
7,770.488 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0288%
85
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$21.44
0.0064854 Eth
$161,418.00
7,580.785 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0281%
86
KuCoin
LINK-USDC$21.48
0.0064970 Eth
$121,257.00
5,644.016 LINK
0.0209%
87
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$21.33
0.0064559 Eth
$107,087.00
5,002.657 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0186%
88
Hotcoin
LINK-ETH$21.41
0.0064766 Eth
$98,042.00
4,580.190 LINK
0.0170%
89
BitMart
LINK-ETH$21.44
0.0064878 Eth
$94,654.00
4,414.540 LINK
0.0164%
90
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$21.44
0.0064846 Eth
$87,318.00
87,264.273 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.3238%
91
Kraken
LINK-GBP$21.44
0.0064836 Eth
$85,262.00
3,976.788 LINK
0.0148%
92
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$21.49
0.0065022 Eth
$80,359.00
3,765.441 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0140%
93
KuCoin
LINK-BTC$21.48
0.0064952 Eth
$62,592.00
2,914.212 LINK
0.0108%
94
Coins.ph
LINK-PHP$21.53
0.0065074 Eth
$45,722.00
2,129.973 LINK
0.0079%
95
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$21.47
0.0064979 Eth
$42,078.00
1,980.032 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0073%
96
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$21.50
0.0064926 Eth
$40,147.00
1,900.180 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0071%
97
THENA FUSION
0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$21.39
0.0064733 Eth
$37,718.00
48.666 0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827
0.0002%
98
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$21.44
0.0064877 Eth
$37,230.00
2,621.487 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.0097%
99
Dex-Trade
LINK-ETH$21.36
0.0064644 Eth
$29,072.00
1,360.870 LINK
0.0050%
100
Bybit
LINK-EUR$21.35
0.0064559 Eth
$16,967.84
799.390 LINK
0.0030%

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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