ETH Price: $3,343.14 (-1.63%)
Gas: 3.9 Gwei

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

728,391 ( 0.016%)

Market

Price

$21.25 @ 0.006356 ETH (-9.24%)

Onchain Market Cap

$21,250,000,000.00

Circulating Supply Market Cap

$13,421,139,088.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
0.5 LINK

Value
$10.63 ( ~0.00317964791721974 Eth) [0.0000%]
0x7341e7e0d6e783e3d521ec952b0b3967e7c68e4b
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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 19218.18% |ETH 0.0003846 1552.63%

Market

Volume (24H):$943,411,358.00
Market Capitalization:$13,421,139,088.00
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$21.23
0.0063541 Eth
$103,623,825.00
4,716,100.430 LINK
21.7370%
2
Coinbase Exchange
LINK-USD$21.26
0.0063661 Eth
$43,138,828.00
2,029,489.470 LINK
9.3541%
3
Bybit
LINK-USDT$21.22
0.0063530 Eth
$32,035,810.00
1,468,139.000 LINK
6.7668%
4
WhiteBIT
LINK-USDT$21.25
0.0063639 Eth
$28,189,171.00
1,326,542.080 LINK
6.1142%
5
OKX
LINK-USDT$21.25
0.0063609 Eth
$20,735,721.00
941,131.911 LINK
4.3378%
6
MEXC
LINK-USDT$21.23
0.0063536 Eth
$20,212,977.00
952,285.850 LINK
4.3892%
7
CoinW
LINK-USDT$21.25
0.0063631 Eth
$18,133,680.00
853,509.650 LINK
3.9339%
8
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$21.19
0.0063455 Eth
$14,813,100.00
672,609.780 0X514910771AF9CA656AF840DFF83E8264ECF986CA
3.1001%
9
DigiFinex
LINK-USDT$21.23
0.0063567 Eth
$13,412,196.00
631,631.840 LINK
2.9113%
10
HTX
LINK-USDT$21.23
0.0063561 Eth
$10,493,109.00
477,726.356 LINK
2.2019%
11
FameEX
LINK-USDT$21.24
0.0063575 Eth
$10,351,667.00
471,105.385 LINK
2.1714%
12
Azbit
LINK-USDT$21.26
0.0063655 Eth
$10,323,039.00
469,774.873 LINK
2.1652%
13
XT.COM
LINK-USDT$21.23
0.0063546 Eth
$10,221,013.00
464,668.060 LINK
2.1417%
14
Coinstore
LINK-USDT$21.22
0.0063559 Eth
$9,363,531.00
426,604.970 LINK
1.9663%
15
Bitunix
LINK-USDT$21.19
0.0063485 Eth
$8,308,287.00
391,960.940 LINK
1.8066%
16
Biconomy.com
LINK-USDT$21.23
0.0063546 Eth
$7,070,221.00
321,757.772 LINK
1.4830%
17
BYDFi
LINK-USDT$21.34
0.0063758 Eth
$6,541,608.00
306,471.780 LINK
1.4126%
18
BTSE
LINK-USDT$21.19
0.0063460 Eth
$5,885,580.00
277,782.977 LINK
1.2803%
19
Binance
LINK-FDUSD$21.30
0.0063684 Eth
$5,731,159.00
260,293.530 LINK
1.1997%
20
LATOKEN
LINK-USDT$21.29
0.0063678 Eth
$4,932,880.00
231,653.744 LINK
1.0677%
21
KuCoin
LINK-USDT$21.24
0.0063592 Eth
$4,636,079.00
218,222.690 LINK
1.0058%
22
LBank
LINK-USDT$21.18
0.0063437 Eth
$4,524,686.00
213,671.030 LINK
0.9848%
23
QMall
LINK-USDT$21.26
0.0063632 Eth
$4,194,332.00
191,034.873 LINK
0.8805%
24
Hotcoin
LINK-USDT$21.21
0.0063517 Eth
$3,997,651.00
188,508.670 LINK
0.8689%
25
Binance
LINK-USDC$21.23
0.0063543 Eth
$3,946,776.00
179,860.810 LINK
0.8290%
26
Kraken
LINK-USD$21.25
0.0063610 Eth
$3,681,821.00
173,258.335 LINK
0.7986%
27
Dex-Trade
LINK-USDT$21.30
0.0063696 Eth
$3,368,922.00
158,154.711 LINK
0.7290%
28
Bitvavo
LINK-EUR$21.31
0.0063708 Eth
$3,187,623.00
149,615.448 LINK
0.6896%
29
CoinEx
LINK-USDT$21.19
0.0063486 Eth
$2,410,980.00
110,034.753 LINK
0.5072%
30
Bybit
LINK-USDC$21.24
0.0063581 Eth
$2,210,905.00
102,889.235 LINK
0.4742%
31
Dcoin
LINK-USDT$21.25
0.0063595 Eth
$2,135,470.00
100,513.000 LINK
0.4633%
32
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$21.20
0.0063500 Eth
$2,005,317.00
90,892.007 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.4189%
33
PointPay
LINK-USDT$21.29
0.0063678 Eth
$1,661,113.00
75,666.173 LINK
0.3488%
34
Coinbase Exchange
LINK-ETH$21.24
0.0063581 Eth
$1,552,379.00
73,085.820 LINK
0.3369%
35
Coinbase Exchange
LINK-GBP$21.21
0.0063537 Eth
$1,495,691.00
70,502.030 LINK
0.3250%
36
EXMO
LINK-USDT$21.24
0.0063563 Eth
$1,477,434.00
69,574.844 LINK
0.3207%
37
Coinbase Exchange
LINK-EUR$21.27
0.0063712 Eth
$1,362,960.00
64,069.600 LINK
0.2953%
38
Phemex
LINK-USDT$21.23
0.0063542 Eth
$1,224,572.00
57,693.130 LINK
0.2659%
39
WhiteBIT
LINK-BTC$21.26
0.0063591 Eth
$1,125,030.00
52,907.920 LINK
0.2439%
40
tanX
LINK-USDC$21.25
0.0063629 Eth
$1,049,923.00
47,952.110 LINK
0.2210%
41
Coinbase Exchange
LINK-USDT$21.18
0.0063452 Eth
$1,021,285.00
48,217.236 LINK
0.2222%
42
Kraken
LINK-USDT$21.24
0.0063573 Eth
$973,781.00
45,850.343 LINK
0.2113%
43
EarnBIT
LINK-USDT$21.22
0.0063530 Eth
$957,356.00
43,510.237 LINK
0.2005%
44
WhiteBIT
LINK-TRY$21.37
0.0064001 Eth
$908,163.00
42,495.480 LINK
0.1959%
45
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$21.18
0.0063406 Eth
$831,495.00
37,671.180 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1736%
46
BitStorage
LINK-USDT$21.20
0.0063497 Eth
$803,752.00
37,920.330 LINK
0.1748%
47
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$21.14
0.0063312 Eth
$750,018.00
33,751.819 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.1556%
48
Gemini
LINK-USD$21.28
0.0063702 Eth
$741,903.00
34,865.471 LINK
0.1607%
49
Bitbank
LINK-JPY$21.29
0.0063764 Eth
$736,556.00
34,597.320 LINK
0.1595%
50
Binance
LINK-TRY$21.44
0.0064105 Eth
$691,214.00
31,378.140 LINK
0.1446%
51
BigONE
LINK-USDT$21.19
0.0063504 Eth
$617,326.00
29,126.870 LINK
0.1342%
52
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$21.19
0.0063455 Eth
$548,984.00
42,706.830 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.1968%
53
itBit
LINK-USD$21.27
0.0063669 Eth
$541,208.00
25,444.660 LINK
0.1173%
54
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$21.21
0.0063489 Eth
$527,937.00
24,191.992 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1115%
55
Binance
LINK-EUR$21.31
0.0063736 Eth
$509,426.00
22,907.940 LINK
0.1056%
56
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$21.17
0.0063394 Eth
$473,037.00
21,320.206 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0983%
57
GMO Japan
LINK-JPY$21.35
0.0063916 Eth
$464,198.00
21,739.500 LINK
0.1002%
58
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$21.18
0.0063406 Eth
$390,838.00
17,591.510 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0811%
59
HashKey Exchange
LINK-USD$21.35
0.0063823 Eth
$387,036.00
17,108.447 LINK
0.0789%
60
Slex
LINK-ETH$21.23
0.0063541 Eth
$384,512.00
17,553.940 LINK
0.0809%
61
WhiteBIT
LINK-EUR$21.25
0.0063636 Eth
$380,226.00
17,893.720 LINK
0.0825%
62
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$21.21
0.0063490 Eth
$362,918.00
387,566.955 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
1.7863%
63
BitMart
LINK-BTC$21.24
0.0063577 Eth
$362,132.00
17,051.660 LINK
0.0786%
64
QMall
LINK-USDC$21.31
0.0063700 Eth
$331,239.00
15,123.324 LINK
0.0697%
65
Bitbegin
LINK-USDT$21.33
0.0063728 Eth
$308,916.00
14,184.667 LINK
0.0654%
66
OKX
LINK-USDC$21.24
0.0063564 Eth
$290,170.00
13,335.642 LINK
0.0615%
67
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$21.22
0.0063565 Eth
$284,459.00
12,752.102 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0588%
68
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$21.19
0.0063436 Eth
$277,341.00
291,783.326 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
1.3449%
69
Coinbase Exchange
LINK-BTC$21.19
0.0063492 Eth
$238,136.00
11,238.000 LINK
0.0518%
70
Bitci TR
LINK-TRY$21.50
0.0064395 Eth
$226,474.00
10,249.460 LINK
0.0472%
71
BitStorage
LINK-ETH$21.22
0.0063557 Eth
$205,562.00
9,686.610 LINK
0.0446%
72
LATOKEN
LINK-BTC$21.18
0.0063437 Eth
$202,476.00
9,558.668 LINK
0.0441%
73
Bitso
LINK-USD$21.35
0.0063787 Eth
$154,798.00
7,250.131 LINK
0.0334%
74
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$21.23
0.0063533 Eth
$152,222.00
6,913.896 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0319%
75
BitMart
LINK-ETH$21.24
0.0063563 Eth
$150,999.00
7,110.840 LINK
0.0328%
76
PointPay
LINK-BTC$21.29
0.0063667 Eth
$150,745.00
6,907.272 LINK
0.0318%
77
Bitkub
LINK-THB$21.37
0.0063842 Eth
$138,648.00
6,488.455 LINK
0.0299%
78
KuCoin
LINK-USDC$21.17
0.0063380 Eth
$137,064.00
6,473.241 LINK
0.0298%
79
Hotcoin
LINK-BTC$21.21
0.0063526 Eth
$135,646.00
6,395.430 LINK
0.0295%
80
Kraken
LINK-GBP$21.25
0.0063616 Eth
$124,062.00
5,837.481 LINK
0.0269%
81
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$21.26
0.0063658 Eth
$109,444.00
4,930.283 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0227%
82
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$21.36
0.0063979 Eth
$102,983.00
4,695.845 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0216%
83
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$21.23
0.0063559 Eth
$100,162.00
4,573.053 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0211%
84
Mercado Bitcoin
LINK-BRL$21.51
0.0064373 Eth
$93,608.00
4,352.742 LINK
0.0201%
85
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$21.18
0.0063406 Eth
$81,079.00
3,647.257 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0168%
86
Binance US
LINK-USDT$21.20
0.0063487 Eth
$74,212.00
3,501.114 LINK
0.0161%
87
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$21.20
0.0063487 Eth
$69,836.00
73,888.928 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.3406%
88
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$21.29
0.0063735 Eth
$67,284.00
3,071.397 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0142%
89
EXMO
LINK-BTC$21.30
0.0063762 Eth
$65,428.00
3,071.517 LINK
0.0142%
90
LFJ
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$21.23
0.0063565 Eth
$58,813.00
2,752.167 0X5947BB275C521040051D82396192181B413227A3
0.0127%
91
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$21.20
0.0063494 Eth
$55,078.00
2,501.767 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0115%
92
Hotcoin
LINK-ETH$21.24
0.0063620 Eth
$47,322.00
2,227.840 LINK
0.0103%
93
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$21.16
0.0063353 Eth
$34,751.00
2,683.279 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.0124%
94
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XDAC17F958D2EE523A2206206994597C13D831EC7$21.19
0.0063455 Eth
$29,759.00
1,358.232 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0063%
95
Uniswap V3 (Avalanche)
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$21.07
0.0063108 Eth
$28,109.00
1,291.481 0X5947BB275C521040051D82396192181B413227A3
0.0060%
96
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$21.22
0.0063582 Eth
$26,816.00
1,230.850 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0057%
97
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X1BFD67037B42CF73ACF2047067BD4F2C47D9BFD6$21.19
0.0063436 Eth
$23,059.00
1,038.654 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0048%
98
zondacrypto
LINK-USDC$21.36
0.0063768 Eth
$18,665.17
873.685 LINK
0.0040%
99
Bitexen
LINK-TRY$21.23
0.0063435 Eth
$15,847.71
746.499 LINK
0.0034%
100
KuCoin
LINK-KCS$21.22
0.0063505 Eth
$13,832.66
652.012 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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