ETH Price: $2,624.16 (-2.06%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

733,151 ( 0.002%)

Market

Price

$18.36 @ 0.006997 ETH (-2.84%)

Onchain Market Cap

$18,360,000,000.00

Circulating Supply Market Cap

$11,720,545,719.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
0 LINK

Value
$0.00
0xdb4657860eace658c03e39f096e700907d00fa69
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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 16590.91% |ETH 0.0003846 1719.29%

Market

Volume (24H):$520,325,686.00
Market Capitalization:$11,720,545,719.00
Circulating Supply:638,099,970.00 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$18.50
0.0070246 Eth
$68,380,165.00
3,738,375.590 LINK
22.8991%
2
Coinbase Exchange
LINK-USD$18.42
0.0069992 Eth
$31,591,671.00
1,715,353.800 LINK
10.5072%
3
Bybit
LINK-USDT$18.34
0.0069666 Eth
$26,988,317.00
1,477,393.340 LINK
9.0496%
4
HTX
LINK-USDT$18.37
0.0069817 Eth
$16,280,540.00
882,989.187 LINK
5.4087%
5
Slex
LINK-USDT$18.32
0.0069593 Eth
$15,684,456.00
847,145.310 LINK
5.1891%
6
OKX
LINK-USDT$18.40
0.0069892 Eth
$10,482,734.00
570,224.156 LINK
3.4929%
7
Gate.io
LINK-USDT$18.40
0.0069907 Eth
$10,362,743.00
566,535.960 LINK
3.4703%
8
MEXC
LINK-USDT$18.37
0.0069807 Eth
$8,899,623.00
484,404.710 LINK
2.9672%
9
DigiFinex
LINK-USDT$18.38
0.0069804 Eth
$8,720,349.00
474,546.090 LINK
2.9068%
10
XT.COM
LINK-USDT$18.40
0.0069935 Eth
$6,749,634.00
369,276.390 LINK
2.2620%
11
Coinstore
LINK-USDT$18.39
0.0069852 Eth
$5,770,262.00
315,219.950 LINK
1.9309%
12
Binance
LINK-USDC$18.36
0.0069736 Eth
$5,534,609.00
303,337.760 LINK
1.8581%
13
BTSE
LINK-USDT$18.12
0.0069326 Eth
$5,391,738.00
297,532.691 LINK
1.8225%
14
KuCoin
LINK-USDT$18.41
0.0069951 Eth
$5,287,132.00
287,119.873 LINK
1.7587%
15
Bitunix
LINK-USDT$18.38
0.0069856 Eth
$4,984,518.00
271,128.910 LINK
1.6608%
16
Kraken
LINK-USD$18.38
0.0069813 Eth
$4,199,122.00
228,484.079 LINK
1.3996%
17
Hotcoin
LINK-USDT$18.34
0.0069655 Eth
$4,005,572.00
218,396.040 LINK
1.3378%
18
BYDFi
LINK-USDT$18.44
0.0070172 Eth
$3,742,031.00
202,952.720 LINK
1.2432%
19
LATOKEN
LINK-USDT$18.36
0.0069800 Eth
$3,180,598.00
173,216.339 LINK
1.0610%
20
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$18.34
0.0069651 Eth
$3,142,984.00
171,234.355 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
1.0489%
21
Bitvavo
LINK-EUR$18.35
0.0069746 Eth
$3,125,529.00
170,349.421 LINK
1.0435%
22
QMall
LINK-USDT$18.41
0.0069938 Eth
$2,823,815.00
154,557.297 LINK
0.9467%
23
Coinbase Exchange
LINK-EUR$18.37
0.0069784 Eth
$2,749,202.00
149,653.620 LINK
0.9167%
24
FMCPAY
LINK-USDT$18.34
0.0069699 Eth
$2,119,641.00
115,388.044 LINK
0.7068%
25
Biconomy.com
LINK-USDT$18.44
0.0070031 Eth
$1,680,146.00
91,122.940 LINK
0.5582%
26
Coinbase Exchange
LINK-GBP$18.38
0.0069829 Eth
$1,347,891.00
73,345.550 LINK
0.4493%
27
FMCPAY
LINK-ETH$18.33
0.0069617 Eth
$1,247,448.00
67,784.000 LINK
0.4152%
28
CoinEx
LINK-USDT$18.35
0.0069710 Eth
$1,224,354.00
66,663.175 LINK
0.4083%
29
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$18.40
0.0069888 Eth
$1,215,524.00
66,255.796 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.4058%
30
FMCPAY
LINK-BTC$18.41
0.0069948 Eth
$1,081,072.00
58,435.200 LINK
0.3579%
31
Bitstamp
LINK-USD$18.37
0.0069781 Eth
$1,058,150.00
57,602.054 LINK
0.3528%
32
PointPay
LINK-USDT$18.38
0.0069873 Eth
$1,033,200.00
56,544.157 LINK
0.3464%
33
Trubit
LINK-USDT$18.44
0.0069839 Eth
$927,252.00
50,174.660 LINK
0.3073%
34
tanX
LINK-USDC$18.33
0.0069610 Eth
$885,812.00
48,016.450 LINK
0.2941%
35
Binance
LINK-ETH$18.40
0.0069905 Eth
$873,682.00
47,733.100 LINK
0.2924%
36
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$18.30
0.0069521 Eth
$778,343.00
42,699.046 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.2615%
37
Bitbank
LINK-JPY$18.44
0.0070031 Eth
$760,434.00
41,238.577 LINK
0.2526%
38
EXMO
LINK-USDT$18.42
0.0070016 Eth
$719,999.00
39,080.876 LINK
0.2394%
39
Phemex
LINK-USDT$18.37
0.0069780 Eth
$704,257.00
38,337.560 LINK
0.2348%
40
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$18.32
0.0069583 Eth
$686,518.00
37,443.913 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.2294%
41
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$18.31
0.0069600 Eth
$675,451.00
37,440.435 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.2293%
42
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$18.39
0.0069848 Eth
$601,143.00
32,923.841 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.2017%
43
Binance
LINK-TRY$18.43
0.0070021 Eth
$558,000.00
30,324.180 LINK
0.1857%
44
BitStorage
LINK-USDT$18.41
0.0069967 Eth
$556,545.00
30,229.580 LINK
0.1852%
45
BigONE
LINK-USDT$18.42
0.0070010 Eth
$545,907.00
29,633.910 LINK
0.1815%
46
EarnBIT
LINK-USDT$18.42
0.0069992 Eth
$512,496.00
27,819.666 LINK
0.1704%
47
QMall
LINK-USDC$18.36
0.0069799 Eth
$451,697.00
24,738.855 LINK
0.1515%
48
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$18.34
0.0069701 Eth
$436,332.00
47,964.454 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.2938%
49
Binance
LINK-EUR$18.46
0.0069821 Eth
$430,240.00
23,592.790 LINK
0.1445%
50
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$18.34
0.0069682 Eth
$429,428.00
23,410.033 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1434%
51
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$18.30
0.0069521 Eth
$426,263.00
426,820.972 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
2.6145%
52
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$18.30
0.0069507 Eth
$387,579.00
21,533.240 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.1319%
53
Bitstamp
LINK-EUR$18.41
0.0069939 Eth
$355,852.00
19,327.518 LINK
0.1184%
54
WhiteBIT
LINK-TRY$18.51
0.0070317 Eth
$350,006.00
18,905.230 LINK
0.1158%
55
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$18.33
0.0069644 Eth
$317,317.00
17,302.274 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1060%
56
Slex
LINK-ETH$18.42
0.0069955 Eth
$311,775.00
16,915.230 LINK
0.1036%
57
Bybit
LINK-USDC$18.42
0.0069956 Eth
$306,790.00
16,879.206 LINK
0.1034%
58
Coinbase Exchange
LINK-ETH$18.37
0.0069794 Eth
$290,542.00
15,820.370 LINK
0.0969%
59
Coinbase Exchange
LINK-USDT$18.29
0.0069517 Eth
$289,012.00
15,801.524 LINK
0.0968%
60
Bitkub
LINK-THB$18.48
0.0070249 Eth
$269,667.00
14,588.737 LINK
0.0894%
61
BitMart
LINK-BTC$18.39
0.0069872 Eth
$257,801.00
14,015.540 LINK
0.0859%
62
Gemini
LINK-USD$18.44
0.0070051 Eth
$251,361.00
13,630.328 LINK
0.0835%
63
BitDelta
LINK-USDT$18.32
0.0069593 Eth
$246,882.00
13,448.000 LINK
0.0824%
64
Coinbase Exchange
LINK-BTC$18.50
0.0070287 Eth
$224,067.00
12,112.610 LINK
0.0742%
65
LATOKEN
LINK-BTC$18.37
0.0069785 Eth
$222,982.00
12,141.130 LINK
0.0744%
66
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$18.36
0.0069786 Eth
$211,970.00
11,661.984 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0714%
67
Bitso
LINK-USD$18.38
0.0069845 Eth
$204,903.00
11,149.101 LINK
0.0683%
68
BitStorage
LINK-ETH$18.39
0.0069895 Eth
$191,128.00
10,392.120 LINK
0.0637%
69
Bitci TR
LINK-TRY$18.34
0.0069700 Eth
$186,305.00
10,031.870 LINK
0.0614%
70
WhiteBIT
LINK-EUR$18.32
0.0069606 Eth
$186,177.00
10,160.240 LINK
0.0622%
71
GMO Japan
LINK-JPY$18.43
0.0070023 Eth
$178,245.00
9,672.500 LINK
0.0592%
72
WhiteBIT
LINK-BTC$18.41
0.0069941 Eth
$171,612.00
9,320.510 LINK
0.0571%
73
DeGate
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$18.31
0.0069607 Eth
$158,660.00
8,701.166 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0533%
74
OKX
LINK-USDC$18.42
0.0069961 Eth
$150,669.00
8,248.676 LINK
0.0505%
75
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$18.25
0.0069361 Eth
$140,640.00
7,705.666 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0472%
76
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$18.33
0.0069623 Eth
$140,239.00
7,649.215 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0469%
77
Hotcoin
LINK-BTC$18.46
0.0069865 Eth
$136,331.00
7,383.520 LINK
0.0452%
78
BYDFi
LINK-USDC$18.48
0.0069941 Eth
$124,697.00
6,748.930 LINK
0.0413%
79
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$18.34
0.0069656 Eth
$122,132.00
120,639.598 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.7390%
80
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XDAC17F958D2EE523A2206206994597C13D831EC7$18.31
0.0069597 Eth
$101,940.00
5,604.727 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0343%
81
KuCoin
LINK-USDC$18.41
0.0069929 Eth
$90,877.00
4,936.611 LINK
0.0302%
82
PancakeSwap (v2)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$18.33
0.0069644 Eth
$81,483.00
4,519.379 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0277%
83
KuCoin
LINK-BTC$18.32
0.0069593 Eth
$65,049.00
3,550.665 LINK
0.0217%
84
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$18.36
0.0069733 Eth
$59,463.00
3,235.737 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0198%
85
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$18.30
0.0069521 Eth
$46,928.00
2,569.306 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0157%
86
Uniswap V3 (Avalanche)
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$18.48
0.0070200 Eth
$46,273.00
2,537.392 0X5947BB275C521040051D82396192181B413227A3
0.0155%
87
EXMO
LINK-BTC$18.46
0.0070140 Eth
$45,630.00
2,472.333 LINK
0.0151%
88
Hotcoin
LINK-ETH$18.38
0.0069831 Eth
$36,566.00
1,989.110 LINK
0.0122%
89
Bitexen
LINK-TRY$18.49
0.0069918 Eth
$33,451.00
1,809.317 LINK
0.0111%
90
Dex-Trade
LINK-ETH$18.33
0.0069659 Eth
$26,325.00
1,435.900 LINK
0.0088%
91
THENA FUSION
0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$18.44
0.0070047 Eth
$22,813.00
33.811 0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827
0.0002%
92
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$18.32
0.0069649 Eth
$19,811.67
19,758.740 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.1210%
93
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$18.34
0.0069674 Eth
$18,431.94
1,008.971 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0062%
94
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFA7F8980B0F1E64A2062791CC3B0871572F1F7F0$18.41
0.0069944 Eth
$18,344.40
991.769 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0061%
95
CoinEx
LINK-USDC$18.45
0.0070004 Eth
$18,196.50
998.584 LINK
0.0061%
96
Upbit
LINK-BTC$18.35
0.0069728 Eth
$17,869.88
973.822 LINK
0.0060%
97
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X1BFD67037B42CF73ACF2047067BD4F2C47D9BFD6$18.32
0.0069609 Eth
$16,953.06
922.293 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0056%
98
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X55D398326F99059FF775485246999027B3197955$18.36
0.0069737 Eth
$14,842.14
813.986 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0050%
99
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$18.32
0.0069604 Eth
$12,727.43
697.634 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0043%
100
Kraken
LINK-JPY$18.29
0.0069477 Eth
$9,063.47
495.547 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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