ETH Price: $3,392.63 (+1.42%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

728,634 ( 0.041%)

Market

Price

$22.04 @ 0.006496 ETH (-1.88%)

Onchain Market Cap

$22,040,000,000.00

Circulating Supply Market Cap

$13,915,030,803.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
66.503024257307721485 LINK

Value
$1,465.73 ( ~0.432033664641738 Eth) [0.0000%]
0x41a61d1e44fe0c26a7f00c81907a31766a1024dd
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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 19936.36% |ETH 0.0003846 1589.03%

Market

Volume (24H):$1,076,091,940.00
Market Capitalization:$13,915,030,803.00
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$22.00
0.0064822 Eth
$113,772,792.00
5,276,482.410 LINK
20.0487%
2
Coinbase Exchange
LINK-USD$22.03
0.0064911 Eth
$47,505,455.00
2,156,789.940 LINK
8.1950%
3
Bybit
LINK-USDT$22.06
0.0064997 Eth
$38,098,605.00
1,765,732.528 LINK
6.7091%
4
Upbit
LINK-KRW$22.36
0.0065925 Eth
$36,459,231.00
1,630,264.914 LINK
6.1944%
5
WhiteBIT
LINK-USDT$22.10
0.0065009 Eth
$24,786,265.00
1,121,800.840 LINK
4.2624%
6
P2B
LINK-USDT$21.96
0.0064727 Eth
$24,243,458.00
1,103,816.800 LINK
4.1941%
7
Slex
LINK-USDT$22.09
0.0064987 Eth
$21,298,860.00
988,653.310 LINK
3.7565%
8
CoinW
LINK-USDT$22.02
0.0064887 Eth
$21,170,722.00
961,519.340 LINK
3.6534%
9
MEXC
LINK-USDT$22.02
0.0064925 Eth
$20,912,988.00
949,588.760 LINK
3.6081%
10
OKX
LINK-USDT$22.01
0.0064892 Eth
$19,693,552.00
912,589.890 LINK
3.4675%
11
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$22.10
0.0065121 Eth
$16,907,999.00
763,413.167 0X514910771AF9CA656AF840DFF83E8264ECF986CA
2.9007%
12
DigiFinex
LINK-USDT$21.99
0.0064795 Eth
$15,113,695.00
687,186.820 LINK
2.6111%
13
FameEX
LINK-USDT$22.05
0.0064999 Eth
$11,369,113.00
527,195.336 LINK
2.0032%
14
XT.COM
LINK-USDT$22.04
0.0064959 Eth
$11,340,865.00
525,820.140 LINK
1.9979%
15
Azbit
LINK-USDT$22.11
0.0065068 Eth
$11,248,249.00
521,605.636 LINK
1.9819%
16
Coinstore
LINK-USDT$22.02
0.0064892 Eth
$10,333,367.00
479,502.500 LINK
1.8219%
17
HTX
LINK-USDT$22.07
0.0065058 Eth
$9,760,267.00
452,942.360 LINK
1.7210%
18
Bitunix
LINK-USDT$22.07
0.0065057 Eth
$9,557,184.00
432,998.230 LINK
1.6452%
19
BYDFi
LINK-USDT$22.11
0.0065075 Eth
$7,562,710.00
341,997.980 LINK
1.2995%
20
Biconomy.com
LINK-USDT$22.02
0.0064921 Eth
$6,962,053.00
322,905.722 LINK
1.2269%
21
KuCoin
LINK-USDT$22.08
0.0065097 Eth
$6,245,211.00
282,806.862 LINK
1.0746%
22
LATOKEN
LINK-USDT$21.96
0.0064822 Eth
$5,332,384.00
242,822.698 LINK
0.9226%
23
LBank
LINK-USDT$22.06
0.0065043 Eth
$4,826,018.00
218,736.830 LINK
0.8311%
24
QMall
LINK-USDT$22.02
0.0064898 Eth
$4,645,077.00
215,587.431 LINK
0.8192%
25
Binance
LINK-USDC$22.05
0.0064987 Eth
$4,322,529.00
200,832.830 LINK
0.7631%
26
Dex-Trade
LINK-USDT$21.93
0.0064810 Eth
$3,805,872.00
173,522.194 LINK
0.6593%
27
Kraken
LINK-USD$22.02
0.0064887 Eth
$3,793,585.00
172,240.506 LINK
0.6545%
28
Bitvavo
LINK-EUR$22.13
0.0065128 Eth
$3,588,605.00
162,165.690 LINK
0.6162%
29
Bitstamp
LINK-USD$22.09
0.0065079 Eth
$3,527,728.00
159,697.963 LINK
0.6068%
30
Hotcoin
LINK-USDT$22.12
0.0065107 Eth
$2,669,058.00
120,659.340 LINK
0.4585%
31
Coinbase Exchange
LINK-GBP$22.03
0.0064911 Eth
$2,649,233.00
120,276.690 LINK
0.4570%
32
CoinEx
LINK-USDT$22.01
0.0064879 Eth
$2,626,190.00
121,597.613 LINK
0.4620%
33
Bybit
LINK-USDC$22.07
0.0065031 Eth
$2,401,726.00
112,075.275 LINK
0.4258%
34
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$22.09
0.0065096 Eth
$2,250,057.00
101,964.774 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.3874%
35
Dcoin
LINK-USDT$22.04
0.0064953 Eth
$2,148,373.00
97,475.000 LINK
0.3704%
36
PointPay
LINK-USDT$22.01
0.0064871 Eth
$1,815,076.00
84,368.045 LINK
0.3206%
37
Kraken
LINK-USDT$22.06
0.0064987 Eth
$1,776,051.00
80,514.368 LINK
0.3059%
38
Coinbase Exchange
LINK-ETH$21.99
0.0064818 Eth
$1,715,247.00
78,009.390 LINK
0.2964%
39
EXMO
LINK-USDT$22.09
0.0065120 Eth
$1,667,573.00
75,487.446 LINK
0.2868%
40
Coinbase Exchange
LINK-EUR$22.04
0.0064966 Eth
$1,604,601.00
72,788.240 LINK
0.2766%
41
Phemex
LINK-USDT$22.06
0.0065037 Eth
$1,401,890.00
63,541.230 LINK
0.2414%
42
tanX
LINK-USDC$22.05
0.0064996 Eth
$1,010,882.00
46,849.670 LINK
0.1780%
43
Coinbase Exchange
LINK-USDT$22.04
0.0064956 Eth
$996,176.00
45,196.548 LINK
0.1717%
44
WhiteBIT
LINK-BTC$21.96
0.0064814 Eth
$989,754.00
45,076.600 LINK
0.1713%
45
BitStorage
LINK-USDT$22.04
0.0064951 Eth
$939,129.00
42,609.070 LINK
0.1619%
46
EarnBIT
LINK-USDT$22.00
0.0064852 Eth
$919,791.00
42,721.654 LINK
0.1623%
47
Binance
LINK-TRY$22.15
0.0065287 Eth
$883,611.00
40,648.750 LINK
0.1545%
48
Bitbank
LINK-JPY$22.07
0.0065048 Eth
$788,772.00
35,746.426 LINK
0.1358%
49
WhiteBIT
LINK-TRY$22.09
0.0065195 Eth
$784,910.00
35,538.420 LINK
0.1350%
50
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$21.97
0.0064768 Eth
$773,092.00
35,359.291 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1344%
51
GMO Japan
LINK-JPY$22.11
0.0065168 Eth
$741,317.00
33,534.300 LINK
0.1274%
52
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$22.08
0.0065082 Eth
$673,439.00
30,182.885 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.1147%
53
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$22.01
0.0064888 Eth
$583,646.00
26,159.615 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0994%
54
Gemini
LINK-USD$21.97
0.0064718 Eth
$545,612.00
24,837.411 LINK
0.0944%
55
itBit
LINK-USD$21.98
0.0064864 Eth
$540,569.00
24,593.677 LINK
0.0934%
56
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$22.10
0.0065121 Eth
$505,766.00
37,362.255 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.1420%
57
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$22.01
0.0064899 Eth
$487,355.00
22,226.962 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0845%
58
BitMart
LINK-BTC$22.03
0.0064916 Eth
$400,880.00
18,193.260 LINK
0.0691%
59
BigONE
LINK-USDT$22.05
0.0064874 Eth
$390,973.00
17,732.030 LINK
0.0674%
60
Slex
LINK-ETH$22.08
0.0065007 Eth
$381,041.00
17,427.080 LINK
0.0662%
61
Coinbase Exchange
LINK-BTC$22.02
0.0064913 Eth
$370,129.00
16,809.340 LINK
0.0639%
62
HashKey Exchange
LINK-USD$22.07
0.0065020 Eth
$332,724.00
15,504.653 LINK
0.0589%
63
WhiteBIT
LINK-EUR$22.06
0.0065005 Eth
$315,972.00
14,325.040 LINK
0.0544%
64
OKX
LINK-USDC$22.06
0.0065033 Eth
$314,478.00
14,648.484 LINK
0.0557%
65
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$22.10
0.0065095 Eth
$302,516.00
13,692.471 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0520%
66
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$22.06
0.0064978 Eth
$300,091.00
295,692.497 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
1.1235%
67
LATOKEN
LINK-BTC$22.03
0.0064928 Eth
$258,903.00
11,754.900 LINK
0.0447%
68
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$22.10
0.0065122 Eth
$254,039.00
11,588.494 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0440%
69
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$21.97
0.0064770 Eth
$232,174.00
228,953.112 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.8699%
70
BitStorage
LINK-ETH$22.05
0.0064969 Eth
$220,050.00
9,981.450 LINK
0.0379%
71
KuCoin
LINK-USDC$22.01
0.0064869 Eth
$216,062.00
9,818.497 LINK
0.0373%
72
PointPay
LINK-BTC$22.03
0.0064956 Eth
$197,469.00
9,146.887 LINK
0.0348%
73
BitMart
LINK-ETH$22.02
0.0064898 Eth
$180,132.00
8,182.100 LINK
0.0311%
74
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$22.03
0.0064935 Eth
$169,198.00
7,722.893 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0293%
75
Kraken
LINK-GBP$22.17
0.0065302 Eth
$162,581.00
7,334.810 LINK
0.0279%
76
Bitso
LINK-USD$22.01
0.0064875 Eth
$154,241.00
7,008.755 LINK
0.0266%
77
Bitkub
LINK-THB$21.98
0.0064885 Eth
$150,659.00
6,855.811 LINK
0.0260%
78
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$22.00
0.0064827 Eth
$139,205.00
6,329.416 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0240%
79
DeGate
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$21.99
0.0064814 Eth
$124,672.00
5,782.164 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0220%
80
Mercado Bitcoin
LINK-BRL$22.29
0.0065706 Eth
$106,196.00
4,764.767 LINK
0.0181%
81
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$22.04
0.0064942 Eth
$105,543.00
4,845.144 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0184%
82
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$21.97
0.0064770 Eth
$93,402.00
4,251.408 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0162%
83
Hotcoin
LINK-BTC$22.12
0.0065110 Eth
$91,092.00
4,117.800 LINK
0.0156%
84
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$22.00
0.0064861 Eth
$88,013.00
4,010.577 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0152%
85
EXMO
LINK-BTC$22.13
0.0065241 Eth
$83,462.00
3,771.167 LINK
0.0143%
86
Binance US
LINK-USDT$21.97
0.0064750 Eth
$76,183.00
3,467.412 LINK
0.0132%
87
PancakeSwap (v2)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$22.00
0.0064867 Eth
$72,603.00
3,262.772 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0124%
88
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$21.97
0.0064770 Eth
$67,887.00
3,139.389 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0119%
89
BTCMarkets
LINK-AUD$21.97
0.0064730 Eth
$66,405.00
3,023.053 LINK
0.0115%
90
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$22.09
0.0065096 Eth
$60,712.00
60,070.037 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.2282%
91
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$22.00
0.0064844 Eth
$57,472.00
2,633.998 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0100%
92
KuCoin
LINK-BTC$22.00
0.0064857 Eth
$57,256.00
2,602.362 LINK
0.0099%
93
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$22.10
0.0065117 Eth
$46,249.00
3,409.863 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.0130%
94
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XDAC17F958D2EE523A2206206994597C13D831EC7$22.06
0.0065022 Eth
$43,763.00
1,999.039 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0076%
95
Bitexen
LINK-TRY$21.94
0.0064572 Eth
$40,070.00
1,826.271 LINK
0.0069%
96
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$22.05
0.0065013 Eth
$31,282.00
1,424.341 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0054%
97
Hotcoin
LINK-ETH$22.04
0.0064956 Eth
$29,496.00
1,338.110 LINK
0.0051%
98
zondacrypto
LINK-USDC$21.91
0.0064578 Eth
$21,589.00
985.125 LINK
0.0037%
99
THENA FUSION
0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$22.06
0.0065032 Eth
$20,022.00
25.825 0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827
0.0001%
100
Ace
LINK-USDT$22.03
0.0064930 Eth
$4,421.49
204.900 LINK
0.0008%

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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