ETH Price: $2,526.25 (+0.37%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

722,162 ( 0.000%)

Market

Price

$11.83 @ 0.004683 ETH (+4.84%)

Onchain Market Cap

$11,830,000,000.00

Circulating Supply Market Cap

$7,417,947,719.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
0.5 LINK

Value
$5.92 ( ~0.00234339080736755 Eth) [0.0000%]
0x1584aa583d37c45666d8a66192173d939c523bbb
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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 10654.55% |ETH 0.0003846 1117.63%

Market

Volume (24H):$398,670,209.00
Market Capitalization:$7,417,947,719.00
Circulating Supply:626,849,971.00 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
WhiteBIT
LINK-USDT$11.83
0.0046799 Eth
$17,039,745.00
1,440,743.710 LINK
11.2369%
2
Coinbase Exchange
LINK-USD$11.80
0.0046696 Eth
$15,338,203.00
1,299,517.350 LINK
10.1354%
3
HTX
LINK-USDT$11.80
0.0046728 Eth
$11,685,472.00
1,010,170.545 LINK
7.8787%
4
Bitget
LINK-USDT$11.80
0.0046722 Eth
$9,451,532.00
817,063.620 LINK
6.3726%
5
Bybit
LINK-USDT$11.81
0.0046770 Eth
$7,358,837.00
633,142.725 LINK
4.9381%
6
Upbit
LINK-KRW$11.81
0.0046774 Eth
$6,747,147.00
571,145.654 LINK
4.4546%
7
P2B
LINK-USDT$11.81
0.0046735 Eth
$6,054,999.00
512,542.460 LINK
3.9975%
8
Azbit
LINK-USDT$11.81
0.0046961 Eth
$5,504,375.00
476,373.730 LINK
3.7154%
9
OKX
LINK-USDT$11.80
0.0046730 Eth
$5,110,605.00
437,948.530 LINK
3.4157%
10
Slex
LINK-USDT$11.85
0.0046912 Eth
$4,748,205.00
408,776.330 LINK
3.1882%
11
BTSE
LINK-USDT$11.78
0.0046864 Eth
$4,105,727.00
348,425.120 LINK
2.7175%
12
DigiFinex
LINK-USDT$11.80
0.0046739 Eth
$3,891,865.00
329,696.570 LINK
2.5714%
13
Biconomy.com
LINK-USDT$11.79
0.0046879 Eth
$3,591,323.00
309,748.160 LINK
2.4158%
14
KuCoin
LINK-USDT$11.80
0.0046712 Eth
$3,251,453.00
275,598.519 LINK
2.1495%
15
CoinW
LINK-USDT$11.81
0.0046776 Eth
$3,154,980.00
267,059.430 LINK
2.0829%
16
XT.COM
LINK-USDT$11.80
0.0046726 Eth
$2,922,019.00
250,905.200 LINK
1.9569%
17
Hotcoin
LINK-USDT$11.86
0.0047030 Eth
$2,626,973.00
221,436.130 LINK
1.7271%
18
Bitunix
LINK-USDT$11.86
0.0046983 Eth
$2,597,860.00
219,217.270 LINK
1.7098%
19
Coinstore
LINK-USDT$11.83
0.0046838 Eth
$2,121,761.00
182,240.150 LINK
1.4214%
20
LBank
LINK-USDT$11.78
0.0046901 Eth
$1,927,907.00
163,633.470 LINK
1.2762%
21
Trubit
LINK-USDT$11.79
0.0046692 Eth
$1,858,399.00
161,153.960 LINK
1.2569%
22
C-Patex
LINK-USDT$11.80
0.0046981 Eth
$1,857,514.00
157,390.596 LINK
1.2275%
23
ProBit Global
LINK-USDT$11.82
0.0046874 Eth
$1,820,246.00
154,048.431 LINK
1.2015%
24
AscendEX (BitMax)
LINK-USDT$11.76
0.0046552 Eth
$1,767,169.00
150,317.800 LINK
1.1724%
25
Bithumb
LINK-KRW$11.80
0.0046677 Eth
$1,600,629.00
135,658.521 LINK
1.0580%
26
BYDFi
LINK-USDT$11.83
0.0046833 Eth
$1,443,964.00
122,039.600 LINK
0.9518%
27
Bitexen
LINK-TRY$11.79
0.0046663 Eth
$1,276,704.00
108,330.880 LINK
0.8449%
28
Binance
LINK-FDUSD$11.87
0.0047015 Eth
$1,170,411.00
100,479.870 LINK
0.7837%
29
WhiteBIT
LINK-BTC$11.81
0.0046762 Eth
$994,302.00
84,195.480 LINK
0.6567%
30
Dex-Trade
LINK-USDT$11.81
0.0046975 Eth
$972,405.00
82,313.870 LINK
0.6420%
31
Azbit
LINK-ETH$11.85
0.0046932 Eth
$959,029.00
82,564.898 LINK
0.6440%
32
HashKey Global
LINK-USDT$11.82
0.0046750 Eth
$948,808.00
83,345.906 LINK
0.6500%
33
Bitvavo
LINK-EUR$11.83
0.0046796 Eth
$861,397.00
72,836.348 LINK
0.5681%
34
Bitexen
LINK-USDT$11.83
0.0046858 Eth
$793,276.00
67,030.180 LINK
0.5228%
35
tanX
LINK-USDC$11.83
0.0046838 Eth
$623,048.00
53,745.100 LINK
0.4192%
36
Binance
LINK-USDC$11.80
0.0046842 Eth
$571,207.00
49,131.420 LINK
0.3832%
37
LATOKEN
LINK-USDT$11.82
0.0046778 Eth
$504,063.00
42,631.555 LINK
0.3325%
38
PointPay
LINK-USDT$11.81
0.0046740 Eth
$468,126.00
40,168.276 LINK
0.3133%
39
BigONE
LINK-USDT$11.85
0.0046951 Eth
$422,236.00
35,631.040 LINK
0.2779%
40
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$11.83
0.0046814 Eth
$417,820.00
35,697.246 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.2784%
41
ProBit Global
LINK-BTC$11.81
0.0046749 Eth
$414,612.00
35,118.572 LINK
0.2739%
42
EXMO
LINK-USDT$11.80
0.0046696 Eth
$407,034.00
34,483.455 LINK
0.2689%
43
LATOKEN
LINK-BTC$11.82
0.0046761 Eth
$393,795.00
33,317.816 LINK
0.2599%
44
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$11.82
0.0046770 Eth
$380,966.00
33,019.895 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.2575%
45
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$11.77
0.0046557 Eth
$366,540.00
31,566.733 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.2462%
46
CoinEx
LINK-USDT$11.80
0.0046981 Eth
$340,519.00
29,411.394 LINK
0.2294%
47
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$11.79
0.0046646 Eth
$322,933.00
27,728.847 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.2163%
48
Phemex
LINK-USDT$11.82
0.0046932 Eth
$321,937.00
27,235.990 LINK
0.2124%
49
Bybit
LINK-USDC$11.84
0.0046886 Eth
$292,944.00
25,171.359 LINK
0.1963%
50
Coinbase Exchange
LINK-EUR$11.79
0.0046710 Eth
$268,468.00
22,777.380 LINK
0.1776%
51
Bitbank
LINK-JPY$11.86
0.0046961 Eth
$259,502.00
21,872.445 LINK
0.1706%
52
Binance
LINK-TRY$11.78
0.0046848 Eth
$244,615.00
20,891.960 LINK
0.1629%
53
Hotcoin
LINK-BTC$11.82
0.0047052 Eth
$237,810.00
20,122.740 LINK
0.1569%
54
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$11.78
0.0046603 Eth
$236,280.00
20,488.403 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.1598%
55
Gemini
LINK-USD$11.84
0.0046844 Eth
$224,376.00
18,948.644 LINK
0.1478%
56
Binance
LINK-ETH$11.83
0.0046858 Eth
$220,733.00
18,622.380 LINK
0.1452%
57
Coinbase Exchange
LINK-GBP$11.82
0.0046845 Eth
$199,823.00
16,904.380 LINK
0.1318%
58
BitMart
LINK-BTC$11.84
0.0046870 Eth
$191,697.00
16,195.280 LINK
0.1263%
59
WhiteBIT
LINK-EUR$11.81
0.0046724 Eth
$188,988.00
16,004.970 LINK
0.1248%
60
Hotcoin
LINK-ETH$11.78
0.0046856 Eth
$140,809.00
11,951.470 LINK
0.0932%
61
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$11.84
0.0046860 Eth
$135,098.00
11,585.298 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0904%
62
WhiteBIT
LINK-TRY$11.82
0.0046923 Eth
$132,098.00
11,173.030 LINK
0.0871%
63
BitDelta
LINK-USDT$11.83
0.0046814 Eth
$130,836.00
11,296.000 LINK
0.0881%
64
Slex
LINK-BTC$11.81
0.0046953 Eth
$123,666.00
10,615.300 LINK
0.0828%
65
BYDFi
LINK-USDC$11.84
0.0046844 Eth
$119,486.00
10,090.600 LINK
0.0787%
66
Coinbase Exchange
LINK-ETH$11.83
0.0046841 Eth
$107,701.00
9,104.510 LINK
0.0710%
67
Bitci TR
LINK-TRY$11.86
0.0046906 Eth
$95,359.00
8,214.560 LINK
0.0641%
68
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$11.83
0.0046814 Eth
$94,043.00
92,682.959 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.7229%
69
Binance
LINK-EUR$11.81
0.0046753 Eth
$86,974.00
7,485.200 LINK
0.0584%
70
Slex
LINK-ETH$11.79
0.0046912 Eth
$81,359.00
6,977.430 LINK
0.0544%
71
PointPay
LINK-BTC$11.83
0.0046821 Eth
$78,198.00
6,699.018 LINK
0.0522%
72
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$11.85
0.0046912 Eth
$78,007.00
6,625.873 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0517%
73
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$11.80
0.0046852 Eth
$68,726.00
67,587.091 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.5271%
74
Binance
LINK-BRL$11.87
0.0047006 Eth
$59,193.00
5,027.750 LINK
0.0392%
75
Bitkub
LINK-THB$11.83
0.0047032 Eth
$55,406.00
4,684.772 LINK
0.0365%
76
Bitso
LINK-USD$11.83
0.0047060 Eth
$53,638.00
4,533.457 LINK
0.0354%
77
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$11.83
0.0046814 Eth
$47,005.00
4,030.581 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0314%
78
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$11.83
0.0046814 Eth
$44,469.00
3,837.094 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0299%
79
Binance
LINK-BNB$11.82
0.0046792 Eth
$39,842.00
3,424.789 LINK
0.0267%
80
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$11.83
0.0046879 Eth
$38,360.00
3,313.997 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0258%
81
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$11.82
0.0046757 Eth
$36,179.00
3,104.375 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0242%
82
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$11.80
0.0046676 Eth
$31,568.00
2,706.294 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0211%
83
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$11.82
0.0046912 Eth
$29,901.00
29,424.124 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.2295%
84
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$11.81
0.0046732 Eth
$29,597.00
2,526.974 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0197%
85
Binance US
LINK-USDT$11.83
0.0046838 Eth
$27,837.00
2,352.662 LINK
0.0183%
86
THENA FUSION
0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$11.78
0.0046610 Eth
$21,710.00
33.449 0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827
0.0003%
87
Coinone
LINK-KRW$11.84
0.0046847 Eth
$17,852.50
1,507.539 LINK
0.0118%
88
KuCoin
LINK-KCS$11.83
0.0046830 Eth
$16,879.66
1,427.153 LINK
0.0111%
89
PancakeSwap V1 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$11.75
0.0046526 Eth
$12,902.51
993.254 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0077%
90
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X1BFD67037B42CF73ACF2047067BD4F2C47D9BFD6$11.82
0.0046774 Eth
$10,066.46
858.462 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0067%
91
Pangolin
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$11.75
0.0046488 Eth
$9,349.73
811.455 0X5947BB275C521040051D82396192181B413227A3
0.0063%
92
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$11.79
0.0046711 Eth
$8,406.55
725.253 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0057%
93
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$11.79
0.0046694 Eth
$7,590.06
7,508.766 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.0586%
94
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$11.79
0.0046820 Eth
$7,237.89
621.929 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0049%
95
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X55D398326F99059FF775485246999027B3197955$11.79
0.0046621 Eth
$6,707.99
579.533 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0045%
96
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$11.80
0.0046666 Eth
$3,921.23
341.231 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0027%
97
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$11.80
0.0046700 Eth
$3,732.69
458.951 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.0036%
98
CoinEx
LINK-BTC$11.76
0.0046833 Eth
$3,138.44
268.625 LINK
0.0021%
99
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$11.76
0.0046581 Eth
$2,953.56
253.645 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0020%
100
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X61299774020DA444AF134C82FA83E3810B309991$11.83
0.0046838 Eth
$2,047.18
174.817 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0014%

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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