ETH Price: $3,245.65 (-3.25%)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

732,724 ( 0.017%)

Market

Price

$24.69 @ 0.007607 ETH (-3.79%)

Onchain Market Cap

$24,690,000,000.00

Circulating Supply Market Cap

$15,754,707,227.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
0 LINK

Value
$0.00
0x0ae5a5c3bb3e8c9c13ffd9eb44b18f5f04211fa4
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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 22345.45% |ETH 0.0003846 1877.9%

Market

Volume (24H):$1,025,111,199.00
Market Capitalization:$15,754,707,227.00
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$24.78
0.0075902 Eth
$146,286,791.00
5,767,679.140 LINK
23.5129%
2
Coinbase Exchange
LINK-USD$24.55
0.0075464 Eth
$63,038,502.00
2,568,282.810 LINK
10.4700%
3
Bybit
LINK-USDT$24.79
0.0075896 Eth
$44,867,447.00
1,771,608.588 LINK
7.2222%
4
P2B
LINK-USDT$24.75
0.0075782 Eth
$28,970,261.00
1,170,433.400 LINK
4.7715%
5
OKX
LINK-USDT$24.75
0.0075778 Eth
$24,074,137.00
948,425.964 LINK
3.8664%
6
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$24.86
0.0076119 Eth
$19,772,670.00
793,795.243 0X514910771AF9CA656AF840DFF83E8264ECF986CA
3.2360%
7
DigiFinex
LINK-USDT$24.74
0.0075751 Eth
$18,067,605.00
730,248.830 LINK
2.9770%
8
Slex
LINK-USDT$24.62
0.0075629 Eth
$17,967,950.00
711,171.650 LINK
2.8992%
9
Gate.io
LINK-USDT$24.76
0.0075780 Eth
$17,128,599.00
674,644.680 LINK
2.7503%
10
XT.COM
LINK-USDT$24.76
0.0075804 Eth
$14,345,937.00
565,864.410 LINK
2.3068%
11
Azbit
LINK-USDT$24.59
0.0075548 Eth
$14,016,022.00
553,189.075 LINK
2.2552%
12
HTX
LINK-USDT$24.60
0.0075547 Eth
$13,616,606.00
539,241.857 LINK
2.1983%
13
Bitunix
LINK-USDT$24.75
0.0076281 Eth
$12,442,394.00
502,858.920 LINK
2.0500%
14
Coinstore
LINK-USDT$24.72
0.0075721 Eth
$12,143,005.00
479,787.450 LINK
1.9559%
15
MEXC
LINK-USDT$24.59
0.0075538 Eth
$11,948,691.00
485,845.070 LINK
1.9806%
16
Binance
LINK-FDUSD$24.82
0.0075984 Eth
$8,500,901.00
334,819.440 LINK
1.3649%
17
CoinW
LINK-USDT$24.74
0.0075756 Eth
$8,456,070.00
341,787.430 LINK
1.3934%
18
KuCoin
LINK-USDT$24.63
0.0075468 Eth
$8,193,283.00
332,690.870 LINK
1.3563%
19
BYDFi
LINK-USDT$24.77
0.0075849 Eth
$7,799,250.00
314,812.930 LINK
1.2834%
20
LBank
LINK-USDT$24.60
0.0075571 Eth
$6,760,862.00
274,803.570 LINK
1.1203%
21
LATOKEN
LINK-USDT$24.75
0.0075784 Eth
$6,710,073.00
271,075.662 LINK
1.1051%
22
BTSE
LINK-USDT$24.57
0.0075487 Eth
$6,354,804.00
258,620.735 LINK
1.0543%
23
Kraken
LINK-USD$24.56
0.0075438 Eth
$5,973,756.00
243,203.857 LINK
0.9915%
24
Bitvavo
LINK-EUR$24.78
0.0075854 Eth
$5,886,575.00
237,528.141 LINK
0.9683%
25
QMall
LINK-USDT$24.59
0.0075540 Eth
$5,866,512.00
231,533.704 LINK
0.9439%
26
Hotcoin
LINK-USDT$24.76
0.0075804 Eth
$5,326,748.00
215,097.630 LINK
0.8769%
27
Coinbase Exchange
LINK-EUR$24.56
0.0075497 Eth
$5,123,924.00
208,656.330 LINK
0.8506%
28
Dex-Trade
LINK-USDT$24.73
0.0075721 Eth
$4,356,073.00
176,132.870 LINK
0.7180%
29
FMCPAY
LINK-USDT$24.75
0.0075783 Eth
$3,951,264.00
156,498.398 LINK
0.6380%
30
Biconomy.com
LINK-USDT$24.53
0.0075435 Eth
$3,033,510.00
120,003.493 LINK
0.4892%
31
CoinEx
LINK-USDT$24.55
0.0075466 Eth
$2,939,801.00
116,015.251 LINK
0.4730%
32
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$24.51
0.0075361 Eth
$2,651,899.00
107,644.156 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.4388%
33
PointPay
LINK-USDT$24.84
0.0076055 Eth
$2,409,346.00
94,869.627 LINK
0.3868%
34
Coinbase Exchange
LINK-GBP$24.55
0.0075488 Eth
$2,026,825.00
82,545.720 LINK
0.3365%
35
Bitstamp
LINK-EUR$24.53
0.0075424 Eth
$1,850,169.00
75,438.049 LINK
0.3075%
36
FMCPAY
LINK-ETH$24.61
0.0075513 Eth
$1,816,565.00
73,029.120 LINK
0.2977%
37
FMCPAY
LINK-BTC$24.58
0.0075495 Eth
$1,594,282.00
63,549.800 LINK
0.2591%
38
Binance
LINK-TRY$24.95
0.0076370 Eth
$1,466,397.00
57,449.510 LINK
0.2342%
39
Phemex
LINK-USDT$24.58
0.0075518 Eth
$1,414,709.00
57,550.710 LINK
0.2346%
40
EXMO
LINK-USDT$24.55
0.0075513 Eth
$1,383,864.00
56,358.819 LINK
0.2298%
41
EarnBIT
LINK-USDT$24.93
0.0076430 Eth
$1,189,423.00
46,787.199 LINK
0.1907%
42
BitStorage
LINK-USDT$24.55
0.0075468 Eth
$1,098,907.00
44,766.970 LINK
0.1825%
43
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$24.70
0.0075648 Eth
$1,051,984.00
42,551.695 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.1735%
44
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$24.58
0.0075558 Eth
$1,047,565.00
42,209.215 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1721%
45
Bitbank
LINK-JPY$24.70
0.0075769 Eth
$969,660.00
39,262.037 LINK
0.1601%
46
Binance
LINK-EUR$24.63
0.0075550 Eth
$895,122.00
35,315.550 LINK
0.1440%
47
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$24.73
0.0076049 Eth
$876,604.00
73,862.754 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.3011%
48
Trubit
LINK-USDT$24.58
0.0075502 Eth
$817,531.00
32,421.580 LINK
0.1322%
49
BigONE
LINK-USDT$24.51
0.0075346 Eth
$806,403.00
32,907.220 LINK
0.1342%
50
QMall
LINK-USDC$24.60
0.0075574 Eth
$770,345.00
30,348.653 LINK
0.1237%
51
Coinbase Exchange
LINK-USDT$24.60
0.0075571 Eth
$759,867.00
30,885.738 LINK
0.1259%
52
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$24.72
0.0075658 Eth
$730,997.00
29,021.382 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1183%
53
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$24.83
0.0076035 Eth
$685,302.00
27,455.379 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1119%
54
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$24.72
0.0076020 Eth
$596,696.00
610,292.899 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
2.4880%
55
WhiteBIT
LINK-TRY$24.92
0.0076312 Eth
$596,128.00
23,917.820 LINK
0.0975%
56
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$24.53
0.0075357 Eth
$595,277.00
23,665.733 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0965%
57
OKX
LINK-USDC$24.74
0.0075760 Eth
$577,607.00
22,689.012 LINK
0.0925%
58
LATOKEN
LINK-BTC$24.77
0.0075843 Eth
$572,990.00
23,136.083 LINK
0.0943%
59
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$24.61
0.0075684 Eth
$544,583.00
22,138.127 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0902%
60
Coinbase Exchange
LINK-BTC$24.56
0.0075556 Eth
$541,567.00
22,050.820 LINK
0.0899%
61
Gemini
LINK-USD$24.55
0.0075513 Eth
$533,052.00
21,709.051 LINK
0.0885%
62
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$24.62
0.0075725 Eth
$491,998.00
19,810.041 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0808%
63
itBit
LINK-USD$24.51
0.0075357 Eth
$479,002.00
19,543.108 LINK
0.0797%
64
HashKey Exchange
LINK-USD$24.55
0.0075477 Eth
$456,188.00
18,088.443 LINK
0.0737%
65
GMO Japan
LINK-JPY$24.79
0.0075889 Eth
$452,274.00
18,242.000 LINK
0.0744%
66
DeGate
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$24.80
0.0075917 Eth
$351,439.00
13,851.117 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0565%
67
WhiteBIT
LINK-BTC$24.56
0.0075553 Eth
$319,439.00
13,007.060 LINK
0.0530%
68
Slex
LINK-ETH$24.57
0.0075552 Eth
$275,926.00
11,126.230 LINK
0.0454%
69
BitMart
LINK-BTC$24.57
0.0075565 Eth
$259,244.00
10,551.280 LINK
0.0430%
70
BitStorage
LINK-ETH$24.57
0.0075528 Eth
$255,758.00
10,410.740 LINK
0.0424%
71
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$24.64
0.0075676 Eth
$248,620.00
9,888.330 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0403%
72
PointPay
LINK-BTC$24.81
0.0075937 Eth
$217,796.00
8,652.627 LINK
0.0353%
73
WhiteBIT
LINK-EUR$24.86
0.0076144 Eth
$192,946.00
7,759.880 LINK
0.0316%
74
Hotcoin
LINK-BTC$24.65
0.0075600 Eth
$186,896.00
7,583.350 LINK
0.0309%
75
Coinbase Exchange
LINK-ETH$24.55
0.0075421 Eth
$185,047.00
7,537.380 LINK
0.0307%
76
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$24.86
0.0076118 Eth
$181,838.00
7,168.933 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0292%
77
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$24.69
0.0075903 Eth
$159,522.00
6,428.861 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0262%
78
Kraken
LINK-GBP$24.78
0.0075849 Eth
$152,301.00
6,146.227 LINK
0.0251%
79
CoinTR
LINK-TRY$24.72
0.0075881 Eth
$140,691.00
5,548.360 LINK
0.0226%
80
Bitso
LINK-USD$24.76
0.0075774 Eth
$131,341.00
5,305.576 LINK
0.0216%
81
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$24.68
0.0075557 Eth
$125,612.00
127,953.090 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.5216%
82
Binance US
LINK-USDT$24.80
0.0075949 Eth
$123,461.00
4,979.129 LINK
0.0203%
83
Bitkub
LINK-THB$24.69
0.0075917 Eth
$119,370.00
4,834.299 LINK
0.0197%
84
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$24.71
0.0075969 Eth
$112,922.00
115,199.695 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.4696%
85
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$24.51
0.0075361 Eth
$90,991.00
3,653.699 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0149%
86
KuCoin
LINK-BTC$24.53
0.0075427 Eth
$76,252.00
3,108.950 LINK
0.0127%
87
Gemini
LINK-BTC$24.82
0.0075980 Eth
$70,663.00
2,846.597 LINK
0.0116%
88
Hotcoin
LINK-ETH$24.74
0.0075744 Eth
$60,262.00
2,435.870 LINK
0.0099%
89
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X1BFD67037B42CF73ACF2047067BD4F2C47D9BFD6$24.77
0.0075844 Eth
$51,041.00
2,033.793 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0083%
90
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFA7F8980B0F1E64A2062791CC3B0871572F1F7F0$24.82
0.0075989 Eth
$44,121.00
1,843.900 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0075%
91
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$24.70
0.0075960 Eth
$40,056.00
1,629.236 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0066%
92
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X55D398326F99059FF775485246999027B3197955$24.86
0.0076146 Eth
$39,893.00
1,589.890 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0065%
93
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$24.75
0.0075990 Eth
$37,646.00
1,510.926 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0062%
94
Dex-Trade
LINK-ETH$24.59
0.0075601 Eth
$37,416.00
1,521.680 LINK
0.0062%
95
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XDAC17F958D2EE523A2206206994597C13D831EC7$24.73
0.0076044 Eth
$37,390.00
1,473.516 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0060%
96
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$24.58
0.0075524 Eth
$34,738.00
1,375.357 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0056%
97
Uniswap V3 (Avalanche)
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$24.59
0.0075611 Eth
$33,140.00
1,344.716 0X5947BB275C521040051D82396192181B413227A3
0.0055%
98
Uniswap V3 (Arbitrum One)
0XBA5DDD1F9D7F570DC94A51479A000E3BCE967196-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$24.51
0.0075357 Eth
$31,141.00
97.404 0XBA5DDD1F9D7F570DC94A51479A000E3BCE967196
0.0004%
99
LFJ
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$24.82
0.0076150 Eth
$22,290.00
903.247 0X5947BB275C521040051D82396192181B413227A3
0.0037%
100
Binance US
LINK-BTC$24.76
0.0075841 Eth
$17,920.23
723.625 LINK
0.0029%

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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