ETH Price: $2,469.47 (+1.15%)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

722,390 ( 0.002%)

Market

Price

$10.79 @ 0.004367 ETH (-1.89%)

Onchain Market Cap

$10,790,000,000.00

Circulating Supply Market Cap

$6,762,063,563.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
85.90071 LINK

Value
$926.87 ( ~0.375331528622679 Eth) [0.0000%]
0x632b0f586a57076a2b06f7ca7af954cfed5168e7
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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 9709.09% |ETH 0.0003846 1035.47%

Market

Volume (24H):$389,824,223.00
Market Capitalization:$6,762,063,563.00
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
Binance
LINK-USDT$10.80
0.0043663 Eth
$28,730,162.00
2,664,259.230 LINK
14.4619%
2
WhiteBIT
LINK-USDT$10.78
0.0043599 Eth
$27,220,728.00
2,525,674.520 LINK
13.7097%
3
HTX
LINK-USDT$10.78
0.0043610 Eth
$11,146,810.00
1,032,782.081 LINK
5.6061%
4
Bitget
LINK-USDT$10.78
0.0043611 Eth
$9,484,619.00
878,966.301 LINK
4.7711%
5
Bybit
LINK-USDT$10.77
0.0043569 Eth
$7,814,639.00
725,537.809 LINK
3.9383%
6
Coinbase Exchange
LINK-USD$10.78
0.0043589 Eth
$7,347,687.00
681,919.950 LINK
3.7015%
7
OKX
LINK-USDT$10.77
0.0043583 Eth
$6,703,099.00
622,568.436 LINK
3.3794%
8
BTSE
LINK-USDT$10.78
0.0043606 Eth
$6,475,659.00
600,745.343 LINK
3.2609%
9
P2B
LINK-USDT$10.78
0.0043620 Eth
$5,978,497.00
554,477.330 LINK
3.0098%
10
WEEX
LINK-USDT$10.81
0.0043700 Eth
$5,851,803.00
543,384.210 LINK
2.9496%
11
Slex
LINK-USDT$10.79
0.0043653 Eth
$5,748,021.00
532,179.860 LINK
2.8887%
12
Ourbit
LINK-USDT$10.77
0.0043570 Eth
$5,261,382.00
488,268.050 LINK
2.6504%
13
Azbit
LINK-USDT$10.77
0.0043604 Eth
$5,199,280.00
481,226.730 LINK
2.6122%
14
Gate.io
LINK-USDT$10.77
0.0043583 Eth
$5,027,445.00
469,893.530 LINK
2.5506%
15
BVOX
LINK-USDT$10.82
0.0043702 Eth
$4,608,689.00
426,074.510 LINK
2.3128%
16
DigiFinex
LINK-USDT$10.78
0.0043614 Eth
$4,032,686.00
374,116.450 LINK
2.0307%
17
Biconomy.com
LINK-USDT$10.78
0.0043603 Eth
$3,802,422.00
352,243.340 LINK
1.9120%
18
Binance
LINK-ETH$10.78
0.0043620 Eth
$3,362,832.00
304,075.560 LINK
1.6506%
19
Bitunix
LINK-USDT$10.78
0.0043600 Eth
$3,300,237.00
306,081.370 LINK
1.6614%
20
CoinW
LINK-USDT$10.78
0.0043606 Eth
$2,949,254.00
273,585.350 LINK
1.4851%
21
XT.COM
LINK-USDT$10.78
0.0043623 Eth
$2,855,533.00
264,819.230 LINK
1.4375%
22
ProBit Global
LINK-USDT$10.78
0.0043600 Eth
$2,621,415.00
243,225.380 LINK
1.3203%
23
Hotcoin
LINK-USDT$10.78
0.0043637 Eth
$2,463,074.00
228,416.020 LINK
1.2399%
24
KuCoin
LINK-USDT$10.78
0.0043611 Eth
$2,303,955.00
213,714.667 LINK
1.1601%
25
Trubit
LINK-USDT$10.78
0.0043602 Eth
$2,286,222.00
212,140.220 LINK
1.1515%
26
LBank
LINK-USDT$10.77
0.0043577 Eth
$2,082,554.00
193,323.950 LINK
1.0494%
27
Coinstore
LINK-USDT$10.76
0.0043538 Eth
$2,070,149.00
192,062.120 LINK
1.0425%
28
AscendEX (BitMax)
LINK-USDT$10.75
0.0043512 Eth
$1,691,573.00
157,297.100 LINK
0.8538%
29
BYDFi
LINK-USDT$10.77
0.0043577 Eth
$1,410,826.00
130,956.690 LINK
0.7108%
30
WhiteBIT
LINK-BTC$10.78
0.0043596 Eth
$1,051,496.00
97,570.120 LINK
0.5296%
31
Nonkyc.io
LINK-USDT$10.81
0.0043751 Eth
$995,115.00
92,745.847 LINK
0.5034%
32
Dex-Trade
LINK-USDT$10.77
0.0043582 Eth
$959,321.00
89,046.010 LINK
0.4834%
33
XT.COM
LINK-ETH$10.78
0.0043621 Eth
$941,524.00
85,142.200 LINK
0.4622%
34
Azbit
LINK-ETH$10.79
0.0043670 Eth
$932,118.00
85,507.744 LINK
0.4641%
35
HashKey Global
LINK-USDT$10.78
0.0043609 Eth
$883,914.00
80,409.934 LINK
0.4365%
36
Bitvavo
LINK-EUR$10.79
0.0043660 Eth
$754,464.00
69,917.143 LINK
0.3795%
37
AscendEX (BitMax)
LINK-BTC$10.84
0.0043859 Eth
$587,793.00
54,225.500 LINK
0.2943%
38
LATOKEN
LINK-USDT$10.79
0.0043663 Eth
$566,475.00
52,492.851 LINK
0.2849%
39
EXMO
LINK-USDT$10.76
0.0043556 Eth
$566,100.00
52,587.725 LINK
0.2855%
40
BitStorage
LINK-ETH$10.79
0.0043639 Eth
$492,539.00
45,658.960 LINK
0.2478%
41
PointPay
LINK-USDT$10.78
0.0043624 Eth
$482,132.00
44,708.876 LINK
0.2427%
42
CoinEx
LINK-USDT$10.82
0.0043731 Eth
$444,924.00
41,212.173 LINK
0.2237%
43
BigONE
LINK-USDT$10.74
0.0043409 Eth
$423,285.00
39,409.400 LINK
0.2139%
44
itBit
LINK-USD$10.81
0.0043698 Eth
$416,496.00
38,528.738 LINK
0.2091%
45
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$10.85
0.0043896 Eth
$413,345.00
38,046.397 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.2065%
46
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$10.77
0.0043585 Eth
$372,847.00
34,371.132 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.1866%
47
Bybit
LINK-USDC$10.78
0.0043604 Eth
$368,530.00
34,258.955 LINK
0.1860%
48
Hotcoin
LINK-ETH$10.79
0.0043641 Eth
$363,898.00
33,738.720 LINK
0.1831%
49
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$10.79
0.0043658 Eth
$353,472.00
32,245.779 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1750%
50
EarnBIT
LINK-USDT$10.78
0.0043587 Eth
$317,524.00
29,469.035 LINK
0.1600%
51
WhiteBIT
LINK-EUR$10.84
0.0043862 Eth
$310,766.00
28,661.300 LINK
0.1556%
52
Phemex
LINK-USDT$10.77
0.0043601 Eth
$292,087.00
27,112.500 LINK
0.1472%
53
ProBit Global
LINK-BTC$10.78
0.0043608 Eth
$270,794.00
25,120.356 LINK
0.1364%
54
LATOKEN
LINK-BTC$10.79
0.0043638 Eth
$267,876.00
24,837.341 LINK
0.1348%
55
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$10.77
0.0043593 Eth
$266,126.00
24,573.402 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1334%
56
Slex
LINK-ETH$10.80
0.0043680 Eth
$199,094.00
18,275.790 LINK
0.0992%
57
BitMart
LINK-BTC$10.78
0.0043592 Eth
$194,829.00
18,079.260 LINK
0.0981%
58
Coinbase Exchange
LINK-EUR$10.80
0.0043697 Eth
$162,517.00
15,048.170 LINK
0.0817%
59
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$10.79
0.0043673 Eth
$160,969.00
14,908.422 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0809%
60
Bitbank
LINK-JPY$10.81
0.0043755 Eth
$148,983.00
13,776.558 LINK
0.0748%
61
BitDelta
LINK-USDT$10.78
0.0043619 Eth
$145,412.00
13,487.000 LINK
0.0732%
62
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$10.78
0.0043596 Eth
$134,262.00
12,528.302 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0680%
63
Coinbase Exchange
LINK-GBP$10.79
0.0043674 Eth
$125,132.00
11,592.660 LINK
0.0629%
64
BYDFi
LINK-USDC$10.80
0.0043660 Eth
$116,221.00
10,764.090 LINK
0.0584%
65
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$10.81
0.0043749 Eth
$112,898.00
10,393.710 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0564%
66
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$10.77
0.0043581 Eth
$112,146.00
111,922.464 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.6075%
67
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$10.77
0.0043579 Eth
$88,498.00
88,126.201 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.4784%
68
OKX
LINK-USDC$10.77
0.0043583 Eth
$86,237.00
8,020.128 LINK
0.0435%
69
Slex
LINK-BTC$10.77
0.0043577 Eth
$77,715.00
7,132.100 LINK
0.0387%
70
GMO Japan
LINK-JPY$10.85
0.0043889 Eth
$71,093.00
6,552.600 LINK
0.0356%
71
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$10.77
0.0043585 Eth
$52,315.00
4,895.603 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0266%
72
PointPay
LINK-BTC$10.78
0.0043604 Eth
$52,033.00
4,778.758 LINK
0.0259%
73
KuCoin
LINK-BTC$10.78
0.0043600 Eth
$49,106.00
4,556.174 LINK
0.0247%
74
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$10.77
0.0043581 Eth
$44,282.00
4,122.170 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0224%
75
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$10.76
0.0043528 Eth
$35,287.00
3,249.201 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0176%
76
KuCoin
LINK-USDC$10.79
0.0043658 Eth
$28,956.00
2,683.071 LINK
0.0146%
77
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$10.78
0.0043598 Eth
$26,284.00
26,285.562 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.1427%
78
EXMO
LINK-BTC$10.85
0.0043887 Eth
$21,707.00
2,001.244 LINK
0.0109%
79
Bitso
LINK-USD$10.81
0.0043728 Eth
$21,703.00
2,007.826 LINK
0.0109%
80
Binance US
LINK-USDT$10.79
0.0043600 Eth
$21,446.00
1,987.675 LINK
0.0108%
81
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$10.78
0.0043615 Eth
$19,929.29
1,833.172 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0100%
82
Coinbase Exchange
LINK-ETH$10.79
0.0043660 Eth
$19,205.68
1,779.830 LINK
0.0097%
83
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$10.78
0.0043604 Eth
$19,158.48
1,762.256 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0096%
84
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$10.78
0.0043608 Eth
$16,948.84
1,561.683 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0085%
85
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$10.77
0.0043585 Eth
$15,987.06
15,872.241 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.0862%
86
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$10.77
0.0043565 Eth
$15,305.62
1,421.962 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0077%
87
Pangolin
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$10.85
0.0043893 Eth
$9,719.41
887.297 0X5947BB275C521040051D82396192181B413227A3
0.0048%
88
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$10.77
0.0043581 Eth
$8,806.13
820.151 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0045%
89
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$10.87
0.0043931 Eth
$8,383.41
762.427 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0041%
90
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X55D398326F99059FF775485246999027B3197955$10.80
0.0043703 Eth
$5,890.31
548.949 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0030%
91
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X1BFD67037B42CF73ACF2047067BD4F2C47D9BFD6$10.77
0.0043581 Eth
$5,522.36
508.800 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0028%
92
LFJ
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$10.84
0.0043866 Eth
$5,319.06
486.258 0X5947BB275C521040051D82396192181B413227A3
0.0026%
93
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$10.77
0.0043582 Eth
$4,370.56
405.957 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0022%
94
CoinEx
LINK-USDC$10.82
0.0043761 Eth
$2,415.27
222.827 LINK
0.0012%
95
KuCoin
LINK-KCS$10.80
0.0043674 Eth
$2,320.38
214.927 LINK
0.0012%
96
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X8AC76A51CC950D9822D68B83FE1AD97B32CD580D$10.83
0.0043816 Eth
$808.13
75.316 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0004%
97
PancakeSwap (v2)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X55D398326F99059FF775485246999027B3197955$10.81
0.0043761 Eth
$403.16
31.471 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0002%
98
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X8F3CF7AD23CD3CADBD9735AFF958023239C6A063$10.80
0.0043687 Eth
$400.02
37.125 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0002%
99
Uniswap V3 (Arbitrum One)
0X912CE59144191C1204E64559FE8253A0E49E6548-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$10.77
0.0043584 Eth
$257.76
539.611 0X912CE59144191C1204E64559FE8253A0E49E6548
0.0029%
100
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0XDA10009CBD5D07DD0CECC66161FC93D7C9000DA1$10.79
0.0043665 Eth
$176.60
16.504 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0001%

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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