ETH Price: $2,443.29 (+1.25%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

721,637 ( 0.000%)

Market

Price

$11.03 @ 0.004514 ETH (+2.89%)

Onchain Market Cap

$11,030,000,000.00

Circulating Supply Market Cap

$6,917,300,890.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
0 LINK

Value
$0.00
0x9c1e062720f5ef26bd7814b6f67c9dca61321fc9
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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 9927.27% |ETH 0.0003846 1073.69%

Market

Volume (24H):$321,952,698.00
Market Capitalization:$6,917,300,890.00
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
LBank
LINK-USDT$11.03
0.0045112 Eth
$33,003,128.00
2,992,972.250 LINK
21.0926%
2
Coinbase Exchange
LINK-USD$11.03
0.0045133 Eth
$15,907,868.00
1,441,974.940 LINK
10.1621%
3
HTX
LINK-USDT$11.02
0.0045117 Eth
$9,286,491.00
853,333.364 LINK
6.0137%
4
Bitget
LINK-USDT$11.02
0.0045078 Eth
$8,739,268.00
803,409.217 LINK
5.6619%
5
Websea
LINK-USDT$11.02
0.0045061 Eth
$8,063,222.00
0.000 LINK
0.0000%
6
Bybit
LINK-USDT$11.03
0.0045146 Eth
$7,531,223.00
694,798.624 LINK
4.8965%
7
WhiteBIT
LINK-USDT$11.02
0.0045046 Eth
$5,872,377.00
532,929.790 LINK
3.7557%
8
Azbit
LINK-USDT$11.03
0.0045086 Eth
$5,300,252.00
487,327.110 LINK
3.4344%
9
P2B
LINK-USDT$11.03
0.0045112 Eth
$3,961,082.00
359,220.710 LINK
2.5316%
10
BVOX
LINK-USDT$11.02
0.0045061 Eth
$3,714,732.00
342,416.770 LINK
2.4131%
11
Biconomy.com
LINK-USDT$11.03
0.0045089 Eth
$3,511,348.00
323,247.320 LINK
2.2780%
12
OKX
LINK-USDT$11.03
0.0045132 Eth
$3,480,177.00
322,037.055 LINK
2.2695%
13
Slex
LINK-USDT$11.02
0.0045087 Eth
$3,165,270.00
291,742.830 LINK
2.0560%
14
WEEX
LINK-USDT$11.04
0.0045122 Eth
$3,140,494.00
288,905.650 LINK
2.0360%
15
BTSE
LINK-USDT$11.02
0.0045086 Eth
$3,049,758.00
276,802.506 LINK
1.9507%
16
KuCoin
LINK-USDT$11.03
0.0045116 Eth
$2,737,599.00
248,304.491 LINK
1.7499%
17
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$11.06
0.0045268 Eth
$2,662,338.00
244,140.125 0X514910771AF9CA656AF840DFF83E8264ECF986CA
1.7205%
18
DigiFinex
LINK-USDT$11.03
0.0045130 Eth
$2,519,690.00
228,540.190 LINK
1.6106%
19
FameEX
LINK-USDT$11.02
0.0045107 Eth
$2,265,726.00
208,250.391 LINK
1.4676%
20
Upbit
LINK-KRW$11.06
0.0045262 Eth
$2,066,163.00
186,857.582 LINK
1.3169%
21
HashKey Global
LINK-USDT$11.03
0.0045154 Eth
$2,014,894.00
186,115.231 LINK
1.3116%
22
Trubit
LINK-USDT$11.02
0.0045107 Eth
$1,978,200.00
181,766.080 LINK
1.2810%
23
Deepcoin
LINK-USDT$11.03
0.0045107 Eth
$1,828,252.00
172,666.820 LINK
1.2168%
24
AscendEX (BitMax)
LINK-USDT$11.03
0.0045124 Eth
$1,771,539.00
160,655.100 LINK
1.1322%
25
Gate.io
LINK-USDT$11.03
0.0045143 Eth
$1,661,514.00
153,400.810 LINK
1.0811%
26
XT.COM
LINK-USDT$11.04
0.0045147 Eth
$1,649,361.00
151,993.880 LINK
1.0712%
27
CoinW
LINK-USDT$11.03
0.0045138 Eth
$1,506,835.00
136,641.820 LINK
0.9630%
28
Crypto.com Exchange
LINK-USDT$11.03
0.0045158 Eth
$1,290,181.00
116,947.400 LINK
0.8242%
29
Crypto.com Exchange
LINK-USD$11.03
0.0045162 Eth
$1,245,649.00
112,902.080 LINK
0.7957%
30
C-Patex
LINK-USDT$11.03
0.0045116 Eth
$1,167,768.00
105,892.403 LINK
0.7463%
31
Kraken
LINK-USD$11.02
0.0045120 Eth
$1,069,480.00
97,025.252 LINK
0.6838%
32
Bitvavo
LINK-EUR$11.02
0.0045112 Eth
$974,502.00
88,397.534 LINK
0.6230%
33
BYDFi
LINK-USDT$11.04
0.0045139 Eth
$945,517.00
85,668.040 LINK
0.6037%
34
Azbit
LINK-ETH$11.03
0.0045110 Eth
$938,342.00
86,052.797 LINK
0.6064%
35
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$10.98
0.0044928 Eth
$840,795.00
77,429.990 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.5457%
36
Hotcoin
LINK-USDT$11.02
0.0045087 Eth
$812,710.00
73,762.840 LINK
0.5198%
37
FMCPAY
LINK-USDT$11.03
0.0045081 Eth
$710,796.00
65,395.467 LINK
0.4609%
38
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$11.02
0.0045107 Eth
$701,177.00
64,809.897 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.4567%
39
FMFW.io
LINK-USDT$11.03
0.0045149 Eth
$668,931.00
60,632.320 LINK
0.4273%
40
HitBTC
LINK-USDT$11.03
0.0045144 Eth
$658,959.00
60,618.200 LINK
0.4272%
41
Dex-Trade
LINK-USDT$11.03
0.0045112 Eth
$634,387.00
57,530.961 LINK
0.4054%
42
LATOKEN
LINK-USDT$11.04
0.0045126 Eth
$572,095.00
51,834.972 LINK
0.3653%
43
Bithumb
LINK-KRW$11.04
0.0045199 Eth
$539,110.00
48,820.891 LINK
0.3441%
44
FMCPAY
LINK-BTC$11.02
0.0045103 Eth
$462,309.00
42,228.600 LINK
0.2976%
45
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$11.02
0.0045081 Eth
$449,377.00
41,299.888 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.2911%
46
tanX
LINK-USDC$10.97
0.0044925 Eth
$447,230.00
41,208.940 LINK
0.2904%
47
BigONE
LINK-USDT$11.02
0.0045040 Eth
$410,442.00
37,257.380 LINK
0.2626%
48
WhiteBIT
LINK-BTC$11.04
0.0045125 Eth
$395,229.00
35,805.280 LINK
0.2523%
49
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$10.98
0.0044933 Eth
$343,670.00
31,779.851 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.2240%
50
FMCPAY
LINK-ETH$11.02
0.0045124 Eth
$319,720.00
29,395.520 LINK
0.2072%
51
CoinEx
LINK-USDT$11.03
0.0045129 Eth
$315,838.00
29,024.953 LINK
0.2045%
52
PointPay
LINK-USDT$11.02
0.0045087 Eth
$299,967.00
27,629.551 LINK
0.1947%
53
EXMO
LINK-USDT$11.02
0.0045123 Eth
$245,740.00
22,291.150 LINK
0.1571%
54
LATOKEN
LINK-BTC$11.04
0.0045148 Eth
$239,179.00
21,660.404 LINK
0.1526%
55
Bit2Me
LINK-EUR$11.03
0.0045090 Eth
$211,142.00
19,229.993 LINK
0.1355%
56
Bybit
LINK-USDC$11.02
0.0045122 Eth
$201,225.00
18,554.582 LINK
0.1308%
57
BitMart
LINK-BTC$11.03
0.0045156 Eth
$181,808.00
16,480.900 LINK
0.1161%
58
Gemini
LINK-USD$10.99
0.0044966 Eth
$156,241.00
14,223.001 LINK
0.1002%
59
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$11.03
0.0045149 Eth
$146,119.00
13,437.669 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0947%
60
Hotcoin
LINK-ETH$11.03
0.0045151 Eth
$123,218.00
11,167.470 LINK
0.0787%
61
BYDFi
LINK-USDC$11.01
0.0045045 Eth
$107,337.00
9,748.920 LINK
0.0687%
62
BitDelta
LINK-USDT$11.03
0.0045081 Eth
$105,139.00
9,671.000 LINK
0.0682%
63
Bitci TR
LINK-TRY$11.02
0.0045108 Eth
$104,380.00
9,580.302 LINK
0.0675%
64
Hotcoin
LINK-BTC$11.02
0.0045115 Eth
$103,364.00
9,375.530 LINK
0.0661%
65
OKX
LINK-USDC$11.03
0.0045123 Eth
$92,108.00
8,514.327 LINK
0.0600%
66
Slex
LINK-ETH$11.04
0.0045181 Eth
$84,852.00
7,793.640 LINK
0.0549%
67
Binance
LINK-TRY$11.06
0.0045275 Eth
$80,247.00
7,385.750 LINK
0.0521%
68
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$11.00
0.0045013 Eth
$77,425.00
7,086.105 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0499%
69
Slex
LINK-BTC$11.04
0.0045167 Eth
$74,859.00
6,827.400 LINK
0.0481%
70
Bitkub
LINK-THB$11.05
0.0045203 Eth
$67,988.00
6,153.254 LINK
0.0434%
71
Bitget
LINK-EUR$11.06
0.0045278 Eth
$46,659.00
4,281.780 LINK
0.0302%
72
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$11.03
0.0045149 Eth
$44,498.00
4,113.032 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0290%
73
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$11.03
0.0045149 Eth
$40,371.00
39,817.872 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.2806%
74
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$10.98
0.0044929 Eth
$34,781.00
34,230.430 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.2412%
75
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$11.03
0.0045130 Eth
$28,547.00
2,624.683 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0185%
76
CoinEx
LINK-USDC$11.00
0.0045036 Eth
$24,176.00
2,182.334 LINK
0.0154%
77
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$11.03
0.0045139 Eth
$23,744.00
2,180.643 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0154%
78
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$10.99
0.0044939 Eth
$20,173.00
1,867.306 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0132%
79
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$11.02
0.0045099 Eth
$18,735.78
18,454.908 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.1301%
80
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$11.02
0.0045093 Eth
$17,993.26
1,660.388 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0117%
81
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$10.98
0.0044933 Eth
$17,727.75
1,639.123 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0116%
82
Mercado Bitcoin
LINK-BRL$11.03
0.0045152 Eth
$17,726.49
1,606.665 LINK
0.0113%
83
Binance US
LINK-USDT$11.01
0.0045048 Eth
$14,455.87
1,313.560 LINK
0.0093%
84
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$10.98
0.0044933 Eth
$11,523.57
11,276.974 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.0795%
85
Coinone
LINK-KRW$10.99
0.0044989 Eth
$11,008.86
1,001.650 LINK
0.0071%
86
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$10.97
0.0044884 Eth
$8,307.33
764.586 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0054%
87
THENA FUSION
0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$11.00
0.0044977 Eth
$5,613.25
8.892 0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827
0.0001%
88
CoinEx
LINK-BTC$11.05
0.0045239 Eth
$3,906.06
355.845 LINK
0.0025%
89
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X1BFD67037B42CF73ACF2047067BD4F2C47D9BFD6$11.05
0.0045219 Eth
$3,356.90
306.373 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0022%
90
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$11.00
0.0044979 Eth
$3,163.34
290.754 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0020%
91
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X55D398326F99059FF775485246999027B3197955$11.03
0.0045078 Eth
$2,258.45
206.904 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0015%
92
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$11.02
0.0045093 Eth
$1,425.47
131.556 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0009%
93
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$11.02
0.0045083 Eth
$1,136.44
104.592 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0007%
94
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X61299774020DA444AF134C82FA83E3810B309991$11.03
0.0045131 Eth
$1,122.43
101.308 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0007%
95
PancakeSwap (v2)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X55D398326F99059FF775485246999027B3197955$11.00
0.0044970 Eth
$757.95
49.359 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0003%
96
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$11.01
0.0045063 Eth
$702.52
64.950 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0005%
97
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X55D398326F99059FF775485246999027B3197955$11.01
0.0045033 Eth
$389.16
35.909 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0003%
98
CEX.IO
LINK-USDT$11.03
0.0045132 Eth
$280.88
25.714 LINK
0.0002%
99
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XB33EAAD8D922B1083446DC23F610C2567FB5180F$11.00
0.0044979 Eth
$174.09
16.306 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0001%
100
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X8F3CF7AD23CD3CADBD9735AFF958023239C6A063$11.00
0.0045000 Eth
$102.55
9.467 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
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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