ETH Price: $2,393.75 (-3.84%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

721,175 ( 0.001%)

Market

Price

$10.77 @ 0.004499 ETH (-4.00%)

Onchain Market Cap

$10,770,000,000.00

Circulating Supply Market Cap

$6,753,330,222.00

Other Info

Token Contract (WITH 18 Decimals)

Filtered by Token Holder
kirbyongeo.eth
Balance
0 LINK

Value
$0.00
0x6cd68e8f04490cd1a5a21cc97cc8bc15b47dc9eb
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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 9690.91% |ETH 0.0003846 1069.79%

Market

Volume (24H):$517,061,043.00
Market Capitalization:$6,753,330,222.00
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$10.77
0.0044962 Eth
$33,930,387.00
3,137,008.960 LINK
20.5076%
2
Coinbase Exchange
LINK-USD$10.78
0.0045051 Eth
$20,549,319.00
1,906,952.350 LINK
12.4663%
3
HTX
LINK-USDT$10.77
0.0045027 Eth
$14,953,449.00
1,367,790.953 LINK
8.9417%
4
Bitget
LINK-USDT$10.79
0.0045035 Eth
$9,856,932.00
907,690.967 LINK
5.9338%
5
P2B
LINK-USDT$10.77
0.0045010 Eth
$6,713,325.00
623,395.550 LINK
4.0753%
6
Slex
LINK-USDT$10.76
0.0044967 Eth
$6,430,348.00
590,034.840 LINK
3.8572%
7
OKX
LINK-USDT$10.79
0.0045053 Eth
$5,952,632.00
548,906.011 LINK
3.5884%
8
Azbit
LINK-USDT$10.76
0.0045002 Eth
$5,301,535.00
486,513.242 LINK
3.1805%
9
DigiFinex
LINK-USDT$10.79
0.0045074 Eth
$4,427,617.00
410,162.710 LINK
2.6814%
10
Biconomy.com
LINK-USDT$10.77
0.0045036 Eth
$4,340,194.00
398,693.920 LINK
2.6064%
11
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$10.72
0.0044826 Eth
$4,257,382.00
399,413.192 0X514910771AF9CA656AF840DFF83E8264ECF986CA
2.6111%
12
KuCoin
LINK-USDT$10.79
0.0045046 Eth
$4,029,829.00
373,600.824 LINK
2.4423%
13
XT.COM
LINK-USDT$10.77
0.0045009 Eth
$3,199,774.00
295,840.040 LINK
1.9340%
14
ProBit Global
LINK-USDT$10.77
0.0045045 Eth
$2,767,725.00
256,868.393 LINK
1.6792%
15
CoinW
LINK-USDT$10.76
0.0045002 Eth
$2,667,487.00
247,804.030 LINK
1.6200%
16
Coinstore
LINK-USDT$10.78
0.0045057 Eth
$2,086,090.00
192,517.720 LINK
1.2585%
17
Kraken
LINK-USD$10.77
0.0044987 Eth
$1,941,783.00
180,256.360 LINK
1.1784%
18
Trubit
LINK-USDT$10.76
0.0044999 Eth
$1,766,844.00
163,459.740 LINK
1.0686%
19
AscendEX (BitMax)
LINK-USDT$10.81
0.0045152 Eth
$1,673,413.00
154,753.400 LINK
1.0117%
20
Bitunix
LINK-USDT$10.78
0.0045082 Eth
$1,654,183.00
153,500.130 LINK
1.0035%
21
BYDFi
LINK-USDT$10.77
0.0045021 Eth
$1,621,655.00
150,585.840 LINK
0.9844%
22
WhiteBIT
LINK-BTC$10.77
0.0044994 Eth
$1,483,053.00
137,765.130 LINK
0.9006%
23
FameEX
LINK-USDT$10.76
0.0044996 Eth
$1,355,658.00
125,311.490 LINK
0.8192%
24
BTSE
LINK-USDT$10.77
0.0045010 Eth
$1,253,934.00
116,440.715 LINK
0.7612%
25
Dex-Trade
LINK-USDT$10.80
0.0045090 Eth
$1,122,777.00
103,989.080 LINK
0.6798%
26
FMCPAY
LINK-USDT$10.76
0.0044979 Eth
$1,002,774.00
92,259.684 LINK
0.6031%
27
Azbit
LINK-ETH$10.77
0.0045031 Eth
$896,056.00
83,611.212 LINK
0.5466%
28
Bitexen
LINK-USDT$10.78
0.0045084 Eth
$856,466.00
79,421.140 LINK
0.5192%
29
Bitvavo
LINK-EUR$10.76
0.0044939 Eth
$849,267.00
78,911.039 LINK
0.5159%
30
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$10.76
0.0044912 Eth
$805,285.00
75,555.567 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.4939%
31
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$10.78
0.0045047 Eth
$780,068.00
71,768.744 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.4692%
32
Bitexen
LINK-TRY$10.80
0.0045154 Eth
$685,434.00
63,461.820 LINK
0.4149%
33
WhiteBIT
LINK-EUR$10.74
0.0044886 Eth
$624,441.00
58,146.160 LINK
0.3801%
34
FMCPAY
LINK-BTC$10.77
0.0045010 Eth
$601,939.00
55,261.700 LINK
0.3613%
35
tanX
LINK-USDC$10.78
0.0045054 Eth
$585,856.00
53,602.950 LINK
0.3504%
36
PointPay
LINK-USDT$10.77
0.0045017 Eth
$566,886.00
52,401.662 LINK
0.3426%
37
BigONE
LINK-USDT$10.79
0.0045096 Eth
$533,306.00
49,438.620 LINK
0.3232%
38
FMCPAY
LINK-ETH$10.76
0.0044999 Eth
$528,520.00
49,336.480 LINK
0.3225%
39
AscendEX (BitMax)
LINK-BTC$10.72
0.0044769 Eth
$506,677.00
47,257.300 LINK
0.3089%
40
LATOKEN
LINK-USDT$10.78
0.0045007 Eth
$476,312.00
44,196.873 LINK
0.2889%
41
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$10.79
0.0045121 Eth
$466,848.00
43,622.026 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.2852%
42
ProBit Global
LINK-BTC$10.77
0.0045034 Eth
$414,065.00
38,438.088 LINK
0.2513%
43
EXMO
LINK-USDT$10.79
0.0045059 Eth
$403,911.00
37,435.028 LINK
0.2447%
44
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$10.78
0.0045052 Eth
$400,749.00
37,428.400 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.2447%
45
CoinEx
LINK-USDT$10.79
0.0045055 Eth
$395,845.00
36,198.487 LINK
0.2366%
46
Bybit
LINK-USDC$10.78
0.0045016 Eth
$388,558.00
35,946.427 LINK
0.2350%
47
Phemex
LINK-USDT$10.77
0.0045019 Eth
$367,800.00
34,154.740 LINK
0.2233%
48
EarnBIT
LINK-USDT$10.77
0.0045036 Eth
$287,906.00
26,554.138 LINK
0.1736%
49
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$10.74
0.0044909 Eth
$251,882.00
23,632.521 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.1545%
50
Coinbase Exchange
LINK-EUR$10.78
0.0045017 Eth
$225,066.00
20,875.970 LINK
0.1365%
51
Binance
LINK-EUR$10.77
0.0045028 Eth
$219,499.00
20,221.880 LINK
0.1322%
52
LATOKEN
LINK-BTC$10.77
0.0044975 Eth
$215,948.00
20,051.950 LINK
0.1311%
53
OKX
LINK-USDC$10.81
0.0045144 Eth
$199,742.00
18,440.172 LINK
0.1205%
54
BitDelta
LINK-USDT$10.79
0.0045045 Eth
$176,157.00
16,189.000 LINK
0.1058%
55
Binance
LINK-BRL$10.83
0.0045219 Eth
$167,905.00
15,678.720 LINK
0.1025%
56
BitMart
LINK-BTC$10.77
0.0045013 Eth
$167,152.00
15,519.640 LINK
0.1015%
57
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$10.79
0.0045050 Eth
$161,063.00
14,797.248 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0967%
58
Bitbank
LINK-JPY$10.81
0.0045143 Eth
$157,382.00
14,557.003 LINK
0.0952%
59
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$10.80
0.0045143 Eth
$154,719.00
14,318.863 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0936%
60
BYDFi
LINK-USDC$10.78
0.0045017 Eth
$144,670.00
13,418.920 LINK
0.0877%
61
Coinbase Exchange
LINK-GBP$10.80
0.0045092 Eth
$132,882.00
12,305.040 LINK
0.0804%
62
Binance
LINK-TRY$10.80
0.0045114 Eth
$110,815.00
10,195.150 LINK
0.0666%
63
Bitci TR
LINK-TRY$10.87
0.0045424 Eth
$109,263.00
9,997.410 LINK
0.0654%
64
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$10.81
0.0045175 Eth
$102,774.00
103,109.333 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.6741%
65
Slex
LINK-BTC$10.78
0.0045051 Eth
$101,385.00
9,354.700 LINK
0.0612%
66
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$10.74
0.0044912 Eth
$100,290.00
101,128.549 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.6611%
67
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$10.81
0.0045175 Eth
$96,638.00
8,913.577 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0583%
68
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$10.78
0.0045053 Eth
$80,661.00
7,567.353 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0495%
69
WhiteBIT
LINK-TRY$10.82
0.0045233 Eth
$80,345.00
7,424.140 LINK
0.0485%
70
GMO Japan
LINK-JPY$10.82
0.0045235 Eth
$78,323.00
7,238.500 LINK
0.0473%
71
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$10.76
0.0044952 Eth
$76,980.00
7,298.517 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0477%
72
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$10.76
0.0044994 Eth
$71,765.00
6,608.159 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0432%
73
PointPay
LINK-BTC$10.77
0.0044972 Eth
$69,373.00
6,392.461 LINK
0.0418%
74
Coinbase Exchange
LINK-ETH$10.72
0.0044819 Eth
$65,539.00
6,113.250 LINK
0.0400%
75
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$10.70
0.0044682 Eth
$61,696.00
5,710.433 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0373%
76
Bitget
LINK-EUR$10.81
0.0045127 Eth
$60,222.00
5,532.860 LINK
0.0362%
77
Slex
LINK-ETH$10.76
0.0044972 Eth
$57,407.00
5,368.620 LINK
0.0351%
78
LATOKEN
LINK-ETH$10.79
0.0045042 Eth
$52,224.00
4,842.060 LINK
0.0317%
79
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$10.79
0.0045105 Eth
$51,244.00
4,728.887 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0309%
80
BTCMarkets
LINK-AUD$10.67
0.0044591 Eth
$42,974.00
4,028.688 LINK
0.0263%
81
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$10.68
0.0044604 Eth
$41,376.00
3,909.698 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0256%
82
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$10.79
0.0045038 Eth
$41,072.00
41,244.611 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.2696%
83
EXMO
LINK-BTC$10.77
0.0044975 Eth
$38,112.00
3,538.929 LINK
0.0231%
84
Foxbit
LINK-BRL$10.80
0.0045145 Eth
$35,190.00
3,251.413 LINK
0.0213%
85
Mercado Bitcoin
LINK-BRL$10.84
0.0045274 Eth
$33,407.00
3,081.008 LINK
0.0201%
86
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$10.69
0.0044647 Eth
$32,285.00
2,993.842 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0196%
87
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X1BFD67037B42CF73ACF2047067BD4F2C47D9BFD6$10.79
0.0045107 Eth
$20,734.00
1,907.590 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0125%
88
Binance US
LINK-USDT$10.76
0.0044919 Eth
$17,581.99
1,634.352 LINK
0.0107%
89
KuCoin
LINK-KCS$10.76
0.0044956 Eth
$13,960.71
1,296.879 LINK
0.0085%
90
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$10.76
0.0044912 Eth
$13,196.47
13,314.983 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.0870%
91
Pangolin
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$10.82
0.0045196 Eth
$11,458.06
1,085.259 0X5947BB275C521040051D82396192181B413227A3
0.0071%
92
LFJ
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$10.81
0.0045155 Eth
$10,103.51
969.851 0X5947BB275C521040051D82396192181B413227A3
0.0063%
93
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X55D398326F99059FF775485246999027B3197955$10.78
0.0045058 Eth
$8,169.83
752.184 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0049%
94
Ramses V2
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$10.74
0.0044889 Eth
$5,897.38
552.069 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0036%
95
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$10.73
0.0044858 Eth
$4,857.51
455.127 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0030%
96
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XDAC17F958D2EE523A2206206994597C13D831EC7$10.74
0.0044886 Eth
$4,856.64
452.663 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0030%
97
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$10.78
0.0045078 Eth
$3,947.60
365.128 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0024%
98
PancakeSwap V3 (Arbitrum)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$10.74
0.0044888 Eth
$3,106.73
291.660 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0019%
99
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$10.79
0.0045111 Eth
$2,807.98
259.012 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0017%
100
CoinEx
LINK-BTC$10.82
0.0045169 Eth
$2,734.28
252.245 LINK
0.0016%

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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