ETH Price: $3,665.01 (+0.67%)
Gas: 6.67 Gwei
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

729,727 (0.00%)

Market

Price

$23.80 @ 0.006494 ETH (+2.03%)

Onchain Market Cap

$23,800,000,000.00

Circulating Supply Market Cap

$14,970,176,334.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
500 LINK

Value
$11,900.00 ( ~3.2469 Eth) [0.0001%]
0x151388fc9d85788a4139350218bcf27698b409b5
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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 21536.36% |ETH 0.0003846 1588.51%

Market

Volume (24H):$715,480,948.00
Market Capitalization:$14,970,176,334.00
Circulating Supply:631,099,972.00 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$23.75
0.0064819 Eth
$65,199,493.00
2,793,851.330 LINK
23.2905%
2
Coinbase Exchange
LINK-USD$23.81
0.0064981 Eth
$27,378,495.00
1,149,728.920 LINK
9.5845%
3
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$23.92
0.0065206 Eth
$17,737,627.00
749,828.900 0X514910771AF9CA656AF840DFF83E8264ECF986CA
6.2508%
4
MEXC
LINK-USDT$23.82
0.0064992 Eth
$17,237,926.00
723,650.540 LINK
6.0326%
5
Bybit
LINK-USDT$23.75
0.0064761 Eth
$16,876,645.00
723,018.358 LINK
6.0273%
6
WEEX
LINK-USDT$23.66
0.0064742 Eth
$16,231,254.00
695,907.420 LINK
5.8013%
7
P2B
LINK-USDT$23.85
0.0064884 Eth
$13,327,241.00
558,754.070 LINK
4.6580%
8
CoinW
LINK-USDT$23.85
0.0064886 Eth
$11,904,467.00
499,088.590 LINK
4.1606%
9
OKX
LINK-USDT$23.79
0.0064868 Eth
$10,613,927.00
454,372.096 LINK
3.7878%
10
HTX
LINK-USDT$23.79
0.0064856 Eth
$7,664,807.00
328,184.686 LINK
2.7359%
11
XT.COM
LINK-USDT$23.79
0.0064910 Eth
$6,641,613.00
284,455.650 LINK
2.3713%
12
Azbit
LINK-USDT$23.83
0.0064991 Eth
$6,608,108.00
283,225.123 LINK
2.3611%
13
Coinstore
LINK-USDT$23.78
0.0064838 Eth
$6,132,996.00
262,891.470 LINK
2.1916%
14
Bithumb
LINK-KRW$23.87
0.0065079 Eth
$4,857,804.00
203,491.032 LINK
1.6964%
15
BYDFi
LINK-USDT$23.85
0.0065108 Eth
$4,355,316.00
182,597.690 LINK
1.5222%
16
BTSE
LINK-USDT$23.79
0.0064924 Eth
$3,358,003.00
141,126.075 LINK
1.1765%
17
LATOKEN
LINK-USDT$23.81
0.0064909 Eth
$3,240,041.00
136,079.890 LINK
1.1344%
18
Hotcoin
LINK-USDT$23.82
0.0064896 Eth
$2,447,565.00
102,767.140 LINK
0.8567%
19
Dex-Trade
LINK-USDT$23.77
0.0064851 Eth
$2,166,904.00
91,160.820 LINK
0.7599%
20
Bitvavo
LINK-EUR$23.85
0.0065089 Eth
$2,134,700.00
89,486.715 LINK
0.7460%
21
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$23.86
0.0065114 Eth
$2,025,479.00
85,767.250 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.7150%
22
Dcoin
LINK-USDT$23.80
0.0064933 Eth
$1,932,377.00
81,192.000 LINK
0.6768%
23
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$23.78
0.0064882 Eth
$1,786,866.00
75,814.414 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.6320%
24
CoinEx
LINK-USDT$23.82
0.0065100 Eth
$1,690,528.00
72,554.189 LINK
0.6048%
25
KuCoin
LINK-USDT$23.75
0.0064760 Eth
$1,593,490.00
67,094.916 LINK
0.5593%
26
tanX
LINK-USDC$23.81
0.0064976 Eth
$1,182,159.00
50,616.770 LINK
0.4220%
27
PointPay
LINK-USDT$23.79
0.0064906 Eth
$1,071,362.00
45,920.896 LINK
0.3828%
28
EXMO
LINK-USDT$23.81
0.0064970 Eth
$953,286.00
40,035.072 LINK
0.3337%
29
Coinbase Exchange
LINK-EUR$23.79
0.0064918 Eth
$924,481.00
38,854.390 LINK
0.3239%
30
Trubit
LINK-USDT$23.77
0.0064861 Eth
$923,152.00
39,591.200 LINK
0.3300%
31
Gemini
LINK-USD$23.75
0.0064774 Eth
$897,117.00
37,765.601 LINK
0.3148%
32
WhiteBIT
LINK-TRY$23.91
0.0065181 Eth
$840,319.00
35,145.590 LINK
0.2930%
33
Bybit
LINK-USDC$23.80
0.0064893 Eth
$784,531.00
33,577.130 LINK
0.2799%
34
WhiteBIT
LINK-BTC$23.80
0.0064888 Eth
$780,640.00
32,796.780 LINK
0.2734%
35
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$23.85
0.0065082 Eth
$754,984.00
31,997.250 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.2667%
36
Bitstamp
LINK-EUR$23.79
0.0064879 Eth
$646,568.00
27,174.185 LINK
0.2265%
37
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$23.92
0.0065206 Eth
$625,221.00
40,480.593 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.3375%
38
Bitbank
LINK-JPY$23.80
0.0064947 Eth
$563,929.00
23,693.988 LINK
0.1975%
39
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$23.92
0.0065206 Eth
$542,662.00
22,930.499 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.1912%
40
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$23.81
0.0064970 Eth
$513,726.00
21,708.448 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1810%
41
EarnBIT
LINK-USDT$23.81
0.0064957 Eth
$513,132.00
21,964.999 LINK
0.1831%
42
Bitstamp
LINK-USD$23.80
0.0064897 Eth
$453,657.00
19,061.236 LINK
0.1589%
43
Bitbegin
LINK-USDT$23.61
0.0064758 Eth
$427,313.00
18,320.521 LINK
0.1527%
44
BigONE
LINK-USDT$23.81
0.0065103 Eth
$424,465.00
17,824.040 LINK
0.1486%
45
Coinbase Exchange
LINK-GBP$23.79
0.0064917 Eth
$379,465.00
15,948.420 LINK
0.1330%
46
HashKey Exchange
LINK-USD$23.85
0.0065037 Eth
$344,542.00
14,776.866 LINK
0.1232%
47
Coinbase Exchange
LINK-ETH$23.79
0.0064917 Eth
$322,574.00
13,557.350 LINK
0.1130%
48
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$23.85
0.0065082 Eth
$300,610.00
294,564.090 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
2.4556%
49
Slex
LINK-ETH$23.92
0.0065170 Eth
$294,724.00
12,474.080 LINK
0.1040%
50
Coinbase Exchange
LINK-BTC$23.80
0.0064867 Eth
$283,777.00
11,925.370 LINK
0.0994%
51
BitMart
LINK-BTC$23.78
0.0064877 Eth
$268,461.00
11,290.120 LINK
0.0941%
52
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$23.86
0.0065098 Eth
$262,635.00
11,253.199 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0938%
53
OKX
LINK-USDC$23.81
0.0064914 Eth
$250,264.00
10,720.480 LINK
0.0894%
54
GMO Japan
LINK-JPY$23.78
0.0064901 Eth
$244,916.00
10,300.800 LINK
0.0859%
55
Bitci TR
LINK-TRY$23.77
0.0064782 Eth
$240,707.00
10,294.260 LINK
0.0858%
56
Coinone
LINK-KRW$23.88
0.0065113 Eth
$179,751.00
7,527.526 LINK
0.0628%
57
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$23.90
0.0065216 Eth
$140,238.00
5,931.865 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0495%
58
LATOKEN
LINK-BTC$23.67
0.0064767 Eth
$108,803.00
4,596.769 LINK
0.0383%
59
Bitkub
LINK-THB$23.75
0.0064788 Eth
$99,722.00
4,199.522 LINK
0.0350%
60
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$23.90
0.0065200 Eth
$96,132.00
4,058.925 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0338%
61
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$23.80
0.0064951 Eth
$95,582.00
4,049.754 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0338%
62
BitStorage
LINK-ETH$23.85
0.0065000 Eth
$94,507.00
3,961.760 LINK
0.0330%
63
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$23.81
0.0064973 Eth
$91,678.00
3,881.406 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0324%
64
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$23.90
0.0065199 Eth
$89,724.00
3,841.804 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0320%
65
BitMart
LINK-ETH$23.82
0.0064980 Eth
$87,071.00
3,655.960 LINK
0.0305%
66
Nonkyc.io
LINK-BTC$23.92
0.0065204 Eth
$77,021.00
3,275.927 LINK
0.0273%
67
Hotcoin
LINK-BTC$23.75
0.0064733 Eth
$75,922.00
3,196.090 LINK
0.0266%
68
EXMO
LINK-BTC$23.84
0.0065056 Eth
$65,355.00
2,741.132 LINK
0.0229%
69
Gemini
LINK-BTC$23.88
0.0065127 Eth
$62,163.00
2,602.664 LINK
0.0217%
70
BTCMarkets
LINK-AUD$23.80
0.0064713 Eth
$58,986.00
2,478.861 LINK
0.0207%
71
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$23.82
0.0065007 Eth
$55,125.00
54,036.166 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.4505%
72
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$23.83
0.0065024 Eth
$53,736.00
2,285.733 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0191%
73
KuCoin
LINK-BTC$23.77
0.0064823 Eth
$50,822.00
2,137.835 LINK
0.0178%
74
THENA FUSION
0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$23.85
0.0065062 Eth
$37,348.00
47.391 0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827
0.0004%
75
Bitexen
LINK-TRY$23.60
0.0064310 Eth
$32,692.00
1,385.265 LINK
0.0115%
76
CoinEx
LINK-USDC$23.83
0.0065038 Eth
$31,166.00
1,372.147 LINK
0.0114%
77
Hotcoin
LINK-ETH$23.83
0.0065024 Eth
$29,092.00
1,220.640 LINK
0.0102%
78
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$23.82
0.0064981 Eth
$27,536.00
1,216.598 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0101%
79
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$23.89
0.0065180 Eth
$22,312.00
955.776 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0080%
80
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XDAC17F958D2EE523A2206206994597C13D831EC7$23.92
0.0065206 Eth
$18,239.90
776.915 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0065%
81
Korbit
LINK-KRW$23.99
0.0065429 Eth
$16,992.89
730.190 LINK
0.0061%
82
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X1BFD67037B42CF73ACF2047067BD4F2C47D9BFD6$23.84
0.0065039 Eth
$13,743.36
583.590 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0049%
83
Dex-Trade
LINK-ETH$23.90
0.0065204 Eth
$13,387.37
560.150 LINK
0.0047%
84
Uniswap V3 (Avalanche)
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$23.86
0.0065094 Eth
$12,692.72
521.823 0X5947BB275C521040051D82396192181B413227A3
0.0044%
85
LFJ
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$23.94
0.0065317 Eth
$10,841.66
450.190 0X5947BB275C521040051D82396192181B413227A3
0.0038%
86
KuCoin
LINK-KCS$23.80
0.0064910 Eth
$10,731.46
450.815 LINK
0.0038%
87
Biswap V3
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$23.90
0.0065206 Eth
$9,167.81
389.036 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0032%
88
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X55D398326F99059FF775485246999027B3197955$23.77
0.0064860 Eth
$7,356.66
314.810 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0026%
89
Binance US
LINK-BTC$23.70
0.0064678 Eth
$7,051.24
297.500 LINK
0.0025%
90
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$23.92
0.0065192 Eth
$6,140.14
6,004.377 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.0501%
91
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$23.86
0.0065122 Eth
$6,102.31
5,969.345 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.0498%
92
Ace
LINK-USDT$23.82
0.0064937 Eth
$2,583.65
110.620 LINK
0.0009%
93
CoinEx
LINK-BTC$23.79
0.0064861 Eth
$2,390.13
101.640 LINK
0.0008%
94
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XD6DF932A45C0F255F85145F286EA0B292B21C90B$23.82
0.0065070 Eth
$2,319.71
98.989 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0008%
95
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFA7F8980B0F1E64A2062791CC3B0871572F1F7F0$23.86
0.0065114 Eth
$1,958.28
82.793 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0007%
96
Uniswap V3 (Optimism)
0X0B2C639C533813F4AA9D7837CAF62653D097FF85-0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6$23.88
0.0065146 Eth
$842.00
824.653 0X0B2C639C533813F4AA9D7837CAF62653D097FF85
0.0069%
97
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFF970A61A04B1CA14834A43F5DE4533EBDDB5CC8$23.87
0.0065077 Eth
$659.44
28.127 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0002%
98
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X8AC76A51CC950D9822D68B83FE1AD97B32CD580D$23.53
0.0064338 Eth
$654.81
28.120 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0002%
99
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$23.81
0.0065060 Eth
$400.37
17.063 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0001%
100
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0XDA10009CBD5D07DD0CECC66161FC93D7C9000DA1$23.70
0.0064508 Eth
$282.16
12.060 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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