ETH Price: $3,324.02 (+1.53%)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

730,365 (0.00%)

Market

Price

$25.10 @ 0.007551 ETH (+0.58%)

Onchain Market Cap

$25,100,000,000.00

Circulating Supply Market Cap

$16,001,283,882.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
0 LINK

Value
$0.00
0x2e2e400f495803fcb6a474aaeb786bf6f5327382
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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 22718.18% |ETH 0.0003846 1863.34%

Market

Volume (24H):$560,163,217.00
Market Capitalization:$16,001,283,882.00
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$25.13
0.0075556 Eth
$68,455,928.00
2,735,621.810 LINK
22.2805%
2
Coinbase Exchange
LINK-USD$25.06
0.0075480 Eth
$32,747,922.00
1,306,989.210 LINK
10.6449%
3
Slex
LINK-USDT$25.05
0.0075446 Eth
$25,426,197.00
1,016,042.420 LINK
8.2752%
4
Bybit
LINK-USDT$25.08
0.0075550 Eth
$21,247,830.00
849,074.308 LINK
6.9153%
5
P2B
LINK-USDT$25.02
0.0075371 Eth
$14,326,339.00
572,634.280 LINK
4.6639%
6
HTX
LINK-USDT$25.08
0.0075499 Eth
$13,518,279.00
540,037.062 LINK
4.3984%
7
OKX
LINK-USDT$25.10
0.0075586 Eth
$11,390,531.00
455,322.363 LINK
3.7084%
8
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$25.19
0.0075872 Eth
$8,014,252.00
318,109.659 0X514910771AF9CA656AF840DFF83E8264ECF986CA
2.5909%
9
Binance
LINK-FDUSD$25.05
0.0075447 Eth
$6,961,216.00
278,397.990 LINK
2.2674%
10
XT.COM
LINK-USDT$25.02
0.0075371 Eth
$6,808,028.00
271,980.050 LINK
2.2152%
11
Azbit
LINK-USDT$25.06
0.0075445 Eth
$6,792,174.00
271,308.948 LINK
2.2097%
12
KuCoin
LINK-USDT$25.02
0.0075376 Eth
$6,677,769.00
266,850.625 LINK
2.1734%
13
Coinstore
LINK-USDT$25.07
0.0075489 Eth
$6,067,881.00
242,575.800 LINK
1.9757%
14
Bitunix
LINK-USDT$25.07
0.0075473 Eth
$5,458,409.00
217,712.650 LINK
1.7732%
15
WhiteBIT
LINK-USDT$25.01
0.0075322 Eth
$5,067,411.00
202,627.630 LINK
1.6503%
16
CoinW
LINK-USDT$25.06
0.0075448 Eth
$4,249,359.00
169,591.300 LINK
1.3812%
17
BYDFi
LINK-USDT$25.10
0.0075572 Eth
$3,868,578.00
154,151.720 LINK
1.2555%
18
BTSE
LINK-USDT$25.03
0.0075388 Eth
$3,792,447.00
151,543.694 LINK
1.2343%
19
LATOKEN
LINK-USDT$25.04
0.0075397 Eth
$3,177,509.00
126,916.237 LINK
1.0337%
20
Kraken
LINK-USD$25.03
0.0075369 Eth
$2,999,098.00
119,811.042 LINK
0.9758%
21
FMCPAY
LINK-USDT$25.11
0.0075602 Eth
$2,981,642.00
119,185.834 LINK
0.9707%
22
Coinbase Exchange
LINK-EUR$25.09
0.0075585 Eth
$2,841,907.00
113,266.340 LINK
0.9225%
23
QMall
LINK-USDT$25.04
0.0075435 Eth
$2,619,024.00
104,617.454 LINK
0.8521%
24
Hotcoin
LINK-USDT$25.03
0.0075386 Eth
$2,406,428.00
96,150.010 LINK
0.7831%
25
Dex-Trade
LINK-USDT$25.08
0.0075536 Eth
$2,203,791.00
87,878.970 LINK
0.7157%
26
Bitvavo
LINK-EUR$25.11
0.0075652 Eth
$1,984,115.00
79,012.260 LINK
0.6435%
27
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$25.10
0.0075600 Eth
$1,574,168.00
62,968.873 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.5129%
28
FMCPAY
LINK-ETH$25.05
0.0075432 Eth
$1,562,520.00
62,305.600 LINK
0.5075%
29
FMCPAY
LINK-BTC$25.06
0.0075537 Eth
$1,329,684.00
53,176.700 LINK
0.4331%
30
Coinbase Exchange
LINK-GBP$25.07
0.0075523 Eth
$1,289,504.00
51,438.420 LINK
0.4189%
31
WhiteBIT
LINK-BTC$25.10
0.0075587 Eth
$1,242,794.00
49,520.980 LINK
0.4033%
32
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$25.01
0.0075353 Eth
$1,235,670.00
49,440.648 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.4027%
33
WhiteBIT
LINK-TRY$25.12
0.0075649 Eth
$1,020,556.00
40,623.840 LINK
0.3309%
34
CoinEx
LINK-USDT$25.01
0.0075332 Eth
$979,556.00
39,171.242 LINK
0.3190%
35
tanX
LINK-USDC$25.07
0.0075510 Eth
$906,891.00
36,238.320 LINK
0.2951%
36
PointPay
LINK-USDT$25.07
0.0075488 Eth
$819,222.00
32,696.134 LINK
0.2663%
37
Phemex
LINK-USDT$25.06
0.0075535 Eth
$756,860.00
30,206.880 LINK
0.2460%
38
EXMO
LINK-USDT$25.10
0.0075626 Eth
$755,497.00
30,094.484 LINK
0.2451%
39
Trubit
LINK-USDT$25.05
0.0075472 Eth
$728,978.00
29,142.270 LINK
0.2374%
40
OKX
LINK-USDC$25.01
0.0075335 Eth
$691,663.00
27,566.998 LINK
0.2245%
41
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$25.06
0.0075498 Eth
$604,893.00
24,160.034 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.1968%
42
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$25.06
0.0075497 Eth
$583,901.00
23,259.604 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1894%
43
Binance
LINK-TRY$25.22
0.0075837 Eth
$532,250.00
21,150.430 LINK
0.1723%
44
Bitbank
LINK-JPY$25.11
0.0075656 Eth
$503,937.00
20,065.707 LINK
0.1634%
45
Gemini
LINK-USD$25.05
0.0075442 Eth
$487,153.00
19,448.579 LINK
0.1584%
46
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$25.06
0.0075485 Eth
$424,113.00
16,827.274 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1371%
47
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$24.97
0.0075227 Eth
$407,102.00
16,276.576 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.1326%
48
WhiteBIT
LINK-EUR$25.08
0.0075528 Eth
$405,087.00
16,150.440 LINK
0.1315%
49
BigONE
LINK-USDT$25.09
0.0075590 Eth
$363,839.00
14,500.650 LINK
0.1181%
50
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$25.04
0.0075423 Eth
$356,682.00
14,199.660 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1157%
51
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$25.19
0.0075893 Eth
$347,929.00
28,392.356 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.2312%
52
Coinbase Exchange
LINK-USDT$25.07
0.0075518 Eth
$334,130.00
13,329.164 LINK
0.1086%
53
BitMart
LINK-BTC$25.05
0.0075455 Eth
$297,766.00
11,886.480 LINK
0.0968%
54
QMall
LINK-USDC$25.03
0.0075395 Eth
$283,630.00
11,331.974 LINK
0.0923%
55
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$25.06
0.0075497 Eth
$269,406.00
269,975.523 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
2.1988%
56
LATOKEN
LINK-BTC$25.08
0.0075555 Eth
$252,204.00
10,054.693 LINK
0.0819%
57
Coinbase Exchange
LINK-BTC$25.04
0.0075429 Eth
$247,038.00
9,864.920 LINK
0.0803%
58
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$25.07
0.0075540 Eth
$240,035.00
9,567.301 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0779%
59
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$25.03
0.0075401 Eth
$209,512.00
8,341.700 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0679%
60
Slex
LINK-ETH$25.05
0.0075333 Eth
$204,185.00
8,160.760 LINK
0.0665%
61
BitStorage
LINK-ETH$25.07
0.0075485 Eth
$190,138.00
7,584.830 LINK
0.0618%
62
DeGate
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$25.08
0.0075544 Eth
$172,901.00
6,905.790 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0562%
63
GMO Japan
LINK-JPY$25.06
0.0075508 Eth
$170,744.00
6,812.100 LINK
0.0555%
64
bitcastle
LINK-USDT$25.05
0.0075421 Eth
$158,189.00
6,322.370 LINK
0.0515%
65
Bitkub
LINK-THB$25.30
0.0076221 Eth
$101,782.00
4,022.772 LINK
0.0328%
66
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$25.03
0.0075383 Eth
$101,730.00
101,934.447 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.8302%
67
BitMart
LINK-ETH$25.05
0.0075458 Eth
$95,263.00
3,802.620 LINK
0.0310%
68
Hotcoin
LINK-BTC$25.07
0.0075489 Eth
$85,300.00
3,402.250 LINK
0.0277%
69
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$25.07
0.0075523 Eth
$82,425.00
3,289.187 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0268%
70
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$25.01
0.0075353 Eth
$77,119.00
77,276.599 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.6294%
71
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$25.08
0.0075564 Eth
$63,340.00
2,525.389 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0206%
72
Kraken
LINK-USDC$25.19
0.0075878 Eth
$51,992.00
2,063.890 LINK
0.0168%
73
Nonkyc.io
LINK-BTC$25.14
0.0075696 Eth
$47,343.00
1,892.861 LINK
0.0154%
74
Bitso
LINK-USD$25.07
0.0075489 Eth
$47,048.00
1,876.727 LINK
0.0153%
75
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$25.09
0.0075596 Eth
$46,143.00
1,848.188 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0151%
76
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$25.16
0.0075783 Eth
$41,734.00
1,663.891 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0136%
77
Uniswap V3 (Avalanche)
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$24.81
0.0074738 Eth
$31,489.00
1,234.626 0X5947BB275C521040051D82396192181B413227A3
0.0101%
78
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$25.04
0.0075428 Eth
$30,575.00
1,212.737 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0099%
79
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X1BFD67037B42CF73ACF2047067BD4F2C47D9BFD6$25.16
0.0075796 Eth
$25,929.00
1,034.343 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0084%
80
Dex-Trade
LINK-ETH$25.07
0.0075531 Eth
$25,776.00
1,028.060 LINK
0.0084%
81
Hotcoin
LINK-ETH$25.05
0.0075454 Eth
$25,043.00
999.870 LINK
0.0081%
82
THENA FUSION
0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$25.16
0.0075809 Eth
$24,746.00
32.869 0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827
0.0003%
83
OKX
LINK-EUR$25.02
0.0075370 Eth
$22,097.00
882.109 LINK
0.0072%
84
LFJ
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$25.11
0.0075652 Eth
$21,536.00
841.548 0X5947BB275C521040051D82396192181B413227A3
0.0069%
85
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$25.06
0.0075497 Eth
$21,441.00
852.623 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0069%
86
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X55D398326F99059FF775485246999027B3197955$25.20
0.0075908 Eth
$15,849.20
629.102 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0051%
87
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$25.12
0.0075665 Eth
$14,605.61
575.059 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0047%
88
zondacrypto
LINK-USDC$25.02
0.0075208 Eth
$12,109.50
484.034 LINK
0.0039%
89
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XDAC17F958D2EE523A2206206994597C13D831EC7$25.19
0.0075893 Eth
$11,923.84
474.943 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0039%
90
Gemini
LINK-BTC$24.96
0.0075168 Eth
$10,100.80
404.723 LINK
0.0033%
91
Uniswap V3 (Arbitrum One)
0XBA5DDD1F9D7F570DC94A51479A000E3BCE967196-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$25.13
0.0075721 Eth
$9,021.68
26.966 0XBA5DDD1F9D7F570DC94A51479A000E3BCE967196
0.0002%
92
Bitexen
LINK-TRY$24.94
0.0075033 Eth
$6,716.26
269.317 LINK
0.0022%
93
CoinEx
LINK-USDC$25.15
0.0075755 Eth
$5,683.36
225.900 LINK
0.0018%
94
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XD6DF932A45C0F255F85145F286EA0B292B21C90B$25.05
0.0075460 Eth
$4,311.31
174.803 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0014%
95
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$25.01
0.0075351 Eth
$4,121.58
4,123.952 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.0336%
96
Ace
LINK-USDT$25.09
0.0075557 Eth
$2,795.68
111.590 LINK
0.0009%
97
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$25.16
0.0075802 Eth
$2,461.42
98.213 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0008%
98
Lydia Finance
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$25.12
0.0075631 Eth
$2,423.10
94.571 0X5947BB275C521040051D82396192181B413227A3
0.0008%
99
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$25.13
0.0075697 Eth
$1,934.96
76.536 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0006%
100
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFA7F8980B0F1E64A2062791CC3B0871572F1F7F0$25.02
0.0075344 Eth
$1,599.82
64.678 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0005%

Contract Source Code Verified (Exact Match)

Contract Name:
LinkToken

Compiler Version
v0.4.16+commit.d7661dd9

Optimization Enabled:
Yes with 200 runs

Other Settings:
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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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