ETH Price: $2,697.92 (+4.76%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

733,454 (0.00%)

Market

Price

$19.11 @ 0.007083 ETH (+4.04%)

Onchain Market Cap

$19,110,000,000.00

Circulating Supply Market Cap

$12,181,700,515.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
63.60959032 LINK

Value
$1,215.58 ( ~0.450561943049957 Eth) [0.0000%]
0xefcecbde8a00cfb97f5378ebe71d65475b3dde5d
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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 17272.73% |ETH 0.0003846 1741.65%

Market

Volume (24H):$538,892,574.00
Market Capitalization:$12,181,700,515.00
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$19.14
0.0070843 Eth
$67,287,089.00
3,619,571.630 LINK
22.3930%
2
Coinbase Exchange
LINK-USD$19.07
0.0070411 Eth
$26,811,022.00
1,406,147.890 LINK
8.6993%
3
Bybit
LINK-USDT$19.03
0.0070573 Eth
$22,956,620.00
1,233,162.599 LINK
7.6291%
4
HTX
LINK-USDT$19.03
0.0070493 Eth
$18,430,625.00
988,990.027 LINK
6.1185%
5
Slex
LINK-USDT$19.05
0.0070528 Eth
$15,858,275.00
850,042.380 LINK
5.2589%
6
P2B
LINK-USDT$19.07
0.0070640 Eth
$13,836,802.00
725,522.590 LINK
4.4886%
7
WhiteBIT
LINK-USDT$19.15
0.0070748 Eth
$11,169,171.00
583,168.140 LINK
3.6079%
8
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$19.09
0.0070805 Eth
$10,468,274.00
552,381.996 0X514910771AF9CA656AF840DFF83E8264ECF986CA
3.4174%
9
OKX
LINK-USDT$19.03
0.0070555 Eth
$8,922,239.00
479,494.692 LINK
2.9665%
10
DigiFinex
LINK-USDT$19.01
0.0070505 Eth
$8,582,470.00
451,374.580 LINK
2.7925%
11
XT.COM
LINK-USDT$19.03
0.0070553 Eth
$6,665,303.00
358,803.790 LINK
2.2198%
12
BTSE
LINK-USDT$19.08
0.0070425 Eth
$6,090,782.00
319,160.691 LINK
1.9745%
13
Coinstore
LINK-USDT$19.00
0.0070362 Eth
$5,968,156.00
321,061.620 LINK
1.9863%
14
CoinW
LINK-USDT$19.06
0.0070383 Eth
$5,015,930.00
263,162.890 LINK
1.6281%
15
Bitunix
LINK-USDT$19.06
0.0070540 Eth
$4,877,907.00
256,014.680 LINK
1.5839%
16
Binance
LINK-FDUSD$19.06
0.0070600 Eth
$4,777,440.00
256,578.780 LINK
1.5874%
17
KuCoin
LINK-USDT$19.04
0.0070498 Eth
$4,205,278.00
220,915.636 LINK
1.3667%
18
Kraken
LINK-USD$19.03
0.0070489 Eth
$3,983,225.00
209,275.759 LINK
1.2947%
19
Bitvavo
LINK-EUR$19.07
0.0070365 Eth
$3,927,618.00
205,986.034 LINK
1.2744%
20
BYDFi
LINK-USDT$19.08
0.0070490 Eth
$3,858,468.00
202,196.510 LINK
1.2509%
21
LATOKEN
LINK-USDT$19.07
0.0070430 Eth
$3,252,281.00
170,518.633 LINK
1.0549%
22
Coinbase Exchange
LINK-EUR$19.08
0.0070571 Eth
$2,716,103.00
142,336.830 LINK
0.8806%
23
QMall
LINK-USDT$19.07
0.0070433 Eth
$2,593,189.00
139,195.419 LINK
0.8612%
24
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$19.02
0.0070356 Eth
$2,346,112.00
123,371.005 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.7633%
25
Dex-Trade
LINK-USDT$19.05
0.0070616 Eth
$2,242,500.00
117,704.522 LINK
0.7282%
26
FMCPAY
LINK-USDT$19.14
0.0070538 Eth
$2,146,587.00
115,174.019 LINK
0.7125%
27
Coinbase Exchange
LINK-GBP$19.04
0.0070500 Eth
$1,456,223.00
76,497.370 LINK
0.4733%
28
Biconomy.com
LINK-USDT$19.08
0.0070494 Eth
$1,421,034.00
76,283.730 LINK
0.4719%
29
FMCPAY
LINK-ETH$19.04
0.0070496 Eth
$1,309,673.00
68,990.720 LINK
0.4268%
30
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$18.99
0.0070244 Eth
$1,135,422.00
59,853.092 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.3703%
31
CoinEx
LINK-USDT$19.05
0.0070458 Eth
$1,119,365.00
59,796.116 LINK
0.3699%
32
PointPay
LINK-USDT$19.07
0.0070453 Eth
$974,166.00
52,224.271 LINK
0.3231%
33
Trubit
LINK-USDT$19.05
0.0070460 Eth
$907,345.00
48,726.880 LINK
0.3015%
34
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$19.10
0.0070822 Eth
$811,918.00
84,839.649 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.5249%
35
Phemex
LINK-USDT$19.04
0.0070502 Eth
$761,016.00
39,975.900 LINK
0.2473%
36
tanX
LINK-USDC$19.07
0.0070432 Eth
$753,238.00
40,368.790 LINK
0.2497%
37
EXMO
LINK-USDT$19.06
0.0070565 Eth
$731,831.00
38,389.030 LINK
0.2375%
38
BigONE
LINK-USDT$19.05
0.0070471 Eth
$678,548.00
35,609.980 LINK
0.2203%
39
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$19.14
0.0070801 Eth
$602,123.00
32,486.196 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.2010%
40
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$19.03
0.0070376 Eth
$579,529.00
30,466.087 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1885%
41
Bitbank
LINK-JPY$19.09
0.0070805 Eth
$545,321.00
28,558.623 LINK
0.1767%
42
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$19.11
0.0070709 Eth
$541,538.00
28,172.806 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1743%
43
Binance
LINK-TRY$19.08
0.0070719 Eth
$520,226.00
27,845.080 LINK
0.1723%
44
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$19.10
0.0070706 Eth
$477,414.00
25,110.434 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.1553%
45
WhiteBIT
LINK-BTC$19.11
0.0070438 Eth
$459,705.00
24,058.440 LINK
0.1488%
46
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$19.11
0.0070698 Eth
$445,369.00
23,421.913 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1449%
47
WhiteBIT
LINK-TRY$19.07
0.0070392 Eth
$441,479.00
23,144.580 LINK
0.1432%
48
EarnBIT
LINK-USDT$19.03
0.0070475 Eth
$403,127.00
21,651.134 LINK
0.1339%
49
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$19.14
0.0070801 Eth
$374,637.00
363,469.923 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
2.2487%
50
QMall
LINK-USDC$19.08
0.0070453 Eth
$361,939.00
19,374.977 LINK
0.1199%
51
Bybit
LINK-USDC$19.11
0.0070861 Eth
$349,392.00
18,716.320 LINK
0.1158%
52
Gemini
LINK-USD$19.07
0.0070704 Eth
$343,959.00
18,039.005 LINK
0.1116%
53
Slex
LINK-ETH$19.02
0.0070525 Eth
$317,730.00
16,746.830 LINK
0.1036%
54
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$18.98
0.0070178 Eth
$314,743.00
17,024.242 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.1053%
55
BitMart
LINK-BTC$19.07
0.0070539 Eth
$269,233.00
14,119.380 LINK
0.0874%
56
BitDelta
LINK-USDT$19.03
0.0070454 Eth
$264,848.00
14,244.000 LINK
0.0881%
57
OKX
LINK-USDC$19.03
0.0070575 Eth
$259,698.00
13,869.540 LINK
0.0858%
58
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$19.08
0.0070672 Eth
$258,741.00
13,639.254 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0844%
59
WhiteBIT
LINK-EUR$19.04
0.0070514 Eth
$251,317.00
13,199.440 LINK
0.0817%
60
itBit
LINK-USD$19.11
0.0070702 Eth
$249,573.00
13,059.805 LINK
0.0808%
61
DeGate
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$19.03
0.0070323 Eth
$188,021.00
10,137.124 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0627%
62
LATOKEN
LINK-BTC$19.06
0.0070650 Eth
$187,291.00
9,825.910 LINK
0.0608%
63
Hotcoin
LINK-BTC$19.08
0.0070457 Eth
$175,463.00
9,196.460 LINK
0.0569%
64
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$19.08
0.0070732 Eth
$161,177.00
8,722.453 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0540%
65
BYDFi
LINK-USDC$19.10
0.0070569 Eth
$157,851.00
8,262.620 LINK
0.0511%
66
CoinTR
LINK-TRY$19.08
0.0070714 Eth
$153,507.00
8,208.580 LINK
0.0508%
67
BitStorage
LINK-ETH$19.06
0.0070492 Eth
$150,821.00
7,914.810 LINK
0.0490%
68
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$18.98
0.0070178 Eth
$141,391.00
138,155.475 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.8547%
69
KuCoin
LINK-USDC$19.14
0.0070900 Eth
$133,019.00
6,948.195 LINK
0.0430%
70
OKX
LINK-EUR$19.09
0.0070773 Eth
$125,606.00
6,737.197 LINK
0.0417%
71
Binance US
LINK-USDT$19.09
0.0070527 Eth
$118,349.00
6,198.644 LINK
0.0383%
72
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$19.08
0.0070581 Eth
$110,437.00
5,915.434 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0366%
73
Bitso
LINK-USD$19.11
0.0070508 Eth
$101,682.00
5,320.922 LINK
0.0329%
74
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$18.93
0.0070087 Eth
$94,044.00
4,962.327 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0307%
75
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XDAC17F958D2EE523A2206206994597C13D831EC7$19.10
0.0070822 Eth
$93,869.00
5,041.632 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0312%
76
Uniswap V4 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$19.13
0.0070947 Eth
$83,765.00
81,358.787 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.5033%
77
BitMart
LINK-ETH$19.07
0.0070528 Eth
$72,321.00
3,793.300 LINK
0.0235%
78
Bitkub
LINK-THB$19.08
0.0070478 Eth
$71,041.00
3,724.192 LINK
0.0230%
79
Indodax
LINK-IDR$19.10
0.0070467 Eth
$63,068.00
3,301.459 LINK
0.0204%
80
Uniswap V4 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$19.11
0.0070879 Eth
$59,894.00
3,148.647 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0195%
81
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$19.04
0.0070465 Eth
$50,929.00
2,682.566 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0166%
82
Hotcoin
LINK-ETH$19.13
0.0070493 Eth
$48,384.00
2,529.560 LINK
0.0156%
83
Bitexen
LINK-TRY$18.89
0.0069994 Eth
$34,045.00
1,802.728 LINK
0.0112%
84
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFA7F8980B0F1E64A2062791CC3B0871572F1F7F0$19.06
0.0070314 Eth
$27,182.00
1,399.942 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0087%
85
Uniswap V3 (Avalanche)
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$19.16
0.0070862 Eth
$22,267.00
1,156.778 0X5947BB275C521040051D82396192181B413227A3
0.0072%
86
Dex-Trade
LINK-ETH$19.12
0.0070602 Eth
$21,077.00
1,102.400 LINK
0.0068%
87
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$19.15
0.0070855 Eth
$20,756.00
1,080.185 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0067%
88
Uniswap V4 (Arbitrum)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$19.09
0.0070362 Eth
$19,091.00
1,029.456 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0064%
89
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$18.97
0.0070235 Eth
$17,026.07
903.041 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0056%
90
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$19.06
0.0070317 Eth
$16,536.72
16,117.714 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.0997%
91
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$19.06
0.0070310 Eth
$15,542.60
836.760 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0052%
92
THENA FUSION
0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$19.06
0.0070474 Eth
$15,441.93
22.816 0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827
0.0001%
93
Uniswap V3 (Arbitrum One)
0XBA5DDD1F9D7F570DC94A51479A000E3BCE967196-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$19.03
0.0070202 Eth
$12,444.76
49.106 0XBA5DDD1F9D7F570DC94A51479A000E3BCE967196
0.0003%
94
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$19.10
0.0070700 Eth
$11,839.67
606.568 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0038%
95
Gemini
LINK-BTC$18.87
0.0069979 Eth
$11,284.40
597.940 LINK
0.0037%
96
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X1BFD67037B42CF73ACF2047067BD4F2C47D9BFD6$19.04
0.0070447 Eth
$9,930.91
530.308 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0033%
97
LFJ
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$19.17
0.0070997 Eth
$7,987.20
418.388 0X5947BB275C521040051D82396192181B413227A3
0.0026%
98
PancakeSwap V3 (Arbitrum)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$19.04
0.0070504 Eth
$6,115.35
321.513 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0020%
99
PancakeSwap V1 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$19.05
0.0070569 Eth
$5,493.16
288.686 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0018%
100
CoinEx
LINK-BTC$19.14
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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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