ETH Price: $2,705.86 (-2.08%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

739,002 ( 0.009%)

Market

Price

$16.77 @ 0.006198 ETH (-5.84%)

Onchain Market Cap

$16,770,000,000.00

Circulating Supply Market Cap

$10,702,744,182.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
0.000691 LINK

Value
$0.01 ( ~3.69568850884639E-06 Eth) [0.0000%]
0xa8842760b7c81e8993a2a40f0c16c5fb6342f6b4
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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 15145.45% |ETH 0.0003846 1511.54%

Market

Volume (24H):$347,848,016.00
Market Capitalization:$10,702,744,182.00
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$16.76
0.0061730 Eth
$35,901,172.00
2,052,077.020 LINK
22.1112%
2
HTX
LINK-USDT$16.74
0.0061691 Eth
$12,559,504.00
713,061.119 LINK
7.6833%
3
Coinbase Exchange
LINK-USD$16.73
0.0061615 Eth
$10,552,297.00
630,891.830 LINK
6.7979%
4
Bybit
LINK-USDT$16.72
0.0061648 Eth
$8,762,997.00
502,529.007 LINK
5.4148%
5
Ourbit
LINK-USDT$16.74
0.0061713 Eth
$7,959,060.00
454,485.020 LINK
4.8971%
6
P2B
LINK-USDT$16.75
0.0061610 Eth
$7,082,297.00
422,731.380 LINK
4.5549%
7
Bitget
LINK-USDT$16.74
0.0061711 Eth
$5,903,446.00
338,194.592 LINK
3.6441%
8
BVOX
LINK-USDT$16.84
0.0061868 Eth
$4,859,555.00
275,566.440 LINK
2.9692%
9
DigiFinex
LINK-USDT$16.74
0.0061712 Eth
$4,202,020.00
251,078.750 LINK
2.7054%
10
KuCoin
LINK-USDT$16.72
0.0061670 Eth
$3,852,993.00
230,380.606 LINK
2.4824%
11
OKX
LINK-USDT$16.74
0.0061702 Eth
$3,670,686.00
209,834.524 LINK
2.2610%
12
XT.COM
LINK-USDT$16.76
0.0061688 Eth
$3,537,338.00
202,167.870 LINK
2.1784%
13
MEXC
LINK-EUR$16.78
0.0061727 Eth
$3,503,283.00
208,762.060 LINK
2.2494%
14
FameEX
LINK-USDT$16.78
0.0061745 Eth
$3,494,617.00
199,436.123 LINK
2.1489%
15
MEXC
LINK-USDC$16.79
0.0061868 Eth
$3,397,024.00
202,267.520 LINK
2.1794%
16
Coinstore
LINK-USDT$16.79
0.0061867 Eth
$3,180,742.00
181,456.070 LINK
1.9552%
17
Binance
LINK-FDUSD$16.69
0.0061556 Eth
$3,142,924.00
179,615.680 LINK
1.9354%
18
Gate.io
LINK-USDT$16.73
0.0061639 Eth
$2,653,673.00
151,336.640 LINK
1.6307%
19
BTSE
LINK-USDT$16.73
0.0061628 Eth
$2,500,901.00
149,506.782 LINK
1.6109%
20
Azbit
LINK-USDT$16.73
0.0061640 Eth
$2,211,007.00
126,367.337 LINK
1.3616%
21
Bitunix
LINK-USDT$16.76
0.0061709 Eth
$2,043,503.00
121,898.420 LINK
1.3135%
22
FMCPAY
LINK-USDT$16.78
0.0061666 Eth
$1,893,138.00
107,938.596 LINK
1.1630%
23
BYDFi
LINK-USDT$16.76
0.0061688 Eth
$1,873,318.00
111,803.250 LINK
1.2047%
24
Toobit
LINK-USDT$16.74
0.0061677 Eth
$1,759,964.00
100,533.200 LINK
1.0832%
25
Biconomy.com
LINK-USDT$16.80
0.0061807 Eth
$1,157,628.00
65,674.550 LINK
0.7076%
26
Dex-Trade
LINK-USDT$16.78
0.0061740 Eth
$1,084,848.00
64,647.896 LINK
0.6966%
27
FMCPAY
LINK-BTC$16.76
0.0061690 Eth
$902,955.00
51,642.100 LINK
0.5564%
28
CoinEx
LINK-USDT$16.76
0.0061736 Eth
$883,518.00
50,153.314 LINK
0.5404%
29
FMCPAY
LINK-ETH$16.76
0.0061613 Eth
$878,726.00
51,236.320 LINK
0.5521%
30
Bitvavo
LINK-EUR$16.76
0.0061731 Eth
$796,870.00
47,533.479 LINK
0.5122%
31
Coinbase Exchange
LINK-EUR$16.74
0.0061697 Eth
$653,436.00
39,038.690 LINK
0.4206%
32
tanX
LINK-USDC$16.75
0.0061651 Eth
$642,574.00
36,501.110 LINK
0.3933%
33
Coinbase Exchange
LINK-GBP$16.72
0.0061633 Eth
$539,323.00
32,254.630 LINK
0.3475%
34
Bitbank
LINK-JPY$16.81
0.0061901 Eth
$462,957.00
27,547.492 LINK
0.2968%
35
EXMO
LINK-USDT$16.75
0.0061750 Eth
$384,035.00
22,923.780 LINK
0.2470%
36
BigONE
LINK-USDT$16.68
0.0061516 Eth
$369,911.00
22,173.460 LINK
0.2389%
37
WhiteBIT
LINK-BTC$16.74
0.0061647 Eth
$308,324.00
18,414.520 LINK
0.1984%
38
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$16.78
0.0061866 Eth
$306,076.00
17,901.716 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1929%
39
BitMart
LINK-BTC$16.78
0.0061876 Eth
$268,642.00
16,009.220 LINK
0.1725%
40
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$16.84
0.0062079 Eth
$268,326.00
280,063.169 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
3.0177%
41
Gemini
LINK-USD$16.74
0.0061721 Eth
$232,748.00
13,899.878 LINK
0.1498%
42
BitStorage
LINK-ETH$16.81
0.0061922 Eth
$210,149.00
12,500.320 LINK
0.1347%
43
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$16.78
0.0061850 Eth
$194,714.00
11,069.843 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.1193%
44
Slex
LINK-ETH$16.81
0.0061938 Eth
$187,807.00
10,986.430 LINK
0.1184%
45
Bitci TR
LINK-TRY$16.73
0.0061621 Eth
$183,537.00
10,379.680 LINK
0.1118%
46
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$16.81
0.0061937 Eth
$167,780.00
19,442.353 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.2095%
47
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$16.82
0.0061969 Eth
$145,888.00
8,462.092 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0912%
48
Bybit
LINK-USDC$16.75
0.0061775 Eth
$132,127.00
7,567.746 LINK
0.0815%
49
GMO Japan
LINK-JPY$16.76
0.0061777 Eth
$106,709.00
6,366.900 LINK
0.0686%
50
Bitkub
LINK-THB$16.80
0.0061789 Eth
$103,651.00
6,168.810 LINK
0.0665%
51
Hotcoin
LINK-BTC$16.77
0.0061777 Eth
$99,919.00
5,957.370 LINK
0.0642%
52
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$16.77
0.0061847 Eth
$95,610.00
5,599.774 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0603%
53
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$16.81
0.0061937 Eth
$92,342.00
5,245.812 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0565%
54
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$16.76
0.0061804 Eth
$89,151.00
5,230.226 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0564%
55
BitMart
LINK-ETH$16.75
0.0061771 Eth
$89,066.00
5,316.720 LINK
0.0573%
56
BYDFi
LINK-USDC$16.74
0.0061576 Eth
$87,478.00
5,224.810 LINK
0.0563%
57
Uniswap V3 (Avalanche)
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$16.78
0.0061870 Eth
$68,686.00
4,171.836 0X5947BB275C521040051D82396192181B413227A3
0.0450%
58
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$16.81
0.0061947 Eth
$64,512.00
3,703.988 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0399%
59
KuCoin
LINK-USDC$16.75
0.0061782 Eth
$64,326.00
3,839.227 LINK
0.0414%
60
Kanga
LINK-PLN$16.91
0.0062304 Eth
$57,199.00
0.000 LINK
0.0000%
61
BTCMarkets
LINK-AUD$16.97
0.0062477 Eth
$51,977.00
3,062.875 LINK
0.0330%
62
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$16.88
0.0062218 Eth
$48,975.00
2,864.510 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0309%
63
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$16.88
0.0062201 Eth
$48,517.00
50,706.915 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.5464%
64
Uniswap V4 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$16.77
0.0061826 Eth
$44,933.00
47,255.234 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.5092%
65
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$16.79
0.0061844 Eth
$31,918.00
1,886.725 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0203%
66
Uniswap V4 (Ethereum)
0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48-0X514910771AF9CA656AF840DFF83E8264ECF986CA$16.86
0.0062142 Eth
$28,010.00
29,088.554 0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48
0.3134%
67
Dex-Trade
LINK-ETH$16.76
0.0061641 Eth
$27,645.00
1,649.250 LINK
0.0178%
68
Uniswap V4 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$16.77
0.0061826 Eth
$27,197.00
1,590.706 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0171%
69
Indodax
LINK-IDR$16.91
0.0062304 Eth
$26,410.00
1,561.540 LINK
0.0168%
70
EXMO
LINK-BTC$16.90
0.0062308 Eth
$26,059.00
1,541.602 LINK
0.0166%
71
LFJ
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$16.66
0.0061394 Eth
$25,173.00
1,541.897 0X5947BB275C521040051D82396192181B413227A3
0.0166%
72
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XDAC17F958D2EE523A2206206994597C13D831EC7$16.80
0.0061918 Eth
$18,940.27
1,083.201 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0117%
73
Uniswap V4 (Arbitrum)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$17.02
0.0062701 Eth
$13,283.05
746.913 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0080%
74
Pangolin
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$16.77
0.0061802 Eth
$12,405.38
753.086 0X5947BB275C521040051D82396192181B413227A3
0.0081%
75
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$16.76
0.0061813 Eth
$10,745.10
628.444 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0068%
76
THENA FUSION
0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$16.81
0.0061972 Eth
$9,258.26
13.491 0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827
0.0001%
77
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$16.83
0.0062028 Eth
$8,170.24
8,524.215 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.0918%
78
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$16.86
0.0062069 Eth
$7,969.39
452.646 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0049%
79
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X1BFD67037B42CF73ACF2047067BD4F2C47D9BFD6$16.82
0.0062016 Eth
$6,554.51
376.537 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0041%
80
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X55D398326F99059FF775485246999027B3197955$16.85
0.0062147 Eth
$6,170.39
352.870 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0038%
81
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$16.88
0.0062173 Eth
$4,157.08
4,341.397 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.0468%
82
Bitexen
LINK-TRY$16.68
0.0061352 Eth
$3,711.97
222.520 LINK
0.0024%
83
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XD93F7E271CB87C23AAA73EDC008A79646D1F9912$16.82
0.0062010 Eth
$3,531.05
207.666 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0022%
84
CoinEx
LINK-USDC$16.75
0.0061747 Eth
$3,326.50
188.209 LINK
0.0020%
85
Uniswap V3 (Arbitrum One)
0XBA5DDD1F9D7F570DC94A51479A000E3BCE967196-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$16.72
0.0061644 Eth
$3,256.72
13.876 0XBA5DDD1F9D7F570DC94A51479A000E3BCE967196
0.0001%
86
Uniswap V3 (BSC)
0XCF6BB5389C92BDDA8A3747DDB454CB7A64626C63-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$16.78
0.0061769 Eth
$3,191.93
400.377 0XCF6BB5389C92BDDA8A3747DDB454CB7A64626C63
0.0043%
87
CoinEx
LINK-BTC$16.84
0.0062023 Eth
$3,114.44
176.944 LINK
0.0019%
88
PancakeSwap V3 (Arbitrum)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$16.77
0.0061767 Eth
$2,479.10
144.882 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0016%
89
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFA7F8980B0F1E64A2062791CC3B0871572F1F7F0$16.69
0.0061534 Eth
$1,870.61
110.100 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0012%
90
Uniswap V3 (Ethereum)
0X7FC66500C84A76AD7E9C93437BFC5AC33E2DDAE9-0X514910771AF9CA656AF840DFF83E8264ECF986CA$16.81
0.0061937 Eth
$1,530.09
6.483 0X7FC66500C84A76AD7E9C93437BFC5AC33E2DDAE9
0.0001%
91
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X8AC76A51CC950D9822D68B83FE1AD97B32CD580D$16.83
0.0062007 Eth
$1,139.09
64.709 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0007%
92
Retro
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$16.76
0.0061650 Eth
$1,138.15
66.436 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0007%
93
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XD6DF932A45C0F255F85145F286EA0B292B21C90B$16.73
0.0061648 Eth
$1,055.14
62.267 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0007%
94
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$16.83
0.0061978 Eth
$922.50
53.538 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0006%
95
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$16.80
0.0061864 Eth
$910.63
51.627 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0006%
96
LFJ
0X5947BB275C521040051D82396192181B413227A3-0XD036414FA2BCBB802691491E323BFF1348C5F4BA$16.63
0.0061269 Eth
$809.12
49.081 0X5947BB275C521040051D82396192181B413227A3
0.0005%
97
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$16.83
0.0062002 Eth
$744.73
43.475 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0005%
98
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X55D398326F99059FF775485246999027B3197955$16.80
0.0061915 Eth
$686.59
39.874 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0004%
99
Uniswap V4 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X55D398326F99059FF775485246999027B3197955$16.95
0.0062442 Eth
$331.58
18.786 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0002%
100
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X8F3CF7AD23CD3CADBD9735AFF958023239C6A063$16.80
0.0061900 Eth
$162.62
9.280 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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