ETH Price: $2,826.03 (+1.94%)
Gas: 0.76 Gwei

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

738,916 (0.00%)

Market

Price

$17.64 @ 0.006242 ETH (-0.61%)

Onchain Market Cap

$17,640,000,000.00

Circulating Supply Market Cap

$11,262,340,773.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
0.0000711 LINK

Value
$0.00 ( ~0 Eth) [0.0000%]
0x591871f22f61a2312b95725f68651be2f8a8fbc5
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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 15936.36% |ETH 0.0003846 1522.98%

Market

Volume (24H):$312,313,529.00
Market Capitalization:$11,262,340,773.00
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
WhiteBIT
LINK-USDT$17.68
0.0062520 Eth
$33,998,336.00
1,923,428.300 LINK
22.4489%
2
Websea
LINK-USDT$17.62
0.0062378 Eth
$31,829,931.00
0.000 LINK
0.0000%
3
HTX
LINK-USDT$17.67
0.0062565 Eth
$11,996,252.00
677,051.751 LINK
7.9021%
4
Coinbase Exchange
LINK-USD$17.63
0.0062425 Eth
$7,922,285.00
449,440.360 LINK
5.2455%
5
Bybit
LINK-USDT$17.69
0.0062571 Eth
$7,064,711.00
397,638.289 LINK
4.6409%
6
P2B
LINK-USDT$17.63
0.0062416 Eth
$6,629,965.00
376,071.860 LINK
4.3892%
7
Ourbit
LINK-USDT$17.61
0.0062366 Eth
$6,624,270.00
373,512.450 LINK
4.3594%
8
BVOX
LINK-USDT$17.58
0.0062323 Eth
$4,761,035.00
268,534.220 LINK
3.1341%
9
Bitget
LINK-USDT$17.67
0.0062514 Eth
$4,725,355.00
265,761.170 LINK
3.1018%
10
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$17.67
0.0062581 Eth
$4,022,344.00
224,035.153 0X514910771AF9CA656AF840DFF83E8264ECF986CA
2.6148%
11
DigiFinex
LINK-USDT$17.69
0.0062574 Eth
$3,701,895.00
209,252.790 LINK
2.4422%
12
OKX
LINK-USDT$17.70
0.0062652 Eth
$3,067,240.00
172,526.035 LINK
2.0136%
13
FameEX
LINK-USDT$17.62
0.0062426 Eth
$3,038,075.00
171,345.239 LINK
1.9998%
14
MEXC
LINK-EUR$17.59
0.0062243 Eth
$3,034,701.00
172,564.620 LINK
2.0141%
15
XT.COM
LINK-USDT$17.63
0.0062433 Eth
$3,012,794.00
169,898.320 LINK
1.9829%
16
MEXC
LINK-USDC$17.69
0.0062567 Eth
$2,939,190.00
166,156.620 LINK
1.9393%
17
Binance
LINK-FDUSD$17.68
0.0062578 Eth
$2,715,034.00
152,967.070 LINK
1.7853%
18
Hotcoin
LINK-USDT$17.63
0.0062395 Eth
$2,701,783.00
153,258.690 LINK
1.7887%
19
LBank
LINK-USDT$17.60
0.0062301 Eth
$2,687,620.00
152,698.290 LINK
1.7822%
20
KuCoin
LINK-USDT$17.68
0.0062561 Eth
$2,583,610.00
146,137.909 LINK
1.7056%
21
Gate.io
LINK-USDT$17.67
0.0062574 Eth
$2,227,562.00
125,759.880 LINK
1.4678%
22
BTSE
LINK-USDT$17.62
0.0062421 Eth
$2,126,434.00
120,676.349 LINK
1.4084%
23
Azbit
LINK-USDT$17.64
0.0062422 Eth
$1,880,276.00
105,986.684 LINK
1.2370%
24
Bitunix
LINK-USDT$17.60
0.0062304 Eth
$1,756,824.00
99,794.060 LINK
1.1647%
25
BYDFi
LINK-USDT$17.62
0.0062386 Eth
$1,687,823.00
95,799.780 LINK
1.1181%
26
Oceanex
LINK-USDT$17.63
0.0062433 Eth
$1,654,619.00
93,856.610 LINK
1.0954%
27
Toobit
LINK-USDT$17.66
0.0062558 Eth
$1,504,220.00
84,763.970 LINK
0.9893%
28
FMCPAY
LINK-USDT$17.62
0.0062417 Eth
$1,488,777.00
83,994.594 LINK
0.9803%
29
LATOKEN
LINK-USDT$17.61
0.0062351 Eth
$1,431,650.00
81,305.716 LINK
0.9489%
30
Biconomy.com
LINK-USDT$17.63
0.0062442 Eth
$1,121,312.00
63,230.580 LINK
0.7380%
31
Dex-Trade
LINK-USDT$17.68
0.0062607 Eth
$985,577.00
55,747.276 LINK
0.6506%
32
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$17.57
0.0062213 Eth
$899,560.00
50,120.418 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.5850%
33
FMCPAY
LINK-ETH$17.65
0.0062505 Eth
$894,971.00
49,918.560 LINK
0.5826%
34
CoinEx
LINK-USDT$17.64
0.0062426 Eth
$801,334.00
45,145.616 LINK
0.5269%
35
FMCPAY
LINK-BTC$17.60
0.0062392 Eth
$782,178.00
44,132.600 LINK
0.5151%
36
Binance
LINK-ETH$17.66
0.0062471 Eth
$707,788.00
39,668.580 LINK
0.4630%
37
Bitvavo
LINK-EUR$17.62
0.0062308 Eth
$696,217.00
39,507.537 LINK
0.4611%
38
Coinbase Exchange
LINK-EUR$17.68
0.0062566 Eth
$512,414.00
28,981.330 LINK
0.3382%
39
Azbit
LINK-ETH$17.65
0.0062452 Eth
$445,415.00
24,774.443 LINK
0.2891%
40
Coinbase Exchange
LINK-GBP$17.64
0.0062432 Eth
$387,871.00
21,984.460 LINK
0.2566%
41
BigONE
LINK-USDT$17.56
0.0062187 Eth
$340,103.00
19,362.870 LINK
0.2260%
42
WhiteBIT
LINK-BTC$17.63
0.0062410 Eth
$278,259.00
15,783.860 LINK
0.1842%
43
BitMart
LINK-BTC$17.63
0.0062426 Eth
$278,027.00
15,771.580 LINK
0.1841%
44
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$17.64
0.0062399 Eth
$269,464.00
15,136.686 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1767%
45
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$17.65
0.0062445 Eth
$228,501.00
229,413.059 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
2.6775%
46
LATOKEN
LINK-BTC$17.63
0.0062399 Eth
$213,854.00
12,132.609 LINK
0.1416%
47
Bitbank
LINK-JPY$17.71
0.0062722 Eth
$203,606.00
11,499.238 LINK
0.1342%
48
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$17.64
0.0062377 Eth
$188,557.00
10,506.086 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1226%
49
Bitci TR
LINK-TRY$17.72
0.0062754 Eth
$185,082.00
10,425.550 LINK
0.1217%
50
BitStorage
LINK-ETH$17.61
0.0062386 Eth
$179,943.00
10,217.530 LINK
0.1193%
51
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$17.65
0.0062445 Eth
$179,099.00
10,103.309 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1179%
52
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$17.59
0.0062203 Eth
$175,987.00
9,797.789 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.1144%
53
Slex
LINK-ETH$17.64
0.0062465 Eth
$172,947.00
9,698.190 LINK
0.1132%
54
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$17.67
0.0062597 Eth
$168,497.00
18,690.742 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.2181%
55
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$17.70
0.0062681 Eth
$157,636.00
8,875.501 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.1036%
56
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$17.55
0.0062173 Eth
$139,649.00
7,915.337 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0924%
57
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$17.64
0.0062382 Eth
$115,315.00
6,392.587 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0746%
58
Bybit
LINK-USDC$17.67
0.0062504 Eth
$103,208.00
5,859.130 LINK
0.0684%
59
Hotcoin
LINK-BTC$17.62
0.0062421 Eth
$91,317.00
5,182.260 LINK
0.0605%
60
BitMart
LINK-ETH$17.65
0.0062514 Eth
$88,120.00
4,992.660 LINK
0.0583%
61
BYDFi
LINK-USDC$17.52
0.0062106 Eth
$79,696.00
4,548.760 LINK
0.0531%
62
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$17.67
0.0062491 Eth
$74,657.00
4,161.619 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0486%
63
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$17.67
0.0062580 Eth
$73,525.00
4,150.110 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0484%
64
Coinbase Exchange
LINK-BTC$17.63
0.0062469 Eth
$55,946.00
3,172.540 LINK
0.0370%
65
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$17.63
0.0062427 Eth
$47,186.00
2,648.453 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0309%
66
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$17.57
0.0062213 Eth
$46,328.00
46,844.594 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.5467%
67
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$17.57
0.0062156 Eth
$46,231.00
2,582.168 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0301%
68
Uniswap V4 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$17.56
0.0062185 Eth
$39,948.00
40,397.005 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.4715%
69
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$17.64
0.0062500 Eth
$34,822.00
1,969.589 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0230%
70
Uniswap V4 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$17.56
0.0062185 Eth
$26,383.00
1,473.936 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0172%
71
Dex-Trade
LINK-ETH$17.56
0.0062212 Eth
$23,413.00
1,333.000 LINK
0.0156%
72
EXMO
LINK-BTC$17.62
0.0062403 Eth
$21,961.00
1,246.229 LINK
0.0145%
73
Uniswap V3 (Avalanche)
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$17.49
0.0061863 Eth
$21,216.00
1,216.310 0X5947BB275C521040051D82396192181B413227A3
0.0142%
74
Uniswap V4 (Ethereum)
0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48-0X514910771AF9CA656AF840DFF83E8264ECF986CA$17.67
0.0062582 Eth
$17,538.36
17,610.444 0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48
0.2055%
75
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XDAC17F958D2EE523A2206206994597C13D831EC7$17.67
0.0062597 Eth
$12,786.12
716.756 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0084%
76
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$17.65
0.0062445 Eth
$11,471.20
642.154 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0075%
77
Uniswap V4 (Arbitrum)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$17.58
0.0062261 Eth
$8,919.55
504.863 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0059%
78
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$17.65
0.0062532 Eth
$7,291.03
7,318.504 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.0854%
79
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$17.56
0.0062182 Eth
$6,465.96
364.245 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0043%
80
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$17.68
0.0062580 Eth
$5,966.79
332.261 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0039%
81
Bitexen
LINK-TRY$17.50
0.0061895 Eth
$4,714.77
269.391 LINK
0.0031%
82
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X1BFD67037B42CF73ACF2047067BD4F2C47D9BFD6$17.68
0.0062547 Eth
$4,702.42
264.466 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0031%
83
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$17.70
0.0062603 Eth
$4,147.73
4,160.825 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.0486%
84
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X55D398326F99059FF775485246999027B3197955$17.57
0.0062162 Eth
$4,088.40
232.070 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0027%
85
Uniswap V3 (BSC)
0XCF6BB5389C92BDDA8A3747DDB454CB7A64626C63-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$17.57
0.0062224 Eth
$3,993.78
482.414 0XCF6BB5389C92BDDA8A3747DDB454CB7A64626C63
0.0056%
86
CoinEx
LINK-USDC$17.60
0.0062340 Eth
$3,825.33
216.447 LINK
0.0025%
87
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFA7F8980B0F1E64A2062791CC3B0871572F1F7F0$17.56
0.0062177 Eth
$3,411.52
192.353 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0022%
88
Uniswap V4 (Polygon)
0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$17.56
0.0062185 Eth
$3,100.74
3,135.040 0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174
0.0366%
89
CoinEx
LINK-BTC$17.69
0.0062620 Eth
$3,031.67
170.109 LINK
0.0020%
90
PancakeSwap V3 (Arbitrum)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$17.60
0.0062356 Eth
$2,390.19
132.798 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0015%
91
Uniswap V3 (Arbitrum One)
0XBA5DDD1F9D7F570DC94A51479A000E3BCE967196-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$17.55
0.0062136 Eth
$2,388.12
9.758 0XBA5DDD1F9D7F570DC94A51479A000E3BCE967196
0.0001%
92
Retro
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$17.62
0.0062349 Eth
$1,044.11
58.110 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0007%
93
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$17.67
0.0062593 Eth
$979.21
52.848 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0006%
94
KuCoin
LINK-KCS$17.58
0.0062203 Eth
$841.87
47.893 LINK
0.0006%
95
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X8AC76A51CC950D9822D68B83FE1AD97B32CD580D$17.57
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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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