ETH Price: $3,287.46 (+0.52%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

725,625 ( -0.016%)

Market

Price

$20.12 @ 0.006120 ETH (+0.90%)

Onchain Market Cap

$20,120,000,000.00

Circulating Supply Market Cap

$12,700,467,516.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
28.445736984962002976 LINK

Value
$572.33 ( ~0.174094873552143 Eth) [0.0000%]
0x19d4bA55310EDa860AE008C3C180923eC1E14491
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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 18190.91% |ETH 0.0003846 1491.26%

Market

Volume (24H):$520,912,367.00
Market Capitalization:$12,700,467,516.00
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$20.10
0.0061144 Eth
$56,697,232.00
2,816,753.750 LINK
19.9854%
2
Coinbase Exchange
LINK-USD$20.12
0.0061186 Eth
$20,380,594.00
1,013,153.400 LINK
7.1885%
3
P2B
LINK-USDT$20.14
0.0061261 Eth
$11,846,258.00
588,180.180 LINK
4.1732%
4
WEEX
LINK-USDT$20.19
0.0061398 Eth
$11,843,510.00
588,501.910 LINK
4.1755%
5
Slex
LINK-USDT$20.16
0.0061298 Eth
$9,408,674.00
467,182.420 LINK
3.3147%
6
Bitget
LINK-USDT$20.13
0.0061231 Eth
$8,634,876.00
428,792.665 LINK
3.0424%
7
BVOX
LINK-USDT$20.10
0.0061162 Eth
$8,264,633.00
410,848.450 LINK
2.9150%
8
MEXC
LINK-USDT$20.16
0.0061302 Eth
$8,176,287.00
405,575.360 LINK
2.8776%
9
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$20.07
0.0061051 Eth
$7,969,761.00
393,869.340 0X514910771AF9CA656AF840DFF83E8264ECF986CA
2.7946%
10
Ourbit
LINK-USDT$20.13
0.0061224 Eth
$7,688,707.00
381,687.990 LINK
2.7081%
11
Bybit
LINK-USDT$20.12
0.0061200 Eth
$7,095,895.00
352,070.692 LINK
2.4980%
12
DigiFinex
LINK-USDT$20.12
0.0061206 Eth
$6,807,358.00
338,300.560 LINK
2.4003%
13
Deepcoin
LINK-USDT$20.12
0.0061199 Eth
$5,770,678.00
289,602.511 LINK
2.0548%
14
XT.COM
LINK-USDT$20.13
0.0061209 Eth
$5,671,791.00
281,594.010 LINK
1.9980%
15
Azbit
LINK-USDT$20.11
0.0061168 Eth
$5,664,247.00
281,192.372 LINK
1.9951%
16
FameEX
LINK-USDT$20.13
0.0061214 Eth
$5,658,214.00
280,912.176 LINK
1.9931%
17
OKX
LINK-USDT$20.13
0.0061218 Eth
$5,398,880.00
267,988.252 LINK
1.9014%
18
Gate.io
LINK-USDT$20.14
0.0061252 Eth
$5,223,880.00
258,745.060 LINK
1.8358%
19
Coinstore
LINK-USDT$20.14
0.0061233 Eth
$5,156,585.00
256,085.480 LINK
1.8170%
20
Niza Global
LINK-USD$20.13
0.0061207 Eth
$4,703,500.00
233,542.718 LINK
1.6570%
21
Kraken
LINK-USD$20.12
0.0061186 Eth
$4,698,535.00
233,573.072 LINK
1.6572%
22
CoinW
LINK-USDT$20.14
0.0061234 Eth
$4,530,304.00
224,969.570 LINK
1.5962%
23
HTX
LINK-USDT$20.12
0.0061193 Eth
$4,513,978.00
224,680.150 LINK
1.5941%
24
Binance
LINK-FDUSD$20.12
0.0061212 Eth
$4,299,189.00
213,381.480 LINK
1.5140%
25
Bitunix
LINK-USDT$20.12
0.0061221 Eth
$4,092,245.00
203,403.770 LINK
1.4432%
26
Toobit
LINK-USDT$20.12
0.0061200 Eth
$3,639,819.00
180,702.130 LINK
1.2821%
27
BYDFi
LINK-USDT$20.15
0.0061294 Eth
$3,169,111.00
157,272.230 LINK
1.1159%
28
LBank
LINK-USDT$20.13
0.0061254 Eth
$2,775,534.00
137,877.620 LINK
0.9783%
29
KuCoin
LINK-USDT$20.12
0.0061199 Eth
$2,753,989.00
136,881.662 LINK
0.9712%
30
LATOKEN
LINK-USDT$20.15
0.0061267 Eth
$2,731,793.00
135,583.123 LINK
0.9620%
31
QMall
LINK-USDT$20.13
0.0061233 Eth
$2,356,455.00
117,001.806 LINK
0.8301%
32
FMCPAY
LINK-USDT$20.13
0.0061211 Eth
$1,941,731.00
96,477.081 LINK
0.6845%
33
Dex-Trade
LINK-USDT$20.09
0.0061213 Eth
$1,821,526.00
90,664.470 LINK
0.6433%
34
BTSE
LINK-USDT$20.13
0.0061233 Eth
$1,622,215.00
80,585.642 LINK
0.5718%
35
Biconomy.com
LINK-USDT$20.12
0.0061217 Eth
$1,415,181.00
70,352.510 LINK
0.4992%
36
Coinbase Exchange
LINK-ETH$20.09
0.0061112 Eth
$1,393,002.00
69,344.910 LINK
0.4920%
37
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$20.12
0.0061202 Eth
$1,212,626.00
60,054.335 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.4261%
38
Coinbase Exchange
LINK-EUR$20.13
0.0061238 Eth
$1,088,483.00
54,073.840 LINK
0.3837%
39
FMCPAY
LINK-ETH$20.13
0.0061226 Eth
$1,075,342.00
53,249.120 LINK
0.3778%
40
FMCPAY
LINK-BTC$20.15
0.0061270 Eth
$1,019,373.00
50,308.400 LINK
0.3569%
41
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$20.09
0.0061113 Eth
$983,842.00
48,617.227 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.3449%
42
tanX
LINK-USDC$20.13
0.0061243 Eth
$972,919.00
48,355.980 LINK
0.3431%
43
Bitvavo
LINK-EUR$20.15
0.0061269 Eth
$945,844.00
46,942.363 LINK
0.3331%
44
PointPay
LINK-USDT$20.12
0.0061203 Eth
$919,959.00
45,670.807 LINK
0.3240%
45
CoinEx
LINK-USDT$20.12
0.0061187 Eth
$861,024.00
42,865.483 LINK
0.3041%
46
Azbit
LINK-ETH$20.14
0.0061248 Eth
$675,376.00
33,456.374 LINK
0.2374%
47
Coinbase Exchange
LINK-GBP$20.14
0.0061277 Eth
$645,940.00
32,068.730 LINK
0.2275%
48
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$20.21
0.0061453 Eth
$622,662.00
30,793.303 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.2185%
49
EXMO
LINK-USDT$20.12
0.0061196 Eth
$486,073.00
24,160.534 LINK
0.1714%
50
Bitbegin
LINK-USDT$19.99
0.0061180 Eth
$444,299.00
22,112.645 LINK
0.1569%
51
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$20.15
0.0061303 Eth
$380,109.00
18,855.746 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1338%
52
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$20.09
0.0061113 Eth
$374,343.00
27,334.266 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.1939%
53
Bitbank
LINK-JPY$20.19
0.0061416 Eth
$342,216.00
16,949.115 LINK
0.1203%
54
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$20.14
0.0061259 Eth
$334,194.00
334,494.445 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
2.3733%
55
BigONE
LINK-USDT$20.13
0.0061213 Eth
$301,969.00
15,000.160 LINK
0.1064%
56
BitMart
LINK-BTC$20.13
0.0061234 Eth
$271,183.00
13,470.580 LINK
0.0956%
57
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$20.15
0.0061295 Eth
$248,899.00
12,244.218 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0869%
58
QMall
LINK-USDC$20.12
0.0061203 Eth
$237,008.00
11,738.416 LINK
0.0833%
59
Gemini
LINK-USD$20.13
0.0061234 Eth
$228,099.00
11,330.339 LINK
0.0804%
60
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$20.16
0.0061333 Eth
$225,256.00
11,173.574 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0793%
61
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$20.15
0.0061303 Eth
$185,080.00
185,345.323 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
1.3151%
62
Slex
LINK-ETH$20.13
0.0061216 Eth
$184,004.00
9,105.200 LINK
0.0646%
63
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$20.18
0.0061382 Eth
$178,937.00
8,874.633 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0630%
64
BitStorage
LINK-ETH$20.13
0.0061216 Eth
$170,803.00
8,485.930 LINK
0.0602%
65
GMO Japan
LINK-JPY$20.07
0.0061052 Eth
$164,596.00
8,200.400 LINK
0.0582%
66
Coinbase Exchange
LINK-BTC$20.12
0.0061211 Eth
$163,795.00
8,139.260 LINK
0.0577%
67
OKX
LINK-USDC$20.12
0.0061213 Eth
$163,454.00
8,138.391 LINK
0.0577%
68
bitcastle
LINK-USDT$20.15
0.0061271 Eth
$138,143.00
6,864.980 LINK
0.0487%
69
LATOKEN
LINK-BTC$20.13
0.0061210 Eth
$111,078.00
5,517.982 LINK
0.0392%
70
PointPay
LINK-BTC$20.13
0.0061171 Eth
$91,115.00
4,475.528 LINK
0.0318%
71
BitMart
LINK-ETH$20.13
0.0061215 Eth
$88,118.00
4,378.480 LINK
0.0311%
72
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$20.08
0.0061065 Eth
$77,219.00
3,829.854 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0272%
73
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$20.11
0.0061185 Eth
$71,396.00
3,531.785 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0251%
74
Hotcoin
LINK-BTC$20.15
0.0061268 Eth
$62,373.00
3,095.680 LINK
0.0220%
75
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$20.15
0.0061295 Eth
$61,050.00
3,026.133 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0215%
76
Bitkub
LINK-THB$20.15
0.0061307 Eth
$60,770.00
3,015.908 LINK
0.0214%
77
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$20.12
0.0061236 Eth
$44,708.00
2,124.995 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0151%
78
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$20.12
0.0061201 Eth
$41,610.00
2,056.833 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0146%
79
Bitexen
LINK-TRY$20.00
0.0060840 Eth
$33,737.00
1,686.919 LINK
0.0120%
80
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$20.21
0.0061453 Eth
$29,966.00
29,883.656 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.2120%
81
Gemini
LINK-BTC$19.97
0.0060756 Eth
$27,688.00
1,386.163 LINK
0.0098%
82
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$20.18
0.0061380 Eth
$26,408.00
1,298.295 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0092%
83
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$20.05
0.0060969 Eth
$23,079.00
1,145.113 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0081%
84
Dex-Trade
LINK-ETH$20.05
0.0061123 Eth
$22,063.00
1,100.160 LINK
0.0078%
85
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$20.05
0.0060985 Eth
$13,093.25
648.754 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0046%
86
LFJ
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$20.05
0.0060981 Eth
$10,218.34
502.785 0X5947BB275C521040051D82396192181B413227A3
0.0036%
87
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$20.11
0.0061190 Eth
$7,885.46
390.826 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0028%
88
KuCoin
LINK-KCS$20.10
0.0061127 Eth
$7,654.40
380.894 LINK
0.0027%
89
Pangolin
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$20.07
0.0061020 Eth
$7,302.17
357.155 0X5947BB275C521040051D82396192181B413227A3
0.0025%
90
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X55D398326F99059FF775485246999027B3197955$20.06
0.0061030 Eth
$5,008.70
248.821 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0018%
91
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$20.10
0.0061119 Eth
$3,681.94
3,683.377 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.0261%
92
CoinEx
LINK-USDC$20.13
0.0061232 Eth
$3,077.06
153.478 LINK
0.0011%
93
Uniswap V3 (Arbitrum One)
0XBA5DDD1F9D7F570DC94A51479A000E3BCE967196-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$20.19
0.0061447 Eth
$2,554.62
8.753 0XBA5DDD1F9D7F570DC94A51479A000E3BCE967196
0.0001%
94
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XD6DF932A45C0F255F85145F286EA0B292B21C90B$20.04
0.0060955 Eth
$1,880.61
93.425 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0007%
95
CoinEx
LINK-BTC$20.04
0.0060947 Eth
$1,811.97
89.572 LINK
0.0006%
96
Retro
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$20.06
0.0061045 Eth
$1,191.08
58.888 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0004%
97
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFA7F8980B0F1E64A2062791CC3B0871572F1F7F0$20.15
0.0061266 Eth
$818.43
40.265 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0003%
98
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$20.17
0.0061367 Eth
$536.77
26.541 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0002%
99
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0XDA10009CBD5D07DD0CECC66161FC93D7C9000DA1$20.11
0.0061143 Eth
$362.50
17.962 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0001%
100
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X8F3CF7AD23CD3CADBD9735AFF958023239C6A063$20.14
0.0061267 Eth
$196.94
9.782 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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