ETH Price: $2,804.59 (+2.26%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

737,175 ( 0.014%)

Market

Price

$18.80 @ 0.006703 ETH (+3.45%)

Onchain Market Cap

$18,800,000,000.00

Circulating Supply Market Cap

$11,989,322,874.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
0.000555020421745269 LINK

Value
$0.01 ( ~3.56558787047695E-06 Eth) [0.0000%]
0x4ca5208ab71d9f4219730f7f625c8eb4d0093883
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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 16990.91% |ETH 0.0003846 1642.85%

Market

Volume (24H):$461,095,086.00
Market Capitalization:$11,989,322,874.00
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$18.80
0.0067033 Eth
$53,608,279.00
2,851,465.330 LINK
24.1292%
2
Coinbase Exchange
LINK-USD$18.81
0.0067057 Eth
$20,833,404.00
1,107,806.220 LINK
9.3743%
3
Bybit
LINK-USDT$18.80
0.0067015 Eth
$18,674,402.00
1,021,364.522 LINK
8.6428%
4
HTX
LINK-USDT$18.81
0.0067069 Eth
$17,516,264.00
958,761.656 LINK
8.1131%
5
P2B
LINK-USDT$18.78
0.0066972 Eth
$9,088,811.00
483,904.690 LINK
4.0948%
6
Gate.io
LINK-USDT$18.80
0.0067044 Eth
$5,701,367.00
310,583.020 LINK
2.6282%
7
KuCoin
LINK-USDT$18.80
0.0067043 Eth
$5,087,016.00
270,547.920 LINK
2.2894%
8
OKX
LINK-USDT$18.80
0.0067015 Eth
$4,774,445.00
260,498.946 LINK
2.2044%
9
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$18.80
0.0067032 Eth
$4,576,730.00
245,996.624 0X514910771AF9CA656AF840DFF83E8264ECF986CA
2.0816%
10
Binance
LINK-FDUSD$18.79
0.0067030 Eth
$4,485,137.00
244,646.930 LINK
2.0702%
11
MEXC
LINK-EUR$18.77
0.0066933 Eth
$4,261,543.00
227,034.760 LINK
1.9212%
12
XT.COM
LINK-USDT$18.82
0.0067114 Eth
$4,213,946.00
230,020.430 LINK
1.9464%
13
MEXC
LINK-USDC$18.79
0.0066995 Eth
$4,061,751.00
216,191.640 LINK
1.8294%
14
Coinstore
LINK-USDT$18.75
0.0066872 Eth
$3,948,438.00
215,641.670 LINK
1.8248%
15
CoinW
LINK-USDT$18.79
0.0067034 Eth
$3,591,264.00
191,116.640 LINK
1.6172%
16
BTSE
LINK-USDT$18.81
0.0067065 Eth
$3,169,597.00
168,511.355 LINK
1.4260%
17
Kraken
LINK-USD$18.81
0.0067082 Eth
$2,777,154.00
147,614.875 LINK
1.2491%
18
Bitunix
LINK-USDT$18.78
0.0066973 Eth
$2,671,995.00
142,324.500 LINK
1.2044%
19
Azbit
LINK-USDT$18.80
0.0067063 Eth
$2,596,783.00
141,691.140 LINK
1.1990%
20
BYDFi
LINK-USDT$18.78
0.0067006 Eth
$2,491,911.00
132,668.770 LINK
1.1226%
21
Bitvavo
LINK-EUR$18.80
0.0067011 Eth
$2,347,034.00
124,865.069 LINK
1.0566%
22
LATOKEN
LINK-USDT$18.80
0.0067045 Eth
$1,970,129.00
104,781.568 LINK
0.8867%
23
Coinbase Exchange
LINK-GBP$18.79
0.0067008 Eth
$1,873,594.00
99,732.720 LINK
0.8439%
24
QMall
LINK-USDT$18.80
0.0067034 Eth
$1,792,098.00
97,751.209 LINK
0.8272%
25
FMCPAY
LINK-USDT$18.81
0.0067076 Eth
$1,577,983.00
86,241.504 LINK
0.7298%
26
Dex-Trade
LINK-USDT$18.78
0.0066992 Eth
$1,430,672.00
76,168.590 LINK
0.6445%
27
Biconomy.com
LINK-USDT$18.78
0.0066986 Eth
$1,219,532.00
66,717.010 LINK
0.5646%
28
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$18.80
0.0067034 Eth
$1,150,275.00
61,740.167 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.5224%
29
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$18.68
0.0066606 Eth
$1,063,341.00
57,073.698 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.4830%
30
FMCPAY
LINK-ETH$18.81
0.0067056 Eth
$1,044,326.00
56,072.640 LINK
0.4745%
31
FMCPAY
LINK-BTC$18.80
0.0067037 Eth
$905,379.00
49,169.200 LINK
0.4161%
32
Trubit
LINK-USDT$18.80
0.0067035 Eth
$825,490.00
45,186.990 LINK
0.3824%
33
Coinbase Exchange
LINK-EUR$18.78
0.0066989 Eth
$823,794.00
43,863.370 LINK
0.3712%
34
tanX
LINK-USDC$18.78
0.0067007 Eth
$756,959.00
41,446.850 LINK
0.3507%
35
CoinEx
LINK-USDT$18.76
0.0066972 Eth
$747,629.00
40,954.586 LINK
0.3466%
36
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$18.80
0.0067016 Eth
$728,794.00
39,124.314 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.3311%
37
PointPay
LINK-USDT$18.80
0.0067044 Eth
$699,892.00
38,178.576 LINK
0.3231%
38
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$18.87
0.0067288 Eth
$626,979.00
65,077.302 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.5507%
39
BigONE
LINK-USDT$18.84
0.0067182 Eth
$584,060.00
30,999.180 LINK
0.2623%
40
Binance
LINK-EUR$18.73
0.0066897 Eth
$489,609.00
26,801.260 LINK
0.2268%
41
Phemex
LINK-USDT$18.81
0.0067071 Eth
$481,994.00
25,619.550 LINK
0.2168%
42
WhiteBIT
LINK-BTC$18.78
0.0066996 Eth
$441,000.00
23,478.730 LINK
0.1987%
43
EXMO
LINK-USDT$18.83
0.0067124 Eth
$439,035.00
23,320.603 LINK
0.1973%
44
Binance
LINK-TRY$18.70
0.0066753 Eth
$403,807.00
22,100.310 LINK
0.1870%
45
Bitbank
LINK-JPY$18.84
0.0067210 Eth
$403,612.00
21,418.489 LINK
0.1812%
46
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$18.79
0.0066982 Eth
$401,643.00
21,560.331 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1824%
47
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$18.80
0.0067038 Eth
$397,983.00
387,745.429 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
3.2811%
48
Gemini
LINK-USD$18.79
0.0067002 Eth
$336,913.00
17,928.804 LINK
0.1517%
49
BitMart
LINK-BTC$18.80
0.0067052 Eth
$308,128.00
16,385.680 LINK
0.1387%
50
QMall
LINK-USDC$18.82
0.0067087 Eth
$308,084.00
16,840.838 LINK
0.1425%
51
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$18.80
0.0067038 Eth
$296,991.00
16,230.895 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1373%
52
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$18.78
0.0066970 Eth
$296,681.00
15,971.110 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1351%
53
LATOKEN
LINK-BTC$18.78
0.0066964 Eth
$254,769.00
13,569.568 LINK
0.1148%
54
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$18.72
0.0066741 Eth
$215,954.00
11,660.024 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0987%
55
GMO Japan
LINK-JPY$18.79
0.0067005 Eth
$212,497.00
11,308.500 LINK
0.0957%
56
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$18.77
0.0066927 Eth
$206,839.00
11,315.412 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0958%
57
Bitci TR
LINK-TRY$18.62
0.0066456 Eth
$183,146.00
10,057.030 LINK
0.0851%
58
WEEX
LINK-USDC$18.79
0.0067034 Eth
$179,229.00
9,812.500 LINK
0.0830%
59
NovaDAX
LINK-BRL$18.63
0.0066465 Eth
$179,160.00
9,616.112 LINK
0.0814%
60
BitDelta
LINK-USDT$18.80
0.0067045 Eth
$175,031.00
9,583.000 LINK
0.0811%
61
Bitbegin
LINK-USDT$18.80
0.0067028 Eth
$165,082.00
9,039.465 LINK
0.0765%
62
OKX
LINK-USDC$18.78
0.0066967 Eth
$164,047.00
8,967.711 LINK
0.0759%
63
Hotcoin
LINK-BTC$18.79
0.0067028 Eth
$160,953.00
8,564.390 LINK
0.0725%
64
BitStorage
LINK-ETH$18.81
0.0067064 Eth
$147,153.00
7,824.200 LINK
0.0662%
65
BYDFi
LINK-USDC$18.75
0.0066890 Eth
$146,822.00
7,830.300 LINK
0.0663%
66
Slex
LINK-ETH$18.80
0.0067107 Eth
$145,435.00
7,812.420 LINK
0.0661%
67
Coinbase Exchange
LINK-BTC$18.78
0.0066996 Eth
$128,235.00
6,827.200 LINK
0.0578%
68
WhiteBIT
LINK-TRY$18.73
0.0066829 Eth
$125,432.00
6,695.620 LINK
0.0567%
69
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$18.83
0.0067142 Eth
$124,228.00
6,767.769 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0573%
70
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$18.78
0.0066943 Eth
$122,856.00
6,606.483 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0559%
71
CoinTR
LINK-TRY$18.73
0.0066795 Eth
$120,115.00
6,593.200 LINK
0.0558%
72
bitcastle
LINK-USDT$18.79
0.0067068 Eth
$97,381.00
5,322.330 LINK
0.0450%
73
Bitkub
LINK-THB$18.75
0.0066871 Eth
$95,347.00
5,084.180 LINK
0.0430%
74
KuCoin
LINK-USDC$18.76
0.0066877 Eth
$81,094.00
4,323.596 LINK
0.0366%
75
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$18.78
0.0066974 Eth
$78,042.00
4,185.310 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0354%
76
Uniswap V4 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$18.76
0.0066886 Eth
$76,782.00
4,129.802 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0349%
77
Uniswap V4 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$18.76
0.0066883 Eth
$74,527.00
72,725.967 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.6154%
78
Binance US
LINK-USDT$18.77
0.0066927 Eth
$72,216.00
3,846.912 LINK
0.0326%
79
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$18.68
0.0066609 Eth
$61,772.00
60,431.510 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.5114%
80
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$18.70
0.0066674 Eth
$49,450.00
2,676.800 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0227%
81
Hotcoin
LINK-ETH$18.79
0.0067005 Eth
$44,639.00
2,375.610 LINK
0.0201%
82
Bitso
LINK-USD$18.73
0.0066894 Eth
$41,048.00
2,191.190 LINK
0.0185%
83
Uniswap V4 (Ethereum)
0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48-0X514910771AF9CA656AF840DFF83E8264ECF986CA$18.79
0.0066991 Eth
$29,978.00
29,278.956 0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48
0.2478%
84
EXMO
LINK-BTC$18.84
0.0067163 Eth
$26,550.00
1,409.440 LINK
0.0119%
85
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XDAC17F958D2EE523A2206206994597C13D831EC7$18.79
0.0066999 Eth
$23,948.00
1,311.034 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0111%
86
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$18.81
0.0067080 Eth
$23,395.00
1,254.531 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0106%
87
Dex-Trade
LINK-ETH$18.82
0.0067096 Eth
$20,029.00
1,064.330 LINK
0.0090%
88
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$18.82
0.0067112 Eth
$13,250.79
711.240 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0060%
89
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$18.77
0.0066927 Eth
$11,973.78
11,666.945 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.0987%
90
THENA FUSION
0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$18.73
0.0066793 Eth
$11,937.29
16.288 0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827
0.0001%
91
CoinEx
LINK-BTC$18.87
0.0067300 Eth
$10,612.08
569.850 LINK
0.0048%
92
Uniswap V3 (Avalanche)
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$18.66
0.0066513 Eth
$10,536.29
559.081 0X5947BB275C521040051D82396192181B413227A3
0.0047%
93
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$18.77
0.0066931 Eth
$9,895.87
540.315 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0046%
94
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X55D398326F99059FF775485246999027B3197955$18.75
0.0066846 Eth
$8,401.76
460.224 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0039%
95
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFA7F8980B0F1E64A2062791CC3B0871572F1F7F0$18.68
0.0066610 Eth
$8,345.39
449.723 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0038%
96
Uniswap V3 (BSC)
0XCF6BB5389C92BDDA8A3747DDB454CB7A64626C63-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$18.70
0.0066684 Eth
$8,050.02
885.124 0XCF6BB5389C92BDDA8A3747DDB454CB7A64626C63
0.0075%
97
Uniswap V3 (Arbitrum One)
0XBA5DDD1F9D7F570DC94A51479A000E3BCE967196-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$18.67
0.0066587 Eth
$5,889.93
22.217 0XBA5DDD1F9D7F570DC94A51479A000E3BCE967196
0.0002%
98
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X1BFD67037B42CF73ACF2047067BD4F2C47D9BFD6$18.82
0.0067089 Eth
$5,401.35
292.258 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0025%
99
Crypto.com Exchange
LINK-BTC$18.78
0.0066948 Eth
$3,666.38
195.240 LINK
0.0017%
100
Ace
LINK-USDT$18.68
0.0066661 Eth
$1,822.06
99.680 LINK
0.0008%

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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