ETH Price: $2,518.88 (-5.12%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

722,452 ( 0.015%)

Market

Price

$11.48 @ 0.004558 ETH (-5.91%)

Onchain Market Cap

$11,480,000,000.00

Circulating Supply Market Cap

$7,199,175,497.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
6.23075576 LINK

Value
$71.53 ( ~0.0283974961376981 Eth) [0.0000%]
0x08fdeb402f3f244d7a945d29fe855e8200ac9298
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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 10336.36% |ETH 0.0003846 1085.13%

Market

Volume (24H):$442,469,381.00
Market Capitalization:$7,199,175,497.00
Circulating Supply:626,849,971.00 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$11.46
0.0045525 Eth
$33,190,930.00
2,754,584.320 LINK
15.5179%
2
WhiteBIT
LINK-USDT$11.47
0.0045597 Eth
$28,633,603.00
2,497,294.400 LINK
14.0685%
3
Coinbase Exchange
LINK-USD$11.47
0.0045614 Eth
$16,989,325.00
1,480,680.190 LINK
8.3414%
4
HTX
LINK-USDT$11.47
0.0045627 Eth
$13,065,477.00
1,080,666.123 LINK
6.0879%
5
Bitget
LINK-USDT$11.48
0.0045636 Eth
$9,587,095.00
793,442.234 LINK
4.4699%
6
Bybit
LINK-USDT$11.46
0.0045580 Eth
$9,249,890.00
768,137.668 LINK
4.3273%
7
BTSE
LINK-USDT$11.48
0.0045644 Eth
$7,520,064.00
655,189.681 LINK
3.6910%
8
OKX
LINK-USDT$11.47
0.0045604 Eth
$6,807,114.00
566,780.795 LINK
3.1930%
9
Gate.io
LINK-USDT$11.47
0.0045586 Eth
$6,379,149.00
532,658.890 LINK
3.0007%
10
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$11.40
0.0045348 Eth
$5,834,982.00
503,320.003 0X514910771AF9CA656AF840DFF83E8264ECF986CA
2.8355%
11
P2B
LINK-USDT$11.45
0.0045548 Eth
$5,533,163.00
483,116.760 LINK
2.7216%
12
Slex
LINK-USDT$11.52
0.0045557 Eth
$5,476,160.00
453,556.950 LINK
2.5551%
13
Azbit
LINK-USDT$11.46
0.0045548 Eth
$5,059,281.00
418,347.420 LINK
2.3568%
14
DigiFinex
LINK-USDT$11.47
0.0045607 Eth
$4,292,248.00
374,283.280 LINK
2.1085%
15
Biconomy.com
LINK-USDT$11.48
0.0045636 Eth
$3,932,741.00
325,835.870 LINK
1.8356%
16
XT.COM
LINK-USDT$11.47
0.0045489 Eth
$3,322,095.00
276,066.840 LINK
1.5552%
17
Bitunix
LINK-USDT$11.48
0.0045622 Eth
$3,100,372.00
270,181.550 LINK
1.5221%
18
CoinW
LINK-USDT$11.47
0.0045527 Eth
$2,921,519.00
254,669.040 LINK
1.4347%
19
ProBit Global
LINK-USDT$11.47
0.0045584 Eth
$2,698,792.00
235,362.156 LINK
1.3259%
20
Coinstore
LINK-USDT$11.47
0.0045596 Eth
$2,381,638.00
197,429.770 LINK
1.1122%
21
Trubit
LINK-USDT$11.47
0.0045487 Eth
$2,241,157.00
187,134.320 LINK
1.0542%
22
KuCoin
LINK-USDT$11.45
0.0045548 Eth
$2,097,721.00
183,158.188 LINK
1.0318%
23
LBank
LINK-USDT$11.44
0.0045509 Eth
$2,048,293.00
178,998.540 LINK
1.0084%
24
Binance
LINK-FDUSD$11.50
0.0045584 Eth
$1,755,962.00
145,024.540 LINK
0.8170%
25
AscendEX (BitMax)
LINK-USDT$11.45
0.0045544 Eth
$1,644,402.00
143,589.900 LINK
0.8089%
26
BYDFi
LINK-USDT$11.51
0.0045619 Eth
$1,491,989.00
129,608.660 LINK
0.7301%
27
WhiteBIT
LINK-BTC$11.47
0.0045622 Eth
$1,474,285.00
128,485.410 LINK
0.7238%
28
CoinEx
LINK-USDT$11.46
0.0045595 Eth
$1,085,393.00
90,038.622 LINK
0.5072%
29
Bitvavo
LINK-EUR$11.46
0.0045587 Eth
$1,026,959.00
89,590.953 LINK
0.5047%
30
HashKey Global
LINK-USDT$11.47
0.0045580 Eth
$1,004,878.00
83,521.348 LINK
0.4705%
31
Dex-Trade
LINK-USDT$11.47
0.0045620 Eth
$1,003,351.00
87,468.060 LINK
0.4928%
32
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$11.42
0.0045416 Eth
$985,744.00
85,144.672 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.4797%
33
Azbit
LINK-ETH$11.47
0.0045587 Eth
$858,517.00
74,059.350 LINK
0.4172%
34
LATOKEN
LINK-BTC$11.47
0.0045581 Eth
$619,617.00
54,040.193 LINK
0.3044%
35
LATOKEN
LINK-USDT$11.46
0.0045560 Eth
$613,540.00
53,534.434 LINK
0.3016%
36
EXMO
LINK-USDT$11.48
0.0045637 Eth
$587,647.00
51,197.491 LINK
0.2884%
37
BigONE
LINK-USDT$11.49
0.0045678 Eth
$561,084.00
48,838.990 LINK
0.2751%
38
PointPay
LINK-USDT$11.47
0.0045603 Eth
$551,430.00
45,762.953 LINK
0.2578%
39
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$11.51
0.0045778 Eth
$519,530.00
44,744.750 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.2521%
40
ProBit Global
LINK-BTC$11.47
0.0045617 Eth
$467,528.00
40,757.772 LINK
0.2296%
41
tanX
LINK-USDC$11.49
0.0045590 Eth
$395,721.00
32,602.780 LINK
0.1837%
42
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$11.52
0.0045827 Eth
$394,150.00
33,951.709 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1913%
43
Bybit
LINK-USDC$11.45
0.0045542 Eth
$364,032.00
30,094.110 LINK
0.1695%
44
Phemex
LINK-USDT$11.46
0.0045588 Eth
$331,551.00
28,923.490 LINK
0.1629%
45
Gemini
LINK-USD$11.45
0.0045528 Eth
$330,516.00
28,871.050 LINK
0.1626%
46
EarnBIT
LINK-USDT$11.40
0.0045332 Eth
$319,655.00
26,750.786 LINK
0.1507%
47
WhiteBIT
LINK-EUR$11.53
0.0045697 Eth
$308,404.00
26,748.070 LINK
0.1507%
48
WhiteBIT
LINK-TRY$11.51
0.0045760 Eth
$289,802.00
25,184.980 LINK
0.1419%
49
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$11.47
0.0045607 Eth
$251,327.00
21,300.536 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1200%
50
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$11.53
0.0045843 Eth
$227,440.00
19,253.403 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.1085%
51
Bitbank
LINK-JPY$11.51
0.0045772 Eth
$226,370.00
19,668.236 LINK
0.1108%
52
Binance
LINK-TRY$11.51
0.0045787 Eth
$204,498.00
16,780.250 LINK
0.0945%
53
AscendEX (BitMax)
LINK-USD$11.45
0.0045547 Eth
$200,364.00
17,494.800 LINK
0.0986%
54
BitMart
LINK-BTC$11.48
0.0045650 Eth
$185,631.00
16,165.180 LINK
0.0911%
55
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$11.42
0.0045426 Eth
$185,365.00
16,013.873 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0902%
56
Bitso
LINK-USD$11.52
0.0045612 Eth
$181,783.00
15,782.903 LINK
0.0889%
57
Slex
LINK-BTC$11.45
0.0045526 Eth
$178,196.00
15,026.600 LINK
0.0847%
58
OKX
LINK-USDC$11.46
0.0045582 Eth
$162,159.00
13,487.882 LINK
0.0760%
59
BitDelta
LINK-USDT$11.48
0.0045642 Eth
$161,527.00
13,376.000 LINK
0.0754%
60
BYDFi
LINK-USDC$11.47
0.0045562 Eth
$156,400.00
13,634.940 LINK
0.0768%
61
Coinbase Exchange
LINK-GBP$11.47
0.0045600 Eth
$149,711.00
13,056.940 LINK
0.0736%
62
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$11.46
0.0045574 Eth
$143,200.00
149,730.192 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.8435%
63
Bitci TR
LINK-TRY$11.45
0.0045532 Eth
$125,346.00
10,336.072 LINK
0.0582%
64
PointPay
LINK-BTC$11.48
0.0045538 Eth
$117,690.00
9,911.135 LINK
0.0558%
65
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$11.46
0.0045556 Eth
$111,348.00
9,195.724 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0518%
66
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$11.42
0.0045416 Eth
$106,477.00
111,595.755 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.6287%
67
GMO Japan
LINK-JPY$11.45
0.0045528 Eth
$98,678.00
8,616.400 LINK
0.0485%
68
Slex
LINK-ETH$11.50
0.0045635 Eth
$96,146.00
8,273.670 LINK
0.0466%
69
Binance US
LINK-USDT$11.46
0.0045552 Eth
$93,387.00
8,150.226 LINK
0.0459%
70
XT.COM
LINK-BTC$11.48
0.0045541 Eth
$76,843.00
6,525.420 LINK
0.0368%
71
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$11.51
0.0045780 Eth
$58,947.00
4,923.546 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0277%
72
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$11.46
0.0045572 Eth
$55,413.00
4,617.336 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0260%
73
BitStorage
LINK-ETH$11.47
0.0045604 Eth
$52,251.00
4,554.700 LINK
0.0257%
74
Kanga
LINK-PLN$11.47
0.0045624 Eth
$46,601.00
0.000 LINK
0.0000%
75
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$11.46
0.0045572 Eth
$45,100.00
3,740.162 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0211%
76
Mercado Bitcoin
LINK-BRL$11.53
0.0045836 Eth
$40,911.00
3,548.272 LINK
0.0200%
77
KuCoin
LINK-KCS$11.49
0.0045706 Eth
$35,405.00
3,080.667 LINK
0.0174%
78
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$11.47
0.0045619 Eth
$34,458.00
2,970.161 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0167%
79
Bitcointry
LINK-USDT$11.45
0.0045529 Eth
$33,988.00
2,822.142 LINK
0.0159%
80
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$11.52
0.0045827 Eth
$33,867.00
35,177.794 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.1982%
81
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$11.44
0.0045513 Eth
$29,491.00
2,501.329 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0141%
82
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$11.51
0.0045582 Eth
$29,161.00
2,517.508 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0142%
83
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$11.42
0.0045416 Eth
$21,679.00
22,936.545 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.1292%
84
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$11.46
0.0045572 Eth
$20,092.00
1,704.256 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0096%
85
Nonkyc.io
LINK-BTC$11.42
0.0045386 Eth
$19,279.80
1,627.130 LINK
0.0092%
86
THENA FUSION
0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$11.51
0.0045783 Eth
$15,691.59
25.683 0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827
0.0001%
87
Pangolin
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$11.43
0.0045463 Eth
$14,769.75
1,282.138 0X5947BB275C521040051D82396192181B413227A3
0.0072%
88
PancakeSwap V3 (BSC)
0X0E09FABB73BD3ADE0A17ECC321FD13A19E81CE82-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$11.53
0.0045843 Eth
$14,166.95
8,250.667 0X0E09FABB73BD3ADE0A17ECC321FD13A19E81CE82
0.0465%
89
LFJ
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$11.50
0.0045718 Eth
$13,507.99
1,171.022 0X5947BB275C521040051D82396192181B413227A3
0.0066%
90
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X1BFD67037B42CF73ACF2047067BD4F2C47D9BFD6$11.45
0.0045554 Eth
$12,978.35
1,097.068 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0062%
91
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XD93F7E271CB87C23AAA73EDC008A79646D1F9912$11.45
0.0045517 Eth
$12,474.14
1,070.765 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0060%
92
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$11.53
0.0045762 Eth
$12,346.06
1,060.186 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0060%
93
Coins.ph
LINK-PHP$11.50
0.0045714 Eth
$8,088.94
670.666 LINK
0.0038%
94
PancakeSwap V3 (BSC)
0X0E09FABB73BD3ADE0A17ECC321FD13A19E81CE82-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$11.53
0.0045843 Eth
$7,881.80
4,569.543 0X0E09FABB73BD3ADE0A17ECC321FD13A19E81CE82
0.0257%
95
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X55D398326F99059FF775485246999027B3197955$11.54
0.0045876 Eth
$6,513.14
541.231 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0030%
96
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XDAC17F958D2EE523A2206206994597C13D831EC7$11.40
0.0045348 Eth
$5,746.03
494.425 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0028%
97
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$11.52
0.0045714 Eth
$5,515.72
457.426 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0026%
98
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$11.51
0.0045729 Eth
$4,345.32
376.527 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0021%
99
CoinEx
LINK-BTC$11.50
0.0045678 Eth
$4,084.11
344.451 LINK
0.0019%
100
Uniswap V3 (Ethereum)
0X7FC66500C84A76AD7E9C93437BFC5AC33E2DDAE9-0X514910771AF9CA656AF840DFF83E8264ECF986CA$11.41
0.0045364 Eth
$3,548.89
24.761 0X7FC66500C84A76AD7E9C93437BFC5AC33E2DDAE9
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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