ETH Price: $2,488.18 (-0.44%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

722,342 ( -0.005%)

Market

Price

$11.15 @ 0.004481 ETH (-0.87%)

Onchain Market Cap

$11,150,000,000.00

Circulating Supply Market Cap

$6,991,141,921.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
45.70438646 LINK

Value
$509.60 ( ~0.204807942115974 Eth) [0.0000%]
0x612834070d70661806921eb1cac0b350c4d94a72
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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 10036.36% |ETH 0.0003846 1065.11%

Market

Volume (24H):$383,729,385.00
Market Capitalization:$6,991,141,921.00
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
WhiteBIT
LINK-USDT$11.16
0.0044899 Eth
$25,125,848.00
2,251,656.050 LINK
16.4733%
2
Bitget
LINK-USDT$11.17
0.0044901 Eth
$9,128,432.00
810,973.201 LINK
5.9331%
3
Bybit
LINK-USDT$11.18
0.0044935 Eth
$8,707,252.00
773,728.033 LINK
5.6607%
4
Coinbase Exchange
LINK-USD$11.16
0.0044947 Eth
$8,540,477.00
765,138.640 LINK
5.5978%
5
BTSE
LINK-USDT$11.16
0.0044909 Eth
$6,732,790.00
603,529.575 LINK
4.4155%
6
Slex
LINK-USDT$11.16
0.0044922 Eth
$5,420,869.00
480,878.950 LINK
3.5182%
7
P2B
LINK-USDT$11.16
0.0044909 Eth
$5,368,592.00
481,238.830 LINK
3.5208%
8
Ourbit
LINK-USDT$11.17
0.0044891 Eth
$5,107,014.00
453,585.200 LINK
3.3185%
9
OKX
LINK-USDT$11.18
0.0044954 Eth
$4,999,439.00
443,780.870 LINK
3.2467%
10
WEEX
LINK-USDT$11.16
0.0044831 Eth
$4,775,924.00
423,830.200 LINK
3.1008%
11
Gate.io
LINK-USDT$11.16
0.0044873 Eth
$4,706,219.00
416,181.440 LINK
3.0448%
12
Azbit
LINK-USDT$11.17
0.0044916 Eth
$3,973,569.00
353,361.520 LINK
2.5852%
13
Biconomy.com
LINK-USDT$11.17
0.0044847 Eth
$3,739,929.00
332,101.770 LINK
2.4297%
14
BVOX
LINK-USDT$11.14
0.0044862 Eth
$3,529,429.00
313,330.770 LINK
2.2924%
15
Crypto.com Exchange
LINK-USDT$11.16
0.0044883 Eth
$3,502,941.00
314,023.390 LINK
2.2974%
16
DigiFinex
LINK-USDT$11.17
0.0044906 Eth
$3,463,852.00
310,086.350 LINK
2.2686%
17
FameEX
LINK-USDT$11.16
0.0044868 Eth
$3,064,351.00
272,510.159 LINK
1.9937%
18
Deepcoin
LINK-USDT$11.16
0.0044921 Eth
$2,619,005.00
284,498.820 LINK
2.0814%
19
XT.COM
LINK-USDT$11.18
0.0044950 Eth
$2,595,717.00
230,908.750 LINK
1.6893%
20
Hotcoin
LINK-USDT$11.14
0.0044796 Eth
$2,594,670.00
233,012.790 LINK
1.7047%
21
Bitunix
LINK-USDT$11.16
0.0044943 Eth
$2,530,561.00
226,834.520 LINK
1.6595%
22
CoinW
LINK-USDT$11.15
0.0044918 Eth
$2,016,809.00
180,802.230 LINK
1.3228%
23
ProBit Global
LINK-USDT$11.16
0.0044922 Eth
$1,784,711.00
159,854.083 LINK
1.1695%
24
AscendEX (BitMax)
LINK-USDT$11.18
0.0044927 Eth
$1,706,166.00
152,673.900 LINK
1.1170%
25
Coinstore
LINK-USDT$11.15
0.0044875 Eth
$1,698,324.00
151,192.490 LINK
1.1061%
26
LBank
LINK-USDT$11.16
0.0044910 Eth
$1,697,545.00
152,172.640 LINK
1.1133%
27
KuCoin
LINK-USDT$11.17
0.0044901 Eth
$1,628,589.00
145,818.605 LINK
1.0668%
28
BYDFi
LINK-USDT$11.17
0.0044864 Eth
$1,503,561.00
134,604.320 LINK
0.9848%
29
WhiteBIT
LINK-BTC$11.15
0.0044904 Eth
$1,483,227.00
132,977.680 LINK
0.9729%
30
Niza Global
LINK-USD$11.16
0.0044903 Eth
$1,381,518.00
123,020.611 LINK
0.9000%
31
Kraken
LINK-USD$11.18
0.0044930 Eth
$1,373,501.00
122,892.398 LINK
0.8991%
32
Bullish
LINK-USDC$11.16
0.0044917 Eth
$1,301,230.00
115,503.934 LINK
0.8450%
33
Trubit
LINK-USDT$11.16
0.0044900 Eth
$1,294,806.00
114,564.690 LINK
0.8382%
34
HashKey Global
LINK-USDT$11.15
0.0044886 Eth
$909,645.00
80,634.615 LINK
0.5899%
35
Dex-Trade
LINK-USDT$11.17
0.0044907 Eth
$845,295.00
75,696.140 LINK
0.5538%
36
Azbit
LINK-ETH$11.16
0.0044936 Eth
$730,462.00
65,416.491 LINK
0.4786%
37
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$11.17
0.0044915 Eth
$567,950.00
50,739.817 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.3712%
38
Bitvavo
LINK-EUR$11.21
0.0045144 Eth
$539,994.00
48,153.559 LINK
0.3523%
39
EXMO
LINK-USDT$11.17
0.0044934 Eth
$526,640.00
47,132.338 LINK
0.3448%
40
LATOKEN
LINK-USDT$11.17
0.0044950 Eth
$500,653.00
44,838.227 LINK
0.3280%
41
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$11.16
0.0044894 Eth
$446,522.00
40,003.223 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.2927%
42
PointPay
LINK-USDT$11.16
0.0044910 Eth
$433,964.00
38,601.960 LINK
0.2824%
43
Coinbase Exchange
LINK-USDT$11.12
0.0044763 Eth
$401,832.00
36,147.981 LINK
0.2645%
44
BigONE
LINK-USDT$11.13
0.0044693 Eth
$388,403.00
34,884.710 LINK
0.2552%
45
Bybit
LINK-USDC$11.17
0.0044912 Eth
$385,727.00
34,193.133 LINK
0.2502%
46
CoinEx
LINK-USDT$11.16
0.0044914 Eth
$358,182.00
31,766.193 LINK
0.2324%
47
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$11.10
0.0044653 Eth
$355,917.00
31,789.823 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.2326%
48
LATOKEN
LINK-BTC$11.13
0.0044824 Eth
$333,821.00
29,980.771 LINK
0.2193%
49
WhiteBIT
LINK-EUR$11.18
0.0044950 Eth
$326,563.00
29,205.930 LINK
0.2137%
50
ProBit Global
LINK-BTC$11.16
0.0044876 Eth
$296,576.00
26,576.425 LINK
0.1944%
51
Phemex
LINK-USDT$11.17
0.0044950 Eth
$264,705.00
23,707.630 LINK
0.1734%
52
WhiteBIT
LINK-TRY$11.27
0.0045286 Eth
$255,159.00
22,650.520 LINK
0.1657%
53
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$11.12
0.0044709 Eth
$204,041.00
18,196.960 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1331%
54
BitMart
LINK-BTC$11.16
0.0044897 Eth
$195,540.00
17,524.080 LINK
0.1282%
55
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$11.17
0.0044923 Eth
$166,906.00
14,940.266 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1093%
56
Binance
LINK-EUR$11.22
0.0045101 Eth
$162,135.00
14,352.080 LINK
0.1050%
57
BitDelta
LINK-USDT$11.17
0.0044950 Eth
$148,907.00
13,212.000 LINK
0.0967%
58
OKX
LINK-USDC$11.15
0.0044818 Eth
$138,242.00
12,283.377 LINK
0.0899%
59
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$11.18
0.0044975 Eth
$133,816.00
11,908.175 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0871%
60
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$11.14
0.0044813 Eth
$129,039.00
11,571.564 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0847%
61
Coinbase Exchange
LINK-EUR$11.21
0.0045130 Eth
$127,264.00
11,355.290 LINK
0.0831%
62
BYDFi
LINK-USDC$11.16
0.0044828 Eth
$113,813.00
10,197.210 LINK
0.0746%
63
Gemini
LINK-USD$11.16
0.0044886 Eth
$107,552.00
9,636.412 LINK
0.0705%
64
Slex
LINK-BTC$11.16
0.0044940 Eth
$100,101.00
8,921.900 LINK
0.0653%
65
GMO Japan
LINK-JPY$11.17
0.0044935 Eth
$97,323.00
8,710.400 LINK
0.0637%
66
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$11.18
0.0044960 Eth
$95,901.00
96,826.757 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.7084%
67
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$11.09
0.0044672 Eth
$65,419.00
66,387.101 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.4857%
68
PointPay
LINK-BTC$11.15
0.0044894 Eth
$64,281.00
5,727.284 LINK
0.0419%
69
Slex
LINK-ETH$11.17
0.0044965 Eth
$55,509.00
4,963.840 LINK
0.0363%
70
KuCoin
LINK-USDC$11.14
0.0044803 Eth
$47,225.00
4,237.541 LINK
0.0310%
71
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$11.16
0.0044878 Eth
$45,593.00
4,055.301 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0297%
72
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$11.07
0.0044533 Eth
$43,081.00
3,867.518 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0283%
73
Bitso
LINK-USD$11.15
0.0044903 Eth
$33,271.00
2,983.630 LINK
0.0218%
74
Bitcointry
LINK-USDT$11.16
0.0044887 Eth
$31,458.00
2,795.455 LINK
0.0205%
75
Coinbase Exchange
LINK-BTC$11.15
0.0044904 Eth
$30,185.00
2,706.820 LINK
0.0198%
76
Binance US
LINK-USDT$11.16
0.0044861 Eth
$29,143.00
2,611.528 LINK
0.0191%
77
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$11.18
0.0044978 Eth
$24,473.00
24,744.780 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.1810%
78
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$11.16
0.0044884 Eth
$22,523.00
1,993.394 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0146%
79
PancakeSwap V3 (BSC)
0X0E09FABB73BD3ADE0A17ECC321FD13A19E81CE82-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$11.14
0.0044809 Eth
$13,407.08
7,867.556 0X0E09FABB73BD3ADE0A17ECC321FD13A19E81CE82
0.0576%
80
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$11.19
0.0044999 Eth
$13,326.15
1,187.074 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0087%
81
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$11.10
0.0044653 Eth
$12,268.72
12,408.048 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.0908%
82
HTX
LINK-BTC$11.18
0.0044977 Eth
$10,010.71
887.070 LINK
0.0065%
83
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$11.17
0.0044923 Eth
$9,447.21
849.200 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0062%
84
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$11.16
0.0044894 Eth
$9,149.54
817.689 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0060%
85
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$11.17
0.0044907 Eth
$8,569.51
766.256 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0056%
86
THENA FUSION
0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$11.14
0.0044818 Eth
$7,540.88
12.246 0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827
0.0001%
87
LFJ
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$11.11
0.0044673 Eth
$6,617.17
606.790 0X5947BB275C521040051D82396192181B413227A3
0.0044%
88
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X1BFD67037B42CF73ACF2047067BD4F2C47D9BFD6$11.17
0.0044905 Eth
$4,013.67
356.907 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0026%
89
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X55D398326F99059FF775485246999027B3197955$11.13
0.0044740 Eth
$3,932.99
348.614 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0026%
90
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$11.12
0.0044729 Eth
$3,139.33
278.090 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0020%
91
CoinEx
LINK-BTC$11.14
0.0044825 Eth
$2,082.58
185.305 LINK
0.0014%
92
CoinEx
LINK-USDC$11.11
0.0044745 Eth
$2,039.16
180.938 LINK
0.0013%
93
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$11.08
0.0044628 Eth
$1,632.65
146.716 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0011%
94
CEX.IO
LINK-USDT$11.17
0.0044876 Eth
$1,235.29
108.832 LINK
0.0008%
95
Uniswap V3 (Optimism)
0X0B2C639C533813F4AA9D7837CAF62653D097FF85-0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6$11.07
0.0044521 Eth
$1,024.38
1,042.094 0X0B2C639C533813F4AA9D7837CAF62653D097FF85
0.0076%
96
Balancer V2 (Arbitrum)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$11.19
0.0045009 Eth
$965.89
86.140 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0006%
97
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFA7F8980B0F1E64A2062791CC3B0871572F1F7F0$11.11
0.0044679 Eth
$754.59
69.554 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0005%
98
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X8AC76A51CC950D9822D68B83FE1AD97B32CD580D$11.14
0.0044842 Eth
$659.73
58.506 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0004%
99
Uniswap V3 (Arbitrum One)
0X0C880F6761F1AF8D9AA9C466984B80DAB9A8C9E8-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$11.12
0.0044772 Eth
$638.46
136.275 0X0C880F6761F1AF8D9AA9C466984B80DAB9A8C9E8
0.0010%
100
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0XDA10009CBD5D07DD0CECC66161FC93D7C9000DA1$11.08
0.0044598 Eth
$149.98
13.323 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
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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