ETH Price: $3,640.20 (+1.11%)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

729,352 ( 0.005%)

Market

Price

$23.68 @ 0.006505 ETH (+0.15%)

Onchain Market Cap

$23,680,000,000.00

Circulating Supply Market Cap

$14,946,865,334.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
59.71127208 LINK

Value
$1,413.96 ( ~0.388429159979569 Eth) [0.0000%]
0x40af7345d6606fa9773797db66096f4607b2d040
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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 21427.27% |ETH 0.0003846 1591.37%

Market

Volume (24H):$832,033,184.00
Market Capitalization:$14,946,865,334.00
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
Coinbase Exchange
LINK-USD$23.67
0.0065097 Eth
$27,329,584.00
1,154,852.500 LINK
10.5427%
2
Slex
LINK-USDT$23.64
0.0065040 Eth
$23,357,710.00
1,001,191.970 LINK
9.1400%
3
P2B
LINK-USDT$23.67
0.0065219 Eth
$18,454,820.00
779,784.210 LINK
7.1187%
4
Bybit
LINK-USDT$23.67
0.0065111 Eth
$17,714,723.00
757,886.559 LINK
6.9188%
5
MEXC
LINK-USDT$23.66
0.0065074 Eth
$17,707,404.00
748,489.940 LINK
6.8330%
6
CoinW
LINK-USDT$23.65
0.0065054 Eth
$16,237,501.00
686,443.220 LINK
6.2666%
7
OKX
LINK-USDT$23.64
0.0065006 Eth
$12,076,195.00
516,676.524 LINK
4.7168%
8
HTX
LINK-USDT$23.67
0.0065082 Eth
$9,384,388.00
402,388.645 LINK
3.6734%
9
XT.COM
LINK-USDT$23.67
0.0065102 Eth
$8,657,428.00
370,780.780 LINK
3.3849%
10
Coinstore
LINK-USDT$23.70
0.0065198 Eth
$7,864,214.00
336,818.600 LINK
3.0748%
11
Binance
LINK-FDUSD$23.65
0.0065026 Eth
$6,921,412.00
296,619.540 LINK
2.7079%
12
Biconomy.com
LINK-USDT$23.65
0.0065074 Eth
$6,379,658.00
273,262.940 LINK
2.4946%
13
Bithumb
LINK-KRW$23.85
0.0065607 Eth
$5,975,232.00
250,496.961 LINK
2.2868%
14
BYDFi
LINK-USDT$23.68
0.0065142 Eth
$5,751,944.00
242,941.220 LINK
2.2178%
15
Azbit
LINK-USDT$23.66
0.0065189 Eth
$5,543,312.00
236,770.324 LINK
2.1615%
16
Kraken
LINK-USD$23.67
0.0065097 Eth
$5,114,813.00
216,085.513 LINK
1.9727%
17
LATOKEN
LINK-USDT$23.65
0.0065026 Eth
$4,226,294.00
178,715.075 LINK
1.6315%
18
Dex-Trade
LINK-USDT$23.63
0.0065060 Eth
$2,860,439.00
121,062.920 LINK
1.1052%
19
KuCoin
LINK-USDT$23.66
0.0065073 Eth
$2,674,027.00
113,012.018 LINK
1.0317%
20
CoinEx
LINK-USDT$23.69
0.0065181 Eth
$2,537,571.00
108,558.709 LINK
0.9910%
21
Hotcoin
LINK-USDT$23.72
0.0065263 Eth
$2,385,401.00
100,581.310 LINK
0.9182%
22
Bitvavo
LINK-EUR$23.70
0.0065202 Eth
$2,385,361.00
100,657.106 LINK
0.9189%
23
Coinbase Exchange
LINK-BTC$23.65
0.0065034 Eth
$2,101,579.00
88,880.130 LINK
0.8114%
24
Dcoin
LINK-USDT$23.67
0.0065122 Eth
$1,791,666.00
75,678.000 LINK
0.6909%
25
EXMO
LINK-USDT$23.66
0.0065084 Eth
$1,221,029.00
51,608.544 LINK
0.4711%
26
PointPay
LINK-USDT$23.65
0.0065067 Eth
$1,089,509.00
46,708.100 LINK
0.4264%
27
tanX
LINK-USDC$23.67
0.0065098 Eth
$1,083,461.00
46,365.580 LINK
0.4233%
28
Phemex
LINK-USDT$23.67
0.0065103 Eth
$1,064,564.00
44,982.030 LINK
0.4106%
29
Bybit
LINK-USDC$23.67
0.0065099 Eth
$995,673.00
42,465.292 LINK
0.3877%
30
Bitbank
LINK-JPY$23.70
0.0065193 Eth
$904,789.00
38,177.024 LINK
0.3485%
31
Coinbase Exchange
LINK-EUR$23.65
0.0065068 Eth
$852,845.00
36,054.110 LINK
0.3291%
32
Trubit
LINK-USDT$23.67
0.0065109 Eth
$823,528.00
35,316.280 LINK
0.3224%
33
WhiteBIT
LINK-BTC$23.65
0.0065065 Eth
$815,706.00
34,490.120 LINK
0.3149%
34
WhiteBIT
LINK-TRY$23.70
0.0065203 Eth
$720,080.00
30,382.410 LINK
0.2774%
35
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$23.65
0.0065054 Eth
$687,592.00
29,300.352 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.2675%
36
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$23.58
0.0064874 Eth
$647,610.00
42,433.556 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.3874%
37
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$23.60
0.0064928 Eth
$627,337.00
26,660.348 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.2434%
38
EarnBIT
LINK-USDT$23.59
0.0065012 Eth
$562,430.00
24,096.004 LINK
0.2200%
39
Coinbase Exchange
LINK-GBP$23.69
0.0065168 Eth
$477,792.00
20,167.950 LINK
0.1841%
40
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$23.73
0.0065262 Eth
$473,493.00
20,126.001 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1837%
41
itBit
LINK-USD$23.66
0.0065081 Eth
$465,418.00
19,671.081 LINK
0.1796%
42
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$23.61
0.0064955 Eth
$428,839.00
18,424.826 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.1682%
43
Slex
LINK-ETH$23.65
0.0065077 Eth
$423,710.00
18,045.220 LINK
0.1647%
44
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$23.62
0.0064981 Eth
$414,877.00
410,738.386 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
3.7497%
45
Bitbegin
LINK-USDT$23.68
0.0065137 Eth
$410,720.00
17,586.994 LINK
0.1606%
46
BigONE
LINK-USDT$23.74
0.0065279 Eth
$391,063.00
16,475.270 LINK
0.1504%
47
Binance
LINK-TRY$23.74
0.0065233 Eth
$361,690.00
15,492.030 LINK
0.1414%
48
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$23.65
0.0065052 Eth
$356,667.00
15,141.294 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1382%
49
Gemini
LINK-USD$23.63
0.0064981 Eth
$320,427.00
13,562.561 LINK
0.1238%
50
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$23.58
0.0064874 Eth
$292,365.00
12,492.722 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.1140%
51
BitMart
LINK-BTC$23.66
0.0065064 Eth
$287,012.00
12,129.600 LINK
0.1107%
52
GMO Japan
LINK-JPY$23.58
0.0064852 Eth
$265,150.00
11,246.700 LINK
0.1027%
53
Bitci TR
LINK-TRY$23.85
0.0065606 Eth
$241,141.00
10,348.710 LINK
0.0945%
54
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$23.73
0.0065262 Eth
$236,195.00
232,807.443 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
2.1253%
55
Coinbase Exchange
LINK-ETH$23.67
0.0065121 Eth
$222,583.00
9,402.340 LINK
0.0858%
56
LATOKEN
LINK-BTC$23.69
0.0065187 Eth
$206,011.00
8,694.424 LINK
0.0794%
57
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$23.53
0.0064715 Eth
$202,781.00
8,679.057 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0792%
58
OKX
LINK-USDC$23.66
0.0065069 Eth
$191,186.00
8,184.772 LINK
0.0747%
59
Binance US
LINK-USDT$23.67
0.0065239 Eth
$160,863.00
6,795.550 LINK
0.0620%
60
CoinEx
LINK-USDC$23.71
0.0065239 Eth
$159,716.00
6,931.764 LINK
0.0633%
61
Bitexen
LINK-TRY$23.46
0.0064531 Eth
$151,622.00
6,463.159 LINK
0.0590%
62
PointPay
LINK-BTC$23.66
0.0065069 Eth
$147,053.00
6,293.651 LINK
0.0575%
63
Bitkub
LINK-THB$23.47
0.0064597 Eth
$144,377.00
6,152.466 LINK
0.0562%
64
BitStorage
LINK-ETH$23.67
0.0065086 Eth
$140,843.00
5,950.910 LINK
0.0543%
65
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$23.75
0.0065324 Eth
$129,418.00
5,517.953 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0504%
66
Bitso
LINK-USD$23.68
0.0065125 Eth
$125,129.00
5,284.541 LINK
0.0482%
67
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$23.66
0.0065062 Eth
$124,544.00
5,291.334 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0483%
68
BTCMarkets
LINK-AUD$23.67
0.0065241 Eth
$119,755.00
5,058.440 LINK
0.0462%
69
BitMart
LINK-ETH$23.64
0.0065012 Eth
$97,115.00
4,108.220 LINK
0.0375%
70
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$23.69
0.0065165 Eth
$95,723.00
4,067.947 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0371%
71
EXMO
LINK-BTC$23.70
0.0065194 Eth
$95,124.00
4,013.768 LINK
0.0366%
72
Hotcoin
LINK-BTC$23.69
0.0065194 Eth
$83,021.00
3,504.290 LINK
0.0320%
73
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$23.67
0.0065104 Eth
$73,887.00
72,974.831 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.6662%
74
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$23.73
0.0065262 Eth
$66,843.00
2,857.426 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0261%
75
Independent Reserve
LINK-AUD$23.67
0.0065091 Eth
$58,801.00
2,484.392 LINK
0.0227%
76
CoinEx
LINK-BTC$23.68
0.0065159 Eth
$52,256.00
2,216.796 LINK
0.0202%
77
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$23.69
0.0065153 Eth
$44,976.00
1,917.018 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0175%
78
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$23.65
0.0065036 Eth
$43,457.00
1,848.109 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0169%
79
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$23.64
0.0065015 Eth
$33,445.00
1,817.256 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0166%
80
THENA FUSION
0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$23.62
0.0064967 Eth
$31,768.00
40.446 0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827
0.0004%
81
Korbit
LINK-KRW$23.91
0.0065757 Eth
$31,050.00
1,320.608 LINK
0.0121%
82
Hotcoin
LINK-ETH$23.67
0.0065097 Eth
$28,752.00
1,214.720 LINK
0.0111%
83
Gemini
LINK-BTC$23.56
0.0064799 Eth
$22,088.00
937.546 LINK
0.0086%
84
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XDAC17F958D2EE523A2206206994597C13D831EC7$23.55
0.0064796 Eth
$16,868.36
722.853 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0066%
85
Dex-Trade
LINK-ETH$23.64
0.0065019 Eth
$15,752.73
666.460 LINK
0.0061%
86
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$23.59
0.0064869 Eth
$14,974.73
639.134 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0058%
87
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X1BFD67037B42CF73ACF2047067BD4F2C47D9BFD6$23.73
0.0065249 Eth
$11,733.75
499.722 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0046%
88
Biswap V3
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$23.67
0.0065119 Eth
$7,990.70
342.722 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0031%
89
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$23.67
0.0065157 Eth
$7,871.16
7,753.897 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.0708%
90
KuCoin
LINK-KCS$23.55
0.0064761 Eth
$7,555.55
320.855 LINK
0.0029%
91
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$23.72
0.0065274 Eth
$6,294.81
6,204.784 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.0566%
92
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X55D398326F99059FF775485246999027B3197955$23.61
0.0064944 Eth
$4,516.92
193.140 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0018%
93
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XD6DF932A45C0F255F85145F286EA0B292B21C90B$23.73
0.0065262 Eth
$3,754.99
156.886 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0014%
94
Ace
LINK-USDT$23.61
0.0065031 Eth
$3,494.27
149.590 LINK
0.0014%
95
Uniswap V2 (Ethereum)
0X00B78238925C320159023C2AC9EF89DA8F16D007-0X514910771AF9CA656AF840DFF83E8264ECF986CA$23.68
0.0065146 Eth
$3,306.51
183,837.980 0X00B78238925C320159023C2AC9EF89DA8F16D007
1.6783%
96
PancakeSwap V3 (Arbitrum)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$23.65
0.0065070 Eth
$2,729.47
116.032 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0011%
97
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$23.73
0.0065258 Eth
$2,119.50
90.195 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0008%
98
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFA7F8980B0F1E64A2062791CC3B0871572F1F7F0$23.67
0.0065109 Eth
$1,606.64
67.811 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0006%
99
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$23.68
0.0065119 Eth
$1,151.27
48.974 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0004%
100
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X8AC76A51CC950D9822D68B83FE1AD97B32CD580D$23.66
0.0065147 Eth
$1,084.70
46.510 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0004%

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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