ETH Price: $3,268.31 (+1.41%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

725,715 ( 0.038%)

Market

Price

$20.27 @ 0.006202 ETH (+2.96%)

Onchain Market Cap

$20,270,000,000.00

Circulating Supply Market Cap

$12,809,178,192.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
0 LINK

Value
$0.00
0xb0dceb2903ea1a306a95732f278ae68ae97a1f4c
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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 18327.27% |ETH 0.0003846 1512.58%

Market

Volume (24H):$852,087,760.00
Market Capitalization:$12,809,178,192.00
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$20.27
0.0061975 Eth
$101,903,532.00
5,079,574.660 LINK
25.1952%
2
Coinbase Exchange
LINK-USD$20.27
0.0062035 Eth
$39,924,879.00
1,970,139.590 LINK
9.7721%
3
Bybit
LINK-USDT$20.29
0.0062097 Eth
$21,501,146.00
1,072,249.875 LINK
5.3185%
4
P2B
LINK-USDT$20.28
0.0062089 Eth
$18,249,998.00
899,832.790 LINK
4.4633%
5
Slex
LINK-USDT$20.29
0.0062118 Eth
$18,059,850.00
898,344.580 LINK
4.4559%
6
MEXC
LINK-USDT$20.28
0.0062014 Eth
$17,228,500.00
849,462.100 LINK
4.2134%
7
DigiFinex
LINK-USDT$20.29
0.0062090 Eth
$12,660,293.00
624,108.010 LINK
3.0956%
8
OKX
LINK-USDT$20.30
0.0062132 Eth
$11,570,628.00
576,266.209 LINK
2.8583%
9
HTX
LINK-USDT$20.27
0.0062036 Eth
$11,550,166.00
574,066.203 LINK
2.8474%
10
XT.COM
LINK-USDT$20.29
0.0062091 Eth
$10,177,945.00
507,056.670 LINK
2.5150%
11
Azbit
LINK-USDT$20.25
0.0061968 Eth
$9,993,236.00
498,054.262 LINK
2.4704%
12
Coinstore
LINK-USDT$20.25
0.0061978 Eth
$8,741,523.00
435,565.420 LINK
2.1604%
13
CoinW
LINK-USDT$20.28
0.0062030 Eth
$8,088,884.00
398,879.150 LINK
1.9785%
14
Hotcoin
LINK-USDT$20.29
0.0062109 Eth
$6,581,401.00
324,354.890 LINK
1.6088%
15
Binance
LINK-FDUSD$20.31
0.0062085 Eth
$6,191,456.00
308,089.940 LINK
1.5282%
16
PancakeSwap (v2)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$20.25
0.0061996 Eth
$6,032,055.00
36,917.565 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.1831%
17
BYDFi
LINK-USDT$20.26
0.0061980 Eth
$5,747,799.00
283,658.130 LINK
1.4070%
18
Binance
LINK-USDC$20.28
0.0062002 Eth
$5,261,349.00
261,633.850 LINK
1.2977%
19
LBank
LINK-USDT$20.27
0.0061973 Eth
$5,056,683.00
249,491.340 LINK
1.2375%
20
LATOKEN
LINK-USDT$20.25
0.0061966 Eth
$5,016,781.00
247,762.182 LINK
1.2289%
21
KuCoin
LINK-USDT$20.26
0.0062002 Eth
$4,896,845.00
241,737.327 LINK
1.1990%
22
QMall
LINK-USDT$20.33
0.0062117 Eth
$4,182,501.00
208,501.434 LINK
1.0342%
23
Kraken
LINK-USD$20.29
0.0062108 Eth
$4,081,555.00
201,144.551 LINK
0.9977%
24
BTSE
LINK-USDT$20.25
0.0061910 Eth
$3,982,530.00
196,661.885 LINK
0.9755%
25
Dex-Trade
LINK-USDT$20.28
0.0062065 Eth
$3,252,666.00
160,417.570 LINK
0.7957%
26
FMCPAY
LINK-USDT$20.28
0.0062082 Eth
$2,184,401.00
108,689.984 LINK
0.5391%
27
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$20.24
0.0061942 Eth
$1,986,742.00
99,079.001 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.4914%
28
Biconomy.com
LINK-USDT$20.25
0.0061978 Eth
$1,899,738.00
94,465.250 LINK
0.4686%
29
Coinbase Exchange
LINK-GBP$20.25
0.0061968 Eth
$1,698,876.00
83,898.640 LINK
0.4161%
30
PointPay
LINK-USDT$20.26
0.0061999 Eth
$1,607,622.00
80,050.654 LINK
0.3971%
31
CoinEx
LINK-USDT$20.29
0.0062076 Eth
$1,607,345.00
79,733.542 LINK
0.3955%
32
Coinbase Exchange
LINK-EUR$20.29
0.0062085 Eth
$1,605,840.00
79,154.690 LINK
0.3926%
33
Bitvavo
LINK-EUR$20.31
0.0062112 Eth
$1,335,182.00
65,733.709 LINK
0.3260%
34
EXMO
LINK-USDT$20.25
0.0061995 Eth
$1,219,819.00
60,224.048 LINK
0.2987%
35
FMCPAY
LINK-ETH$20.29
0.0062031 Eth
$1,184,766.00
58,850.080 LINK
0.2919%
36
Phemex
LINK-USDT$20.31
0.0062155 Eth
$1,125,299.00
55,417.470 LINK
0.2749%
37
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$20.17
0.0061755 Eth
$1,121,977.00
55,876.608 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.2772%
38
Bybit
LINK-USDC$20.29
0.0062093 Eth
$1,020,135.00
50,767.607 LINK
0.2518%
39
BigONE
LINK-USDT$20.25
0.0061973 Eth
$988,889.00
48,842.820 LINK
0.2423%
40
Coinbase Exchange
LINK-USDT$20.26
0.0062017 Eth
$962,344.00
47,497.917 LINK
0.2356%
41
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$20.21
0.0061867 Eth
$927,529.00
46,173.801 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.2290%
42
Tokpie
LINK-USDT$20.33
0.0062185 Eth
$862,865.00
42,433.899 LINK
0.2105%
43
Trubit
LINK-USDT$20.30
0.0062124 Eth
$817,846.00
40,668.620 LINK
0.2017%
44
Bitbank
LINK-JPY$20.35
0.0062281 Eth
$794,234.00
39,034.809 LINK
0.1936%
45
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$20.23
0.0061940 Eth
$769,949.00
38,143.079 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1892%
46
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$20.16
0.0061724 Eth
$766,202.00
38,198.715 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.1895%
47
tanX
LINK-USDC$20.28
0.0062091 Eth
$763,875.00
37,919.240 LINK
0.1881%
48
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$20.23
0.0061932 Eth
$676,440.00
49,844.708 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.2472%
49
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$20.24
0.0061954 Eth
$624,260.00
618,991.407 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
3.0703%
50
Coinbase Exchange
LINK-ETH$20.26
0.0062003 Eth
$616,089.00
30,413.110 LINK
0.1509%
51
OKX
LINK-USDC$20.24
0.0061939 Eth
$588,871.00
29,358.195 LINK
0.1456%
52
EarnBIT
LINK-USDT$20.26
0.0061986 Eth
$544,275.00
27,112.403 LINK
0.1345%
53
Bitbegin
LINK-USDT$20.26
0.0062005 Eth
$486,865.00
24,203.924 LINK
0.1201%
54
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$20.23
0.0061918 Eth
$485,986.00
24,227.568 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1202%
55
Gemini
LINK-USD$20.29
0.0062097 Eth
$485,927.00
23,951.994 LINK
0.1188%
56
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$20.25
0.0061988 Eth
$477,286.00
23,728.795 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1177%
57
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$20.23
0.0061941 Eth
$474,986.00
471,471.384 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
2.3385%
58
Binance
LINK-TRY$20.30
0.0062120 Eth
$444,138.00
22,091.660 LINK
0.1096%
59
Binance
LINK-EUR$20.29
0.0062096 Eth
$434,139.00
21,569.080 LINK
0.1070%
60
QMall
LINK-USDC$20.33
0.0062156 Eth
$425,084.00
21,140.583 LINK
0.1049%
61
Coinbase Exchange
LINK-BTC$20.28
0.0062067 Eth
$419,114.00
20,668.360 LINK
0.1025%
62
GMO Japan
LINK-JPY$20.40
0.0062433 Eth
$394,567.00
19,346.200 LINK
0.0960%
63
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$20.36
0.0062304 Eth
$372,866.00
18,539.877 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0920%
64
Coins.ph
LINK-PHP$20.18
0.0061775 Eth
$319,839.00
16,151.422 LINK
0.0801%
65
BitMart
LINK-BTC$20.24
0.0061950 Eth
$270,166.00
13,350.640 LINK
0.0662%
66
Hotcoin
LINK-BTC$20.28
0.0061994 Eth
$257,667.00
12,707.030 LINK
0.0630%
67
BitDelta
LINK-USDT$20.28
0.0062082 Eth
$254,287.00
12,667.000 LINK
0.0628%
68
LATOKEN
LINK-BTC$20.28
0.0062074 Eth
$187,083.00
9,226.019 LINK
0.0458%
69
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$20.25
0.0061991 Eth
$164,149.00
8,171.138 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0405%
70
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$20.25
0.0061988 Eth
$161,405.00
8,048.479 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0399%
71
DeGate
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$20.30
0.0062140 Eth
$157,798.00
7,865.261 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0390%
72
Mercado Bitcoin
LINK-BRL$20.39
0.0062420 Eth
$145,075.00
7,115.152 LINK
0.0353%
73
PointPay
LINK-BTC$20.32
0.0062099 Eth
$134,106.00
6,638.521 LINK
0.0329%
74
BitStorage
LINK-ETH$20.25
0.0062004 Eth
$128,355.00
6,337.020 LINK
0.0314%
75
Bitkub
LINK-THB$20.26
0.0061954 Eth
$117,038.00
5,775.680 LINK
0.0286%
76
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$20.15
0.0061689 Eth
$111,257.00
5,544.389 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0275%
77
BitMart
LINK-ETH$20.25
0.0061985 Eth
$91,152.00
4,501.860 LINK
0.0223%
78
KuCoin
LINK-USDC$20.25
0.0061990 Eth
$88,721.00
4,380.642 LINK
0.0217%
79
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$20.18
0.0061765 Eth
$87,095.00
86,648.010 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.4298%
80
Hotcoin
LINK-ETH$20.27
0.0062039 Eth
$86,769.00
4,281.060 LINK
0.0212%
81
Kraken
LINK-GBP$20.29
0.0062109 Eth
$86,077.00
4,241.960 LINK
0.0210%
82
Bitso
LINK-USD$20.29
0.0062106 Eth
$84,826.00
4,180.532 LINK
0.0207%
83
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$20.23
0.0061932 Eth
$79,680.00
5,853.240 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.0290%
84
Binance US
LINK-USDT$20.27
0.0062031 Eth
$75,054.00
3,703.433 LINK
0.0184%
85
EXMO
LINK-BTC$20.26
0.0062009 Eth
$73,509.00
3,628.464 LINK
0.0180%
86
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$20.25
0.0061994 Eth
$51,193.00
2,549.690 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0126%
87
BTCMarkets
LINK-AUD$20.40
0.0062356 Eth
$48,657.00
2,385.719 LINK
0.0118%
88
Uniswap V3 (Avalanche)
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$20.31
0.0062188 Eth
$42,025.00
2,123.368 0X5947BB275C521040051D82396192181B413227A3
0.0105%
89
Bitexen
LINK-TRY$20.15
0.0061604 Eth
$35,682.00
1,770.477 LINK
0.0088%
90
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$20.28
0.0062086 Eth
$35,658.00
1,765.700 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0088%
91
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$20.23
0.0061935 Eth
$31,407.00
1,566.657 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0078%
92
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$20.21
0.0061878 Eth
$24,869.00
1,231.856 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0061%
93
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$20.18
0.0061771 Eth
$21,589.00
1,077.084 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0053%
94
HashKey Global
LINK-USDT$20.28
0.0062086 Eth
$21,130.00
1,046.854 LINK
0.0052%
95
Dex-Trade
LINK-ETH$20.25
0.0061991 Eth
$17,284.14
853.440 LINK
0.0042%
96
LFJ
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$20.17
0.0061740 Eth
$16,509.37
833.517 0X5947BB275C521040051D82396192181B413227A3
0.0041%
97
Pangolin
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$20.16
0.0061719 Eth
$11,054.99
558.328 0X5947BB275C521040051D82396192181B413227A3
0.0028%
98
THENA FUSION
0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$20.36
0.0062314 Eth
$9,625.23
12.607 0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827
0.0001%
99
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X55D398326F99059FF775485246999027B3197955$20.29
0.0062112 Eth
$8,824.58
441.566 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0022%
100
Ace
LINK-USDT$20.25
0.0061984 Eth
$4,112.61
204.890 LINK
0.0010%

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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