ETH Price: $2,758.40 (-0.47%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

732,983 ( 0.022%)

Market

Price

$19.24 @ 0.006975 ETH (-1.14%)

Onchain Market Cap

$19,240,000,000.00

Circulating Supply Market Cap

$12,276,245,802.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
111.08835293 LINK

Value
$2,137.34 ( ~0.77484684300391 Eth) [0.0000%]
0xd37dC0e6d626a010aE0b7F6b99489cDf2AE0Dfe8
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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 17390.91% |ETH 0.0003846 1713.57%

Market

Volume (24H):$713,094,599.00
Market Capitalization:$12,276,245,802.00
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
Binance
LINK-USDT$19.21
0.0069739 Eth
$93,789,896.00
4,965,529.730 LINK
22.0833%
2
Coinbase Exchange
LINK-USD$19.25
0.0069761 Eth
$43,602,121.00
2,265,280.610 LINK
10.0744%
3
Bybit
LINK-USDT$19.21
0.0069640 Eth
$34,692,421.00
1,840,495.882 LINK
8.1853%
4
HTX
LINK-USDT$19.23
0.0069710 Eth
$20,785,090.00
1,102,347.901 LINK
4.9025%
5
P2B
LINK-USDT$19.23
0.0069713 Eth
$19,291,051.00
1,003,282.090 LINK
4.4619%
6
Slex
LINK-USDT$19.20
0.0069606 Eth
$16,207,125.00
858,856.250 LINK
3.8196%
7
Gate.io
LINK-USDT$19.22
0.0069665 Eth
$13,545,508.00
718,230.720 LINK
3.1942%
8
OKX
LINK-USDT$19.24
0.0069743 Eth
$13,265,954.00
703,807.023 LINK
3.1301%
9
DigiFinex
LINK-USDT$19.22
0.0069653 Eth
$12,026,130.00
625,768.610 LINK
2.7830%
10
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$19.16
0.0069443 Eth
$10,531,602.00
552,223.533 0X514910771AF9CA656AF840DFF83E8264ECF986CA
2.4559%
11
MEXC
LINK-USDT$19.23
0.0069665 Eth
$9,491,331.00
493,694.180 LINK
2.1956%
12
XT.COM
LINK-USDT$19.25
0.0069718 Eth
$9,284,293.00
491,828.320 LINK
2.1873%
13
KuCoin
LINK-USDT$19.24
0.0069722 Eth
$8,155,247.00
423,975.363 LINK
1.8856%
14
Coinstore
LINK-USDT$19.21
0.0069583 Eth
$7,678,463.00
406,939.980 LINK
1.8098%
15
BTSE
LINK-USDT$19.24
0.0069710 Eth
$7,309,267.00
379,815.042 LINK
1.6892%
16
Binance
LINK-USDC$19.21
0.0069702 Eth
$7,247,210.00
382,066.500 LINK
1.6992%
17
Bitunix
LINK-USDT$19.22
0.0069697 Eth
$6,824,139.00
355,104.690 LINK
1.5793%
18
CoinW
LINK-USDT$19.17
0.0069632 Eth
$6,325,922.00
330,061.480 LINK
1.4679%
19
Hotcoin
LINK-USDT$19.24
0.0069688 Eth
$5,688,011.00
295,661.940 LINK
1.3149%
20
Kraken
LINK-USD$19.24
0.0069743 Eth
$5,633,254.00
292,742.257 LINK
1.3019%
21
Azbit
LINK-USDT$19.25
0.0069728 Eth
$5,504,573.00
291,588.061 LINK
1.2968%
22
BYDFi
LINK-USDT$19.22
0.0069661 Eth
$5,312,204.00
276,384.000 LINK
1.2292%
23
Binance
LINK-FDUSD$19.26
0.0069844 Eth
$5,029,411.00
264,372.420 LINK
1.1758%
24
LATOKEN
LINK-USDT$19.22
0.0069650 Eth
$4,677,855.00
243,326.363 LINK
1.0822%
25
Bitvavo
LINK-EUR$19.22
0.0069645 Eth
$4,295,858.00
223,506.050 LINK
0.9940%
26
QMall
LINK-USDT$19.23
0.0069698 Eth
$3,826,088.00
202,746.990 LINK
0.9017%
27
Dex-Trade
LINK-USDT$19.23
0.0069713 Eth
$3,047,929.00
158,515.600 LINK
0.7050%
28
Coinbase Exchange
LINK-EUR$19.26
0.0069807 Eth
$2,480,421.00
128,795.670 LINK
0.5728%
29
FMCPAY
LINK-USDT$19.25
0.0069731 Eth
$2,349,690.00
124,502.572 LINK
0.5537%
30
Biconomy.com
LINK-USDT$19.21
0.0069707 Eth
$1,809,694.00
95,926.790 LINK
0.4266%
31
CoinEx
LINK-USDT$19.22
0.0069626 Eth
$1,530,152.00
81,346.439 LINK
0.3618%
32
PointPay
LINK-USDT$19.22
0.0069679 Eth
$1,479,123.00
78,468.596 LINK
0.3490%
33
Coinbase Exchange
LINK-GBP$19.24
0.0069715 Eth
$1,377,141.00
71,559.820 LINK
0.3183%
34
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$19.21
0.0069583 Eth
$1,358,162.00
70,986.369 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.3157%
35
FMCPAY
LINK-ETH$19.22
0.0069660 Eth
$1,285,694.00
67,208.640 LINK
0.2989%
36
FMCPAY
LINK-BTC$19.19
0.0069566 Eth
$1,141,651.00
60,048.900 LINK
0.2671%
37
Phemex
LINK-USDT$19.23
0.0069660 Eth
$1,066,618.00
55,473.660 LINK
0.2467%
38
EXMO
LINK-USDT$19.25
0.0069739 Eth
$944,604.00
49,064.374 LINK
0.2182%
39
Trubit
LINK-USDT$19.17
0.0069603 Eth
$852,965.00
45,200.110 LINK
0.2010%
40
tanX
LINK-USDC$19.20
0.0069556 Eth
$828,777.00
43,782.530 LINK
0.1947%
41
Gemini
LINK-USD$19.21
0.0069628 Eth
$782,998.00
40,757.526 LINK
0.1813%
42
BitStorage
LINK-USDT$19.20
0.0069604 Eth
$777,871.00
40,518.500 LINK
0.1802%
43
Bybit
LINK-USDC$19.24
0.0069716 Eth
$750,256.00
39,808.697 LINK
0.1770%
44
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$19.25
0.0069738 Eth
$729,720.00
38,723.809 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1722%
45
BigONE
LINK-USDT$19.31
0.0069967 Eth
$720,591.00
37,313.000 LINK
0.1659%
46
Coinbase Exchange
LINK-USDT$19.20
0.0069552 Eth
$641,470.00
33,414.352 LINK
0.1486%
47
Binance
LINK-TRY$19.27
0.0069805 Eth
$611,326.00
32,257.900 LINK
0.1435%
48
Binance
LINK-EUR$19.20
0.0069739 Eth
$594,732.00
31,478.250 LINK
0.1400%
49
QMall
LINK-USDC$19.21
0.0069655 Eth
$582,231.00
30,730.631 LINK
0.1367%
50
Coinbase Exchange
LINK-ETH$19.22
0.0069659 Eth
$579,395.00
30,149.020 LINK
0.1341%
51
PancakeSwap (v2)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$19.20
0.0069562 Eth
$578,747.00
17,745.018 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0789%
52
GMO Japan
LINK-JPY$19.27
0.0069789 Eth
$560,637.00
29,099.700 LINK
0.1294%
53
EarnBIT
LINK-USDT$19.26
0.0069775 Eth
$551,073.00
29,239.844 LINK
0.1300%
54
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$19.21
0.0069583 Eth
$530,490.00
27,720.845 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.1233%
55
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$19.24
0.0069715 Eth
$529,407.00
27,610.517 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1228%
56
Bitbank
LINK-JPY$19.30
0.0069908 Eth
$522,454.00
27,071.595 LINK
0.1204%
57
Coinbase Exchange
LINK-BTC$19.19
0.0069513 Eth
$496,655.00
25,881.250 LINK
0.1151%
58
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$19.27
0.0069796 Eth
$486,408.00
25,551.605 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.1136%
59
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$19.18
0.0069470 Eth
$465,801.00
24,364.240 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1084%
60
LATOKEN
LINK-BTC$19.22
0.0069629 Eth
$413,822.00
21,532.159 LINK
0.0958%
61
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$19.17
0.0069454 Eth
$402,506.00
20,888.445 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0929%
62
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$19.14
0.0069321 Eth
$384,080.00
378,406.599 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
1.6829%
63
OKX
LINK-USDC$19.22
0.0069635 Eth
$367,277.00
19,497.904 LINK
0.0867%
64
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$19.21
0.0069606 Eth
$356,071.00
18,626.094 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0828%
65
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$19.26
0.0069764 Eth
$351,308.00
18,631.066 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0829%
66
itBit
LINK-USD$19.24
0.0069715 Eth
$332,083.00
17,260.027 LINK
0.0768%
67
Slex
LINK-ETH$19.21
0.0069641 Eth
$310,502.00
16,233.140 LINK
0.0722%
68
BitDelta
LINK-USDT$19.25
0.0069722 Eth
$286,159.00
15,151.000 LINK
0.0674%
69
WhiteBIT
LINK-TRY$19.23
0.0069728 Eth
$260,716.00
13,557.960 LINK
0.0603%
70
Bitkub
LINK-THB$19.17
0.0069443 Eth
$253,038.00
13,199.399 LINK
0.0587%
71
DeGate
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$19.21
0.0069670 Eth
$218,086.00
11,549.251 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0514%
72
Hotcoin
LINK-BTC$19.25
0.0069722 Eth
$209,164.00
10,867.710 LINK
0.0483%
73
bitcastle
LINK-USDT$19.25
0.0069731 Eth
$189,573.00
10,046.620 LINK
0.0447%
74
BYDFi
LINK-USDC$19.17
0.0069455 Eth
$179,864.00
9,382.260 LINK
0.0417%
75
PointPay
LINK-BTC$19.24
0.0069716 Eth
$156,197.00
8,194.177 LINK
0.0364%
76
BitStorage
LINK-ETH$19.22
0.0069631 Eth
$152,282.00
7,922.470 LINK
0.0352%
77
KuCoin
LINK-USDC$19.27
0.0069850 Eth
$150,852.00
7,828.123 LINK
0.0348%
78
WhiteBIT
LINK-BTC$19.28
0.0069860 Eth
$148,829.00
7,717.510 LINK
0.0343%
79
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$19.20
0.0069560 Eth
$139,499.00
7,400.379 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0329%
80
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$19.24
0.0069726 Eth
$139,313.00
15,050.416 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.0669%
81
Mercado Bitcoin
LINK-BRL$19.29
0.0069897 Eth
$125,730.00
6,516.241 LINK
0.0290%
82
Bitso
LINK-USD$19.18
0.0069481 Eth
$124,301.00
6,480.472 LINK
0.0288%
83
Kraken
LINK-GBP$19.18
0.0069519 Eth
$118,115.00
6,157.845 LINK
0.0274%
84
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$19.23
0.0069649 Eth
$113,286.00
5,958.725 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0265%
85
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$19.16
0.0069410 Eth
$77,153.00
4,021.735 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0179%
86
Uniswap V3 (Avalanche)
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$19.15
0.0069353 Eth
$70,554.00
3,703.285 0X5947BB275C521040051D82396192181B413227A3
0.0165%
87
Binance US
LINK-USDT$19.19
0.0069510 Eth
$65,364.00
3,406.982 LINK
0.0152%
88
Hotcoin
LINK-ETH$19.23
0.0069691 Eth
$58,189.00
3,026.520 LINK
0.0135%
89
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$19.21
0.0069583 Eth
$57,300.00
56,178.817 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.2498%
90
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XDAC17F958D2EE523A2206206994597C13D831EC7$19.20
0.0069581 Eth
$49,791.00
2,640.791 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0117%
91
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$19.19
0.0069538 Eth
$43,127.00
2,259.691 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0100%
92
CoinEx
LINK-USDC$19.30
0.0069923 Eth
$38,203.00
2,049.878 LINK
0.0091%
93
Indodax
LINK-IDR$19.26
0.0069938 Eth
$29,331.00
1,523.045 LINK
0.0068%
94
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$19.28
0.0069856 Eth
$21,577.00
1,708.948 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0076%
95
Dex-Trade
LINK-ETH$19.21
0.0069616 Eth
$20,205.00
1,051.540 LINK
0.0047%
96
THENA FUSION
0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$19.24
0.0069725 Eth
$19,639.74
30.669 0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827
0.0001%
97
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X55D398326F99059FF775485246999027B3197955$19.32
0.0069983 Eth
$19,245.36
1,015.474 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0045%
98
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$19.23
0.0069652 Eth
$17,426.50
17,066.028 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.0759%
99
LFJ
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$19.21
0.0069569 Eth
$16,472.62
862.562 0X5947BB275C521040051D82396192181B413227A3
0.0038%
100
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$19.14
0.0069317 Eth
$16,433.92
856.325 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0038%

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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