ETH Price: $3,291.39 (+1.44%)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

732,471 ( 0.031%)

Market

Price

$24.59 @ 0.007471 ETH (-0.28%)

Onchain Market Cap

$24,590,000,000.00

Circulating Supply Market Cap

$15,695,992,666.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
217.91626872 LINK

Value
$5,358.56 ( ~1.6281 Eth) [0.0000%]
0xcb52bf3f5642bbc446b42cf2372d801e7527c0a9
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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 22254.55% |ETH 0.0003846 1842.54%

Market

Volume (24H):$1,004,123,668.00
Market Capitalization:$15,695,992,666.00
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$24.56
0.0074551 Eth
$139,028,233.00
5,508,272.740 LINK
22.4507%
2
Coinbase Exchange
LINK-USD$24.54
0.0074512 Eth
$57,142,083.00
2,328,148.740 LINK
9.4891%
3
Bybit
LINK-USDT$24.58
0.0074675 Eth
$47,934,589.00
1,901,970.313 LINK
7.7521%
4
P2B
LINK-USDT$24.67
0.0074443 Eth
$28,266,794.00
1,145,610.610 LINK
4.6693%
5
OKX
LINK-USDT$24.68
0.0074954 Eth
$22,409,078.00
884,843.919 LINK
3.6065%
6
Slex
LINK-USDT$24.54
0.0074560 Eth
$18,300,545.00
732,256.450 LINK
2.9845%
7
Gate.io
LINK-USDT$24.64
0.0074815 Eth
$18,174,358.00
719,927.960 LINK
2.9343%
8
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$24.71
0.0075082 Eth
$18,123,290.00
721,756.092 0X514910771AF9CA656AF840DFF83E8264ECF986CA
2.9417%
9
DigiFinex
LINK-USDT$24.64
0.0074872 Eth
$17,582,638.00
713,466.910 LINK
2.9080%
10
MEXC
LINK-USDT$24.61
0.0074511 Eth
$13,984,816.00
568,307.880 LINK
2.3163%
11
XT.COM
LINK-USDT$24.65
0.0074642 Eth
$13,915,274.00
551,261.030 LINK
2.2468%
12
Azbit
LINK-USDT$24.66
0.0074840 Eth
$13,746,530.00
544,574.291 LINK
2.2196%
13
HTX
LINK-USDT$24.66
0.0074884 Eth
$12,053,693.00
481,924.240 LINK
1.9642%
14
Coinstore
LINK-USDT$24.55
0.0074586 Eth
$11,898,440.00
472,232.730 LINK
1.9247%
15
Bitunix
LINK-USDT$24.56
0.0074552 Eth
$10,594,650.00
431,406.850 LINK
1.7583%
16
Binance
LINK-USDC$24.62
0.0074809 Eth
$10,174,927.00
403,070.310 LINK
1.6428%
17
CoinW
LINK-USDT$24.66
0.0074681 Eth
$8,708,288.00
353,145.180 LINK
1.4394%
18
Binance
LINK-FDUSD$24.43
0.0074153 Eth
$8,575,199.00
342,589.090 LINK
1.3963%
19
KuCoin
LINK-USDT$24.62
0.0074811 Eth
$8,322,623.00
337,991.702 LINK
1.3776%
20
BYDFi
LINK-USDT$24.62
0.0074586 Eth
$7,558,968.00
307,053.210 LINK
1.2515%
21
LATOKEN
LINK-USDT$24.56
0.0074551 Eth
$6,849,666.00
278,861.924 LINK
1.1366%
22
LBank
LINK-USDT$24.62
0.0074819 Eth
$6,667,433.00
270,781.280 LINK
1.1037%
23
Kraken
LINK-USD$24.63
0.0074786 Eth
$6,352,203.00
257,912.656 LINK
1.0512%
24
BTSE
LINK-USDT$24.54
0.0074562 Eth
$5,942,712.00
242,130.852 LINK
0.9869%
25
Hotcoin
LINK-USDT$24.66
0.0074923 Eth
$5,679,536.00
230,308.526 LINK
0.9387%
26
QMall
LINK-USDT$24.57
0.0074589 Eth
$5,669,823.00
224,488.057 LINK
0.9150%
27
Bitvavo
LINK-EUR$24.52
0.0074513 Eth
$5,567,140.00
227,046.478 LINK
0.9254%
28
WhiteBIT
LINK-USDT$24.51
0.0074473 Eth
$4,539,059.00
185,217.590 LINK
0.7549%
29
FMCPAY
LINK-USDT$24.56
0.0074649 Eth
$4,234,242.00
168,795.666 LINK
0.6880%
30
Coinbase Exchange
LINK-EUR$24.67
0.0074917 Eth
$4,216,281.00
170,892.010 LINK
0.6965%
31
Dex-Trade
LINK-USDT$24.58
0.0074432 Eth
$4,214,783.00
171,497.120 LINK
0.6990%
32
CoinEx
LINK-USDT$24.61
0.0074792 Eth
$3,123,066.00
123,344.059 LINK
0.5027%
33
Biconomy.com
LINK-USDT$24.68
0.0074743 Eth
$2,675,673.00
106,289.540 LINK
0.4332%
34
PointPay
LINK-USDT$24.65
0.0074365 Eth
$2,253,450.00
89,213.724 LINK
0.3636%
35
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$24.58
0.0074689 Eth
$2,140,095.00
85,804.158 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.3497%
36
FMCPAY
LINK-ETH$24.63
0.0074834 Eth
$1,796,845.00
71,826.560 LINK
0.2928%
37
Coinbase Exchange
LINK-GBP$24.66
0.0074936 Eth
$1,743,916.00
70,704.240 LINK
0.2882%
38
FMCPAY
LINK-BTC$24.57
0.0074576 Eth
$1,650,260.00
67,651.200 LINK
0.2757%
39
Phemex
LINK-USDT$24.54
0.0074490 Eth
$1,550,518.00
63,191.930 LINK
0.2576%
40
EXMO
LINK-USDT$24.64
0.0074811 Eth
$1,428,077.00
57,963.893 LINK
0.2363%
41
Binance
LINK-TRY$24.77
0.0074642 Eth
$1,355,484.00
53,651.650 LINK
0.2187%
42
Bybit
LINK-USDC$24.55
0.0074583 Eth
$1,171,328.00
46,176.737 LINK
0.1882%
43
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$24.54
0.0074566 Eth
$1,157,871.00
46,431.033 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.1892%
44
BitStorage
LINK-USDT$24.78
0.0074672 Eth
$1,088,600.00
43,923.830 LINK
0.1790%
45
EarnBIT
LINK-USDT$24.67
0.0074709 Eth
$1,042,507.00
41,153.264 LINK
0.1677%
46
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$24.65
0.0074901 Eth
$972,197.00
38,732.982 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1579%
47
Binance
LINK-EUR$24.65
0.0074883 Eth
$933,873.00
37,063.820 LINK
0.1511%
48
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$24.66
0.0074934 Eth
$899,860.00
75,482.778 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.3077%
49
Trubit
LINK-USDT$24.68
0.0074735 Eth
$886,553.00
35,479.900 LINK
0.1446%
50
Bitbank
LINK-JPY$24.63
0.0074850 Eth
$865,729.00
35,147.355 LINK
0.1433%
51
Coinbase Exchange
LINK-USDT$24.57
0.0074498 Eth
$849,215.00
34,563.320 LINK
0.1409%
52
BigONE
LINK-USDT$24.53
0.0074506 Eth
$833,803.00
33,997.950 LINK
0.1386%
53
QMall
LINK-USDC$24.55
0.0074539 Eth
$805,319.00
31,888.759 LINK
0.1300%
54
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$24.55
0.0074573 Eth
$775,490.00
31,024.120 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.1264%
55
OKX
LINK-USDC$24.68
0.0074926 Eth
$730,247.00
28,867.423 LINK
0.1177%
56
HashKey Exchange
LINK-USD$24.56
0.0074613 Eth
$726,356.00
28,994.994 LINK
0.1182%
57
itBit
LINK-USD$24.61
0.0074611 Eth
$715,303.00
29,065.556 LINK
0.1185%
58
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$24.69
0.0075021 Eth
$714,567.00
28,336.031 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1155%
59
WhiteBIT
LINK-TRY$24.62
0.0074811 Eth
$714,531.00
29,022.100 LINK
0.1183%
60
Gemini
LINK-USD$24.57
0.0074602 Eth
$713,517.00
29,035.724 LINK
0.1183%
61
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$24.43
0.0074255 Eth
$639,511.00
25,515.427 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.1040%
62
LATOKEN
LINK-BTC$24.59
0.0074633 Eth
$608,754.00
24,755.965 LINK
0.1009%
63
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$24.67
0.0074962 Eth
$588,567.00
23,925.132 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0975%
64
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$24.62
0.0074807 Eth
$559,679.00
573,461.737 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
2.3373%
65
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$24.56
0.0074609 Eth
$558,039.00
22,227.827 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0906%
66
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$24.62
0.0074793 Eth
$480,024.00
19,140.464 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0780%
67
Coinbase Exchange
LINK-BTC$24.55
0.0074569 Eth
$405,477.00
16,519.230 LINK
0.0673%
68
GMO Japan
LINK-JPY$24.79
0.0075030 Eth
$400,590.00
16,157.000 LINK
0.0659%
69
WhiteBIT
LINK-BTC$24.57
0.0074584 Eth
$347,979.00
14,160.490 LINK
0.0577%
70
DeGate
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$24.62
0.0074567 Eth
$331,273.00
13,163.661 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0537%
71
Kraken
LINK-GBP$24.54
0.0074523 Eth
$299,524.00
12,204.287 LINK
0.0497%
72
BitMart
LINK-BTC$24.60
0.0074750 Eth
$271,654.00
11,041.240 LINK
0.0450%
73
Slex
LINK-ETH$24.58
0.0074687 Eth
$254,251.00
10,186.950 LINK
0.0415%
74
Bitci TR
LINK-TRY$24.54
0.0074546 Eth
$253,069.00
10,121.970 LINK
0.0413%
75
PointPay
LINK-BTC$24.60
0.0074735 Eth
$240,539.00
9,744.862 LINK
0.0397%
76
WhiteBIT
LINK-EUR$24.54
0.0074582 Eth
$218,962.00
8,921.720 LINK
0.0364%
77
Bitkub
LINK-THB$24.72
0.0074870 Eth
$212,331.00
8,589.015 LINK
0.0350%
78
BitStorage
LINK-ETH$24.66
0.0074674 Eth
$201,567.00
8,175.010 LINK
0.0333%
79
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$24.57
0.0074677 Eth
$200,129.00
8,001.974 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0326%
80
Hotcoin
LINK-BTC$24.61
0.0074528 Eth
$197,899.00
8,040.290 LINK
0.0328%
81
Binance US
LINK-USDT$24.63
0.0074583 Eth
$197,143.00
8,005.373 LINK
0.0326%
82
BYDFi
LINK-USDC$24.63
0.0074664 Eth
$163,173.00
6,624.940 LINK
0.0270%
83
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$24.64
0.0074791 Eth
$162,763.00
6,507.695 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0265%
84
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$24.59
0.0074716 Eth
$147,750.00
5,875.259 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0239%
85
Coinbase Exchange
LINK-ETH$24.62
0.0074825 Eth
$147,342.00
5,984.080 LINK
0.0244%
86
Bitso
LINK-USD$24.64
0.0074832 Eth
$139,875.00
5,675.742 LINK
0.0231%
87
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$24.57
0.0074670 Eth
$135,937.00
138,473.807 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.5644%
88
KuCoin
LINK-USDC$24.54
0.0074570 Eth
$115,255.00
4,695.801 LINK
0.0191%
89
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$24.48
0.0074402 Eth
$107,895.00
4,408.046 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0180%
90
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$24.58
0.0074685 Eth
$104,298.00
106,533.038 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.4342%
91
KuCoin
LINK-BTC$24.54
0.0074556 Eth
$98,427.00
4,010.915 LINK
0.0163%
92
BitMart
LINK-ETH$24.61
0.0074777 Eth
$79,608.00
3,234.440 LINK
0.0132%
93
PancakeSwap (v2)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$24.54
0.0074568 Eth
$71,344.00
2,855.250 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0116%
94
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$24.63
0.0074800 Eth
$69,479.00
5,870.676 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.0239%
95
BTCMarkets
LINK-AUD$24.69
0.0074861 Eth
$64,824.00
2,625.551 LINK
0.0107%
96
Hotcoin
LINK-ETH$24.65
0.0074633 Eth
$63,111.00
2,560.490 LINK
0.0104%
97
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XDAC17F958D2EE523A2206206994597C13D831EC7$24.60
0.0074757 Eth
$51,334.00
2,061.576 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0084%
98
zondacrypto
LINK-PLN$24.79
0.0075075 Eth
$38,250.00
1,542.826 LINK
0.0063%
99
Dex-Trade
LINK-ETH$24.66
0.0074741 Eth
$28,373.00
1,150.730 LINK
0.0047%
100
OKX
LINK-USD$24.73
0.0075104 Eth
$11,710.09
455.054 LINK
0.0019%

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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