ETH Price: $3,263.68 (+5.24%)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

731,879 ( -0.045%)

Market

Price

$24.53 @ 0.007516 ETH (+7.04%)

Onchain Market Cap

$24,530,000,000.00

Circulating Supply Market Cap

$15,655,349,388.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
0 LINK

Value
$0.00
0xd51c83bc6d6f7f2816f779b22af718ebb64111ce
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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 22200% |ETH 0.0003846 1854.24%

Market

Volume (24H):$1,027,008,486.00
Market Capitalization:$15,655,349,388.00
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$24.61
0.0075666 Eth
$133,361,720.00
5,635,057.570 LINK
23.3422%
2
Coinbase Exchange
LINK-USD$24.62
0.0075716 Eth
$68,609,933.00
2,786,756.000 LINK
11.5436%
3
OKX
LINK-USDT$24.61
0.0075691 Eth
$27,462,801.00
1,180,049.954 LINK
4.8881%
4
P2B
LINK-USDT$24.60
0.0075659 Eth
$23,810,761.00
967,990.570 LINK
4.0097%
5
DigiFinex
LINK-USDT$24.65
0.0075768 Eth
$19,050,154.00
772,925.280 LINK
3.2017%
6
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$24.67
0.0075849 Eth
$18,781,608.00
767,590.262 0X514910771AF9CA656AF840DFF83E8264ECF986CA
3.1796%
7
Gate.io
LINK-USDT$24.70
0.0075920 Eth
$17,317,413.00
733,817.640 LINK
3.0397%
8
Slex
LINK-USDT$24.59
0.0075591 Eth
$16,638,897.00
696,595.280 LINK
2.8855%
9
MEXC
LINK-USDT$24.57
0.0075582 Eth
$15,756,980.00
641,396.900 LINK
2.6569%
10
HTX
LINK-USDT$24.65
0.0075829 Eth
$15,042,552.00
631,942.405 LINK
2.6177%
11
XT.COM
LINK-USDT$24.61
0.0075652 Eth
$13,281,651.00
561,013.610 LINK
2.3239%
12
Azbit
LINK-USDT$24.57
0.0075543 Eth
$12,986,113.00
548,935.600 LINK
2.2739%
13
Bitunix
LINK-USDT$24.59
0.0075667 Eth
$11,357,921.00
461,757.780 LINK
1.9127%
14
Coinstore
LINK-USDT$24.69
0.0075903 Eth
$10,933,242.00
461,197.030 LINK
1.9104%
15
KuCoin
LINK-USDT$24.72
0.0076000 Eth
$10,566,443.00
427,523.317 LINK
1.7709%
16
Binance
LINK-USDC$24.63
0.0076085 Eth
$10,556,689.00
445,116.270 LINK
1.8438%
17
CoinW
LINK-USDT$24.60
0.0075666 Eth
$9,317,778.00
378,727.950 LINK
1.5688%
18
Kraken
LINK-USD$24.61
0.0075706 Eth
$8,956,781.00
363,884.526 LINK
1.5073%
19
BYDFi
LINK-USDT$24.38
0.0075676 Eth
$7,845,711.00
321,833.730 LINK
1.3331%
20
Coinbase Exchange
LINK-EUR$24.55
0.0075523 Eth
$7,366,240.00
300,002.760 LINK
1.2427%
21
BTSE
LINK-USDT$24.59
0.0075667 Eth
$6,830,682.00
277,758.736 LINK
1.1506%
22
LATOKEN
LINK-USDT$24.58
0.0075621 Eth
$6,618,910.00
269,311.572 LINK
1.1156%
23
Hotcoin
LINK-USDT$24.60
0.0075629 Eth
$6,233,822.00
253,436.820 LINK
1.0498%
24
QMall
LINK-USDT$24.59
0.0075648 Eth
$5,464,658.00
230,663.359 LINK
0.9555%
25
Bitvavo
LINK-EUR$24.59
0.0075667 Eth
$5,396,316.00
219,420.653 LINK
0.9089%
26
Dex-Trade
LINK-USDT$24.62
0.0075709 Eth
$4,140,428.00
168,187.560 LINK
0.6967%
27
FMCPAY
LINK-USDT$24.65
0.0075774 Eth
$3,648,961.00
153,558.802 LINK
0.6361%
28
Biconomy.com
LINK-USDT$24.61
0.0075852 Eth
$3,554,122.00
152,197.240 LINK
0.6304%
29
CoinEx
LINK-USDT$24.58
0.0075580 Eth
$2,650,787.00
112,476.023 LINK
0.4659%
30
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$24.46
0.0075235 Eth
$2,385,604.00
97,872.236 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.4054%
31
Coinbase Exchange
LINK-GBP$24.62
0.0075740 Eth
$2,274,560.00
92,369.760 LINK
0.3826%
32
PointPay
LINK-USDT$24.60
0.0075636 Eth
$2,185,956.00
92,223.093 LINK
0.3820%
33
Phemex
LINK-USDT$24.58
0.0075613 Eth
$1,993,718.00
81,122.440 LINK
0.3360%
34
WhiteBIT
LINK-TRY$24.58
0.0075619 Eth
$1,856,238.00
75,528.220 LINK
0.3129%
35
FMCPAY
LINK-ETH$24.61
0.0075657 Eth
$1,781,319.00
72,524.320 LINK
0.3004%
36
FMCPAY
LINK-BTC$24.62
0.0075721 Eth
$1,460,851.00
60,733.900 LINK
0.2516%
37
Kraken
LINK-EUR$24.58
0.0075601 Eth
$1,450,520.00
59,011.960 LINK
0.2444%
38
EarnBIT
LINK-USDT$24.55
0.0075526 Eth
$1,329,318.00
57,197.344 LINK
0.2369%
39
Tokpie
LINK-USDT$24.37
0.0075152 Eth
$1,294,326.00
53,119.478 LINK
0.2200%
40
Binance
LINK-ETH$24.57
0.0075607 Eth
$1,275,637.00
52,179.790 LINK
0.2161%
41
EXMO
LINK-USDT$24.66
0.0075837 Eth
$1,263,196.00
51,219.141 LINK
0.2122%
42
OKX
LINK-USDC$24.68
0.0075895 Eth
$1,247,975.00
53,352.177 LINK
0.2210%
43
Bitbank
LINK-JPY$24.67
0.0075887 Eth
$1,232,953.00
49,986.016 LINK
0.2071%
44
Binance
LINK-TRY$24.58
0.0075635 Eth
$1,188,955.00
50,343.130 LINK
0.2085%
45
tanX
LINK-USDC$24.72
0.0076036 Eth
$1,139,222.00
47,744.930 LINK
0.1978%
46
WhiteBIT
LINK-BTC$24.56
0.0075577 Eth
$1,068,321.00
43,493.110 LINK
0.1802%
47
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$24.56
0.0075539 Eth
$1,049,636.00
43,541.777 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.1804%
48
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$24.50
0.0075344 Eth
$1,043,678.00
42,909.125 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1777%
49
BigONE
LINK-USDT$24.59
0.0075646 Eth
$1,001,738.00
40,743.120 LINK
0.1688%
50
BitStorage
LINK-USDT$24.63
0.0075725 Eth
$987,770.00
40,104.530 LINK
0.1661%
51
WhiteBIT
LINK-EUR$24.74
0.0076057 Eth
$963,032.00
38,924.890 LINK
0.1612%
52
Gemini
LINK-USD$24.79
0.0076198 Eth
$939,999.00
37,923.423 LINK
0.1571%
53
Binance
LINK-EUR$24.56
0.0075515 Eth
$917,728.00
38,991.040 LINK
0.1615%
54
Kraken
LINK-USDT$24.70
0.0075972 Eth
$900,512.00
36,456.855 LINK
0.1510%
55
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$24.63
0.0075725 Eth
$888,215.00
71,777.409 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.2973%
56
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$24.53
0.0075443 Eth
$860,558.00
36,711.181 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.1521%
57
Trubit
LINK-USDT$24.59
0.0075607 Eth
$860,520.00
36,287.060 LINK
0.1503%
58
Coinbase Exchange
LINK-USDT$24.57
0.0075534 Eth
$853,461.00
34,736.055 LINK
0.1439%
59
QMall
LINK-USDC$24.59
0.0075659 Eth
$807,121.00
34,022.798 LINK
0.1409%
60
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$24.57
0.0075583 Eth
$788,608.00
32,437.891 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1344%
61
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$24.58
0.0075612 Eth
$769,115.00
738,340.649 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
3.0584%
62
Bybit
LINK-USDC$24.67
0.0075832 Eth
$751,978.00
32,046.325 LINK
0.1327%
63
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$24.72
0.0076001 Eth
$675,961.00
27,386.654 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1134%
64
Nonkyc.io
LINK-USDT$24.50
0.0075352 Eth
$603,318.00
25,521.047 LINK
0.1057%
65
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$24.54
0.0075493 Eth
$582,528.00
23,772.366 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0985%
66
itBit
LINK-USD$24.28
0.0075445 Eth
$558,914.00
23,019.514 LINK
0.0954%
67
LATOKEN
LINK-BTC$24.58
0.0075554 Eth
$544,422.00
22,152.244 LINK
0.0918%
68
ProBit Global
LINK-BTC$24.62
0.0075721 Eth
$515,284.00
20,925.458 LINK
0.0867%
69
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$24.50
0.0075344 Eth
$502,664.00
21,351.099 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0884%
70
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$24.47
0.0075231 Eth
$485,342.00
19,943.803 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0826%
71
Coinbase Exchange
LINK-ETH$24.56
0.0075534 Eth
$472,216.00
19,227.950 LINK
0.0796%
72
Kraken
LINK-XBT$24.58
0.0075595 Eth
$453,199.00
18,439.048 LINK
0.0764%
73
Coinbase Exchange
LINK-BTC$24.57
0.0075596 Eth
$443,776.00
18,061.480 LINK
0.0748%
74
ProBit Global
LINK-USDT$24.31
0.0075548 Eth
$370,054.00
15,220.393 LINK
0.0630%
75
GMO Japan
LINK-JPY$24.37
0.0074960 Eth
$312,482.00
12,820.200 LINK
0.0531%
76
Slex
LINK-ETH$24.62
0.0075697 Eth
$302,320.00
12,281.340 LINK
0.0509%
77
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$24.67
0.0075849 Eth
$299,262.00
12,662.806 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0525%
78
BitMart
LINK-BTC$24.62
0.0075721 Eth
$291,153.00
11,826.320 LINK
0.0490%
79
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$24.46
0.0075246 Eth
$271,679.00
11,078.206 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0459%
80
bitcastle
LINK-USDT$24.59
0.0075636 Eth
$262,614.00
11,076.980 LINK
0.0459%
81
DeGate
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$24.61
0.0075736 Eth
$258,031.00
10,830.843 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0449%
82
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$24.55
0.0075500 Eth
$257,757.00
10,780.711 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0447%
83
Hotcoin
LINK-BTC$24.62
0.0075684 Eth
$249,533.00
10,136.010 LINK
0.0420%
84
Bitso
LINK-USD$24.56
0.0075524 Eth
$244,753.00
9,963.728 LINK
0.0413%
85
BitStorage
LINK-ETH$24.54
0.0075497 Eth
$227,973.00
9,291.010 LINK
0.0385%
86
KuCoin
LINK-USDC$24.70
0.0075949 Eth
$213,659.00
8,650.485 LINK
0.0358%
87
PointPay
LINK-BTC$24.32
0.0075564 Eth
$202,722.00
8,487.175 LINK
0.0352%
88
BYDFi
LINK-USDC$24.58
0.0075762 Eth
$198,558.00
8,079.500 LINK
0.0335%
89
Mercado Bitcoin
LINK-BRL$24.61
0.0075704 Eth
$195,952.00
7,961.293 LINK
0.0330%
90
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$24.46
0.0075235 Eth
$191,486.00
183,025.652 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.7581%
91
Bitkub
LINK-THB$24.57
0.0075557 Eth
$169,599.00
6,901.665 LINK
0.0286%
92
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$24.55
0.0075472 Eth
$166,999.00
159,965.826 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.6626%
93
Kraken
LINK-USDC$24.55
0.0075497 Eth
$145,871.00
5,941.317 LINK
0.0246%
94
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$24.56
0.0075545 Eth
$117,159.00
4,885.063 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0202%
95
Uniswap V3 (Avalanche)
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$24.82
0.0076317 Eth
$116,595.00
4,741.988 0X5947BB275C521040051D82396192181B413227A3
0.0196%
96
PancakeSwap (v2)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$24.59
0.0075580 Eth
$105,608.00
4,391.680 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0182%
97
Binance US
LINK-USDT$24.61
0.0075662 Eth
$97,558.00
3,964.873 LINK
0.0164%
98
BitMart
LINK-ETH$24.59
0.0075640 Eth
$97,274.00
3,955.300 LINK
0.0164%
99
KuCoin
LINK-BTC$24.66
0.0075837 Eth
$93,145.00
3,776.784 LINK
0.0156%
100
Dex-Trade
LINK-ETH$24.58
0.0075600 Eth
$36,851.00
1,499.100 LINK
0.0062%

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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