ETH Price: $2,660.82 (-2.85%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

738,032 ( 0.125%)

Market

Price

$17.37 @ 0.006528 ETH (-5.24%)

Onchain Market Cap

$17,370,000,000.00

Circulating Supply Market Cap

$11,092,635,867.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
0 LINK

Value
$0.00
0x005167813ead941a7eda7221087204b27c71390c
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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 15690.91% |ETH 0.0003846 1597.35%

Market

Volume (24H):$790,285,818.00
Market Capitalization:$11,092,635,867.00
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
WhiteBIT
LINK-USDT$17.41
0.0065430 Eth
$86,878,014.00
4,990,180.360 LINK
15.6007%
2
Binance
LINK-USDT$17.37
0.0065543 Eth
$82,834,609.00
4,567,325.470 LINK
14.2787%
3
Bybit
LINK-USDT$17.27
0.0064901 Eth
$58,757,835.00
3,265,840.726 LINK
10.2099%
4
MEXC
LINK-USDT$17.39
0.0065365 Eth
$43,884,721.00
2,523,350.870 LINK
7.8887%
5
Coinbase Exchange
LINK-USD$17.39
0.0065352 Eth
$29,536,014.00
1,698,643.530 LINK
5.3104%
6
Bitget
LINK-USDT$17.41
0.0065450 Eth
$27,027,444.00
1,498,997.042 LINK
4.6863%
7
HTX
LINK-USDT$17.40
0.0065419 Eth
$18,892,718.00
1,042,713.909 LINK
3.2598%
8
P2B
LINK-USDT$17.41
0.0065435 Eth
$14,598,203.00
838,472.300 LINK
2.6213%
9
Gate.io
LINK-USDT$17.41
0.0065444 Eth
$11,819,355.00
649,365.480 LINK
2.0301%
10
OKX
LINK-USDT$17.40
0.0065409 Eth
$11,505,891.00
638,611.891 LINK
1.9965%
11
DigiFinex
LINK-USDT$17.41
0.0065425 Eth
$10,140,576.00
582,613.940 LINK
1.8214%
12
KuCoin
LINK-USDT$17.40
0.0065390 Eth
$8,580,338.00
493,261.131 LINK
1.5421%
13
XT.COM
LINK-USDT$17.39
0.0065365 Eth
$8,163,129.00
450,576.000 LINK
1.4086%
14
MEXC
LINK-EUR$17.47
0.0065652 Eth
$7,636,830.00
437,258.630 LINK
1.3670%
15
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$17.31
0.0065084 Eth
$7,553,160.00
429,140.621 0X514910771AF9CA656AF840DFF83E8264ECF986CA
1.3416%
16
Hotcoin
LINK-USDT$17.43
0.0065511 Eth
$7,372,835.00
423,032.970 LINK
1.3225%
17
MEXC
LINK-USDC$17.43
0.0065518 Eth
$7,310,414.00
419,422.370 LINK
1.3112%
18
LBank
LINK-USDT$17.41
0.0065452 Eth
$7,110,257.00
408,362.860 LINK
1.2767%
19
Coinstore
LINK-USDT$17.42
0.0065489 Eth
$7,006,468.00
386,821.980 LINK
1.2093%
20
Binance
LINK-FDUSD$17.54
0.0066118 Eth
$6,625,714.00
361,682.150 LINK
1.1307%
21
Kraken
LINK-USD$17.39
0.0065384 Eth
$6,541,521.00
376,074.606 LINK
1.1757%
22
Binance
LINK-USDC$17.41
0.0065440 Eth
$6,428,448.00
355,639.520 LINK
1.1118%
23
CoinW
LINK-USDT$17.36
0.0065635 Eth
$5,831,889.00
335,946.470 LINK
1.0503%
24
Bitunix
LINK-USDT$17.41
0.0065520 Eth
$5,310,437.00
304,865.080 LINK
0.9531%
25
Azbit
LINK-USDT$17.40
0.0065414 Eth
$4,940,219.00
272,571.240 LINK
0.8521%
26
BYDFi
LINK-USDT$17.40
0.0065470 Eth
$4,450,478.00
255,782.000 LINK
0.7996%
27
BTSE
LINK-USDT$17.40
0.0065469 Eth
$4,206,611.00
241,753.132 LINK
0.7558%
28
LATOKEN
LINK-USDT$17.43
0.0065511 Eth
$3,788,223.00
217,357.834 LINK
0.6795%
29
QMall
LINK-USDT$17.41
0.0065431 Eth
$3,446,541.00
190,224.424 LINK
0.5947%
30
Bitvavo
LINK-EUR$17.45
0.0065650 Eth
$3,213,949.00
184,196.224 LINK
0.5758%
31
FMCPAY
LINK-USDT$17.40
0.0065470 Eth
$2,522,170.00
139,044.603 LINK
0.4347%
32
Dex-Trade
LINK-USDT$17.41
0.0065617 Eth
$2,451,714.00
140,805.037 LINK
0.4402%
33
CoinEx
LINK-USDT$17.31
0.0065523 Eth
$2,370,453.00
133,793.016 LINK
0.4183%
34
Coinbase Exchange
LINK-GBP$17.41
0.0065436 Eth
$2,271,387.00
130,477.490 LINK
0.4079%
35
Biconomy.com
LINK-USDT$17.41
0.0065416 Eth
$1,696,826.00
93,983.110 LINK
0.2938%
36
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$17.39
0.0065372 Eth
$1,591,132.00
90,110.843 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.2817%
37
Coinbase Exchange
LINK-EUR$17.41
0.0065457 Eth
$1,568,845.00
90,096.600 LINK
0.2817%
38
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$17.40
0.0065409 Eth
$1,506,270.00
85,161.627 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.2662%
39
PointPay
LINK-USDT$17.42
0.0065539 Eth
$1,362,341.00
75,158.996 LINK
0.2350%
40
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$17.39
0.0065370 Eth
$1,301,797.00
73,824.803 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.2308%
41
FMCPAY
LINK-ETH$17.38
0.0065426 Eth
$1,077,051.00
61,113.440 LINK
0.1911%
42
Bybit
LINK-USDC$17.25
0.0064836 Eth
$1,040,531.00
59,269.268 LINK
0.1853%
43
FMCPAY
LINK-BTC$17.38
0.0065410 Eth
$1,026,252.00
57,552.100 LINK
0.1799%
44
BigONE
LINK-USDT$17.39
0.0065633 Eth
$952,928.00
54,786.840 LINK
0.1713%
45
Binance
LINK-ETH$17.36
0.0065490 Eth
$870,980.00
49,494.610 LINK
0.1547%
46
Phemex
LINK-USDT$17.40
0.0065402 Eth
$811,368.00
46,626.500 LINK
0.1458%
47
Trubit
LINK-USDT$17.40
0.0065405 Eth
$799,106.00
43,999.320 LINK
0.1376%
48
Gemini
LINK-USD$17.45
0.0065584 Eth
$779,972.00
44,703.875 LINK
0.1398%
49
tanX
LINK-USDC$17.40
0.0065396 Eth
$738,974.00
40,575.880 LINK
0.1269%
50
EXMO
LINK-USDT$17.38
0.0065316 Eth
$726,468.00
41,809.849 LINK
0.1307%
51
WhiteBIT
LINK-BTC$17.38
0.0065338 Eth
$716,083.00
41,198.260 LINK
0.1288%
52
LATOKEN
LINK-BTC$17.42
0.0065490 Eth
$712,211.00
40,878.027 LINK
0.1278%
53
Binance
LINK-TRY$17.49
0.0065743 Eth
$665,238.00
36,603.680 LINK
0.1144%
54
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$17.42
0.0065463 Eth
$646,746.00
35,695.413 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1116%
55
Tokpie
LINK-USDT$17.33
0.0065141 Eth
$641,881.00
37,038.889 LINK
0.1158%
56
Bitbank
LINK-JPY$17.50
0.0065772 Eth
$563,908.00
32,228.358 LINK
0.1008%
57
EarnBIT
LINK-USDT$17.43
0.0065542 Eth
$562,685.00
31,183.423 LINK
0.0975%
58
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$17.41
0.0065442 Eth
$559,218.00
587,188.373 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
1.8357%
59
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$17.42
0.0065464 Eth
$546,256.00
31,206.621 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0976%
60
QMall
LINK-USDC$17.40
0.0065388 Eth
$532,940.00
29,458.737 LINK
0.0921%
61
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$17.41
0.0065442 Eth
$454,934.00
25,720.611 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0804%
62
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$17.39
0.0065358 Eth
$454,587.00
51,851.912 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.1621%
63
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$17.41
0.0065416 Eth
$444,119.00
24,678.789 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0772%
64
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$17.45
0.0065589 Eth
$335,161.00
18,602.987 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0582%
65
GMO Japan
LINK-JPY$17.45
0.0065595 Eth
$301,216.00
17,261.500 LINK
0.0540%
66
BitMart
LINK-BTC$17.41
0.0065444 Eth
$295,338.00
16,960.300 LINK
0.0530%
67
Hotcoin
LINK-BTC$17.41
0.0065502 Eth
$258,183.00
14,825.980 LINK
0.0464%
68
Mercado Bitcoin
LINK-BRL$17.47
0.0065678 Eth
$257,717.00
14,747.827 LINK
0.0461%
69
Coinbase Exchange
LINK-BTC$17.42
0.0065483 Eth
$247,702.00
14,219.530 LINK
0.0445%
70
BYDFi
LINK-USDC$17.25
0.0064874 Eth
$230,648.00
13,371.930 LINK
0.0418%
71
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$17.42
0.0065466 Eth
$227,969.00
12,577.149 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0393%
72
BitDelta
LINK-USDT$17.40
0.0065411 Eth
$222,621.00
12,292.000 LINK
0.0384%
73
Bitkub
LINK-THB$17.50
0.0065795 Eth
$219,781.00
12,556.398 LINK
0.0393%
74
BitStorage
LINK-ETH$17.38
0.0065489 Eth
$216,290.00
12,446.030 LINK
0.0389%
75
OKX
LINK-USDC$17.42
0.0065469 Eth
$202,112.00
11,194.062 LINK
0.0350%
76
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$17.41
0.0065445 Eth
$197,720.00
11,209.143 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0350%
77
Slex
LINK-ETH$17.40
0.0065412 Eth
$179,888.00
10,200.730 LINK
0.0319%
78
Bitci TR
LINK-TRY$17.55
0.0065963 Eth
$177,561.00
9,776.840 LINK
0.0306%
79
WhiteBIT
LINK-TRY$17.47
0.0065644 Eth
$168,905.00
9,670.130 LINK
0.0302%
80
bitcastle
LINK-USDT$17.35
0.0065585 Eth
$167,433.00
9,245.700 LINK
0.0289%
81
KuCoin
LINK-USDC$17.39
0.0065373 Eth
$161,985.00
9,314.415 LINK
0.0291%
82
DeGate
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$17.43
0.0065518 Eth
$135,423.00
7,450.554 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0233%
83
Foxbit
LINK-BRL$17.46
0.0065709 Eth
$122,182.00
6,802.286 LINK
0.0213%
84
Binance US
LINK-USDT$17.40
0.0065401 Eth
$120,599.00
6,930.578 LINK
0.0217%
85
Bitso
LINK-USD$17.39
0.0065361 Eth
$116,311.00
6,688.668 LINK
0.0209%
86
Uniswap V4 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$17.29
0.0065006 Eth
$112,746.00
119,588.491 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.3739%
87
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$17.48
0.0065720 Eth
$110,866.00
6,268.804 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0196%
88
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$17.39
0.0065372 Eth
$108,963.00
113,799.842 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.3558%
89
Uniswap V4 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$17.29
0.0065006 Eth
$103,724.00
5,912.511 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0185%
90
BitMart
LINK-ETH$17.41
0.0065419 Eth
$100,805.00
5,791.080 LINK
0.0181%
91
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$17.34
0.0065170 Eth
$90,192.00
5,066.950 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0158%
92
KuCoin
LINK-BTC$17.36
0.0065262 Eth
$87,015.00
5,012.015 LINK
0.0157%
93
Gemini
LINK-BTC$17.44
0.0065546 Eth
$81,522.00
4,675.125 LINK
0.0146%
94
PointPay
LINK-BTC$17.38
0.0065403 Eth
$81,380.00
4,569.926 LINK
0.0143%
95
Hotcoin
LINK-ETH$17.41
0.0065429 Eth
$74,964.00
4,306.100 LINK
0.0135%
96
HTX
LINK-BTC$17.38
0.0065349 Eth
$65,225.00
3,715.320 LINK
0.0116%
97
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XDAC17F958D2EE523A2206206994597C13D831EC7$17.40
0.0065419 Eth
$46,587.00
2,573.692 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0080%
98
Uniswap V4 (Ethereum)
0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48-0X514910771AF9CA656AF840DFF83E8264ECF986CA$17.31
0.0065058 Eth
$44,276.00
46,426.136 0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48
0.1451%
99
Bitexen
LINK-TRY$17.32
0.0065114 Eth
$32,193.00
1,858.447 LINK
0.0058%
100
Dex-Trade
LINK-ETH$17.41
0.0065429 Eth
$28,748.00
1,651.350 LINK
0.0052%

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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