ETH Price: $2,145.54 (-0.22%)
Gas: 0.93 Gwei

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

740,530 ( -0.021%)

Market

Price

$14.31 @ 0.006670 ETH (+1.34%)

Onchain Market Cap

$14,310,000,000.00

Circulating Supply Market Cap

$9,141,839,236.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
190.0437361 LINK

Value
$2,719.53 ( ~1.2675 Eth) [0.0000%]
0xC8254Cf771aDc078d7877af4362f66e4DeaB6778
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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 12909.09% |ETH 0.0003846 1634.27%

Market

Volume (24H):$435,039,491.00
Market Capitalization:$9,141,839,236.00
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
Coinbase Exchange
LINK-USD$14.22
0.0066064 Eth
$20,450,825.00
1,438,072.190 LINK
9.8010%
2
HTX
LINK-USDT$14.22
0.0066214 Eth
$13,824,361.00
943,119.398 LINK
6.4277%
3
WhiteBIT
LINK-USDT$14.24
0.0066285 Eth
$13,094,402.00
919,762.220 LINK
6.2686%
4
Upbit
LINK-KRW$14.50
0.0067491 Eth
$12,645,247.00
872,334.060 LINK
5.9453%
5
Gate.io
LINK-USDT$14.24
0.0066307 Eth
$11,671,216.00
797,330.780 LINK
5.4341%
6
OKX
LINK-USDT$14.23
0.0066237 Eth
$11,429,189.00
781,551.108 LINK
5.3266%
7
Hotcoin
LINK-USDT$14.31
0.0066481 Eth
$9,123,687.00
637,368.000 LINK
4.3439%
8
P2B
LINK-USDT$14.22
0.0066229 Eth
$8,556,262.00
601,556.470 LINK
4.0999%
9
Slex
LINK-USDT$14.23
0.0066275 Eth
$8,411,429.00
574,341.060 LINK
3.9144%
10
Ourbit
LINK-USDT$14.29
0.0066402 Eth
$6,913,094.00
473,557.080 LINK
3.2275%
11
DigiFinex
LINK-USDT$14.23
0.0066240 Eth
$6,163,779.00
433,241.150 LINK
2.9527%
12
Bybit
LINK-USDT$14.23
0.0066265 Eth
$5,550,693.00
380,226.077 LINK
2.5914%
13
Binance
LINK-USDC$14.35
0.0066540 Eth
$5,000,409.00
343,025.120 LINK
2.3379%
14
Binance
LINK-FDUSD$14.21
0.0066172 Eth
$4,725,759.00
322,975.310 LINK
2.2012%
15
XT.COM
LINK-USDT$14.22
0.0066219 Eth
$4,405,725.00
301,595.490 LINK
2.0555%
16
MEXC
LINK-EUR$14.25
0.0066334 Eth
$3,991,990.00
280,151.650 LINK
1.9093%
17
Coinstore
LINK-USDT$14.24
0.0066110 Eth
$3,938,115.00
269,715.330 LINK
1.8382%
18
MEXC
LINK-USDC$14.25
0.0066195 Eth
$3,877,960.00
272,152.940 LINK
1.8548%
19
KuCoin
LINK-USDT$14.23
0.0066260 Eth
$3,802,150.00
267,166.628 LINK
1.8208%
20
CoinW
LINK-USDT$14.30
0.0066525 Eth
$3,295,895.00
230,463.810 LINK
1.5707%
21
Kraken
LINK-USD$14.23
0.0066273 Eth
$3,107,088.00
218,282.862 LINK
1.4877%
22
Azbit
LINK-USDT$14.36
0.0066713 Eth
$2,839,282.00
194,920.478 LINK
1.3285%
23
Bitunix
LINK-USDT$14.23
0.0066252 Eth
$2,647,446.00
185,984.310 LINK
1.2676%
24
BYDFi
LINK-USDT$14.24
0.0066211 Eth
$2,414,949.00
169,631.800 LINK
1.1561%
25
Bithumb
LINK-KRW$14.48
0.0067433 Eth
$2,406,349.00
166,159.168 LINK
1.1324%
26
Binance
LINK-BTC$14.29
0.0066369 Eth
$1,909,301.00
130,511.820 LINK
0.8895%
27
FMCPAY
LINK-USDT$14.21
0.0066101 Eth
$1,812,856.00
124,086.628 LINK
0.8457%
28
QMall
LINK-USDT$14.25
0.0066267 Eth
$1,797,189.00
123,073.733 LINK
0.8388%
29
Biconomy.com
LINK-USDT$14.28
0.0066307 Eth
$1,688,150.00
115,255.760 LINK
0.7855%
30
Hibt
LINK-USDT$14.37
0.0066686 Eth
$1,428,421.00
97,660.528 LINK
0.6656%
31
Bitvavo
LINK-EUR$14.24
0.0066280 Eth
$1,410,349.00
99,055.433 LINK
0.6751%
32
Dex-Trade
LINK-USDT$14.24
0.0066306 Eth
$1,321,600.00
92,786.210 LINK
0.6324%
33
CoinEx
LINK-USDT$14.24
0.0066119 Eth
$1,250,145.00
85,555.144 LINK
0.5831%
34
Coinbase Exchange
LINK-EUR$14.24
0.0066286 Eth
$1,086,965.00
76,337.130 LINK
0.5203%
35
Tokpie
LINK-USDT$14.40
0.0067053 Eth
$1,041,324.00
72,305.782 LINK
0.4928%
36
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$14.18
0.0066058 Eth
$1,002,928.00
71,069.876 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.4844%
37
FMCPAY
LINK-ETH$14.26
0.0066299 Eth
$987,258.00
69,581.760 LINK
0.4742%
38
BigONE
LINK-USDT$14.28
0.0066293 Eth
$916,782.00
64,186.060 LINK
0.4375%
39
FMCPAY
LINK-BTC$14.23
0.0066184 Eth
$890,272.00
60,870.700 LINK
0.4149%
40
Binance
LINK-ETH$14.28
0.0066338 Eth
$778,662.00
54,835.560 LINK
0.3737%
41
Trubit
LINK-USDT$14.25
0.0066264 Eth
$745,108.00
50,926.780 LINK
0.3471%
42
WhiteBIT
LINK-BTC$14.38
0.0066755 Eth
$635,436.00
44,173.720 LINK
0.3011%
43
PointPay
LINK-USDT$14.23
0.0066219 Eth
$624,086.00
42,743.848 LINK
0.2913%
44
EarnBIT
LINK-USDT$14.29
0.0066392 Eth
$555,165.00
37,965.519 LINK
0.2588%
45
Bitstamp
LINK-USD$14.24
0.0066300 Eth
$497,306.00
34,923.185 LINK
0.2380%
46
Gemini
LINK-USD$14.25
0.0066338 Eth
$490,933.00
34,456.121 LINK
0.2348%
47
Bitbank
LINK-JPY$14.21
0.0066155 Eth
$471,871.00
33,209.437 LINK
0.2263%
48
Bitstamp
LINK-EUR$14.29
0.0066537 Eth
$466,980.00
32,676.741 LINK
0.2227%
49
EXMO
LINK-USDT$14.23
0.0066272 Eth
$465,606.00
32,710.652 LINK
0.2229%
50
Coinbase Exchange
LINK-GBP$14.25
0.0066314 Eth
$440,377.00
30,914.060 LINK
0.2107%
51
tanX
LINK-USDC$14.23
0.0066125 Eth
$404,988.00
27,604.400 LINK
0.1881%
52
QMall
LINK-USDC$14.31
0.0066563 Eth
$398,225.00
27,314.572 LINK
0.1862%
53
Binance
LINK-EUR$14.34
0.0066760 Eth
$396,780.00
27,052.970 LINK
0.1844%
54
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$14.27
0.0066412 Eth
$376,671.00
26,446.421 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1802%
55
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$14.25
0.0066354 Eth
$369,328.00
25,613.026 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1746%
56
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$14.23
0.0066261 Eth
$361,808.00
24,808.036 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1691%
57
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$14.18
0.0066058 Eth
$356,042.00
24,787.319 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.1689%
58
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$14.20
0.0066092 Eth
$330,904.00
23,478.297 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.1600%
59
BitMart
LINK-BTC$14.23
0.0066236 Eth
$295,696.00
20,785.260 LINK
0.1417%
60
BYDFi
LINK-USDC$14.36
0.0066735 Eth
$283,943.00
19,772.700 LINK
0.1348%
61
Bybit
LINK-USDC$14.28
0.0066487 Eth
$279,580.00
19,183.851 LINK
0.1307%
62
Hotcoin
LINK-BTC$14.24
0.0066261 Eth
$265,697.00
18,657.060 LINK
0.1272%
63
OKX
LINK-USDC$14.22
0.0066217 Eth
$265,471.00
18,201.846 LINK
0.1241%
64
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$14.21
0.0066199 Eth
$246,855.00
17,451.740 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1189%
65
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$14.31
0.0066619 Eth
$235,449.00
16,000.619 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.1091%
66
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$14.26
0.0066362 Eth
$227,339.00
31,302.805 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.2133%
67
Slex
LINK-ETH$14.28
0.0066384 Eth
$224,004.00
15,775.260 LINK
0.1075%
68
Coinbase Exchange
LINK-USDT$14.28
0.0066330 Eth
$207,829.00
14,549.395 LINK
0.0992%
69
WhiteBIT
LINK-TRY$14.38
0.0066855 Eth
$205,139.00
14,262.820 LINK
0.0972%
70
BitDelta
LINK-USDT$14.35
0.0066701 Eth
$202,226.00
13,842.000 LINK
0.0943%
71
Coinbase Exchange
LINK-BTC$14.22
0.0066191 Eth
$195,782.00
13,769.200 LINK
0.0938%
72
CoinTR
LINK-TRY$14.35
0.0066622 Eth
$191,388.00
13,013.120 LINK
0.0887%
73
BitStorage
LINK-ETH$14.33
0.0066642 Eth
$185,120.00
12,921.620 LINK
0.0881%
74
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$14.27
0.0066412 Eth
$179,948.00
184,642.211 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
1.2584%
75
Binance
LINK-TRY$14.44
0.0066964 Eth
$178,281.00
12,174.370 LINK
0.0830%
76
Binance
LINK-JPY$14.33
0.0066593 Eth
$176,847.00
11,992.980 LINK
0.0817%
77
Coinone
LINK-KRW$14.50
0.0067523 Eth
$160,439.00
11,062.678 LINK
0.0754%
78
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$14.28
0.0066482 Eth
$150,683.00
10,605.218 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0723%
79
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$14.20
0.0066123 Eth
$140,864.00
9,664.079 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0659%
80
Bitci TR
LINK-TRY$14.36
0.0066908 Eth
$136,921.00
9,311.038 LINK
0.0635%
81
BitMart
LINK-ETH$14.22
0.0066185 Eth
$91,381.00
6,428.380 LINK
0.0438%
82
Bitkub
LINK-THB$14.22
0.0066019 Eth
$74,778.00
5,257.160 LINK
0.0358%
83
PointPay
LINK-BTC$14.21
0.0066177 Eth
$73,861.00
5,058.344 LINK
0.0345%
84
Uniswap V4 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$14.28
0.0066482 Eth
$72,234.00
5,085.252 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0347%
85
Hotcoin
LINK-ETH$14.27
0.0066314 Eth
$71,988.00
5,045.010 LINK
0.0344%
86
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$14.18
0.0066058 Eth
$62,875.00
64,045.816 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.4365%
87
Binance US
LINK-USDT$14.24
0.0066312 Eth
$58,837.00
4,130.458 LINK
0.0282%
88
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$14.18
0.0066080 Eth
$52,344.00
3,609.803 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0246%
89
Binance
LINK-BRL$14.46
0.0067104 Eth
$43,023.00
2,937.600 LINK
0.0200%
90
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$14.22
0.0066214 Eth
$42,965.00
3,037.749 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0207%
91
Uniswap V4 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$14.29
0.0066557 Eth
$37,149.00
38,034.001 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.2592%
92
Binance
LINK-BNB$14.37
0.0066706 Eth
$31,557.00
2,133.415 LINK
0.0145%
93
Bittime
LINK-USDT$14.23
0.0066242 Eth
$31,274.00
2,134.610 LINK
0.0145%
94
Bittime
LINK-IDR$14.29
0.0066499 Eth
$30,952.00
2,101.840 LINK
0.0143%
95
Dex-Trade
LINK-ETH$14.36
0.0066707 Eth
$26,055.00
1,814.970 LINK
0.0124%
96
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$14.26
0.0066388 Eth
$20,830.00
1,445.463 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0099%
97
Uniswap V3 (Avalanche)
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$14.35
0.0066790 Eth
$16,856.88
1,189.460 0X5947BB275C521040051D82396192181B413227A3
0.0081%
98
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$14.25
0.0066323 Eth
$14,723.58
15,140.505 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.1032%
99
Bitexen
LINK-TRY$14.28
0.0066466 Eth
$11,721.11
820.567 LINK
0.0056%
100
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X1BFD67037B42CF73ACF2047067BD4F2C47D9BFD6$14.27
0.0066377 Eth
$8,665.89
588.658 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0040%

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

API
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Deployed Bytecode

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Swarm Source

bzzr://c5f438ff94e5ddaf2058efa0019e246c636c37a622e04bb67827c7374acad8d6
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