ETH Price: $2,673.04 (-4.75%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

739,011 ( 0.010%)

Market

Price

$16.32 @ 0.006105 ETH (-7.16%)

Onchain Market Cap

$16,320,000,000.00

Circulating Supply Market Cap

$10,410,745,747.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
0 LINK

Value
$0.00
0x9267151210c911607072f7aa1cc1aaca090b3fa2
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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 14736.36% |ETH 0.0003846 1487.36%

Market

Volume (24H):$533,992,829.00
Market Capitalization:$10,410,745,747.00
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$16.27
0.0060960 Eth
$54,076,197.00
3,226,645.960 LINK
17.6052%
2
WhiteBIT
LINK-USDT$16.29
0.0060905 Eth
$52,708,806.00
3,235,365.360 LINK
17.6528%
3
Coinbase Exchange
LINK-USD$16.30
0.0061110 Eth
$18,798,931.00
1,153,379.400 LINK
6.2931%
4
HTX
LINK-USDT$16.32
0.0060986 Eth
$13,782,993.00
811,705.093 LINK
4.4288%
5
Bybit
LINK-USDT$16.32
0.0060989 Eth
$11,378,661.00
676,749.069 LINK
3.6925%
6
P2B
LINK-USDT$16.32
0.0060995 Eth
$10,946,343.00
670,776.430 LINK
3.6599%
7
Gate.io
LINK-USDT$16.31
0.0060967 Eth
$9,858,178.00
592,277.760 LINK
3.2316%
8
KuCoin
LINK-USDT$16.32
0.0060988 Eth
$8,895,746.00
545,130.261 LINK
2.9743%
9
Bitget
LINK-USDT$16.33
0.0061030 Eth
$7,841,926.00
466,615.908 LINK
2.5460%
10
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$16.35
0.0061135 Eth
$7,546,015.00
457,223.731 0X514910771AF9CA656AF840DFF83E8264ECF986CA
2.4947%
11
DigiFinex
LINK-USDT$16.29
0.0060892 Eth
$6,641,100.00
407,728.220 LINK
2.2246%
12
OKX
LINK-USDT$16.31
0.0060969 Eth
$6,130,803.00
366,336.177 LINK
1.9988%
13
Binance
LINK-FDUSD$16.35
0.0061267 Eth
$5,801,167.00
344,117.440 LINK
1.8776%
14
XT.COM
LINK-USDT$16.35
0.0061096 Eth
$5,540,752.00
330,380.840 LINK
1.8026%
15
MEXC
LINK-EUR$16.34
0.0061090 Eth
$5,321,862.00
325,606.590 LINK
1.7766%
16
MEXC
LINK-USDC$16.25
0.0061050 Eth
$5,073,706.00
312,301.470 LINK
1.7040%
17
Hotcoin
LINK-USDT$16.26
0.0061005 Eth
$4,967,012.00
305,502.820 LINK
1.6669%
18
Coinstore
LINK-USDT$16.18
0.0060846 Eth
$4,621,555.00
275,586.060 LINK
1.5037%
19
Binance
LINK-USDC$16.30
0.0061099 Eth
$4,401,774.00
261,975.790 LINK
1.4294%
20
CoinW
LINK-USDT$16.30
0.0061071 Eth
$4,126,751.00
253,183.300 LINK
1.3814%
21
Kraken
LINK-USD$16.31
0.0060954 Eth
$3,328,583.00
204,107.366 LINK
1.1137%
22
Bitunix
LINK-USDT$16.30
0.0061099 Eth
$3,238,179.00
198,541.990 LINK
1.0833%
23
BYDFi
LINK-USDT$16.31
0.0061078 Eth
$2,933,170.00
179,798.810 LINK
0.9810%
24
BTSE
LINK-USDT$16.31
0.0060964 Eth
$2,744,252.00
168,247.207 LINK
0.9180%
25
LATOKEN
LINK-USDT$16.17
0.0060892 Eth
$2,510,005.00
155,199.042 LINK
0.8468%
26
QMall
LINK-USDT$16.24
0.0061030 Eth
$2,244,225.00
133,979.355 LINK
0.7310%
27
FMCPAY
LINK-USDT$16.32
0.0061150 Eth
$2,150,413.00
127,172.105 LINK
0.6939%
28
Bitvavo
LINK-EUR$16.31
0.0061096 Eth
$2,026,982.00
124,287.228 LINK
0.6781%
29
Dex-Trade
LINK-USDT$16.36
0.0061162 Eth
$1,756,152.00
107,336.296 LINK
0.5856%
30
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$16.27
0.0060799 Eth
$1,543,640.00
93,316.050 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.5092%
31
Biconomy.com
LINK-USDT$16.22
0.0060949 Eth
$1,274,503.00
75,130.750 LINK
0.4099%
32
Coinbase Exchange
LINK-EUR$16.32
0.0061001 Eth
$1,221,261.00
74,816.080 LINK
0.4082%
33
CoinEx
LINK-USDT$16.21
0.0060931 Eth
$1,219,805.00
72,750.592 LINK
0.3969%
34
Binance
LINK-ETH$16.27
0.0060792 Eth
$1,157,029.00
69,968.530 LINK
0.3818%
35
Coinbase Exchange
LINK-GBP$16.30
0.0060908 Eth
$1,006,557.00
61,757.680 LINK
0.3370%
36
FMCPAY
LINK-ETH$16.19
0.0060838 Eth
$947,645.00
57,399.680 LINK
0.3132%
37
FMCPAY
LINK-BTC$16.20
0.0060918 Eth
$942,193.00
56,140.400 LINK
0.3063%
38
PointPay
LINK-USDT$16.31
0.0061113 Eth
$861,608.00
51,400.022 LINK
0.2804%
39
Bitbank
LINK-JPY$16.28
0.0060836 Eth
$752,194.00
46,213.406 LINK
0.2521%
40
tanX
LINK-USDC$16.36
0.0061145 Eth
$672,959.00
39,617.170 LINK
0.2162%
41
BigONE
LINK-USDT$16.34
0.0061092 Eth
$635,621.00
38,894.000 LINK
0.2122%
42
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$16.29
0.0061009 Eth
$624,674.00
37,496.206 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.2046%
43
EXMO
LINK-USDT$16.32
0.0061009 Eth
$604,311.00
37,022.939 LINK
0.2020%
44
Phemex
LINK-USDT$16.26
0.0060958 Eth
$567,248.00
34,889.590 LINK
0.1904%
45
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$16.23
0.0060817 Eth
$505,777.00
30,631.951 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1671%
46
WhiteBIT
LINK-BTC$16.30
0.0060919 Eth
$484,371.00
29,724.850 LINK
0.1622%
47
Gemini
LINK-USD$16.34
0.0061056 Eth
$474,747.00
29,060.226 LINK
0.1586%
48
LATOKEN
LINK-BTC$16.24
0.0060919 Eth
$462,068.00
28,460.249 LINK
0.1553%
49
BitStorage
LINK-USDT$16.18
0.0060766 Eth
$431,961.00
26,693.050 LINK
0.1456%
50
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$16.18
0.0060616 Eth
$373,469.00
22,994.498 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1255%
51
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$16.28
0.0061001 Eth
$359,995.00
372,590.448 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
2.0329%
52
QMall
LINK-USDC$16.22
0.0060968 Eth
$350,617.00
20,863.069 LINK
0.1138%
53
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$16.25
0.0060717 Eth
$342,470.00
20,776.345 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1134%
54
XT.COM
LINK-ETH$16.24
0.0060822 Eth
$322,606.00
19,552.220 LINK
0.1067%
55
Binance
LINK-TRY$16.22
0.0060985 Eth
$309,082.00
18,387.800 LINK
0.1003%
56
Coinone
LINK-KRW$16.58
0.0061970 Eth
$297,438.00
17,938.286 LINK
0.0979%
57
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$16.27
0.0060799 Eth
$277,814.00
16,566.223 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0904%
58
BitMart
LINK-BTC$16.28
0.0060835 Eth
$275,707.00
16,934.160 LINK
0.0924%
59
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$16.26
0.0060766 Eth
$265,083.00
31,643.683 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.1727%
60
GMO Japan
LINK-JPY$16.21
0.0060594 Eth
$259,602.00
16,015.600 LINK
0.0874%
61
BitStorage
LINK-ETH$16.23
0.0060855 Eth
$258,097.00
15,899.030 LINK
0.0867%
62
Slex
LINK-ETH$16.24
0.0060875 Eth
$234,821.00
14,195.440 LINK
0.0775%
63
Bybit
LINK-USDC$16.33
0.0061028 Eth
$201,168.00
11,887.901 LINK
0.0649%
64
BitDelta
LINK-USDT$16.25
0.0060978 Eth
$192,408.00
11,352.000 LINK
0.0619%
65
Coinbase Exchange
LINK-BTC$16.33
0.0061038 Eth
$191,144.00
11,704.820 LINK
0.0639%
66
OKX
LINK-USDC$16.33
0.0061024 Eth
$187,983.00
11,270.557 LINK
0.0615%
67
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$16.23
0.0060808 Eth
$172,047.00
10,463.127 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0571%
68
Hotcoin
LINK-BTC$16.19
0.0060882 Eth
$170,333.00
10,518.270 LINK
0.0574%
69
Bitci TR
LINK-TRY$16.41
0.0061352 Eth
$169,942.00
9,938.050 LINK
0.0542%
70
Kraken
LINK-GBP$16.33
0.0061032 Eth
$165,562.00
10,139.270 LINK
0.0553%
71
Bybit
LINK-EUR$16.33
0.0061038 Eth
$163,533.00
9,771.840 LINK
0.0533%
72
Bitkub
LINK-THB$16.29
0.0060905 Eth
$160,596.00
9,857.018 LINK
0.0538%
73
CoinTR
LINK-TRY$16.32
0.0061183 Eth
$157,824.00
9,257.780 LINK
0.0505%
74
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$16.19
0.0060643 Eth
$150,755.00
9,154.258 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0499%
75
BYDFi
LINK-USDC$16.22
0.0061014 Eth
$148,215.00
9,139.410 LINK
0.0499%
76
Uniswap V3 (Avalanche)
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$16.34
0.0061068 Eth
$141,542.00
8,872.608 0X5947BB275C521040051D82396192181B413227A3
0.0484%
77
KuCoin
LINK-USDC$16.27
0.0060826 Eth
$127,191.00
7,815.098 LINK
0.0426%
78
bitcastle
LINK-USDT$16.32
0.0061150 Eth
$115,989.00
6,912.900 LINK
0.0377%
79
WhiteBIT
LINK-TRY$16.37
0.0061197 Eth
$101,549.00
6,203.520 LINK
0.0338%
80
BitMart
LINK-ETH$16.27
0.0060799 Eth
$97,914.00
6,017.500 LINK
0.0328%
81
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$16.35
0.0061129 Eth
$94,579.00
5,517.641 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0301%
82
Coinbase Exchange
LINK-ETH$16.24
0.0060852 Eth
$81,449.00
5,015.700 LINK
0.0274%
83
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$16.43
0.0061379 Eth
$74,955.00
4,527.452 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0247%
84
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$16.34
0.0061080 Eth
$74,638.00
4,442.372 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0242%
85
Kanga
LINK-PLN$16.27
0.0060920 Eth
$63,974.00
0.000 LINK
0.0000%
86
Binance US
LINK-USDT$16.31
0.0060946 Eth
$53,195.00
3,261.737 LINK
0.0178%
87
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$16.27
0.0060799 Eth
$51,181.00
53,323.787 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.2909%
88
PancakeSwap (v2)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$16.32
0.0061020 Eth
$50,935.00
3,087.382 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0168%
89
Hotcoin
LINK-ETH$16.31
0.0060973 Eth
$48,221.00
2,956.010 LINK
0.0161%
90
Uniswap V4 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$16.27
0.0060781 Eth
$47,590.00
2,890.716 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0158%
91
Uniswap V4 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$16.21
0.0060587 Eth
$41,658.00
43,462.595 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.2371%
92
LFJ
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$16.20
0.0060563 Eth
$41,656.00
2,599.140 0X5947BB275C521040051D82396192181B413227A3
0.0142%
93
EXMO
LINK-BTC$16.36
0.0061162 Eth
$38,946.00
2,380.035 LINK
0.0130%
94
Dex-Trade
LINK-ETH$16.28
0.0060875 Eth
$33,885.00
2,080.990 LINK
0.0114%
95
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XDAC17F958D2EE523A2206206994597C13D831EC7$16.28
0.0060865 Eth
$32,262.00
1,919.730 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0105%
96
Korbit
LINK-KRW$16.36
0.0061159 Eth
$29,722.00
1,723.277 LINK
0.0094%
97
Bitexen
LINK-TRY$16.16
0.0060669 Eth
$28,723.00
1,777.070 LINK
0.0097%
98
OKX
LINK-EUR$16.33
0.0061035 Eth
$21,085.00
1,266.766 LINK
0.0069%
99
Pangolin
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$16.23
0.0060681 Eth
$20,967.00
1,301.361 0X5947BB275C521040051D82396192181B413227A3
0.0071%
100
Uniswap V4 (Arbitrum)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$16.34
0.0061063 Eth
$16,156.62
946.640 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
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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