ETH Price: $3,191.15 (+1.42%)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

732,153 ( -0.007%)

Market

Price

$24.44 @ 0.007659 ETH (+4.28%)

Onchain Market Cap

$24,440,000,000.00

Circulating Supply Market Cap

$15,626,492,163.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
0.28257248 LINK

Value
$6.91 ( ~0.00216536638677044 Eth) [0.0000%]
0x304f22f8ef9159a82de0919f94228a4ed1b7531b
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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 22118.18% |ETH 0.0003846 1891.42%

Market

Volume (24H):$1,015,663,514.00
Market Capitalization:$15,626,492,163.00
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$24.40
0.0076448 Eth
$131,461,394.00
5,601,872.350 LINK
21.1989%
2
Coinbase Exchange
LINK-USD$24.40
0.0076401 Eth
$69,787,134.00
2,859,659.660 LINK
10.8217%
3
Bybit
LINK-USDT$24.41
0.0076473 Eth
$52,699,229.00
2,251,387.502 LINK
8.5198%
4
OKX
LINK-USDT$24.41
0.0076471 Eth
$27,412,597.00
1,183,130.117 LINK
4.4773%
5
P2B
LINK-USDT$24.43
0.0076467 Eth
$23,384,997.00
957,151.540 LINK
3.6221%
6
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$24.49
0.0076728 Eth
$18,841,687.00
787,672.663 0X514910771AF9CA656AF840DFF83E8264ECF986CA
2.9808%
7
DigiFinex
LINK-USDT$24.42
0.0076500 Eth
$18,724,723.00
766,868.790 LINK
2.9020%
8
Gate.io
LINK-USDT$24.41
0.0076492 Eth
$17,992,654.00
767,046.920 LINK
2.9027%
9
MEXC
LINK-USDT$24.40
0.0076401 Eth
$15,339,759.00
628,638.310 LINK
2.3789%
10
HTX
LINK-USDT$24.41
0.0076479 Eth
$14,461,668.00
615,448.109 LINK
2.3290%
11
XT.COM
LINK-USDT$24.41
0.0076430 Eth
$13,055,408.00
556,240.520 LINK
2.1050%
12
Azbit
LINK-USDT$24.41
0.0076466 Eth
$12,831,804.00
546,812.681 LINK
2.0693%
13
Binance
LINK-FDUSD$24.42
0.0076519 Eth
$11,293,181.00
480,724.170 LINK
1.8192%
14
Bitunix
LINK-USDT$24.42
0.0076420 Eth
$11,157,811.00
457,065.110 LINK
1.7297%
15
Coinstore
LINK-USDT$24.43
0.0076498 Eth
$10,719,923.00
456,486.030 LINK
1.7275%
16
Kraken
LINK-USD$24.38
0.0076371 Eth
$10,369,913.00
425,416.611 LINK
1.6099%
17
Binance
LINK-USDC$24.42
0.0076465 Eth
$10,253,107.00
435,898.900 LINK
1.6496%
18
KuCoin
LINK-USDT$24.42
0.0076498 Eth
$10,222,262.00
418,679.309 LINK
1.5844%
19
CoinW
LINK-USDT$24.40
0.0076382 Eth
$9,075,119.00
371,998.720 LINK
1.4077%
20
BYDFi
LINK-USDT$24.40
0.0076448 Eth
$7,656,364.00
313,778.510 LINK
1.1874%
21
Coinbase Exchange
LINK-EUR$24.41
0.0076454 Eth
$7,439,172.00
304,788.000 LINK
1.1534%
22
BTSE
LINK-USDT$24.39
0.0076404 Eth
$6,728,022.00
275,834.459 LINK
1.0438%
23
Hotcoin
LINK-USDT$24.41
0.0076418 Eth
$6,696,775.00
274,303.310 LINK
1.0380%
24
LBank
LINK-USDT$24.44
0.0076498 Eth
$6,668,932.00
272,848.720 LINK
1.0325%
25
LATOKEN
LINK-USDT$24.42
0.0076436 Eth
$6,486,957.00
265,620.917 LINK
1.0052%
26
QMall
LINK-USDT$24.40
0.0076443 Eth
$5,490,336.00
233,835.842 LINK
0.8849%
27
Bitvavo
LINK-EUR$24.42
0.0076469 Eth
$4,955,993.00
202,920.618 LINK
0.7679%
28
Dex-Trade
LINK-USDT$24.42
0.0076450 Eth
$4,069,871.00
166,662.400 LINK
0.6307%
29
FMCPAY
LINK-USDT$24.49
0.0076659 Eth
$3,854,200.00
164,135.224 LINK
0.6211%
30
Biconomy.com
LINK-USDT$24.42
0.0076471 Eth
$3,503,732.00
150,999.720 LINK
0.5714%
31
CoinEx
LINK-USDT$24.49
0.0076663 Eth
$2,577,849.00
110,340.934 LINK
0.4176%
32
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$24.34
0.0076244 Eth
$2,408,978.00
100,915.908 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.3819%
33
PointPay
LINK-USDT$24.41
0.0076408 Eth
$2,201,917.00
93,785.808 LINK
0.3549%
34
Coinbase Exchange
LINK-GBP$24.39
0.0076395 Eth
$2,173,389.00
89,114.050 LINK
0.3372%
35
WhiteBIT
LINK-TRY$24.38
0.0076311 Eth
$2,083,678.00
85,483.630 LINK
0.3235%
36
Phemex
LINK-USDT$24.39
0.0076408 Eth
$1,848,829.00
75,798.200 LINK
0.2868%
37
FMCPAY
LINK-ETH$24.52
0.0076730 Eth
$1,735,263.00
72,362.560 LINK
0.2738%
38
FMCPAY
LINK-BTC$24.41
0.0076411 Eth
$1,504,508.00
62,905.000 LINK
0.2380%
39
Kraken
LINK-EUR$24.48
0.0076701 Eth
$1,447,882.00
59,143.150 LINK
0.2238%
40
OKX
LINK-USDC$24.40
0.0076432 Eth
$1,352,422.00
58,092.190 LINK
0.2198%
41
EarnBIT
LINK-USDT$24.48
0.0076626 Eth
$1,341,182.00
57,943.248 LINK
0.2193%
42
Tokpie
LINK-USDT$24.50
0.0076672 Eth
$1,275,718.00
52,078.174 LINK
0.1971%
43
Binance
LINK-ETH$24.40
0.0076453 Eth
$1,265,282.00
52,916.610 LINK
0.2003%
44
EXMO
LINK-USDT$24.42
0.0076510 Eth
$1,228,996.00
50,323.165 LINK
0.1904%
45
Binance
LINK-TRY$24.42
0.0076503 Eth
$1,207,644.00
51,572.700 LINK
0.1952%
46
WhiteBIT
LINK-BTC$24.44
0.0076484 Eth
$1,195,192.00
48,910.420 LINK
0.1851%
47
tanX
LINK-USDC$24.41
0.0076469 Eth
$1,183,452.00
50,454.920 LINK
0.1909%
48
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$24.33
0.0076206 Eth
$1,141,128.00
92,695.838 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.3508%
49
Bitbank
LINK-JPY$24.51
0.0076768 Eth
$1,120,883.00
45,735.797 LINK
0.1731%
50
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$24.50
0.0076754 Eth
$1,095,456.00
45,677.250 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1729%
51
BigONE
LINK-USDT$24.50
0.0076672 Eth
$1,082,731.00
44,187.040 LINK
0.1672%
52
WhiteBIT
LINK-EUR$24.38
0.0076342 Eth
$1,019,802.00
41,824.820 LINK
0.1583%
53
BitStorage
LINK-USDT$24.43
0.0076537 Eth
$981,188.00
40,161.980 LINK
0.1520%
54
Binance
LINK-EUR$24.49
0.0076647 Eth
$963,271.00
41,175.330 LINK
0.1558%
55
Trubit
LINK-USDT$24.45
0.0076517 Eth
$899,207.00
38,297.400 LINK
0.1449%
56
Coinbase Exchange
LINK-USDT$24.49
0.0076683 Eth
$873,498.00
35,665.248 LINK
0.1350%
57
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$24.34
0.0076244 Eth
$842,249.00
36,232.190 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.1371%
58
QMall
LINK-USDC$24.42
0.0076496 Eth
$812,225.00
34,509.874 LINK
0.1306%
59
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$24.42
0.0076501 Eth
$805,494.00
33,696.955 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1275%
60
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$24.42
0.0076491 Eth
$782,078.00
751,257.911 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
2.8430%
61
Gemini
LINK-USD$24.44
0.0076583 Eth
$752,211.00
30,773.509 LINK
0.1165%
62
Bybit
LINK-USDC$24.39
0.0076424 Eth
$689,017.00
29,667.561 LINK
0.1123%
63
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$24.51
0.0076775 Eth
$628,228.00
26,049.963 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0986%
64
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$24.42
0.0076502 Eth
$575,513.00
23,976.517 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0907%
65
itBit
LINK-USD$24.42
0.0076433 Eth
$560,337.00
22,945.825 LINK
0.0868%
66
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$24.40
0.0076431 Eth
$532,261.00
22,704.431 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0859%
67
Coinbase Exchange
LINK-BTC$24.41
0.0076460 Eth
$468,971.00
19,215.150 LINK
0.0727%
68
Coinbase Exchange
LINK-ETH$24.41
0.0076467 Eth
$410,076.00
16,798.380 LINK
0.0636%
69
HashKey Exchange
LINK-USD$24.43
0.0076461 Eth
$396,146.00
16,771.798 LINK
0.0635%
70
BitDelta
LINK-USDT$24.42
0.0076439 Eth
$335,049.00
14,292.000 LINK
0.0541%
71
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$24.49
0.0076728 Eth
$297,673.00
12,664.941 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0479%
72
BitMart
LINK-BTC$24.44
0.0076564 Eth
$293,611.00
12,012.860 LINK
0.0455%
73
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$24.49
0.0076718 Eth
$272,355.00
11,310.685 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0428%
74
Hotcoin
LINK-BTC$24.39
0.0076416 Eth
$265,607.00
10,888.140 LINK
0.0412%
75
bitcastle
LINK-USDT$24.45
0.0076529 Eth
$262,864.00
11,198.050 LINK
0.0424%
76
Bitso
LINK-USD$24.48
0.0076673 Eth
$234,999.00
9,601.480 LINK
0.0363%
77
DeGate
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$24.37
0.0076347 Eth
$233,956.00
9,911.558 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0375%
78
BitStorage
LINK-ETH$24.41
0.0076423 Eth
$233,100.00
9,548.940 LINK
0.0361%
79
Bitci TR
LINK-TRY$24.36
0.0076252 Eth
$224,555.00
9,551.380 LINK
0.0361%
80
Slex
LINK-ETH$24.41
0.0076463 Eth
$222,742.00
9,272.440 LINK
0.0351%
81
BYDFi
LINK-USDC$24.52
0.0076732 Eth
$213,005.00
8,687.890 LINK
0.0329%
82
PointPay
LINK-BTC$24.43
0.0076478 Eth
$211,953.00
8,877.851 LINK
0.0336%
83
KuCoin
LINK-USDC$24.39
0.0076408 Eth
$207,188.00
8,494.989 LINK
0.0321%
84
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$24.34
0.0076244 Eth
$191,837.00
183,253.741 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.6935%
85
CoinTR
LINK-TRY$24.44
0.0076521 Eth
$176,717.00
7,527.340 LINK
0.0285%
86
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$24.51
0.0076767 Eth
$176,371.00
168,425.988 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.6374%
87
Mercado Bitcoin
LINK-BRL$24.27
0.0076045 Eth
$165,109.00
6,801.938 LINK
0.0257%
88
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$24.47
0.0076652 Eth
$159,332.00
6,666.911 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0252%
89
Bitkub
LINK-THB$24.48
0.0076600 Eth
$150,914.00
6,165.979 LINK
0.0233%
90
Kraken
LINK-GBP$24.20
0.0075818 Eth
$134,364.00
5,552.382 LINK
0.0210%
91
Uniswap V3 (Avalanche)
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$24.66
0.0077256 Eth
$124,362.00
5,094.691 0X5947BB275C521040051D82396192181B413227A3
0.0193%
92
Binance US
LINK-USDT$24.49
0.0076714 Eth
$115,304.00
4,708.110 LINK
0.0178%
93
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$24.35
0.0076265 Eth
$106,285.00
4,468.084 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0169%
94
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$24.49
0.0076728 Eth
$105,678.00
8,464.750 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.0320%
95
PancakeSwap (v2)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$24.53
0.0076857 Eth
$103,343.00
4,351.271 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0165%
96
BitMart
LINK-ETH$24.43
0.0076515 Eth
$96,567.00
3,953.500 LINK
0.0150%
97
Hotcoin
LINK-ETH$24.44
0.0076518 Eth
$78,186.00
3,199.220 LINK
0.0121%
98
THENA FUSION
0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$24.46
0.0076624 Eth
$68,807.00
90.212 0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827
0.0003%
99
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XDAC17F958D2EE523A2206206994597C13D831EC7$24.49
0.0076728 Eth
$64,823.00
2,767.537 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0105%
100
Dex-Trade
LINK-ETH$24.56
0.0076829 Eth
$33,823.00
1,377.070 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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