ETH Price: $3,245.71 (+1.58%)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

732,210 ( -0.004%)

Market

Price

$24.52 @ 0.007555 ETH (+0.51%)

Onchain Market Cap

$24,520,000,000.00

Circulating Supply Market Cap

$15,642,816,474.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
54.78337 LINK

Value
$1,343.29 ( ~0.413865895955188 Eth) [0.0000%]
0xaa53f0d38682cc977abc5b29d087ebeda9d72d95
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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 22190.91% |ETH 0.0003846 1864.38%

Market

Volume (24H):$723,037,669.00
Market Capitalization:$15,642,816,474.00
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$24.54
0.0075651 Eth
$93,358,720.00
3,787,540.590 LINK
23.0546%
2
Coinbase Exchange
LINK-USD$24.55
0.0075664 Eth
$46,661,024.00
1,900,884.990 LINK
11.5706%
3
Bybit
LINK-USDT$24.57
0.0075731 Eth
$30,382,681.00
1,233,594.704 LINK
7.5088%
4
Slex
LINK-USDT$24.53
0.0075598 Eth
$18,471,090.00
751,400.120 LINK
4.5737%
5
Gate.io
LINK-USDT$24.54
0.0075634 Eth
$14,775,493.00
597,757.020 LINK
3.6385%
6
HTX
LINK-USDT$24.56
0.0075675 Eth
$14,186,293.00
577,027.551 LINK
3.5123%
7
MEXC
LINK-USDT$24.54
0.0075680 Eth
$13,481,780.00
549,306.420 LINK
3.3436%
8
OKX
LINK-USDT$24.55
0.0075652 Eth
$11,949,281.00
484,337.713 LINK
2.9481%
9
DigiFinex
LINK-USDT$24.56
0.0075686 Eth
$11,584,443.00
471,687.090 LINK
2.8711%
10
XT.COM
LINK-USDT$24.56
0.0075709 Eth
$9,334,440.00
378,755.890 LINK
2.3055%
11
Azbit
LINK-USDT$24.58
0.0075766 Eth
$9,049,049.00
367,187.618 LINK
2.2351%
12
Coinstore
LINK-USDT$24.53
0.0075611 Eth
$8,501,369.00
345,086.360 LINK
2.1005%
13
Binance
LINK-FDUSD$24.43
0.0075425 Eth
$7,586,904.00
308,721.240 LINK
1.8792%
14
Binance
LINK-USDC$24.48
0.0075540 Eth
$7,297,875.00
295,518.450 LINK
1.7988%
15
Bitunix
LINK-USDT$24.53
0.0075609 Eth
$7,155,868.00
291,707.610 LINK
1.7756%
16
KuCoin
LINK-USDT$24.56
0.0075675 Eth
$7,093,329.00
288,862.289 LINK
1.7583%
17
CoinW
LINK-USDT$24.59
0.0075802 Eth
$6,094,117.00
247,818.730 LINK
1.5085%
18
BYDFi
LINK-USDT$24.57
0.0075730 Eth
$5,212,554.00
212,170.860 LINK
1.2915%
19
BTSE
LINK-USDT$24.53
0.0075636 Eth
$5,194,925.00
211,735.610 LINK
1.2888%
20
Hotcoin
LINK-USDT$24.55
0.0075667 Eth
$4,773,613.00
194,459.950 LINK
1.1837%
21
LATOKEN
LINK-USDT$24.55
0.0075682 Eth
$4,581,775.00
186,624.108 LINK
1.1360%
22
LBank
LINK-USDT$24.52
0.0075595 Eth
$4,564,735.00
186,157.770 LINK
1.1331%
23
QMall
LINK-USDT$24.57
0.0075735 Eth
$3,852,630.00
156,320.440 LINK
0.9515%
24
Coinbase Exchange
LINK-EUR$24.56
0.0075693 Eth
$3,714,067.00
151,245.500 LINK
0.9206%
25
Kraken
LINK-USD$24.52
0.0075578 Eth
$3,676,616.00
149,921.563 LINK
0.9126%
26
FMCPAY
LINK-USDT$24.54
0.0075669 Eth
$3,152,845.00
128,063.244 LINK
0.7795%
27
Dex-Trade
LINK-USDT$24.56
0.0075737 Eth
$3,039,585.00
123,743.801 LINK
0.7532%
28
Bitvavo
LINK-EUR$24.57
0.0075737 Eth
$2,900,862.00
118,064.951 LINK
0.7187%
29
Biconomy.com
LINK-USDT$24.57
0.0075748 Eth
$2,010,574.00
81,633.150 LINK
0.4969%
30
CoinEx
LINK-USDT$24.53
0.0075608 Eth
$2,007,450.00
81,408.446 LINK
0.4955%
31
PointPay
LINK-USDT$24.55
0.0075682 Eth
$1,439,762.00
58,448.360 LINK
0.3558%
32
FMCPAY
LINK-BTC$24.55
0.0075662 Eth
$1,412,879.00
57,881.700 LINK
0.3523%
33
Coinbase Exchange
LINK-GBP$24.51
0.0075562 Eth
$1,346,225.00
54,915.940 LINK
0.3343%
34
tanX
LINK-USDC$24.53
0.0075655 Eth
$1,234,700.00
50,251.160 LINK
0.3059%
35
Phemex
LINK-USDT$24.58
0.0075768 Eth
$1,173,879.00
47,757.270 LINK
0.2907%
36
WhiteBIT
LINK-TRY$24.44
0.0075324 Eth
$1,043,113.00
42,686.010 LINK
0.2598%
37
EXMO
LINK-USDT$24.54
0.0075657 Eth
$982,652.00
40,034.955 LINK
0.2437%
38
Gemini
LINK-USD$24.57
0.0075713 Eth
$957,427.00
38,969.541 LINK
0.2372%
39
Bitbank
LINK-JPY$24.57
0.0075768 Eth
$840,422.00
34,200.007 LINK
0.2082%
40
Trubit
LINK-USDT$24.54
0.0075669 Eth
$809,957.00
32,948.470 LINK
0.2006%
41
Binance
LINK-TRY$24.38
0.0075260 Eth
$759,646.00
30,929.300 LINK
0.1883%
42
BitStorage
LINK-USDT$24.45
0.0075496 Eth
$738,904.00
30,223.180 LINK
0.1840%
43
BigONE
LINK-USDT$24.47
0.0075515 Eth
$680,992.00
27,835.130 LINK
0.1694%
44
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$24.47
0.0075430 Eth
$660,739.00
27,161.031 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1653%
45
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$24.48
0.0075453 Eth
$591,159.00
24,049.662 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1464%
46
QMall
LINK-USDC$24.44
0.0075421 Eth
$570,713.00
23,113.779 LINK
0.1407%
47
EarnBIT
LINK-USDT$24.53
0.0075613 Eth
$567,408.00
23,019.398 LINK
0.1401%
48
Bybit
LINK-USDC$24.57
0.0075718 Eth
$513,939.00
20,859.152 LINK
0.1270%
49
WhiteBIT
LINK-BTC$24.51
0.0075538 Eth
$498,481.00
20,341.060 LINK
0.1238%
50
itBit
LINK-USD$24.53
0.0075598 Eth
$469,293.00
19,131.409 LINK
0.1165%
51
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$24.39
0.0075177 Eth
$468,293.00
39,173.423 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.2384%
52
Coinbase Exchange
LINK-USDT$24.54
0.0075625 Eth
$467,978.00
19,070.006 LINK
0.1161%
53
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$24.56
0.0075676 Eth
$444,988.00
18,024.744 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1097%
54
WhiteBIT
LINK-EUR$24.47
0.0075419 Eth
$441,581.00
18,047.450 LINK
0.1099%
55
HashKey Exchange
LINK-USD$24.50
0.0075525 Eth
$398,441.00
16,211.311 LINK
0.0987%
56
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$24.48
0.0075453 Eth
$398,316.00
400,950.558 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
2.4406%
57
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$24.49
0.0075488 Eth
$393,785.00
15,927.147 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0969%
58
OKX
LINK-USDC$24.54
0.0075622 Eth
$388,286.00
15,767.552 LINK
0.0960%
59
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$24.51
0.0075556 Eth
$365,576.00
14,833.295 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0903%
60
Coinbase Exchange
LINK-BTC$24.55
0.0075684 Eth
$335,323.00
13,658.640 LINK
0.0831%
61
LATOKEN
LINK-BTC$24.54
0.0075683 Eth
$275,535.00
11,225.951 LINK
0.0683%
62
BitMart
LINK-BTC$24.55
0.0075696 Eth
$272,170.00
11,084.720 LINK
0.0675%
63
Bitci TR
LINK-TRY$24.57
0.0075733 Eth
$246,100.00
10,028.098 LINK
0.0610%
64
DeGate
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$24.58
0.0075745 Eth
$234,308.00
9,488.420 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0578%
65
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$24.56
0.0075707 Eth
$233,245.00
9,485.146 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0577%
66
GMO Japan
LINK-JPY$24.47
0.0075442 Eth
$197,939.00
8,089.700 LINK
0.0492%
67
Hotcoin
LINK-BTC$24.55
0.0075716 Eth
$171,596.00
6,988.240 LINK
0.0425%
68
KuCoin
LINK-BTC$24.54
0.0075612 Eth
$168,002.00
6,847.250 LINK
0.0417%
69
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$24.43
0.0075283 Eth
$148,462.00
6,053.153 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0368%
70
Binance US
LINK-USDT$24.46
0.0075510 Eth
$141,733.00
5,795.313 LINK
0.0353%
71
BYDFi
LINK-USDC$24.55
0.0075686 Eth
$138,721.00
5,650.480 LINK
0.0344%
72
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$24.39
0.0075177 Eth
$138,364.00
5,671.771 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0345%
73
Bitkub
LINK-THB$24.51
0.0075542 Eth
$131,400.00
5,361.388 LINK
0.0326%
74
CoinTR
LINK-TRY$24.43
0.0075438 Eth
$119,026.00
4,853.550 LINK
0.0295%
75
PointPay
LINK-BTC$24.53
0.0075616 Eth
$109,277.00
4,469.863 LINK
0.0272%
76
Bitso
LINK-USD$24.49
0.0075504 Eth
$104,522.00
4,268.277 LINK
0.0260%
77
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$24.44
0.0075322 Eth
$93,326.00
3,795.725 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0231%
78
BitMart
LINK-ETH$24.56
0.0075695 Eth
$85,646.00
3,486.820 LINK
0.0212%
79
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$24.49
0.0075488 Eth
$77,425.00
77,666.840 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.4728%
80
Mercado Bitcoin
LINK-BRL$24.08
0.0074225 Eth
$76,410.00
3,172.827 LINK
0.0193%
81
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$24.55
0.0075661 Eth
$68,102.00
68,213.943 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.4152%
82
EXMO
LINK-BTC$24.58
0.0075769 Eth
$58,695.00
2,387.809 LINK
0.0145%
83
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$24.43
0.0075277 Eth
$58,664.00
2,410.928 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0147%
84
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$24.51
0.0075531 Eth
$56,900.00
1,691.967 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0103%
85
Nonkyc.io
LINK-BTC$24.51
0.0075729 Eth
$54,461.00
2,229.179 LINK
0.0136%
86
Hotcoin
LINK-ETH$24.54
0.0075659 Eth
$51,163.00
2,084.700 LINK
0.0127%
87
Bitexen
LINK-TRY$24.15
0.0074600 Eth
$41,894.00
1,734.819 LINK
0.0106%
88
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XDAC17F958D2EE523A2206206994597C13D831EC7$24.39
0.0075177 Eth
$35,657.00
1,461.319 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0089%
89
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$24.49
0.0075477 Eth
$35,566.00
1,462.209 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0089%
90
THENA FUSION
0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$24.41
0.0075223 Eth
$29,397.00
40.174 0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827
0.0002%
91
Dex-Trade
LINK-ETH$24.55
0.0075688 Eth
$25,340.00
1,031.960 LINK
0.0063%
92
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X1BFD67037B42CF73ACF2047067BD4F2C47D9BFD6$24.50
0.0075510 Eth
$24,786.00
1,013.955 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0062%
93
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X55D398326F99059FF775485246999027B3197955$24.54
0.0075630 Eth
$23,373.00
949.206 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0058%
94
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$24.55
0.0075662 Eth
$21,048.00
854.771 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0052%
95
CoinEx
LINK-USDC$24.48
0.0075441 Eth
$17,654.96
742.919 LINK
0.0045%
96
Gemini
LINK-BTC$24.49
0.0075484 Eth
$16,355.37
667.729 LINK
0.0041%
97
CoinEx
LINK-BTC$24.54
0.0075622 Eth
$14,503.54
598.126 LINK
0.0036%
98
Uniswap V3 (Arbitrum One)
0XBA5DDD1F9D7F570DC94A51479A000E3BCE967196-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$24.49
0.0075493 Eth
$10,896.07
34.916 0XBA5DDD1F9D7F570DC94A51479A000E3BCE967196
0.0002%
99
Ace
LINK-USDT$24.39
0.0075185 Eth
$4,165.26
169.310 LINK
0.0010%
100
KuCoin
LINK-KCS$24.66
0.0076000 Eth
$3,142.88
127.440 LINK
0.0008%

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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