ETH Price: $2,632.85 (-3.47%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

737,793 ( 0.078%)

Market

Price

$17.29 @ 0.006567 ETH (-5.52%)

Onchain Market Cap

$17,290,000,000.00

Circulating Supply Market Cap

$11,000,418,052.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
0 LINK

Value
$0.00
0x6a67ccad7963406c49ef631cc98cfe94118337e3
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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 15618.18% |ETH 0.0003846 1607.49%

Market

Volume (24H):$740,296,514.00
Market Capitalization:$11,000,418,052.00
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$17.25
0.0065557 Eth
$78,554,299.00
4,315,031.390 LINK
14.8379%
2
WhiteBIT
LINK-USDT$17.19
0.0065245 Eth
$76,953,968.00
4,475,528.400 LINK
15.3898%
3
Bybit
LINK-USDT$17.19
0.0065168 Eth
$55,212,414.00
3,053,343.863 LINK
10.4994%
4
MEXC
LINK-USDT$17.34
0.0065750 Eth
$41,360,846.00
2,384,940.950 LINK
8.2010%
5
Coinbase Exchange
LINK-USD$17.31
0.0065636 Eth
$27,522,688.00
1,590,447.160 LINK
5.4690%
6
Bitget
LINK-USDT$17.31
0.0065620 Eth
$25,516,368.00
1,409,627.067 LINK
4.8472%
7
HTX
LINK-USDT$17.35
0.0065709 Eth
$18,767,738.00
1,029,988.016 LINK
3.5418%
8
P2B
LINK-USDT$17.34
0.0065652 Eth
$13,538,476.00
780,828.590 LINK
2.6850%
9
Gate.io
LINK-USDT$17.33
0.0065675 Eth
$11,080,900.00
606,210.440 LINK
2.0845%
10
OKX
LINK-USDT$17.32
0.0065645 Eth
$10,287,260.00
567,655.306 LINK
1.9520%
11
DigiFinex
LINK-USDT$17.31
0.0065624 Eth
$9,439,807.00
545,349.670 LINK
1.8753%
12
KuCoin
LINK-USDT$17.34
0.0065701 Eth
$8,038,172.00
463,515.267 LINK
1.5939%
13
XT.COM
LINK-USDT$17.39
0.0065901 Eth
$7,738,129.00
425,284.110 LINK
1.4624%
14
MEXC
LINK-EUR$17.32
0.0065672 Eth
$7,164,287.00
413,588.330 LINK
1.4222%
15
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$17.24
0.0065290 Eth
$7,033,971.00
401,404.328 0X514910771AF9CA656AF840DFF83E8264ECF986CA
1.3803%
16
MEXC
LINK-USDC$17.29
0.0065539 Eth
$6,852,595.00
396,396.480 LINK
1.3631%
17
Coinstore
LINK-USDT$17.24
0.0065266 Eth
$6,604,873.00
362,650.730 LINK
1.2470%
18
Binance
LINK-FDUSD$17.37
0.0065871 Eth
$6,188,944.00
338,005.970 LINK
1.1623%
19
Binance
LINK-USDC$17.36
0.0065826 Eth
$5,833,707.00
320,578.860 LINK
1.1024%
20
Kraken
LINK-USD$17.32
0.0065681 Eth
$5,657,183.00
326,543.105 LINK
1.1229%
21
CoinW
LINK-USDT$17.32
0.0065657 Eth
$5,550,710.00
320,559.840 LINK
1.1023%
22
Bitunix
LINK-USDT$17.35
0.0065728 Eth
$4,968,081.00
286,367.940 LINK
0.9847%
23
Azbit
LINK-USDT$17.34
0.0065644 Eth
$4,689,068.00
257,166.832 LINK
0.8843%
24
BYDFi
LINK-USDT$17.23
0.0065496 Eth
$4,156,720.00
241,272.640 LINK
0.8297%
25
BTSE
LINK-USDT$17.31
0.0065626 Eth
$4,123,491.00
238,249.635 LINK
0.8193%
26
LATOKEN
LINK-USDT$17.38
0.0065796 Eth
$3,589,422.00
206,555.026 LINK
0.7103%
27
QMall
LINK-USDT$17.33
0.0065713 Eth
$3,191,709.00
175,305.790 LINK
0.6028%
28
Bitvavo
LINK-EUR$17.38
0.0065888 Eth
$3,103,260.00
178,579.990 LINK
0.6141%
29
FMCPAY
LINK-USDT$17.31
0.0065659 Eth
$2,475,839.00
136,014.363 LINK
0.4677%
30
Dex-Trade
LINK-USDT$17.33
0.0065874 Eth
$2,308,719.00
133,185.587 LINK
0.4580%
31
Coinbase Exchange
LINK-GBP$17.34
0.0065781 Eth
$2,074,577.00
119,626.010 LINK
0.4114%
32
CoinEx
LINK-USDT$17.33
0.0065705 Eth
$1,756,328.00
97,985.967 LINK
0.3369%
33
Biconomy.com
LINK-USDT$17.33
0.0065692 Eth
$1,603,258.00
88,299.250 LINK
0.3036%
34
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$17.37
0.0065760 Eth
$1,533,272.00
87,369.547 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.3004%
35
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$17.34
0.0065693 Eth
$1,455,732.00
82,999.561 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.2854%
36
Coinbase Exchange
LINK-EUR$17.31
0.0065666 Eth
$1,304,624.00
75,360.450 LINK
0.2591%
37
PointPay
LINK-USDT$17.33
0.0065714 Eth
$1,263,678.00
69,370.633 LINK
0.2385%
38
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$17.37
0.0065753 Eth
$1,196,101.00
68,214.989 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.2346%
39
FMCPAY
LINK-ETH$17.36
0.0065738 Eth
$1,046,522.00
59,688.320 LINK
0.2052%
40
FMCPAY
LINK-BTC$17.32
0.0065685 Eth
$1,014,424.00
57,324.100 LINK
0.1971%
41
BigONE
LINK-USDT$17.27
0.0065517 Eth
$915,011.00
52,974.580 LINK
0.1822%
42
Binance
LINK-ETH$17.35
0.0065761 Eth
$830,496.00
47,395.540 LINK
0.1630%
43
Trubit
LINK-USDT$17.34
0.0065692 Eth
$808,950.00
44,322.190 LINK
0.1524%
44
tanX
LINK-USDC$17.37
0.0065862 Eth
$776,771.00
42,526.980 LINK
0.1462%
45
Phemex
LINK-USDT$17.38
0.0065796 Eth
$766,574.00
44,112.850 LINK
0.1517%
46
Gemini
LINK-USD$17.34
0.0065748 Eth
$694,260.00
40,033.132 LINK
0.1377%
47
EXMO
LINK-USDT$17.33
0.0065675 Eth
$682,937.00
39,396.523 LINK
0.1355%
48
LATOKEN
LINK-BTC$17.37
0.0065766 Eth
$656,596.00
37,800.998 LINK
0.1300%
49
Binance
LINK-TRY$17.38
0.0066111 Eth
$653,837.00
35,944.810 LINK
0.1236%
50
WhiteBIT
LINK-BTC$17.29
0.0065566 Eth
$636,058.00
36,797.190 LINK
0.1265%
51
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$17.32
0.0065569 Eth
$624,053.00
34,332.051 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1181%
52
BitStorage
LINK-USDT$17.34
0.0065652 Eth
$605,420.00
34,917.450 LINK
0.1201%
53
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$17.32
0.0065569 Eth
$553,934.00
586,135.681 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
2.0155%
54
EarnBIT
LINK-USDT$17.34
0.0065752 Eth
$506,064.00
27,864.208 LINK
0.0958%
55
Bitbank
LINK-JPY$17.37
0.0065871 Eth
$505,098.00
29,071.091 LINK
0.1000%
56
Bybit
LINK-USDC$17.24
0.0065376 Eth
$502,749.00
27,922.097 LINK
0.0960%
57
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$17.33
0.0065601 Eth
$493,991.00
28,582.124 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0983%
58
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$17.38
0.0065830 Eth
$480,320.00
54,716.041 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.1881%
59
QMall
LINK-USDC$17.36
0.0065762 Eth
$477,862.00
26,240.016 LINK
0.0902%
60
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$17.32
0.0065569 Eth
$414,969.00
23,778.930 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0818%
61
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$17.35
0.0065691 Eth
$400,177.00
21,921.924 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0754%
62
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$17.29
0.0065505 Eth
$334,682.00
18,739.151 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0644%
63
BitMart
LINK-BTC$17.34
0.0065635 Eth
$290,198.00
16,740.380 LINK
0.0576%
64
GMO Japan
LINK-JPY$17.40
0.0065915 Eth
$267,683.00
15,382.300 LINK
0.0529%
65
Mercado Bitcoin
LINK-BRL$17.40
0.0065899 Eth
$250,602.00
14,399.177 LINK
0.0495%
66
Hotcoin
LINK-BTC$17.37
0.0065761 Eth
$247,628.00
14,257.320 LINK
0.0490%
67
Coinbase Exchange
LINK-BTC$17.31
0.0065653 Eth
$233,784.00
13,506.990 LINK
0.0464%
68
BYDFi
LINK-USDC$17.26
0.0065487 Eth
$218,079.00
12,637.660 LINK
0.0435%
69
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$17.35
0.0065700 Eth
$215,846.00
11,847.246 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0407%
70
BitDelta
LINK-USDT$17.32
0.0065709 Eth
$213,891.00
11,747.000 LINK
0.0404%
71
BitStorage
LINK-ETH$17.37
0.0065791 Eth
$207,050.00
11,920.440 LINK
0.0410%
72
Bitkub
LINK-THB$17.38
0.0065809 Eth
$203,318.00
11,698.272 LINK
0.0402%
73
OKX
LINK-USDC$17.33
0.0065717 Eth
$195,811.00
10,821.024 LINK
0.0372%
74
Bitci TR
LINK-TRY$17.33
0.0065752 Eth
$180,374.00
9,893.400 LINK
0.0340%
75
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$17.36
0.0065732 Eth
$168,433.00
9,608.523 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0330%
76
WhiteBIT
LINK-TRY$17.45
0.0066181 Eth
$161,606.00
9,262.320 LINK
0.0318%
77
bitcastle
LINK-USDT$17.37
0.0065758 Eth
$158,644.00
8,708.250 LINK
0.0299%
78
Slex
LINK-ETH$17.33
0.0065749 Eth
$153,191.00
8,741.760 LINK
0.0301%
79
DeGate
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$17.41
0.0065910 Eth
$131,226.00
7,181.087 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0247%
80
KuCoin
LINK-USDC$17.36
0.0065754 Eth
$127,621.00
7,353.225 LINK
0.0253%
81
Foxbit
LINK-BRL$17.40
0.0065986 Eth
$120,723.00
6,714.566 LINK
0.0231%
82
CoinTR
LINK-TRY$17.44
0.0066131 Eth
$119,848.00
6,588.140 LINK
0.0227%
83
Binance US
LINK-USDT$17.35
0.0065823 Eth
$118,292.00
6,816.867 LINK
0.0234%
84
Uniswap V4 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$17.37
0.0065801 Eth
$115,622.00
122,221.071 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.4203%
85
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$17.37
0.0065760 Eth
$109,855.00
115,252.075 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.3963%
86
Bitso
LINK-USD$17.33
0.0065608 Eth
$109,046.00
6,293.395 LINK
0.0216%
87
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$17.32
0.0065584 Eth
$105,767.00
6,041.016 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0208%
88
Uniswap V4 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$17.40
0.0065891 Eth
$97,016.00
5,523.489 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0190%
89
BitMart
LINK-ETH$17.39
0.0065830 Eth
$94,356.00
5,426.940 LINK
0.0187%
90
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$17.44
0.0066051 Eth
$90,597.00
5,101.200 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0175%
91
PointPay
LINK-BTC$17.31
0.0065639 Eth
$75,330.00
4,261.502 LINK
0.0147%
92
Hotcoin
LINK-ETH$17.33
0.0065745 Eth
$71,770.00
4,140.960 LINK
0.0142%
93
KuCoin
LINK-BTC$17.30
0.0065538 Eth
$66,009.00
3,815.776 LINK
0.0131%
94
HTX
LINK-BTC$17.35
0.0065699 Eth
$52,163.00
2,983.230 LINK
0.0103%
95
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XDAC17F958D2EE523A2206206994597C13D831EC7$17.33
0.0065624 Eth
$44,867.00
2,468.900 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0085%
96
Uniswap V4 (Ethereum)
0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48-0X514910771AF9CA656AF840DFF83E8264ECF986CA$17.31
0.0065560 Eth
$41,323.00
43,521.421 0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48
0.1497%
97
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$17.29
0.0065478 Eth
$34,453.00
1,969.993 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0068%
98
Bitexen
LINK-TRY$17.15
0.0065039 Eth
$29,992.00
1,748.447 LINK
0.0060%
99
Dex-Trade
LINK-ETH$17.37
0.0065791 Eth
$27,185.00
1,565.090 LINK
0.0054%
100
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$17.34
0.0065789 Eth
$20,490.00
1,126.739 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0039%

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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