ETH Price: $3,279.85 (-5.62%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

727,092 ( 0.027%)

Market

Price

$23.77 @ 0.007247 ETH (-5.08%)

Onchain Market Cap

$23,770,000,000.00

Circulating Supply Market Cap

$14,998,640,810.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
0.97246704 LINK

Value
$23.12 ( ~0.00704909794115894 Eth) [0.0000%]
0x417b0c6CA4d0Ae9D1c741f891f9f28136556188E
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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 21509.09% |ETH 0.0003846 1784.3%

Market

Volume (24H):$1,166,980,536.00
Market Capitalization:$14,998,640,810.00
Circulating Supply:631,099,972.00 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$23.75
0.0072348 Eth
$82,162,231.00
3,458,879.830 LINK
14.9488%
2
Bybit
LINK-USDT$23.74
0.0072297 Eth
$45,416,943.00
1,877,556.935 LINK
8.1145%
3
Slex
LINK-USDT$23.75
0.0072297 Eth
$24,573,620.00
1,015,795.980 LINK
4.3901%
4
OKX
LINK-USDT$23.74
0.0072295 Eth
$21,443,369.00
884,140.264 LINK
3.8211%
5
DigiFinex
LINK-USDT$23.74
0.0072313 Eth
$20,977,249.00
883,497.940 LINK
3.8184%
6
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$23.76
0.0072348 Eth
$18,623,799.00
777,904.450 0X514910771AF9CA656AF840DFF83E8264ECF986CA
3.3620%
7
Gate.io
LINK-USDT$23.78
0.0072387 Eth
$17,831,898.00
736,837.440 LINK
3.1845%
8
HTX
LINK-USDT$23.72
0.0072201 Eth
$17,409,284.00
719,801.509 LINK
3.1109%
9
XT.COM
LINK-USDT$23.73
0.0072240 Eth
$17,134,284.00
707,446.480 LINK
3.0575%
10
Azbit
LINK-USDT$23.72
0.0072226 Eth
$16,961,866.00
700,199.879 LINK
3.0262%
11
Binance
LINK-FDUSD$23.78
0.0072389 Eth
$15,841,562.00
654,832.670 LINK
2.8301%
12
Coinstore
LINK-USDT$23.70
0.0072159 Eth
$14,739,340.00
608,883.250 LINK
2.6315%
13
MEXC
LINK-USDT$23.72
0.0072225 Eth
$14,583,358.00
614,881.690 LINK
2.6574%
14
Bitunix
LINK-USDT$23.71
0.0072200 Eth
$12,611,937.00
531,768.600 LINK
2.2982%
15
CoinW
LINK-USDT$23.83
0.0072592 Eth
$11,280,599.00
473,471.460 LINK
2.0463%
16
Kraken
LINK-USD$23.75
0.0072332 Eth
$9,915,426.00
417,494.269 LINK
1.8044%
17
BYDFi
LINK-USDT$23.72
0.0072226 Eth
$9,402,404.00
396,410.610 LINK
1.7132%
18
LATOKEN
LINK-USDT$23.72
0.0072226 Eth
$8,518,121.00
359,120.167 LINK
1.5521%
19
BTSE
LINK-USDT$23.77
0.0072379 Eth
$8,511,887.00
358,102.247 LINK
1.5477%
20
KuCoin
LINK-USDT$23.72
0.0072237 Eth
$8,483,169.00
357,661.043 LINK
1.5458%
21
LBank
LINK-USDT$23.73
0.0072254 Eth
$8,300,313.00
349,827.670 LINK
1.5119%
22
Binance
LINK-USDC$23.74
0.0072261 Eth
$7,887,221.00
326,995.890 LINK
1.4132%
23
QMall
LINK-USDT$23.73
0.0072262 Eth
$6,919,216.00
285,826.517 LINK
1.2353%
24
Hotcoin
LINK-USDT$23.76
0.0072348 Eth
$6,268,749.00
263,848.490 LINK
1.1403%
25
Coinbase Exchange
LINK-EUR$23.72
0.0072242 Eth
$5,794,136.00
244,231.230 LINK
1.0555%
26
Coinbase Exchange
LINK-USDT$23.75
0.0072314 Eth
$5,683,540.00
239,282.062 LINK
1.0341%
27
Dex-Trade
LINK-USDT$23.70
0.0072154 Eth
$5,356,461.00
226,039.790 LINK
0.9769%
28
FMCPAY
LINK-USDT$23.74
0.0072296 Eth
$4,376,043.00
180,500.568 LINK
0.7801%
29
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$23.72
0.0072229 Eth
$4,063,092.00
170,031.011 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.7348%
30
Bitvavo
LINK-EUR$23.74
0.0072301 Eth
$3,990,938.00
168,085.416 LINK
0.7264%
31
CoinEx
LINK-USDT$23.78
0.0072405 Eth
$3,757,835.00
155,883.705 LINK
0.6737%
32
Biconomy.com
LINK-USDT$23.76
0.0072342 Eth
$2,672,038.00
110,262.700 LINK
0.4765%
33
PointPay
LINK-USDT$23.73
0.0072257 Eth
$2,670,789.00
110,312.818 LINK
0.4768%
34
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$23.81
0.0072504 Eth
$2,040,731.00
85,120.801 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.3679%
35
Phemex
LINK-USDT$23.72
0.0072253 Eth
$1,926,478.00
81,204.580 LINK
0.3510%
36
FMCPAY
LINK-ETH$23.75
0.0072337 Eth
$1,839,085.00
76,917.920 LINK
0.3324%
37
Coinbase Exchange
LINK-GBP$23.73
0.0072275 Eth
$1,831,272.00
77,155.170 LINK
0.3335%
38
FMCPAY
LINK-BTC$23.73
0.0072268 Eth
$1,773,278.00
72,701.500 LINK
0.3142%
39
ProBit Global
LINK-USDT$23.71
0.0072207 Eth
$1,760,647.00
74,258.625 LINK
0.3209%
40
EXMO
LINK-USDT$23.78
0.0072428 Eth
$1,611,819.00
67,779.108 LINK
0.2929%
41
Kraken
LINK-EUR$23.71
0.0072215 Eth
$1,582,690.00
66,748.801 LINK
0.2885%
42
BitStorage
LINK-USDT$23.74
0.0072266 Eth
$1,326,790.00
55,896.300 LINK
0.2416%
43
Bitbank
LINK-JPY$23.81
0.0072503 Eth
$1,246,443.00
52,353.757 LINK
0.2263%
44
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$23.74
0.0072285 Eth
$1,216,564.00
50,299.473 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.2174%
45
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$23.81
0.0072490 Eth
$1,172,979.00
48,829.688 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.2110%
46
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$23.73
0.0072240 Eth
$1,160,005.00
47,843.704 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.2068%
47
Kraken
LINK-USDT$23.74
0.0072312 Eth
$1,138,493.00
47,950.642 LINK
0.2072%
48
Binance
LINK-TRY$23.94
0.0072938 Eth
$1,107,769.00
45,534.100 LINK
0.1968%
49
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$23.76
0.0072348 Eth
$1,059,431.00
75,533.148 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.3264%
50
Coinbase Exchange
LINK-ETH$23.75
0.0072336 Eth
$1,052,900.00
44,326.760 LINK
0.1916%
51
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$23.71
0.0072216 Eth
$1,009,173.00
1,027,348.581 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
4.4401%
52
EarnBIT
LINK-USDT$23.84
0.0072589 Eth
$1,005,080.00
41,288.579 LINK
0.1784%
53
Binance
LINK-EUR$23.75
0.0072370 Eth
$995,783.00
41,318.630 LINK
0.1786%
54
Gemini
LINK-USD$23.74
0.0072312 Eth
$963,476.00
40,579.062 LINK
0.1754%
55
itBit
LINK-USD$23.73
0.0072265 Eth
$907,610.00
38,247.355 LINK
0.1653%
56
Curve (Ethereum)
0XB8B295DF2CD735B15BE5EB419517AA626FC43CD5-0X514910771AF9CA656AF840DFF83E8264ECF986CA$23.72
0.0072225 Eth
$902,488.00
38,325.577 0XB8B295DF2CD735B15BE5EB419517AA626FC43CD5
0.1656%
57
Bybit
LINK-USDC$23.72
0.0072247 Eth
$879,152.00
36,364.571 LINK
0.1572%
58
BigONE
LINK-USDT$23.78
0.0072396 Eth
$869,169.00
36,557.700 LINK
0.1580%
59
Trubit
LINK-USDT$23.72
0.0072246 Eth
$853,889.00
35,362.920 LINK
0.1528%
60
LATOKEN
LINK-BTC$23.74
0.0072297 Eth
$792,538.00
33,386.002 LINK
0.1443%
61
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$23.81
0.0072504 Eth
$665,195.00
676,175.817 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
2.9223%
62
Azbit
LINK-ETH$23.73
0.0072277 Eth
$655,572.00
27,450.250 LINK
0.1186%
63
QMall
LINK-USDC$23.74
0.0072283 Eth
$644,495.00
26,726.298 LINK
0.1155%
64
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$23.73
0.0072280 Eth
$593,034.00
24,782.085 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1071%
65
GMO Japan
LINK-JPY$23.80
0.0072468 Eth
$584,514.00
24,556.500 LINK
0.1061%
66
ProBit Global
LINK-BTC$23.74
0.0072293 Eth
$575,451.00
24,239.007 LINK
0.1048%
67
Kraken
LINK-ETH$23.93
0.0072877 Eth
$552,164.00
23,075.490 LINK
0.0997%
68
Coinbase Exchange
LINK-BTC$23.74
0.0072290 Eth
$437,018.00
18,410.750 LINK
0.0796%
69
Slex
LINK-BTC$23.75
0.0072309 Eth
$430,646.00
17,618.300 LINK
0.0761%
70
OKX
LINK-USDC$23.74
0.0072314 Eth
$408,366.00
16,907.405 LINK
0.0731%
71
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$23.91
0.0072812 Eth
$379,464.00
15,863.055 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0686%
72
DeGate
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$23.74
0.0072282 Eth
$369,619.00
15,226.215 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0658%
73
BitDelta
LINK-USDT$23.72
0.0072253 Eth
$329,386.00
13,614.000 LINK
0.0588%
74
Bitso
LINK-USD$23.74
0.0072281 Eth
$327,299.00
13,788.596 LINK
0.0596%
75
bitcastle
LINK-USDT$23.74
0.0072296 Eth
$321,644.00
13,291.500 LINK
0.0574%
76
Slex
LINK-ETH$23.77
0.0072385 Eth
$312,176.00
13,045.410 LINK
0.0564%
77
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$23.75
0.0072311 Eth
$309,522.00
12,922.760 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0559%
78
PointPay
LINK-BTC$23.74
0.0072288 Eth
$301,757.00
12,368.567 LINK
0.0535%
79
HashKey Exchange
LINK-USD$23.80
0.0072500 Eth
$292,448.00
11,968.503 LINK
0.0517%
80
BitMart
LINK-BTC$23.77
0.0072356 Eth
$286,691.00
12,063.020 LINK
0.0521%
81
BitStorage
LINK-ETH$23.87
0.0072741 Eth
$261,660.00
10,960.780 LINK
0.0474%
82
Bitvavo
LINK-USDC$23.59
0.0071829 Eth
$249,505.00
10,578.954 LINK
0.0457%
83
Hotcoin
LINK-BTC$23.75
0.0072319 Eth
$227,735.00
9,589.840 LINK
0.0414%
84
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$23.73
0.0072257 Eth
$217,285.00
8,921.043 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0386%
85
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$23.72
0.0072237 Eth
$207,945.00
8,709.026 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0376%
86
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$23.81
0.0072504 Eth
$204,058.00
8,436.648 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0365%
87
Kraken
LINK-GBP$23.73
0.0072283 Eth
$202,967.00
8,551.842 LINK
0.0370%
88
KuCoin
LINK-USDC$23.71
0.0072226 Eth
$196,912.00
8,303.314 LINK
0.0359%
89
BYDFi
LINK-USDC$23.88
0.0072679 Eth
$189,345.00
7,929.410 LINK
0.0343%
90
Binance US
LINK-USDT$23.79
0.0072489 Eth
$189,085.00
7,948.973 LINK
0.0344%
91
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$23.69
0.0072164 Eth
$182,984.00
7,514.231 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0325%
92
Binance
LINK-BNB$23.84
0.0072632 Eth
$178,110.00
7,327.459 LINK
0.0317%
93
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$23.74
0.0072297 Eth
$176,485.00
179,736.724 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.7768%
94
Binance
LINK-BRL$23.75
0.0072331 Eth
$153,631.00
6,361.670 LINK
0.0275%
95
Mercado Bitcoin
LINK-BRL$23.70
0.0072194 Eth
$142,676.00
6,019.144 LINK
0.0260%
96
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$23.73
0.0072254 Eth
$137,560.00
5,736.762 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0248%
97
CoinEx
LINK-USDC$23.64
0.0071969 Eth
$117,344.00
4,951.571 LINK
0.0214%
98
BitMart
LINK-ETH$23.76
0.0072341 Eth
$109,313.00
4,600.500 LINK
0.0199%
99
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$23.73
0.0072265 Eth
$88,667.00
3,672.943 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0159%
100
Coins.ph
LINK-PHP$23.75
0.0072325 Eth
$77,929.00
3,215.028 LINK
0.0139%

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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