ETH Price: $2,676.15 (-2.89%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

736,317 ( 0.013%)

Market

Price

$17.97 @ 0.006715 ETH (-8.64%)

Onchain Market Cap

$17,970,000,000.00

Circulating Supply Market Cap

$11,448,218,840.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
0 LINK

Value
$0.00
0xff9b21c3bfa4bce9b20b55fed56d102ced48b0f6
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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 16236.36% |ETH 0.0003846 1645.97%

Market

Volume (24H):$666,386,695.00
Market Capitalization:$11,448,218,840.00
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$17.87
0.0066654 Eth
$76,389,509.00
4,104,559.270 LINK
17.5782%
2
MEXC
LINK-USDT$17.90
0.0066545 Eth
$43,046,245.00
2,405,482.430 LINK
10.3017%
3
Bybit
LINK-USDT$17.83
0.0066512 Eth
$29,986,770.00
1,604,024.955 LINK
6.8694%
4
Coinbase Exchange
LINK-USD$17.88
0.0066639 Eth
$29,435,942.00
1,646,213.390 LINK
7.0501%
5
HTX
LINK-USDT$17.86
0.0066643 Eth
$19,314,294.00
1,035,446.670 LINK
4.4344%
6
MEXC
LINK-EUR$17.87
0.0066682 Eth
$13,384,647.00
748,864.320 LINK
3.2071%
7
MEXC
LINK-USDC$17.96
0.0066932 Eth
$12,975,491.00
722,596.000 LINK
3.0946%
8
Bitget
LINK-USDT$17.85
0.0066580 Eth
$11,463,274.00
613,879.943 LINK
2.6290%
9
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$17.91
0.0066778 Eth
$10,918,668.00
589,863.535 0X514910771AF9CA656AF840DFF83E8264ECF986CA
2.5262%
10
WhiteBIT
LINK-USDT$17.98
0.0066884 Eth
$10,524,251.00
585,350.560 LINK
2.5068%
11
Kraken
LINK-USD$17.84
0.0066566 Eth
$9,495,024.00
532,167.544 LINK
2.2791%
12
DigiFinex
LINK-USDT$17.84
0.0066549 Eth
$8,961,339.00
502,190.080 LINK
2.1507%
13
OKX
LINK-USDT$17.86
0.0066609 Eth
$8,899,469.00
478,273.773 LINK
2.0483%
14
Gate.io
LINK-USDT$17.85
0.0066591 Eth
$8,309,109.00
446,045.420 LINK
1.9102%
15
XT.COM
LINK-USDT$17.97
0.0066874 Eth
$7,641,798.00
410,265.320 LINK
1.7570%
16
Coinstore
LINK-USDT$17.91
0.0066800 Eth
$6,582,678.00
353,495.670 LINK
1.5139%
17
KuCoin
LINK-USDT$17.85
0.0066551 Eth
$6,489,522.00
363,491.660 LINK
1.5567%
18
CoinW
LINK-USDT$17.85
0.0066587 Eth
$5,605,306.00
313,938.510 LINK
1.3445%
19
Binance
LINK-FDUSD$18.00
0.0066925 Eth
$5,476,017.00
295,002.440 LINK
1.2634%
20
Binance
LINK-USDC$17.96
0.0066971 Eth
$5,416,602.00
289,884.280 LINK
1.2415%
21
BTSE
LINK-USDT$17.94
0.0066882 Eth
$4,684,629.00
261,163.799 LINK
1.1185%
22
Azbit
LINK-USDT$17.97
0.0066897 Eth
$4,558,653.00
244,810.726 LINK
1.0484%
23
Bitunix
LINK-USDT$17.85
0.0066571 Eth
$4,532,952.00
253,868.820 LINK
1.0872%
24
BYDFi
LINK-USDT$17.91
0.0066696 Eth
$4,101,498.00
228,963.440 LINK
0.9806%
25
Hotcoin
LINK-USDT$17.91
0.0066651 Eth
$3,928,466.00
219,284.730 LINK
0.9391%
26
LATOKEN
LINK-USDT$17.97
0.0066848 Eth
$3,602,053.00
200,474.885 LINK
0.8586%
27
Coinbase Exchange
LINK-GBP$17.90
0.0066697 Eth
$3,435,824.00
191,980.480 LINK
0.8222%
28
QMall
LINK-USDT$17.86
0.0066622 Eth
$2,998,020.00
161,653.011 LINK
0.6923%
29
FMCPAY
LINK-USDT$17.98
0.0066887 Eth
$2,879,409.00
154,498.315 LINK
0.6617%
30
Coinbase Exchange
LINK-EUR$17.88
0.0066649 Eth
$2,773,428.00
155,081.150 LINK
0.6642%
31
Bitvavo
LINK-EUR$17.89
0.0066741 Eth
$2,279,359.00
127,409.124 LINK
0.5456%
32
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$17.96
0.0066938 Eth
$2,182,704.00
118,666.092 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.5082%
33
CoinEx
LINK-USDT$17.90
0.0066766 Eth
$1,726,399.00
93,566.398 LINK
0.4007%
34
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$17.93
0.0066897 Eth
$1,630,557.00
87,422.946 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.3744%
35
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$17.87
0.0066590 Eth
$1,526,096.00
81,640.452 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.3496%
36
Biconomy.com
LINK-USDT$17.91
0.0066674 Eth
$1,484,596.00
79,656.890 LINK
0.3411%
37
FMCPAY
LINK-ETH$17.94
0.0066764 Eth
$1,229,145.00
66,487.200 LINK
0.2847%
38
FMCPAY
LINK-BTC$17.97
0.0066826 Eth
$1,225,420.00
65,754.900 LINK
0.2816%
39
PointPay
LINK-USDT$17.97
0.0066986 Eth
$1,156,348.00
62,175.366 LINK
0.2663%
40
Gemini
LINK-USD$17.88
0.0066674 Eth
$991,015.00
55,432.101 LINK
0.2374%
41
Binance
LINK-ETH$17.91
0.0066810 Eth
$860,357.00
47,051.170 LINK
0.2015%
42
tanX
LINK-USDC$17.90
0.0066707 Eth
$798,809.00
42,931.630 LINK
0.1839%
43
EXMO
LINK-USDT$17.89
0.0066696 Eth
$788,463.00
44,067.488 LINK
0.1887%
44
Trubit
LINK-USDT$17.98
0.0066906 Eth
$767,284.00
41,126.550 LINK
0.1761%
45
WhiteBIT
LINK-BTC$17.92
0.0066963 Eth
$760,544.00
42,449.530 LINK
0.1818%
46
Phemex
LINK-USDT$17.97
0.0066876 Eth
$744,494.00
41,425.560 LINK
0.1774%
47
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$17.87
0.0066596 Eth
$640,960.00
34,317.468 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1470%
48
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$17.87
0.0066596 Eth
$605,726.00
634,701.239 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
2.7182%
49
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$17.96
0.0066938 Eth
$602,032.00
631,060.707 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
2.7026%
50
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$17.95
0.0066911 Eth
$597,172.00
33,136.008 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1419%
51
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$17.92
0.0066767 Eth
$591,042.00
31,897.875 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1366%
52
BitStorage
LINK-USDT$17.92
0.0066766 Eth
$586,319.00
32,727.690 LINK
0.1402%
53
LATOKEN
LINK-BTC$17.94
0.0066794 Eth
$551,321.00
30,725.747 LINK
0.1316%
54
BigONE
LINK-USDT$18.00
0.0067110 Eth
$545,984.00
30,339.100 LINK
0.1299%
55
Bitbank
LINK-JPY$18.00
0.0067074 Eth
$542,965.00
30,168.333 LINK
0.1292%
56
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$17.89
0.0066685 Eth
$540,221.00
58,121.264 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.2489%
57
Binance
LINK-EUR$17.98
0.0066844 Eth
$501,307.00
27,240.500 LINK
0.1167%
58
Bybit
LINK-USDC$17.88
0.0066693 Eth
$450,801.00
24,012.993 LINK
0.1028%
59
QMall
LINK-USDC$17.91
0.0066821 Eth
$412,177.00
22,133.425 LINK
0.0948%
60
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$17.97
0.0066952 Eth
$401,381.00
21,651.876 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0927%
61
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$17.93
0.0066909 Eth
$375,387.00
20,313.380 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0870%
62
Binance
LINK-TRY$17.98
0.0067057 Eth
$365,482.00
19,650.270 LINK
0.0842%
63
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$17.96
0.0066938 Eth
$358,964.00
19,199.188 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0822%
64
OKX
LINK-USDC$17.85
0.0066551 Eth
$302,813.00
16,163.533 LINK
0.0692%
65
BitDelta
LINK-USDT$17.95
0.0066944 Eth
$295,909.00
15,916.000 LINK
0.0682%
66
Binance US
LINK-USDT$17.93
0.0066840 Eth
$240,804.00
13,429.614 LINK
0.0575%
67
BitMart
LINK-BTC$17.95
0.0066812 Eth
$238,088.00
13,265.380 LINK
0.0568%
68
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$17.98
0.0067036 Eth
$224,693.00
12,049.947 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0516%
69
Bitci TR
LINK-TRY$17.86
0.0066448 Eth
$191,624.00
10,231.970 LINK
0.0438%
70
WhiteBIT
LINK-EUR$17.89
0.0066680 Eth
$190,119.00
10,625.860 LINK
0.0455%
71
BitStorage
LINK-ETH$17.92
0.0066784 Eth
$185,085.00
10,327.330 LINK
0.0442%
72
Slex
LINK-ETH$17.94
0.0066855 Eth
$177,238.00
9,665.220 LINK
0.0414%
73
Gemini
LINK-BTC$17.89
0.0066705 Eth
$162,562.00
9,088.650 LINK
0.0389%
74
DeGate
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$17.98
0.0066850 Eth
$159,956.00
8,526.817 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0365%
75
CoinTR
LINK-TRY$17.93
0.0066759 Eth
$156,622.00
8,414.380 LINK
0.0360%
76
Coinbase Exchange
LINK-BTC$17.95
0.0066778 Eth
$146,127.00
8,141.170 LINK
0.0349%
77
Hotcoin
LINK-BTC$17.95
0.0066767 Eth
$140,758.00
7,843.400 LINK
0.0336%
78
BYDFi
LINK-USDC$17.95
0.0066847 Eth
$127,800.00
7,118.240 LINK
0.0305%
79
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$18.00
0.0067072 Eth
$122,577.00
6,603.937 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0283%
80
Uniswap V4 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$17.91
0.0066792 Eth
$113,178.00
118,584.215 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.5078%
81
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$18.04
0.0067224 Eth
$109,920.00
5,966.267 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0256%
82
Bitkub
LINK-THB$18.02
0.0067045 Eth
$99,118.00
5,500.280 LINK
0.0236%
83
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$17.96
0.0066938 Eth
$95,820.00
100,063.684 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.4285%
84
Bitso
LINK-USD$17.87
0.0066661 Eth
$84,076.00
4,705.520 LINK
0.0202%
85
KuCoin
LINK-USDC$17.92
0.0066804 Eth
$83,612.00
4,665.491 LINK
0.0200%
86
Uniswap V4 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$17.96
0.0066969 Eth
$77,286.00
4,167.553 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0178%
87
Kraken
LINK-GBP$17.95
0.0066986 Eth
$67,606.00
3,765.334 LINK
0.0161%
88
BitMart
LINK-ETH$17.93
0.0066758 Eth
$66,599.00
3,713.640 LINK
0.0159%
89
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$17.91
0.0066801 Eth
$52,546.00
2,862.244 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0123%
90
Binance
LINK-BNB$17.97
0.0066804 Eth
$48,328.00
2,618.107 LINK
0.0112%
91
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XDAC17F958D2EE523A2206206994597C13D831EC7$17.93
0.0066824 Eth
$41,843.00
2,240.785 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0096%
92
CoinEx
LINK-BTC$17.90
0.0066789 Eth
$40,844.00
2,181.605 LINK
0.0093%
93
Hotcoin
LINK-ETH$17.94
0.0066752 Eth
$39,336.00
2,192.380 LINK
0.0094%
94
Mercado Bitcoin
LINK-BRL$18.00
0.0067094 Eth
$35,864.00
1,992.542 LINK
0.0085%
95
Uniswap V4 (Arbitrum)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$18.01
0.0067011 Eth
$27,449.00
1,444.239 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0062%
96
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$17.91
0.0066630 Eth
$24,688.00
1,322.828 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0057%
97
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$17.88
0.0066643 Eth
$24,234.00
1,342.772 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0058%
98
Dex-Trade
LINK-ETH$17.89
0.0066746 Eth
$24,064.00
1,345.080 LINK
0.0058%
99
Bitexen
LINK-TRY$17.84
0.0066322 Eth
$12,884.52
722.354 LINK
0.0031%
100
Kanga
LINK-USDT$18.05
0.0067143 Eth
$7,495.61
0.000 LINK
0.0000%

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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