ETH Price: $2,703.37 (+2.62%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

736,574 ( 0.018%)

Market

Price

$17.95 @ 0.006640 ETH (+2.24%)

Onchain Market Cap

$17,950,000,000.00

Circulating Supply Market Cap

$11,445,457,098.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
0 LINK

Value
$0.00
0x2abf24292bc2949e2a8ab5940b12bd26f3bb4af2
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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 16218.18% |ETH 0.0003846 1626.47%

Market

Volume (24H):$570,427,470.00
Market Capitalization:$11,445,457,098.00
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
Coinbase Exchange
LINK-USD$17.96
0.0066252 Eth
$25,267,657.00
1,406,571.850 LINK
9.6316%
2
Bybit
LINK-USDT$17.91
0.0066088 Eth
$23,697,448.00
1,332,782.778 LINK
9.1263%
3
HTX
LINK-USDT$17.92
0.0066174 Eth
$20,758,007.00
1,166,561.072 LINK
7.9881%
4
P2B
LINK-USDT$17.96
0.0066247 Eth
$13,154,685.00
732,526.300 LINK
5.0160%
5
Bitget
LINK-USDT$17.92
0.0066104 Eth
$11,321,585.00
636,804.829 LINK
4.3606%
6
Slex
LINK-USDT$17.95
0.0066218 Eth
$10,392,815.00
584,186.460 LINK
4.0003%
7
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$17.99
0.0066332 Eth
$9,633,856.00
535,021.285 0X514910771AF9CA656AF840DFF83E8264ECF986CA
3.6636%
8
Gate.io
LINK-USDT$17.93
0.0066144 Eth
$8,351,683.00
470,750.780 LINK
3.2235%
9
DigiFinex
LINK-USDT$17.94
0.0066188 Eth
$7,876,237.00
439,067.890 LINK
3.0066%
10
OKX
LINK-USDT$17.93
0.0066145 Eth
$7,784,785.00
438,071.945 LINK
2.9997%
11
XT.COM
LINK-USDT$17.99
0.0066352 Eth
$6,299,757.00
354,564.870 LINK
2.4279%
12
MEXC
LINK-EUR$17.95
0.0066158 Eth
$5,987,679.00
333,542.160 LINK
2.2840%
13
KuCoin
LINK-USDT$17.92
0.0066127 Eth
$5,868,751.00
327,459.911 LINK
2.2423%
14
MEXC
LINK-USDC$17.93
0.0066146 Eth
$5,667,894.00
316,159.470 LINK
2.1649%
15
Hotcoin
LINK-USDT$17.97
0.0066183 Eth
$5,422,517.00
301,793.670 LINK
2.0666%
16
Coinstore
LINK-USDT$17.95
0.0066213 Eth
$5,383,145.00
302,900.670 LINK
2.0741%
17
Kraken
LINK-USD$17.98
0.0066332 Eth
$5,058,148.00
281,280.429 LINK
1.9261%
18
CoinW
LINK-USDT$17.96
0.0066253 Eth
$4,843,006.00
269,664.960 LINK
1.8466%
19
WhiteBIT
LINK-USDT$17.99
0.0066352 Eth
$4,822,190.00
268,030.160 LINK
1.8354%
20
Binance
LINK-USDC$17.92
0.0066099 Eth
$4,706,072.00
265,019.720 LINK
1.8147%
21
Binance
LINK-FDUSD$17.87
0.0065929 Eth
$4,378,912.00
246,762.170 LINK
1.6897%
22
Bitunix
LINK-USDT$17.95
0.0066236 Eth
$3,859,808.00
214,916.840 LINK
1.4717%
23
Azbit
LINK-USDT$17.99
0.0066362 Eth
$3,796,945.00
213,745.299 LINK
1.4636%
24
BTSE
LINK-USDT$17.96
0.0066261 Eth
$3,765,763.00
209,692.286 LINK
1.4359%
25
BYDFi
LINK-USDT$17.92
0.0066104 Eth
$3,604,125.00
201,169.670 LINK
1.3775%
26
LATOKEN
LINK-USDT$17.94
0.0066181 Eth
$2,987,132.00
166,535.344 LINK
1.1404%
27
QMall
LINK-USDT$17.96
0.0066222 Eth
$2,450,016.00
137,744.857 LINK
0.9432%
28
Bitvavo
LINK-EUR$17.94
0.0066199 Eth
$2,258,520.00
125,861.370 LINK
0.8618%
29
Dex-Trade
LINK-USDT$17.97
0.0066270 Eth
$2,088,756.00
116,242.070 LINK
0.7960%
30
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$17.98
0.0066301 Eth
$1,965,433.00
109,409.661 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.7492%
31
Binance
LINK-BTC$17.95
0.0066140 Eth
$1,860,615.00
103,639.590 LINK
0.7097%
32
FMCPAY
LINK-USDT$17.97
0.0066270 Eth
$1,768,408.00
99,620.700 LINK
0.6822%
33
Coinbase Exchange
LINK-GBP$17.91
0.0066081 Eth
$1,551,642.00
86,621.400 LINK
0.5931%
34
Biconomy.com
LINK-USDT$17.94
0.0066179 Eth
$1,371,271.00
77,140.250 LINK
0.5282%
35
CoinEx
LINK-USDT$17.98
0.0066329 Eth
$1,262,216.00
71,139.505 LINK
0.4871%
36
FMCPAY
LINK-ETH$17.97
0.0066292 Eth
$1,134,319.00
63,051.040 LINK
0.4317%
37
Coinbase Exchange
LINK-EUR$17.98
0.0066338 Eth
$999,803.00
55,608.530 LINK
0.3808%
38
FMCPAY
LINK-BTC$17.98
0.0066301 Eth
$964,160.00
53,753.400 LINK
0.3681%
39
PointPay
LINK-USDT$17.96
0.0066256 Eth
$947,543.00
53,239.178 LINK
0.3646%
40
Binance
LINK-ETH$17.95
0.0066220 Eth
$801,944.00
44,664.450 LINK
0.3058%
41
Trubit
LINK-USDT$17.94
0.0066181 Eth
$768,750.00
43,254.120 LINK
0.2962%
42
LATOKEN
LINK-BTC$17.98
0.0066335 Eth
$709,486.00
39,462.800 LINK
0.2702%
43
tanX
LINK-USDC$17.97
0.0066259 Eth
$701,070.00
39,394.150 LINK
0.2698%
44
EXMO
LINK-USDT$18.00
0.0066401 Eth
$694,381.00
38,574.270 LINK
0.2641%
45
Phemex
LINK-USDT$17.99
0.0066344 Eth
$693,326.00
38,541.620 LINK
0.2639%
46
BigONE
LINK-USDT$17.91
0.0066080 Eth
$690,414.00
38,540.380 LINK
0.2639%
47
Tapbit
LINK-USDT$17.95
0.0066218 Eth
$675,754.00
37,987.350 LINK
0.2601%
48
WhiteBIT
LINK-BTC$17.96
0.0066280 Eth
$585,104.00
32,569.390 LINK
0.2230%
49
OKX
LINK-USDC$17.94
0.0066189 Eth
$545,828.00
30,995.689 LINK
0.2122%
50
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$18.00
0.0066376 Eth
$535,250.00
30,183.380 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.2067%
51
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$18.01
0.0066419 Eth
$519,874.00
29,170.771 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1997%
52
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$17.99
0.0066343 Eth
$482,976.00
50,115.152 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.3432%
53
Bitbank
LINK-JPY$17.92
0.0066038 Eth
$434,461.00
24,242.249 LINK
0.1660%
54
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$17.98
0.0066308 Eth
$414,002.00
23,031.872 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1577%
55
itBit
LINK-USD$17.97
0.0066303 Eth
$400,966.00
22,313.054 LINK
0.1528%
56
EarnBIT
LINK-USDT$17.99
0.0066341 Eth
$360,250.00
20,237.695 LINK
0.1386%
57
QMall
LINK-USDC$17.90
0.0066156 Eth
$359,190.00
20,208.409 LINK
0.1384%
58
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$18.00
0.0066376 Eth
$352,358.00
348,226.102 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
2.3845%
59
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$18.02
0.0066457 Eth
$341,101.00
19,213.396 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.1316%
60
Binance
LINK-TRY$17.99
0.0066313 Eth
$324,333.00
18,254.070 LINK
0.1250%
61
Binance
LINK-EUR$17.96
0.0066240 Eth
$321,330.00
18,149.330 LINK
0.1243%
62
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$17.97
0.0066289 Eth
$318,233.00
17,675.794 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1210%
63
Bybit
LINK-USDC$17.95
0.0066274 Eth
$303,006.00
17,067.246 LINK
0.1169%
64
Gemini
LINK-USD$17.99
0.0066390 Eth
$295,292.00
16,411.202 LINK
0.1124%
65
Slex
LINK-ETH$18.00
0.0066401 Eth
$286,666.00
15,929.390 LINK
0.1091%
66
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$17.87
0.0065934 Eth
$270,958.00
15,059.591 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.1031%
67
GMO Japan
LINK-JPY$17.91
0.0066040 Eth
$263,550.00
14,718.200 LINK
0.1008%
68
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$17.94
0.0066186 Eth
$254,696.00
14,154.065 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0969%
69
BitDelta
LINK-USDT$17.99
0.0066344 Eth
$229,470.00
12,912.000 LINK
0.0884%
70
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$17.99
0.0066343 Eth
$204,331.00
11,500.094 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0787%
71
Bitbegin
LINK-USDT$17.97
0.0066279 Eth
$201,572.00
11,331.268 LINK
0.0776%
72
CoinTR
LINK-TRY$17.99
0.0066339 Eth
$192,236.00
10,785.280 LINK
0.0739%
73
Hotcoin
LINK-BTC$17.98
0.0066305 Eth
$190,827.00
10,616.160 LINK
0.0727%
74
BitStorage
LINK-ETH$17.93
0.0066153 Eth
$183,690.00
10,242.800 LINK
0.0701%
75
Bitci TR
LINK-TRY$18.05
0.0066564 Eth
$179,122.00
10,050.070 LINK
0.0688%
76
BYDFi
LINK-USDC$17.95
0.0066227 Eth
$168,547.00
9,388.690 LINK
0.0643%
77
WhiteBIT
LINK-TRY$17.97
0.0066313 Eth
$134,923.00
7,506.620 LINK
0.0514%
78
Uniswap V2 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$17.96
0.0066233 Eth
$129,295.00
7,222.311 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0495%
79
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$18.00
0.0066373 Eth
$117,500.00
6,566.007 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0450%
80
DeGate
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$17.97
0.0066238 Eth
$111,756.00
6,288.623 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0431%
81
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$17.96
0.0066244 Eth
$100,391.00
5,596.814 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0383%
82
Binance
LINK-BNB$17.96
0.0066261 Eth
$87,202.00
4,851.075 LINK
0.0332%
83
KuCoin
LINK-USDC$18.00
0.0066386 Eth
$77,719.00
4,318.437 LINK
0.0296%
84
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$17.98
0.0066297 Eth
$60,749.00
60,023.012 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.4110%
85
Uniswap V4 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$17.97
0.0066269 Eth
$59,487.00
58,977.630 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.4039%
86
Bitkub
LINK-THB$17.82
0.0065677 Eth
$55,603.00
3,120.070 LINK
0.0214%
87
Bitso
LINK-USD$17.94
0.0066174 Eth
$55,399.00
3,087.889 LINK
0.0211%
88
Hotcoin
LINK-ETH$17.92
0.0066153 Eth
$53,153.00
2,966.380 LINK
0.0203%
89
Uniswap V3 (Avalanche)
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$17.83
0.0065760 Eth
$51,631.00
2,942.050 0X5947BB275C521040051D82396192181B413227A3
0.0201%
90
Uniswap V4 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$17.95
0.0066224 Eth
$50,429.00
2,803.141 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0192%
91
Binance US
LINK-USDT$17.93
0.0066062 Eth
$50,200.00
2,800.331 LINK
0.0192%
92
EXMO
LINK-BTC$18.01
0.0066447 Eth
$45,728.00
2,538.536 LINK
0.0174%
93
Binance
LINK-BRL$18.00
0.0066328 Eth
$39,670.00
2,242.420 LINK
0.0154%
94
Uniswap V4 (Ethereum)
0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48-0X514910771AF9CA656AF840DFF83E8264ECF986CA$17.93
0.0066132 Eth
$38,651.00
38,204.302 0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48
0.2616%
95
BTCMarkets
LINK-AUD$18.00
0.0066387 Eth
$27,371.00
1,520.951 LINK
0.0104%
96
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XDAC17F958D2EE523A2206206994597C13D831EC7$17.97
0.0066286 Eth
$26,523.00
1,493.299 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0102%
97
KuCoin
LINK-BTC$17.98
0.0066335 Eth
$26,011.00
1,446.784 LINK
0.0099%
98
Dex-Trade
LINK-ETH$17.89
0.0065991 Eth
$24,672.00
1,379.220 LINK
0.0094%
99
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$18.00
0.0066400 Eth
$17,744.08
996.923 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0068%
100
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X1BFD67037B42CF73ACF2047067BD4F2C47D9BFD6$18.00
0.0066376 Eth
$17,024.10
964.416 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0066%

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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