ETH Price: $2,590.61 (-2.76%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

734,004 ( 0.017%)

Market

Price

$18.02 @ 0.006956 ETH (-4.96%)

Onchain Market Cap

$18,020,000,000.00

Circulating Supply Market Cap

$11,496,096,702.00

Other Info

Token Contract (WITH 18 Decimals)

Filtered by Token Holder
Binance Dep: 0x3ca53a7A4c1AC56EDe547C166915168beae4b672
Balance
0 LINK

Value
$0.00
0x3ca53a7a4c1ac56ede547c166915168beae4b672
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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 16281.82% |ETH 0.0003846 1708.63%

Market

Volume (24H):$626,878,218.00
Market Capitalization:$11,496,096,702.00
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$18.07
0.0069579 Eth
$85,318,972.00
4,611,732.150 LINK
22.2882%
2
MEXC
LINK-USDT$18.01
0.0069329 Eth
$45,438,572.00
2,522,980.130 LINK
12.1934%
3
Coinbase Exchange
LINK-USD$17.97
0.0069415 Eth
$28,351,060.00
1,577,864.000 LINK
7.6257%
4
Bybit
LINK-USDT$18.04
0.0069464 Eth
$26,442,977.00
1,427,458.447 LINK
6.8988%
5
HTX
LINK-USDT$18.02
0.0069453 Eth
$19,435,881.00
1,042,012.897 LINK
5.0360%
6
P2B
LINK-USDT$18.01
0.0069272 Eth
$13,517,610.00
750,652.080 LINK
3.6278%
7
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$17.98
0.0069453 Eth
$10,858,600.00
588,522.165 0X514910771AF9CA656AF840DFF83E8264ECF986CA
2.8443%
8
DigiFinex
LINK-USDT$18.08
0.0069586 Eth
$10,043,101.00
555,588.300 LINK
2.6851%
9
XT.COM
LINK-USDT$17.89
0.0069084 Eth
$8,506,547.00
460,505.470 LINK
2.2256%
10
OKX
LINK-USDT$18.05
0.0069554 Eth
$8,427,559.00
453,948.480 LINK
2.1939%
11
Coinstore
LINK-USDT$17.95
0.0069338 Eth
$7,052,066.00
381,671.610 LINK
1.8446%
12
Binance
LINK-USDC$17.98
0.0069180 Eth
$7,030,060.00
379,890.170 LINK
1.8360%
13
WhiteBIT
LINK-USDT$18.11
0.0069733 Eth
$6,731,327.00
371,592.900 LINK
1.7959%
14
Bitunix
LINK-USDT$17.99
0.0069215 Eth
$5,671,897.00
315,318.280 LINK
1.5239%
15
KuCoin
LINK-USDT$18.04
0.0069450 Eth
$5,387,789.00
298,638.916 LINK
1.4433%
16
Binance
LINK-FDUSD$18.01
0.0069484 Eth
$5,081,451.00
273,116.320 LINK
1.3200%
17
Hotcoin
LINK-USDT$18.00
0.0069398 Eth
$4,840,206.00
268,956.380 LINK
1.2998%
18
BYDFi
LINK-USDT$18.00
0.0069346 Eth
$4,576,271.00
254,227.930 LINK
1.2287%
19
Azbit
LINK-USDT$17.85
0.0069709 Eth
$4,458,197.00
240,614.695 LINK
1.1629%
20
BTSE
LINK-USDT$17.85
0.0068951 Eth
$4,179,221.00
234,131.133 LINK
1.1315%
21
LBank
LINK-USDT$18.13
0.0069694 Eth
$4,090,401.00
225,632.840 LINK
1.0905%
22
Kraken
LINK-USD$18.03
0.0069469 Eth
$4,027,079.00
223,389.308 LINK
1.0796%
23
QMall
LINK-USDT$18.02
0.0069190 Eth
$3,505,592.00
189,828.296 LINK
0.9174%
24
LATOKEN
LINK-USDT$17.86
0.0069620 Eth
$3,367,114.00
188,487.825 LINK
0.9109%
25
Coinbase Exchange
LINK-EUR$17.91
0.0069000 Eth
$2,696,336.00
150,572.680 LINK
0.7277%
26
Dex-Trade
LINK-USDT$17.92
0.0069237 Eth
$2,439,154.00
136,098.390 LINK
0.6578%
27
Coinbase Exchange
LINK-GBP$18.01
0.0069342 Eth
$2,233,172.00
123,979.570 LINK
0.5992%
28
FMCPAY
LINK-USDT$17.93
0.0069205 Eth
$2,223,419.00
119,511.158 LINK
0.5776%
29
MEXC
LINK-USDC$17.83
0.0068861 Eth
$1,997,861.00
112,044.410 LINK
0.5415%
30
Bitvavo
LINK-EUR$18.03
0.0069489 Eth
$1,797,125.00
99,661.835 LINK
0.4817%
31
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$17.90
0.0069161 Eth
$1,691,373.00
92,044.390 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.4448%
32
Binance
LINK-BTC$18.01
0.0069314 Eth
$1,621,399.00
88,351.560 LINK
0.4270%
33
Biconomy.com
LINK-USDT$17.93
0.0069092 Eth
$1,489,922.00
79,999.260 LINK
0.3866%
34
PointPay
LINK-USDT$17.87
0.0069037 Eth
$1,372,620.00
74,528.385 LINK
0.3602%
35
FMCPAY
LINK-ETH$17.88
0.0069085 Eth
$1,249,879.00
67,871.360 LINK
0.3280%
36
CoinEx
LINK-USDT$17.83
0.0068887 Eth
$1,095,791.00
59,004.037 LINK
0.2852%
37
FMCPAY
LINK-BTC$17.93
0.0069183 Eth
$1,044,067.00
56,693.600 LINK
0.2740%
38
Binance
LINK-ETH$18.09
0.0069442 Eth
$896,465.00
48,618.030 LINK
0.2350%
39
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$17.97
0.0069293 Eth
$749,531.00
40,935.980 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.1978%
40
tanX
LINK-USDC$17.94
0.0069183 Eth
$737,694.00
39,617.310 LINK
0.1915%
41
BigONE
LINK-USDT$17.89
0.0068922 Eth
$715,970.00
40,027.320 LINK
0.1934%
42
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$17.98
0.0069350 Eth
$693,638.00
37,233.354 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1799%
43
Bitbank
LINK-JPY$17.94
0.0069304 Eth
$644,619.00
35,929.358 LINK
0.1736%
44
EXMO
LINK-USDT$18.01
0.0069436 Eth
$639,808.00
35,532.522 LINK
0.1717%
45
BitStorage
LINK-USDT$17.96
0.0069392 Eth
$626,832.00
34,897.690 LINK
0.1687%
46
Bitstamp
LINK-USD$17.86
0.0068825 Eth
$602,480.00
33,733.475 LINK
0.1630%
47
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$17.85
0.0068954 Eth
$570,044.00
63,035.752 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.3046%
48
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$18.02
0.0069477 Eth
$564,596.00
30,641.049 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1481%
49
QMall
LINK-USDC$18.02
0.0069442 Eth
$535,334.00
28,955.377 LINK
0.1399%
50
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$18.01
0.0069454 Eth
$514,644.00
27,784.605 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1343%
51
HashKey Exchange
LINK-USD$18.10
0.0069584 Eth
$491,657.00
26,542.901 LINK
0.1283%
52
Bybit
LINK-USDC$17.99
0.0069268 Eth
$473,665.00
25,710.701 LINK
0.1243%
53
Binance
LINK-TRY$18.06
0.0069507 Eth
$472,848.00
25,547.150 LINK
0.1235%
54
Gemini
LINK-USD$18.03
0.0069395 Eth
$466,343.00
25,869.305 LINK
0.1250%
55
GMO Japan
LINK-JPY$18.03
0.0069871 Eth
$442,757.00
24,560.000 LINK
0.1187%
56
WhiteBIT
LINK-BTC$17.91
0.0069839 Eth
$410,303.00
22,915.200 LINK
0.1107%
57
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$17.83
0.0068885 Eth
$407,993.00
22,149.928 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.1070%
58
WEEX
LINK-USDC$17.88
0.0069010 Eth
$403,698.00
21,750.200 LINK
0.1051%
59
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$18.03
0.0069514 Eth
$396,816.00
21,482.284 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1038%
60
Binance
LINK-EUR$18.00
0.0069299 Eth
$389,415.00
21,111.460 LINK
0.1020%
61
LATOKEN
LINK-BTC$18.06
0.0069491 Eth
$385,669.00
21,349.273 LINK
0.1032%
62
Coinbase Exchange
LINK-USDT$17.99
0.0069426 Eth
$366,921.00
20,392.952 LINK
0.0986%
63
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$18.02
0.0069608 Eth
$364,643.00
19,631.855 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0949%
64
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$18.01
0.0069454 Eth
$341,089.00
352,611.524 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
1.7041%
65
Bitstamp
LINK-EUR$17.96
0.0069206 Eth
$335,034.00
18,655.628 LINK
0.0902%
66
OKX
LINK-USDC$18.03
0.0069492 Eth
$328,718.00
17,865.387 LINK
0.0863%
67
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$17.97
0.0069414 Eth
$272,350.00
14,686.648 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0710%
68
BitDelta
LINK-USDT$18.04
0.0069250 Eth
$253,800.00
13,594.000 LINK
0.0657%
69
BitMart
LINK-BTC$17.99
0.0069337 Eth
$248,955.00
13,836.360 LINK
0.0669%
70
Slex
LINK-ETH$18.00
0.0069759 Eth
$197,618.00
10,730.710 LINK
0.0519%
71
Bitci TR
LINK-TRY$18.11
0.0069721 Eth
$190,678.00
10,207.780 LINK
0.0493%
72
BitStorage
LINK-ETH$17.95
0.0069153 Eth
$184,613.00
10,286.620 LINK
0.0497%
73
Hotcoin
LINK-BTC$18.02
0.0069731 Eth
$178,785.00
9,919.060 LINK
0.0479%
74
BYDFi
LINK-USDC$18.07
0.0069737 Eth
$171,140.00
9,471.430 LINK
0.0458%
75
DeGate
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$17.93
0.0069134 Eth
$165,588.00
8,944.056 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0432%
76
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$17.96
0.0069362 Eth
$138,112.00
7,580.427 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0366%
77
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$17.90
0.0069161 Eth
$122,893.00
126,992.753 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.6137%
78
Bitkub
LINK-THB$18.02
0.0069483 Eth
$122,268.00
6,785.667 LINK
0.0328%
79
WhiteBIT
LINK-TRY$18.18
0.0070028 Eth
$119,022.00
6,546.740 LINK
0.0316%
80
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$18.00
0.0069427 Eth
$117,321.00
6,407.649 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0310%
81
KuCoin
LINK-USDC$18.05
0.0069496 Eth
$115,122.00
6,376.886 LINK
0.0308%
82
Bitso
LINK-USD$17.89
0.0068951 Eth
$110,959.00
6,200.759 LINK
0.0300%
83
Uniswap V4 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$18.07
0.0069801 Eth
$99,037.00
102,095.453 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.4934%
84
KuCoin
LINK-BTC$18.03
0.0069398 Eth
$77,446.00
4,295.940 LINK
0.0208%
85
Binance
LINK-BNB$17.93
0.0069196 Eth
$66,698.00
3,564.957 LINK
0.0172%
86
Mercado Bitcoin
LINK-BRL$17.98
0.0069448 Eth
$57,093.00
3,175.925 LINK
0.0153%
87
PancakeSwap (v2)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$17.98
0.0069202 Eth
$55,342.00
2,949.306 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0143%
88
Tokenize
LINK-ETH$17.99
0.0069025 Eth
$53,011.00
2,947.098 LINK
0.0142%
89
Uniswap V4 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$17.96
0.0069128 Eth
$51,929.00
2,822.048 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0136%
90
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XDAC17F958D2EE523A2206206994597C13D831EC7$17.91
0.0069187 Eth
$49,433.00
2,660.559 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0129%
91
Hotcoin
LINK-ETH$17.96
0.0069859 Eth
$48,978.00
2,727.710 LINK
0.0132%
92
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$18.03
0.0069528 Eth
$45,796.00
2,488.240 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0120%
93
Binance US
LINK-USDT$17.91
0.0069051 Eth
$44,685.00
2,495.527 LINK
0.0121%
94
Binance
LINK-BRL$17.98
0.0069200 Eth
$39,640.00
2,143.610 LINK
0.0104%
95
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$18.01
0.0069454 Eth
$27,862.00
1,511.283 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0073%
96
Dex-Trade
LINK-ETH$18.00
0.0069411 Eth
$26,014.00
1,445.230 LINK
0.0070%
97
Uniswap V3 (Avalanche)
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$18.07
0.0069676 Eth
$24,388.00
1,334.962 0X5947BB275C521040051D82396192181B413227A3
0.0065%
98
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$18.13
0.0069564 Eth
$20,593.00
1,101.558 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0053%
99
THENA FUSION
0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$17.97
0.0069278 Eth
$20,135.00
29.488 0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827
0.0001%
100
Bitexen
LINK-TRY$17.75
0.0068392 Eth
$14,422.16
812.349 LINK
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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