ETH Price: $2,437.44 (-1.51%)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

722,546 ( 0.006%)

Market

Price

$10.61 @ 0.004353 ETH (-0.74%)

Onchain Market Cap

$10,610,000,000.00

Circulating Supply Market Cap

$6,648,608,038.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
39.66 LINK

Value
$420.79 ( ~0.172636209963623 Eth) [0.0000%]
0x5f71401768e110e7c577ac7f0488564571adfc8b
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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 9545.45% |ETH 0.0003846 1031.83%

Market

Volume (24H):$444,483,147.00
Market Capitalization:$6,648,608,038.00
Circulating Supply:626,849,971.00 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$10.61
0.0043500 Eth
$31,822,760.00
3,064,815.670 LINK
15.1979%
2
WhiteBIT
LINK-USDT$10.59
0.0043457 Eth
$30,554,175.00
2,884,117.890 LINK
14.3019%
3
HTX
LINK-USDT$10.60
0.0043505 Eth
$11,692,054.00
1,123,673.683 LINK
5.5721%
4
Coinbase Exchange
LINK-USD$10.61
0.0043484 Eth
$11,377,284.00
1,072,721.440 LINK
5.3194%
5
Gate.io
LINK-USDT$10.61
0.0043538 Eth
$10,277,720.00
1,006,467.670 LINK
4.9909%
6
Bitget
LINK-USDT$10.61
0.0043513 Eth
$9,436,487.00
905,868.060 LINK
4.4920%
7
Bybit
LINK-USDT$10.60
0.0043499 Eth
$8,864,748.00
854,402.985 LINK
4.2368%
8
OKX
LINK-USDT$10.60
0.0043485 Eth
$6,877,250.00
665,284.624 LINK
3.2990%
9
P2B
LINK-USDT$10.61
0.0043481 Eth
$6,670,075.00
628,945.920 LINK
3.1188%
10
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$10.60
0.0043472 Eth
$6,294,611.00
603,633.744 0X514910771AF9CA656AF840DFF83E8264ECF986CA
2.9933%
11
Slex
LINK-USDT$10.59
0.0043440 Eth
$5,613,207.00
539,682.090 LINK
2.6762%
12
BTSE
LINK-USDT$10.60
0.0043491 Eth
$5,473,434.00
516,457.814 LINK
2.5610%
13
Upbit
LINK-KRW$10.71
0.0043938 Eth
$4,626,329.00
431,911.334 LINK
2.1418%
14
DigiFinex
LINK-USDT$10.60
0.0043485 Eth
$4,424,876.00
417,412.720 LINK
2.0699%
15
Bitunix
LINK-USDT$10.62
0.0043539 Eth
$4,228,346.00
398,011.070 LINK
1.9737%
16
Biconomy.com
LINK-USDT$10.60
0.0043493 Eth
$3,808,833.00
366,665.470 LINK
1.8182%
17
Azbit
LINK-USDT$10.61
0.0043548 Eth
$3,536,021.00
338,575.880 LINK
1.6789%
18
CoinW
LINK-USDT$10.60
0.0043472 Eth
$3,339,188.00
315,056.050 LINK
1.5623%
19
XT.COM
LINK-USDT$10.62
0.0043520 Eth
$3,199,355.00
307,876.610 LINK
1.5267%
20
Hotcoin
LINK-USDT$10.62
0.0043532 Eth
$2,855,243.00
268,941.360 LINK
1.3336%
21
Trubit
LINK-USDT$10.60
0.0043493 Eth
$2,185,299.00
210,592.950 LINK
1.0443%
22
Coinstore
LINK-USDT$10.60
0.0043443 Eth
$2,116,910.00
203,896.010 LINK
1.0111%
23
LBank
LINK-USDT$10.60
0.0043464 Eth
$2,010,022.00
189,714.040 LINK
0.9408%
24
KuCoin
LINK-USDT$10.61
0.0043517 Eth
$1,998,942.00
188,424.475 LINK
0.9344%
25
AscendEX (BitMax)
LINK-USDT$10.56
0.0043331 Eth
$1,775,066.00
168,102.200 LINK
0.8336%
26
BYDFi
LINK-USDT$10.60
0.0043477 Eth
$1,616,284.00
152,416.680 LINK
0.7558%
27
ProBit Global
LINK-USDT$10.61
0.0043524 Eth
$1,582,666.00
149,217.708 LINK
0.7399%
28
Bitstamp
LINK-EUR$10.61
0.0043543 Eth
$1,506,333.00
141,923.200 LINK
0.7038%
29
Bitvavo
LINK-EUR$10.61
0.0043528 Eth
$1,490,094.00
140,424.840 LINK
0.6963%
30
WhiteBIT
LINK-BTC$10.61
0.0043531 Eth
$1,121,871.00
105,722.530 LINK
0.5243%
31
Dex-Trade
LINK-USDT$10.60
0.0043516 Eth
$1,053,223.00
99,323.120 LINK
0.4925%
32
Tokpie
LINK-USDT$10.57
0.0043376 Eth
$988,565.00
93,486.969 LINK
0.4636%
33
Bithumb
LINK-KRW$10.71
0.0043948 Eth
$945,463.00
88,267.871 LINK
0.4377%
34
HashKey Global
LINK-USDT$10.61
0.0043507 Eth
$906,917.00
87,955.768 LINK
0.4362%
35
Azbit
LINK-ETH$10.60
0.0043459 Eth
$692,109.00
66,136.525 LINK
0.3280%
36
EXMO
LINK-USDT$10.60
0.0043485 Eth
$677,532.00
63,926.773 LINK
0.3170%
37
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$10.58
0.0043393 Eth
$656,883.00
63,045.767 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.3126%
38
LATOKEN
LINK-USDT$10.60
0.0043482 Eth
$625,607.00
59,002.209 LINK
0.2926%
39
AscendEX (BitMax)
LINK-BTC$10.63
0.0043627 Eth
$582,413.00
54,780.900 LINK
0.2716%
40
BigONE
LINK-USDT$10.61
0.0043525 Eth
$546,727.00
51,547.390 LINK
0.2556%
41
Kraken
LINK-USDT$10.60
0.0043486 Eth
$528,593.00
49,868.816 LINK
0.2473%
42
tanX
LINK-USDC$10.62
0.0043495 Eth
$510,947.00
48,968.330 LINK
0.2428%
43
itBit
LINK-USD$10.61
0.0043523 Eth
$479,064.00
45,152.136 LINK
0.2239%
44
CoinEx
LINK-USDT$10.60
0.0043500 Eth
$466,910.00
44,912.348 LINK
0.2227%
45
PointPay
LINK-USDT$10.62
0.0043521 Eth
$414,584.00
39,952.824 LINK
0.1981%
46
ProBit Global
LINK-BTC$10.61
0.0043543 Eth
$408,454.00
38,481.799 LINK
0.1908%
47
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$10.61
0.0043515 Eth
$393,840.00
37,796.606 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1874%
48
WhiteBIT
LINK-EUR$10.62
0.0043537 Eth
$392,744.00
36,986.440 LINK
0.1834%
49
Bybit
LINK-USDC$10.63
0.0043596 Eth
$336,986.00
32,413.613 LINK
0.1607%
50
Phemex
LINK-USDT$10.60
0.0043466 Eth
$328,630.00
31,016.230 LINK
0.1538%
51
EarnBIT
LINK-USDT$10.61
0.0043520 Eth
$323,779.00
31,350.034 LINK
0.1555%
52
Coinbase Exchange
LINK-EUR$10.60
0.0043493 Eth
$315,198.00
29,727.740 LINK
0.1474%
53
WhiteBIT
LINK-TRY$10.63
0.0043625 Eth
$293,117.00
27,563.540 LINK
0.1367%
54
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$10.61
0.0043517 Eth
$268,620.00
25,639.286 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1271%
55
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$10.60
0.0043494 Eth
$250,805.00
23,660.303 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1173%
56
LATOKEN
LINK-BTC$10.62
0.0043526 Eth
$232,725.00
21,911.340 LINK
0.1087%
57
BitDelta
LINK-USDT$10.61
0.0043501 Eth
$215,610.00
20,704.000 LINK
0.1027%
58
BitMart
LINK-BTC$10.62
0.0043557 Eth
$199,410.00
18,781.060 LINK
0.0931%
59
Slex
LINK-ETH$10.59
0.0043408 Eth
$182,347.00
17,431.420 LINK
0.0864%
60
Bitbank
LINK-JPY$10.66
0.0043741 Eth
$169,788.00
15,922.634 LINK
0.0790%
61
BYDFi
LINK-USDC$10.63
0.0043569 Eth
$162,226.00
15,265.950 LINK
0.0757%
62
Binance
LINK-EUR$10.62
0.0043497 Eth
$157,608.00
15,138.460 LINK
0.0751%
63
Gemini
LINK-USD$10.62
0.0043583 Eth
$140,696.00
13,242.262 LINK
0.0657%
64
OKX
LINK-USDC$10.61
0.0043503 Eth
$138,148.00
13,265.984 LINK
0.0658%
65
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$10.57
0.0043361 Eth
$125,960.00
12,034.033 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0597%
66
Coinbase Exchange
LINK-GBP$10.64
0.0043627 Eth
$121,248.00
11,400.270 LINK
0.0565%
67
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$10.49
0.0043022 Eth
$121,216.00
11,607.737 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0576%
68
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$10.57
0.0043373 Eth
$121,040.00
118,567.897 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.5880%
69
GMO Japan
LINK-JPY$10.62
0.0043564 Eth
$115,068.00
10,839.300 LINK
0.0538%
70
Bitci TR
LINK-TRY$10.57
0.0043368 Eth
$106,547.00
10,186.230 LINK
0.0505%
71
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$10.60
0.0043498 Eth
$105,470.00
10,144.395 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0503%
72
Bitkub
LINK-THB$10.62
0.0043536 Eth
$90,688.00
8,541.897 LINK
0.0424%
73
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$10.58
0.0043413 Eth
$87,615.00
8,667.627 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0430%
74
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$10.59
0.0043401 Eth
$86,839.00
84,805.126 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.4205%
75
Mercado Bitcoin
LINK-BRL$10.61
0.0043561 Eth
$84,375.00
7,948.744 LINK
0.0394%
76
Slex
LINK-BTC$10.61
0.0043503 Eth
$70,992.00
6,770.500 LINK
0.0336%
77
Bitso
LINK-USD$10.61
0.0043538 Eth
$63,735.00
6,004.997 LINK
0.0298%
78
PointPay
LINK-BTC$10.60
0.0043468 Eth
$47,975.00
4,577.361 LINK
0.0227%
79
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$10.57
0.0043373 Eth
$45,396.00
4,390.489 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0218%
80
EXMO
LINK-BTC$10.60
0.0043478 Eth
$33,694.00
3,178.934 LINK
0.0158%
81
Bitcointry
LINK-USDT$10.61
0.0043501 Eth
$32,962.00
3,170.275 LINK
0.0157%
82
Binance US
LINK-USDT$10.59
0.0043475 Eth
$32,222.00
3,041.528 LINK
0.0151%
83
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$10.57
0.0043378 Eth
$27,730.00
2,663.806 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0132%
84
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$10.60
0.0043494 Eth
$25,749.00
25,198.276 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.1250%
85
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$10.57
0.0043352 Eth
$23,527.00
2,252.422 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0112%
86
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$10.58
0.0043405 Eth
$21,104.00
2,023.573 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0100%
87
BTCMarkets
LINK-AUD$10.49
0.0043041 Eth
$18,772.81
1,789.165 LINK
0.0089%
88
CoinEx
LINK-USDC$10.56
0.0043334 Eth
$18,584.93
1,788.116 LINK
0.0089%
89
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$10.56
0.0043336 Eth
$18,278.27
1,766.734 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0088%
90
CoinEx
LINK-BTC$10.58
0.0043359 Eth
$17,617.88
1,684.226 LINK
0.0084%
91
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$10.56
0.0043306 Eth
$16,863.74
1,613.920 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0080%
92
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$10.57
0.0043373 Eth
$16,328.86
1,545.686 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0077%
93
Coinone
LINK-KRW$10.72
0.0043984 Eth
$14,258.72
1,330.286 LINK
0.0066%
94
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$10.58
0.0043393 Eth
$9,893.57
9,696.201 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.0481%
95
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$10.61
0.0043530 Eth
$8,879.51
853.432 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0042%
96
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X1BFD67037B42CF73ACF2047067BD4F2C47D9BFD6$10.57
0.0043373 Eth
$8,280.52
793.411 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0039%
97
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$10.56
0.0043313 Eth
$7,083.11
681.854 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0034%
98
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X55D398326F99059FF775485246999027B3197955$10.60
0.0043468 Eth
$5,741.84
550.686 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0027%
99
THENA FUSION
0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$10.57
0.0043378 Eth
$4,376.10
7.125 0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827
0.0000%
100
KuCoin
LINK-KCS$10.59
0.0043452 Eth
$3,654.46
344.993 LINK
0.0017%

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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