ETH Price: $2,642.43 (+1.06%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

721,859 ( 0.003%)

Market

Price

$11.45 @ 0.004333 ETH (+2.26%)

Onchain Market Cap

$11,450,000,000.00

Circulating Supply Market Cap

$7,179,910,402.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
199.5418 LINK

Value
$2,284.75 ( ~0.864641295590652 Eth) [0.0000%]
0x772883066db2f533db1a03e3e6360d8215cd1442
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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 10309.09% |ETH 0.0003846 1026.63%

Market

Volume (24H):$307,983,059.00
Market Capitalization:$7,179,910,402.00
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
Coinbase Exchange
LINK-USD$11.45
0.0043326 Eth
$12,965,083.00
1,132,420.590 LINK
9.6136%
2
WhiteBIT
LINK-USDT$11.46
0.0043378 Eth
$11,637,161.00
1,015,183.660 LINK
8.6183%
3
HTX
LINK-USDT$11.48
0.0043440 Eth
$10,447,121.00
915,142.958 LINK
7.7690%
4
Bitget
LINK-USDT$11.46
0.0043361 Eth
$8,502,078.00
745,290.394 LINK
6.3271%
5
Bybit
LINK-USDT$11.48
0.0043442 Eth
$7,281,782.00
638,208.359 LINK
5.4180%
6
Azbit
LINK-USDT$11.45
0.0043346 Eth
$4,795,633.00
420,284.950 LINK
3.5680%
7
FameEX
LINK-USDT$11.46
0.0043385 Eth
$4,743,625.00
414,035.503 LINK
3.5149%
8
P2B
LINK-USDT$11.46
0.0043360 Eth
$4,680,613.00
408,507.120 LINK
3.4680%
9
WEEX
LINK-USDT$11.45
0.0043321 Eth
$4,222,712.00
369,754.850 LINK
3.1390%
10
Slex
LINK-USDT$11.46
0.0043365 Eth
$3,888,591.00
340,590.360 LINK
2.8914%
11
BTSE
LINK-USDT$11.45
0.0043322 Eth
$3,648,574.00
318,713.169 LINK
2.7057%
12
Biconomy.com
LINK-USDT$11.46
0.0043380 Eth
$3,648,499.00
319,542.720 LINK
2.7127%
13
OKX
LINK-USDT$11.45
0.0043333 Eth
$3,543,502.00
310,159.160 LINK
2.6331%
14
DigiFinex
LINK-USDT$11.46
0.0043388 Eth
$2,993,935.00
261,143.110 LINK
2.2169%
15
Upbit
LINK-KRW$11.42
0.0043203 Eth
$2,768,793.00
242,536.703 LINK
2.0590%
16
Deepcoin
LINK-USDT$11.45
0.0043322 Eth
$2,283,774.00
203,860.420 LINK
1.7307%
17
CoinW
LINK-USDT$11.45
0.0043327 Eth
$2,088,563.00
182,412.100 LINK
1.5486%
18
XT.COM
LINK-USDT$11.45
0.0043307 Eth
$2,049,847.00
179,615.330 LINK
1.5248%
19
ProBit Global
LINK-USDT$11.46
0.0043375 Eth
$1,912,321.00
166,853.121 LINK
1.4165%
20
Gate.io
LINK-USDT$11.45
0.0043333 Eth
$1,875,494.00
164,208.570 LINK
1.3940%
21
Trubit
LINK-USDT$11.47
0.0043403 Eth
$1,860,508.00
163,185.000 LINK
1.3853%
22
LBank
LINK-USDT$11.47
0.0043399 Eth
$1,740,335.00
151,759.420 LINK
1.2883%
23
AscendEX (BitMax)
LINK-USDT$11.45
0.0043311 Eth
$1,730,317.00
151,179.200 LINK
1.2834%
24
Bitunix
LINK-USDT$11.46
0.0043384 Eth
$1,715,403.00
149,675.280 LINK
1.2707%
25
Bitexen
LINK-TRY$11.46
0.0043379 Eth
$1,691,279.00
147,549.640 LINK
1.2526%
26
Coinstore
LINK-USDT$11.47
0.0043383 Eth
$1,664,409.00
145,829.350 LINK
1.2380%
27
C-Patex
LINK-USDT$11.46
0.0043353 Eth
$1,585,139.00
138,327.282 LINK
1.1743%
28
KuCoin
LINK-USDT$11.46
0.0043387 Eth
$1,512,104.00
131,896.423 LINK
1.1197%
29
BYDFi
LINK-USDT$11.46
0.0043365 Eth
$1,129,563.00
98,576.640 LINK
0.8369%
30
HashKey Global
LINK-USDT$11.46
0.0043364 Eth
$1,042,819.00
91,389.853 LINK
0.7758%
31
Kraken
LINK-USD$11.48
0.0043441 Eth
$1,033,524.00
90,036.603 LINK
0.7644%
32
WhiteBIT
LINK-BTC$11.46
0.0043372 Eth
$932,740.00
81,379.610 LINK
0.6909%
33
Hotcoin
LINK-USDT$11.46
0.0043344 Eth
$890,531.00
77,726.510 LINK
0.6599%
34
Azbit
LINK-ETH$11.44
0.0043307 Eth
$874,980.00
76,545.583 LINK
0.6498%
35
Bitexen
LINK-USDT$11.45
0.0043333 Eth
$789,484.00
68,949.000 LINK
0.5853%
36
Dex-Trade
LINK-USDT$11.46
0.0043346 Eth
$765,165.00
66,796.070 LINK
0.5671%
37
Bitvavo
LINK-EUR$11.45
0.0043336 Eth
$744,561.00
65,015.681 LINK
0.5519%
38
LATOKEN
LINK-USDT$11.46
0.0043345 Eth
$706,946.00
61,702.451 LINK
0.5238%
39
FMFW.io
LINK-USDT$11.45
0.0043332 Eth
$652,822.00
57,009.830 LINK
0.4840%
40
AscendEX (BitMax)
LINK-BTC$11.43
0.0043271 Eth
$577,774.00
50,527.100 LINK
0.4289%
41
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$11.46
0.0043379 Eth
$577,450.00
49,966.953 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.4242%
42
Bithumb
LINK-KRW$11.40
0.0043143 Eth
$532,581.00
46,711.953 LINK
0.3966%
43
BigONE
LINK-USDT$11.45
0.0043347 Eth
$469,119.00
40,955.150 LINK
0.3477%
44
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$11.42
0.0043212 Eth
$463,166.00
40,684.218 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.3454%
45
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$11.46
0.0043373 Eth
$462,129.00
40,442.566 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.3433%
46
EXMO
LINK-USDT$11.46
0.0043358 Eth
$423,371.00
36,954.352 LINK
0.3137%
47
Crypto.com Exchange
LINK-USD$11.47
0.0043389 Eth
$391,483.00
34,145.900 LINK
0.2899%
48
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$11.49
0.0043471 Eth
$382,124.00
33,366.704 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.2833%
49
PointPay
LINK-USDT$11.45
0.0043322 Eth
$373,765.00
32,748.727 LINK
0.2780%
50
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$11.42
0.0043197 Eth
$342,069.00
30,026.251 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.2549%
51
Kraken
LINK-EUR$11.48
0.0043432 Eth
$322,447.00
28,096.337 LINK
0.2385%
52
LATOKEN
LINK-BTC$11.45
0.0043307 Eth
$309,917.00
27,073.736 LINK
0.2298%
53
Pionex
LINK-USDT$11.46
0.0043345 Eth
$303,495.00
26,599.780 LINK
0.2258%
54
Gemini
LINK-USD$11.42
0.0043219 Eth
$284,228.00
24,887.980 LINK
0.2113%
55
Phemex
LINK-USDT$11.46
0.0043359 Eth
$256,638.00
22,397.760 LINK
0.1901%
56
itBit
LINK-USD$11.45
0.0043328 Eth
$235,367.00
20,556.041 LINK
0.1745%
57
ProBit Global
LINK-BTC$11.46
0.0043362 Eth
$232,417.00
20,284.913 LINK
0.1722%
58
Bybit
LINK-USDC$11.47
0.0043423 Eth
$205,005.00
17,948.835 LINK
0.1524%
59
BitMart
LINK-BTC$11.45
0.0043346 Eth
$195,735.00
17,087.740 LINK
0.1451%
60
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$11.51
0.0043543 Eth
$186,050.00
16,330.140 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.1386%
61
BYDFi
LINK-USDC$11.50
0.0043386 Eth
$132,566.00
11,528.390 LINK
0.0979%
62
Hotcoin
LINK-ETH$11.45
0.0043324 Eth
$129,361.00
11,298.880 LINK
0.0959%
63
BitDelta
LINK-USDT$11.44
0.0043309 Eth
$122,544.00
10,747.000 LINK
0.0912%
64
Hotcoin
LINK-BTC$11.44
0.0043307 Eth
$120,603.00
10,538.130 LINK
0.0895%
65
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$11.47
0.0043376 Eth
$120,453.00
119,731.149 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
1.0164%
66
Coinbase Exchange
LINK-ETH$11.46
0.0043343 Eth
$117,883.00
10,289.540 LINK
0.0874%
67
Coinbase Exchange
LINK-BTC$11.47
0.0043395 Eth
$115,377.00
10,062.110 LINK
0.0854%
68
Bitci TR
LINK-TRY$11.40
0.0043144 Eth
$112,890.00
9,889.200 LINK
0.0840%
69
Coinbase Exchange
LINK-GBP$11.47
0.0043411 Eth
$112,476.00
9,804.540 LINK
0.0832%
70
Slex
LINK-BTC$11.44
0.0043310 Eth
$89,863.00
7,852.300 LINK
0.0667%
71
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$11.46
0.0043373 Eth
$61,173.00
5,368.151 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0456%
72
PointPay
LINK-BTC$11.45
0.0043333 Eth
$59,321.00
5,179.579 LINK
0.0440%
73
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$11.43
0.0043254 Eth
$53,152.00
4,600.077 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0391%
74
Slex
LINK-ETH$11.44
0.0043287 Eth
$52,664.00
4,602.280 LINK
0.0391%
75
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$11.43
0.0043233 Eth
$48,590.00
48,356.004 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.4105%
76
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$11.46
0.0043365 Eth
$41,816.00
3,671.925 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0312%
77
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$11.49
0.0043471 Eth
$40,413.00
40,070.409 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.3402%
78
Bitkub
LINK-THB$11.46
0.0043377 Eth
$38,750.00
3,380.880 LINK
0.0287%
79
EXMO
LINK-BTC$11.50
0.0043514 Eth
$33,308.00
2,896.849 LINK
0.0246%
80
Binance US
LINK-USDT$11.47
0.0043383 Eth
$30,106.00
2,625.413 LINK
0.0223%
81
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$11.42
0.0043211 Eth
$28,773.00
2,533.332 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0215%
82
Bitcointry
LINK-USDT$11.45
0.0043328 Eth
$28,401.00
2,501.119 LINK
0.0212%
83
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$11.46
0.0043378 Eth
$28,382.00
2,485.586 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0211%
84
Mercado Bitcoin
LINK-BRL$11.55
0.0043692 Eth
$26,918.00
2,331.297 LINK
0.0198%
85
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$11.44
0.0043297 Eth
$24,311.00
2,133.399 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0181%
86
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$11.42
0.0043236 Eth
$17,249.96
1,514.898 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0129%
87
KuCoin
LINK-KCS$11.47
0.0043393 Eth
$16,072.10
1,401.737 LINK
0.0119%
88
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$11.47
0.0043424 Eth
$15,042.62
1,317.603 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0112%
89
Coinone
LINK-KRW$11.40
0.0043148 Eth
$14,751.43
1,293.829 LINK
0.0110%
90
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$11.50
0.0043491 Eth
$13,611.14
1,191.411 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0101%
91
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X1BFD67037B42CF73ACF2047067BD4F2C47D9BFD6$11.48
0.0043423 Eth
$9,991.43
872.086 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0074%
92
LFJ
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$11.46
0.0043371 Eth
$8,076.12
707.567 0X5947BB275C521040051D82396192181B413227A3
0.0060%
93
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X55D398326F99059FF775485246999027B3197955$11.49
0.0043496 Eth
$7,150.11
620.772 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0053%
94
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$11.42
0.0043212 Eth
$4,547.00
4,531.172 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.0385%
95
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$11.47
0.0043392 Eth
$3,154.73
276.382 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0023%
96
PancakeSwap V3 (Arbitrum)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$11.44
0.0043263 Eth
$2,386.67
209.431 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0018%
97
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$11.49
0.0043487 Eth
$939.81
82.556 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0007%
98
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X61299774020DA444AF134C82FA83E3810B309991$11.49
0.0043478 Eth
$899.52
77.502 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0007%
99
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$11.48
0.0043394 Eth
$254.96
22.407 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0002%
100
CEX.IO
LINK-USDT$11.45
0.0043337 Eth
$145.34
12.754 LINK
0.0001%

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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