ETH Price: $3,459.39 (-0.79%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

727,264 ( 0.021%)

Market

Price

$24.23 @ 0.007004 ETH (-5.39%)

Onchain Market Cap

$24,230,000,000.00

Circulating Supply Market Cap

$15,283,552,429.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
1,000.710857959204258274 LINK

Value
$24,247.22 ( ~7.0091 Eth) [0.0001%]
0x57e1D1Db7147843c67E726463c8907D7A105B0f6
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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 21927.27% |ETH 0.0003846 1721.11%

Market

Volume (24H):$1,150,811,626.00
Market Capitalization:$15,283,552,429.00
Circulating Supply:631,099,972.00 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$24.27
0.0070292 Eth
$131,539,133.00
5,274,834.650 LINK
23.6140%
2
WhiteBIT
LINK-USDT$24.26
0.0070235 Eth
$41,940,131.00
1,729,126.130 LINK
7.7408%
3
Coinbase Exchange
LINK-USD$24.31
0.0070405 Eth
$32,988,962.00
1,357,012.000 LINK
6.0750%
4
Bybit
LINK-USDT$24.32
0.0070422 Eth
$31,311,826.00
1,255,966.787 LINK
5.6226%
5
P2B
LINK-USDT$24.30
0.0070393 Eth
$26,827,696.00
1,103,897.660 LINK
4.9419%
6
CoinW
LINK-USDT$24.26
0.0070262 Eth
$26,550,565.00
1,094,214.640 LINK
4.8985%
7
OKX
LINK-USDT$24.32
0.0070426 Eth
$21,665,587.00
868,698.518 LINK
3.8889%
8
DigiFinex
LINK-USDT$24.32
0.0070424 Eth
$16,547,299.00
680,494.990 LINK
3.0464%
9
XT.COM
LINK-USDT$24.26
0.0070250 Eth
$13,991,503.00
560,508.060 LINK
2.5092%
10
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$24.28
0.0070301 Eth
$13,766,810.00
554,752.657 0X514910771AF9CA656AF840DFF83E8264ECF986CA
2.4835%
11
Azbit
LINK-USDT$24.12
0.0069897 Eth
$13,458,892.00
539,796.514 LINK
2.4165%
12
FameEX
LINK-USDT$24.25
0.0070266 Eth
$13,114,775.00
525,989.311 LINK
2.3547%
13
Coinstore
LINK-USDT$24.26
0.0070296 Eth
$11,659,878.00
468,364.440 LINK
2.0967%
14
HTX
LINK-USDT$24.34
0.0070511 Eth
$11,463,298.00
461,504.808 LINK
2.0660%
15
Bitunix
LINK-USDT$24.24
0.0070229 Eth
$10,243,494.00
422,680.850 LINK
1.8922%
16
Binance
LINK-FDUSD$24.24
0.0070206 Eth
$8,581,451.00
344,720.600 LINK
1.5432%
17
Biconomy.com
LINK-USDT$24.23
0.0070134 Eth
$7,714,476.00
309,901.220 LINK
1.3873%
18
BYDFi
LINK-USDT$24.32
0.0070437 Eth
$7,678,672.00
315,725.020 LINK
1.4134%
19
LATOKEN
LINK-USDT$24.27
0.0070171 Eth
$6,425,815.00
264,796.991 LINK
1.1854%
20
Kraken
LINK-USD$24.28
0.0070297 Eth
$5,740,646.00
236,477.138 LINK
1.0586%
21
QMall
LINK-USDT$24.18
0.0070089 Eth
$5,151,600.00
206,800.128 LINK
0.9258%
22
KuCoin
LINK-USDT$24.33
0.0070441 Eth
$5,021,116.00
206,413.834 LINK
0.9241%
23
Dex-Trade
LINK-USDT$24.26
0.0070267 Eth
$4,270,493.00
176,007.890 LINK
0.7879%
24
Coinbase Exchange
LINK-GBP$24.26
0.0070255 Eth
$3,928,646.00
161,925.480 LINK
0.7249%
25
Hotcoin
LINK-USDT$24.27
0.0070334 Eth
$3,586,551.00
147,793.200 LINK
0.6616%
26
Bitvavo
LINK-EUR$24.27
0.0070275 Eth
$2,867,971.00
118,167.825 LINK
0.5290%
27
Dcoin
LINK-USDT$24.19
0.0070115 Eth
$2,679,778.00
110,770.000 LINK
0.4959%
28
EXMO
LINK-USDT$24.32
0.0070495 Eth
$2,128,589.00
87,509.479 LINK
0.3918%
29
PointPay
LINK-USDT$24.20
0.0070151 Eth
$2,092,606.00
84,008.110 LINK
0.3761%
30
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$24.35
0.0070542 Eth
$2,056,854.00
82,547.704 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.3695%
31
CoinEx
LINK-USDT$24.22
0.0070129 Eth
$1,718,262.00
68,920.323 LINK
0.3085%
32
WhiteBIT
LINK-TRY$24.42
0.0070762 Eth
$1,466,705.00
60,070.910 LINK
0.2689%
33
Coinbase Exchange
LINK-EUR$24.29
0.0070366 Eth
$1,450,237.00
59,715.090 LINK
0.2673%
34
WhiteBIT
LINK-BTC$24.29
0.0070327 Eth
$1,389,791.00
57,224.380 LINK
0.2562%
35
Phemex
LINK-USDT$24.32
0.0070437 Eth
$1,352,271.00
55,601.500 LINK
0.2489%
36
tanX
LINK-USDC$24.34
0.0070508 Eth
$1,238,178.00
49,775.420 LINK
0.2228%
37
Bitstamp
LINK-USD$24.32
0.0070434 Eth
$1,172,742.00
48,221.284 LINK
0.2159%
38
BitStorage
LINK-USDT$24.24
0.0070209 Eth
$1,027,888.00
42,399.190 LINK
0.1898%
39
Bitbank
LINK-JPY$24.33
0.0070498 Eth
$996,498.00
40,956.114 LINK
0.1833%
40
EarnBIT
LINK-USDT$24.23
0.0070209 Eth
$989,591.00
39,752.471 LINK
0.1780%
41
Bitstamp
LINK-EUR$24.31
0.0070413 Eth
$960,153.00
39,492.122 LINK
0.1768%
42
Binance
LINK-TRY$24.29
0.0070402 Eth
$852,533.00
33,941.160 LINK
0.1519%
43
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$24.19
0.0070102 Eth
$772,418.00
31,319.796 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.1402%
44
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$24.20
0.0070145 Eth
$769,841.00
31,084.753 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1392%
45
Coinbase Exchange
LINK-ETH$24.19
0.0070044 Eth
$712,616.00
29,461.360 LINK
0.1319%
46
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$24.29
0.0070334 Eth
$680,105.00
696,244.571 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
3.1169%
47
Azbit
LINK-ETH$24.21
0.0070103 Eth
$650,733.00
26,430.381 LINK
0.1183%
48
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$24.25
0.0070292 Eth
$632,448.00
25,795.179 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1155%
49
Bybit
LINK-USDC$24.34
0.0070478 Eth
$617,453.00
24,792.215 LINK
0.1110%
50
BigONE
LINK-USDT$24.30
0.0070356 Eth
$576,948.00
23,745.770 LINK
0.1063%
51
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$24.23
0.0070166 Eth
$575,586.00
23,172.503 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1037%
52
WhiteBIT
LINK-EUR$24.31
0.0070404 Eth
$521,124.00
21,437.130 LINK
0.0960%
53
Coinbase Exchange
LINK-USDT$24.21
0.0070110 Eth
$519,545.00
21,458.292 LINK
0.0961%
54
HashKey Exchange
LINK-USD$24.41
0.0070410 Eth
$514,877.00
20,634.550 LINK
0.0924%
55
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$24.28
0.0070301 Eth
$440,626.00
31,898.999 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.1428%
56
Slex
LINK-ETH$24.27
0.0070296 Eth
$438,365.00
17,770.300 LINK
0.0796%
57
Gemini
LINK-USD$24.32
0.0070426 Eth
$435,572.00
17,912.127 LINK
0.0802%
58
GMO Japan
LINK-JPY$24.25
0.0070255 Eth
$416,536.00
17,173.200 LINK
0.0769%
59
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$24.35
0.0070542 Eth
$383,143.00
15,347.949 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0687%
60
KuCoin
LINK-USDC$24.29
0.0070350 Eth
$366,860.00
15,100.857 LINK
0.0676%
61
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$24.28
0.0070367 Eth
$360,092.00
369,532.731 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
1.6543%
62
BitMart
LINK-BTC$24.25
0.0070287 Eth
$348,606.00
14,373.940 LINK
0.0643%
63
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$24.41
0.0070714 Eth
$339,650.00
13,643.300 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0611%
64
itBit
LINK-USD$24.27
0.0070278 Eth
$335,730.00
13,833.147 LINK
0.0619%
65
DeGate
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$24.25
0.0070204 Eth
$323,906.00
13,009.985 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0582%
66
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$24.35
0.0070542 Eth
$319,244.00
328,270.060 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
1.4696%
67
BitDelta
LINK-USDT$24.32
0.0070437 Eth
$292,387.00
11,749.000 LINK
0.0526%
68
Coinbase Exchange
LINK-BTC$24.28
0.0070361 Eth
$280,224.00
11,542.980 LINK
0.0517%
69
Bitci TR
LINK-TRY$24.25
0.0070226 Eth
$250,763.00
10,054.580 LINK
0.0450%
70
Bitkub
LINK-THB$24.26
0.0070256 Eth
$228,663.00
9,424.544 LINK
0.0422%
71
LATOKEN
LINK-BTC$24.23
0.0070152 Eth
$218,067.00
9,001.148 LINK
0.0403%
72
BitStorage
LINK-ETH$24.30
0.0070174 Eth
$193,077.00
7,946.210 LINK
0.0356%
73
BitMart
LINK-ETH$24.24
0.0070259 Eth
$184,163.00
7,596.620 LINK
0.0340%
74
Binance US
LINK-USDT$24.24
0.0070242 Eth
$182,656.00
7,534.521 LINK
0.0337%
75
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$24.29
0.0070410 Eth
$179,577.00
7,248.348 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0324%
76
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$24.24
0.0070183 Eth
$160,654.00
6,444.636 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0289%
77
PointPay
LINK-BTC$24.25
0.0070273 Eth
$149,755.00
6,009.619 LINK
0.0269%
78
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$24.22
0.0070182 Eth
$140,490.00
5,735.176 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0257%
79
BTCMarkets
LINK-AUD$24.37
0.0070571 Eth
$135,128.00
5,544.585 LINK
0.0248%
80
Hotcoin
LINK-BTC$24.30
0.0070352 Eth
$123,143.00
5,068.560 LINK
0.0227%
81
Kraken
LINK-GBP$24.17
0.0069994 Eth
$117,984.00
4,881.235 LINK
0.0219%
82
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$24.33
0.0070467 Eth
$98,370.00
3,948.276 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0177%
83
Bitso
LINK-USD$24.23
0.0070187 Eth
$97,219.00
4,012.106 LINK
0.0180%
84
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$24.14
0.0069965 Eth
$87,365.00
3,506.682 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0157%
85
PancakeSwap (v2)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$24.19
0.0070107 Eth
$69,077.00
2,795.308 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0125%
86
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$24.24
0.0070199 Eth
$58,389.00
2,364.980 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0106%
87
Bitexen
LINK-TRY$24.07
0.0069648 Eth
$56,701.00
2,355.646 LINK
0.0105%
88
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$24.42
0.0070751 Eth
$53,417.00
2,117.093 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0095%
89
Hotcoin
LINK-ETH$24.26
0.0070262 Eth
$42,403.00
1,747.600 LINK
0.0078%
90
THENA FUSION
0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$24.20
0.0070075 Eth
$40,071.00
54.082 0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827
0.0002%
91
Bitstamp
LINK-BTC$24.60
0.0071249 Eth
$35,482.00
1,442.296 LINK
0.0065%
92
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XDAC17F958D2EE523A2206206994597C13D831EC7$24.32
0.0070437 Eth
$33,934.00
1,374.901 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0062%
93
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XD6DF932A45C0F255F85145F286EA0B292B21C90B$24.51
0.0071037 Eth
$31,326.00
1,285.358 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0058%
94
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$24.22
0.0070121 Eth
$20,377.00
819.380 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0037%
95
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X1BFD67037B42CF73ACF2047067BD4F2C47D9BFD6$24.18
0.0070079 Eth
$17,506.00
699.945 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0031%
96
Binance US
LINK-BTC$24.22
0.0070136 Eth
$16,448.64
679.194 LINK
0.0030%
97
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$24.46
0.0070815 Eth
$13,553.50
542.364 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0024%
98
Uniswap V3 (Avalanche)
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$24.25
0.0070227 Eth
$13,246.91
545.773 0X5947BB275C521040051D82396192181B413227A3
0.0024%
99
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$24.15
0.0069970 Eth
$13,180.35
532.267 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0024%
100
Ace
LINK-USDT$24.27
0.0070332 Eth
$5,132.25
205.960 LINK
0.0009%

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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