ETH Price: $3,471.30 (+0.68%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

727,240 ( 0.015%)

Market

Price

$24.59 @ 0.007084 ETH (-1.60%)

Onchain Market Cap

$24,590,000,000.00

Circulating Supply Market Cap

$15,542,296,343.00

Other Info

Token Contract (WITH 18 Decimals)

Filtered by Token Holder
warrenbucketz.eth
Balance
0.286510767802980602 LINK

Value
$7.05 ( ~0.00203094213170031 Eth) [0.0000%]
0x1bf8118c14c9bf2a9d958d969d139671aea3d08c
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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 22254.55% |ETH 0.0003846 1741.91%

Market

Volume (24H):$1,244,419,447.00
Market Capitalization:$15,542,296,343.00
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$24.52
0.0070532 Eth
$141,234,354.00
5,653,992.680 LINK
23.3511%
2
WhiteBIT
LINK-USDT$24.56
0.0070588 Eth
$46,930,203.00
1,911,137.820 LINK
7.8931%
3
Coinbase Exchange
LINK-USD$24.49
0.0070428 Eth
$39,125,282.00
1,597,732.830 LINK
6.5987%
4
Bybit
LINK-USDT$24.50
0.0070488 Eth
$33,581,045.00
1,342,512.580 LINK
5.5446%
5
P2B
LINK-USDT$24.61
0.0070711 Eth
$29,467,558.00
1,197,490.260 LINK
4.9457%
6
CoinW
LINK-USDT$24.45
0.0070427 Eth
$27,378,447.00
1,119,566.610 LINK
4.6238%
7
Slex
LINK-USDT$24.55
0.0070599 Eth
$25,438,779.00
1,022,526.890 LINK
4.2231%
8
OKX
LINK-USDT$24.45
0.0070349 Eth
$23,125,503.00
925,355.795 LINK
3.8217%
9
DigiFinex
LINK-USDT$24.47
0.0070410 Eth
$17,892,874.00
731,137.900 LINK
3.0196%
10
XT.COM
LINK-USDT$24.49
0.0070461 Eth
$15,178,350.00
606,935.030 LINK
2.5067%
11
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$24.51
0.0070510 Eth
$14,942,370.00
596,432.506 0X514910771AF9CA656AF840DFF83E8264ECF986CA
2.4633%
12
FameEX
LINK-USDT$24.53
0.0070543 Eth
$14,423,431.00
577,342.490 LINK
2.3844%
13
Azbit
LINK-USDT$24.54
0.0070553 Eth
$14,101,301.00
564,755.234 LINK
2.3325%
14
Coinstore
LINK-USDT$24.57
0.0070627 Eth
$12,370,740.00
495,681.320 LINK
2.0472%
15
HTX
LINK-USDT$24.52
0.0070521 Eth
$11,543,499.00
464,092.946 LINK
1.9167%
16
Bitunix
LINK-USDT$24.58
0.0070598 Eth
$11,166,896.00
454,347.220 LINK
1.8765%
17
Binance
LINK-FDUSD$24.51
0.0070529 Eth
$8,770,693.00
350,874.510 LINK
1.4491%
18
BYDFi
LINK-USDT$24.50
0.0070473 Eth
$8,247,307.00
336,572.720 LINK
1.3901%
19
Biconomy.com
LINK-USDT$24.56
0.0070609 Eth
$7,882,076.00
316,282.950 LINK
1.3063%
20
LATOKEN
LINK-USDT$24.52
0.0070531 Eth
$6,704,525.00
273,388.779 LINK
1.1291%
21
Kraken
LINK-USD$24.52
0.0070616 Eth
$6,240,500.00
254,504.559 LINK
1.0511%
22
QMall
LINK-USDT$24.56
0.0070649 Eth
$5,640,541.00
225,722.392 LINK
0.9322%
23
KuCoin
LINK-USDT$24.51
0.0070500 Eth
$5,362,024.00
218,742.178 LINK
0.9034%
24
Dex-Trade
LINK-USDT$24.55
0.0070599 Eth
$4,621,273.00
188,246.930 LINK
0.7775%
25
Coinbase Exchange
LINK-GBP$24.59
0.0070633 Eth
$4,530,904.00
184,292.140 LINK
0.7611%
26
Hotcoin
LINK-USDT$24.54
0.0070570 Eth
$3,612,189.00
147,201.960 LINK
0.6079%
27
Bitvavo
LINK-EUR$24.69
0.0071060 Eth
$3,035,615.00
122,959.934 LINK
0.5078%
28
Dcoin
LINK-USDT$24.60
0.0070708 Eth
$2,751,266.00
111,853.000 LINK
0.4620%
29
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$24.63
0.0070822 Eth
$2,501,217.00
99,372.614 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.4104%
30
EXMO
LINK-USDT$24.53
0.0070548 Eth
$2,269,178.00
92,516.640 LINK
0.3821%
31
CoinEx
LINK-USDT$24.55
0.0070585 Eth
$2,048,359.00
81,987.424 LINK
0.3386%
32
PointPay
LINK-USDT$24.55
0.0070598 Eth
$2,047,910.00
82,188.215 LINK
0.3394%
33
Coinbase Exchange
LINK-EUR$24.69
0.0070990 Eth
$1,747,855.00
70,801.050 LINK
0.2924%
34
WhiteBIT
LINK-BTC$24.53
0.0070551 Eth
$1,614,530.00
65,813.240 LINK
0.2718%
35
WhiteBIT
LINK-TRY$24.68
0.0070981 Eth
$1,606,411.00
65,085.270 LINK
0.2688%
36
Phemex
LINK-USDT$24.47
0.0070373 Eth
$1,472,732.00
60,188.110 LINK
0.2486%
37
Bitstamp
LINK-USD$24.50
0.0070488 Eth
$1,302,531.00
53,164.528 LINK
0.2196%
38
tanX
LINK-USDC$24.57
0.0070656 Eth
$1,239,125.00
49,718.360 LINK
0.2053%
39
Bitstamp
LINK-EUR$24.70
0.0071056 Eth
$1,169,662.00
47,359.925 LINK
0.1956%
40
BitStorage
LINK-USDT$24.56
0.0070627 Eth
$1,123,949.00
45,765.280 LINK
0.1890%
41
EarnBIT
LINK-USDT$24.52
0.0070511 Eth
$1,090,839.00
43,682.058 LINK
0.1804%
42
Bitbank
LINK-JPY$24.60
0.0070754 Eth
$1,018,022.00
41,383.763 LINK
0.1709%
43
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$24.69
0.0070997 Eth
$935,329.00
37,162.864 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1535%
44
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$24.66
0.0070925 Eth
$846,723.00
33,707.364 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.1392%
45
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$24.57
0.0070658 Eth
$744,895.00
30,011.239 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1239%
46
Coinbase Exchange
LINK-ETH$24.57
0.0070684 Eth
$727,397.00
29,599.680 LINK
0.1222%
47
Coinbase Exchange
LINK-USDT$24.66
0.0070910 Eth
$700,538.00
28,410.040 LINK
0.1173%
48
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$24.52
0.0070534 Eth
$661,298.00
26,435.518 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1092%
49
WhiteBIT
LINK-EUR$24.64
0.0070853 Eth
$594,454.00
24,129.800 LINK
0.0997%
50
BigONE
LINK-USDT$24.62
0.0070808 Eth
$580,540.00
23,578.280 LINK
0.0974%
51
HashKey Exchange
LINK-USD$24.61
0.0070675 Eth
$533,320.00
21,365.700 LINK
0.0882%
52
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$24.54
0.0070592 Eth
$519,088.00
37,122.015 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.1533%
53
Gemini
LINK-USD$24.56
0.0070654 Eth
$472,525.00
19,241.506 LINK
0.0795%
54
Slex
LINK-ETH$24.58
0.0070633 Eth
$441,595.00
17,762.920 LINK
0.0734%
55
KuCoin
LINK-USDC$24.52
0.0070515 Eth
$440,761.00
17,976.840 LINK
0.0742%
56
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$24.62
0.0070795 Eth
$437,540.00
17,382.816 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0718%
57
GMO Japan
LINK-JPY$24.62
0.0070801 Eth
$419,538.00
17,041.100 LINK
0.0704%
58
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$24.65
0.0070886 Eth
$414,485.00
16,484.618 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0681%
59
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$24.69
0.0070997 Eth
$392,928.00
397,816.506 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
1.6430%
60
BitMart
LINK-BTC$24.55
0.0070619 Eth
$357,112.00
14,544.720 LINK
0.0601%
61
DeGate
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$24.60
0.0070668 Eth
$338,073.00
13,529.579 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0559%
62
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$24.63
0.0070822 Eth
$329,679.00
335,403.536 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
1.3852%
63
Coinbase Exchange
LINK-BTC$24.54
0.0070586 Eth
$307,570.00
12,531.130 LINK
0.0518%
64
BitDelta
LINK-USDT$24.52
0.0070516 Eth
$305,398.00
12,261.000 LINK
0.0506%
65
LATOKEN
LINK-BTC$24.58
0.0070654 Eth
$233,905.00
9,516.426 LINK
0.0393%
66
Bitkub
LINK-THB$24.69
0.0071008 Eth
$233,152.00
9,442.665 LINK
0.0390%
67
Binance US
LINK-USDT$24.62
0.0070814 Eth
$225,458.00
9,157.313 LINK
0.0378%
68
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$24.58
0.0070677 Eth
$204,375.00
8,170.533 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0337%
69
BitMart
LINK-ETH$24.57
0.0070663 Eth
$192,373.00
7,829.340 LINK
0.0323%
70
BitStorage
LINK-ETH$24.58
0.0070679 Eth
$192,006.00
7,812.450 LINK
0.0323%
71
Uniswap V2 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$24.70
0.0071039 Eth
$190,940.00
7,712.687 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0319%
72
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$24.66
0.0070946 Eth
$176,537.00
7,059.007 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0292%
73
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$24.45
0.0070318 Eth
$172,789.00
6,960.132 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0287%
74
BTCMarkets
LINK-AUD$24.55
0.0070485 Eth
$171,508.00
6,987.111 LINK
0.0289%
75
PointPay
LINK-BTC$24.55
0.0070617 Eth
$142,005.00
5,651.489 LINK
0.0233%
76
Hotcoin
LINK-BTC$24.59
0.0070654 Eth
$124,557.00
5,064.790 LINK
0.0209%
77
Kanga
LINK-PLN$24.68
0.0070966 Eth
$124,338.00
0.000 LINK
0.0000%
78
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$24.61
0.0070781 Eth
$124,177.00
4,930.116 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0204%
79
Kraken
LINK-GBP$24.56
0.0070738 Eth
$124,049.00
5,050.345 LINK
0.0209%
80
Bitso
LINK-USD$24.60
0.0070747 Eth
$100,472.00
4,083.497 LINK
0.0169%
81
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$24.69
0.0070997 Eth
$94,777.00
3,789.899 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0157%
82
KuCoin
LINK-BTC$24.53
0.0070543 Eth
$93,888.00
3,827.790 LINK
0.0158%
83
PancakeSwap (v2)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$24.56
0.0070634 Eth
$76,954.00
3,063.343 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0127%
84
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$24.64
0.0070903 Eth
$58,198.00
2,333.851 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0096%
85
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$24.79
0.0071294 Eth
$58,124.00
2,282.883 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0094%
86
Bitexen
LINK-TRY$24.47
0.0070311 Eth
$57,646.00
2,355.646 LINK
0.0097%
87
Nonkyc.io
LINK-BTC$24.62
0.0070816 Eth
$47,811.00
1,904.305 LINK
0.0079%
88
Mercado Bitcoin
LINK-BRL$24.41
0.0070197 Eth
$47,771.00
1,957.344 LINK
0.0081%
89
THENA FUSION
0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$24.63
0.0070860 Eth
$46,435.00
61.771 0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827
0.0003%
90
Hotcoin
LINK-ETH$24.56
0.0070629 Eth
$42,638.00
1,736.210 LINK
0.0072%
91
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$24.56
0.0070653 Eth
$38,378.00
2,741.980 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.0113%
92
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XDAC17F958D2EE523A2206206994597C13D831EC7$24.67
0.0070989 Eth
$35,653.00
1,439.470 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0059%
93
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XD6DF932A45C0F255F85145F286EA0B292B21C90B$24.69
0.0070995 Eth
$34,772.00
1,414.749 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0058%
94
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$24.60
0.0070724 Eth
$22,121.00
879.646 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0036%
95
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X1BFD67037B42CF73ACF2047067BD4F2C47D9BFD6$24.60
0.0070741 Eth
$18,907.62
748.033 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0031%
96
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$24.70
0.0071013 Eth
$18,418.90
729.634 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0030%
97
Gemini
LINK-BTC$24.56
0.0070670 Eth
$18,266.16
743.640 LINK
0.0031%
98
Uniswap V3 (Avalanche)
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$24.50
0.0070489 Eth
$16,257.68
660.684 0X5947BB275C521040051D82396192181B413227A3
0.0027%
99
KuCoin
LINK-KCS$24.76
0.0071214 Eth
$9,495.39
383.474 LINK
0.0016%
100
Ace
LINK-USDT$24.56
0.0070634 Eth
$5,511.60
220.830 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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