ETH Price: $2,647.97 (+0.31%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

722,337 ( -0.002%)

Market

Price

$12.31 @ 0.004649 ETH (+2.61%)

Onchain Market Cap

$12,310,000,000.00

Circulating Supply Market Cap

$7,724,328,538.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
137.63731318 LINK

Value
$1,694.32 ( ~0.639857294193775 Eth) [0.0000%]
0x394c54e6fb0da559dc79a4608cd0bae88e7f47b3
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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 11090.91% |ETH 0.0003846 1108.79%

Market

Volume (24H):$492,520,203.00
Market Capitalization:$7,724,328,538.00
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$12.31
0.0046412 Eth
$37,332,371.00
3,069,742.230 LINK
15.7591%
2
WhiteBIT
LINK-USDT$12.32
0.0046474 Eth
$29,648,344.00
2,407,005.180 LINK
12.3568%
3
Coinbase Exchange
LINK-USD$12.33
0.0046543 Eth
$18,868,105.00
1,530,880.740 LINK
7.8591%
4
HTX
LINK-USDT$12.32
0.0046515 Eth
$13,393,406.00
1,100,701.485 LINK
5.6507%
5
Bybit
LINK-USDT$12.33
0.0046547 Eth
$11,595,557.00
955,236.756 LINK
4.9039%
6
Bitget
LINK-USDT$12.33
0.0046565 Eth
$10,258,868.00
843,054.776 LINK
4.3280%
7
OKX
LINK-USDT$12.33
0.0046550 Eth
$8,100,432.00
667,543.459 LINK
3.4270%
8
BTSE
LINK-USDT$12.33
0.0046521 Eth
$7,994,318.00
648,462.076 LINK
3.3290%
9
Upbit
LINK-KRW$12.40
0.0046847 Eth
$7,704,928.00
621,162.628 LINK
3.1889%
10
P2B
LINK-USDT$12.32
0.0046537 Eth
$7,527,159.00
610,797.610 LINK
3.1356%
11
Slex
LINK-USDT$12.31
0.0046445 Eth
$6,557,700.00
539,239.230 LINK
2.7683%
12
Gate.io
LINK-USDT$12.32
0.0046538 Eth
$6,455,824.00
529,734.050 LINK
2.7195%
13
Azbit
LINK-USDT$12.32
0.0046524 Eth
$5,489,768.00
451,313.860 LINK
2.3169%
14
DigiFinex
LINK-USDT$12.32
0.0046534 Eth
$5,164,551.00
419,109.310 LINK
2.1516%
15
Biconomy.com
LINK-USDT$12.33
0.0046525 Eth
$4,173,516.00
343,365.510 LINK
1.7627%
16
XT.COM
LINK-USDT$12.33
0.0046521 Eth
$3,710,120.00
304,969.410 LINK
1.5656%
17
Bitunix
LINK-USDT$12.29
0.0046410 Eth
$3,685,433.00
299,834.060 LINK
1.5393%
18
CoinW
LINK-USDT$12.29
0.0046411 Eth
$3,641,068.00
296,249.750 LINK
1.5209%
19
Hotcoin
LINK-USDT$12.34
0.0046558 Eth
$3,278,956.00
265,788.070 LINK
1.3645%
20
Coinstore
LINK-USDT$12.30
0.0046453 Eth
$2,671,170.00
219,523.220 LINK
1.1270%
21
Binance
LINK-FDUSD$12.31
0.0046476 Eth
$2,443,073.00
200,802.410 LINK
1.0309%
22
LBank
LINK-USDT$12.30
0.0046462 Eth
$2,232,590.00
181,450.740 LINK
0.9315%
23
KuCoin
LINK-USDT$12.32
0.0046513 Eth
$2,088,635.00
169,570.640 LINK
0.8705%
24
BYDFi
LINK-USDT$12.31
0.0046500 Eth
$1,856,943.00
150,823.020 LINK
0.7743%
25
ProBit Global
LINK-USDT$12.30
0.0046431 Eth
$1,589,129.00
129,238.751 LINK
0.6635%
26
WhiteBIT
LINK-BTC$12.30
0.0046401 Eth
$1,566,026.00
127,357.900 LINK
0.6538%
27
Trubit
LINK-USDT$12.32
0.0046509 Eth
$1,529,827.00
125,396.300 LINK
0.6437%
28
FameEX
LINK-USDT$12.31
0.0046459 Eth
$1,485,212.00
122,122.367 LINK
0.6269%
29
Bitvavo
LINK-EUR$12.33
0.0046512 Eth
$1,397,867.00
113,410.999 LINK
0.5822%
30
AscendEX (BitMax)
LINK-USDT$12.33
0.0046586 Eth
$1,299,596.00
105,360.500 LINK
0.5409%
31
Dex-Trade
LINK-USDT$12.32
0.0046450 Eth
$1,264,582.00
102,673.950 LINK
0.5271%
32
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$12.24
0.0046220 Eth
$1,143,476.00
94,946.357 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.4874%
33
CoinEx
LINK-USDT$12.32
0.0046483 Eth
$1,034,634.00
84,946.968 LINK
0.4361%
34
HashKey Global
LINK-USDT$12.34
0.0046585 Eth
$1,002,913.00
81,788.041 LINK
0.4199%
35
Azbit
LINK-ETH$12.31
0.0046458 Eth
$988,382.00
81,891.100 LINK
0.4204%
36
Kraken
LINK-XBT$12.31
0.0046496 Eth
$745,962.00
60,587.592 LINK
0.3110%
37
LATOKEN
LINK-USDT$12.30
0.0046429 Eth
$690,162.00
56,130.963 LINK
0.2882%
38
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$12.29
0.0046434 Eth
$675,591.00
55,865.652 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.2868%
39
itBit
LINK-USD$12.32
0.0046524 Eth
$632,006.00
51,299.182 LINK
0.2634%
40
PointPay
LINK-USDT$12.32
0.0046496 Eth
$611,920.00
50,290.251 LINK
0.2582%
41
AscendEX (BitMax)
LINK-BTC$12.27
0.0046346 Eth
$606,953.00
49,460.800 LINK
0.2539%
42
LATOKEN
LINK-BTC$12.30
0.0046431 Eth
$585,295.00
47,581.424 LINK
0.2443%
43
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$12.32
0.0046513 Eth
$538,593.00
44,640.849 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.2292%
44
ProBit Global
LINK-BTC$12.32
0.0046521 Eth
$533,379.00
43,301.979 LINK
0.2223%
45
tanX
LINK-USDC$12.33
0.0046489 Eth
$509,681.00
41,917.980 LINK
0.2152%
46
BigONE
LINK-USDT$12.30
0.0046405 Eth
$505,278.00
41,094.200 LINK
0.2110%
47
EXMO
LINK-USDT$12.33
0.0046545 Eth
$501,661.00
40,700.449 LINK
0.2089%
48
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$12.30
0.0046448 Eth
$489,843.00
40,726.936 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.2091%
49
Bybit
LINK-USDC$12.32
0.0046517 Eth
$426,668.00
34,953.695 LINK
0.1794%
50
Phemex
LINK-USDT$12.33
0.0046521 Eth
$401,874.00
32,597.830 LINK
0.1673%
51
EarnBIT
LINK-USDT$12.33
0.0046515 Eth
$376,861.00
31,045.209 LINK
0.1594%
52
WhiteBIT
LINK-EUR$12.31
0.0046470 Eth
$334,580.00
27,186.600 LINK
0.1396%
53
Coinbase Exchange
LINK-BTC$12.40
0.0046816 Eth
$314,173.00
25,345.280 LINK
0.1301%
54
Binance
LINK-TRY$12.33
0.0046536 Eth
$305,834.00
25,085.580 LINK
0.1288%
55
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$12.33
0.0046549 Eth
$289,983.00
23,985.562 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1231%
56
WhiteBIT
LINK-TRY$12.32
0.0046522 Eth
$284,818.00
23,117.260 LINK
0.1187%
57
Coinbase Exchange
LINK-USDT$12.39
0.0046761 Eth
$278,815.00
22,511.981 LINK
0.1156%
58
Gemini
LINK-USD$12.35
0.0046639 Eth
$266,025.00
21,540.464 LINK
0.1106%
59
Bitbank
LINK-JPY$12.31
0.0046490 Eth
$224,703.00
18,254.513 LINK
0.0937%
60
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$12.31
0.0046494 Eth
$224,216.00
18,558.822 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0953%
61
BitMart
LINK-BTC$12.30
0.0046413 Eth
$206,755.00
16,812.680 LINK
0.0863%
62
Bitso
LINK-USD$12.31
0.0046406 Eth
$191,189.00
15,529.204 LINK
0.0797%
63
Coinbase Exchange
LINK-GBP$12.30
0.0046430 Eth
$180,731.00
14,692.970 LINK
0.0754%
64
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$12.31
0.0046478 Eth
$179,642.00
14,742.727 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0757%
65
OKX
LINK-USDC$12.31
0.0046490 Eth
$173,474.00
14,248.412 LINK
0.0731%
66
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$12.30
0.0046439 Eth
$169,849.00
168,085.637 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.8629%
67
Slex
LINK-BTC$12.32
0.0046488 Eth
$167,025.00
13,643.700 LINK
0.0700%
68
BitDelta
LINK-USDT$12.31
0.0046447 Eth
$161,896.00
13,306.000 LINK
0.0683%
69
BYDFi
LINK-USDC$12.34
0.0046568 Eth
$147,309.00
11,942.270 LINK
0.0613%
70
Bitci TR
LINK-TRY$12.27
0.0046312 Eth
$126,339.00
10,356.432 LINK
0.0532%
71
PointPay
LINK-BTC$12.32
0.0046426 Eth
$111,415.00
9,100.527 LINK
0.0467%
72
GMO Japan
LINK-JPY$12.30
0.0046457 Eth
$110,240.00
8,960.900 LINK
0.0460%
73
Mercado Bitcoin
LINK-BRL$12.39
0.0046755 Eth
$93,620.00
7,556.895 LINK
0.0388%
74
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$12.24
0.0046210 Eth
$88,804.00
87,948.124 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.4515%
75
Coinbase Exchange
LINK-ETH$12.31
0.0046488 Eth
$81,120.00
6,589.160 LINK
0.0338%
76
PancakeSwap (v2)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$12.30
0.0046452 Eth
$72,252.00
5,996.548 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0308%
77
Bitkub
LINK-THB$12.31
0.0046487 Eth
$70,904.00
5,758.455 LINK
0.0296%
78
BitStorage
LINK-ETH$12.32
0.0046528 Eth
$66,718.00
5,415.090 LINK
0.0278%
79
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$12.30
0.0046439 Eth
$66,180.00
5,430.729 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0279%
80
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$12.28
0.0046373 Eth
$58,813.00
4,856.016 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0249%
81
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$12.32
0.0046505 Eth
$54,261.00
4,445.003 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0228%
82
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$12.30
0.0046465 Eth
$53,676.00
4,478.923 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0230%
83
KuCoin
LINK-KCS$12.31
0.0046488 Eth
$40,804.00
3,314.590 LINK
0.0170%
84
Bitcointry
LINK-USDT$12.32
0.0046488 Eth
$39,249.00
3,247.951 LINK
0.0167%
85
Binance US
LINK-USDT$12.32
0.0046481 Eth
$37,377.00
3,034.391 LINK
0.0156%
86
EXMO
LINK-BTC$12.32
0.0046511 Eth
$35,867.00
2,910.836 LINK
0.0149%
87
PancakeSwap V3 (BSC)
0X0E09FABB73BD3ADE0A17ECC321FD13A19E81CE82-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$12.30
0.0046448 Eth
$35,654.00
19,328.172 0X0E09FABB73BD3ADE0A17ECC321FD13A19E81CE82
0.0992%
88
Nonkyc.io
LINK-BTC$12.27
0.0046324 Eth
$34,813.00
2,865.813 LINK
0.0147%
89
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$12.32
0.0046513 Eth
$32,848.00
32,475.691 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.1667%
90
THENA FUSION
0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$12.34
0.0046591 Eth
$31,578.00
47.714 0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827
0.0002%
91
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$12.31
0.0046501 Eth
$29,918.00
2,477.883 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0127%
92
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XD93F7E271CB87C23AAA73EDC008A79646D1F9912$12.31
0.0046481 Eth
$29,353.00
2,464.401 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0127%
93
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$12.33
0.0046586 Eth
$27,924.00
2,300.138 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0118%
94
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$12.33
0.0046526 Eth
$25,675.00
2,134.050 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0110%
95
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$12.24
0.0046220 Eth
$18,722.96
18,684.700 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.0959%
96
CoinEx
LINK-BTC$12.28
0.0046359 Eth
$16,926.53
1,387.675 LINK
0.0071%
97
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X1BFD67037B42CF73ACF2047067BD4F2C47D9BFD6$12.37
0.0046731 Eth
$15,138.87
1,237.905 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0064%
98
PancakeSwap V3 (BSC)
0X0E09FABB73BD3ADE0A17ECC321FD13A19E81CE82-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$12.30
0.0046448 Eth
$11,830.96
6,425.113 0X0E09FABB73BD3ADE0A17ECC321FD13A19E81CE82
0.0330%
99
Pangolin
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$12.27
0.0046333 Eth
$11,570.76
961.944 0X5947BB275C521040051D82396192181B413227A3
0.0049%
100
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$12.30
0.0046446 Eth
$8,849.82
727.057 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0037%

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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