ETH Price: $3,239.05 (-1.46%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

725,727 ( -0.001%)

Market

Price

$19.63 @ 0.006060 ETH (-4.09%)

Onchain Market Cap

$19,630,000,000.00

Circulating Supply Market Cap

$12,388,666,736.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
23.7608 LINK

Value
$466.42 ( ~0.143998824010778 Eth) [0.0000%]
0xaaab2114af25b2ecafb7345bcd68d62e9071a968
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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 17745.45% |ETH 0.0003846 1475.66%

Market

Volume (24H):$459,275,342.00
Market Capitalization:$12,388,666,736.00
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
Websea
LINK-USDT$19.70
0.0060540 Eth
$49,513,456.00
0.000 LINK
0.0000%
2
Binance
LINK-USDT$19.75
0.0060520 Eth
$48,858,636.00
2,434,283.240 LINK
20.1509%
3
Coinbase Exchange
LINK-USD$19.63
0.0060683 Eth
$15,369,779.00
783,053.740 LINK
6.4821%
4
WEEX
LINK-USDT$19.62
0.0060634 Eth
$10,531,322.00
525,255.660 LINK
4.3480%
5
P2B
LINK-USDT$19.62
0.0060666 Eth
$9,917,121.00
505,409.770 LINK
4.1838%
6
Slex
LINK-USDT$19.64
0.0060669 Eth
$8,313,445.00
414,146.990 LINK
3.4283%
7
Bitget
LINK-USDT$19.62
0.0060666 Eth
$7,925,854.00
395,277.828 LINK
3.2721%
8
BVOX
LINK-USDT$19.61
0.0060470 Eth
$7,690,575.00
383,239.510 LINK
3.1724%
9
Ourbit
LINK-USDT$19.60
0.0060598 Eth
$7,101,324.00
354,184.430 LINK
2.9319%
10
Bybit
LINK-USDT$19.62
0.0060662 Eth
$6,817,757.00
340,038.571 LINK
2.8148%
11
MEXC
LINK-USDT$19.81
0.0060695 Eth
$6,771,244.00
341,727.490 LINK
2.8288%
12
DigiFinex
LINK-USDT$19.60
0.0060610 Eth
$5,806,168.00
296,174.860 LINK
2.4517%
13
XT.COM
LINK-USDT$19.62
0.0060534 Eth
$4,918,705.00
245,306.340 LINK
2.0306%
14
Deepcoin
LINK-USDT$19.60
0.0060602 Eth
$4,891,527.00
269,935.831 LINK
2.2345%
15
Azbit
LINK-USDT$19.59
0.0060569 Eth
$4,888,352.00
243,698.868 LINK
2.0173%
16
FameEX
LINK-USDT$19.59
0.0060561 Eth
$4,884,359.00
243,526.552 LINK
2.0159%
17
HTX
LINK-USDT$19.65
0.0060698 Eth
$4,804,751.00
239,520.527 LINK
1.9827%
18
OKX
LINK-USDT$19.61
0.0060592 Eth
$4,768,327.00
237,540.064 LINK
1.9663%
19
Coinstore
LINK-USDT$19.59
0.0060563 Eth
$4,505,388.00
224,724.220 LINK
1.8603%
20
Niza Global
LINK-USD$19.60
0.0060521 Eth
$4,420,662.00
220,706.831 LINK
1.8270%
21
Binance
LINK-FDUSD$19.41
0.0059991 Eth
$4,328,198.00
217,828.500 LINK
1.8032%
22
Kraken
LINK-USD$19.60
0.0060550 Eth
$4,325,986.00
220,706.831 LINK
1.8270%
23
CoinW
LINK-USDT$19.64
0.0060662 Eth
$3,861,232.00
196,632.560 LINK
1.6277%
24
Gate.io
LINK-USDT$19.63
0.0060627 Eth
$3,805,420.00
189,793.340 LINK
1.5711%
25
Bitunix
LINK-USDT$19.59
0.0060560 Eth
$3,436,341.00
175,359.050 LINK
1.4516%
26
Toobit
LINK-USDT$19.63
0.0060660 Eth
$3,147,733.00
156,989.110 LINK
1.2995%
27
BYDFi
LINK-USDT$19.64
0.0060458 Eth
$2,696,774.00
137,306.250 LINK
1.1366%
28
KuCoin
LINK-USDT$19.63
0.0060654 Eth
$2,421,223.00
123,316.045 LINK
1.0208%
29
LATOKEN
LINK-USDT$19.63
0.0060665 Eth
$2,377,652.00
121,121.557 LINK
1.0026%
30
LBank
LINK-USDT$19.59
0.0060571 Eth
$2,319,419.00
118,387.460 LINK
0.9800%
31
Binance
LINK-USDC$19.80
0.0060639 Eth
$2,281,243.00
113,503.990 LINK
0.9396%
32
QMall
LINK-USDT$19.62
0.0060633 Eth
$1,987,549.00
99,188.455 LINK
0.8211%
33
Binance
LINK-BTC$19.80
0.0060631 Eth
$1,928,804.00
96,047.940 LINK
0.7951%
34
BTSE
LINK-USDT$19.61
0.0060541 Eth
$1,626,675.00
82,965.429 LINK
0.6868%
35
Dex-Trade
LINK-USDT$19.81
0.0060657 Eth
$1,528,376.00
77,148.000 LINK
0.6386%
36
Biconomy.com
LINK-USDT$19.79
0.0060637 Eth
$1,363,750.00
67,899.920 LINK
0.5621%
37
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$19.65
0.0060754 Eth
$1,148,436.00
57,735.062 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.4779%
38
CoinEx
LINK-USDT$19.60
0.0060604 Eth
$925,700.00
46,260.782 LINK
0.3829%
39
Coinbase Exchange
LINK-ETH$19.62
0.0060596 Eth
$879,003.00
44,811.870 LINK
0.3710%
40
tanX
LINK-USDC$19.63
0.0060679 Eth
$844,739.00
42,100.070 LINK
0.3485%
41
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$19.63
0.0060659 Eth
$811,375.00
40,478.327 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.3351%
42
Coinbase Exchange
LINK-EUR$19.64
0.0060657 Eth
$790,931.00
40,281.090 LINK
0.3334%
43
Bitvavo
LINK-EUR$19.61
0.0060614 Eth
$784,759.00
40,016.841 LINK
0.3313%
44
PointPay
LINK-USDT$19.59
0.0060548 Eth
$765,095.00
38,171.782 LINK
0.3160%
45
Pionex
LINK-USDT$19.62
0.0060622 Eth
$613,912.00
30,594.790 LINK
0.2533%
46
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$19.63
0.0060508 Eth
$518,321.00
26,090.498 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.2160%
47
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$19.59
0.0060569 Eth
$516,442.00
26,021.538 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.2154%
48
FMFW.io
LINK-USDT$19.62
0.0060648 Eth
$499,131.00
25,437.360 LINK
0.2106%
49
EXMO
LINK-USDT$19.60
0.0060585 Eth
$403,411.00
20,586.127 LINK
0.1704%
50
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$19.66
0.0060704 Eth
$355,263.00
18,128.637 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1501%
51
Bitbank
LINK-JPY$19.65
0.0060710 Eth
$338,333.00
17,222.340 LINK
0.1426%
52
Coinbase Exchange
LINK-GBP$19.62
0.0060602 Eth
$335,501.00
17,102.030 LINK
0.1416%
53
BigONE
LINK-USDT$19.68
0.0060778 Eth
$292,093.00
14,839.530 LINK
0.1228%
54
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$19.60
0.0060603 Eth
$290,542.00
297,121.309 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
2.4596%
55
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$19.60
0.0060592 Eth
$277,701.00
20,733.898 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.1716%
56
BitMart
LINK-BTC$19.63
0.0060667 Eth
$263,845.00
13,444.020 LINK
0.1113%
57
Gemini
LINK-USD$19.62
0.0060658 Eth
$242,449.00
12,357.615 LINK
0.1023%
58
Coinbase Exchange
LINK-BTC$19.62
0.0060623 Eth
$205,824.00
10,491.600 LINK
0.0868%
59
Bitci TR
LINK-TRY$19.60
0.0060565 Eth
$200,411.00
9,962.230 LINK
0.0825%
60
QMall
LINK-USDC$19.63
0.0060660 Eth
$190,618.00
9,507.214 LINK
0.0787%
61
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$19.71
0.0060863 Eth
$184,557.00
9,245.868 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0765%
62
GMO Japan
LINK-JPY$19.80
0.0061186 Eth
$178,849.00
9,033.300 LINK
0.0748%
63
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$19.71
0.0060863 Eth
$154,477.00
157,330.661 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
1.3024%
64
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$19.63
0.0060514 Eth
$132,479.00
6,642.215 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0550%
65
BitStorage
LINK-ETH$19.62
0.0060597 Eth
$127,849.00
6,514.680 LINK
0.0539%
66
OKX
LINK-USDC$19.59
0.0060531 Eth
$127,375.00
6,349.154 LINK
0.0526%
67
bitcastle
LINK-USDT$19.61
0.0060607 Eth
$122,104.00
6,091.420 LINK
0.0504%
68
Kanga
LINK-PLN$19.80
0.0061216 Eth
$101,372.00
0.000 LINK
0.0000%
69
BitMart
LINK-ETH$19.61
0.0060636 Eth
$85,842.00
4,376.940 LINK
0.0362%
70
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$19.59
0.0060558 Eth
$80,047.00
4,049.127 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0335%
71
Hotcoin
LINK-BTC$19.83
0.0060748 Eth
$60,840.00
3,067.910 LINK
0.0254%
72
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$19.66
0.0060717 Eth
$59,081.00
2,969.455 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0246%
73
Bitso
LINK-USD$19.63
0.0060667 Eth
$56,717.00
2,889.979 LINK
0.0239%
74
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$19.60
0.0060523 Eth
$53,088.00
2,647.654 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0219%
75
EXMO
LINK-BTC$19.60
0.0060601 Eth
$46,034.00
2,348.446 LINK
0.0194%
76
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$19.78
0.0060989 Eth
$38,837.00
1,857.723 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0154%
77
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$19.61
0.0060494 Eth
$34,559.00
1,750.324 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0145%
78
Bitexen
LINK-TRY$19.56
0.0060056 Eth
$33,705.00
1,723.433 LINK
0.0143%
79
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$19.63
0.0060508 Eth
$29,715.00
30,385.713 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.2515%
80
Nonkyc.io
LINK-BTC$19.55
0.0060416 Eth
$26,673.00
1,338.862 LINK
0.0111%
81
Gemini
LINK-BTC$19.66
0.0060783 Eth
$25,388.00
1,291.367 LINK
0.0107%
82
Uniswap V3 (Avalanche)
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$19.53
0.0060205 Eth
$24,808.00
1,257.830 0X5947BB275C521040051D82396192181B413227A3
0.0104%
83
bitcastle
LINK-BTC$19.62
0.0060653 Eth
$19,547.46
980.280 LINK
0.0081%
84
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$19.72
0.0060902 Eth
$18,367.54
936.412 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0078%
85
Dex-Trade
LINK-ETH$19.62
0.0060577 Eth
$16,643.93
848.390 LINK
0.0070%
86
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$19.61
0.0060553 Eth
$11,683.08
582.739 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0048%
87
KuCoin
LINK-KCS$19.61
0.0060566 Eth
$8,228.52
419.696 LINK
0.0035%
88
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XDAC17F958D2EE523A2206206994597C13D831EC7$19.60
0.0060592 Eth
$7,974.98
399.860 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0033%
89
TokoCrypto
LINK-USDT$19.73
0.0060464 Eth
$7,778.52
394.238 LINK
0.0033%
90
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$19.62
0.0060503 Eth
$6,955.38
350.642 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0029%
91
CoinEx
LINK-USDC$19.68
0.0060771 Eth
$5,285.60
264.573 LINK
0.0022%
92
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X55D398326F99059FF775485246999027B3197955$19.67
0.0060745 Eth
$4,134.68
206.111 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0017%
93
Uniswap V3 (Arbitrum One)
0XBA5DDD1F9D7F570DC94A51479A000E3BCE967196-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$19.60
0.0060430 Eth
$2,325.59
8.176 0XBA5DDD1F9D7F570DC94A51479A000E3BCE967196
0.0001%
94
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XD6DF932A45C0F255F85145F286EA0B292B21C90B$19.67
0.0060801 Eth
$1,728.18
87.941 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0007%
95
CoinEx
LINK-BTC$19.73
0.0060934 Eth
$1,701.63
85.357 LINK
0.0007%
96
Retro
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$19.68
0.0060834 Eth
$868.97
43.671 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0004%
97
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFA7F8980B0F1E64A2062791CC3B0871572F1F7F0$19.56
0.0060452 Eth
$644.14
32.580 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0003%
98
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$19.61
0.0060603 Eth
$500.52
25.046 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0002%
99
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0XDA10009CBD5D07DD0CECC66161FC93D7C9000DA1$19.56
0.0060476 Eth
$355.79
17.740 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0001%
100
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X8F3CF7AD23CD3CADBD9735AFF958023239C6A063$19.68
0.0060828 Eth
$185.16
9.234 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
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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