ETH Price: $3,222.04 (-0.67%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

726,128 ( -0.017%)

Market

Price

$20.63 @ 0.006403 ETH (+3.76%)

Onchain Market Cap

$20,630,000,000.00

Circulating Supply Market Cap

$13,024,206,369.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
0 LINK

Value
$0.00
0x3744044fc6666f8a1c4e843a6106676022dc3e4e
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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 18654.55% |ETH 0.0003846 1564.85%

Market

Volume (24H):$662,717,881.00
Market Capitalization:$13,024,206,369.00
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$20.55
0.0063582 Eth
$89,972,070.00
4,425,371.830 LINK
22.7755%
2
Coinbase Exchange
LINK-USD$20.49
0.0063653 Eth
$32,528,653.00
1,587,615.430 LINK
8.1708%
3
Slex
LINK-USDT$20.48
0.0063591 Eth
$20,272,198.00
999,003.330 LINK
5.1414%
4
P2B
LINK-USDT$20.50
0.0063670 Eth
$18,241,203.00
889,707.350 LINK
4.5789%
5
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$20.66
0.0064157 Eth
$17,432,252.00
852,938.968 0X514910771AF9CA656AF840DFF83E8264ECF986CA
4.3897%
6
Bitget
LINK-USDT$20.48
0.0063591 Eth
$15,575,800.00
767,616.858 LINK
3.9506%
7
Gate.io
LINK-USDT$20.49
0.0063605 Eth
$13,984,629.00
690,662.077 LINK
3.5545%
8
Bybit
LINK-USDT$20.49
0.0063626 Eth
$13,641,880.00
671,238.438 LINK
3.4546%
9
DigiFinex
LINK-USDT$20.47
0.0063554 Eth
$11,145,302.00
544,448.760 LINK
2.8020%
10
HTX
LINK-USDT$20.47
0.0063562 Eth
$9,960,297.00
490,570.064 LINK
2.5248%
11
OKX
LINK-USDT$20.49
0.0063622 Eth
$9,749,798.00
479,979.665 LINK
2.4703%
12
MEXC
LINK-USDT$20.47
0.0063537 Eth
$9,580,557.00
468,122.490 LINK
2.4092%
13
XT.COM
LINK-USDT$20.47
0.0063542 Eth
$9,055,676.00
446,064.490 LINK
2.2957%
14
Azbit
LINK-USDT$20.63
0.0063780 Eth
$8,546,140.00
420,981.828 LINK
2.1666%
15
Coinstore
LINK-USDT$20.63
0.0063775 Eth
$8,174,029.00
403,037.040 LINK
2.0743%
16
CoinW
LINK-USDT$20.46
0.0063503 Eth
$7,607,263.00
371,901.900 LINK
1.9140%
17
Bitunix
LINK-USDT$20.50
0.0063650 Eth
$6,894,137.00
336,217.410 LINK
1.7304%
18
Binance
LINK-FDUSD$20.58
0.0063617 Eth
$6,592,653.00
325,147.920 LINK
1.6734%
19
Hotcoin
LINK-USDT$20.50
0.0063628 Eth
$6,254,569.00
305,053.470 LINK
1.5700%
20
BYDFi
LINK-USDT$20.58
0.0063638 Eth
$5,153,446.00
250,364.260 LINK
1.2885%
21
LBank
LINK-USDT$20.47
0.0063542 Eth
$4,514,285.00
220,553.450 LINK
1.1351%
22
LATOKEN
LINK-USDT$20.64
0.0063816 Eth
$4,357,853.00
211,112.354 LINK
1.0865%
23
QMall
LINK-USDT$20.48
0.0063576 Eth
$3,528,300.00
173,727.056 LINK
0.8941%
24
BTSE
LINK-USDT$20.48
0.0063596 Eth
$3,474,691.00
169,642.695 LINK
0.8731%
25
Kraken
LINK-USD$20.48
0.0063585 Eth
$3,400,669.00
166,015.599 LINK
0.8544%
26
Dex-Trade
LINK-USDT$20.50
0.0063642 Eth
$2,844,338.00
138,779.820 LINK
0.7142%
27
KuCoin
LINK-USDT$20.48
0.0063610 Eth
$2,806,793.00
137,029.168 LINK
0.7052%
28
FMCPAY
LINK-USDT$20.48
0.0063598 Eth
$2,509,546.00
123,324.517 LINK
0.6347%
29
Curve (Ethereum)
0XB8B295DF2CD735B15BE5EB419517AA626FC43CD5-0X514910771AF9CA656AF840DFF83E8264ECF986CA$20.65
0.0063842 Eth
$2,146,298.00
105,067.460 0XB8B295DF2CD735B15BE5EB419517AA626FC43CD5
0.5407%
30
Coinbase Exchange
LINK-EUR$20.49
0.0063615 Eth
$2,058,648.00
100,476.940 LINK
0.5171%
31
Coinbase Exchange
LINK-GBP$20.46
0.0063535 Eth
$1,927,871.00
94,212.560 LINK
0.4849%
32
Bitvavo
LINK-EUR$20.48
0.0063586 Eth
$1,886,400.00
92,111.678 LINK
0.4741%
33
Biconomy.com
LINK-USDT$20.46
0.0063562 Eth
$1,782,757.00
87,861.020 LINK
0.4522%
34
CoinEx
LINK-USDT$20.59
0.0063794 Eth
$1,718,272.00
84,502.261 LINK
0.4349%
35
PointPay
LINK-USDT$20.48
0.0063563 Eth
$1,374,084.00
67,695.097 LINK
0.3484%
36
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$20.45
0.0063522 Eth
$1,266,780.00
62,322.800 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.3207%
37
FMCPAY
LINK-ETH$20.48
0.0063582 Eth
$1,245,946.00
61,328.320 LINK
0.3156%
38
FMCPAY
LINK-BTC$20.48
0.0063568 Eth
$1,203,308.00
59,129.700 LINK
0.3043%
39
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$20.45
0.0063484 Eth
$1,202,390.00
59,093.915 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.3041%
40
EXMO
LINK-USDT$20.51
0.0063691 Eth
$1,000,922.00
48,794.024 LINK
0.2511%
41
Phemex
LINK-USDT$20.50
0.0063658 Eth
$940,806.00
45,887.360 LINK
0.2362%
42
Trubit
LINK-USDT$20.47
0.0063563 Eth
$838,356.00
41,374.430 LINK
0.2129%
43
BigONE
LINK-USDT$20.54
0.0063784 Eth
$816,075.00
39,732.420 LINK
0.2045%
44
BitStorage
LINK-USDT$20.47
0.0063532 Eth
$734,125.00
35,857.380 LINK
0.1845%
45
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$20.51
0.0063708 Eth
$605,371.00
29,704.993 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1529%
46
Gemini
LINK-USD$20.49
0.0063600 Eth
$599,267.00
29,253.228 LINK
0.1506%
47
Bitbank
LINK-JPY$20.50
0.0063640 Eth
$479,210.00
23,379.673 LINK
0.1203%
48
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$20.48
0.0063568 Eth
$420,121.00
20,633.463 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1062%
49
Coinbase Exchange
LINK-USDT$20.48
0.0063591 Eth
$415,386.00
20,279.833 LINK
0.1044%
50
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$20.47
0.0063574 Eth
$415,265.00
412,242.063 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
2.1216%
51
Bybit
LINK-USDC$20.46
0.0063521 Eth
$414,711.00
20,413.090 LINK
0.1051%
52
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$20.47
0.0063551 Eth
$411,048.00
20,234.027 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.1041%
53
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$20.50
0.0063657 Eth
$398,528.00
393,767.682 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
2.0266%
54
itBit
LINK-USD$20.45
0.0063495 Eth
$322,292.00
15,760.011 LINK
0.0811%
55
QMall
LINK-USDC$20.47
0.0063562 Eth
$317,146.00
15,619.872 LINK
0.0804%
56
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$20.49
0.0063611 Eth
$310,248.00
15,226.108 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0784%
57
Coinbase Exchange
LINK-ETH$20.47
0.0063556 Eth
$292,264.00
14,274.390 LINK
0.0735%
58
Coinbase Exchange
LINK-BTC$20.48
0.0063634 Eth
$262,786.00
12,829.370 LINK
0.0660%
59
BitMart
LINK-BTC$20.47
0.0063572 Eth
$260,059.00
12,703.820 LINK
0.0654%
60
BitDelta
LINK-USDT$20.61
0.0063728 Eth
$228,549.00
11,271.000 LINK
0.0580%
61
Hotcoin
LINK-BTC$20.49
0.0063631 Eth
$227,559.00
11,104.860 LINK
0.0572%
62
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$20.50
0.0063662 Eth
$215,752.00
16,163.155 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.0832%
63
Bitkub
LINK-THB$20.55
0.0063784 Eth
$213,965.00
10,409.537 LINK
0.0536%
64
Bitci TR
LINK-TRY$20.44
0.0063467 Eth
$199,905.00
9,836.274 LINK
0.0506%
65
bitcastle
LINK-USDT$20.48
0.0063591 Eth
$179,959.00
8,866.020 LINK
0.0456%
66
Slex
LINK-ETH$20.49
0.0063612 Eth
$173,938.00
8,557.650 LINK
0.0440%
67
OKX
LINK-USDC$20.51
0.0063671 Eth
$167,509.00
8,261.855 LINK
0.0425%
68
Kraken
LINK-GBP$20.47
0.0063531 Eth
$157,470.00
7,693.978 LINK
0.0396%
69
Kraken
LINK-ETH$20.66
0.0064140 Eth
$137,296.00
6,644.580 LINK
0.0342%
70
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$20.50
0.0063675 Eth
$137,025.00
6,753.289 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0348%
71
BitStorage
LINK-ETH$20.62
0.0063734 Eth
$132,413.00
6,422.460 LINK
0.0331%
72
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$20.48
0.0063599 Eth
$130,958.00
6,441.201 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0332%
73
DeGate
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$20.49
0.0063612 Eth
$130,191.00
6,416.301 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0330%
74
LATOKEN
LINK-BTC$20.50
0.0063612 Eth
$103,391.00
5,043.975 LINK
0.0260%
75
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$20.48
0.0063601 Eth
$102,884.00
5,060.820 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0260%
76
BitMart
LINK-ETH$20.48
0.0063589 Eth
$88,032.00
4,299.200 LINK
0.0221%
77
Binance US
LINK-USDT$20.51
0.0063701 Eth
$78,767.00
3,839.976 LINK
0.0198%
78
Hotcoin
LINK-ETH$20.48
0.0063595 Eth
$75,855.00
3,703.480 LINK
0.0191%
79
Bitso
LINK-USD$20.65
0.0064116 Eth
$74,872.00
3,626.466 LINK
0.0187%
80
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$20.56
0.0063849 Eth
$67,874.00
3,346.886 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0172%
81
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$20.45
0.0063522 Eth
$57,331.00
2,813.008 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0145%
82
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$20.58
0.0063857 Eth
$56,989.00
2,816.412 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0145%
83
KuCoin
LINK-USDC$20.49
0.0063616 Eth
$55,769.00
2,722.418 LINK
0.0140%
84
Nonkyc.io
LINK-BTC$20.54
0.0063806 Eth
$48,185.00
2,360.480 LINK
0.0121%
85
Mercado Bitcoin
LINK-BRL$20.44
0.0063486 Eth
$44,955.00
2,199.867 LINK
0.0113%
86
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$20.45
0.0063484 Eth
$43,713.00
43,346.293 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.2231%
87
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$20.47
0.0063557 Eth
$43,035.00
2,114.631 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0109%
88
THENA FUSION
0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$20.52
0.0063740 Eth
$35,646.00
46.511 0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827
0.0002%
89
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$20.60
0.0063964 Eth
$32,747.00
2,441.566 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.0126%
90
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$20.48
0.0063592 Eth
$29,401.00
1,448.188 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0075%
91
Bitexen
LINK-TRY$20.35
0.0063044 Eth
$23,320.00
1,146.213 LINK
0.0059%
92
Dex-Trade
LINK-ETH$20.48
0.0063582 Eth
$17,445.60
852.000 LINK
0.0044%
93
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$20.45
0.0063514 Eth
$16,776.63
828.413 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0043%
94
LFJ
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$20.62
0.0064008 Eth
$16,349.91
795.820 0X5947BB275C521040051D82396192181B413227A3
0.0041%
95
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XDAC17F958D2EE523A2206206994597C13D831EC7$20.52
0.0063707 Eth
$15,374.35
754.291 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0039%
96
Gemini
LINK-BTC$20.50
0.0063646 Eth
$14,648.09
714.527 LINK
0.0037%
97
Pangolin
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$20.56
0.0063842 Eth
$10,003.23
485.377 0X5947BB275C521040051D82396192181B413227A3
0.0025%
98
Biswap V3
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$20.55
0.0063829 Eth
$9,844.46
483.840 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0025%
99
Ace
LINK-USDT$20.47
0.0063545 Eth
$3,659.26
180.450 LINK
0.0009%
100
KuCoin
LINK-KCS$20.54
0.0063782 Eth
$1,843.51
89.758 LINK
0.0005%

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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