ETH Price: $3,646.13 (+0.90%)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

729,747 ( 0.006%)

Market

Price

$23.80 @ 0.006527 ETH (+2.50%)

Onchain Market Cap

$23,800,000,000.00

Circulating Supply Market Cap

$14,988,169,036.00

Other Info

Token Contract (WITH 18 Decimals)

Filtered by Token Holder
roric.eth
Balance
0.069898892814652373 LINK

Value
$1.66 ( ~0.000455276981844934 Eth) [0.0000%]
0x589b0ca7b2d3af3a6d064886f17b9ef2b77868bc
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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 21536.36% |ETH 0.0003846 1597.09%

Market

Volume (24H):$893,760,882.00
Market Capitalization:$14,988,169,036.00
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$23.85
0.0065431 Eth
$89,705,713.00
3,800,065.960 LINK
18.6373%
2
Coinbase Exchange
LINK-USD$23.81
0.0065344 Eth
$34,691,130.00
1,456,814.750 LINK
7.1449%
3
WhiteBIT
LINK-USDT$23.80
0.0065239 Eth
$27,314,650.00
1,147,901.310 LINK
5.6298%
4
Slex
LINK-USDT$23.86
0.0065456 Eth
$24,741,145.00
1,052,516.910 LINK
5.1620%
5
Bitget
LINK-USDT$23.86
0.0065459 Eth
$23,091,209.00
979,278.253 LINK
4.8028%
6
Upbit
LINK-KRW$24.07
0.0066046 Eth
$20,537,902.00
853,231.828 LINK
4.1847%
7
Bybit
LINK-USDT$23.87
0.0065505 Eth
$20,292,920.00
860,265.140 LINK
4.2191%
8
MEXC
LINK-USDT$23.80
0.0065298 Eth
$19,217,677.00
807,590.630 LINK
3.9608%
9
P2B
LINK-USDT$23.81
0.0065385 Eth
$19,070,540.00
800,859.620 LINK
3.9278%
10
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$23.84
0.0065478 Eth
$18,360,985.00
780,097.381 0X514910771AF9CA656AF840DFF83E8264ECF986CA
3.8260%
11
CoinW
LINK-USDT$23.82
0.0065348 Eth
$16,477,549.00
691,892.410 LINK
3.3934%
12
OKX
LINK-USDT$23.89
0.0065543 Eth
$15,626,796.00
661,846.809 LINK
3.2460%
13
XT.COM
LINK-USDT$23.82
0.0065353 Eth
$8,949,848.00
379,130.380 LINK
1.8594%
14
Azbit
LINK-USDT$23.77
0.0065272 Eth
$8,848,312.00
374,983.535 LINK
1.8391%
15
HTX
LINK-USDT$23.80
0.0065297 Eth
$8,289,156.00
351,984.978 LINK
1.7263%
16
Coinstore
LINK-USDT$23.80
0.0065315 Eth
$8,201,691.00
347,663.000 LINK
1.7051%
17
Binance
LINK-FDUSD$23.74
0.0065179 Eth
$7,236,774.00
307,438.530 LINK
1.5078%
18
Bitunix
LINK-USDT$23.78
0.0065286 Eth
$7,080,268.00
297,846.730 LINK
1.4608%
19
BYDFi
LINK-USDT$23.75
0.0065235 Eth
$5,862,520.00
246,852.620 LINK
1.2107%
20
Bithumb
LINK-KRW$24.05
0.0065993 Eth
$4,891,655.00
203,393.891 LINK
0.9975%
21
Biconomy.com
LINK-USDT$23.75
0.0065239 Eth
$4,638,272.00
197,540.570 LINK
0.9688%
22
LBank
LINK-USDT$23.76
0.0065263 Eth
$4,477,809.00
188,467.420 LINK
0.9243%
23
LATOKEN
LINK-USDT$23.75
0.0065235 Eth
$4,337,364.00
182,616.893 LINK
0.8956%
24
BTSE
LINK-USDT$23.92
0.0065667 Eth
$3,854,729.00
161,146.904 LINK
0.7903%
25
Kraken
LINK-USD$23.82
0.0065370 Eth
$3,761,908.00
157,901.363 LINK
0.7744%
26
Hotcoin
LINK-USDT$23.79
0.0065344 Eth
$3,691,247.00
155,152.144 LINK
0.7609%
27
KuCoin
LINK-USDT$23.82
0.0065350 Eth
$3,626,573.00
152,275.355 LINK
0.7468%
28
Dex-Trade
LINK-USDT$23.79
0.0065301 Eth
$2,921,861.00
122,806.510 LINK
0.6023%
29
CoinEx
LINK-USDT$23.76
0.0065272 Eth
$2,553,914.00
108,349.935 LINK
0.5314%
30
Bitvavo
LINK-EUR$23.82
0.0065413 Eth
$2,162,081.00
90,758.086 LINK
0.4451%
31
Dcoin
LINK-USDT$23.84
0.0065422 Eth
$2,132,230.00
89,431.000 LINK
0.4386%
32
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$23.70
0.0065104 Eth
$2,067,077.00
88,415.594 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.4336%
33
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$23.76
0.0065265 Eth
$2,020,820.00
85,892.231 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.4213%
34
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$23.76
0.0065254 Eth
$2,002,362.00
85,237.934 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.4180%
35
Coinbase Exchange
LINK-EUR$23.78
0.0065286 Eth
$1,705,177.00
71,716.450 LINK
0.3517%
36
PointPay
LINK-USDT$23.79
0.0065302 Eth
$1,367,531.00
58,000.433 LINK
0.2845%
37
tanX
LINK-USDC$23.81
0.0065401 Eth
$1,319,021.00
56,050.780 LINK
0.2749%
38
EXMO
LINK-USDT$23.80
0.0065333 Eth
$1,278,223.00
53,698.339 LINK
0.2634%
39
Bybit
LINK-USDC$23.78
0.0065251 Eth
$1,134,235.00
48,043.171 LINK
0.2356%
40
WhiteBIT
LINK-BTC$23.80
0.0065316 Eth
$1,121,761.00
47,137.140 LINK
0.2312%
41
Kraken
LINK-EUR$23.81
0.0065344 Eth
$1,061,295.00
44,564.474 LINK
0.2186%
42
WhiteBIT
LINK-TRY$23.79
0.0065294 Eth
$1,006,076.00
42,290.380 LINK
0.2074%
43
Phemex
LINK-USDT$23.77
0.0065275 Eth
$975,034.00
41,015.650 LINK
0.2012%
44
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$23.85
0.0065455 Eth
$943,980.00
61,458.669 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.3014%
45
Gemini
LINK-USD$23.81
0.0065326 Eth
$884,035.00
37,133.138 LINK
0.1821%
46
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$23.88
0.0065589 Eth
$868,225.00
36,847.928 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1807%
47
EarnBIT
LINK-USDT$23.82
0.0065372 Eth
$764,180.00
32,336.061 LINK
0.1586%
48
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$23.78
0.0065323 Eth
$688,345.00
29,126.389 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1428%
49
BigONE
LINK-USDT$23.72
0.0065146 Eth
$614,699.00
25,915.970 LINK
0.1271%
50
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$23.75
0.0065232 Eth
$607,914.00
601,732.380 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
2.9512%
51
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$23.74
0.0065147 Eth
$588,341.00
24,779.335 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.1215%
52
Bitbank
LINK-JPY$23.80
0.0065298 Eth
$587,808.00
24,700.920 LINK
0.1211%
53
Coinbase Exchange
LINK-USDT$23.79
0.0065267 Eth
$586,505.00
24,656.797 LINK
0.1209%
54
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$23.84
0.0065478 Eth
$533,607.00
22,566.278 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.1107%
55
Binance
LINK-EUR$23.82
0.0065402 Eth
$505,129.00
21,257.400 LINK
0.1043%
56
Bitbegin
LINK-USDT$23.79
0.0065286 Eth
$497,199.00
21,132.845 LINK
0.1036%
57
WhiteBIT
LINK-EUR$24.01
0.0065850 Eth
$400,956.00
16,696.830 LINK
0.0819%
58
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$23.73
0.0065187 Eth
$393,851.00
391,216.522 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
1.9187%
59
Coinbase Exchange
LINK-GBP$23.76
0.0065239 Eth
$389,429.00
16,390.470 LINK
0.0804%
60
HashKey Exchange
LINK-USD$23.84
0.0065421 Eth
$369,258.00
15,576.221 LINK
0.0764%
61
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$23.70
0.0065104 Eth
$340,196.00
14,468.161 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0710%
62
OKX
LINK-USDC$23.88
0.0065527 Eth
$322,784.00
13,668.456 LINK
0.0670%
63
Coinbase Exchange
LINK-ETH$23.81
0.0065323 Eth
$303,968.00
12,768.490 LINK
0.0626%
64
BitMart
LINK-BTC$23.80
0.0065333 Eth
$256,270.00
10,765.880 LINK
0.0528%
65
Bitci TR
LINK-TRY$24.03
0.0065873 Eth
$240,197.00
10,188.420 LINK
0.0500%
66
GMO Japan
LINK-JPY$23.83
0.0065383 Eth
$233,835.00
9,811.700 LINK
0.0481%
67
BitDelta
LINK-USDT$23.78
0.0065313 Eth
$222,452.00
9,459.000 LINK
0.0464%
68
Bitkub
LINK-THB$23.65
0.0064955 Eth
$180,866.00
7,648.150 LINK
0.0375%
69
Coinone
LINK-KRW$24.00
0.0065861 Eth
$178,415.00
7,433.290 LINK
0.0365%
70
Slex
LINK-ETH$23.78
0.0065302 Eth
$167,112.00
7,099.490 LINK
0.0348%
71
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$23.79
0.0065355 Eth
$140,892.00
5,979.112 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0293%
72
DeGate
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$23.82
0.0065359 Eth
$140,498.00
5,953.175 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0292%
73
LATOKEN
LINK-BTC$23.87
0.0065442 Eth
$140,417.00
5,883.784 LINK
0.0289%
74
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$23.77
0.0065242 Eth
$139,256.00
5,927.585 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0291%
75
BitStorage
LINK-ETH$23.79
0.0065312 Eth
$127,014.00
5,339.530 LINK
0.0262%
76
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$23.86
0.0065522 Eth
$124,955.00
5,289.479 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0259%
77
Hotcoin
LINK-BTC$23.86
0.0065474 Eth
$122,547.00
5,135.810 LINK
0.0252%
78
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$23.73
0.0065187 Eth
$110,692.00
4,699.763 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0230%
79
PointPay
LINK-BTC$23.79
0.0065298 Eth
$110,213.00
4,643.376 LINK
0.0228%
80
Mercado Bitcoin
LINK-BRL$23.92
0.0065627 Eth
$110,032.00
4,600.730 LINK
0.0226%
81
Nonkyc.io
LINK-BTC$23.95
0.0065717 Eth
$105,583.00
4,465.109 LINK
0.0219%
82
BitMart
LINK-ETH$23.81
0.0065354 Eth
$89,663.00
3,765.540 LINK
0.0185%
83
Bitso
LINK-USD$23.76
0.0065268 Eth
$89,025.00
3,746.483 LINK
0.0184%
84
Foxbit
LINK-BRL$23.87
0.0065581 Eth
$86,499.00
3,623.548 LINK
0.0178%
85
Bitexen
LINK-TRY$23.70
0.0065053 Eth
$80,808.00
3,410.113 LINK
0.0167%
86
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$23.66
0.0064986 Eth
$79,516.00
3,380.508 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0166%
87
EXMO
LINK-BTC$23.79
0.0065305 Eth
$77,160.00
3,242.864 LINK
0.0159%
88
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$23.70
0.0065104 Eth
$55,621.00
55,143.622 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.2705%
89
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$23.85
0.0065496 Eth
$55,606.00
2,349.084 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0115%
90
Binance US
LINK-USDT$23.81
0.0065395 Eth
$54,310.00
2,281.000 LINK
0.0112%
91
BTCMarkets
LINK-AUD$23.85
0.0065471 Eth
$53,554.00
2,245.406 LINK
0.0110%
92
THENA FUSION
0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$23.81
0.0065394 Eth
$45,156.00
57.451 0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827
0.0003%
93
Hotcoin
LINK-ETH$23.77
0.0065282 Eth
$44,484.00
1,871.580 LINK
0.0092%
94
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$23.85
0.0065455 Eth
$39,220.00
2,579.441 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.0127%
95
CoinEx
LINK-USDC$23.86
0.0065474 Eth
$35,270.00
1,483.983 LINK
0.0073%
96
HTX
LINK-BTC$23.69
0.0065014 Eth
$32,027.00
1,357.529 LINK
0.0067%
97
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$23.79
0.0065354 Eth
$32,016.00
1,412.888 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0069%
98
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$23.74
0.0065211 Eth
$26,206.00
1,113.962 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0055%
99
LFJ
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$23.71
0.0065129 Eth
$19,753.59
826.191 0X5947BB275C521040051D82396192181B413227A3
0.0041%
100
Dex-Trade
LINK-ETH$23.76
0.0065226 Eth
$17,906.45
753.480 LINK
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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