ETH Price: $3,116.08 (-5.57%)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

732,942 ( 0.049%)

Market

Price

$22.96 @ 0.007368 ETH (-8.42%)

Onchain Market Cap

$22,960,000,000.00

Circulating Supply Market Cap

$14,656,321,126.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
3.58677226 LINK

Value
$82.35 ( ~0.0264274583999708 Eth) [0.0000%]
0xfB16A83cd2b4Df23CF0b4a0A0ee915CCf4FB9DD1
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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 20772.73% |ETH 0.0003846 1815.76%

Market

Volume (24H):$799,416,163.00
Market Capitalization:$14,656,321,126.00
Circulating Supply:638,099,970.00 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$22.82
0.0073195 Eth
$110,515,882.00
4,476,188.400 LINK
22.7219%
2
Coinbase Exchange
LINK-USD$22.79
0.0073195 Eth
$46,341,936.00
2,033,432.920 LINK
10.3220%
3
Bybit
LINK-USDT$23.08
0.0073594 Eth
$33,266,406.00
1,349,221.494 LINK
6.8489%
4
P2B
LINK-USDT$23.06
0.0073358 Eth
$21,653,313.00
939,143.630 LINK
4.7673%
5
OKX
LINK-USDT$22.87
0.0073322 Eth
$19,791,911.00
805,458.585 LINK
4.0886%
6
Slex
LINK-USDT$22.88
0.0073307 Eth
$17,507,220.00
708,023.940 LINK
3.5940%
7
HTX
LINK-USDT$23.03
0.0073561 Eth
$13,494,738.00
544,756.031 LINK
2.7653%
8
DigiFinex
LINK-USDT$23.00
0.0073525 Eth
$13,408,012.00
582,842.480 LINK
2.9586%
9
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$22.93
0.0073629 Eth
$13,140,919.00
553,219.417 0X514910771AF9CA656AF840DFF83E8264ECF986CA
2.8082%
10
XT.COM
LINK-USDT$22.80
0.0073214 Eth
$11,078,634.00
448,817.730 LINK
2.2783%
11
Azbit
LINK-USDT$22.86
0.0073361 Eth
$10,896,371.00
441,116.679 LINK
2.2392%
12
Coinstore
LINK-USDT$22.90
0.0073216 Eth
$9,945,527.00
402,482.410 LINK
2.0431%
13
MEXC
LINK-USDT$22.80
0.0073205 Eth
$9,480,947.00
415,788.870 LINK
2.1106%
14
KuCoin
LINK-USDT$22.83
0.0073313 Eth
$9,401,769.00
411,819.218 LINK
2.0905%
15
Bitunix
LINK-USDT$23.00
0.0073467 Eth
$8,131,436.00
353,441.220 LINK
1.7941%
16
Binance
LINK-USDC$23.04
0.0073530 Eth
$7,111,539.00
290,213.810 LINK
1.4732%
17
Binance
LINK-FDUSD$22.81
0.0073099 Eth
$6,942,867.00
283,490.830 LINK
1.4390%
18
CoinW
LINK-USDT$22.93
0.0073487 Eth
$6,464,515.00
281,954.450 LINK
1.4312%
19
BYDFi
LINK-USDT$22.83
0.0073306 Eth
$5,700,287.00
249,644.700 LINK
1.2672%
20
Kraken
LINK-USD$23.02
0.0073406 Eth
$5,671,858.00
246,341.273 LINK
1.2505%
21
BTSE
LINK-USDT$22.83
0.0073241 Eth
$5,595,467.00
245,072.575 LINK
1.2440%
22
LATOKEN
LINK-USDT$22.90
0.0073217 Eth
$5,114,341.00
223,349.537 LINK
1.1338%
23
LBank
LINK-USDT$23.01
0.0073484 Eth
$4,978,980.00
216,410.860 LINK
1.0985%
24
QMall
LINK-USDT$23.06
0.0073645 Eth
$4,464,250.00
180,040.325 LINK
0.9139%
25
FMCPAY
LINK-USDT$22.90
0.0073265 Eth
$4,412,712.00
180,009.044 LINK
0.9138%
26
Bitvavo
LINK-EUR$23.17
0.0073895 Eth
$3,826,379.00
165,139.259 LINK
0.8383%
27
Coinbase Exchange
LINK-EUR$23.01
0.0073516 Eth
$3,752,812.00
163,124.260 LINK
0.8280%
28
Dex-Trade
LINK-USDT$22.93
0.0073323 Eth
$3,319,052.00
144,758.960 LINK
0.7348%
29
Hotcoin
LINK-USDT$22.82
0.0073222 Eth
$2,949,118.00
129,210.500 LINK
0.6559%
30
CoinEx
LINK-USDT$22.84
0.0073331 Eth
$2,086,082.00
85,867.790 LINK
0.4359%
31
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$23.02
0.0073573 Eth
$1,981,162.00
83,863.312 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.4257%
32
PointPay
LINK-USDT$22.82
0.0073270 Eth
$1,755,366.00
71,118.157 LINK
0.3610%
33
FMCPAY
LINK-BTC$23.15
0.0073588 Eth
$1,741,641.00
71,396.300 LINK
0.3624%
34
FMCPAY
LINK-ETH$23.15
0.0073731 Eth
$1,708,497.00
71,398.880 LINK
0.3624%
35
Coinbase Exchange
LINK-GBP$22.77
0.0073097 Eth
$1,534,922.00
67,419.150 LINK
0.3422%
36
tanX
LINK-USDC$22.80
0.0073198 Eth
$1,126,887.00
45,978.470 LINK
0.2334%
37
EXMO
LINK-USDT$22.80
0.0073224 Eth
$1,114,137.00
48,867.969 LINK
0.2481%
38
Phemex
LINK-USDT$22.74
0.0073018 Eth
$1,075,080.00
47,272.040 LINK
0.2400%
39
Binance
LINK-TRY$23.32
0.0074380 Eth
$1,013,706.00
40,860.410 LINK
0.2074%
40
Bitstamp
LINK-USD$22.81
0.0073250 Eth
$972,232.00
42,623.071 LINK
0.2164%
41
EarnBIT
LINK-USDT$23.10
0.0073704 Eth
$919,645.00
37,318.762 LINK
0.1894%
42
Bitbank
LINK-JPY$22.87
0.0073434 Eth
$898,306.00
39,271.160 LINK
0.1993%
43
Binance
LINK-EUR$22.95
0.0073639 Eth
$880,160.00
35,972.850 LINK
0.1826%
44
Bybit
LINK-USDC$22.88
0.0073395 Eth
$877,542.00
35,809.545 LINK
0.1818%
45
Bitstamp
LINK-EUR$22.89
0.0073493 Eth
$846,446.00
36,975.839 LINK
0.1877%
46
BitStorage
LINK-USDT$23.06
0.0073540 Eth
$822,751.00
35,684.600 LINK
0.1811%
47
WhiteBIT
LINK-TRY$23.22
0.0074169 Eth
$803,577.00
34,612.830 LINK
0.1757%
48
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$22.92
0.0073615 Eth
$780,281.00
33,048.183 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1678%
49
Azbit
LINK-ETH$23.09
0.0073621 Eth
$741,288.00
31,138.457 LINK
0.1581%
50
Trubit
LINK-USDT$22.79
0.0073163 Eth
$731,896.00
29,807.620 LINK
0.1513%
51
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$23.00
0.0073878 Eth
$667,473.00
27,647.176 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.1403%
52
Coinbase Exchange
LINK-BTC$22.86
0.0073385 Eth
$638,000.00
27,909.710 LINK
0.1417%
53
QMall
LINK-USDC$22.92
0.0073440 Eth
$605,629.00
24,700.200 LINK
0.1254%
54
Gemini
LINK-USD$22.91
0.0073339 Eth
$543,777.00
23,738.764 LINK
0.1205%
55
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$22.86
0.0073398 Eth
$537,078.00
21,992.343 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.1116%
56
WhiteBIT
LINK-BTC$22.94
0.0073516 Eth
$502,647.00
21,907.300 LINK
0.1112%
57
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$22.74
0.0072914 Eth
$487,935.00
20,724.738 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.1052%
58
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$22.79
0.0073174 Eth
$466,766.00
19,721.721 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1001%
59
HashKey Exchange
LINK-USD$22.89
0.0073500 Eth
$464,605.00
18,987.380 LINK
0.0964%
60
Coinbase Exchange
LINK-USDT$22.77
0.0073104 Eth
$459,583.00
20,187.676 LINK
0.1025%
61
BigONE
LINK-USDT$22.85
0.0073401 Eth
$456,925.00
19,993.120 LINK
0.1015%
62
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$22.79
0.0073206 Eth
$456,070.00
493,029.096 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
2.5027%
63
LATOKEN
LINK-BTC$22.97
0.0073428 Eth
$452,768.00
19,712.980 LINK
0.1001%
64
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$22.80
0.0073196 Eth
$442,245.00
19,216.127 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0975%
65
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$23.13
0.0074060 Eth
$400,318.00
16,785.488 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0852%
66
OKX
LINK-USDC$23.02
0.0073521 Eth
$384,689.00
15,546.959 LINK
0.0789%
67
itBit
LINK-USD$23.01
0.0073529 Eth
$359,121.00
15,607.180 LINK
0.0792%
68
WhiteBIT
LINK-EUR$22.98
0.0073585 Eth
$324,450.00
14,116.280 LINK
0.0717%
69
GMO Japan
LINK-JPY$22.89
0.0073515 Eth
$301,539.00
13,171.200 LINK
0.0669%
70
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$22.79
0.0073199 Eth
$291,035.00
11,703.576 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0594%
71
BitMart
LINK-BTC$22.84
0.0073357 Eth
$255,352.00
11,179.820 LINK
0.0568%
72
DeGate
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$22.96
0.0073318 Eth
$254,995.00
10,316.727 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0524%
73
Slex
LINK-ETH$23.04
0.0073502 Eth
$250,687.00
10,513.000 LINK
0.0534%
74
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$22.99
0.0073374 Eth
$211,437.00
19,783.221 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.1004%
75
BitStorage
LINK-ETH$23.16
0.0073679 Eth
$210,405.00
9,086.390 LINK
0.0461%
76
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$22.83
0.0073317 Eth
$195,881.00
8,406.369 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0427%
77
PointPay
LINK-BTC$22.81
0.0073246 Eth
$180,647.00
7,490.704 LINK
0.0380%
78
Bitci TR
LINK-TRY$23.33
0.0074367 Eth
$164,010.00
6,652.310 LINK
0.0338%
79
Coinbase Exchange
LINK-ETH$22.83
0.0073304 Eth
$146,276.00
6,406.020 LINK
0.0325%
80
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$22.95
0.0073675 Eth
$141,928.00
5,732.653 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0291%
81
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$22.82
0.0073283 Eth
$115,119.00
4,884.026 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0248%
82
KuCoin
LINK-USDC$22.93
0.0073314 Eth
$112,796.00
4,919.447 LINK
0.0250%
83
Hotcoin
LINK-BTC$22.86
0.0073317 Eth
$105,840.00
4,629.450 LINK
0.0235%
84
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$22.86
0.0073398 Eth
$99,458.00
106,225.745 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.5392%
85
Bitkub
LINK-THB$23.26
0.0074210 Eth
$97,780.00
4,203.019 LINK
0.0213%
86
Binance US
LINK-USDT$22.81
0.0073232 Eth
$93,582.00
4,103.501 LINK
0.0208%
87
EXMO
LINK-BTC$23.02
0.0073894 Eth
$92,360.00
4,012.503 LINK
0.0204%
88
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$22.79
0.0073192 Eth
$82,378.00
89,197.600 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.4528%
89
BitMart
LINK-ETH$22.83
0.0073318 Eth
$80,914.00
3,544.440 LINK
0.0180%
90
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$22.77
0.0073126 Eth
$80,397.00
3,349.762 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0170%
91
KuCoin
LINK-BTC$22.86
0.0073280 Eth
$73,152.00
3,199.999 LINK
0.0162%
92
Bitso
LINK-USD$23.00
0.0073497 Eth
$69,081.00
3,003.491 LINK
0.0152%
93
Gemini
LINK-BTC$23.05
0.0073617 Eth
$67,897.00
2,945.824 LINK
0.0150%
94
PancakeSwap (v2)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$22.92
0.0073614 Eth
$55,658.00
2,307.441 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0117%
95
Kanga
LINK-PLN$23.17
0.0074035 Eth
$47,258.00
0.000 LINK
0.0000%
96
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X1BFD67037B42CF73ACF2047067BD4F2C47D9BFD6$23.12
0.0073894 Eth
$43,520.00
1,799.968 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0091%
97
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XDAC17F958D2EE523A2206206994597C13D831EC7$22.95
0.0073675 Eth
$40,932.00
1,669.193 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0085%
98
Uniswap V3 (Avalanche)
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$22.45
0.0072072 Eth
$36,670.00
1,588.110 0X5947BB275C521040051D82396192181B413227A3
0.0081%
99
Dex-Trade
LINK-ETH$22.78
0.0073147 Eth
$30,794.00
1,351.860 LINK
0.0069%
100
Ace
LINK-USDT$23.09
0.0073811 Eth
$4,391.20
177.510 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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