ETH Price: $1,792.37 (-0.52%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

750,055 ( -0.024%)

Market

Price

$12.79 @ 0.007136 ETH (+1.08%)

Onchain Market Cap

$12,790,000,000.00

Circulating Supply Market Cap

$8,174,365,702.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
1,577.37731483 LINK

Value
$20,174.66 ( ~11.2558 Eth) [0.0002%]
0x91230b91D95577CC90959f5a63F940BF6C336537
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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 11527.27% |ETH 0.0003846 1755.43%

Market

Volume (24H):$381,169,677.00
Market Capitalization:$8,174,365,702.00
Circulating Supply:638,099,971.00 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$12.75
0.0071120 Eth
$35,617,311.00
2,774,665.630 LINK
16.2354%
2
Coinbase Exchange
LINK-USD$12.78
0.0071239 Eth
$25,146,990.00
1,968,299.130 LINK
11.5171%
3
MEXC
LINK-USDT$12.76
0.0071175 Eth
$14,224,058.00
1,114,307.480 LINK
6.5202%
4
KuCoin
LINK-USDT$12.77
0.0071170 Eth
$9,572,137.00
749,843.762 LINK
4.3876%
5
Gate.io
LINK-USDT$12.77
0.0071196 Eth
$9,211,804.00
719,581.640 LINK
4.2105%
6
HTX
LINK-USDT$12.76
0.0071147 Eth
$9,200,076.00
715,587.003 LINK
4.1871%
7
Binance
LINK-USDC$12.81
0.0071302 Eth
$7,464,294.00
583,469.130 LINK
3.4141%
8
Slex
LINK-USDT$12.79
0.0071298 Eth
$7,401,599.00
574,668.570 LINK
3.3626%
9
P2B
LINK-USDT$12.81
0.0071284 Eth
$7,363,638.00
574,978.420 LINK
3.3644%
10
Upbit
LINK-KRW$12.91
0.0071975 Eth
$7,014,079.00
543,371.453 LINK
3.1794%
11
CoinW
LINK-USDT$12.78
0.0071256 Eth
$6,797,571.00
532,011.450 LINK
3.1130%
12
OKX
LINK-USDT$12.75
0.0071122 Eth
$5,666,788.00
441,991.345 LINK
2.5862%
13
Binance
LINK-FDUSD$12.80
0.0071254 Eth
$5,627,379.00
438,660.550 LINK
2.5667%
14
Bybit
LINK-USDT$12.76
0.0071175 Eth
$5,016,827.00
390,280.370 LINK
2.2837%
15
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$12.79
0.0071299 Eth
$3,946,840.00
308,959.771 0X514910771AF9CA656AF840DFF83E8264ECF986CA
1.8078%
16
WhiteBIT
LINK-USDT$12.86
0.0071725 Eth
$3,933,248.00
305,792.690 LINK
1.7893%
17
Hotcoin
LINK-USDT$12.77
0.0071166 Eth
$3,812,301.00
298,627.970 LINK
1.7474%
18
MEXC
LINK-EUR$12.75
0.0071072 Eth
$3,760,044.00
294,995.650 LINK
1.7261%
19
Coinstore
LINK-USDT$12.74
0.0071008 Eth
$3,619,135.00
282,313.670 LINK
1.6519%
20
XT.COM
LINK-USDT$12.78
0.0071224 Eth
$3,571,012.00
278,166.560 LINK
1.6276%
21
MEXC
LINK-USDC$12.82
0.0071332 Eth
$3,504,161.00
273,400.890 LINK
1.5998%
22
BTSE
LINK-USDT$12.76
0.0071176 Eth
$2,509,090.00
196,565.442 LINK
1.1502%
23
Azbit
LINK-USDT$12.82
0.0071333 Eth
$2,184,387.00
170,178.655 LINK
0.9958%
24
Coinbase Exchange
LINK-ETH$12.81
0.0071350 Eth
$2,180,175.00
170,167.480 LINK
0.9957%
25
Bitunix
LINK-USDT$12.77
0.0071197 Eth
$2,085,379.00
163,203.570 LINK
0.9550%
26
BYDFi
LINK-USDT$12.78
0.0071220 Eth
$2,040,758.00
159,720.230 LINK
0.9346%
27
QMall
LINK-USDT$12.78
0.0071235 Eth
$1,350,169.00
104,990.245 LINK
0.6143%
28
Hibt
LINK-USDT$12.78
0.0071276 Eth
$1,282,992.00
100,029.575 LINK
0.5853%
29
Biconomy.com
LINK-USDT$12.81
0.0071324 Eth
$1,231,766.00
95,853.497 LINK
0.5609%
30
Bitvavo
LINK-EUR$12.81
0.0071300 Eth
$1,217,136.00
95,049.504 LINK
0.5562%
31
Coinbase Exchange
LINK-EUR$12.78
0.0071256 Eth
$1,216,939.00
95,229.790 LINK
0.5572%
32
Dcoin
LINK-USDT$12.78
0.0071152 Eth
$1,191,191.00
93,233.000 LINK
0.5455%
33
Dex-Trade
LINK-USDT$12.79
0.0071171 Eth
$1,177,403.00
92,086.670 LINK
0.5388%
34
Bithumb
LINK-KRW$12.92
0.0072043 Eth
$1,057,247.00
81,816.705 LINK
0.4787%
35
Tapbit
LINK-USDT$12.81
0.0071324 Eth
$982,358.00
76,267.460 LINK
0.4463%
36
FMCPAY
LINK-USDT$12.81
0.0071277 Eth
$971,159.00
75,546.026 LINK
0.4420%
37
FMCPAY
LINK-ETH$12.79
0.0071239 Eth
$849,003.00
66,471.360 LINK
0.3889%
38
Coinbase Exchange
LINK-GBP$12.72
0.0070932 Eth
$752,313.00
59,125.690 LINK
0.3460%
39
WhiteBIT
LINK-USDC$12.90
0.0071940 Eth
$687,921.00
53,306.710 LINK
0.3119%
40
LATOKEN
LINK-USDT$12.82
0.0071339 Eth
$681,925.00
53,211.652 LINK
0.3114%
41
FMCPAY
LINK-BTC$12.76
0.0071170 Eth
$611,399.00
47,770.900 LINK
0.2795%
42
tanX
LINK-USDC$12.81
0.0071271 Eth
$564,973.00
43,828.910 LINK
0.2565%
43
QMall
LINK-USDC$12.78
0.0071149 Eth
$543,602.00
42,432.649 LINK
0.2483%
44
Tokpie
LINK-USDT$12.81
0.0071439 Eth
$540,167.00
42,163.243 LINK
0.2467%
45
Coinbase Exchange
LINK-BTC$12.78
0.0071246 Eth
$492,569.00
38,552.320 LINK
0.2256%
46
CoinEx
LINK-USDT$12.78
0.0071223 Eth
$453,739.00
35,289.466 LINK
0.2065%
47
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$12.78
0.0071248 Eth
$414,231.00
32,741.828 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.1916%
48
Gemini
LINK-USD$12.77
0.0071226 Eth
$398,512.00
31,197.211 LINK
0.1825%
49
BigONE
LINK-USDT$12.78
0.0071139 Eth
$379,944.00
29,727.910 LINK
0.1739%
50
Coinbase Exchange
LINK-USDT$12.78
0.0071242 Eth
$372,300.00
29,140.092 LINK
0.1705%
51
EXMO
LINK-USDT$12.79
0.0071311 Eth
$365,681.00
28,586.844 LINK
0.1673%
52
BitMart
LINK-BTC$12.77
0.0071211 Eth
$315,521.00
24,705.380 LINK
0.1446%
53
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$12.78
0.0071239 Eth
$287,297.00
22,500.247 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1317%
54
OKX
LINK-USDC$12.75
0.0071124 Eth
$281,281.00
21,884.508 LINK
0.1281%
55
XT.COM
LINK-ETH$12.77
0.0071192 Eth
$238,322.00
18,693.700 LINK
0.1094%
56
Bybit
LINK-USDC$12.77
0.0071196 Eth
$238,164.00
18,550.930 LINK
0.1085%
57
WhiteBIT
LINK-TRY$12.87
0.0071773 Eth
$231,794.00
18,010.600 LINK
0.1054%
58
BitStorage
LINK-ETH$12.78
0.0071260 Eth
$214,882.00
16,811.820 LINK
0.0984%
59
Slex
LINK-ETH$12.78
0.0071255 Eth
$211,474.00
16,569.520 LINK
0.0970%
60
WhiteBIT
LINK-BTC$12.82
0.0071473 Eth
$178,685.00
13,936.750 LINK
0.0815%
61
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$12.74
0.0071047 Eth
$169,730.00
13,352.778 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0781%
62
BitDelta
LINK-USDT$12.80
0.0071224 Eth
$163,917.00
12,765.000 LINK
0.0747%
63
Bitbank
LINK-JPY$12.78
0.0071279 Eth
$157,872.00
12,351.270 LINK
0.0723%
64
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$12.77
0.0071192 Eth
$154,974.00
12,163.649 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0712%
65
Bitci TR
LINK-TRY$12.77
0.0071133 Eth
$135,608.00
10,505.250 LINK
0.0615%
66
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$12.76
0.0071152 Eth
$131,021.00
10,294.361 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0602%
67
BYDFi
LINK-USDC$12.79
0.0071183 Eth
$126,415.00
9,884.360 LINK
0.0578%
68
Hotcoin
LINK-BTC$12.81
0.0071349 Eth
$115,646.00
9,026.200 LINK
0.0528%
69
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$12.78
0.0071248 Eth
$114,404.00
8,994.019 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0526%
70
BitMart
LINK-ETH$12.78
0.0071254 Eth
$111,025.00
8,688.520 LINK
0.0508%
71
GMO Japan
LINK-JPY$12.78
0.0071163 Eth
$110,577.00
8,653.400 LINK
0.0506%
72
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$12.77
0.0071218 Eth
$87,134.00
6,892.757 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0403%
73
bitcastle
LINK-USDT$12.76
0.0071175 Eth
$74,371.00
5,781.370 LINK
0.0338%
74
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$12.76
0.0071152 Eth
$73,646.00
73,920.495 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.4325%
75
Coinone
LINK-KRW$12.93
0.0072090 Eth
$71,795.00
5,552.990 LINK
0.0325%
76
Bitkub
LINK-THB$12.76
0.0071104 Eth
$65,618.00
5,144.173 LINK
0.0301%
77
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$12.76
0.0071152 Eth
$57,151.00
4,463.111 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0261%
78
Bitso
LINK-USD$12.87
0.0071756 Eth
$53,003.00
4,117.726 LINK
0.0241%
79
Aerodrome SlipStream
0X88FB150BDC53A65FE94DEA0C9BA0A6DAF8C6E196-0X4200000000000000000000000000000000000006$12.76
0.0071160 Eth
$49,614.00
3,901.091 0X88FB150BDC53A65FE94DEA0C9BA0A6DAF8C6E196
0.0228%
80
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$12.78
0.0071248 Eth
$42,797.00
42,592.760 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.2492%
81
Uniswap V4 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$12.77
0.0071183 Eth
$35,917.00
2,820.055 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0165%
82
WhiteBIT
LINK-EUR$12.83
0.0071528 Eth
$32,964.00
2,569.870 LINK
0.0150%
83
Bittime
LINK-IDR$12.68
0.0070623 Eth
$30,424.00
2,375.630 LINK
0.0139%
84
Bittime
LINK-USDT$12.76
0.0071138 Eth
$30,409.00
2,361.600 LINK
0.0138%
85
Dex-Trade
LINK-ETH$12.80
0.0071234 Eth
$28,903.00
2,258.590 LINK
0.0132%
86
EXMO
LINK-BTC$12.78
0.0071253 Eth
$23,399.00
1,830.716 LINK
0.0107%
87
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$12.74
0.0071011 Eth
$21,883.00
1,721.298 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0101%
88
Uniswap V4 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$12.80
0.0071391 Eth
$21,528.00
21,561.216 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.1262%
89
Hotcoin
LINK-ETH$12.78
0.0071223 Eth
$21,072.00
1,649.270 LINK
0.0097%
90
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$12.78
0.0071277 Eth
$20,179.00
1,581.006 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0093%
91
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$12.77
0.0071231 Eth
$19,412.11
1,508.113 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0088%
92
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$12.67
0.0070620 Eth
$17,463.64
1,379.675 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0081%
93
Uniswap V4 (Ethereum)
0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48-0X514910771AF9CA656AF840DFF83E8264ECF986CA$12.83
0.0071566 Eth
$16,559.20
16,304.178 0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48
0.0954%
94
Uniswap V4 (Ethereum)
0X4274CD7277C7BB0806BD5FE84B9ADAE466A8DA0A-0X514910771AF9CA656AF840DFF83E8264ECF986CA$12.84
0.0071564 Eth
$12,387.96
12,372.457 0X4274CD7277C7BB0806BD5FE84B9ADAE466A8DA0A
0.0724%
95
Kraken
LINK-AUD$12.87
0.0071741 Eth
$9,179.31
713.279 LINK
0.0042%
96
Bitexen
LINK-TRY$12.71
0.0070752 Eth
$7,551.48
594.022 LINK
0.0035%
97
Oceanex
LINK-USDT$12.79
0.0071250 Eth
$7,401.58
578.520 LINK
0.0034%
98
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$12.78
0.0071227 Eth
$7,018.65
7,019.662 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.0411%
99
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X55D398326F99059FF775485246999027B3197955$12.83
0.0071538 Eth
$6,116.84
478.466 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0028%
100
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFA7F8980B0F1E64A2062791CC3B0871572F1F7F0$12.78
0.0071248 Eth
$4,154.85
324.832 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0019%

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

API
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Deployed Bytecode

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Swarm Source

bzzr://c5f438ff94e5ddaf2058efa0019e246c636c37a622e04bb67827c7374acad8d6
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