ETH Price: $2,908.80 (+3.17%)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

722,680 ( 0.001%)

Market

Price

$12.96 @ 0.004455 ETH (+5.13%)

Onchain Market Cap

$12,960,000,000.00

Circulating Supply Market Cap

$8,111,062,408.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
0 LINK

Value
$0.00
0xcfa31874575e7171971dbf9f0a7b1629e0a834f4
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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 11681.82% |ETH 0.0003846 1058.35%

Market

Volume (24H):$560,596,257.00
Market Capitalization:$8,111,062,408.00
Circulating Supply:626,849,971.00 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
WhiteBIT
LINK-USDT$12.95
0.0044475 Eth
$46,764,628.00
3,609,899.910 LINK
15.0321%
2
Binance
LINK-USDT$12.94
0.0044428 Eth
$43,433,753.00
3,451,294.810 LINK
14.3717%
3
Coinbase Exchange
LINK-USD$12.93
0.0044406 Eth
$23,104,588.00
1,787,589.050 LINK
7.4438%
4
HTX
LINK-USDT$12.90
0.0044326 Eth
$13,314,274.00
1,062,197.129 LINK
4.4231%
5
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$12.94
0.0044509 Eth
$12,391,985.00
974,859.584 0X514910771AF9CA656AF840DFF83E8264ECF986CA
4.0595%
6
MEXC
LINK-USDT$12.89
0.0044188 Eth
$11,273,947.00
874,858.640 LINK
3.6430%
7
BTSE
LINK-USDT$12.90
0.0044343 Eth
$9,472,690.00
734,308.270 LINK
3.0578%
8
Bitget
LINK-USDT$12.89
0.0044327 Eth
$9,449,079.00
753,913.345 LINK
3.1394%
9
P2B
LINK-USDT$12.94
0.0044472 Eth
$9,183,072.00
709,432.280 LINK
2.9542%
10
Bybit
LINK-USDT$12.89
0.0044317 Eth
$8,118,162.00
647,296.652 LINK
2.6954%
11
Gate.io
LINK-USDT$12.93
0.0044442 Eth
$7,729,968.00
614,600.640 LINK
2.5593%
12
Slex
LINK-USDT$12.93
0.0044437 Eth
$7,423,290.00
590,628.890 LINK
2.4595%
13
Hotcoin
LINK-USDT$12.90
0.0044334 Eth
$6,677,291.00
517,456.540 LINK
2.1548%
14
OKX
LINK-USDT$12.90
0.0044340 Eth
$5,993,874.00
476,520.486 LINK
1.9843%
15
Bitunix
LINK-USDT$12.95
0.0044406 Eth
$5,683,701.00
438,881.110 LINK
1.8276%
16
DigiFinex
LINK-USDT$12.90
0.0044326 Eth
$5,611,260.00
435,145.490 LINK
1.8120%
17
Ourbit
LINK-USDT$12.89
0.0044322 Eth
$4,936,609.00
392,936.100 LINK
1.6362%
18
Azbit
LINK-USDT$12.93
0.0044419 Eth
$4,754,282.00
379,944.410 LINK
1.5821%
19
Upbit
LINK-KRW$12.87
0.0044245 Eth
$4,740,233.00
368,273.863 LINK
1.5335%
20
XT.COM
LINK-USDT$12.91
0.0044369 Eth
$4,377,866.00
347,807.620 LINK
1.4483%
21
CoinW
LINK-USDT$12.91
0.0044371 Eth
$4,365,624.00
338,177.670 LINK
1.4082%
22
Biconomy.com
LINK-USDT$12.99
0.0044506 Eth
$3,941,585.00
313,570.850 LINK
1.3058%
23
Binance
LINK-FDUSD$12.91
0.0044273 Eth
$3,605,042.00
285,840.220 LINK
1.1903%
24
Coinstore
LINK-USDT$12.93
0.0044433 Eth
$3,156,835.00
250,612.800 LINK
1.0436%
25
KuCoin
LINK-USDT$12.89
0.0044342 Eth
$2,512,588.00
194,854.997 LINK
0.8114%
26
ProBit Global
LINK-USDT$12.95
0.0044375 Eth
$2,439,847.00
188,455.713 LINK
0.7848%
27
LBank
LINK-USDT$12.89
0.0044309 Eth
$2,417,896.00
187,577.180 LINK
0.7811%
28
BYDFi
LINK-USDT$12.91
0.0044276 Eth
$2,186,494.00
169,331.010 LINK
0.7051%
29
LATOKEN
LINK-USDT$12.93
0.0044437 Eth
$2,109,351.00
163,082.674 LINK
0.6791%
30
WhiteBIT
LINK-BTC$12.99
0.0044520 Eth
$1,923,875.00
148,087.350 LINK
0.6167%
31
Trubit
LINK-USDT$12.94
0.0044455 Eth
$1,841,589.00
146,549.070 LINK
0.6103%
32
AscendEX (BitMax)
LINK-USDT$12.87
0.0044244 Eth
$1,804,428.00
140,252.700 LINK
0.5840%
33
Bitvavo
LINK-EUR$12.92
0.0044391 Eth
$1,508,898.00
116,789.529 LINK
0.4863%
34
Binance
LINK-USDC$12.93
0.0044434 Eth
$1,494,403.00
118,950.320 LINK
0.4953%
35
Dex-Trade
LINK-USDT$12.95
0.0044374 Eth
$1,482,395.00
114,507.040 LINK
0.4768%
36
Bithumb
LINK-KRW$12.87
0.0044222 Eth
$1,293,548.00
100,497.141 LINK
0.4185%
37
HashKey Global
LINK-USDT$12.94
0.0044468 Eth
$1,102,115.00
88,070.515 LINK
0.3667%
38
Azbit
LINK-ETH$12.90
0.0044228 Eth
$949,774.00
74,559.772 LINK
0.3105%
39
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$12.84
0.0044165 Eth
$885,554.00
69,729.200 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.2904%
40
CoinEx
LINK-USDT$12.94
0.0044448 Eth
$884,685.00
70,223.944 LINK
0.2924%
41
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$12.94
0.0044512 Eth
$880,124.00
68,818.550 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.2866%
42
BigONE
LINK-USDT$12.84
0.0044121 Eth
$824,576.00
64,242.460 LINK
0.2675%
43
tanX
LINK-USDC$12.90
0.0044195 Eth
$725,099.00
57,771.130 LINK
0.2406%
44
WhiteBIT
LINK-TRY$12.91
0.0044346 Eth
$721,678.00
55,911.590 LINK
0.2328%
45
AscendEX (BitMax)
LINK-BTC$12.98
0.0044643 Eth
$671,230.00
51,706.400 LINK
0.2153%
46
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$12.85
0.0044205 Eth
$622,487.00
48,885.419 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.2036%
47
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$12.93
0.0044466 Eth
$570,632.00
44,868.765 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1868%
48
itBit
LINK-USD$12.90
0.0044324 Eth
$492,251.00
38,159.012 LINK
0.1589%
49
ProBit Global
LINK-BTC$12.94
0.0044455 Eth
$482,162.00
37,262.854 LINK
0.1552%
50
PointPay
LINK-USDT$12.89
0.0044320 Eth
$475,246.00
37,803.083 LINK
0.1574%
51
Phemex
LINK-USDT$12.90
0.0044343 Eth
$473,138.00
36,676.990 LINK
0.1527%
52
LATOKEN
LINK-BTC$12.93
0.0044431 Eth
$403,325.00
31,187.294 LINK
0.1299%
53
KickEX
LINK-USDT$12.97
0.0044430 Eth
$393,165.00
30,324.112 LINK
0.1263%
54
EXMO
LINK-USDT$12.89
0.0044341 Eth
$382,662.00
29,676.737 LINK
0.1236%
55
WhiteBIT
LINK-EUR$12.92
0.0044392 Eth
$360,465.00
27,897.870 LINK
0.1162%
56
Coinbase Exchange
LINK-EUR$12.90
0.0044358 Eth
$338,754.00
26,261.360 LINK
0.1094%
57
Binance
LINK-EUR$12.95
0.0044449 Eth
$286,664.00
22,784.800 LINK
0.0949%
58
Bybit
LINK-USDC$12.92
0.0044428 Eth
$285,867.00
22,716.722 LINK
0.0946%
59
EarnBIT
LINK-USDT$12.93
0.0044438 Eth
$278,154.00
22,065.320 LINK
0.0919%
60
Kraken
LINK-XBT$12.93
0.0044469 Eth
$261,048.00
20,186.815 LINK
0.0841%
61
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$12.90
0.0044378 Eth
$259,538.00
20,578.491 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0857%
62
BYDFi
LINK-USDC$12.93
0.0044409 Eth
$247,841.00
19,175.220 LINK
0.0798%
63
BitMart
LINK-BTC$12.93
0.0044455 Eth
$216,471.00
16,738.260 LINK
0.0697%
64
Slex
LINK-ETH$12.94
0.0044470 Eth
$216,112.00
17,003.130 LINK
0.0708%
65
Gemini
LINK-USD$12.91
0.0044410 Eth
$213,934.00
16,566.208 LINK
0.0690%
66
Coinbase Exchange
LINK-GBP$12.92
0.0044429 Eth
$207,920.00
16,092.860 LINK
0.0670%
67
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$12.94
0.0044509 Eth
$201,757.00
15,977.302 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0665%
68
GMO Japan
LINK-JPY$12.97
0.0044585 Eth
$190,393.00
14,679.100 LINK
0.0611%
69
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$12.90
0.0044352 Eth
$180,463.00
176,057.806 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.7331%
70
BitDelta
LINK-USDT$12.93
0.0044437 Eth
$174,748.00
13,932.000 LINK
0.0580%
71
Bitkub
LINK-THB$12.94
0.0044465 Eth
$155,666.00
12,028.819 LINK
0.0501%
72
OKX
LINK-USDC$12.93
0.0044445 Eth
$153,348.00
12,224.750 LINK
0.0509%
73
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$12.85
0.0044188 Eth
$140,893.00
11,062.605 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0461%
74
Kraken
LINK-AUD$12.93
0.0044458 Eth
$131,840.00
10,197.639 LINK
0.0425%
75
Bitci TR
LINK-TRY$12.88
0.0044207 Eth
$128,160.00
10,219.690 LINK
0.0426%
76
Slex
LINK-BTC$12.96
0.0044401 Eth
$116,315.00
9,195.100 LINK
0.0383%
77
Coinbase Exchange
LINK-ETH$12.95
0.0044511 Eth
$92,701.00
7,155.730 LINK
0.0298%
78
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$12.86
0.0044170 Eth
$89,294.00
86,217.393 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.3590%
79
Bitso
LINK-USD$12.91
0.0044344 Eth
$80,622.00
6,245.578 LINK
0.0260%
80
PointPay
LINK-BTC$12.92
0.0044427 Eth
$80,546.00
6,378.446 LINK
0.0266%
81
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$12.84
0.0044165 Eth
$78,632.00
6,357.608 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0265%
82
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$12.95
0.0044416 Eth
$73,369.00
5,824.064 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0243%
83
Coinbase Exchange
LINK-BTC$12.96
0.0044507 Eth
$66,809.00
5,156.540 LINK
0.0215%
84
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$12.84
0.0044165 Eth
$60,816.00
59,732.440 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.2487%
85
Kanga
LINK-PLN$12.97
0.0044583 Eth
$56,504.00
0.000 LINK
0.0000%
86
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$12.96
0.0044515 Eth
$56,440.00
4,418.201 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0184%
87
Mercado Bitcoin
LINK-BRL$12.96
0.0044525 Eth
$55,371.00
4,273.020 LINK
0.0178%
88
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$12.93
0.0044459 Eth
$51,551.00
4,090.465 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0170%
89
Uniswap V3 (Ethereum)
0XA95C5EBB86E0DE73B4FB8C47A45B792CFEA28C23-0X514910771AF9CA656AF840DFF83E8264ECF986CA$12.91
0.0044403 Eth
$46,112.00
141,453.663 0XA95C5EBB86E0DE73B4FB8C47A45B792CFEA28C23
0.5890%
90
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$12.97
0.0044588 Eth
$46,075.00
3,631.586 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0151%
91
Bitcointry
LINK-USDT$12.90
0.0044372 Eth
$44,598.00
3,538.304 LINK
0.0147%
92
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$12.90
0.0044365 Eth
$38,716.00
37,637.702 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.1567%
93
KuCoin
LINK-USDC$12.93
0.0044461 Eth
$35,424.00
2,739.857 LINK
0.0114%
94
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$12.84
0.0044160 Eth
$32,211.00
2,534.578 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0106%
95
Coinone
LINK-KRW$12.89
0.0044319 Eth
$31,449.00
2,439.197 LINK
0.0102%
96
Binance US
LINK-USDT$12.93
0.0044437 Eth
$29,553.00
2,284.855 LINK
0.0095%
97
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$12.95
0.0044535 Eth
$27,068.00
2,119.274 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0088%
98
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$12.92
0.0044375 Eth
$25,454.00
2,009.211 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0084%
99
KuCoin
LINK-BTC$12.94
0.0044485 Eth
$24,750.00
1,913.262 LINK
0.0080%
100
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$12.94
0.0044446 Eth
$23,982.00
1,908.065 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0079%

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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