ETH Price: $2,478.52 (+1.33%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

721,665 ( 0.004%)

Market

Price

$11.05 @ 0.004458 ETH (+0.99%)

Onchain Market Cap

$11,050,000,000.00

Circulating Supply Market Cap

$6,926,661,028.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
516.64046613 LINK

Value
$5,708.88 ( ~2.3033 Eth) [0.0001%]
0x8d479f0aad29788F71439db5ce66E39fC7A2FC0b
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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 9945.45% |ETH 0.0003846 1059.13%

Market

Volume (24H):$287,331,266.00
Market Capitalization:$6,926,661,028.00
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
LBank
LINK-USDT$11.05
0.0044538 Eth
$34,287,475.00
3,103,484.030 LINK
21.7571%
2
Binance
LINK-USDT$11.08
0.0044656 Eth
$15,118,161.00
1,372,450.330 LINK
9.6216%
3
Coinbase Exchange
LINK-USD$11.07
0.0044674 Eth
$10,641,109.00
960,909.280 LINK
6.7365%
4
HTX
LINK-USDT$11.08
0.0044656 Eth
$8,833,914.00
803,484.633 LINK
5.6329%
5
Bitget
LINK-USDT$11.07
0.0044630 Eth
$8,716,708.00
792,335.807 LINK
5.5547%
6
Websea
LINK-USDT$11.07
0.0044669 Eth
$6,691,161.00
0.000 LINK
0.0000%
7
Bybit
LINK-USDT$11.08
0.0044678 Eth
$6,281,079.00
570,049.335 LINK
3.9964%
8
Azbit
LINK-USDT$11.07
0.0044627 Eth
$5,327,588.00
484,698.560 LINK
3.3980%
9
WhiteBIT
LINK-USDT$11.06
0.0044601 Eth
$4,618,491.00
417,431.560 LINK
2.9264%
10
Poloniex
LINK-USDT$11.11
0.0044839 Eth
$3,775,252.00
343,083.620 LINK
2.4052%
11
BVOX
LINK-USDT$11.07
0.0044666 Eth
$3,221,653.00
292,772.820 LINK
2.0525%
12
P2B
LINK-USDT$11.07
0.0044621 Eth
$3,200,453.00
289,140.070 LINK
2.0270%
13
Biconomy.com
LINK-USDT$11.08
0.0044655 Eth
$3,169,215.00
288,209.600 LINK
2.0205%
14
WEEX
LINK-USDT$11.05
0.0044655 Eth
$3,086,966.00
280,300.420 LINK
1.9651%
15
Slex
LINK-USDT$11.09
0.0044730 Eth
$2,635,757.00
239,308.530 LINK
1.6777%
16
FameEX
LINK-USDT$11.08
0.0044684 Eth
$2,439,890.00
221,917.451 LINK
1.5558%
17
BTSE
LINK-USDT$11.07
0.0044649 Eth
$2,343,995.00
211,790.931 LINK
1.4848%
18
KuCoin
LINK-USDT$11.07
0.0044637 Eth
$1,886,758.00
170,393.192 LINK
1.1946%
19
DigiFinex
LINK-USDT$11.08
0.0044664 Eth
$1,879,636.00
169,653.030 LINK
1.1894%
20
OKX
LINK-USDT$11.08
0.0044647 Eth
$1,814,488.00
164,888.253 LINK
1.1560%
21
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$11.06
0.0044624 Eth
$1,760,031.00
158,280.214 0X514910771AF9CA656AF840DFF83E8264ECF986CA
1.1096%
22
AscendEX (BitMax)
LINK-USDT$11.06
0.0044569 Eth
$1,720,827.00
155,645.500 LINK
1.0912%
23
Upbit
LINK-KRW$11.06
0.0044599 Eth
$1,697,868.00
153,447.224 LINK
1.0758%
24
Deepcoin
LINK-USDT$11.06
0.0044649 Eth
$1,565,474.00
148,843.020 LINK
1.0435%
25
Trubit
LINK-USDT$11.06
0.0044631 Eth
$1,545,635.00
140,335.960 LINK
0.9838%
26
XT.COM
LINK-USDT$11.07
0.0044649 Eth
$1,374,122.00
124,728.310 LINK
0.8744%
27
CoinW
LINK-USDT$11.08
0.0044672 Eth
$1,308,900.00
118,157.900 LINK
0.8284%
28
Toobit
LINK-USDT$11.07
0.0044650 Eth
$1,268,696.00
115,224.220 LINK
0.8078%
29
C-Patex
LINK-USDT$11.07
0.0044657 Eth
$1,092,167.00
98,625.645 LINK
0.6914%
30
Binance
LINK-BTC$11.07
0.0044677 Eth
$1,067,527.00
96,509.930 LINK
0.6766%
31
HashKey Global
LINK-USDT$11.08
0.0044716 Eth
$996,911.00
90,985.150 LINK
0.6379%
32
Crypto.com Exchange
LINK-USDT$11.08
0.0044651 Eth
$986,531.00
89,066.880 LINK
0.6244%
33
Gate.io
LINK-USDT$11.08
0.0044656 Eth
$974,381.00
88,499.170 LINK
0.6204%
34
Azbit
LINK-ETH$11.08
0.0044666 Eth
$930,428.00
83,664.647 LINK
0.5865%
35
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$11.05
0.0044564 Eth
$920,413.00
83,194.865 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.5832%
36
Bitunix
LINK-USDT$11.07
0.0044664 Eth
$844,443.00
76,246.220 LINK
0.5345%
37
MEXC
LINK-USDT$11.08
0.0044660 Eth
$837,557.00
75,603.390 LINK
0.5300%
38
BYDFi
LINK-USDT$11.06
0.0044682 Eth
$757,174.00
68,474.080 LINK
0.4800%
39
Kraken
LINK-USD$11.06
0.0044585 Eth
$752,588.00
68,045.882 LINK
0.4770%
40
FMCPAY
LINK-USDT$11.07
0.0044649 Eth
$741,753.00
67,410.465 LINK
0.4726%
41
Hotcoin
LINK-USDT$11.09
0.0044701 Eth
$675,074.00
60,878.510 LINK
0.4268%
42
FMFW.io
LINK-USDT$11.08
0.0044648 Eth
$659,446.00
59,532.700 LINK
0.4174%
43
HitBTC
LINK-USDT$11.07
0.0044639 Eth
$643,014.00
58,414.020 LINK
0.4095%
44
Bitvavo
LINK-EUR$11.04
0.0044569 Eth
$600,942.00
54,430.666 LINK
0.3816%
45
LATOKEN
LINK-USDT$11.08
0.0044659 Eth
$463,036.00
41,797.600 LINK
0.2930%
46
Crypto.com Exchange
LINK-USD$11.08
0.0044654 Eth
$453,974.00
40,983.490 LINK
0.2873%
47
FMCPAY
LINK-BTC$11.06
0.0044618 Eth
$442,506.00
40,074.400 LINK
0.2809%
48
tanX
LINK-USDC$11.05
0.0044742 Eth
$431,612.00
39,213.890 LINK
0.2749%
49
CoinEx
LINK-USDT$11.07
0.0044635 Eth
$416,533.00
37,773.851 LINK
0.2648%
50
WhiteBIT
LINK-BTC$11.08
0.0044655 Eth
$414,819.00
37,447.290 LINK
0.2625%
51
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$11.07
0.0044636 Eth
$362,696.00
33,080.853 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.2319%
52
FMCPAY
LINK-ETH$11.06
0.0044618 Eth
$362,321.00
32,641.280 LINK
0.2288%
53
Bithumb
LINK-KRW$11.04
0.0044516 Eth
$336,817.00
30,501.624 LINK
0.2138%
54
BigONE
LINK-USDT$11.11
0.0044809 Eth
$292,389.00
26,323.690 LINK
0.1845%
55
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$11.04
0.0044523 Eth
$280,277.00
25,298.695 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1774%
56
PointPay
LINK-USDT$11.06
0.0044651 Eth
$247,721.00
22,478.781 LINK
0.1576%
57
EXMO
LINK-USDT$11.07
0.0044632 Eth
$211,270.00
19,082.014 LINK
0.1338%
58
LATOKEN
LINK-BTC$11.08
0.0044661 Eth
$209,140.00
18,878.043 LINK
0.1323%
59
Pionex
LINK-USDT$11.08
0.0044677 Eth
$192,446.00
17,468.990 LINK
0.1225%
60
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$11.06
0.0044568 Eth
$189,429.00
17,071.969 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.1197%
61
BitMart
LINK-BTC$11.07
0.0044637 Eth
$182,296.00
16,463.140 LINK
0.1154%
62
Phemex
LINK-USDT$11.06
0.0044646 Eth
$156,676.00
14,164.640 LINK
0.0993%
63
Koinpark
LINK-USDT$11.07
0.0044643 Eth
$142,719.00
12,898.019 LINK
0.0904%
64
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$11.05
0.0044562 Eth
$130,175.00
11,718.573 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0822%
65
Bitbank
LINK-JPY$11.06
0.0044595 Eth
$126,386.00
11,424.619 LINK
0.0801%
66
Nominex
LINK-USDT$11.06
0.0044648 Eth
$123,907.00
11,205.627 LINK
0.0786%
67
Hotcoin
LINK-ETH$11.07
0.0044638 Eth
$121,926.00
11,011.010 LINK
0.0772%
68
Bybit
LINK-USDC$11.06
0.0044576 Eth
$114,085.00
10,367.100 LINK
0.0727%
69
BitDelta
LINK-USDT$11.08
0.0044690 Eth
$106,044.00
9,642.000 LINK
0.0676%
70
Kraken
LINK-EUR$11.06
0.0044574 Eth
$103,317.00
9,343.788 LINK
0.0655%
71
Bitci TR
LINK-TRY$11.14
0.0044894 Eth
$103,309.00
9,373.970 LINK
0.0657%
72
Bit2Me
LINK-EUR$11.06
0.0044591 Eth
$102,094.00
9,284.298 LINK
0.0651%
73
Hotcoin
LINK-BTC$11.07
0.0044637 Eth
$100,328.00
9,060.600 LINK
0.0635%
74
BYDFi
LINK-USDC$11.06
0.0044676 Eth
$74,287.00
6,719.060 LINK
0.0471%
75
Slex
LINK-ETH$11.06
0.0044638 Eth
$74,280.00
6,693.750 LINK
0.0469%
76
Slex
LINK-BTC$11.07
0.0044651 Eth
$67,890.00
6,143.300 LINK
0.0431%
77
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$11.11
0.0044822 Eth
$65,585.00
5,956.354 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0418%
78
Bitget
LINK-EUR$11.06
0.0044567 Eth
$48,914.00
4,448.630 LINK
0.0312%
79
Bitso
LINK-USD$11.07
0.0044638 Eth
$34,389.00
3,105.615 LINK
0.0218%
80
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$11.05
0.0044601 Eth
$32,799.00
32,643.079 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.2288%
81
EXMO
LINK-BTC$11.09
0.0044739 Eth
$26,953.00
2,429.476 LINK
0.0170%
82
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$11.04
0.0044551 Eth
$24,874.00
24,690.433 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.1731%
83
CoinEx
LINK-USDC$11.01
0.0044393 Eth
$24,220.00
2,185.272 LINK
0.0153%
84
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$11.09
0.0044692 Eth
$22,320.00
2,003.652 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0140%
85
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$11.03
0.0044465 Eth
$19,460.62
1,772.621 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0124%
86
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$11.05
0.0044562 Eth
$17,961.32
1,634.068 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0115%
87
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$11.06
0.0044614 Eth
$13,380.56
13,280.219 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.0931%
88
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$11.07
0.0044619 Eth
$12,807.36
1,162.256 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0081%
89
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$11.09
0.0044706 Eth
$12,084.38
1,102.717 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0077%
90
Coinone
LINK-KRW$11.01
0.0044396 Eth
$11,508.85
1,045.028 LINK
0.0073%
91
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$11.10
0.0044813 Eth
$9,505.90
853.878 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0060%
92
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$11.06
0.0044568 Eth
$8,350.91
8,320.299 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.0583%
93
TokoCrypto
LINK-USDT$11.07
0.0044640 Eth
$4,543.03
410.455 LINK
0.0029%
94
CoinEx
LINK-BTC$11.05
0.0044579 Eth
$3,990.31
361.148 LINK
0.0025%
95
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$11.06
0.0044643 Eth
$3,571.52
324.367 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0023%
96
PancakeSwap V3 (Arbitrum)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$11.06
0.0044590 Eth
$1,175.14
105.938 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0007%
97
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X61299774020DA444AF134C82FA83E3810B309991$11.05
0.0044601 Eth
$1,131.28
103.195 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0007%
98
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$11.06
0.0044604 Eth
$540.07
49.025 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0003%
99
CEX.IO
LINK-USDT$11.08
0.0044673 Eth
$291.42
26.656 LINK
0.0002%
100
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$11.09
0.0044688 Eth
$197.09
17.910 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0001%

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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