ETH Price: $3,270.29 (-0.65%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

727,197 ( 0.010%)

Market

Price

$23.33 @ 0.007134 ETH (-1.81%)

Onchain Market Cap

$23,330,000,000.00

Circulating Supply Market Cap

$14,749,521,632.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
480.2141476 LINK

Value
$11,203.40 ( ~3.4258 Eth) [0.0000%]
0xb8720e1e1445af41b170f2305cbc8b28e2cff10e
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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 21109.09% |ETH 0.0003846 1754.91%

Market

Volume (24H):$1,056,475,087.00
Market Capitalization:$14,749,521,632.00
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$23.25
0.0071221 Eth
$147,867,791.00
6,177,826.460 LINK
21.8847%
2
Coinbase Exchange
LINK-USD$23.23
0.0071092 Eth
$73,373,852.00
3,158,445.700 LINK
11.1887%
3
Bybit
LINK-USDT$23.25
0.0071216 Eth
$42,685,447.00
1,783,981.639 LINK
6.3197%
4
P2B
LINK-USDT$23.23
0.0071168 Eth
$29,157,601.00
1,255,062.330 LINK
4.4460%
5
Slex
LINK-USDT$23.40
0.0071329 Eth
$24,313,518.00
1,017,431.320 LINK
3.6042%
6
OKX
LINK-USDT$23.23
0.0071174 Eth
$19,749,060.00
825,325.322 LINK
2.9237%
7
HTX
LINK-USDT$23.25
0.0071225 Eth
$18,290,389.00
765,115.069 LINK
2.7104%
8
DigiFinex
LINK-USDT$23.23
0.0071155 Eth
$18,026,135.00
775,973.820 LINK
2.7489%
9
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$23.17
0.0071042 Eth
$15,995,609.00
672,977.141 0X514910771AF9CA656AF840DFF83E8264ECF986CA
2.3840%
10
XT.COM
LINK-USDT$23.26
0.0071163 Eth
$14,800,502.00
618,821.620 LINK
2.1921%
11
Azbit
LINK-USDT$23.24
0.0071236 Eth
$14,653,433.00
612,353.154 LINK
2.1692%
12
Binance
LINK-FDUSD$23.37
0.0071434 Eth
$14,320,468.00
599,648.190 LINK
2.1242%
13
MEXC
LINK-USDT$23.20
0.0071119 Eth
$13,023,297.00
561,319.000 LINK
1.9884%
14
Coinstore
LINK-USDT$23.22
0.0071114 Eth
$12,985,532.00
542,660.590 LINK
1.9224%
15
Bitunix
LINK-USDT$23.24
0.0071183 Eth
$10,871,334.00
467,946.660 LINK
1.6577%
16
CoinW
LINK-USDT$23.32
0.0071251 Eth
$9,720,010.00
416,860.990 LINK
1.4767%
17
Kraken
LINK-USD$23.21
0.0071111 Eth
$8,941,502.00
385,182.457 LINK
1.3645%
18
KuCoin
LINK-USDT$23.24
0.0071177 Eth
$8,697,740.00
374,293.933 LINK
1.3259%
19
BTSE
LINK-USDT$23.19
0.0071093 Eth
$8,146,583.00
351,328.876 LINK
1.2446%
20
BYDFi
LINK-USDT$23.27
0.0071156 Eth
$8,042,875.00
345,685.930 LINK
1.2246%
21
Binance
LINK-USDC$23.39
0.0071320 Eth
$7,426,786.00
310,548.690 LINK
1.1001%
22
LATOKEN
LINK-USDT$23.20
0.0071113 Eth
$7,345,593.00
316,676.456 LINK
1.1218%
23
LBank
LINK-USDT$23.18
0.0071061 Eth
$7,075,733.00
305,262.630 LINK
1.0814%
24
Hotcoin
LINK-USDT$23.25
0.0071229 Eth
$6,317,958.00
271,717.220 LINK
0.9625%
25
QMall
LINK-USDT$23.20
0.0071107 Eth
$5,680,680.00
237,431.145 LINK
0.8411%
26
Coinbase Exchange
LINK-USDT$23.26
0.0071252 Eth
$5,260,424.00
226,137.204 LINK
0.8011%
27
Coinbase Exchange
LINK-EUR$23.20
0.0071069 Eth
$4,931,947.00
212,584.590 LINK
0.7531%
28
Dex-Trade
LINK-USDT$23.24
0.0071198 Eth
$4,532,208.00
195,000.970 LINK
0.6908%
29
FMCPAY
LINK-USDT$23.25
0.0071225 Eth
$3,714,575.00
155,578.592 LINK
0.5511%
30
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$23.35
0.0071403 Eth
$3,650,414.00
153,455.477 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.5436%
31
Bitvavo
LINK-EUR$23.25
0.0071250 Eth
$3,586,013.00
154,262.725 LINK
0.5465%
32
CoinEx
LINK-USDT$23.23
0.0071143 Eth
$2,769,992.00
116,169.749 LINK
0.4115%
33
Biconomy.com
LINK-USDT$23.19
0.0071110 Eth
$2,545,050.00
106,529.760 LINK
0.3774%
34
Coinbase Exchange
LINK-ETH$23.21
0.0071144 Eth
$2,400,452.00
103,440.460 LINK
0.3664%
35
PointPay
LINK-USDT$23.23
0.0071154 Eth
$2,070,859.00
86,632.978 LINK
0.3069%
36
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$23.41
0.0071611 Eth
$1,778,833.00
75,558.986 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.2677%
37
FMCPAY
LINK-ETH$23.24
0.0071198 Eth
$1,763,827.00
74,238.080 LINK
0.2630%
38
FMCPAY
LINK-BTC$23.22
0.0071195 Eth
$1,694,111.00
70,529.000 LINK
0.2498%
39
AscendEX (BitMax)
LINK-USDT$23.29
0.0071334 Eth
$1,686,301.00
72,416.300 LINK
0.2565%
40
Coinbase Exchange
LINK-GBP$23.14
0.0070900 Eth
$1,666,897.00
72,021.350 LINK
0.2551%
41
Phemex
LINK-USDT$23.39
0.0071501 Eth
$1,639,189.00
70,077.880 LINK
0.2482%
42
EXMO
LINK-USDT$23.29
0.0071345 Eth
$1,362,536.00
58,503.288 LINK
0.2072%
43
Kraken
LINK-EUR$23.13
0.0070868 Eth
$1,311,874.00
56,706.932 LINK
0.2009%
44
Binance
LINK-ETH$23.35
0.0071349 Eth
$1,191,011.00
49,910.020 LINK
0.1768%
45
tanX
LINK-USDC$23.36
0.0071431 Eth
$1,182,067.00
49,414.830 LINK
0.1750%
46
Bitbank
LINK-JPY$23.26
0.0071264 Eth
$1,140,894.00
49,042.307 LINK
0.1737%
47
BitStorage
LINK-USDT$23.38
0.0071480 Eth
$1,130,831.00
48,367.930 LINK
0.1713%
48
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$23.41
0.0071587 Eth
$1,079,221.00
45,188.720 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1601%
49
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$23.28
0.0071199 Eth
$1,063,369.00
44,562.799 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.1579%
50
Tokpie
LINK-USDT$23.16
0.0070804 Eth
$1,059,314.00
45,736.259 LINK
0.1620%
51
Kraken
LINK-USDT$23.31
0.0071414 Eth
$1,038,160.00
44,532.600 LINK
0.1578%
52
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$23.31
0.0071473 Eth
$974,536.00
1,002,510.920 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
3.5513%
53
Binance
LINK-TRY$23.59
0.0072117 Eth
$956,400.00
39,651.300 LINK
0.1405%
54
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$23.41
0.0071602 Eth
$947,578.00
39,714.136 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.1407%
55
EarnBIT
LINK-USDT$23.19
0.0071012 Eth
$901,715.00
37,784.250 LINK
0.1338%
56
Nonkyc.io
LINK-USDT$23.38
0.0071552 Eth
$896,866.00
37,461.165 LINK
0.1327%
57
Trubit
LINK-USDT$23.23
0.0071148 Eth
$878,400.00
36,802.220 LINK
0.1304%
58
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$23.45
0.0071724 Eth
$875,512.00
63,315.226 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.2243%
59
Binance
LINK-EUR$23.37
0.0071455 Eth
$855,343.00
35,878.310 LINK
0.1271%
60
BigONE
LINK-USDT$23.22
0.0071180 Eth
$853,174.00
36,748.540 LINK
0.1302%
61
Gemini
LINK-USD$23.29
0.0071354 Eth
$806,581.00
34,627.777 LINK
0.1227%
62
Bybit
LINK-USDC$23.24
0.0071198 Eth
$787,092.00
32,921.231 LINK
0.1166%
63
LATOKEN
LINK-BTC$23.23
0.0071165 Eth
$740,996.00
31,893.393 LINK
0.1130%
64
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$23.41
0.0071611 Eth
$642,291.00
658,040.493 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
2.3311%
65
QMall
LINK-USDC$23.37
0.0071441 Eth
$616,031.00
25,736.503 LINK
0.0912%
66
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$23.38
0.0071660 Eth
$581,599.00
24,420.878 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0865%
67
itBit
LINK-USD$23.27
0.0071284 Eth
$561,956.00
24,149.356 LINK
0.0855%
68
Kraken
LINK-ETH$23.34
0.0071497 Eth
$540,928.00
23,176.319 LINK
0.0821%
69
Bitbegin
LINK-USDT$23.21
0.0071145 Eth
$457,602.00
19,154.239 LINK
0.0679%
70
Coinbase Exchange
LINK-BTC$23.20
0.0071110 Eth
$417,211.00
17,986.180 LINK
0.0637%
71
Slex
LINK-BTC$23.27
0.0071258 Eth
$409,331.00
17,022.600 LINK
0.0603%
72
GMO Japan
LINK-JPY$23.39
0.0071718 Eth
$407,235.00
17,408.300 LINK
0.0617%
73
OKX
LINK-USDC$23.16
0.0070934 Eth
$341,139.00
14,273.704 LINK
0.0506%
74
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$23.16
0.0070996 Eth
$336,245.00
14,148.631 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0501%
75
DeGate
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$23.19
0.0071073 Eth
$327,644.00
13,683.290 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0485%
76
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$23.37
0.0071488 Eth
$316,062.00
13,259.519 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0470%
77
BitDelta
LINK-USDT$23.22
0.0071123 Eth
$315,647.00
13,208.000 LINK
0.0468%
78
Slex
LINK-ETH$23.36
0.0071394 Eth
$301,740.00
12,658.540 LINK
0.0448%
79
Bitget
LINK-EUR$23.14
0.0070873 Eth
$301,739.00
12,654.600 LINK
0.0448%
80
PointPay
LINK-BTC$23.33
0.0071355 Eth
$299,745.00
12,469.346 LINK
0.0442%
81
BitMart
LINK-BTC$23.20
0.0071118 Eth
$281,580.00
12,136.660 LINK
0.0430%
82
BitStorage
LINK-ETH$23.35
0.0071403 Eth
$240,745.00
10,311.540 LINK
0.0365%
83
Hotcoin
LINK-BTC$23.24
0.0071205 Eth
$224,504.00
9,658.510 LINK
0.0342%
84
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$23.40
0.0071569 Eth
$194,559.00
8,163.080 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0289%
85
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$23.41
0.0071611 Eth
$193,821.00
8,095.544 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0287%
86
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$23.21
0.0071000 Eth
$190,528.00
7,953.124 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0282%
87
BYDFi
LINK-USDC$23.37
0.0071327 Eth
$186,187.00
7,966.380 LINK
0.0282%
88
Uniswap V2 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$23.18
0.0071073 Eth
$179,769.00
7,570.388 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0268%
89
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$23.41
0.0071584 Eth
$165,625.00
6,863.950 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0243%
90
KuCoin
LINK-USDC$23.16
0.0070945 Eth
$165,590.00
7,149.255 LINK
0.0253%
91
Bitkub
LINK-THB$23.41
0.0071752 Eth
$164,784.00
7,039.732 LINK
0.0249%
92
Bitcointry
LINK-USDT$23.21
0.0071144 Eth
$148,944.00
6,257.976 LINK
0.0222%
93
Kraken
LINK-GBP$23.32
0.0071429 Eth
$148,360.00
6,362.680 LINK
0.0225%
94
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$23.35
0.0071403 Eth
$142,890.00
146,543.568 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.5191%
95
Binance US
LINK-USDT$23.30
0.0071256 Eth
$140,164.00
6,015.418 LINK
0.0213%
96
PancakeSwap (v2)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$23.38
0.0071611 Eth
$125,594.00
5,203.140 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0184%
97
Bitso
LINK-USD$23.37
0.0071411 Eth
$110,038.00
4,708.805 LINK
0.0167%
98
Mercado Bitcoin
LINK-BRL$23.25
0.0071219 Eth
$102,001.00
4,387.354 LINK
0.0155%
99
BitMart
LINK-ETH$23.20
0.0071110 Eth
$100,139.00
4,316.640 LINK
0.0153%
100
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$23.26
0.0071136 Eth
$73,139.00
3,071.650 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0109%

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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