ETH Price: $2,701.12 (+1.08%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

736,490 ( 0.006%)

Market

Price

$17.92 @ 0.006634 ETH (-1.68%)

Onchain Market Cap

$17,920,000,000.00

Circulating Supply Market Cap

$11,440,524,687.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
0 LINK

Value
$0.00
0xdb5dc2d8317d03ee5286da704198a413c4684e89
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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 16190.91% |ETH 0.0003846 1624.91%

Market

Volume (24H):$643,632,452.00
Market Capitalization:$11,440,524,687.00
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$17.95
0.0066319 Eth
$73,312,017.00
4,121,872.070 LINK
16.9709%
2
MEXC
LINK-USDT$17.93
0.0066276 Eth
$41,838,731.00
2,332,930.090 LINK
9.6054%
3
Coinbase Exchange
LINK-USD$17.93
0.0066344 Eth
$28,833,696.00
1,607,856.820 LINK
6.6200%
4
Bybit
LINK-USDT$17.89
0.0066147 Eth
$24,972,853.00
1,403,761.375 LINK
5.7797%
5
HTX
LINK-USDT$17.89
0.0066180 Eth
$20,449,040.00
1,148,871.376 LINK
4.7302%
6
P2B
LINK-USDT$17.89
0.0066230 Eth
$14,610,768.00
816,472.420 LINK
3.3617%
7
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$18.00
0.0066575 Eth
$11,570,439.00
641,511.923 0X514910771AF9CA656AF840DFF83E8264ECF986CA
2.6413%
8
Bitget
LINK-USDT$17.89
0.0066176 Eth
$11,392,297.00
640,553.190 LINK
2.6373%
9
Kraken
LINK-USD$17.89
0.0066173 Eth
$11,262,611.00
629,464.795 LINK
2.5917%
10
Slex
LINK-USDT$17.91
0.0066305 Eth
$10,980,659.00
616,144.080 LINK
2.5368%
11
Gate.io
LINK-USDT$17.89
0.0066177 Eth
$9,016,160.00
508,409.280 LINK
2.0933%
12
DigiFinex
LINK-USDT$17.90
0.0066175 Eth
$9,012,846.00
503,646.280 LINK
2.0737%
13
OKX
LINK-USDT$17.88
0.0066144 Eth
$8,655,101.00
486,708.931 LINK
2.0039%
14
KuCoin
LINK-USDT$17.91
0.0066235 Eth
$7,945,894.00
443,670.534 LINK
1.8267%
15
XT.COM
LINK-USDT$17.93
0.0066249 Eth
$7,270,675.00
408,711.100 LINK
1.6828%
16
MEXC
LINK-EUR$17.91
0.0066271 Eth
$7,059,120.00
394,225.260 LINK
1.6231%
17
MEXC
LINK-USDC$17.90
0.0066243 Eth
$6,713,063.00
375,014.240 LINK
1.5440%
18
Coinstore
LINK-USDT$17.95
0.0066322 Eth
$6,240,688.00
350,938.390 LINK
1.4449%
19
Binance
LINK-FDUSD$17.95
0.0066260 Eth
$6,229,590.00
348,677.470 LINK
1.4356%
20
CoinW
LINK-USDT$17.90
0.0066188 Eth
$5,770,508.00
322,420.930 LINK
1.3275%
21
Hotcoin
LINK-USDT$17.92
0.0066179 Eth
$5,593,162.00
312,144.940 LINK
1.2852%
22
Binance
LINK-USDC$17.90
0.0066192 Eth
$4,847,436.00
272,841.990 LINK
1.1234%
23
Azbit
LINK-USDT$17.97
0.0066290 Eth
$4,379,434.00
246,164.535 LINK
1.0135%
24
Bitunix
LINK-USDT$17.89
0.0066211 Eth
$4,270,582.00
238,649.410 LINK
0.9826%
25
BYDFi
LINK-USDT$17.89
0.0066176 Eth
$4,099,615.00
229,110.590 LINK
0.9433%
26
BTSE
LINK-USDT$17.89
0.0066226 Eth
$3,957,565.00
221,157.175 LINK
0.9106%
27
WhiteBIT
LINK-USDT$17.88
0.0066100 Eth
$3,921,689.00
219,374.630 LINK
0.9032%
28
LATOKEN
LINK-USDT$17.92
0.0066311 Eth
$3,395,706.00
189,448.395 LINK
0.7800%
29
Coinbase Exchange
LINK-GBP$17.89
0.0066166 Eth
$3,111,278.00
173,897.160 LINK
0.7160%
30
QMall
LINK-USDT$17.92
0.0066262 Eth
$2,928,482.00
164,772.944 LINK
0.6784%
31
Bitvavo
LINK-EUR$17.90
0.0066232 Eth
$2,641,580.00
147,591.250 LINK
0.6077%
32
Dex-Trade
LINK-USDT$17.95
0.0066372 Eth
$2,340,361.00
130,395.730 LINK
0.5369%
33
FMCPAY
LINK-USDT$17.92
0.0066203 Eth
$2,240,756.00
125,951.030 LINK
0.5186%
34
CoinEx
LINK-USDT$17.96
0.0066367 Eth
$2,114,667.00
118,583.861 LINK
0.4882%
35
Binance
LINK-BTC$17.97
0.0066326 Eth
$1,696,161.00
95,017.650 LINK
0.3912%
36
Biconomy.com
LINK-USDT$17.97
0.0066329 Eth
$1,472,848.00
82,707.580 LINK
0.3405%
37
Binance
LINK-ETH$17.94
0.0066345 Eth
$1,440,125.00
79,787.330 LINK
0.3285%
38
Coinbase Exchange
LINK-EUR$17.89
0.0066144 Eth
$1,281,065.00
71,626.210 LINK
0.2949%
39
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$17.94
0.0066340 Eth
$1,262,689.00
1,250,876.910 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
5.1502%
40
FMCPAY
LINK-ETH$17.93
0.0066321 Eth
$1,159,762.00
64,296.160 LINK
0.2647%
41
PointPay
LINK-USDT$17.88
0.0066193 Eth
$1,089,509.00
61,324.614 LINK
0.2525%
42
FMCPAY
LINK-BTC$17.91
0.0066233 Eth
$1,075,064.00
60,192.000 LINK
0.2478%
43
Phemex
LINK-USDT$17.93
0.0066347 Eth
$790,423.00
44,074.490 LINK
0.1815%
44
Trubit
LINK-USDT$17.92
0.0066293 Eth
$787,212.00
44,228.480 LINK
0.1821%
45
EXMO
LINK-USDT$17.90
0.0066185 Eth
$749,010.00
41,854.392 LINK
0.1723%
46
BigONE
LINK-USDT$17.84
0.0066033 Eth
$724,585.00
40,609.930 LINK
0.1672%
47
tanX
LINK-USDC$17.90
0.0066227 Eth
$704,285.00
39,538.670 LINK
0.1628%
48
LATOKEN
LINK-BTC$17.92
0.0066320 Eth
$643,048.00
35,874.694 LINK
0.1477%
49
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$17.93
0.0066297 Eth
$637,506.00
35,840.281 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1476%
50
WhiteBIT
LINK-BTC$17.88
0.0066149 Eth
$632,548.00
35,376.620 LINK
0.1457%
51
Bitbank
LINK-JPY$17.96
0.0066434 Eth
$632,175.00
35,190.995 LINK
0.1449%
52
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$17.91
0.0066232 Eth
$570,157.00
31,404.775 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1293%
53
OKX
LINK-USDC$17.88
0.0066133 Eth
$567,332.00
32,188.861 LINK
0.1325%
54
itBit
LINK-USD$17.94
0.0066345 Eth
$535,244.00
29,835.254 LINK
0.1228%
55
Gemini
LINK-USD$17.92
0.0066271 Eth
$528,759.00
29,508.118 LINK
0.1215%
56
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$17.83
0.0065940 Eth
$499,141.00
27,841.580 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1146%
57
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$17.90
0.0066180 Eth
$495,409.00
51,714.463 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.2129%
58
Binance
LINK-EUR$17.99
0.0066386 Eth
$490,600.00
27,499.810 LINK
0.1132%
59
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$17.83
0.0065940 Eth
$451,214.00
451,997.340 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
1.8610%
60
EarnBIT
LINK-USDT$17.92
0.0066267 Eth
$412,409.00
23,197.211 LINK
0.0955%
61
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$17.99
0.0066515 Eth
$398,594.00
22,365.840 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0921%
62
QMall
LINK-USDC$17.92
0.0066196 Eth
$386,318.00
21,759.120 LINK
0.0896%
63
Binance
LINK-TRY$17.91
0.0066244 Eth
$375,691.00
21,104.410 LINK
0.0869%
64
XT.COM
LINK-ETH$17.88
0.0066149 Eth
$340,586.00
18,880.400 LINK
0.0777%
65
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$17.90
0.0066182 Eth
$310,138.00
17,201.383 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0708%
66
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$17.98
0.0066495 Eth
$306,732.00
17,015.946 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0701%
67
BitStorage
LINK-ETH$17.93
0.0066318 Eth
$305,246.00
17,020.800 LINK
0.0701%
68
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$17.90
0.0066183 Eth
$300,358.00
16,693.972 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0687%
69
Bybit
LINK-USDC$17.91
0.0066221 Eth
$288,519.00
16,274.446 LINK
0.0670%
70
BitDelta
LINK-USDT$17.93
0.0066318 Eth
$285,502.00
15,996.000 LINK
0.0659%
71
Slex
LINK-ETH$17.93
0.0066316 Eth
$285,226.00
15,810.100 LINK
0.0651%
72
BitMart
LINK-BTC$17.92
0.0066282 Eth
$263,422.00
14,698.040 LINK
0.0605%
73
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$17.91
0.0066231 Eth
$233,898.00
13,132.131 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0541%
74
Hotcoin
LINK-BTC$17.89
0.0066223 Eth
$198,338.00
11,084.820 LINK
0.0456%
75
CoinTR
LINK-TRY$17.93
0.0066365 Eth
$192,498.00
10,790.830 LINK
0.0444%
76
GMO Japan
LINK-JPY$17.76
0.0065726 Eth
$185,433.00
10,441.600 LINK
0.0430%
77
BYDFi
LINK-USDC$17.94
0.0066310 Eth
$182,036.00
10,147.360 LINK
0.0418%
78
Bitci TR
LINK-TRY$18.06
0.0066820 Eth
$180,732.00
10,126.590 LINK
0.0417%
79
Kraken
LINK-ETH$17.83
0.0065931 Eth
$164,134.00
9,207.043 LINK
0.0379%
80
Binance US
LINK-USDT$17.90
0.0066208 Eth
$148,820.00
8,312.241 LINK
0.0342%
81
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$17.88
0.0066133 Eth
$148,047.00
8,202.530 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0338%
82
Coinbase Exchange
LINK-ETH$17.71
0.0065517 Eth
$130,105.00
7,347.280 LINK
0.0303%
83
DeGate
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$17.87
0.0066119 Eth
$129,256.00
7,273.178 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0299%
84
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$17.95
0.0066383 Eth
$122,990.00
6,862.568 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0283%
85
Kraken
LINK-GBP$17.91
0.0066231 Eth
$112,132.00
6,260.725 LINK
0.0258%
86
WhiteBIT
LINK-TRY$17.92
0.0066290 Eth
$103,350.00
5,765.890 LINK
0.0237%
87
KuCoin
LINK-USDC$17.96
0.0066429 Eth
$92,381.00
5,143.120 LINK
0.0212%
88
Bitso
LINK-USD$17.68
0.0065317 Eth
$91,160.00
5,155.227 LINK
0.0212%
89
Binance
LINK-BNB$17.95
0.0066387 Eth
$84,416.00
4,694.275 LINK
0.0193%
90
Bitkub
LINK-THB$17.94
0.0066320 Eth
$83,767.00
4,669.814 LINK
0.0192%
91
BitMart
LINK-ETH$17.93
0.0066328 Eth
$76,992.00
4,292.920 LINK
0.0177%
92
Uniswap V4 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$17.95
0.0066369 Eth
$74,428.00
74,109.237 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.3051%
93
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$17.94
0.0066340 Eth
$70,336.00
69,994.407 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.2882%
94
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$17.94
0.0066352 Eth
$61,659.00
3,414.084 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0141%
95
Uniswap V3 (Avalanche)
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$18.00
0.0066554 Eth
$57,607.00
3,305.677 0X5947BB275C521040051D82396192181B413227A3
0.0136%
96
Hotcoin
LINK-ETH$17.89
0.0066208 Eth
$55,295.00
3,091.070 LINK
0.0127%
97
Uniswap V4 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$17.95
0.0066369 Eth
$55,274.00
3,054.182 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0126%
98
Binance
LINK-BRL$17.67
0.0065304 Eth
$53,393.00
2,980.420 LINK
0.0123%
99
Uniswap V4 (Ethereum)
0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48-0X514910771AF9CA656AF840DFF83E8264ECF986CA$17.93
0.0066313 Eth
$46,764.00
46,373.815 0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48
0.1909%
100
Dex-Trade
LINK-ETH$17.89
0.0066197 Eth
$39,526.00
2,209.860 LINK
0.0091%

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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