ETH Price: $2,680.35 (+1.63%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

733,382 ( 0.029%)

Market

Price

$18.78 @ 0.007007 ETH (+0.90%)

Onchain Market Cap

$18,780,000,000.00

Circulating Supply Market Cap

$11,982,136,290.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
0 LINK

Value
$0.00
0xfab18fab57e281feb06fe9ccbd990f79def8dd50
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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 16972.73% |ETH 0.0003846 1721.89%

Market

Volume (24H):$648,836,458.00
Market Capitalization:$11,982,136,290.00
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$18.81
0.0070144 Eth
$85,073,343.00
4,626,954.090 LINK
22.2365%
2
Coinbase Exchange
LINK-USD$18.81
0.0070195 Eth
$35,189,165.00
1,870,868.460 LINK
8.9911%
3
Bybit
LINK-USDT$18.81
0.0070144 Eth
$31,136,277.00
1,697,740.251 LINK
8.1591%
4
HTX
LINK-USDT$18.83
0.0070201 Eth
$18,046,252.00
975,999.945 LINK
4.6905%
5
P2B
LINK-USDT$18.76
0.0070040 Eth
$16,778,731.00
894,372.210 LINK
4.2982%
6
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$18.83
0.0070296 Eth
$16,133,736.00
861,081.294 0X514910771AF9CA656AF840DFF83E8264ECF986CA
4.1382%
7
DigiFinex
LINK-USDT$18.82
0.0070175 Eth
$10,785,292.00
573,201.190 LINK
2.7547%
8
OKX
LINK-USDT$18.80
0.0070124 Eth
$10,633,814.00
577,467.842 LINK
2.7752%
9
Gate.io
LINK-USDT$18.81
0.0070162 Eth
$10,322,804.00
563,986.940 LINK
2.7104%
10
MEXC
LINK-USDT$18.78
0.0070115 Eth
$8,797,961.00
468,425.520 LINK
2.2512%
11
XT.COM
LINK-USDT$18.81
0.0070223 Eth
$8,452,241.00
459,709.140 LINK
2.2093%
12
Coinstore
LINK-USDT$18.75
0.0069999 Eth
$7,262,350.00
394,761.110 LINK
1.8972%
13
BTSE
LINK-USDT$18.80
0.0070135 Eth
$7,002,277.00
372,367.744 LINK
1.7895%
14
CoinW
LINK-USDT$18.79
0.0070136 Eth
$6,112,617.00
325,284.110 LINK
1.5633%
15
Bitunix
LINK-USDT$18.74
0.0069953 Eth
$6,106,965.00
325,841.750 LINK
1.5659%
16
Binance
LINK-USDC$18.88
0.0070341 Eth
$6,068,521.00
331,125.000 LINK
1.5913%
17
Binance
LINK-FDUSD$18.75
0.0069993 Eth
$5,838,073.00
317,573.190 LINK
1.5262%
18
KuCoin
LINK-USDT$18.83
0.0070209 Eth
$5,638,341.00
299,453.299 LINK
1.4391%
19
Hotcoin
LINK-USDT$18.79
0.0070163 Eth
$5,624,392.00
299,253.160 LINK
1.4382%
20
BYDFi
LINK-USDT$18.82
0.0070197 Eth
$4,860,784.00
258,287.100 LINK
1.2413%
21
Kraken
LINK-USD$18.81
0.0070143 Eth
$4,434,355.00
235,729.410 LINK
1.1329%
22
LBank
LINK-USDT$18.81
0.0070139 Eth
$4,213,555.00
223,992.780 LINK
1.0765%
23
LATOKEN
LINK-USDT$18.78
0.0070118 Eth
$4,157,879.00
221,343.098 LINK
1.0637%
24
Bitvavo
LINK-EUR$18.79
0.0070128 Eth
$4,108,400.00
218,655.148 LINK
1.0508%
25
Coinbase Exchange
LINK-EUR$18.82
0.0070178 Eth
$3,807,552.00
202,344.390 LINK
0.9724%
26
QMall
LINK-USDT$18.80
0.0070111 Eth
$3,527,387.00
191,957.222 LINK
0.9225%
27
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$18.83
0.0070245 Eth
$3,112,972.00
166,011.637 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.7978%
28
Dex-Trade
LINK-USDT$18.80
0.0070190 Eth
$2,829,651.00
150,510.602 LINK
0.7233%
29
WhiteBIT
LINK-USDT$18.78
0.0070112 Eth
$2,744,004.00
146,115.860 LINK
0.7022%
30
FMCPAY
LINK-USDT$18.81
0.0070125 Eth
$2,465,181.00
133,588.337 LINK
0.6420%
31
Coinbase Exchange
LINK-GBP$18.82
0.0070163 Eth
$2,007,079.00
106,665.490 LINK
0.5126%
32
Biconomy.com
LINK-USDT$18.79
0.0070118 Eth
$1,560,527.00
84,623.710 LINK
0.4067%
33
FMCPAY
LINK-ETH$18.81
0.0070136 Eth
$1,352,416.00
71,964.640 LINK
0.3459%
34
PointPay
LINK-USDT$18.81
0.0070180 Eth
$1,305,822.00
70,991.009 LINK
0.3412%
35
CoinEx
LINK-USDT$18.80
0.0070108 Eth
$1,283,901.00
69,548.954 LINK
0.3342%
36
FMCPAY
LINK-BTC$18.81
0.0070158 Eth
$1,123,487.00
60,551.200 LINK
0.2910%
37
Binance
LINK-ETH$18.86
0.0070247 Eth
$979,234.00
52,363.550 LINK
0.2517%
38
Trubit
LINK-USDT$18.81
0.0070136 Eth
$959,638.00
51,859.120 LINK
0.2492%
39
Phemex
LINK-USDT$18.74
0.0069970 Eth
$942,890.00
50,310.130 LINK
0.2418%
40
EXMO
LINK-USDT$18.82
0.0070162 Eth
$887,795.00
47,182.272 LINK
0.2268%
41
Tokpie
LINK-USDT$18.77
0.0070004 Eth
$840,858.00
44,789.005 LINK
0.2152%
42
tanX
LINK-USDC$18.80
0.0070100 Eth
$828,439.00
44,810.050 LINK
0.2154%
43
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$18.72
0.0069827 Eth
$801,683.00
42,798.525 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.2057%
44
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$18.68
0.0069708 Eth
$779,005.00
83,720.655 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.4023%
45
BigONE
LINK-USDT$18.85
0.0070316 Eth
$759,767.00
40,313.070 LINK
0.1937%
46
Bitbank
LINK-JPY$18.84
0.0070313 Eth
$751,382.00
39,881.173 LINK
0.1917%
47
BitStorage
LINK-USDT$18.81
0.0070181 Eth
$712,606.00
37,894.110 LINK
0.1821%
48
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$18.75
0.0069946 Eth
$639,197.00
34,629.651 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.1664%
49
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$18.76
0.0069969 Eth
$621,353.00
33,231.829 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1597%
50
WhiteBIT
LINK-TRY$18.84
0.0070285 Eth
$612,054.00
32,487.040 LINK
0.1561%
51
Binance
LINK-TRY$18.77
0.0070015 Eth
$586,091.00
31,773.370 LINK
0.1527%
52
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$18.78
0.0070041 Eth
$527,512.00
28,160.614 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1353%
53
Bybit
LINK-USDC$18.74
0.0069895 Eth
$514,160.00
27,931.779 LINK
0.1342%
54
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$18.83
0.0070245 Eth
$506,129.00
27,700.525 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.1331%
55
EarnBIT
LINK-USDT$18.87
0.0070309 Eth
$496,704.00
26,956.492 LINK
0.1295%
56
QMall
LINK-USDC$18.81
0.0070152 Eth
$490,798.00
26,762.456 LINK
0.1286%
57
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$18.73
0.0069845 Eth
$475,880.00
467,410.536 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
2.2463%
58
HashKey Exchange
LINK-USD$18.73
0.0069953 Eth
$400,444.00
21,642.028 LINK
0.1040%
59
WhiteBIT
LINK-BTC$18.82
0.0070187 Eth
$392,814.00
20,873.630 LINK
0.1003%
60
Gemini
LINK-USD$18.83
0.0070242 Eth
$372,820.00
19,795.265 LINK
0.0951%
61
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$18.74
0.0069913 Eth
$332,741.00
17,767.714 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0854%
62
WhiteBIT
LINK-EUR$18.82
0.0070201 Eth
$311,687.00
16,558.500 LINK
0.0796%
63
Slex
LINK-ETH$18.83
0.0070236 Eth
$307,948.00
16,374.300 LINK
0.0787%
64
BitDelta
LINK-USDT$18.75
0.0070003 Eth
$293,255.00
15,917.000 LINK
0.0765%
65
OKX
LINK-USDC$18.74
0.0069892 Eth
$286,169.00
15,451.603 LINK
0.0743%
66
BitMart
LINK-BTC$18.80
0.0070135 Eth
$272,963.00
14,515.500 LINK
0.0698%
67
itBit
LINK-USD$18.81
0.0070205 Eth
$268,316.00
14,264.517 LINK
0.0686%
68
Coinbase Exchange
LINK-ETH$18.78
0.0070073 Eth
$261,721.00
13,938.920 LINK
0.0670%
69
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$18.83
0.0070296 Eth
$248,817.00
13,626.818 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0655%
70
LATOKEN
LINK-BTC$18.80
0.0070177 Eth
$243,631.00
12,959.790 LINK
0.0623%
71
DeGate
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$18.77
0.0070073 Eth
$218,161.00
11,841.337 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0569%
72
Bitso
LINK-USD$18.78
0.0070021 Eth
$214,883.00
11,445.031 LINK
0.0550%
73
BitStorage
LINK-ETH$18.75
0.0069974 Eth
$209,255.00
11,160.480 LINK
0.0536%
74
Hotcoin
LINK-BTC$18.86
0.0070246 Eth
$194,479.00
10,313.890 LINK
0.0496%
75
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$18.83
0.0070245 Eth
$185,585.00
180,544.907 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.8677%
76
BYDFi
LINK-USDC$18.75
0.0069946 Eth
$176,836.00
9,431.190 LINK
0.0453%
77
bitcastle
LINK-USDT$18.74
0.0069966 Eth
$175,125.00
9,516.340 LINK
0.0457%
78
GMO Japan
LINK-JPY$18.63
0.0069558 Eth
$170,575.00
9,157.000 LINK
0.0440%
79
Coinbase Exchange
LINK-BTC$18.78
0.0070011 Eth
$170,411.00
9,076.090 LINK
0.0436%
80
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$18.86
0.0070325 Eth
$163,958.00
8,864.921 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0426%
81
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$18.79
0.0070068 Eth
$158,438.00
8,508.115 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0409%
82
KuCoin
LINK-USDC$18.73
0.0069859 Eth
$155,634.00
8,307.143 LINK
0.0399%
83
Binance
LINK-BNB$18.85
0.0070312 Eth
$140,978.00
7,561.696 LINK
0.0363%
84
CoinTR
LINK-TRY$18.79
0.0070138 Eth
$131,999.00
7,109.590 LINK
0.0342%
85
Kraken
LINK-GBP$18.80
0.0070113 Eth
$131,725.00
7,005.528 LINK
0.0337%
86
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XDAC17F958D2EE523A2206206994597C13D831EC7$18.83
0.0070296 Eth
$130,252.00
7,108.407 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0342%
87
OKX
LINK-EUR$18.75
0.0069942 Eth
$128,141.00
6,875.404 LINK
0.0330%
88
Bitkub
LINK-THB$18.84
0.0070270 Eth
$118,500.00
6,289.117 LINK
0.0302%
89
Uniswap V4 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$18.86
0.0070405 Eth
$112,632.00
109,819.139 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.5278%
90
BitMart
LINK-ETH$18.81
0.0070139 Eth
$82,498.00
4,386.820 LINK
0.0211%
91
Uniswap V4 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$18.84
0.0070301 Eth
$69,619.00
3,698.510 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0178%
92
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$18.84
0.0070253 Eth
$67,862.00
3,615.962 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0174%
93
PancakeSwap (v2)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$18.85
0.0070291 Eth
$67,157.00
3,645.970 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0175%
94
Indodax
LINK-IDR$18.74
0.0069903 Eth
$66,504.00
3,548.211 LINK
0.0171%
95
KuCoin
LINK-BTC$18.87
0.0070360 Eth
$65,847.00
3,489.630 LINK
0.0168%
96
Binance US
LINK-USDT$18.77
0.0070078 Eth
$53,974.00
2,875.477 LINK
0.0138%
97
Hotcoin
LINK-ETH$18.76
0.0070043 Eth
$53,619.00
2,857.740 LINK
0.0137%
98
Bitexen
LINK-TRY$18.67
0.0069635 Eth
$33,476.00
1,793.162 LINK
0.0086%
99
Dex-Trade
LINK-ETH$18.76
0.0070022 Eth
$29,848.00
1,591.400 LINK
0.0076%
100
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$18.84
0.0070248 Eth
$27,983.00
1,498.837 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0072%

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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