ETH Price: $3,478.05 (+2.27%)
Gas: 3.93 Gwei

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

727,062 ( -0.004%)

Market

Price

$24.62 @ 0.007079 ETH (+3.10%)

Onchain Market Cap

$24,620,000,000.00

Circulating Supply Market Cap

$15,557,800,530.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
32.819977379968523802 LINK

Value
$808.03 ( ~0.232322678904495 Eth) [0.0000%]
0x1e473618193b78c24b9afcf07f4c3693e657114e
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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 22281.82% |ETH 0.0003846 1740.61%

Market

Volume (24H):$1,700,568,117.00
Market Capitalization:$15,557,800,530.00
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$24.52
0.0070574 Eth
$205,112,420.00
8,231,827.830 LINK
23.3927%
2
Coinbase Exchange
LINK-USD$24.55
0.0070659 Eth
$69,295,014.00
2,822,147.680 LINK
8.0198%
3
MEXC
LINK-USDT$24.55
0.0070630 Eth
$48,399,080.00
1,971,496.680 LINK
5.6025%
4
Bybit
LINK-USDT$24.56
0.0070656 Eth
$45,023,785.00
1,803,386.780 LINK
5.1247%
5
P2B
LINK-USDT$24.57
0.0070673 Eth
$41,978,856.00
1,708,886.370 LINK
4.8562%
6
OKX
LINK-USDT$24.56
0.0070670 Eth
$31,437,350.00
1,260,355.233 LINK
3.5816%
7
CoinW
LINK-USDT$24.56
0.0070688 Eth
$30,186,504.00
1,228,856.610 LINK
3.4921%
8
DigiFinex
LINK-USDT$24.57
0.0070693 Eth
$25,907,136.00
1,054,325.720 LINK
2.9961%
9
Slex
LINK-USDT$24.66
0.0070905 Eth
$25,672,360.00
1,030,882.800 LINK
2.9295%
10
WEEX
LINK-USDT$24.54
0.0070631 Eth
$25,105,694.00
1,007,541.020 LINK
2.8632%
11
XT.COM
LINK-USDT$24.55
0.0070648 Eth
$23,317,837.00
935,683.350 LINK
2.6590%
12
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$24.53
0.0070575 Eth
$22,165,201.00
886,737.127 0X514910771AF9CA656AF840DFF83E8264ECF986CA
2.5199%
13
FameEX
LINK-USDT$24.55
0.0070649 Eth
$20,466,945.00
821,447.124 LINK
2.3343%
14
Azbit
LINK-USDT$24.51
0.0070535 Eth
$20,186,772.00
810,281.324 LINK
2.3026%
15
Coinstore
LINK-USDT$24.53
0.0070595 Eth
$17,188,704.00
690,464.410 LINK
1.9621%
16
Bitunix
LINK-USDT$24.55
0.0070664 Eth
$15,946,719.00
649,634.140 LINK
1.8461%
17
HTX
LINK-USDT$24.57
0.0070685 Eth
$13,013,582.00
522,987.576 LINK
1.4862%
18
BTSE
LINK-USDT$24.53
0.0070603 Eth
$12,299,199.00
501,389.367 LINK
1.4248%
19
Binance
LINK-FDUSD$24.57
0.0070679 Eth
$12,090,247.00
485,030.010 LINK
1.3783%
20
BYDFi
LINK-USDT$24.58
0.0070513 Eth
$11,593,733.00
471,660.580 LINK
1.3403%
21
KuCoin
LINK-USDT$24.56
0.0070655 Eth
$10,207,150.00
415,634.372 LINK
1.1811%
22
LATOKEN
LINK-USDT$24.53
0.0070578 Eth
$9,795,942.00
399,346.544 LINK
1.1348%
23
Kraken
LINK-USD$24.56
0.0070655 Eth
$9,355,663.00
380,960.995 LINK
1.0826%
24
Biconomy.com
LINK-USDT$24.56
0.0070676 Eth
$9,123,461.00
365,997.880 LINK
1.0401%
25
QMall
LINK-USDT$24.54
0.0070635 Eth
$8,425,865.00
338,029.598 LINK
0.9606%
26
Dex-Trade
LINK-USDT$24.56
0.0070696 Eth
$6,680,668.00
272,012.330 LINK
0.7730%
27
Hotcoin
LINK-USDT$24.56
0.0070688 Eth
$6,104,232.00
248,559.310 LINK
0.7063%
28
Bitvavo
LINK-EUR$24.65
0.0070949 Eth
$5,107,199.00
207,184.175 LINK
0.5888%
29
Binance
LINK-USDC$24.63
0.0070649 Eth
$4,956,183.00
198,962.950 LINK
0.5654%
30
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$24.68
0.0071045 Eth
$4,813,933.00
192,666.388 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.5475%
31
PointPay
LINK-USDT$24.55
0.0070652 Eth
$3,207,345.00
128,516.309 LINK
0.3652%
32
CoinEx
LINK-USDT$24.69
0.0070946 Eth
$3,120,130.00
124,947.271 LINK
0.3551%
33
Coinbase Exchange
LINK-EUR$24.65
0.0070959 Eth
$3,118,161.00
126,489.340 LINK
0.3594%
34
Dcoin
LINK-USDT$24.59
0.0070713 Eth
$3,040,324.00
123,643.000 LINK
0.3514%
35
EXMO
LINK-USDT$24.57
0.0070698 Eth
$3,024,583.00
123,081.424 LINK
0.3498%
36
WhiteBIT
LINK-BTC$24.56
0.0070682 Eth
$2,328,790.00
94,828.880 LINK
0.2695%
37
WhiteBIT
LINK-TRY$24.73
0.0071143 Eth
$2,224,032.00
89,920.140 LINK
0.2555%
38
Coinbase Exchange
LINK-USDT$24.58
0.0070701 Eth
$2,191,299.00
89,167.694 LINK
0.2534%
39
Phemex
LINK-USDT$24.57
0.0070705 Eth
$2,096,480.00
85,326.630 LINK
0.2425%
40
BitMart
LINK-USDT$24.55
0.0070644 Eth
$2,025,860.00
82,503.160 LINK
0.2345%
41
BitStorage
LINK-USDT$24.54
0.0070638 Eth
$1,657,233.00
67,531.390 LINK
0.1919%
42
tanX
LINK-USDC$24.57
0.0070716 Eth
$1,553,394.00
62,406.110 LINK
0.1773%
43
EarnBIT
LINK-USDT$24.55
0.0070667 Eth
$1,506,955.00
60,411.432 LINK
0.1717%
44
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$24.53
0.0070583 Eth
$1,390,566.00
55,680.618 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1582%
45
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$24.63
0.0070860 Eth
$1,281,228.00
50,493.933 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.1435%
46
Binance
LINK-TRY$24.67
0.0070986 Eth
$1,255,409.00
50,036.430 LINK
0.1422%
47
Bitbank
LINK-JPY$24.63
0.0070862 Eth
$1,176,301.00
47,757.793 LINK
0.1357%
48
Bybit
LINK-USDC$24.54
0.0070609 Eth
$1,093,292.00
43,751.785 LINK
0.1243%
49
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$24.59
0.0070749 Eth
$1,064,393.00
43,063.628 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1224%
50
Koinpark
LINK-USDT$24.53
0.0070602 Eth
$1,034,237.00
42,164.723 LINK
0.1198%
51
WhiteBIT
LINK-EUR$24.57
0.0070713 Eth
$969,549.00
39,466.970 LINK
0.1122%
52
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$24.51
0.0070534 Eth
$940,419.00
37,704.697 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1071%
53
BigONE
LINK-USDT$24.53
0.0070600 Eth
$918,630.00
37,450.340 LINK
0.1064%
54
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$24.53
0.0070575 Eth
$887,649.00
62,675.984 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.1781%
55
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$24.70
0.0071076 Eth
$886,033.00
35,464.594 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.1008%
56
KuCoin
LINK-USDC$24.51
0.0070530 Eth
$833,224.00
33,988.928 LINK
0.0966%
57
Binance
LINK-EUR$24.63
0.0070862 Eth
$793,615.00
31,691.050 LINK
0.0901%
58
GMO Japan
LINK-JPY$24.77
0.0071190 Eth
$684,717.00
27,637.500 LINK
0.0785%
59
Gemini
LINK-USD$24.51
0.0070514 Eth
$663,878.00
27,086.025 LINK
0.0770%
60
Coinbase Exchange
LINK-ETH$24.52
0.0070550 Eth
$644,930.00
26,305.750 LINK
0.0748%
61
HashKey Exchange
LINK-USD$24.75
0.0071112 Eth
$594,299.00
23,805.574 LINK
0.0676%
62
Azbit
LINK-ETH$24.58
0.0070744 Eth
$577,154.00
23,250.523 LINK
0.0661%
63
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$24.53
0.0070583 Eth
$516,601.00
525,823.901 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
1.4943%
64
WEEX
LINK-USDC$24.52
0.0070580 Eth
$500,982.00
20,429.186 LINK
0.0581%
65
itBit
LINK-USD$24.50
0.0070515 Eth
$487,330.00
19,891.002 LINK
0.0565%
66
BitMart
LINK-BTC$24.56
0.0070664 Eth
$453,907.00
18,480.080 LINK
0.0525%
67
Coinbase Exchange
LINK-BTC$24.55
0.0070653 Eth
$442,325.00
18,020.100 LINK
0.0512%
68
Slex
LINK-ETH$24.57
0.0070697 Eth
$440,639.00
17,716.240 LINK
0.0503%
69
DeGate
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$24.58
0.0070725 Eth
$436,115.00
17,487.996 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0497%
70
Slex
LINK-BTC$24.55
0.0070635 Eth
$431,779.00
17,255.400 LINK
0.0490%
71
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$24.68
0.0071045 Eth
$405,929.00
411,032.629 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
1.1680%
72
LATOKEN
LINK-BTC$24.66
0.0070927 Eth
$366,670.00
14,868.210 LINK
0.0423%
73
Binance US
LINK-USDT$24.53
0.0070603 Eth
$360,307.00
14,688.253 LINK
0.0417%
74
BitDelta
LINK-USDT$24.54
0.0070619 Eth
$356,177.00
14,319.000 LINK
0.0407%
75
OKX
LINK-USDC$24.58
0.0070710 Eth
$340,332.00
13,638.280 LINK
0.0388%
76
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$24.54
0.0070619 Eth
$294,219.00
11,908.347 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0338%
77
PointPay
LINK-BTC$24.54
0.0070638 Eth
$276,271.00
11,049.802 LINK
0.0314%
78
Bitkub
LINK-THB$24.79
0.0071272 Eth
$271,029.00
10,933.920 LINK
0.0311%
79
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$24.56
0.0070666 Eth
$268,139.00
10,744.066 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0305%
80
BitMart
LINK-ETH$24.56
0.0070652 Eth
$249,200.00
10,147.480 LINK
0.0288%
81
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$24.83
0.0071444 Eth
$240,318.00
9,616.662 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0273%
82
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$24.53
0.0070575 Eth
$234,861.00
9,455.951 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0269%
83
Uniswap V2 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$24.66
0.0070985 Eth
$229,485.00
9,265.188 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0263%
84
Hotcoin
LINK-BTC$24.58
0.0070722 Eth
$209,954.00
8,541.270 LINK
0.0243%
85
KuCoin
LINK-BTC$24.53
0.0070581 Eth
$204,555.00
8,338.272 LINK
0.0237%
86
HTX
LINK-BTC$24.56
0.0070665 Eth
$188,291.00
7,468.929 LINK
0.0212%
87
Bitso
LINK-USD$24.67
0.0070936 Eth
$169,914.00
6,888.770 LINK
0.0196%
88
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$24.53
0.0070583 Eth
$135,771.00
5,439.275 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0155%
89
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$24.69
0.0071058 Eth
$129,177.00
5,158.089 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0147%
90
PancakeSwap (v2)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$24.52
0.0070564 Eth
$108,402.00
4,290.770 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0122%
91
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$24.55
0.0070646 Eth
$84,806.00
3,402.926 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0097%
92
Nonkyc.io
LINK-BTC$24.63
0.0070895 Eth
$76,289.00
3,062.235 LINK
0.0087%
93
Hotcoin
LINK-ETH$24.53
0.0070600 Eth
$73,272.00
2,986.980 LINK
0.0085%
94
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$24.75
0.0071236 Eth
$73,220.00
5,128.110 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.0146%
95
THENA FUSION
0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$24.61
0.0070808 Eth
$70,673.00
94.417 0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827
0.0003%
96
Bitexen
LINK-TRY$24.46
0.0070380 Eth
$65,529.00
2,678.660 LINK
0.0076%
97
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XD6DF932A45C0F255F85145F286EA0B292B21C90B$24.52
0.0070555 Eth
$48,788.00
1,955.660 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0056%
98
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XDAC17F958D2EE523A2206206994597C13D831EC7$24.54
0.0070615 Eth
$47,839.00
1,899.742 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0054%
99
Uniswap V3 (Avalanche)
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$24.38
0.0070155 Eth
$40,444.00
1,639.031 0X5947BB275C521040051D82396192181B413227A3
0.0047%
100
Binance US
LINK-BTC$24.57
0.0070727 Eth
$34,527.00
1,405.048 LINK
0.0040%

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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