ETH Price: $2,636.77 (-4.08%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

737,667 ( 0.078%)

Market

Price

$17.19 @ 0.006519 ETH (-6.33%)

Onchain Market Cap

$17,190,000,000.00

Circulating Supply Market Cap

$10,971,054,956.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
37.8 LINK

Value
$649.78 ( ~0.246430649979714 Eth) [0.0000%]
0x5F60FAfAA74c72A8136aF84b8fB48CA311E16256
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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 15527.27% |ETH 0.0003846 1595.01%

Market

Volume (24H):$717,641,937.00
Market Capitalization:$10,971,054,956.00
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$17.23
0.0065530 Eth
$75,116,249.00
4,109,021.560 LINK
14.5160%
2
WhiteBIT
LINK-USDT$17.27
0.0065741 Eth
$71,228,287.00
4,125,494.320 LINK
14.5742%
3
Bybit
LINK-USDT$17.22
0.0065407 Eth
$53,095,515.00
2,923,146.794 LINK
10.3267%
4
MEXC
LINK-USDT$17.22
0.0065585 Eth
$39,315,403.00
2,282,513.760 LINK
8.0635%
5
Coinbase Exchange
LINK-USD$17.31
0.0065709 Eth
$26,450,343.00
1,528,214.870 LINK
5.3988%
6
Bitget
LINK-USDT$17.28
0.0065476 Eth
$24,209,396.00
1,331,594.670 LINK
4.7042%
7
HTX
LINK-USDT$17.29
0.0065527 Eth
$18,591,437.00
1,016,761.941 LINK
3.5919%
8
P2B
LINK-USDT$17.21
0.0065338 Eth
$12,857,541.00
747,280.540 LINK
2.6399%
9
Gate.io
LINK-USDT$17.34
0.0065851 Eth
$10,802,211.00
589,155.000 LINK
2.0813%
10
OKX
LINK-USDT$17.31
0.0065590 Eth
$9,028,238.00
494,471.859 LINK
1.7468%
11
DigiFinex
LINK-USDT$17.29
0.0065517 Eth
$8,947,048.00
517,502.430 LINK
1.8282%
12
KuCoin
LINK-USDT$17.33
0.0065817 Eth
$8,087,238.00
466,606.519 LINK
1.6484%
13
XT.COM
LINK-USDT$17.15
0.0065367 Eth
$7,431,468.00
406,925.640 LINK
1.4376%
14
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$17.10
0.0065096 Eth
$6,777,595.00
388,645.691 0X514910771AF9CA656AF840DFF83E8264ECF986CA
1.3730%
15
MEXC
LINK-EUR$17.17
0.0065297 Eth
$6,738,206.00
392,458.020 LINK
1.3864%
16
MEXC
LINK-USDC$17.18
0.0065321 Eth
$6,449,346.00
375,494.080 LINK
1.3265%
17
Coinstore
LINK-USDT$17.31
0.0065741 Eth
$6,409,190.00
350,744.420 LINK
1.2391%
18
LBank
LINK-USDT$17.26
0.0065670 Eth
$6,399,302.00
370,841.560 LINK
1.3101%
19
Hotcoin
LINK-USDT$17.14
0.0065225 Eth
$6,298,089.00
367,376.920 LINK
1.2978%
20
Binance
LINK-FDUSD$17.32
0.0065629 Eth
$5,753,551.00
313,059.830 LINK
1.1060%
21
Binance
LINK-USDC$17.37
0.0065834 Eth
$5,643,089.00
307,682.510 LINK
1.0870%
22
Kraken
LINK-USD$17.23
0.0065428 Eth
$5,514,073.00
320,038.034 LINK
1.1306%
23
CoinW
LINK-USDT$17.19
0.0065495 Eth
$5,300,184.00
308,387.740 LINK
1.0894%
24
Bitunix
LINK-USDT$17.31
0.0065609 Eth
$4,710,784.00
272,015.380 LINK
0.9610%
25
Azbit
LINK-USDT$17.18
0.0065412 Eth
$4,469,704.00
244,648.759 LINK
0.8643%
26
BTSE
LINK-USDT$17.13
0.0065237 Eth
$4,096,785.00
239,136.486 LINK
0.8448%
27
BYDFi
LINK-USDT$17.20
0.0065515 Eth
$3,976,628.00
231,257.060 LINK
0.8170%
28
LATOKEN
LINK-USDT$17.42
0.0065829 Eth
$3,260,769.00
187,194.482 LINK
0.6613%
29
QMall
LINK-USDT$17.18
0.0065461 Eth
$3,116,462.00
170,549.834 LINK
0.6025%
30
Bitvavo
LINK-EUR$17.49
0.0065890 Eth
$3,011,300.00
172,208.680 LINK
0.6084%
31
FMCPAY
LINK-USDT$17.13
0.0065275 Eth
$2,452,080.00
134,308.523 LINK
0.4745%
32
Dex-Trade
LINK-USDT$17.28
0.0065476 Eth
$2,211,473.00
127,992.797 LINK
0.4522%
33
Coinbase Exchange
LINK-GBP$17.17
0.0065411 Eth
$1,952,290.00
113,727.580 LINK
0.4018%
34
Biconomy.com
LINK-USDT$17.34
0.0065845 Eth
$1,489,613.00
81,427.370 LINK
0.2877%
35
CoinEx
LINK-USDT$17.11
0.0065144 Eth
$1,449,531.00
80,110.230 LINK
0.2830%
36
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$17.31
0.0065711 Eth
$1,444,001.00
82,361.369 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.2910%
37
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$17.25
0.0065484 Eth
$1,392,036.00
79,162.346 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.2797%
38
Coinbase Exchange
LINK-EUR$17.32
0.0065616 Eth
$1,260,069.00
72,770.690 LINK
0.2571%
39
PointPay
LINK-USDT$17.20
0.0065515 Eth
$1,228,607.00
67,210.933 LINK
0.2374%
40
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$17.21
0.0065354 Eth
$1,072,009.00
61,090.680 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.2158%
41
FMCPAY
LINK-ETH$17.26
0.0065531 Eth
$1,037,853.00
59,157.600 LINK
0.2090%
42
FMCPAY
LINK-BTC$17.18
0.0065347 Eth
$1,009,404.00
56,807.800 LINK
0.2007%
43
Trubit
LINK-USDT$17.19
0.0065248 Eth
$823,666.00
44,963.810 LINK
0.1588%
44
BigONE
LINK-USDT$17.18
0.0065443 Eth
$820,211.00
47,750.880 LINK
0.1687%
45
tanX
LINK-USDC$17.24
0.0065618 Eth
$790,462.00
43,197.570 LINK
0.1526%
46
Phemex
LINK-USDT$17.34
0.0065845 Eth
$737,091.00
42,499.020 LINK
0.1501%
47
Gemini
LINK-USD$17.20
0.0065196 Eth
$729,517.00
42,403.909 LINK
0.1498%
48
EXMO
LINK-USDT$17.34
0.0065841 Eth
$648,478.00
37,391.950 LINK
0.1321%
49
LATOKEN
LINK-BTC$17.29
0.0065632 Eth
$620,767.00
35,907.733 LINK
0.1269%
50
Binance
LINK-TRY$17.34
0.0065785 Eth
$609,895.00
33,381.740 LINK
0.1179%
51
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$17.34
0.0065814 Eth
$571,502.00
31,259.181 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1104%
52
WhiteBIT
LINK-BTC$17.23
0.0065618 Eth
$562,993.00
32,669.380 LINK
0.1154%
53
BitStorage
LINK-USDT$17.54
0.0066069 Eth
$560,461.00
31,953.800 LINK
0.1129%
54
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$17.30
0.0065680 Eth
$529,788.00
562,763.198 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
1.9881%
55
Bybit
LINK-USDC$17.24
0.0065469 Eth
$470,668.00
25,997.744 LINK
0.0918%
56
QMall
LINK-USDC$17.14
0.0065284 Eth
$461,835.00
25,240.892 LINK
0.0892%
57
Bitbank
LINK-JPY$17.18
0.0065451 Eth
$460,329.00
26,799.039 LINK
0.0947%
58
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$17.19
0.0065467 Eth
$448,696.00
51,629.146 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.1824%
59
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$17.28
0.0065834 Eth
$445,037.00
25,747.693 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0910%
60
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$17.16
0.0065155 Eth
$391,838.00
22,359.315 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0790%
61
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$17.39
0.0066038 Eth
$385,631.00
21,048.402 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0744%
62
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$17.25
0.0065664 Eth
$315,669.00
17,742.810 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0627%
63
BitMart
LINK-BTC$17.19
0.0065296 Eth
$287,423.00
16,715.760 LINK
0.0591%
64
GMO Japan
LINK-JPY$17.35
0.0065744 Eth
$268,643.00
15,485.000 LINK
0.0547%
65
Mercado Bitcoin
LINK-BRL$17.25
0.0065638 Eth
$246,451.00
14,289.022 LINK
0.0505%
66
Coinbase Exchange
LINK-BTC$17.20
0.0065535 Eth
$225,579.00
13,115.830 LINK
0.0463%
67
Hotcoin
LINK-BTC$17.24
0.0065595 Eth
$221,929.00
12,875.530 LINK
0.0455%
68
BitDelta
LINK-USDT$17.14
0.0065309 Eth
$210,077.00
11,479.000 LINK
0.0406%
69
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$17.15
0.0065283 Eth
$203,201.00
11,119.640 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0393%
70
BitStorage
LINK-ETH$17.30
0.0065550 Eth
$198,822.00
11,494.280 LINK
0.0406%
71
Bitkub
LINK-THB$17.28
0.0065841 Eth
$197,740.00
11,444.443 LINK
0.0404%
72
BYDFi
LINK-USDC$17.37
0.0065444 Eth
$197,009.00
11,342.290 LINK
0.0401%
73
OKX
LINK-USDC$17.36
0.0065788 Eth
$190,499.00
10,460.216 LINK
0.0370%
74
Bitci TR
LINK-TRY$17.22
0.0065637 Eth
$184,022.00
10,080.600 LINK
0.0356%
75
Bitbegin
LINK-USDT$17.17
0.0065202 Eth
$161,011.00
8,797.005 LINK
0.0311%
76
bitcastle
LINK-USDT$17.30
0.0065693 Eth
$155,905.00
8,537.860 LINK
0.0302%
77
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$17.26
0.0065512 Eth
$155,260.00
8,855.038 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0313%
78
WhiteBIT
LINK-TRY$17.32
0.0065960 Eth
$153,140.00
8,840.330 LINK
0.0312%
79
Slex
LINK-ETH$17.20
0.0065453 Eth
$152,699.00
8,716.120 LINK
0.0308%
80
DeGate
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$17.09
0.0065085 Eth
$123,589.00
6,761.258 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0239%
81
CoinTR
LINK-TRY$17.19
0.0065513 Eth
$121,852.00
6,685.990 LINK
0.0236%
82
Binance US
LINK-USDT$17.14
0.0065281 Eth
$115,920.00
6,761.273 LINK
0.0239%
83
Uniswap V4 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$17.21
0.0065350 Eth
$113,828.00
121,561.589 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.4294%
84
KuCoin
LINK-USDC$17.35
0.0065883 Eth
$105,547.00
6,083.593 LINK
0.0215%
85
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$17.20
0.0065313 Eth
$103,546.00
109,973.456 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.3885%
86
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$17.39
0.0066186 Eth
$103,474.00
5,904.826 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0209%
87
BitMart
LINK-ETH$17.22
0.0065380 Eth
$92,579.00
5,377.220 LINK
0.0190%
88
Uniswap V4 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$17.22
0.0065373 Eth
$90,412.00
5,155.179 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0182%
89
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$17.31
0.0065712 Eth
$84,999.00
4,773.877 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0169%
90
Bitso
LINK-USD$17.45
0.0065888 Eth
$69,526.00
3,983.443 LINK
0.0141%
91
Hotcoin
LINK-ETH$17.15
0.0065360 Eth
$63,887.00
3,724.520 LINK
0.0132%
92
KuCoin
LINK-BTC$17.25
0.0065520 Eth
$57,474.00
3,331.095 LINK
0.0118%
93
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XDAC17F958D2EE523A2206206994597C13D831EC7$17.15
0.0065317 Eth
$42,694.00
2,357.864 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0083%
94
Uniswap V4 (Ethereum)
0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48-0X514910771AF9CA656AF840DFF83E8264ECF986CA$17.32
0.0065774 Eth
$41,061.00
43,294.469 0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48
0.1529%
95
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$17.28
0.0065749 Eth
$34,507.00
1,972.399 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0070%
96
Bitexen
LINK-TRY$17.14
0.0065325 Eth
$33,183.00
1,935.757 LINK
0.0068%
97
Indodax
LINK-IDR$17.31
0.0065932 Eth
$28,689.00
1,657.482 LINK
0.0059%
98
Dex-Trade
LINK-ETH$17.18
0.0065412 Eth
$25,745.00
1,498.600 LINK
0.0053%
99
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$17.29
0.0065626 Eth
$18,769.80
1,026.010 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0036%
100
THENA FUSION
0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$17.27
0.0065796 Eth
$17,771.14
26.279 0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827
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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