ETH Price: $2,813.16 (+2.66%)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

732,586 ( -0.003%)

Market

Price

$19.42 @ 0.006903 ETH (-2.65%)

Onchain Market Cap

$19,420,000,000.00

Circulating Supply Market Cap

$12,392,378,570.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
0 LINK

Value
$0.00
0x29ede0ea2cc89c648a33914fedd9f553b6dc3f4e
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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 17554.55% |ETH 0.0003846 1694.85%

Market

Volume (24H):$779,899,520.00
Market Capitalization:$12,392,378,570.00
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$19.39
0.0069061 Eth
$111,772,909.00
5,695,750.270 LINK
24.6909%
2
Coinbase Exchange
LINK-USD$19.37
0.0069008 Eth
$53,608,255.00
2,767,020.480 LINK
11.9949%
3
Bybit
LINK-USDT$19.39
0.0068975 Eth
$39,927,586.00
2,038,767.454 LINK
8.8380%
4
Slex
LINK-USDT$19.43
0.0069226 Eth
$18,738,189.00
957,384.360 LINK
4.1502%
5
HTX
LINK-USDT$19.36
0.0068870 Eth
$17,226,593.00
879,213.333 LINK
3.8114%
6
DigiFinex
LINK-USDT$19.43
0.0069053 Eth
$13,426,747.00
691,190.790 LINK
2.9963%
7
Gate.io
LINK-USDT$19.42
0.0069090 Eth
$12,344,653.00
631,154.540 LINK
2.7360%
8
OKX
LINK-USDT$19.40
0.0068967 Eth
$12,272,777.00
625,159.492 LINK
2.7100%
9
XT.COM
LINK-USDT$19.37
0.0068869 Eth
$11,189,451.00
569,509.130 LINK
2.4688%
10
Azbit
LINK-USDT$19.41
0.0069090 Eth
$9,723,219.00
494,256.323 LINK
2.1426%
11
Coinstore
LINK-USDT$19.41
0.0069205 Eth
$9,354,184.00
476,984.900 LINK
2.0677%
12
MEXC
LINK-USDT$19.38
0.0068981 Eth
$9,071,490.00
468,101.940 LINK
2.0292%
13
Binance
LINK-USDC$19.40
0.0068973 Eth
$8,523,337.00
436,134.200 LINK
1.8906%
14
KuCoin
LINK-USDT$19.38
0.0068898 Eth
$8,368,316.00
431,759.831 LINK
1.8717%
15
Bitunix
LINK-USDT$19.38
0.0069008 Eth
$8,130,422.00
419,450.900 LINK
1.8183%
16
CoinW
LINK-USDT$19.37
0.0068982 Eth
$7,441,978.00
384,262.370 LINK
1.6658%
17
BTSE
LINK-USDT$19.39
0.0069047 Eth
$6,984,572.00
360,225.442 LINK
1.5616%
18
Binance
LINK-FDUSD$19.46
0.0069290 Eth
$6,922,182.00
352,640.240 LINK
1.5287%
19
BYDFi
LINK-USDT$19.42
0.0069124 Eth
$6,242,613.00
321,465.130 LINK
1.3935%
20
Hotcoin
LINK-USDT$19.43
0.0069167 Eth
$5,866,462.00
301,998.180 LINK
1.3092%
21
LATOKEN
LINK-USDT$19.38
0.0068903 Eth
$5,536,503.00
285,716.357 LINK
1.2386%
22
Kraken
LINK-USD$19.40
0.0068970 Eth
$5,341,146.00
275,365.650 LINK
1.1937%
23
QMall
LINK-USDT$19.38
0.0068981 Eth
$4,591,523.00
234,053.447 LINK
1.0146%
24
Coinbase Exchange
LINK-EUR$19.41
0.0069058 Eth
$4,039,859.00
208,080.650 LINK
0.9020%
25
Dex-Trade
LINK-USDT$19.40
0.0068974 Eth
$3,617,912.00
186,512.990 LINK
0.8085%
26
Bitvavo
LINK-EUR$19.42
0.0069142 Eth
$2,498,213.00
128,632.252 LINK
0.5576%
27
FMCPAY
LINK-USDT$19.41
0.0069047 Eth
$2,222,228.00
113,777.576 LINK
0.4932%
28
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$19.44
0.0069136 Eth
$1,867,926.00
93,898.564 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.4070%
29
PointPay
LINK-USDT$19.38
0.0069025 Eth
$1,778,734.00
90,695.464 LINK
0.3932%
30
Coinbase Exchange
LINK-GBP$19.39
0.0069040 Eth
$1,766,680.00
91,124.050 LINK
0.3950%
31
Biconomy.com
LINK-USDT$19.39
0.0069040 Eth
$1,758,965.00
89,737.910 LINK
0.3890%
32
CoinEx
LINK-USDT$19.40
0.0068996 Eth
$1,433,093.00
73,388.278 LINK
0.3181%
33
FMCPAY
LINK-ETH$19.41
0.0069087 Eth
$1,371,174.00
68,983.120 LINK
0.2990%
34
Phemex
LINK-USDT$19.37
0.0068966 Eth
$1,223,969.00
63,182.960 LINK
0.2739%
35
EXMO
LINK-USDT$19.43
0.0069100 Eth
$1,186,059.00
61,052.793 LINK
0.2647%
36
FMCPAY
LINK-BTC$19.44
0.0069289 Eth
$1,154,925.00
59,324.700 LINK
0.2572%
37
Binance
LINK-ETH$19.45
0.0069226 Eth
$1,000,877.00
49,962.710 LINK
0.2166%
38
Coinbase Exchange
LINK-USDT$19.37
0.0068990 Eth
$961,040.00
49,617.138 LINK
0.2151%
39
BitStorage
LINK-USDT$19.37
0.0068989 Eth
$895,313.00
46,224.590 LINK
0.2004%
40
WhiteBIT
LINK-TRY$19.47
0.0069355 Eth
$887,935.00
45,601.710 LINK
0.1977%
41
tanX
LINK-USDC$19.39
0.0069008 Eth
$868,949.00
44,331.760 LINK
0.1922%
42
Gemini
LINK-USD$19.39
0.0068994 Eth
$836,465.00
43,138.091 LINK
0.1870%
43
Trubit
LINK-USDT$19.37
0.0069008 Eth
$820,335.00
41,994.290 LINK
0.1820%
44
Coinbase Exchange
LINK-ETH$19.47
0.0069233 Eth
$810,492.00
41,626.570 LINK
0.1804%
45
Bitbank
LINK-JPY$19.48
0.0069374 Eth
$765,453.00
39,286.865 LINK
0.1703%
46
BigONE
LINK-USDT$19.38
0.0068977 Eth
$724,705.00
37,396.150 LINK
0.1621%
47
Binance
LINK-TRY$19.40
0.0068958 Eth
$708,404.00
36,078.840 LINK
0.1564%
48
QMall
LINK-USDC$19.40
0.0069062 Eth
$690,635.00
35,332.588 LINK
0.1532%
49
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$19.38
0.0069027 Eth
$639,402.00
32,157.599 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1394%
50
EarnBIT
LINK-USDT$19.41
0.0069083 Eth
$580,219.00
29,594.840 LINK
0.1283%
51
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$19.38
0.0069004 Eth
$539,942.00
27,793.898 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1205%
52
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$19.41
0.0069125 Eth
$536,176.00
27,095.719 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.1175%
53
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$19.35
0.0068921 Eth
$496,131.00
501,924.644 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
2.1758%
54
Binance
LINK-EUR$19.44
0.0069219 Eth
$477,894.00
24,401.550 LINK
0.1058%
55
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$19.44
0.0069136 Eth
$475,138.00
24,385.017 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.1057%
56
OKX
LINK-USDC$19.38
0.0068906 Eth
$439,039.00
22,284.381 LINK
0.0966%
57
LATOKEN
LINK-BTC$19.36
0.0068854 Eth
$377,327.00
19,486.130 LINK
0.0845%
58
itBit
LINK-USD$19.41
0.0069106 Eth
$377,222.00
19,434.415 LINK
0.0842%
59
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$19.57
0.0069580 Eth
$351,001.00
17,630.998 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0764%
60
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$19.40
0.0069077 Eth
$340,918.00
17,222.154 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0747%
61
Slex
LINK-ETH$19.39
0.0069043 Eth
$326,195.00
16,427.970 LINK
0.0712%
62
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$19.38
0.0068999 Eth
$324,057.00
16,311.500 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0707%
63
Binance
LINK-BNB$19.40
0.0068980 Eth
$260,831.00
13,320.626 LINK
0.0577%
64
BitMart
LINK-BTC$19.39
0.0069042 Eth
$243,862.00
12,576.500 LINK
0.0545%
65
Bitkub
LINK-THB$19.49
0.0069391 Eth
$235,641.00
12,091.357 LINK
0.0524%
66
DeGate
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$19.35
0.0068937 Eth
$232,143.00
11,886.657 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0515%
67
KuCoin
LINK-USDC$19.39
0.0068938 Eth
$231,583.00
11,941.457 LINK
0.0518%
68
BitStorage
LINK-ETH$19.38
0.0069029 Eth
$220,454.00
11,375.310 LINK
0.0493%
69
Hotcoin
LINK-BTC$19.38
0.0069037 Eth
$217,723.00
11,233.110 LINK
0.0487%
70
GMO Japan
LINK-JPY$19.43
0.0069203 Eth
$204,985.00
10,548.100 LINK
0.0457%
71
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$19.35
0.0068916 Eth
$191,470.00
9,789.722 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0424%
72
BYDFi
LINK-USDC$19.43
0.0069208 Eth
$186,431.00
9,597.420 LINK
0.0416%
73
WhiteBIT
LINK-BTC$19.36
0.0068960 Eth
$184,524.00
9,530.960 LINK
0.0413%
74
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$19.42
0.0069023 Eth
$176,511.00
8,985.714 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0390%
75
WhiteBIT
LINK-EUR$19.53
0.0069576 Eth
$173,632.00
8,888.870 LINK
0.0385%
76
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$19.35
0.0068790 Eth
$154,373.00
16,613.386 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.0720%
77
PointPay
LINK-BTC$19.39
0.0069060 Eth
$137,922.00
7,086.502 LINK
0.0307%
78
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$19.44
0.0069116 Eth
$137,355.00
7,056.683 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0306%
79
Bitso
LINK-USD$19.44
0.0069209 Eth
$117,136.00
6,024.422 LINK
0.0261%
80
BitMart
LINK-ETH$19.39
0.0069024 Eth
$77,072.00
3,975.780 LINK
0.0172%
81
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$19.44
0.0069136 Eth
$76,027.00
76,662.908 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.3323%
82
KuCoin
LINK-BTC$19.40
0.0068980 Eth
$75,167.00
3,873.606 LINK
0.0168%
83
Hotcoin
LINK-ETH$19.38
0.0069040 Eth
$60,845.00
3,139.030 LINK
0.0136%
84
PancakeSwap (v2)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$19.49
0.0069411 Eth
$56,455.00
2,852.273 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0124%
85
CoinEx
LINK-USDC$19.35
0.0068816 Eth
$48,430.00
2,480.702 LINK
0.0108%
86
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XDAC17F958D2EE523A2206206994597C13D831EC7$19.42
0.0069023 Eth
$48,231.00
2,467.268 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0107%
87
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$19.40
0.0069043 Eth
$43,711.00
44,472.888 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.1928%
88
Binance US
LINK-USDT$19.43
0.0069081 Eth
$39,329.00
2,024.375 LINK
0.0088%
89
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$19.38
0.0069025 Eth
$37,040.00
1,904.854 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0083%
90
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$19.42
0.0069159 Eth
$36,241.00
1,814.236 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0079%
91
Dex-Trade
LINK-ETH$19.38
0.0068926 Eth
$29,039.00
1,498.080 LINK
0.0065%
92
Uniswap V3 (Avalanche)
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$19.58
0.0069711 Eth
$28,136.00
1,449.557 0X5947BB275C521040051D82396192181B413227A3
0.0063%
93
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$19.46
0.0069311 Eth
$26,206.00
2,104.504 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0091%
94
THENA FUSION
0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$19.43
0.0069202 Eth
$23,744.00
38.458 0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827
0.0002%
95
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$19.48
0.0069345 Eth
$22,594.00
1,152.957 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0050%
96
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFA7F8980B0F1E64A2062791CC3B0871572F1F7F0$19.48
0.0069329 Eth
$21,889.00
1,097.930 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0048%
97
Bitexen
LINK-TRY$19.24
0.0068511 Eth
$21,090.00
1,095.988 LINK
0.0048%
98
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$19.43
0.0069148 Eth
$19,659.02
991.606 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0043%
99
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X55D398326F99059FF775485246999027B3197955$19.41
0.0069032 Eth
$19,033.63
973.774 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0042%
100
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X1BFD67037B42CF73ACF2047067BD4F2C47D9BFD6$19.49
0.0069415 Eth
$18,018.86
924.080 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
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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