ETH Price: $3,215.93 (+3.29%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

726,101 ( 0.034%)

Market

Price

$20.26 @ 0.006300 ETH (+6.21%)

Onchain Market Cap

$20,260,000,000.00

Circulating Supply Market Cap

$12,798,247,964.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
100.4945 LINK

Value
$2,036.02 ( ~0.633104284848393 Eth) [0.0000%]
0x9e44fda245f23bf3622300db4743077487360e98
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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 18318.18% |ETH 0.0003846 1538.07%

Market

Volume (24H):$689,653,714.00
Market Capitalization:$12,798,247,964.00
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$20.31
0.0063278 Eth
$95,656,965.00
4,830,910.970 LINK
23.7803%
2
Coinbase Exchange
LINK-USD$20.30
0.0063103 Eth
$29,828,210.00
1,469,587.140 LINK
7.2341%
3
Slex
LINK-USDT$20.29
0.0063068 Eth
$19,507,893.00
985,839.980 LINK
4.8528%
4
P2B
LINK-USDT$20.31
0.0063103 Eth
$19,336,596.00
952,001.870 LINK
4.6862%
5
Bitget
LINK-USDT$20.29
0.0063044 Eth
$16,195,316.00
818,658.149 LINK
4.0299%
6
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$20.22
0.0062929 Eth
$15,112,329.00
756,419.476 0X514910771AF9CA656AF840DFF83E8264ECF986CA
3.7235%
7
Gate.io
LINK-USDT$20.28
0.0063016 Eth
$12,871,108.00
646,939.810 LINK
3.1846%
8
Bybit
LINK-USDT$20.32
0.0063146 Eth
$12,792,544.00
645,546.471 LINK
3.1777%
9
MEXC
LINK-USDT$20.27
0.0063073 Eth
$12,030,822.00
593,521.780 LINK
2.9216%
10
DigiFinex
LINK-USDT$20.28
0.0062999 Eth
$11,770,074.00
580,476.940 LINK
2.8574%
11
HTX
LINK-USDT$20.27
0.0062965 Eth
$10,773,423.00
546,015.564 LINK
2.6878%
12
OKX
LINK-USDT$20.28
0.0063006 Eth
$10,677,574.00
539,938.671 LINK
2.6579%
13
XT.COM
LINK-USDT$20.27
0.0063083 Eth
$9,354,895.00
472,422.440 LINK
2.3255%
14
Azbit
LINK-USDT$20.28
0.0063139 Eth
$8,840,149.00
446,752.251 LINK
2.1991%
15
Coinstore
LINK-USDT$20.21
0.0062915 Eth
$8,453,836.00
427,202.590 LINK
2.1029%
16
CoinW
LINK-USDT$20.27
0.0063089 Eth
$7,926,980.00
391,128.940 LINK
1.9253%
17
Bitunix
LINK-USDT$20.28
0.0063083 Eth
$7,224,237.00
356,135.340 LINK
1.7531%
18
Hotcoin
LINK-USDT$20.29
0.0063062 Eth
$7,049,564.00
347,477.350 LINK
1.7105%
19
Binance
LINK-FDUSD$20.31
0.0063185 Eth
$6,590,133.00
332,585.690 LINK
1.6372%
20
BYDFi
LINK-USDT$20.30
0.0063141 Eth
$5,409,063.00
266,519.960 LINK
1.3119%
21
LBank
LINK-USDT$20.30
0.0063141 Eth
$4,757,512.00
234,416.180 LINK
1.1539%
22
LATOKEN
LINK-USDT$20.30
0.0063109 Eth
$4,520,380.00
222,691.971 LINK
1.0962%
23
Binance
LINK-USDC$20.30
0.0063222 Eth
$4,395,439.00
222,011.930 LINK
1.0929%
24
QMall
LINK-USDT$20.26
0.0063036 Eth
$3,886,318.00
196,272.419 LINK
0.9662%
25
KuCoin
LINK-USDT$20.28
0.0063012 Eth
$3,719,011.00
183,376.354 LINK
0.9027%
26
Kraken
LINK-USD$20.32
0.0063146 Eth
$3,430,137.00
168,774.228 LINK
0.8308%
27
BTSE
LINK-USDT$20.27
0.0063108 Eth
$3,365,545.00
166,003.263 LINK
0.8172%
28
Dex-Trade
LINK-USDT$20.30
0.0063109 Eth
$2,999,392.00
147,762.000 LINK
0.7274%
29
FMCPAY
LINK-USDT$20.30
0.0063075 Eth
$2,571,780.00
129,838.532 LINK
0.6391%
30
Biconomy.com
LINK-USDT$20.25
0.0063030 Eth
$1,759,966.00
89,022.828 LINK
0.4382%
31
Bitvavo
LINK-EUR$20.28
0.0063103 Eth
$1,679,064.00
82,782.077 LINK
0.4075%
32
PointPay
LINK-USDT$20.29
0.0063110 Eth
$1,576,593.00
79,529.640 LINK
0.3915%
33
Coinbase Exchange
LINK-EUR$20.32
0.0063160 Eth
$1,569,823.00
77,273.080 LINK
0.3804%
34
Coinbase Exchange
LINK-GBP$20.31
0.0063142 Eth
$1,517,677.00
74,727.610 LINK
0.3678%
35
CoinEx
LINK-USDT$20.31
0.0063208 Eth
$1,410,853.00
71,200.681 LINK
0.3505%
36
FMCPAY
LINK-ETH$20.28
0.0063035 Eth
$1,177,796.00
58,854.240 LINK
0.2897%
37
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$20.26
0.0062973 Eth
$1,176,727.00
58,490.606 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.2879%
38
FMCPAY
LINK-BTC$20.26
0.0062992 Eth
$1,173,443.00
58,783.200 LINK
0.2894%
39
EXMO
LINK-USDT$20.28
0.0063010 Eth
$1,116,367.00
55,047.986 LINK
0.2710%
40
Phemex
LINK-USDT$20.31
0.0063140 Eth
$1,052,287.00
51,814.350 LINK
0.2551%
41
tanX
LINK-USDC$20.30
0.0063154 Eth
$966,712.00
48,876.870 LINK
0.2406%
42
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$20.34
0.0063299 Eth
$946,404.00
47,062.742 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.2317%
43
BigONE
LINK-USDT$20.33
0.0063284 Eth
$927,861.00
45,639.250 LINK
0.2247%
44
Azbit
LINK-ETH$20.28
0.0063116 Eth
$886,244.00
44,337.573 LINK
0.2183%
45
Trubit
LINK-USDT$20.28
0.0063043 Eth
$796,515.00
40,192.520 LINK
0.1978%
46
Gemini
LINK-USD$20.26
0.0062936 Eth
$609,593.00
30,093.989 LINK
0.1481%
47
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$20.34
0.0063216 Eth
$527,670.00
26,284.322 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1294%
48
Coinbase Exchange
LINK-USDT$20.29
0.0063132 Eth
$510,355.00
25,158.128 LINK
0.1238%
49
EarnBIT
LINK-USDT$20.27
0.0062976 Eth
$494,072.00
24,979.645 LINK
0.1230%
50
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$20.26
0.0063016 Eth
$444,277.00
433,363.591 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
2.1332%
51
Bitbank
LINK-JPY$20.30
0.0063159 Eth
$428,755.00
21,116.171 LINK
0.1039%
52
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$20.32
0.0063247 Eth
$414,343.00
20,709.701 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.1019%
53
QMall
LINK-USDC$20.27
0.0063070 Eth
$366,169.00
18,471.666 LINK
0.0909%
54
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$20.22
0.0062928 Eth
$360,143.00
18,304.821 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0901%
55
Binance
LINK-TRY$20.28
0.0063126 Eth
$350,039.00
17,607.990 LINK
0.0867%
56
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$20.34
0.0063291 Eth
$346,120.00
338,139.176 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
1.6645%
57
Bybit
LINK-USDC$20.29
0.0063047 Eth
$341,993.00
17,315.703 LINK
0.0852%
58
GMO Japan
LINK-JPY$20.22
0.0062930 Eth
$276,651.00
13,683.000 LINK
0.0674%
59
BitMart
LINK-BTC$20.29
0.0063033 Eth
$270,534.00
13,333.980 LINK
0.0656%
60
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$20.25
0.0062994 Eth
$265,200.00
13,278.004 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0654%
61
Hotcoin
LINK-BTC$20.28
0.0063133 Eth
$249,145.00
12,282.950 LINK
0.0605%
62
BYDFi
LINK-USDC$20.24
0.0063077 Eth
$231,104.00
11,420.150 LINK
0.0562%
63
BitDelta
LINK-USDT$20.28
0.0063013 Eth
$227,603.00
11,502.000 LINK
0.0566%
64
OKX
LINK-USDC$20.27
0.0062986 Eth
$226,056.00
11,460.968 LINK
0.0564%
65
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$20.23
0.0062968 Eth
$215,611.00
16,111.864 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.0793%
66
Coinbase Exchange
LINK-BTC$20.28
0.0062992 Eth
$193,446.00
9,540.790 LINK
0.0470%
67
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$20.29
0.0063054 Eth
$161,323.00
8,077.540 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0398%
68
Kraken
LINK-GBP$20.30
0.0063075 Eth
$152,846.00
7,529.001 LINK
0.0371%
69
Slex
LINK-ETH$20.29
0.0063045 Eth
$149,005.00
7,427.030 LINK
0.0366%
70
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$20.34
0.0063216 Eth
$139,771.00
7,060.847 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0348%
71
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$20.31
0.0063251 Eth
$134,902.00
6,655.629 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0328%
72
DeGate
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$20.30
0.0063171 Eth
$129,378.00
6,518.402 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0321%
73
BitStorage
LINK-ETH$20.26
0.0063051 Eth
$121,931.00
6,019.020 LINK
0.0296%
74
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$20.21
0.0062896 Eth
$114,514.00
5,776.011 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0284%
75
Binance US
LINK-USDT$20.27
0.0063085 Eth
$108,031.00
5,330.580 LINK
0.0262%
76
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$20.27
0.0062993 Eth
$102,200.00
5,102.283 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0251%
77
LATOKEN
LINK-BTC$20.28
0.0063031 Eth
$95,710.00
4,720.412 LINK
0.0232%
78
BitMart
LINK-ETH$20.30
0.0063072 Eth
$86,188.00
4,245.420 LINK
0.0209%
79
Hotcoin
LINK-ETH$20.26
0.0063061 Eth
$84,795.00
4,185.170 LINK
0.0206%
80
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$20.24
0.0062992 Eth
$66,707.00
3,358.513 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0165%
81
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$20.34
0.0063299 Eth
$54,344.00
52,580.967 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.2588%
82
BTCMarkets
LINK-AUD$20.29
0.0063026 Eth
$45,413.00
2,238.566 LINK
0.0110%
83
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$20.19
0.0062749 Eth
$44,282.00
2,198.762 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0108%
84
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$20.34
0.0063300 Eth
$40,992.00
2,054.846 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0101%
85
THENA FUSION
0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$20.26
0.0062950 Eth
$35,368.00
45.967 0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827
0.0002%
86
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$20.33
0.0063184 Eth
$31,559.00
1,596.745 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0079%
87
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XDAC17F958D2EE523A2206206994597C13D831EC7$20.27
0.0063088 Eth
$28,101.00
1,429.032 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0070%
88
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$20.19
0.0062845 Eth
$18,033.60
904.440 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0045%
89
Dex-Trade
LINK-ETH$20.29
0.0063174 Eth
$15,904.73
783.690 LINK
0.0039%
90
Gemini
LINK-BTC$20.37
0.0063297 Eth
$12,694.50
623.123 LINK
0.0031%
91
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XD6DF932A45C0F255F85145F286EA0B292B21C90B$20.48
0.0063661 Eth
$11,801.23
594.969 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0029%
92
LFJ
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$20.27
0.0063003 Eth
$10,485.84
516.446 0X5947BB275C521040051D82396192181B413227A3
0.0025%
93
Biswap V3
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$20.26
0.0063105 Eth
$9,516.69
476.333 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0023%
94
Uniswap V3 (Arbitrum One)
0XBA5DDD1F9D7F570DC94A51479A000E3BCE967196-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$20.22
0.0062925 Eth
$9,170.60
30.637 0XBA5DDD1F9D7F570DC94A51479A000E3BCE967196
0.0002%
95
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X55D398326F99059FF775485246999027B3197955$20.26
0.0062978 Eth
$8,278.31
418.670 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0021%
96
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X1BFD67037B42CF73ACF2047067BD4F2C47D9BFD6$20.40
0.0063390 Eth
$7,035.56
351.711 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0017%
97
Pangolin
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$20.34
0.0063265 Eth
$6,955.38
343.101 0X5947BB275C521040051D82396192181B413227A3
0.0017%
98
zondacrypto
LINK-USDC$20.31
0.0063187 Eth
$4,468.02
219.952 LINK
0.0011%
99
Ace
LINK-USDT$20.30
0.0063099 Eth
$3,811.42
192.530 LINK
0.0009%
100
Bitexen
LINK-TRY$20.16
0.0062767 Eth
$3,501.00
173.693 LINK
0.0009%

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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