ETH Price: $2,650.82 (-0.95%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

721,556 (0.00%)

Market

Price

$12.40 @ 0.004678 ETH (-3.16%)

Onchain Market Cap

$12,400,000,000.00

Circulating Supply Market Cap

$7,775,149,437.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
0 LINK

Value
$0.00
0x2aa263efeb05704893b2237898ff43e5893cfe92
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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 11172.73% |ETH 0.0003846 1116.33%

Market

Volume (24H):$317,609,265.00
Market Capitalization:$7,775,149,437.00
Circulating Supply:626,849,971.00 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
LBank
LINK-USDT$12.39
0.0046803 Eth
$33,362,973.00
2,692,553.190 LINK
18.6625%
2
Binance
LINK-USDT$12.41
0.0046878 Eth
$19,643,171.00
1,560,920.210 LINK
10.8190%
3
WhiteBIT
LINK-USDT$12.41
0.0046890 Eth
$12,733,470.00
1,026,389.390 LINK
7.1140%
4
Bybit
LINK-USDT$12.38
0.0046746 Eth
$12,083,350.00
959,521.758 LINK
6.6506%
5
Coinbase Exchange
LINK-USD$12.38
0.0046776 Eth
$10,293,991.00
831,233.100 LINK
5.7614%
6
HTX
LINK-USDT$12.40
0.0046830 Eth
$9,455,594.00
750,404.186 LINK
5.2012%
7
Bitget
LINK-USDT$12.40
0.0046852 Eth
$8,978,769.00
712,092.433 LINK
4.9356%
8
Websea
LINK-USDT$12.41
0.0046859 Eth
$8,571,341.00
0.000 LINK
0.0000%
9
Azbit
LINK-USDT$12.39
0.0046813 Eth
$6,283,437.00
498,495.930 LINK
3.4551%
10
WEEX
LINK-USDT$12.37
0.0046769 Eth
$5,708,353.00
452,918.540 LINK
3.1392%
11
Biconomy.com
LINK-USDT$12.40
0.0046826 Eth
$5,165,573.00
409,731.940 LINK
2.8399%
12
P2B
LINK-USDT$12.40
0.0046840 Eth
$3,936,441.00
317,434.610 LINK
2.2002%
13
BVOX
LINK-USDT$12.41
0.0046856 Eth
$3,907,380.00
310,379.446 LINK
2.1513%
14
Slex
LINK-USDT$12.39
0.0046802 Eth
$3,255,951.00
258,616.980 LINK
1.7925%
15
OKX
LINK-USDT$12.40
0.0046843 Eth
$3,018,521.00
239,700.954 LINK
1.6614%
16
Upbit
LINK-KRW$12.38
0.0046746 Eth
$2,476,869.00
200,138.384 LINK
1.3872%
17
DigiFinex
LINK-USDT$12.40
0.0046818 Eth
$2,446,344.00
197,362.450 LINK
1.3679%
18
Deepcoin
LINK-USDT$12.40
0.0046839 Eth
$2,272,216.00
178,969.100 LINK
1.2405%
19
KuCoin
LINK-USDT$12.40
0.0046840 Eth
$2,271,093.00
183,139.073 LINK
1.2694%
20
ProBit Global
LINK-USDT$12.42
0.0046885 Eth
$2,192,423.00
176,591.900 LINK
1.2240%
21
Trubit
LINK-USDT$12.42
0.0046913 Eth
$2,041,773.00
162,107.220 LINK
1.1236%
22
XT.COM
LINK-USDT$12.40
0.0046841 Eth
$1,807,267.00
143,635.580 LINK
0.9956%
23
AscendEX (BitMax)
LINK-USDT$12.43
0.0046931 Eth
$1,698,778.00
136,721.600 LINK
0.9476%
24
Gate.io
LINK-USDT$12.38
0.0046766 Eth
$1,634,989.00
130,046.420 LINK
0.9014%
25
C-Patex
LINK-USDT$12.43
0.0046988 Eth
$1,623,178.00
130,600.632 LINK
0.9052%
26
Crypto.com Exchange
LINK-USDT$12.40
0.0046825 Eth
$1,458,900.00
117,682.440 LINK
0.8157%
27
CoinW
LINK-USDT$12.40
0.0046893 Eth
$1,396,184.00
112,565.290 LINK
0.7802%
28
Kraken
LINK-USD$12.42
0.0046923 Eth
$1,281,047.00
103,121.721 LINK
0.7148%
29
Azbit
LINK-ETH$12.42
0.0046924 Eth
$1,070,346.00
85,272.597 LINK
0.5910%
30
FMCPAY
LINK-USDT$12.40
0.0046844 Eth
$1,039,371.00
82,598.753 LINK
0.5725%
31
BYDFi
LINK-USDT$12.42
0.0046946 Eth
$981,068.00
78,984.750 LINK
0.5475%
32
WhiteBIT
LINK-BTC$12.41
0.0046893 Eth
$920,845.00
74,220.130 LINK
0.5144%
33
Bitvavo
LINK-EUR$12.38
0.0046778 Eth
$788,226.00
63,671.318 LINK
0.4413%
34
HashKey Global
LINK-USDT$12.41
0.0046869 Eth
$692,754.00
54,810.725 LINK
0.3799%
35
Kraken
LINK-USDT$12.42
0.0046908 Eth
$673,971.00
54,270.475 LINK
0.3762%
36
Dex-Trade
LINK-USDT$12.42
0.0046954 Eth
$647,489.00
52,134.580 LINK
0.3614%
37
Bybit
LINK-USDC$12.40
0.0046838 Eth
$631,473.00
50,081.673 LINK
0.3471%
38
HitBTC
LINK-USDT$12.40
0.0046850 Eth
$629,289.00
49,904.940 LINK
0.3459%
39
FMFW.io
LINK-USDT$12.43
0.0046933 Eth
$620,155.00
49,907.400 LINK
0.3459%
40
FMCPAY
LINK-BTC$12.39
0.0046805 Eth
$569,520.00
45,394.500 LINK
0.3146%
41
tanX
LINK-USDC$12.45
0.0046861 Eth
$529,057.00
41,929.900 LINK
0.2906%
42
FMCPAY
LINK-ETH$12.40
0.0046834 Eth
$511,730.00
40,738.240 LINK
0.2824%
43
EXMO
LINK-USDT$12.39
0.0046813 Eth
$413,131.00
33,333.364 LINK
0.2310%
44
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$12.40
0.0046843 Eth
$380,837.00
30,405.315 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.2107%
45
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$12.32
0.0046544 Eth
$365,083.00
29,395.483 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.2037%
46
Bithumb
LINK-KRW$12.39
0.0046799 Eth
$354,067.00
28,574.367 LINK
0.1981%
47
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$12.39
0.0046781 Eth
$350,022.00
27,913.269 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1935%
48
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$12.37
0.0046734 Eth
$335,468.00
26,868.039 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.1862%
49
PointPay
LINK-USDT$12.42
0.0046916 Eth
$314,928.00
25,037.826 LINK
0.1735%
50
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$12.37
0.0046713 Eth
$311,475.00
24,851.121 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1722%
51
CoinEx
LINK-USDT$12.41
0.0046878 Eth
$300,405.00
23,859.406 LINK
0.1654%
52
Pionex
LINK-USDT$12.40
0.0046841 Eth
$295,483.00
23,504.750 LINK
0.1629%
53
ProBit Global
LINK-BTC$12.41
0.0046875 Eth
$287,106.00
23,130.201 LINK
0.1603%
54
LATOKEN
LINK-USDT$12.40
0.0046835 Eth
$272,677.00
21,986.585 LINK
0.1524%
55
LATOKEN
LINK-BTC$12.41
0.0046870 Eth
$247,501.00
19,941.468 LINK
0.1382%
56
BigONE
LINK-USDT$12.39
0.0046803 Eth
$217,726.00
17,571.050 LINK
0.1218%
57
BitMart
LINK-BTC$12.43
0.0046938 Eth
$190,611.00
15,338.460 LINK
0.1063%
58
Bitci TR
LINK-TRY$12.39
0.0046787 Eth
$129,687.00
10,264.650 LINK
0.0711%
59
BitDelta
LINK-USDT$12.41
0.0046875 Eth
$127,407.00
10,114.000 LINK
0.0701%
60
Coinbase Exchange
LINK-BTC$12.32
0.0046536 Eth
$117,850.00
9,564.610 LINK
0.0663%
61
Slex
LINK-BTC$12.40
0.0046853 Eth
$117,570.00
9,386.600 LINK
0.0651%
62
Gemini
LINK-USD$12.40
0.0046828 Eth
$108,017.00
8,712.715 LINK
0.0604%
63
Coinbase Exchange
LINK-ETH$12.36
0.0046721 Eth
$87,847.00
7,108.600 LINK
0.0493%
64
PointPay
LINK-BTC$12.42
0.0046930 Eth
$75,702.00
6,044.434 LINK
0.0419%
65
Slex
LINK-ETH$12.40
0.0046854 Eth
$72,092.00
5,747.840 LINK
0.0398%
66
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$12.39
0.0046791 Eth
$62,771.00
5,081.328 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0352%
67
Bitget
LINK-EUR$12.42
0.0046903 Eth
$60,848.00
4,827.650 LINK
0.0335%
68
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$12.43
0.0046931 Eth
$56,366.00
57,074.743 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.3956%
69
EXMO
LINK-BTC$12.40
0.0046818 Eth
$46,863.00
3,780.806 LINK
0.0262%
70
OKX
LINK-USDC$12.40
0.0046843 Eth
$44,338.00
3,515.405 LINK
0.0244%
71
BYDFi
LINK-USDC$12.35
0.0046701 Eth
$42,734.00
3,461.330 LINK
0.0240%
72
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$12.43
0.0046931 Eth
$40,982.00
3,260.610 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0226%
73
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$12.32
0.0046544 Eth
$37,298.00
38,014.580 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.2635%
74
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$12.41
0.0046868 Eth
$29,712.00
2,366.975 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0164%
75
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$12.44
0.0046990 Eth
$28,053.00
2,237.691 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0155%
76
Binance US
LINK-USDT$12.39
0.0046833 Eth
$27,398.00
2,211.108 LINK
0.0153%
77
Ace
LINK-USDT$12.42
0.0046894 Eth
$25,223.00
1,990.520 LINK
0.0138%
78
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$12.36
0.0046698 Eth
$24,948.00
25,394.115 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.1760%
79
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$12.40
0.0046818 Eth
$22,730.00
1,803.578 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0125%
80
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$12.36
0.0046672 Eth
$22,241.00
1,783.851 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0124%
81
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$12.40
0.0046850 Eth
$19,083.54
1,520.979 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0105%
82
KuCoin
LINK-KCS$12.45
0.0047024 Eth
$13,868.17
1,113.700 LINK
0.0077%
83
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$12.38
0.0046779 Eth
$12,153.24
972.163 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0067%
84
Coinone
LINK-KRW$12.34
0.0046600 Eth
$10,683.78
865.958 LINK
0.0060%
85
CoinEx
LINK-BTC$12.36
0.0046701 Eth
$8,718.38
696.698 LINK
0.0048%
86
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X1BFD67037B42CF73ACF2047067BD4F2C47D9BFD6$12.41
0.0046866 Eth
$7,055.32
563.200 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0039%
87
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$12.32
0.0046544 Eth
$6,888.68
7,007.806 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.0486%
88
LFJ
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$12.46
0.0047045 Eth
$6,722.48
533.617 0X5947BB275C521040051D82396192181B413227A3
0.0037%
89
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$12.39
0.0046811 Eth
$3,994.97
316.274 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0022%
90
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X55D398326F99059FF775485246999027B3197955$12.35
0.0046652 Eth
$3,590.00
285.800 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0020%
91
Ramses V2
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$12.34
0.0046619 Eth
$3,175.28
254.281 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0018%
92
PancakeSwap V3 (Arbitrum)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$12.33
0.0046577 Eth
$2,315.21
185.070 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0013%
93
CoinEx
LINK-USDC$12.39
0.0046813 Eth
$2,285.18
180.463 LINK
0.0013%
94
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$12.36
0.0046698 Eth
$1,737.86
138.737 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0010%
95
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$12.30
0.0046550 Eth
$940.54
75.443 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0005%
96
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$12.35
0.0046646 Eth
$911.69
73.648 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0005%
97
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$12.38
0.0046836 Eth
$342.27
348.109 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.0024%
98
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$12.38
0.0046836 Eth
$320.22
25.576 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0002%
99
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0XDA10009CBD5D07DD0CECC66161FC93D7C9000DA1$12.36
0.0046785 Eth
$182.13
14.453 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0001%
100
Balancer V2 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XDF7837DE1F2FA4631D716CF2502F8B230F1DCC32$12.34
0.0046651 Eth
$176.83
13.794 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
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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