ETH Price: $2,721.45 (+0.83%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

735,048 ( 0.004%)

Market

Price

$19.57 @ 0.007191 ETH (+4.11%)

Onchain Market Cap

$19,570,000,000.00

Circulating Supply Market Cap

$12,491,262,522.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
4.916707765262409736 LINK

Value
$96.22 ( ~0.0353562127366501 Eth) [0.0000%]
0x949e2660e66101f462e273e60a3dbc58b7ff13cd
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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 17690.91% |ETH 0.0003846 1769.73%

Market

Volume (24H):$567,695,264.00
Market Capitalization:$12,491,262,522.00
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
Coinbase Exchange
LINK-USD$19.55
0.0071810 Eth
$34,376,338.00
1,758,740.320 LINK
13.7275%
2
Bybit
LINK-USDT$19.54
0.0071806 Eth
$26,863,619.00
1,391,450.641 LINK
10.8607%
3
HTX
LINK-USDT$19.54
0.0071808 Eth
$20,030,726.00
1,039,704.627 LINK
8.1152%
4
P2B
LINK-USDT$19.54
0.0071810 Eth
$12,903,094.00
660,250.140 LINK
5.1534%
5
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$19.58
0.0071936 Eth
$10,818,569.00
561,160.239 0X514910771AF9CA656AF840DFF83E8264ECF986CA
4.3800%
6
OKX
LINK-USDT$19.57
0.0071902 Eth
$9,345,162.00
483,465.681 LINK
3.7736%
7
DigiFinex
LINK-USDT$19.54
0.0071807 Eth
$8,187,565.00
418,925.370 LINK
3.2698%
8
Gate.io
LINK-USDT$19.54
0.0071792 Eth
$7,075,639.00
365,451.740 LINK
2.8525%
9
Binance
LINK-USDC$19.54
0.0071798 Eth
$6,496,852.00
336,199.830 LINK
2.6241%
10
XT.COM
LINK-USDT$19.61
0.0072027 Eth
$6,371,902.00
329,775.060 LINK
2.5740%
11
WhiteBIT
LINK-USDT$19.52
0.0071737 Eth
$5,914,407.00
302,945.030 LINK
2.3646%
12
KuCoin
LINK-USDT$19.53
0.0071764 Eth
$5,734,818.00
293,636.442 LINK
2.2919%
13
Coinstore
LINK-USDT$19.55
0.0071821 Eth
$5,544,651.00
287,307.690 LINK
2.2425%
14
CoinW
LINK-USDT$19.59
0.0071974 Eth
$5,003,969.00
255,378.270 LINK
1.9933%
15
BTSE
LINK-USDT$19.59
0.0071984 Eth
$4,983,324.00
254,331.789 LINK
1.9851%
16
Binance
LINK-FDUSD$19.59
0.0071945 Eth
$4,696,914.00
243,383.760 LINK
1.8997%
17
Hotcoin
LINK-USDT$19.54
0.0071810 Eth
$4,238,642.00
216,889.050 LINK
1.6929%
18
Kraken
LINK-USD$19.59
0.0071989 Eth
$4,145,595.00
211,598.907 LINK
1.6516%
19
Azbit
LINK-USDT$19.55
0.0071848 Eth
$3,725,751.00
192,926.356 LINK
1.5058%
20
BYDFi
LINK-USDT$19.55
0.0071848 Eth
$3,592,794.00
183,733.930 LINK
1.4341%
21
LATOKEN
LINK-USDT$19.54
0.0071810 Eth
$3,160,017.00
161,697.313 LINK
1.2621%
22
Coinbase Exchange
LINK-EUR$19.55
0.0071855 Eth
$2,614,141.00
133,681.650 LINK
1.0434%
23
QMall
LINK-USDT$19.53
0.0071762 Eth
$2,565,847.00
132,831.072 LINK
1.0368%
24
Dex-Trade
LINK-USDT$19.57
0.0071909 Eth
$2,064,220.00
105,463.390 LINK
0.8232%
25
FMCPAY
LINK-USDT$19.58
0.0071953 Eth
$2,009,694.00
104,122.281 LINK
0.8127%
26
MEXC
LINK-USDC$19.57
0.0071888 Eth
$1,943,405.00
99,319.780 LINK
0.7752%
27
Bitvavo
LINK-EUR$19.57
0.0071899 Eth
$1,919,781.00
98,120.881 LINK
0.7659%
28
Coinbase Exchange
LINK-GBP$19.56
0.0071885 Eth
$1,796,375.00
91,824.490 LINK
0.7167%
29
CoinEx
LINK-USDT$19.58
0.0071950 Eth
$1,690,530.00
87,060.385 LINK
0.6795%
30
Biconomy.com
LINK-USDT$19.56
0.0071872 Eth
$1,586,562.00
82,165.020 LINK
0.6413%
31
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$19.54
0.0071808 Eth
$1,468,361.00
76,247.661 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.5951%
32
FMCPAY
LINK-ETH$19.53
0.0071747 Eth
$1,265,957.00
65,729.760 LINK
0.5130%
33
FMCPAY
LINK-BTC$19.54
0.0071803 Eth
$1,063,758.00
55,030.300 LINK
0.4295%
34
PointPay
LINK-USDT$19.57
0.0071857 Eth
$989,784.00
51,229.798 LINK
0.3999%
35
Trubit
LINK-USDT$19.58
0.0071954 Eth
$764,545.00
39,700.790 LINK
0.3099%
36
tanX
LINK-USDC$19.54
0.0071796 Eth
$744,240.00
38,620.860 LINK
0.3014%
37
EXMO
LINK-USDT$19.55
0.0071847 Eth
$741,208.00
37,907.843 LINK
0.2959%
38
Gemini
LINK-USD$19.54
0.0071807 Eth
$704,714.00
36,061.017 LINK
0.2815%
39
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$19.54
0.0071792 Eth
$686,521.00
35,779.002 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.2793%
40
Phemex
LINK-USDT$19.55
0.0071847 Eth
$671,902.00
34,363.260 LINK
0.2682%
41
LATOKEN
LINK-BTC$19.60
0.0071990 Eth
$651,433.00
33,244.407 LINK
0.2595%
42
Binance
LINK-EUR$19.61
0.0071982 Eth
$641,477.00
33,278.420 LINK
0.2597%
43
Bitbank
LINK-JPY$19.57
0.0071887 Eth
$626,734.00
32,025.756 LINK
0.2500%
44
WhiteBIT
LINK-BTC$19.53
0.0071749 Eth
$611,123.00
31,297.560 LINK
0.2443%
45
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$19.60
0.0072026 Eth
$578,244.00
570,161.769 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
4.4503%
46
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$19.60
0.0072007 Eth
$577,633.00
29,899.729 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.2334%
47
BigONE
LINK-USDT$19.56
0.0071803 Eth
$570,653.00
29,178.640 LINK
0.2277%
48
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$19.58
0.0071945 Eth
$567,085.00
29,362.087 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.2292%
49
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$19.52
0.0071720 Eth
$549,351.00
28,780.288 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.2246%
50
Binance
LINK-TRY$19.61
0.0072050 Eth
$541,675.00
28,135.850 LINK
0.2196%
51
QMall
LINK-USDC$19.54
0.0071810 Eth
$500,905.00
25,944.815 LINK
0.2025%
52
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$19.53
0.0071754 Eth
$488,158.00
25,099.802 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1959%
53
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$19.59
0.0071962 Eth
$471,463.00
24,530.103 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1915%
54
Bitbegin
LINK-USDT$19.56
0.0071874 Eth
$452,060.00
23,428.606 LINK
0.1829%
55
EarnBIT
LINK-USDT$19.58
0.0071944 Eth
$443,590.00
22,944.390 LINK
0.1791%
56
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$19.58
0.0071947 Eth
$438,630.00
42,947.111 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.3352%
57
Bybit
LINK-USDC$19.55
0.0071846 Eth
$410,070.00
21,228.869 LINK
0.1657%
58
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$19.55
0.0071849 Eth
$396,104.00
20,497.423 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1600%
59
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$19.53
0.0071774 Eth
$331,360.00
17,222.698 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.1344%
60
BitMart
LINK-BTC$19.58
0.0071932 Eth
$267,533.00
13,666.380 LINK
0.1067%
61
OKX
LINK-USDC$19.61
0.0072053 Eth
$267,185.00
13,797.822 LINK
0.1077%
62
BitDelta
LINK-USDT$19.58
0.0071953 Eth
$227,807.00
11,827.000 LINK
0.0923%
63
KuCoin
LINK-BTC$19.61
0.0072064 Eth
$222,989.00
11,370.101 LINK
0.0887%
64
Bitci TR
LINK-TRY$19.71
0.0072453 Eth
$197,485.00
10,267.620 LINK
0.0801%
65
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$19.48
0.0071590 Eth
$183,727.00
9,510.865 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0742%
66
Coinbase Exchange
LINK-BTC$19.58
0.0071935 Eth
$182,253.00
9,306.870 LINK
0.0726%
67
CoinTR
LINK-TRY$19.61
0.0072024 Eth
$157,039.00
8,169.580 LINK
0.0638%
68
Hotcoin
LINK-BTC$19.57
0.0071912 Eth
$149,082.00
7,617.780 LINK
0.0595%
69
BYDFi
LINK-USDC$19.54
0.0071839 Eth
$139,716.00
7,151.880 LINK
0.0558%
70
Kraken
LINK-GBP$19.49
0.0071629 Eth
$139,527.00
7,157.506 LINK
0.0559%
71
DeGate
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$19.53
0.0071767 Eth
$136,537.00
7,070.742 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0552%
72
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$19.50
0.0071659 Eth
$127,282.00
6,599.563 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0515%
73
Binance US
LINK-USDT$19.59
0.0071990 Eth
$117,192.00
5,981.567 LINK
0.0467%
74
BitStorage
LINK-ETH$19.57
0.0071883 Eth
$116,744.00
5,965.740 LINK
0.0466%
75
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$19.54
0.0071808 Eth
$97,925.00
96,499.644 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.7532%
76
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$19.55
0.0071847 Eth
$95,838.00
4,976.528 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0388%
77
Uniswap V4 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$19.58
0.0071952 Eth
$93,803.00
92,497.632 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.7220%
78
KuCoin
LINK-USDC$19.53
0.0071746 Eth
$88,292.00
4,521.355 LINK
0.0353%
79
Kanga
LINK-PLN$19.60
0.0072028 Eth
$87,727.00
0.000 LINK
0.0000%
80
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$19.50
0.0071639 Eth
$80,552.00
4,184.329 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0327%
81
Uniswap V4 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$19.58
0.0071952 Eth
$74,715.00
3,864.582 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0302%
82
BitMart
LINK-ETH$19.57
0.0071904 Eth
$70,146.00
3,584.660 LINK
0.0280%
83
Bitkub
LINK-THB$19.59
0.0071978 Eth
$53,999.00
2,756.625 LINK
0.0215%
84
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$19.54
0.0071806 Eth
$51,377.00
2,666.005 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0208%
85
Binance US
LINK-BTC$19.54
0.0071814 Eth
$46,626.00
2,385.663 LINK
0.0186%
86
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$19.53
0.0071747 Eth
$45,214.00
3,610.748 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0282%
87
Hotcoin
LINK-ETH$19.56
0.0071854 Eth
$42,170.00
2,155.720 LINK
0.0168%
88
EXMO
LINK-BTC$19.59
0.0071997 Eth
$38,297.00
1,954.551 LINK
0.0153%
89
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XDAC17F958D2EE523A2206206994597C13D831EC7$19.48
0.0071575 Eth
$37,137.00
1,922.361 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0150%
90
Uniswap V4 (Arbitrum)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$19.55
0.0071813 Eth
$33,675.00
1,740.130 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0136%
91
Indodax
LINK-IDR$19.67
0.0072279 Eth
$24,619.00
1,251.588 LINK
0.0098%
92
THENA FUSION
0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$19.47
0.0071552 Eth
$22,878.00
30.901 0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827
0.0002%
93
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$19.60
0.0072023 Eth
$22,874.00
1,176.118 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0092%
94
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$19.60
0.0072015 Eth
$16,423.96
16,183.527 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.1263%
95
Dex-Trade
LINK-ETH$19.54
0.0071781 Eth
$16,248.58
831.630 LINK
0.0065%
96
Bitexen
LINK-TRY$19.44
0.0071361 Eth
$15,676.84
806.556 LINK
0.0063%
97
Uniswap V3 (Avalanche)
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$19.72
0.0072471 Eth
$13,335.95
683.266 0X5947BB275C521040051D82396192181B413227A3
0.0053%
98
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$19.60
0.0072007 Eth
$13,247.21
685.999 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0054%
99
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X55D398326F99059FF775485246999027B3197955$19.53
0.0071780 Eth
$11,821.45
613.338 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0048%
100
Uniswap V3 (BSC)
0XCF6BB5389C92BDDA8A3747DDB454CB7A64626C63-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$19.53
0.0071780 Eth
$11,098.45
1,362.601 0XCF6BB5389C92BDDA8A3747DDB454CB7A64626C63
0.0106%

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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