ETH Price: $3,474.39 (-0.50%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

727,187 ( 0.008%)

Market

Price

$24.55 @ 0.007066 ETH (-1.01%)

Onchain Market Cap

$24,550,000,000.00

Circulating Supply Market Cap

$15,482,324,229.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
0 LINK

Value
$0.00
0x27239549dd40e1d60f5b80b0c4196923745b1fd2
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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 22218.18% |ETH 0.0003846 1737.23%

Market

Volume (24H):$1,406,569,749.00
Market Capitalization:$15,482,324,229.00
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$24.53
0.0070609 Eth
$163,388,141.00
6,536,167.150 LINK
26.6529%
2
Coinbase Exchange
LINK-USD$24.55
0.0070694 Eth
$48,627,367.00
1,980,425.480 LINK
8.0757%
3
Bybit
LINK-USDT$24.54
0.0070654 Eth
$38,359,381.00
1,532,870.784 LINK
6.2507%
4
CoinW
LINK-USDT$24.55
0.0070675 Eth
$29,474,545.00
1,200,726.590 LINK
4.8963%
5
Slex
LINK-USDT$24.54
0.0070634 Eth
$25,544,247.00
1,025,450.690 LINK
4.1815%
6
OKX
LINK-USDT$24.53
0.0070617 Eth
$25,511,830.00
1,019,767.113 LINK
4.1584%
7
DigiFinex
LINK-USDT$24.53
0.0070625 Eth
$20,615,639.00
840,295.660 LINK
3.4265%
8
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$24.64
0.0070930 Eth
$18,683,987.00
745,214.622 0X514910771AF9CA656AF840DFF83E8264ECF986CA
3.0388%
9
XT.COM
LINK-USDT$24.54
0.0070646 Eth
$17,965,089.00
718,155.190 LINK
2.9285%
10
FameEX
LINK-USDT$24.55
0.0070704 Eth
$16,337,310.00
653,611.999 LINK
2.6653%
11
Azbit
LINK-USDT$24.56
0.0070709 Eth
$16,141,384.00
645,819.241 LINK
2.6335%
12
Coinstore
LINK-USDT$24.56
0.0070710 Eth
$13,978,229.00
559,818.780 LINK
2.2828%
13
Bitunix
LINK-USDT$24.55
0.0070690 Eth
$12,749,944.00
519,315.250 LINK
2.1176%
14
HTX
LINK-USDT$24.54
0.0070663 Eth
$12,083,869.00
485,172.849 LINK
1.9784%
15
BYDFi
LINK-USDT$24.50
0.0070559 Eth
$9,540,560.00
389,340.050 LINK
1.5876%
16
Biconomy.com
LINK-USDT$24.54
0.0070661 Eth
$8,351,799.00
334,576.170 LINK
1.3643%
17
LATOKEN
LINK-USDT$24.56
0.0070703 Eth
$7,798,197.00
317,552.856 LINK
1.2949%
18
Kraken
LINK-USD$24.55
0.0070663 Eth
$7,365,481.00
300,046.490 LINK
1.2235%
19
KuCoin
LINK-USDT$24.54
0.0070634 Eth
$6,673,981.00
271,989.210 LINK
1.1091%
20
QMall
LINK-USDT$24.56
0.0070715 Eth
$6,636,379.00
265,334.005 LINK
1.0820%
21
Dex-Trade
LINK-USDT$24.57
0.0070698 Eth
$5,370,382.00
218,573.580 LINK
0.8913%
22
Hotcoin
LINK-USDT$24.54
0.0070634 Eth
$3,815,739.00
155,504.740 LINK
0.6341%
23
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$24.63
0.0070909 Eth
$3,576,518.00
142,415.676 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.5807%
24
Bitvavo
LINK-EUR$24.60
0.0070826 Eth
$3,433,335.00
139,545.455 LINK
0.5690%
25
Bitstamp
LINK-USD$24.55
0.0070672 Eth
$2,984,333.00
121,561.441 LINK
0.4957%
26
Dcoin
LINK-USDT$24.58
0.0070766 Eth
$2,873,839.00
116,923.000 LINK
0.4768%
27
PointPay
LINK-USDT$24.53
0.0070724 Eth
$2,690,814.00
107,621.328 LINK
0.4389%
28
CoinEx
LINK-USDT$24.54
0.0070637 Eth
$2,685,959.00
107,377.936 LINK
0.4379%
29
EXMO
LINK-USDT$24.57
0.0070730 Eth
$2,495,526.00
101,567.723 LINK
0.4142%
30
Coinbase Exchange
LINK-EUR$24.59
0.0070805 Eth
$2,140,662.00
87,038.830 LINK
0.3549%
31
WhiteBIT
LINK-BTC$24.53
0.0070643 Eth
$1,957,410.00
79,786.160 LINK
0.3253%
32
WhiteBIT
LINK-TRY$24.67
0.0071052 Eth
$1,865,435.00
75,616.460 LINK
0.3083%
33
Phemex
LINK-USDT$24.56
0.0070703 Eth
$1,648,538.00
67,129.530 LINK
0.2737%
34
Bitstamp
LINK-EUR$24.59
0.0070800 Eth
$1,557,052.00
63,309.397 LINK
0.2582%
35
BitStorage
LINK-USDT$24.55
0.0070680 Eth
$1,302,022.00
53,037.820 LINK
0.2163%
36
tanX
LINK-USDC$24.57
0.0070736 Eth
$1,292,545.00
51,804.760 LINK
0.2112%
37
EarnBIT
LINK-USDT$24.55
0.0070668 Eth
$1,208,011.00
48,242.868 LINK
0.1967%
38
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$24.61
0.0070845 Eth
$1,185,039.00
47,376.370 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1932%
39
Binance
LINK-TRY$24.71
0.0071124 Eth
$1,040,565.00
41,374.200 LINK
0.1687%
40
Bitbank
LINK-JPY$24.55
0.0070689 Eth
$1,020,924.00
41,578.586 LINK
0.1695%
41
Coinbase Exchange
LINK-USDT$24.49
0.0070493 Eth
$1,013,857.00
41,402.447 LINK
0.1688%
42
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$24.64
0.0070939 Eth
$1,007,811.00
40,123.675 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.1636%
43
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$24.53
0.0070616 Eth
$912,444.00
36,882.702 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1504%
44
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$24.59
0.0070783 Eth
$820,375.00
832,253.614 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
3.3937%
45
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$24.64
0.0070914 Eth
$816,822.00
32,638.411 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1331%
46
WhiteBIT
LINK-EUR$24.58
0.0070771 Eth
$724,675.00
29,482.590 LINK
0.1202%
47
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$24.64
0.0070932 Eth
$687,427.00
48,739.826 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.1987%
48
Coinbase Exchange
LINK-ETH$24.52
0.0070584 Eth
$649,526.00
26,494.170 LINK
0.1080%
49
BigONE
LINK-USDT$24.44
0.0070488 Eth
$624,983.00
25,571.170 LINK
0.1043%
50
Azbit
LINK-ETH$24.55
0.0070684 Eth
$619,018.00
24,963.327 LINK
0.1018%
51
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$24.68
0.0071057 Eth
$603,729.00
24,048.587 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0981%
52
HashKey Exchange
LINK-USD$24.56
0.0070719 Eth
$552,152.00
22,118.164 LINK
0.0902%
53
KuCoin
LINK-USDC$24.51
0.0070562 Eth
$533,362.00
21,758.621 LINK
0.0887%
54
Gemini
LINK-USD$24.59
0.0070776 Eth
$502,037.00
20,419.482 LINK
0.0833%
55
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$24.60
0.0070828 Eth
$454,606.00
462,227.437 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
1.8849%
56
Slex
LINK-ETH$24.56
0.0070728 Eth
$441,458.00
17,761.190 LINK
0.0724%
57
GMO Japan
LINK-JPY$24.48
0.0070485 Eth
$426,891.00
17,437.400 LINK
0.0711%
58
BitMart
LINK-BTC$24.56
0.0070709 Eth
$393,046.00
16,005.080 LINK
0.0653%
59
DeGate
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$24.55
0.0070679 Eth
$377,694.00
15,124.565 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0617%
60
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$24.63
0.0070909 Eth
$358,612.00
364,798.928 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
1.4876%
61
Coinbase Exchange
LINK-BTC$24.53
0.0070606 Eth
$335,758.00
13,688.640 LINK
0.0558%
62
BitDelta
LINK-USDT$24.55
0.0070679 Eth
$322,761.00
12,940.000 LINK
0.0528%
63
LATOKEN
LINK-BTC$24.54
0.0070666 Eth
$292,426.00
11,915.025 LINK
0.0486%
64
Binance US
LINK-USDT$24.58
0.0070762 Eth
$256,115.00
10,421.078 LINK
0.0425%
65
Bitkub
LINK-THB$24.60
0.0070827 Eth
$252,867.00
10,279.015 LINK
0.0419%
66
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$24.54
0.0070641 Eth
$245,523.00
9,829.851 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0401%
67
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$24.51
0.0070556 Eth
$239,551.00
9,689.216 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0395%
68
PointPay
LINK-BTC$24.55
0.0070703 Eth
$219,259.00
8,679.108 LINK
0.0354%
69
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$24.64
0.0070930 Eth
$215,992.00
8,598.780 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0351%
70
BitMart
LINK-ETH$24.56
0.0070727 Eth
$213,110.00
8,675.760 LINK
0.0354%
71
BitStorage
LINK-ETH$24.56
0.0070697 Eth
$203,928.00
8,304.330 LINK
0.0339%
72
BTCMarkets
LINK-AUD$24.61
0.0070844 Eth
$195,242.00
7,934.747 LINK
0.0324%
73
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$24.55
0.0070677 Eth
$181,841.00
7,240.717 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0295%
74
KuCoin
LINK-BTC$24.50
0.0070527 Eth
$179,569.00
7,329.187 LINK
0.0299%
75
Hotcoin
LINK-BTC$24.53
0.0070739 Eth
$137,789.00
5,616.250 LINK
0.0229%
76
Bitso
LINK-USD$24.53
0.0070633 Eth
$136,670.00
5,570.994 LINK
0.0227%
77
Kanga
LINK-PLN$24.57
0.0070755 Eth
$120,596.00
0.000 LINK
0.0000%
78
EXMO
LINK-BTC$24.80
0.0071386 Eth
$93,275.00
3,761.360 LINK
0.0153%
79
PancakeSwap (v2)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$24.53
0.0070634 Eth
$91,860.00
3,655.354 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0149%
80
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$24.63
0.0070909 Eth
$85,062.00
3,367.780 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0137%
81
Bitexen
LINK-TRY$24.41
0.0070276 Eth
$62,597.00
2,563.937 LINK
0.0105%
82
THENA FUSION
0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$24.57
0.0070717 Eth
$62,378.00
83.481 0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827
0.0003%
83
Nonkyc.io
LINK-BTC$24.65
0.0070975 Eth
$59,934.00
2,387.970 LINK
0.0097%
84
Hotcoin
LINK-ETH$24.54
0.0070746 Eth
$46,951.00
1,913.650 LINK
0.0078%
85
Independent Reserve
LINK-AUD$24.63
0.0070914 Eth
$45,198.00
1,835.131 LINK
0.0075%
86
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XDAC17F958D2EE523A2206206994597C13D831EC7$24.57
0.0070716 Eth
$41,719.00
1,682.165 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0069%
87
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XD6DF932A45C0F255F85145F286EA0B292B21C90B$24.61
0.0070845 Eth
$40,219.00
1,637.530 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0067%
88
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$24.51
0.0070573 Eth
$29,323.00
1,168.714 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0048%
89
Uniswap V3 (Avalanche)
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$24.58
0.0070743 Eth
$25,705.00
1,042.141 0X5947BB275C521040051D82396192181B413227A3
0.0042%
90
Gemini
LINK-BTC$24.50
0.0070527 Eth
$25,502.00
1,040.910 LINK
0.0042%
91
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X1BFD67037B42CF73ACF2047067BD4F2C47D9BFD6$24.66
0.0071000 Eth
$24,886.00
986.570 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0040%
92
Binance US
LINK-BTC$24.57
0.0070753 Eth
$24,238.00
986.355 LINK
0.0040%
93
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$24.67
0.0071036 Eth
$23,490.00
933.133 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0038%
94
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$24.61
0.0070834 Eth
$17,375.30
693.558 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0028%
95
Biswap V3
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$24.57
0.0070714 Eth
$17,172.03
682.837 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0028%
96
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$24.63
0.0070892 Eth
$15,030.43
15,292.802 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.0624%
97
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X55D398326F99059FF775485246999027B3197955$24.55
0.0070687 Eth
$12,118.87
484.542 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0020%
98
LFJ
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$24.53
0.0070633 Eth
$10,692.25
432.761 0X5947BB275C521040051D82396192181B413227A3
0.0018%
99
KuCoin
LINK-KCS$24.52
0.0070578 Eth
$9,936.54
405.268 LINK
0.0017%
100
Ace
LINK-USDT$24.52
0.0070637 Eth
$6,277.64
251.230 LINK
0.0010%

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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