ETH Price: $2,604.77 (-1.94%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

720,892 ( -0.093%)

Market

Price

$12.00 @ 0.004607 ETH (-4.55%)

Onchain Market Cap

$12,000,000,000.00

Circulating Supply Market Cap

$7,523,369,629.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
78.80709325 LINK

Value
$945.69 ( ~0.363061373232038 Eth) [0.0000%]
0xf8B1906Ed0f3De8380C020204Ff6112A1314FA4F
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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 10809.09% |ETH 0.0003846 1097.87%

Market

Volume (24H):$389,237,033.00
Market Capitalization:$7,523,369,629.00
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$12.01
0.0045978 Eth
$36,970,067.00
3,079,063.570 LINK
17.4644%
2
Binance
LINK-USDT$11.99
0.0045941 Eth
$24,566,382.00
2,018,149.310 LINK
11.4469%
3
WhiteBIT
LINK-USDT$11.98
0.0045875 Eth
$16,629,482.00
1,388,042.210 LINK
7.8730%
4
Coinbase Exchange
LINK-USD$11.97
0.0045833 Eth
$16,098,860.00
1,344,821.630 LINK
7.6278%
5
Bybit
LINK-USDT$11.97
0.0045854 Eth
$14,650,806.00
1,205,020.536 LINK
6.8349%
6
HTX
LINK-USDT$11.97
0.0045856 Eth
$12,882,130.00
1,060,535.039 LINK
6.0153%
7
Bitget
LINK-USDT$11.96
0.0045824 Eth
$8,828,232.00
725,830.402 LINK
4.1169%
8
WEEX
LINK-USDT$12.00
0.0045928 Eth
$6,453,582.00
530,048.280 LINK
3.0064%
9
P2B
LINK-USDT$12.01
0.0045978 Eth
$4,812,502.00
400,810.740 LINK
2.2734%
10
Biconomy.com
LINK-USDT$12.00
0.0045928 Eth
$4,803,553.00
395,077.343 LINK
2.2409%
11
Slex
LINK-USDT$12.01
0.0045966 Eth
$4,209,008.00
345,693.170 LINK
1.9608%
12
Azbit
LINK-USDT$11.98
0.0045919 Eth
$4,124,258.00
339,037.170 LINK
1.9230%
13
OKX
LINK-USDT$11.95
0.0045800 Eth
$4,047,109.00
333,156.103 LINK
1.8897%
14
Trubit
LINK-USDT$11.97
0.0045842 Eth
$3,153,840.00
259,022.280 LINK
1.4692%
15
DigiFinex
LINK-USDT$11.96
0.0045810 Eth
$3,124,445.00
261,330.150 LINK
1.4823%
16
Upbit
LINK-KRW$12.02
0.0046037 Eth
$3,097,396.00
257,790.159 LINK
1.4622%
17
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$11.99
0.0045893 Eth
$2,921,768.00
241,021.542 0X514910771AF9CA656AF840DFF83E8264ECF986CA
1.3671%
18
KuCoin
LINK-USDT$11.98
0.0045865 Eth
$2,509,406.00
209,500.693 LINK
1.1883%
19
Gate.io
LINK-USDT$11.96
0.0045813 Eth
$2,468,159.00
202,542.540 LINK
1.1488%
20
ProBit Global
LINK-USDT$11.99
0.0045920 Eth
$2,449,142.00
204,188.777 LINK
1.1582%
21
XT.COM
LINK-USDT$11.97
0.0045829 Eth
$2,283,519.00
187,661.690 LINK
1.0644%
22
CoinW
LINK-USDT$12.01
0.0045976 Eth
$1,844,587.00
153,599.690 LINK
0.8712%
23
Coinstore
LINK-USDT$12.00
0.0045948 Eth
$1,840,854.00
151,219.720 LINK
0.8577%
24
WhiteBIT
LINK-BTC$11.98
0.0045858 Eth
$1,839,760.00
153,620.040 LINK
0.8713%
25
AscendEX (BitMax)
LINK-USDT$11.98
0.0045891 Eth
$1,754,482.00
146,484.800 LINK
0.8309%
26
Kraken
LINK-USD$12.00
0.0045933 Eth
$1,678,895.00
139,958.325 LINK
0.7938%
27
Bitvavo
LINK-EUR$11.96
0.0045785 Eth
$1,238,975.00
103,599.507 LINK
0.5876%
28
Kraken
LINK-USDT$12.03
0.0046079 Eth
$1,154,054.00
95,901.746 LINK
0.5440%
29
BYDFi
LINK-USDT$12.00
0.0045953 Eth
$1,148,667.00
95,734.850 LINK
0.5430%
30
Bitexen
LINK-TRY$11.98
0.0045889 Eth
$1,108,345.00
92,495.850 LINK
0.5246%
31
FMCPAY
LINK-USDT$11.97
0.0045829 Eth
$1,088,725.00
89,468.527 LINK
0.5075%
32
Bitexen
LINK-USDT$11.97
0.0045849 Eth
$957,629.00
79,987.480 LINK
0.4537%
33
Dex-Trade
LINK-USDT$11.95
0.0045782 Eth
$802,255.00
67,141.440 LINK
0.3808%
34
Azbit
LINK-ETH$11.99
0.0045938 Eth
$784,177.00
64,752.647 LINK
0.3673%
35
HashKey Global
LINK-USDT$12.00
0.0045925 Eth
$684,849.00
57,211.612 LINK
0.3245%
36
Bybit
LINK-USDC$11.98
0.0045869 Eth
$649,117.00
53,443.910 LINK
0.3031%
37
BigONE
LINK-USDT$11.94
0.0045695 Eth
$645,350.00
54,072.080 LINK
0.3067%
38
tanX
LINK-USDC$11.98
0.0045894 Eth
$631,825.00
51,761.080 LINK
0.2936%
39
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$11.98
0.0045892 Eth
$625,112.00
52,617.864 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.2984%
40
Bithumb
LINK-KRW$12.03
0.0046057 Eth
$619,450.00
51,490.476 LINK
0.2921%
41
FMCPAY
LINK-BTC$11.97
0.0045835 Eth
$611,743.00
50,701.900 LINK
0.2876%
42
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$11.95
0.0045746 Eth
$486,364.00
40,203.000 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.2280%
43
ProBit Global
LINK-BTC$11.99
0.0045910 Eth
$474,414.00
39,561.007 LINK
0.2244%
44
CoinEx
LINK-USDT$12.00
0.0045946 Eth
$451,649.00
37,173.075 LINK
0.2108%
45
Gemini
LINK-USD$11.98
0.0045887 Eth
$444,472.00
37,113.048 LINK
0.2105%
46
WhiteBIT
LINK-EUR$11.94
0.0045720 Eth
$420,024.00
35,182.040 LINK
0.1996%
47
EXMO
LINK-USDT$12.00
0.0045944 Eth
$402,768.00
33,561.713 LINK
0.1904%
48
PointPay
LINK-USDT$11.98
0.0045867 Eth
$390,098.00
32,104.107 LINK
0.1821%
49
FMCPAY
LINK-ETH$11.97
0.0045857 Eth
$385,478.00
31,890.880 LINK
0.1809%
50
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$11.93
0.0045713 Eth
$363,800.00
29,979.990 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.1700%
51
itBit
LINK-USD$11.99
0.0045940 Eth
$336,330.00
28,050.887 LINK
0.1591%
52
LATOKEN
LINK-USDT$11.99
0.0045897 Eth
$329,070.00
27,448.718 LINK
0.1557%
53
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$12.03
0.0046071 Eth
$306,133.00
25,330.100 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1437%
54
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$12.00
0.0045933 Eth
$305,751.00
25,213.353 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1430%
55
Phemex
LINK-USDT$12.01
0.0045967 Eth
$257,860.00
21,476.090 LINK
0.1218%
56
LATOKEN
LINK-BTC$11.99
0.0045918 Eth
$211,592.00
17,641.574 LINK
0.1001%
57
Nonkyc.io
LINK-USDT$12.03
0.0046057 Eth
$211,572.00
17,365.728 LINK
0.0985%
58
BitMart
LINK-BTC$12.00
0.0045950 Eth
$182,080.00
15,173.040 LINK
0.0861%
59
BitDelta
LINK-USDT$12.00
0.0045938 Eth
$148,530.00
12,216.000 LINK
0.0693%
60
BYDFi
LINK-USDC$11.98
0.0045921 Eth
$141,597.00
11,819.180 LINK
0.0670%
61
Coinbase Exchange
LINK-GBP$11.97
0.0045830 Eth
$125,599.00
10,492.510 LINK
0.0595%
62
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$12.03
0.0046067 Eth
$122,142.00
10,167.849 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0577%
63
Bitci TR
LINK-TRY$12.06
0.0046162 Eth
$113,614.00
9,340.476 LINK
0.0530%
64
Slex
LINK-BTC$12.00
0.0045957 Eth
$105,092.00
8,703.300 LINK
0.0494%
65
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$11.95
0.0045734 Eth
$84,563.00
86,012.232 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.4879%
66
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$11.98
0.0045856 Eth
$76,666.00
6,352.228 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0360%
67
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$11.97
0.0045819 Eth
$69,732.00
5,839.525 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0331%
68
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$11.96
0.0045799 Eth
$69,044.00
70,421.146 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.3994%
69
Bitso
LINK-USD$12.02
0.0046007 Eth
$68,270.00
5,681.051 LINK
0.0322%
70
Slex
LINK-ETH$11.99
0.0045896 Eth
$67,672.00
5,576.630 LINK
0.0316%
71
WhiteBIT
LINK-TRY$12.02
0.0046019 Eth
$66,677.00
5,547.260 LINK
0.0315%
72
Coinbase Exchange
LINK-ETH$11.99
0.0045893 Eth
$65,401.00
5,456.070 LINK
0.0309%
73
PointPay
LINK-BTC$11.99
0.0045933 Eth
$64,382.00
5,335.860 LINK
0.0303%
74
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$11.99
0.0045893 Eth
$54,557.00
4,453.787 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0253%
75
Bitget
LINK-EUR$11.99
0.0045948 Eth
$52,117.00
4,279.510 LINK
0.0243%
76
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$11.96
0.0045799 Eth
$49,714.00
4,072.070 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0231%
77
Binance US
LINK-USDT$12.00
0.0045929 Eth
$44,510.00
3,710.149 LINK
0.0210%
78
Mercado Bitcoin
LINK-BRL$12.00
0.0045928 Eth
$44,454.00
3,705.821 LINK
0.0210%
79
OKX
LINK-USDC$11.98
0.0045918 Eth
$43,251.00
3,573.872 LINK
0.0203%
80
EXMO
LINK-BTC$11.98
0.0045874 Eth
$37,949.00
3,167.978 LINK
0.0180%
81
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$11.98
0.0045865 Eth
$36,967.00
37,606.203 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.2133%
82
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$11.95
0.0045746 Eth
$34,086.00
2,801.339 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0159%
83
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$11.99
0.0045927 Eth
$32,928.00
2,704.231 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0153%
84
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$11.96
0.0045780 Eth
$14,633.90
1,213.674 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0069%
85
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$11.95
0.0045746 Eth
$9,139.03
9,301.758 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.0528%
86
Korbit
LINK-KRW$12.06
0.0046182 Eth
$6,477.11
534.132 LINK
0.0030%
87
Ramses V2
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$11.97
0.0045830 Eth
$4,659.77
386.307 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0022%
88
CoinEx
LINK-USDC$12.04
0.0046087 Eth
$4,483.08
370.467 LINK
0.0021%
89
CoinEx
LINK-BTC$11.93
0.0045691 Eth
$3,087.56
256.244 LINK
0.0015%
90
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$11.98
0.0045854 Eth
$2,387.68
195.471 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0011%
91
PancakeSwap V3 (Arbitrum)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$11.95
0.0045752 Eth
$1,886.67
156.054 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0009%
92
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$12.03
0.0046037 Eth
$1,386.09
114.042 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0006%
93
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X8AC76A51CC950D9822D68B83FE1AD97B32CD580D$12.05
0.0046125 Eth
$1,089.48
88.692 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0005%
94
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X61299774020DA444AF134C82FA83E3810B309991$11.97
0.0045831 Eth
$1,037.60
84.584 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0005%
95
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$12.05
0.0046125 Eth
$822.71
68.229 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0004%
96
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$11.99
0.0045889 Eth
$793.47
64.155 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0004%
97
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$11.97
0.0045809 Eth
$481.13
488.659 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.0028%
98
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0XDA10009CBD5D07DD0CECC66161FC93D7C9000DA1$11.95
0.0045761 Eth
$450.52
37.794 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0002%
99
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$11.98
0.0045918 Eth
$352.41
28.913 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0002%
100
Solidly V3 (Arbitrum)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$11.98
0.0045864 Eth
$185.66
15.377 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
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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