ETH Price: $3,487.92 (-0.09%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

727,308 ( 0.027%)

Market

Price

$24.45 @ 0.007010 ETH (-4.65%)

Onchain Market Cap

$24,450,000,000.00

Circulating Supply Market Cap

$15,391,687,711.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
0 LINK

Value
$0.00
0x69af548b29114ccfbf2042c0351d5c034deb4430
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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 22127.27% |ETH 0.0003846 1722.67%

Market

Volume (24H):$1,064,926,550.00
Market Capitalization:$15,391,687,711.00
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$24.38
0.0070131 Eth
$120,527,457.00
4,853,877.960 LINK
24.8826%
2
Bybit
LINK-USDT$24.37
0.0069882 Eth
$29,121,904.00
1,173,344.396 LINK
6.0149%
3
Coinbase Exchange
LINK-USD$24.41
0.0069969 Eth
$28,890,424.00
1,183,645.700 LINK
6.0678%
4
CoinW
LINK-USDT$24.37
0.0070068 Eth
$25,636,500.00
1,051,931.940 LINK
5.3925%
5
Slex
LINK-USDT$24.32
0.0070040 Eth
$24,686,528.00
997,002.250 LINK
5.1110%
6
P2B
LINK-USDT$24.42
0.0070004 Eth
$24,667,463.00
1,010,122.440 LINK
5.1782%
7
OKX
LINK-USDT$24.40
0.0069933 Eth
$19,641,979.00
791,229.279 LINK
4.0561%
8
DigiFinex
LINK-USDT$24.42
0.0070011 Eth
$15,175,383.00
621,505.290 LINK
3.1860%
9
XT.COM
LINK-USDT$24.37
0.0070070 Eth
$12,526,852.00
504,169.230 LINK
2.5845%
10
Azbit
LINK-USDT$24.45
0.0070304 Eth
$12,029,686.00
484,365.685 LINK
2.4830%
11
HTX
LINK-USDT$24.36
0.0069838 Eth
$11,322,708.00
457,274.417 LINK
2.3441%
12
Coinstore
LINK-USDT$24.37
0.0070035 Eth
$10,782,345.00
434,631.610 LINK
2.2281%
13
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$24.44
0.0070209 Eth
$10,471,320.00
422,857.861 0X514910771AF9CA656AF840DFF83E8264ECF986CA
2.1677%
14
BTSE
LINK-USDT$24.42
0.0070295 Eth
$10,410,935.00
426,411.126 LINK
2.1859%
15
Bitunix
LINK-USDT$24.42
0.0070136 Eth
$9,399,574.00
384,823.910 LINK
1.9727%
16
Binance
LINK-FDUSD$24.39
0.0070120 Eth
$8,156,126.00
328,807.440 LINK
1.6856%
17
Biconomy.com
LINK-USDT$24.38
0.0070086 Eth
$7,360,996.00
297,080.630 LINK
1.5229%
18
BYDFi
LINK-USDT$24.43
0.0070024 Eth
$7,087,892.00
290,161.210 LINK
1.4875%
19
LATOKEN
LINK-USDT$24.37
0.0069861 Eth
$5,648,174.00
231,764.536 LINK
1.1881%
20
Kraken
LINK-USD$24.42
0.0069997 Eth
$5,157,643.00
211,220.935 LINK
1.0828%
21
KuCoin
LINK-USDT$24.38
0.0069889 Eth
$4,166,173.00
170,883.425 LINK
0.8760%
22
Coinbase Exchange
LINK-GBP$24.31
0.0069900 Eth
$3,925,189.00
161,436.470 LINK
0.8276%
23
Dex-Trade
LINK-USDT$24.36
0.0070154 Eth
$3,918,937.00
160,880.070 LINK
0.8247%
24
Hotcoin
LINK-USDT$24.41
0.0070105 Eth
$3,556,418.00
145,714.530 LINK
0.7470%
25
Dcoin
LINK-USDT$24.34
0.0070084 Eth
$2,600,948.00
106,860.000 LINK
0.5478%
26
Bitvavo
LINK-EUR$24.41
0.0070112 Eth
$2,278,579.00
93,360.051 LINK
0.4786%
27
EXMO
LINK-USDT$24.47
0.0070146 Eth
$1,965,893.00
80,332.742 LINK
0.4118%
28
PointPay
LINK-USDT$24.43
0.0070151 Eth
$1,902,684.00
76,759.863 LINK
0.3935%
29
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$24.69
0.0070940 Eth
$1,632,898.00
64,983.063 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.3331%
30
CoinEx
LINK-USDT$24.36
0.0069965 Eth
$1,470,056.00
59,470.699 LINK
0.3049%
31
WhiteBIT
LINK-BTC$24.41
0.0069988 Eth
$1,270,102.00
52,033.800 LINK
0.2667%
32
Phemex
LINK-USDT$24.37
0.0069856 Eth
$1,240,337.00
50,898.500 LINK
0.2609%
33
tanX
LINK-USDC$24.36
0.0069987 Eth
$1,212,902.00
48,941.620 LINK
0.2509%
34
Coinbase Exchange
LINK-EUR$24.36
0.0070010 Eth
$1,198,170.00
49,178.500 LINK
0.2521%
35
BitStorage
LINK-USDT$24.40
0.0070270 Eth
$950,941.00
38,969.970 LINK
0.1998%
36
Bitbank
LINK-JPY$24.36
0.0070039 Eth
$923,082.00
37,892.181 LINK
0.1942%
37
Bitstamp
LINK-USD$24.35
0.0069802 Eth
$873,867.00
35,887.753 LINK
0.1840%
38
EarnBIT
LINK-USDT$24.38
0.0070016 Eth
$865,785.00
34,920.383 LINK
0.1790%
39
Bitstamp
LINK-EUR$24.43
0.0070040 Eth
$714,336.00
29,236.300 LINK
0.1499%
40
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$24.32
0.0069847 Eth
$695,755.00
28,210.624 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.1446%
41
Coinbase Exchange
LINK-ETH$24.47
0.0070134 Eth
$685,967.00
28,037.930 LINK
0.1437%
42
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$24.34
0.0069900 Eth
$683,647.00
27,542.561 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1412%
43
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$24.32
0.0069717 Eth
$670,852.00
684,339.807 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
3.5082%
44
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$24.34
0.0069927 Eth
$570,771.00
23,254.288 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1192%
45
Bybit
LINK-USDC$24.39
0.0069934 Eth
$570,178.00
23,009.850 LINK
0.1180%
46
BigONE
LINK-USDT$24.27
0.0069743 Eth
$566,457.00
23,343.000 LINK
0.1197%
47
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$24.40
0.0069955 Eth
$512,566.00
20,553.188 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1054%
48
HashKey Exchange
LINK-USD$24.42
0.0070005 Eth
$455,300.00
18,322.462 LINK
0.0939%
49
Slex
LINK-ETH$24.37
0.0070073 Eth
$439,671.00
17,763.010 LINK
0.0911%
50
Coinbase Exchange
LINK-USDT$24.34
0.0069946 Eth
$434,394.00
17,848.895 LINK
0.0915%
51
Gemini
LINK-USD$24.44
0.0070060 Eth
$414,143.00
16,945.288 LINK
0.0869%
52
Binance
LINK-EUR$24.38
0.0069908 Eth
$405,739.00
16,346.970 LINK
0.0838%
53
GMO Japan
LINK-JPY$24.52
0.0070429 Eth
$383,494.00
15,642.300 LINK
0.0802%
54
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$24.52
0.0070436 Eth
$383,080.00
27,442.051 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.1407%
55
itBit
LINK-USD$24.40
0.0069940 Eth
$379,966.00
15,572.362 LINK
0.0798%
56
BitMart
LINK-BTC$24.42
0.0069989 Eth
$343,687.00
14,075.720 LINK
0.0722%
57
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$24.30
0.0069799 Eth
$343,594.00
351,104.502 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
1.7999%
58
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$24.53
0.0070469 Eth
$319,005.00
12,794.398 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0656%
59
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$24.69
0.0070931 Eth
$302,493.00
305,850.651 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
1.5679%
60
KuCoin
LINK-USDC$24.46
0.0070129 Eth
$301,923.00
12,341.582 LINK
0.0633%
61
DeGate
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$24.40
0.0070080 Eth
$300,404.00
12,111.827 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0621%
62
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$24.66
0.0070688 Eth
$287,983.00
11,527.654 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0591%
63
Coinbase Exchange
LINK-BTC$24.38
0.0070016 Eth
$264,082.00
10,833.770 LINK
0.0555%
64
Bitci TR
LINK-TRY$24.72
0.0071083 Eth
$251,257.00
10,089.040 LINK
0.0517%
65
BitMart
LINK-ETH$24.43
0.0070019 Eth
$185,067.00
7,576.800 LINK
0.0388%
66
LATOKEN
LINK-BTC$24.37
0.0070045 Eth
$181,383.00
7,442.329 LINK
0.0382%
67
Bitkub
LINK-THB$24.31
0.0069676 Eth
$179,924.00
7,401.838 LINK
0.0379%
68
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$24.36
0.0069971 Eth
$168,279.00
6,773.749 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0347%
69
BitStorage
LINK-ETH$24.42
0.0070222 Eth
$167,731.00
6,867.590 LINK
0.0352%
70
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$24.40
0.0070074 Eth
$156,105.00
6,286.388 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0322%
71
Binance US
LINK-USDT$24.40
0.0069937 Eth
$140,403.00
5,754.819 LINK
0.0295%
72
PointPay
LINK-BTC$24.36
0.0069959 Eth
$129,593.00
5,205.654 LINK
0.0267%
73
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$24.34
0.0069907 Eth
$126,373.00
5,145.510 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0264%
74
Hotcoin
LINK-BTC$24.33
0.0070067 Eth
$120,647.00
4,957.990 LINK
0.0254%
75
Kraken
LINK-GBP$24.40
0.0069953 Eth
$106,316.00
4,356.719 LINK
0.0223%
76
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$24.52
0.0070278 Eth
$87,882.00
3,510.466 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0180%
77
Bitso
LINK-USD$24.36
0.0069830 Eth
$83,482.00
3,427.063 LINK
0.0176%
78
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$24.30
0.0069799 Eth
$81,766.00
3,293.829 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0169%
79
PancakeSwap (v2)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$24.34
0.0069908 Eth
$62,706.00
2,530.198 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0130%
80
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$24.45
0.0070100 Eth
$54,557.00
2,192.285 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0112%
81
Bitexen
LINK-TRY$24.28
0.0069922 Eth
$48,759.00
2,008.096 LINK
0.0103%
82
Hotcoin
LINK-ETH$24.42
0.0070009 Eth
$41,806.00
1,711.830 LINK
0.0088%
83
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$24.61
0.0070699 Eth
$37,315.00
1,490.810 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0076%
84
THENA FUSION
0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$24.36
0.0069817 Eth
$37,230.00
49.774 0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827
0.0003%
85
Bitstamp
LINK-BTC$24.51
0.0070262 Eth
$35,450.00
1,446.306 LINK
0.0074%
86
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XDAC17F958D2EE523A2206206994597C13D831EC7$24.52
0.0070436 Eth
$31,788.00
1,288.910 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0066%
87
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XD6DF932A45C0F255F85145F286EA0B292B21C90B$24.60
0.0070659 Eth
$25,256.00
1,039.282 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0053%
88
Gemini
LINK-BTC$24.29
0.0069628 Eth
$16,070.75
661.631 LINK
0.0034%
89
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X1BFD67037B42CF73ACF2047067BD4F2C47D9BFD6$24.45
0.0070227 Eth
$15,576.14
625.656 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0032%
90
Uniswap V3 (Avalanche)
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$24.64
0.0070634 Eth
$15,522.55
634.899 0X5947BB275C521040051D82396192181B413227A3
0.0033%
91
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$24.40
0.0070102 Eth
$15,517.61
624.578 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0032%
92
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$24.30
0.0069808 Eth
$12,387.56
499.334 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0026%
93
Biswap V3
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$24.34
0.0069777 Eth
$10,428.57
419.771 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0022%
94
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XD93F7E271CB87C23AAA73EDC008A79646D1F9912$24.53
0.0070466 Eth
$10,328.40
412.577 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0021%
95
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$24.66
0.0070937 Eth
$10,294.60
10,424.821 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.0534%
96
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$24.69
0.0070954 Eth
$9,537.07
381.143 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0020%
97
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X55D398326F99059FF775485246999027B3197955$24.42
0.0070141 Eth
$7,709.24
310.650 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0016%
98
KuCoin
LINK-KCS$24.61
0.0070549 Eth
$6,955.93
282.641 LINK
0.0014%
99
PancakeSwap (v2)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X55D398326F99059FF775485246999027B3197955$24.35
0.0069985 Eth
$4,835.37
137.530 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0007%
100
Ace
LINK-USDT$24.34
0.0069937 Eth
$4,723.21
190.200 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:
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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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