ETH Price: $2,643.22 (+1.18%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

721,840 ( 0.006%)

Market

Price

$11.43 @ 0.004324 ETH (+3.26%)

Onchain Market Cap

$11,430,000,000.00

Circulating Supply Market Cap

$7,167,793,654.00

Other Info

Token Contract (WITH 18 Decimals)

Filtered by Token Holder
mr-apple-pie.eth
Balance
0.020231544605988319 LINK

Value
$0.23 ( ~8.70150092747961E-05 Eth) [0.0000%]
0x3bafd778251b5e6081e3c011a45126be3c85fc55
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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 10290.91% |ETH 0.0003846 1024.28%

Market

Volume (24H):$338,083,196.00
Market Capitalization:$7,167,793,654.00
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
Binance
LINK-USDT$11.44
0.0043289 Eth
$25,384,010.00
2,256,850.270 LINK
14.3999%
2
WhiteBIT
LINK-USDT$11.43
0.0043276 Eth
$14,191,844.00
1,241,275.110 LINK
7.9200%
3
Coinbase Exchange
LINK-USD$11.44
0.0043286 Eth
$14,049,725.00
1,228,444.980 LINK
7.8381%
4
HTX
LINK-USDT$11.44
0.0043310 Eth
$9,227,000.00
822,181.427 LINK
5.2459%
5
Bitget
LINK-USDT$11.45
0.0043326 Eth
$8,817,062.00
785,470.252 LINK
5.0117%
6
Bybit
LINK-USDT$11.45
0.0043281 Eth
$8,739,464.00
777,536.257 LINK
4.9611%
7
P2B
LINK-USDT$11.44
0.0043289 Eth
$5,341,159.00
466,739.160 LINK
2.9780%
8
Azbit
LINK-USDT$11.42
0.0043285 Eth
$4,796,106.00
427,982.660 LINK
2.7308%
9
Slex
LINK-USDT$11.43
0.0043257 Eth
$4,213,975.00
374,791.860 LINK
2.3914%
10
WEEX
LINK-USDT$11.44
0.0043294 Eth
$4,162,724.00
370,407.520 LINK
2.3634%
11
Poloniex
LINK-USDT$11.45
0.0043352 Eth
$4,095,934.00
363,878.700 LINK
2.3217%
12
BTSE
LINK-USDT$11.45
0.0043312 Eth
$3,773,393.00
329,565.937 LINK
2.1028%
13
OKX
LINK-USDT$11.44
0.0043287 Eth
$3,707,354.00
329,616.528 LINK
2.1031%
14
Biconomy.com
LINK-USDT$11.43
0.0043276 Eth
$3,562,953.00
317,541.620 LINK
2.0261%
15
DigiFinex
LINK-USDT$11.45
0.0043309 Eth
$3,283,232.00
286,776.090 LINK
1.8298%
16
FameEX
LINK-USDT$11.42
0.0043300 Eth
$2,622,428.00
232,773.258 LINK
1.4852%
17
Deepcoin
LINK-USDT$11.42
0.0043270 Eth
$2,498,606.00
224,304.300 LINK
1.4312%
18
XT.COM
LINK-USDT$11.42
0.0043273 Eth
$2,297,565.00
204,368.440 LINK
1.3040%
19
CoinW
LINK-USDT$11.42
0.0043252 Eth
$2,236,489.00
195,886.150 LINK
1.2499%
20
Trubit
LINK-USDT$11.43
0.0043311 Eth
$2,223,751.00
197,951.890 LINK
1.2630%
21
Upbit
LINK-KRW$11.37
0.0043018 Eth
$2,188,918.00
192,483.768 LINK
1.2281%
22
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$11.38
0.0043065 Eth
$2,156,022.00
190,570.925 0X514910771AF9CA656AF840DFF83E8264ECF986CA
1.2159%
23
Toobit
LINK-USDT$11.42
0.0043268 Eth
$2,068,831.00
184,061.660 LINK
1.1744%
24
Gate.io
LINK-USDT$11.43
0.0043312 Eth
$2,054,989.00
183,403.640 LINK
1.1702%
25
Bitunix
LINK-USDT$11.44
0.0043313 Eth
$1,889,326.00
165,032.910 LINK
1.0530%
26
KuCoin
LINK-USDT$11.43
0.0043255 Eth
$1,839,315.00
160,979.845 LINK
1.0271%
27
Coinstore
LINK-USDT$11.40
0.0043210 Eth
$1,829,430.00
162,699.520 LINK
1.0381%
28
Bitexen
LINK-TRY$11.44
0.0043349 Eth
$1,802,279.00
157,530.060 LINK
1.0051%
29
AscendEX (BitMax)
LINK-USDT$11.42
0.0043221 Eth
$1,758,781.00
154,026.600 LINK
0.9828%
30
LBank
LINK-USDT$11.37
0.0043166 Eth
$1,755,956.00
154,382.650 LINK
0.9850%
31
C-Patex
LINK-USDT$11.42
0.0043258 Eth
$1,727,295.00
151,310.156 LINK
0.9654%
32
Kraken
LINK-USD$11.44
0.0043289 Eth
$1,587,394.00
138,784.629 LINK
0.8855%
33
Niza Global
LINK-USD$11.44
0.0043237 Eth
$1,545,468.00
138,784.629 LINK
0.8855%
34
Binance
LINK-BTC$11.44
0.0043299 Eth
$1,478,228.00
129,650.050 LINK
0.8272%
35
WhiteBIT
LINK-BTC$11.43
0.0043264 Eth
$1,255,272.00
109,820.670 LINK
0.7007%
36
ProBit Global
LINK-USDT$11.41
0.0043264 Eth
$1,252,674.00
109,746.195 LINK
0.7002%
37
BYDFi
LINK-USDT$11.42
0.0043354 Eth
$1,246,247.00
109,093.730 LINK
0.6961%
38
Oceanex
LINK-USDT$11.44
0.0043294 Eth
$1,154,730.00
100,895.060 LINK
0.6438%
39
HashKey Global
LINK-USDT$11.43
0.0043247 Eth
$1,043,687.00
91,385.292 LINK
0.5831%
40
Crypto.com Exchange
LINK-USDT$11.44
0.0043293 Eth
$942,350.00
82,340.390 LINK
0.5254%
41
Azbit
LINK-ETH$11.42
0.0043285 Eth
$876,996.00
77,604.948 LINK
0.4952%
42
Dex-Trade
LINK-USDT$11.42
0.0043270 Eth
$868,094.00
76,015.390 LINK
0.4850%
43
Bitexen
LINK-USDT$11.42
0.0043263 Eth
$815,628.00
71,433.190 LINK
0.4558%
44
LATOKEN
LINK-USDT$11.42
0.0043284 Eth
$788,876.00
69,080.416 LINK
0.4408%
45
FMFW.io
LINK-USDT$11.43
0.0043303 Eth
$668,130.00
58,467.930 LINK
0.3731%
46
HitBTC
LINK-USDT$11.45
0.0043338 Eth
$656,773.00
58,476.190 LINK
0.3731%
47
AscendEX (BitMax)
LINK-BTC$11.43
0.0043267 Eth
$617,397.00
54,011.300 LINK
0.3446%
48
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$11.43
0.0043294 Eth
$590,633.00
52,322.545 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.3338%
49
BigONE
LINK-USDT$11.45
0.0043387 Eth
$559,390.00
48,856.480 LINK
0.3117%
50
Bithumb
LINK-KRW$11.38
0.0043068 Eth
$519,852.00
45,684.142 LINK
0.2915%
51
Crypto.com Exchange
LINK-USD$11.43
0.0043288 Eth
$510,318.00
44,658.950 LINK
0.2849%
52
Gemini
LINK-USD$11.39
0.0043095 Eth
$471,228.00
41,388.363 LINK
0.2641%
53
PointPay
LINK-USDT$11.42
0.0043284 Eth
$419,392.00
37,294.563 LINK
0.2380%
54
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$11.38
0.0043137 Eth
$411,963.00
36,431.830 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.2325%
55
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$11.44
0.0043321 Eth
$405,621.00
35,744.089 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.2281%
56
MEXC
LINK-USDT$11.43
0.0043311 Eth
$377,651.00
33,041.960 LINK
0.2108%
57
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$11.33
0.0042898 Eth
$363,467.00
32,198.073 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.2054%
58
EXMO
LINK-USDT$11.42
0.0043276 Eth
$351,878.00
30,807.677 LINK
0.1966%
59
LATOKEN
LINK-BTC$11.41
0.0043246 Eth
$296,403.00
25,978.437 LINK
0.1658%
60
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$11.31
0.0042879 Eth
$279,824.00
24,787.827 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.1582%
61
Phemex
LINK-USDT$11.44
0.0043334 Eth
$261,781.00
22,884.810 LINK
0.1460%
62
Bybit
LINK-USDC$11.45
0.0043281 Eth
$210,176.00
18,773.502 LINK
0.1198%
63
BitMart
LINK-BTC$11.43
0.0043309 Eth
$190,691.00
16,687.300 LINK
0.1065%
64
BYDFi
LINK-USDC$11.40
0.0043282 Eth
$159,138.00
13,963.100 LINK
0.0891%
65
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$11.38
0.0043071 Eth
$130,604.00
11,567.425 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0738%
66
BitDelta
LINK-USDT$11.42
0.0043283 Eth
$130,177.00
11,617.000 LINK
0.0741%
67
Coinbase Exchange
LINK-GBP$11.45
0.0043319 Eth
$128,059.00
11,188.520 LINK
0.0714%
68
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$11.38
0.0043137 Eth
$123,868.00
122,892.423 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.7841%
69
Coinbase Exchange
LINK-ETH$11.42
0.0043286 Eth
$123,227.00
10,786.650 LINK
0.0688%
70
Coinbase Exchange
LINK-BTC$11.41
0.0043203 Eth
$115,556.00
10,125.710 LINK
0.0646%
71
Bitci TR
LINK-TRY$11.37
0.0043067 Eth
$112,990.00
10,084.000 LINK
0.0643%
72
HashKey Exchange
LINK-USD$11.47
0.0043464 Eth
$108,408.00
9,477.038 LINK
0.0605%
73
Slex
LINK-BTC$11.44
0.0043295 Eth
$85,756.00
7,525.100 LINK
0.0480%
74
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$11.38
0.0043137 Eth
$68,931.00
6,111.679 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0390%
75
Slex
LINK-ETH$11.43
0.0043269 Eth
$62,668.00
5,534.870 LINK
0.0353%
76
PointPay
LINK-BTC$11.43
0.0043311 Eth
$56,631.00
4,969.534 LINK
0.0317%
77
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$11.48
0.0043482 Eth
$49,906.00
4,414.447 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0282%
78
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$11.32
0.0042883 Eth
$48,015.00
47,604.178 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.3037%
79
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$11.42
0.0043268 Eth
$46,355.00
4,108.042 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0262%
80
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$11.42
0.0043197 Eth
$40,617.00
40,151.211 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.2562%
81
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$11.41
0.0043230 Eth
$29,495.00
2,599.583 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0166%
82
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$11.34
0.0042915 Eth
$28,181.00
2,514.610 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0160%
83
EXMO
LINK-BTC$11.42
0.0043259 Eth
$24,786.00
2,171.000 LINK
0.0139%
84
Bitkub
LINK-THB$11.42
0.0043258 Eth
$23,061.00
2,019.790 LINK
0.0129%
85
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$11.41
0.0043257 Eth
$20,516.00
1,811.089 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0116%
86
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$11.40
0.0043142 Eth
$18,501.72
1,632.846 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0104%
87
KuCoin
LINK-KCS$11.40
0.0043169 Eth
$13,657.50
1,197.705 LINK
0.0076%
88
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$11.40
0.0043187 Eth
$12,663.12
1,118.680 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0071%
89
Coinone
LINK-KRW$11.34
0.0042877 Eth
$10,560.05
930.996 LINK
0.0059%
90
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X1BFD67037B42CF73ACF2047067BD4F2C47D9BFD6$11.44
0.0043345 Eth
$10,076.19
882.648 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0056%
91
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$11.34
0.0042894 Eth
$8,806.79
8,659.337 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.0553%
92
zondacrypto
LINK-PLN$11.43
0.0043328 Eth
$4,176.44
365.354 LINK
0.0023%
93
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$11.39
0.0043145 Eth
$3,053.45
270.286 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0017%
94
PancakeSwap V3 (Arbitrum)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$11.41
0.0043139 Eth
$1,985.73
175.143 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0011%
95
PancakeSwap (v2)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X55D398326F99059FF775485246999027B3197955$11.40
0.0043177 Eth
$1,559.76
94.928 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0006%
96
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$11.42
0.0043241 Eth
$1,249.29
110.863 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0007%
97
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$11.47
0.0043404 Eth
$299.16
26.398 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0002%
98
Balancer V2 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XDF7837DE1F2FA4631D716CF2502F8B230F1DCC32$11.45
0.0043367 Eth
$232.33
20.334 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0001%
99
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X8F3CF7AD23CD3CADBD9735AFF958023239C6A063$11.42
0.0043223 Eth
$136.64
12.190 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0001%
100
CEX.IO
LINK-USDT$11.45
0.0043301 Eth
$34.87
3.054 LINK
0.0000%

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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