ETH Price: $2,645.01 (+0.71%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

721,850 ( 0.001%)

Market

Price

$11.44 @ 0.004325 ETH (+1.10%)

Onchain Market Cap

$11,440,000,000.00

Circulating Supply Market Cap

$7,172,003,246.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
8,265.481953033547851865 LINK

Value
$94,557.11 ( ~35.7492 Eth) [0.0008%]
0xe6ba08ebcf791eb7b3622fc90a69882d37701752
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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 10300% |ETH 0.0003846 1024.54%

Market

Volume (24H):$298,997,235.00
Market Capitalization:$7,172,003,246.00
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$11.46
0.0043322 Eth
$22,447,802.00
1,965,093.270 LINK
14.2649%
2
Coinbase Exchange
LINK-USD$11.44
0.0043258 Eth
$13,107,174.00
1,145,932.320 LINK
8.3185%
3
WhiteBIT
LINK-USDT$11.44
0.0043263 Eth
$11,161,515.00
975,780.230 LINK
7.0834%
4
HTX
LINK-USDT$11.43
0.0043243 Eth
$10,405,497.00
910,334.761 LINK
6.6083%
5
Bitget
LINK-USDT$11.43
0.0043259 Eth
$8,816,127.00
771,598.299 LINK
5.6012%
6
Bybit
LINK-USDT$11.44
0.0043276 Eth
$7,084,682.00
620,214.899 LINK
4.5022%
7
Azbit
LINK-USDT$11.44
0.0043267 Eth
$4,771,011.00
417,525.760 LINK
3.0309%
8
P2B
LINK-USDT$11.45
0.0043302 Eth
$4,668,754.00
407,814.470 LINK
2.9604%
9
FameEX
LINK-USDT$11.43
0.0043246 Eth
$4,661,024.00
406,754.795 LINK
2.9527%
10
WEEX
LINK-USDT$11.44
0.0043267 Eth
$4,251,084.00
371,865.180 LINK
2.6994%
11
Slex
LINK-USDT$11.45
0.0043293 Eth
$3,882,292.00
339,748.980 LINK
2.4663%
12
BTSE
LINK-USDT$11.44
0.0043248 Eth
$3,683,104.00
322,064.019 LINK
2.3379%
13
Biconomy.com
LINK-USDT$11.44
0.0043263 Eth
$3,631,436.00
317,640.790 LINK
2.3058%
14
OKX
LINK-USDT$11.44
0.0043278 Eth
$3,554,115.00
310,612.273 LINK
2.2548%
15
DigiFinex
LINK-USDT$11.44
0.0043280 Eth
$2,911,306.00
254,506.390 LINK
1.8475%
16
Upbit
LINK-KRW$11.37
0.0043028 Eth
$2,754,587.00
242,221.507 LINK
1.7583%
17
Deepcoin
LINK-USDT$11.44
0.0043274 Eth
$2,291,302.00
205,215.560 LINK
1.4897%
18
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$11.43
0.0043232 Eth
$2,267,302.00
197,959.050 0X514910771AF9CA656AF840DFF83E8264ECF986CA
1.4370%
19
XT.COM
LINK-USDT$11.44
0.0043265 Eth
$2,042,579.00
178,817.310 LINK
1.2981%
20
CoinW
LINK-USDT$11.44
0.0043276 Eth
$2,041,377.00
178,474.370 LINK
1.2956%
21
Gate.io
LINK-USDT$11.44
0.0043253 Eth
$1,949,789.00
170,563.060 LINK
1.2381%
22
ProBit Global
LINK-USDT$11.44
0.0043289 Eth
$1,850,194.00
161,695.693 LINK
1.1738%
23
Trubit
LINK-USDT$11.45
0.0043270 Eth
$1,782,535.00
156,145.650 LINK
1.1335%
24
AscendEX (BitMax)
LINK-USDT$11.43
0.0043219 Eth
$1,729,593.00
151,361.000 LINK
1.0988%
25
LBank
LINK-USDT$11.44
0.0043280 Eth
$1,725,017.00
150,801.010 LINK
1.0947%
26
Bitexen
LINK-TRY$11.46
0.0043342 Eth
$1,676,235.00
146,274.410 LINK
1.0618%
27
Bitunix
LINK-USDT$11.43
0.0043243 Eth
$1,671,774.00
146,156.610 LINK
1.0610%
28
Coinstore
LINK-USDT$11.44
0.0043281 Eth
$1,635,921.00
143,188.470 LINK
1.0394%
29
C-Patex
LINK-USDT$11.44
0.0043275 Eth
$1,554,582.00
135,858.824 LINK
0.9862%
30
KuCoin
LINK-USDT$11.44
0.0043262 Eth
$1,464,526.00
128,037.760 LINK
0.9294%
31
Crypto.com Exchange
LINK-USDT$11.44
0.0043283 Eth
$1,167,413.00
102,017.750 LINK
0.7406%
32
BYDFi
LINK-USDT$11.44
0.0043227 Eth
$1,133,246.00
99,070.800 LINK
0.7192%
33
HashKey Global
LINK-USDT$11.44
0.0043266 Eth
$1,043,140.00
91,389.602 LINK
0.6634%
34
WhiteBIT
LINK-BTC$11.45
0.0043291 Eth
$951,666.00
83,144.140 LINK
0.6036%
35
Hotcoin
LINK-USDT$11.43
0.0043238 Eth
$874,705.00
76,542.400 LINK
0.5556%
36
Azbit
LINK-ETH$11.43
0.0043217 Eth
$868,480.00
75,867.731 LINK
0.5507%
37
Bitexen
LINK-USDT$11.45
0.0043289 Eth
$787,470.00
68,802.210 LINK
0.4994%
38
Dex-Trade
LINK-USDT$11.44
0.0043278 Eth
$759,411.00
66,388.400 LINK
0.4819%
39
Bitvavo
LINK-EUR$11.43
0.0043235 Eth
$734,479.00
64,269.509 LINK
0.4665%
40
LATOKEN
LINK-USDT$11.44
0.0043276 Eth
$701,044.00
61,292.333 LINK
0.4449%
41
AscendEX (BitMax)
LINK-BTC$11.39
0.0043079 Eth
$585,458.00
51,401.400 LINK
0.3731%
42
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$11.44
0.0043296 Eth
$556,403.00
48,066.503 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.3489%
43
Bithumb
LINK-KRW$11.40
0.0043119 Eth
$530,115.00
46,495.739 LINK
0.3375%
44
tanX
LINK-USDC$11.46
0.0043303 Eth
$519,988.00
45,523.020 LINK
0.3305%
45
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$11.43
0.0043254 Eth
$452,676.00
39,625.189 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.2876%
46
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$11.41
0.0043149 Eth
$449,891.00
39,480.123 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.2866%
47
BigONE
LINK-USDT$11.50
0.0043475 Eth
$441,937.00
38,434.930 LINK
0.2790%
48
EXMO
LINK-USDT$11.43
0.0043242 Eth
$433,664.00
37,933.456 LINK
0.2754%
49
PointPay
LINK-USDT$11.45
0.0043283 Eth
$373,781.00
32,717.642 LINK
0.2375%
50
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$11.46
0.0043349 Eth
$372,709.00
32,557.132 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.2363%
51
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$11.41
0.0043152 Eth
$319,236.00
27,990.580 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.2032%
52
LATOKEN
LINK-BTC$11.43
0.0043234 Eth
$318,239.00
27,850.488 LINK
0.2022%
53
Gemini
LINK-USD$11.40
0.0043134 Eth
$270,178.00
23,696.919 LINK
0.1720%
54
ProBit Global
LINK-BTC$11.43
0.0043258 Eth
$267,106.00
23,360.095 LINK
0.1696%
55
Phemex
LINK-USDT$11.44
0.0043245 Eth
$255,132.00
22,303.040 LINK
0.1619%
56
itBit
LINK-USD$11.43
0.0043233 Eth
$235,662.00
20,617.856 LINK
0.1497%
57
Bybit
LINK-USDC$11.45
0.0043319 Eth
$210,095.00
18,375.186 LINK
0.1334%
58
BitMart
LINK-BTC$11.44
0.0043271 Eth
$195,809.00
17,119.500 LINK
0.1243%
59
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$11.47
0.0043404 Eth
$177,347.00
15,581.044 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.1131%
60
Hotcoin
LINK-ETH$11.43
0.0043245 Eth
$128,916.00
11,279.140 LINK
0.0819%
61
BitDelta
LINK-USDT$11.44
0.0043274 Eth
$125,570.00
10,994.000 LINK
0.0798%
62
BYDFi
LINK-USDC$11.45
0.0043307 Eth
$123,427.00
10,778.000 LINK
0.0782%
63
Hotcoin
LINK-BTC$11.45
0.0043311 Eth
$122,156.00
10,671.250 LINK
0.0775%
64
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$11.43
0.0043254 Eth
$116,208.00
115,914.103 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.8414%
65
Coinbase Exchange
LINK-GBP$11.45
0.0043306 Eth
$115,997.00
10,134.490 LINK
0.0736%
66
Bitci TR
LINK-TRY$11.51
0.0043524 Eth
$113,496.00
9,923.370 LINK
0.0720%
67
Coinbase Exchange
LINK-ETH$11.43
0.0043218 Eth
$112,667.00
9,858.160 LINK
0.0716%
68
Slex
LINK-BTC$11.44
0.0043251 Eth
$92,410.00
8,072.500 LINK
0.0586%
69
GMO Japan
LINK-JPY$11.51
0.0043532 Eth
$68,269.00
5,931.000 LINK
0.0431%
70
PointPay
LINK-BTC$11.45
0.0043274 Eth
$61,094.00
5,331.478 LINK
0.0387%
71
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$11.43
0.0043254 Eth
$59,636.00
5,232.225 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0380%
72
Slex
LINK-ETH$11.43
0.0043217 Eth
$55,562.00
4,849.830 LINK
0.0352%
73
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$11.43
0.0043239 Eth
$52,368.00
4,527.363 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0329%
74
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$11.41
0.0043149 Eth
$47,973.00
47,847.399 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.3473%
75
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$11.45
0.0043321 Eth
$39,928.00
3,502.511 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0254%
76
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$11.46
0.0043352 Eth
$38,517.00
38,312.495 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.2781%
77
Bitkub
LINK-THB$11.41
0.0043160 Eth
$38,257.00
3,352.286 LINK
0.0243%
78
EXMO
LINK-BTC$11.22
0.0042445 Eth
$33,585.00
2,993.624 LINK
0.0217%
79
Binance US
LINK-USDT$11.47
0.0043389 Eth
$29,107.00
2,538.211 LINK
0.0184%
80
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$11.39
0.0043073 Eth
$27,486.00
2,414.854 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0175%
81
Mercado Bitcoin
LINK-BRL$11.45
0.0043322 Eth
$26,959.00
2,353.503 LINK
0.0171%
82
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$11.43
0.0043250 Eth
$26,661.00
2,334.880 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0169%
83
Bitcointry
LINK-USDT$11.44
0.0043293 Eth
$25,909.00
2,280.089 LINK
0.0166%
84
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$11.44
0.0043289 Eth
$23,125.00
2,025.252 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0147%
85
Bitso
LINK-USD$11.45
0.0043328 Eth
$20,460.00
1,786.591 LINK
0.0130%
86
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$11.43
0.0043229 Eth
$16,936.82
1,484.163 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0108%
87
KuCoin
LINK-KCS$11.44
0.0043267 Eth
$14,915.36
1,303.825 LINK
0.0095%
88
Pangolin
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$11.45
0.0043310 Eth
$11,999.08
1,059.914 0X5947BB275C521040051D82396192181B413227A3
0.0077%
89
Coinone
LINK-KRW$11.40
0.0043134 Eth
$11,047.23
968.938 LINK
0.0070%
90
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$11.47
0.0043385 Eth
$10,818.20
945.326 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0069%
91
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X1BFD67037B42CF73ACF2047067BD4F2C47D9BFD6$11.44
0.0043294 Eth
$9,741.57
851.055 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0062%
92
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X55D398326F99059FF775485246999027B3197955$11.46
0.0043338 Eth
$6,887.47
597.913 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0043%
93
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$11.41
0.0043149 Eth
$4,322.61
4,316.172 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.0313%
94
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$11.44
0.0043286 Eth
$3,086.44
270.200 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0020%
95
PancakeSwap V3 (Arbitrum)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$11.44
0.0043296 Eth
$2,277.01
199.679 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0014%
96
PancakeSwap (v2)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X55D398326F99059FF775485246999027B3197955$11.47
0.0043349 Eth
$1,548.00
93.533 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0007%
97
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$11.46
0.0043346 Eth
$860.37
75.466 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0005%
98
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X61299774020DA444AF134C82FA83E3810B309991$11.49
0.0043466 Eth
$860.20
74.089 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0005%
99
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$11.43
0.0043253 Eth
$258.52
22.350 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0002%
100
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X8F3CF7AD23CD3CADBD9735AFF958023239C6A063$11.45
0.0043312 Eth
$100.57
8.809 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
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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