ETH Price: $3,412.67 (+1.73%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

728,005 ( 0.017%)

Market

Price

$23.32 @ 0.006833 ETH (+1.18%)

Onchain Market Cap

$23,320,000,000.00

Circulating Supply Market Cap

$14,715,718,522.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
0 LINK

Value
$0.00
0x10be6674fe3d089860c5479187005026c66ada8e
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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 21100% |ETH 0.0003846 1676.65%

Market

Volume (24H):$957,130,881.00
Market Capitalization:$14,715,718,522.00
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
Coinbase Exchange
LINK-USD$23.28
0.0068213 Eth
$36,919,925.00
1,585,907.440 LINK
11.2964%
2
Bitget
LINK-USDT$23.31
0.0068386 Eth
$27,577,725.00
1,203,086.961 LINK
8.5696%
3
Bybit
LINK-USDT$23.28
0.0068296 Eth
$22,449,404.00
979,758.368 LINK
6.9788%
4
P2B
LINK-USDT$23.34
0.0068401 Eth
$19,480,831.00
834,518.190 LINK
5.9443%
5
OKX
LINK-USDT$23.29
0.0068271 Eth
$17,786,453.00
775,722.145 LINK
5.5255%
6
Gate.io
LINK-USDT$23.26
0.0068180 Eth
$17,406,656.00
758,569.460 LINK
5.4033%
7
CoinW
LINK-USDT$23.29
0.0068308 Eth
$16,191,600.00
695,281.740 LINK
4.9525%
8
DigiFinex
LINK-USDT$23.27
0.0068265 Eth
$12,798,149.00
549,907.610 LINK
3.9170%
9
HTX
LINK-USDT$23.29
0.0068305 Eth
$11,265,399.00
492,451.726 LINK
3.5077%
10
XT.COM
LINK-USDT$23.34
0.0068384 Eth
$9,546,331.00
416,082.100 LINK
2.9637%
11
Azbit
LINK-USDT$23.27
0.0068217 Eth
$9,497,692.00
414,075.463 LINK
2.9495%
12
Coinstore
LINK-USDT$23.34
0.0068436 Eth
$8,195,136.00
357,575.640 LINK
2.5470%
13
Bitunix
LINK-USDT$23.29
0.0068313 Eth
$7,966,989.00
341,721.170 LINK
2.4341%
14
BTSE
LINK-USDT$23.28
0.0068232 Eth
$6,881,810.00
295,643.603 LINK
2.1059%
15
Biconomy.com
LINK-USDT$23.34
0.0068454 Eth
$6,469,870.00
282,407.074 LINK
2.0116%
16
Binance
LINK-FDUSD$23.41
0.0068605 Eth
$6,198,528.00
270,474.870 LINK
1.9266%
17
BYDFi
LINK-USDT$23.31
0.0068386 Eth
$6,176,089.00
264,905.660 LINK
1.8869%
18
Kraken
LINK-USD$23.28
0.0068225 Eth
$5,302,966.00
227,839.462 LINK
1.6229%
19
Hotcoin
LINK-USDT$23.28
0.0068295 Eth
$5,270,668.00
226,361.200 LINK
1.6124%
20
KuCoin
LINK-USDT$23.26
0.0068190 Eth
$4,716,600.00
202,767.425 LINK
1.4443%
21
LATOKEN
LINK-USDT$23.27
0.0068226 Eth
$4,600,234.00
197,648.825 LINK
1.4078%
22
LBank
LINK-USDT$23.28
0.0068255 Eth
$4,486,964.00
192,699.530 LINK
1.3726%
23
Dex-Trade
LINK-USDT$23.31
0.0068332 Eth
$3,064,689.00
131,462.169 LINK
0.9364%
24
Binance
LINK-USDC$23.37
0.0068503 Eth
$2,968,941.00
129,337.830 LINK
0.9213%
25
FMCPAY
LINK-USDT$23.26
0.0068239 Eth
$2,923,877.00
127,648.191 LINK
0.9092%
26
Coinbase Exchange
LINK-GBP$23.31
0.0068337 Eth
$2,523,039.00
108,231.570 LINK
0.7709%
27
Dcoin
LINK-USDT$23.46
0.0068696 Eth
$2,489,052.00
106,111.000 LINK
0.7558%
28
Bitvavo
LINK-EUR$23.32
0.0068322 Eth
$2,067,721.00
88,678.789 LINK
0.6317%
29
PointPay
LINK-USDT$23.30
0.0068266 Eth
$1,584,566.00
69,076.293 LINK
0.4920%
30
FMCPAY
LINK-ETH$23.38
0.0068510 Eth
$1,499,402.00
64,399.680 LINK
0.4587%
31
EXMO
LINK-USDT$23.28
0.0068230 Eth
$1,451,292.00
62,350.007 LINK
0.4441%
32
FMCPAY
LINK-BTC$23.37
0.0068541 Eth
$1,432,030.00
62,069.900 LINK
0.4421%
33
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$23.30
0.0068290 Eth
$1,422,894.00
61,012.299 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.4346%
34
WhiteBIT
LINK-BTC$23.30
0.0068336 Eth
$1,380,456.00
59,254.010 LINK
0.4221%
35
WhiteBIT
LINK-TRY$23.24
0.0068113 Eth
$1,377,206.00
59,268.220 LINK
0.4222%
36
Bybit
LINK-USDC$23.25
0.0068202 Eth
$1,338,740.00
58,559.965 LINK
0.4171%
37
CoinEx
LINK-USDT$23.38
0.0068584 Eth
$1,227,773.00
53,671.520 LINK
0.3823%
38
Bitbank
LINK-JPY$23.34
0.0068411 Eth
$1,188,702.00
50,936.957 LINK
0.3628%
39
Phemex
LINK-USDT$23.26
0.0068195 Eth
$1,051,552.00
45,199.730 LINK
0.3220%
40
Coinbase Exchange
LINK-USDT$23.30
0.0068266 Eth
$1,012,182.00
43,448.704 LINK
0.3095%
41
tanX
LINK-USDC$23.31
0.0068327 Eth
$949,700.00
41,397.720 LINK
0.2949%
42
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$23.28
0.0068236 Eth
$945,822.00
68,216.646 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.4859%
43
Azbit
LINK-ETH$23.36
0.0068420 Eth
$920,547.00
39,554.831 LINK
0.2817%
44
Coinbase Exchange
LINK-EUR$23.30
0.0068306 Eth
$893,018.00
38,325.510 LINK
0.2730%
45
EarnBIT
LINK-USDT$23.24
0.0068132 Eth
$860,305.00
37,587.386 LINK
0.2677%
46
BigONE
LINK-USDT$23.32
0.0068369 Eth
$845,043.00
36,232.480 LINK
0.2581%
47
BitStorage
LINK-USDT$23.36
0.0068432 Eth
$787,426.00
33,709.610 LINK
0.2401%
48
itBit
LINK-USD$23.42
0.0068630 Eth
$765,707.00
32,694.578 LINK
0.2329%
49
Binance
LINK-TRY$23.35
0.0068493 Eth
$617,775.00
26,812.660 LINK
0.1910%
50
Gemini
LINK-USD$23.40
0.0068648 Eth
$536,464.00
22,921.360 LINK
0.1633%
51
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$23.27
0.0068217 Eth
$530,479.00
22,732.390 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.1619%
52
Koinpark
LINK-USDT$23.34
0.0068469 Eth
$500,033.00
21,422.992 LINK
0.1526%
53
WhiteBIT
LINK-EUR$23.33
0.0068352 Eth
$459,006.00
19,678.440 LINK
0.1402%
54
GMO Japan
LINK-JPY$23.35
0.0068439 Eth
$426,623.00
18,273.800 LINK
0.1302%
55
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$23.36
0.0068471 Eth
$409,295.00
17,827.684 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.1270%
56
Slex
LINK-ETH$23.36
0.0068408 Eth
$405,220.00
17,395.020 LINK
0.1239%
57
HashKey Exchange
LINK-USD$23.40
0.0068536 Eth
$377,529.00
16,456.598 LINK
0.1172%
58
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$23.28
0.0068254 Eth
$338,200.00
332,493.198 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
2.3683%
59
BitMart
LINK-BTC$23.28
0.0068280 Eth
$335,741.00
14,423.040 LINK
0.1027%
60
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$23.32
0.0068343 Eth
$334,292.00
14,354.980 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1023%
61
OKX
LINK-USDC$23.30
0.0068305 Eth
$291,043.00
12,719.350 LINK
0.0906%
62
Bitci TR
LINK-TRY$23.20
0.0067966 Eth
$233,105.00
10,144.690 LINK
0.0723%
63
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$23.48
0.0068878 Eth
$210,550.00
9,037.293 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0644%
64
Bitkub
LINK-THB$23.51
0.0068933 Eth
$208,695.00
8,875.053 LINK
0.0632%
65
Coinbase Exchange
LINK-BTC$23.29
0.0068257 Eth
$206,365.00
8,861.790 LINK
0.0631%
66
DeGate
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$23.28
0.0068213 Eth
$193,314.00
8,432.075 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0601%
67
Hotcoin
LINK-BTC$23.30
0.0068258 Eth
$184,026.00
7,899.670 LINK
0.0563%
68
LATOKEN
LINK-BTC$23.29
0.0068278 Eth
$180,139.00
7,733.704 LINK
0.0551%
69
PointPay
LINK-BTC$23.30
0.0068290 Eth
$137,414.00
5,949.979 LINK
0.0424%
70
BitMart
LINK-ETH$23.31
0.0068322 Eth
$134,330.00
5,763.660 LINK
0.0411%
71
Bitso
LINK-USD$23.37
0.0068496 Eth
$109,521.00
4,687.269 LINK
0.0334%
72
Binance US
LINK-USDT$23.38
0.0068510 Eth
$102,610.00
4,387.914 LINK
0.0313%
73
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$23.32
0.0068364 Eth
$92,224.00
3,957.854 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0282%
74
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$23.36
0.0068514 Eth
$88,232.00
86,931.559 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.6192%
75
Coinbase Exchange
LINK-ETH$23.38
0.0068525 Eth
$78,501.00
3,357.880 LINK
0.0239%
76
Hotcoin
LINK-ETH$23.30
0.0068286 Eth
$64,575.00
2,771.870 LINK
0.0197%
77
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$23.31
0.0068315 Eth
$59,389.00
2,546.848 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0181%
78
Mercado Bitcoin
LINK-BRL$23.38
0.0068549 Eth
$41,024.00
1,754.385 LINK
0.0125%
79
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$23.34
0.0068430 Eth
$39,826.00
1,721.544 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0123%
80
Korbit
LINK-KRW$23.57
0.0069143 Eth
$30,489.00
1,303.780 LINK
0.0093%
81
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$23.36
0.0068465 Eth
$17,910.32
784.285 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0056%
82
Bitexen
LINK-TRY$23.14
0.0067816 Eth
$17,424.24
753.126 LINK
0.0054%
83
Uniswap V3 (Avalanche)
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$23.32
0.0068417 Eth
$15,882.98
675.166 0X5947BB275C521040051D82396192181B413227A3
0.0048%
84
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$23.34
0.0068410 Eth
$15,410.28
15,214.159 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.1084%
85
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$23.44
0.0068718 Eth
$14,734.42
642.626 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0046%
86
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$23.40
0.0068571 Eth
$14,451.84
619.209 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0044%
87
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X1BFD67037B42CF73ACF2047067BD4F2C47D9BFD6$23.44
0.0068700 Eth
$13,914.46
599.138 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0043%
88
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X55D398326F99059FF775485246999027B3197955$23.44
0.0068760 Eth
$8,185.38
354.799 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0025%
89
Uniswap V3 (Arbitrum One)
0X0C880F6761F1AF8D9AA9C466984B80DAB9A8C9E8-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$23.34
0.0068403 Eth
$4,626.67
898.408 0X0C880F6761F1AF8D9AA9C466984B80DAB9A8C9E8
0.0064%
90
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$23.35
0.0068460 Eth
$4,047.93
171.954 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0012%
91
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XD6DF932A45C0F255F85145F286EA0B292B21C90B$23.33
0.0068426 Eth
$3,587.02
156.275 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0011%
92
Ace
LINK-USDT$23.30
0.0068293 Eth
$3,499.26
152.540 LINK
0.0011%
93
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFA7F8980B0F1E64A2062791CC3B0871572F1F7F0$23.34
0.0068414 Eth
$3,196.90
135.424 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0010%
94
PancakeSwap V3 (Arbitrum)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$23.47
0.0068781 Eth
$3,079.73
131.537 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0009%
95
CoinEx
LINK-USDC$23.35
0.0068482 Eth
$3,027.41
131.950 LINK
0.0009%
96
CoinEx
LINK-BTC$23.43
0.0068688 Eth
$2,085.42
90.196 LINK
0.0006%
97
Uniswap V3 (Arbitrum One)
0XBA5DDD1F9D7F570DC94A51479A000E3BCE967196-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$23.30
0.0068293 Eth
$1,125.80
3.255 0XBA5DDD1F9D7F570DC94A51479A000E3BCE967196
0.0000%
98
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X8AC76A51CC950D9822D68B83FE1AD97B32CD580D$23.34
0.0068466 Eth
$912.12
39.790 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0003%
99
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC3C7D422809852031B44AB29EEC9F1EFF2A58756$23.43
0.0068712 Eth
$527.31
21.923 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0002%
100
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XB33EAAD8D922B1083446DC23F610C2567FB5180F$23.24
0.0068162 Eth
$474.77
20.141 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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