ETH Price: $3,409.94 (+1.65%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

728,031 ( 0.017%)

Market

Price

$23.33 @ 0.006842 ETH (+1.33%)

Onchain Market Cap

$23,330,000,000.00

Circulating Supply Market Cap

$14,716,941,442.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
1,097 LINK

Value
$25,593.01 ( ~7.5054 Eth) [0.0001%]
0x30e42c1c7dce4737bcc3c21641b8e1b4eea7738c
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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 21109.09% |ETH 0.0003846 1678.99%

Market

Volume (24H):$958,244,826.00
Market Capitalization:$14,716,941,442.00
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$23.38
0.0068560 Eth
$95,698,453.00
4,171,698.990 LINK
20.7921%
2
Coinbase Exchange
LINK-USD$23.36
0.0068482 Eth
$37,303,993.00
1,597,054.240 LINK
7.9599%
3
Bitget
LINK-USDT$23.30
0.0068289 Eth
$27,664,693.00
1,206,650.224 LINK
6.0141%
4
MEXC
LINK-USDT$23.30
0.0068337 Eth
$27,103,882.00
1,163,111.610 LINK
5.7971%
5
Slex
LINK-USDT$23.32
0.0068377 Eth
$22,878,318.00
999,417.110 LINK
4.9812%
6
Bybit
LINK-USDT$23.33
0.0068381 Eth
$22,527,015.00
983,080.639 LINK
4.8998%
7
P2B
LINK-USDT$23.32
0.0068401 Eth
$19,609,261.00
840,704.080 LINK
4.1901%
8
OKX
LINK-USDT$23.30
0.0068344 Eth
$18,234,290.00
795,004.685 LINK
3.9624%
9
CoinW
LINK-USDT$23.34
0.0068435 Eth
$16,291,191.00
698,109.070 LINK
3.4794%
10
DigiFinex
LINK-USDT$23.30
0.0068301 Eth
$12,913,160.00
554,217.020 LINK
2.7623%
11
HTX
LINK-USDT$23.34
0.0068438 Eth
$11,244,132.00
491,508.491 LINK
2.4497%
12
XT.COM
LINK-USDT$23.35
0.0068401 Eth
$9,564,328.00
416,902.060 LINK
2.0779%
13
Azbit
LINK-USDT$23.31
0.0068374 Eth
$9,536,611.00
415,673.683 LINK
2.0718%
14
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$23.39
0.0068605 Eth
$9,475,552.00
405,445.168 0X514910771AF9CA656AF840DFF83E8264ECF986CA
2.0208%
15
Coinstore
LINK-USDT$23.25
0.0068154 Eth
$8,240,255.00
359,461.820 LINK
1.7916%
16
Bitunix
LINK-USDT$23.32
0.0068362 Eth
$8,006,249.00
343,418.570 LINK
1.7116%
17
BTSE
LINK-USDT$23.35
0.0068425 Eth
$6,929,286.00
296,762.136 LINK
1.4791%
18
Biconomy.com
LINK-USDT$23.31
0.0068318 Eth
$6,506,001.00
283,880.454 LINK
1.4149%
19
Binance
LINK-FDUSD$23.35
0.0068436 Eth
$6,248,052.00
272,710.890 LINK
1.3592%
20
BYDFi
LINK-USDT$23.31
0.0068386 Eth
$6,176,089.00
264,905.660 LINK
1.3203%
21
Kraken
LINK-USD$23.35
0.0068478 Eth
$5,318,417.00
227,763.813 LINK
1.1352%
22
Hotcoin
LINK-USDT$23.32
0.0068396 Eth
$5,274,694.00
226,159.590 LINK
1.1272%
23
KuCoin
LINK-USDT$23.30
0.0068295 Eth
$4,734,226.00
203,205.470 LINK
1.0128%
24
LATOKEN
LINK-USDT$23.29
0.0068282 Eth
$4,616,506.00
198,192.542 LINK
0.9878%
25
LBank
LINK-USDT$23.28
0.0068255 Eth
$4,486,964.00
192,699.530 LINK
0.9604%
26
Dex-Trade
LINK-USDT$23.32
0.0068424 Eth
$3,077,677.00
131,949.119 LINK
0.6576%
27
FMCPAY
LINK-USDT$23.31
0.0068366 Eth
$2,916,923.00
127,340.777 LINK
0.6347%
28
Binance
LINK-USDC$23.39
0.0068521 Eth
$2,860,661.00
124,541.630 LINK
0.6207%
29
Coinbase Exchange
LINK-GBP$23.37
0.0068534 Eth
$2,542,864.00
108,808.900 LINK
0.5423%
30
Dcoin
LINK-USDT$23.37
0.0068494 Eth
$2,478,667.00
106,083.000 LINK
0.5287%
31
Bitvavo
LINK-EUR$23.34
0.0068433 Eth
$1,969,836.00
84,402.648 LINK
0.4207%
32
PointPay
LINK-USDT$23.31
0.0068346 Eth
$1,600,291.00
69,762.866 LINK
0.3477%
33
FMCPAY
LINK-ETH$23.31
0.0068350 Eth
$1,497,655.00
64,376.480 LINK
0.3209%
34
EXMO
LINK-USDT$23.38
0.0068541 Eth
$1,463,436.00
62,598.700 LINK
0.3120%
35
FMCPAY
LINK-BTC$23.32
0.0068391 Eth
$1,430,606.00
62,075.400 LINK
0.3094%
36
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$23.30
0.0068305 Eth
$1,422,946.00
61,009.562 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.3041%
37
WhiteBIT
LINK-TRY$23.31
0.0068354 Eth
$1,383,136.00
59,339.320 LINK
0.2958%
38
WhiteBIT
LINK-BTC$23.31
0.0068367 Eth
$1,382,441.00
59,299.730 LINK
0.2956%
39
Bybit
LINK-USDC$23.36
0.0068486 Eth
$1,342,261.00
58,722.078 LINK
0.2927%
40
CoinEx
LINK-USDT$23.33
0.0068417 Eth
$1,248,975.00
54,567.176 LINK
0.2720%
41
Bitbank
LINK-JPY$23.42
0.0068670 Eth
$1,126,383.00
48,087.939 LINK
0.2397%
42
Phemex
LINK-USDT$23.26
0.0068195 Eth
$1,051,552.00
45,199.730 LINK
0.2253%
43
Coinbase Exchange
LINK-USDT$23.39
0.0068602 Eth
$1,031,099.00
44,077.439 LINK
0.2197%
44
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$23.40
0.0068593 Eth
$957,807.00
68,719.217 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.3425%
45
Coinbase Exchange
LINK-EUR$23.33
0.0068417 Eth
$895,840.00
38,398.300 LINK
0.1914%
46
EarnBIT
LINK-USDT$23.24
0.0068132 Eth
$860,305.00
37,587.386 LINK
0.1873%
47
BigONE
LINK-USDT$23.32
0.0068369 Eth
$845,043.00
36,232.480 LINK
0.1806%
48
itBit
LINK-USD$23.41
0.0068634 Eth
$755,024.00
32,252.195 LINK
0.1607%
49
Binance
LINK-TRY$23.30
0.0068331 Eth
$630,961.00
27,367.220 LINK
0.1364%
50
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$23.30
0.0068309 Eth
$554,566.00
23,850.081 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1189%
51
Gemini
LINK-USD$23.38
0.0068567 Eth
$536,270.00
22,936.145 LINK
0.1143%
52
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$23.31
0.0068340 Eth
$534,135.00
22,636.513 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1128%
53
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$23.38
0.0068542 Eth
$533,716.00
22,874.968 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.1140%
54
Koinpark
LINK-USDT$23.31
0.0068374 Eth
$500,368.00
21,461.737 LINK
0.1070%
55
WhiteBIT
LINK-EUR$23.37
0.0068507 Eth
$459,020.00
19,637.750 LINK
0.0979%
56
GMO Japan
LINK-JPY$23.34
0.0068448 Eth
$414,417.00
17,755.400 LINK
0.0885%
57
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$23.36
0.0068481 Eth
$408,093.00
17,763.444 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0885%
58
Slex
LINK-ETH$23.35
0.0068433 Eth
$404,694.00
17,380.330 LINK
0.0866%
59
HashKey Exchange
LINK-USD$23.35
0.0068488 Eth
$377,161.00
16,440.491 LINK
0.0819%
60
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$23.30
0.0068330 Eth
$362,042.00
356,178.496 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
1.7752%
61
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$23.30
0.0068317 Eth
$359,043.00
15,452.944 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0770%
62
BitMart
LINK-BTC$23.30
0.0068338 Eth
$334,878.00
14,370.820 LINK
0.0716%
63
OKX
LINK-USDC$23.36
0.0068520 Eth
$293,880.00
12,851.926 LINK
0.0641%
64
BitDelta
LINK-USDT$23.30
0.0068339 Eth
$272,615.00
11,908.000 LINK
0.0594%
65
Bitci TR
LINK-TRY$23.17
0.0067880 Eth
$233,226.00
10,146.140 LINK
0.0506%
66
Bitkub
LINK-THB$23.34
0.0068447 Eth
$213,184.00
9,133.547 LINK
0.0455%
67
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$23.47
0.0068842 Eth
$210,484.00
9,037.293 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0450%
68
Coinbase Exchange
LINK-BTC$23.30
0.0068335 Eth
$208,503.00
8,947.990 LINK
0.0446%
69
DeGate
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$23.30
0.0068327 Eth
$193,310.00
8,437.892 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0421%
70
Hotcoin
LINK-BTC$23.38
0.0068463 Eth
$184,729.00
7,902.800 LINK
0.0394%
71
LATOKEN
LINK-BTC$23.31
0.0068325 Eth
$180,223.00
7,732.232 LINK
0.0385%
72
Binance
LINK-BRL$23.55
0.0068957 Eth
$143,110.00
6,236.240 LINK
0.0311%
73
PointPay
LINK-BTC$23.32
0.0068381 Eth
$138,374.00
5,998.493 LINK
0.0299%
74
BitMart
LINK-ETH$23.32
0.0068361 Eth
$133,563.00
5,728.180 LINK
0.0285%
75
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$23.25
0.0068167 Eth
$121,070.00
5,281.226 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0263%
76
Bitso
LINK-USD$23.35
0.0068443 Eth
$109,396.00
4,685.846 LINK
0.0234%
77
BitStorage
LINK-ETH$23.39
0.0068511 Eth
$103,384.00
4,419.720 LINK
0.0220%
78
Binance US
LINK-USDT$23.34
0.0068430 Eth
$97,378.00
4,171.849 LINK
0.0208%
79
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$23.28
0.0068258 Eth
$95,389.00
4,102.028 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0204%
80
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$23.31
0.0068340 Eth
$90,406.00
3,950.434 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0197%
81
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$23.28
0.0068260 Eth
$87,682.00
86,692.958 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.4321%
82
Coinbase Exchange
LINK-ETH$23.38
0.0068544 Eth
$78,505.00
3,357.880 LINK
0.0167%
83
Hotcoin
LINK-ETH$23.30
0.0068286 Eth
$64,575.00
2,771.870 LINK
0.0138%
84
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$23.25
0.0068177 Eth
$59,258.00
2,546.838 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0127%
85
Nonkyc.io
LINK-BTC$23.41
0.0068647 Eth
$54,033.00
2,343.951 LINK
0.0117%
86
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$23.31
0.0068358 Eth
$52,275.00
2,230.477 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0111%
87
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$23.37
0.0068528 Eth
$39,875.00
1,721.544 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0086%
88
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XDAC17F958D2EE523A2206206994597C13D831EC7$23.42
0.0068651 Eth
$27,475.00
1,191.277 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0059%
89
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$23.32
0.0068402 Eth
$17,896.90
784.651 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0039%
90
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X1BFD67037B42CF73ACF2047067BD4F2C47D9BFD6$23.36
0.0068505 Eth
$17,731.32
766.852 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0038%
91
Bitexen
LINK-TRY$23.14
0.0067816 Eth
$17,424.24
753.126 LINK
0.0038%
92
Uniswap V3 (Avalanche)
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$23.29
0.0068310 Eth
$15,861.51
675.166 0X5947BB275C521040051D82396192181B413227A3
0.0034%
93
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$23.43
0.0068723 Eth
$15,284.96
15,030.064 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.0749%
94
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$23.23
0.0068108 Eth
$14,828.75
647.504 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0032%
95
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$23.42
0.0068663 Eth
$14,359.05
615.375 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0031%
96
THENA FUSION
0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$23.29
0.0068303 Eth
$13,566.88
17.686 0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827
0.0001%
97
LFJ
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$23.39
0.0068588 Eth
$13,478.34
579.597 0X5947BB275C521040051D82396192181B413227A3
0.0029%
98
KuCoin
LINK-KCS$23.43
0.0068678 Eth
$10,940.01
466.955 LINK
0.0023%
99
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X55D398326F99059FF775485246999027B3197955$23.30
0.0068319 Eth
$8,134.63
354.799 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0018%
100
Pangolin
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$23.33
0.0068405 Eth
$7,538.40
322.693 0X5947BB275C521040051D82396192181B413227A3
0.0016%

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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