ETH Price: $3,469.63 (+0.17%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

727,203 ( 0.015%)

Market

Price

$24.48 @ 0.007056 ETH (-1.25%)

Onchain Market Cap

$24,480,000,000.00

Circulating Supply Market Cap

$15,439,898,446.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
480.394711520000028672 LINK

Value
$11,760.06 ( ~3.3894 Eth) [0.0000%]
0xE0800a7A36495972F88A13ED78d4833CcED6822b
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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 22154.55% |ETH 0.0003846 1734.63%

Market

Volume (24H):$1,368,801,889.00
Market Capitalization:$15,439,898,446.00
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$24.44
0.0070507 Eth
$162,127,298.00
6,485,395.690 LINK
25.5040%
2
Coinbase Exchange
LINK-USD$24.47
0.0070570 Eth
$43,069,692.00
1,759,814.180 LINK
6.9205%
3
Bybit
LINK-USDT$24.46
0.0070523 Eth
$38,080,773.00
1,521,916.332 LINK
5.9850%
4
P2B
LINK-USDT$24.47
0.0070540 Eth
$33,073,906.00
1,351,694.830 LINK
5.3156%
5
CoinW
LINK-USDT$24.45
0.0070501 Eth
$29,212,870.00
1,194,684.110 LINK
4.6981%
6
Slex
LINK-USDT$24.48
0.0070566 Eth
$25,548,945.00
1,025,972.730 LINK
4.0347%
7
OKX
LINK-USDT$24.45
0.0070488 Eth
$25,538,511.00
1,021,010.437 LINK
4.0151%
8
DigiFinex
LINK-USDT$24.46
0.0070519 Eth
$20,387,725.00
833,543.030 LINK
3.2779%
9
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$24.56
0.0070800 Eth
$18,271,150.00
730,081.605 0X514910771AF9CA656AF840DFF83E8264ECF986CA
2.8711%
10
XT.COM
LINK-USDT$24.47
0.0070542 Eth
$17,737,293.00
709,030.330 LINK
2.7883%
11
FameEX
LINK-USDT$24.47
0.0070545 Eth
$16,119,220.00
644,810.355 LINK
2.5357%
12
Azbit
LINK-USDT$24.52
0.0070562 Eth
$16,034,348.00
641,518.240 LINK
2.5228%
13
Coinstore
LINK-USDT$24.49
0.0070600 Eth
$13,839,961.00
554,178.800 LINK
2.1793%
14
Bitunix
LINK-USDT$24.46
0.0070528 Eth
$12,574,239.00
514,141.320 LINK
2.0219%
15
HTX
LINK-USDT$24.46
0.0070512 Eth
$12,011,840.00
482,341.937 LINK
1.8968%
16
Binance
LINK-FDUSD$24.41
0.0070391 Eth
$9,666,385.00
387,337.970 LINK
1.5232%
17
BYDFi
LINK-USDT$24.46
0.0070519 Eth
$9,364,920.00
382,927.430 LINK
1.5059%
18
Biconomy.com
LINK-USDT$24.46
0.0070517 Eth
$8,404,616.00
336,774.730 LINK
1.3244%
19
LATOKEN
LINK-USDT$24.47
0.0070547 Eth
$7,708,040.00
315,049.634 LINK
1.2389%
20
Kraken
LINK-USD$24.47
0.0070554 Eth
$7,325,133.00
299,291.520 LINK
1.1770%
21
KuCoin
LINK-USDT$24.46
0.0070517 Eth
$6,458,015.00
264,018.860 LINK
1.0383%
22
QMall
LINK-USDT$24.47
0.0070538 Eth
$6,113,574.00
244,605.868 LINK
0.9619%
23
Coinbase Exchange
LINK-GBP$24.57
0.0070831 Eth
$5,400,880.00
219,844.100 LINK
0.8645%
24
Dex-Trade
LINK-USDT$24.57
0.0070698 Eth
$5,370,382.00
218,573.580 LINK
0.8595%
25
LBank
LINK-USDT$24.51
0.0070563 Eth
$5,081,681.00
207,340.940 LINK
0.8154%
26
Hotcoin
LINK-USDT$24.47
0.0070538 Eth
$3,799,412.00
155,297.290 LINK
0.6107%
27
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$24.52
0.0070696 Eth
$3,528,643.00
140,788.735 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.5537%
28
Bitvavo
LINK-EUR$24.52
0.0070686 Eth
$3,176,194.00
129,551.924 LINK
0.5095%
29
Bitstamp
LINK-USD$24.47
0.0070540 Eth
$2,982,293.00
121,875.483 LINK
0.4793%
30
Dcoin
LINK-USDT$24.47
0.0070447 Eth
$2,839,325.00
116,040.000 LINK
0.4563%
31
CoinEx
LINK-USDT$24.51
0.0070562 Eth
$2,715,049.00
108,565.814 LINK
0.4269%
32
PointPay
LINK-USDT$24.46
0.0070513 Eth
$2,490,058.00
99,659.202 LINK
0.3919%
33
EXMO
LINK-USDT$24.45
0.0070504 Eth
$2,464,291.00
100,772.562 LINK
0.3963%
34
WhiteBIT
LINK-BTC$24.48
0.0070598 Eth
$1,931,483.00
78,886.560 LINK
0.3102%
35
Coinbase Exchange
LINK-EUR$24.55
0.0070763 Eth
$1,877,645.00
76,491.910 LINK
0.3008%
36
WhiteBIT
LINK-TRY$24.61
0.0070949 Eth
$1,830,652.00
74,391.420 LINK
0.2925%
37
Phemex
LINK-USDT$24.47
0.0070550 Eth
$1,621,856.00
66,287.540 LINK
0.2607%
38
Bitstamp
LINK-EUR$24.54
0.0070732 Eth
$1,617,559.00
65,924.462 LINK
0.2592%
39
tanX
LINK-USDC$24.48
0.0070593 Eth
$1,289,431.00
51,690.400 LINK
0.2033%
40
BitStorage
LINK-USDT$24.50
0.0070634 Eth
$1,285,473.00
52,476.680 LINK
0.2064%
41
EarnBIT
LINK-USDT$24.37
0.0070294 Eth
$1,209,550.00
48,380.468 LINK
0.1903%
42
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$24.42
0.0070418 Eth
$1,170,850.00
46,838.475 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1842%
43
Binance
LINK-TRY$24.58
0.0070928 Eth
$1,030,363.00
40,965.590 LINK
0.1611%
44
Bitbank
LINK-JPY$24.51
0.0070676 Eth
$1,015,909.00
41,448.074 LINK
0.1630%
45
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$24.43
0.0070428 Eth
$990,675.00
39,457.008 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.1552%
46
Bybit
LINK-USDC$24.48
0.0070583 Eth
$874,778.00
34,873.102 LINK
0.1371%
47
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$24.47
0.0070555 Eth
$871,200.00
35,159.876 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1383%
48
Coinbase Exchange
LINK-USDT$24.49
0.0070601 Eth
$804,505.00
32,855.029 LINK
0.1292%
49
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$24.40
0.0070350 Eth
$793,903.00
31,810.305 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1251%
50
WhiteBIT
LINK-EUR$24.50
0.0070642 Eth
$717,165.00
29,270.660 LINK
0.1151%
51
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$24.52
0.0070696 Eth
$668,273.00
26,678.570 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.1049%
52
Coinbase Exchange
LINK-ETH$24.46
0.0070532 Eth
$619,767.00
25,337.450 LINK
0.0996%
53
BigONE
LINK-USDT$24.42
0.0070402 Eth
$606,401.00
24,834.420 LINK
0.0977%
54
Binance
LINK-EUR$24.54
0.0070744 Eth
$597,939.00
23,778.650 LINK
0.0935%
55
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$24.68
0.0071163 Eth
$593,437.00
23,631.632 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0929%
56
HashKey Exchange
LINK-USD$24.56
0.0070722 Eth
$552,176.00
22,119.138 LINK
0.0870%
57
KuCoin
LINK-USDC$24.42
0.0070391 Eth
$530,121.00
21,711.327 LINK
0.0854%
58
Gemini
LINK-USD$24.44
0.0070457 Eth
$473,072.00
19,355.524 LINK
0.0761%
59
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$24.41
0.0070384 Eth
$446,432.00
457,406.338 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
1.7988%
60
GMO Japan
LINK-JPY$24.38
0.0070295 Eth
$444,554.00
18,235.500 LINK
0.0717%
61
Slex
LINK-ETH$24.48
0.0070587 Eth
$441,476.00
17,801.010 LINK
0.0700%
62
BitMart
LINK-BTC$24.47
0.0070539 Eth
$390,209.00
15,948.920 LINK
0.0627%
63
DeGate
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$24.43
0.0070471 Eth
$373,135.00
14,970.391 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0589%
64
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$24.52
0.0070696 Eth
$355,610.00
363,353.167 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
1.4289%
65
Coinbase Exchange
LINK-BTC$24.46
0.0070530 Eth
$312,444.00
12,772.240 LINK
0.0502%
66
BitDelta
LINK-USDT$24.47
0.0070550 Eth
$309,608.00
12,413.000 LINK
0.0488%
67
LATOKEN
LINK-BTC$24.47
0.0070554 Eth
$289,194.00
11,818.137 LINK
0.0465%
68
Binance US
LINK-USDT$24.48
0.0070587 Eth
$255,835.00
10,449.958 LINK
0.0411%
69
Bitkub
LINK-THB$24.59
0.0070821 Eth
$252,782.00
10,279.015 LINK
0.0404%
70
Bitci TR
LINK-TRY$24.70
0.0071232 Eth
$248,338.00
9,936.470 LINK
0.0391%
71
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$24.48
0.0070574 Eth
$239,529.00
9,589.731 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0377%
72
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$24.41
0.0070384 Eth
$227,374.00
9,193.158 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0362%
73
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$24.52
0.0070709 Eth
$212,964.00
8,516.186 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0335%
74
BitMart
LINK-ETH$24.45
0.0070491 Eth
$211,235.00
8,639.680 LINK
0.0340%
75
BitStorage
LINK-ETH$24.46
0.0070516 Eth
$202,013.00
8,258.840 LINK
0.0325%
76
BTCMarkets
LINK-AUD$24.61
0.0070844 Eth
$195,242.00
7,934.747 LINK
0.0312%
77
PointPay
LINK-BTC$24.45
0.0070496 Eth
$194,578.00
7,723.474 LINK
0.0304%
78
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$24.50
0.0070628 Eth
$178,856.00
7,135.375 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0281%
79
KuCoin
LINK-BTC$24.42
0.0070412 Eth
$177,045.00
7,248.826 LINK
0.0285%
80
Kraken
LINK-GBP$24.61
0.0070939 Eth
$168,300.00
6,839.140 LINK
0.0269%
81
Bitso
LINK-USD$24.56
0.0070692 Eth
$135,991.00
5,537.579 LINK
0.0218%
82
Hotcoin
LINK-BTC$24.46
0.0070525 Eth
$133,000.00
5,437.320 LINK
0.0214%
83
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$24.41
0.0070384 Eth
$113,379.00
4,530.712 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0178%
84
PancakeSwap (v2)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$24.46
0.0070516 Eth
$91,304.00
3,634.005 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0143%
85
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$24.53
0.0070731 Eth
$84,680.00
3,345.681 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0132%
86
Bitexen
LINK-TRY$24.33
0.0070046 Eth
$62,379.00
2,563.937 LINK
0.0101%
87
THENA FUSION
0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$24.56
0.0070808 Eth
$62,368.00
83.481 0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827
0.0003%
88
Independent Reserve
LINK-AUD$24.63
0.0070914 Eth
$45,198.00
1,835.131 LINK
0.0072%
89
Hotcoin
LINK-ETH$24.47
0.0070556 Eth
$45,146.00
1,845.040 LINK
0.0073%
90
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XDAC17F958D2EE523A2206206994597C13D831EC7$24.56
0.0070800 Eth
$41,505.00
1,674.210 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0066%
91
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XD6DF932A45C0F255F85145F286EA0B292B21C90B$24.90
0.0071795 Eth
$40,646.00
1,635.262 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0064%
92
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$24.50
0.0070645 Eth
$29,248.00
1,166.473 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0046%
93
Uniswap V3 (Avalanche)
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$24.56
0.0070808 Eth
$25,692.00
1,042.141 0X5947BB275C521040051D82396192181B413227A3
0.0041%
94
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X1BFD67037B42CF73ACF2047067BD4F2C47D9BFD6$24.45
0.0070488 Eth
$24,427.00
970.548 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0038%
95
Binance US
LINK-BTC$24.57
0.0070753 Eth
$24,238.00
986.355 LINK
0.0039%
96
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$24.61
0.0070963 Eth
$23,467.00
934.168 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0037%
97
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$24.41
0.0070384 Eth
$17,153.12
686.054 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0027%
98
Biswap V3
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$24.57
0.0070821 Eth
$16,901.01
672.024 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0026%
99
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XD93F7E271CB87C23AAA73EDC008A79646D1F9912$24.53
0.0070724 Eth
$14,881.51
590.645 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0023%
100
Ace
LINK-USDT$24.46
0.0070516 Eth
$6,174.90
247.130 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:
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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