ETH Price: $3,242.13 (+0.04%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

725,737 ( 0.003%)

Market

Price

$20.00 @ 0.006169 ETH (+0.52%)

Onchain Market Cap

$20,000,000,000.00

Circulating Supply Market Cap

$12,619,220,846.00

Other Info

Token Contract (WITH 18 Decimals)

Filtered by Token Holder
bullbullbull.eth
Balance
0.000169449012543555 LINK

Value
$0.00 ( ~0 Eth) [0.0000%]
0xDB74749397d10764F55407a142FB8888f4e96768
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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 18081.82% |ETH 0.0003846 1504%

Market

Volume (24H):$824,195,629.00
Market Capitalization:$12,619,220,846.00
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$19.98
0.0061596 Eth
$38,634,245.00
1,933,742.670 LINK
12.9176%
2
Bybit
LINK-USDT$19.97
0.0061596 Eth
$20,957,294.00
1,044,164.073 LINK
6.9751%
3
P2B
LINK-USDT$20.03
0.0061674 Eth
$17,281,441.00
862,609.750 LINK
5.7623%
4
Slex
LINK-USDT$20.00
0.0061637 Eth
$17,047,890.00
846,290.610 LINK
5.6533%
5
MEXC
LINK-USDT$19.99
0.0061611 Eth
$16,271,108.00
814,047.870 LINK
5.4379%
6
DigiFinex
LINK-USDT$19.97
0.0061581 Eth
$12,071,166.00
604,526.530 LINK
4.0383%
7
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$19.96
0.0061550 Eth
$11,767,736.00
588,999.813 0X514910771AF9CA656AF840DFF83E8264ECF986CA
3.9346%
8
HTX
LINK-USDT$19.97
0.0061572 Eth
$11,466,967.00
568,965.772 LINK
3.8008%
9
OKX
LINK-USDT$19.97
0.0061568 Eth
$10,839,702.00
539,023.245 LINK
3.6007%
10
XT.COM
LINK-USDT$19.99
0.0061609 Eth
$9,932,953.00
494,324.560 LINK
3.3021%
11
Azbit
LINK-USDT$20.01
0.0061678 Eth
$9,762,172.00
485,991.099 LINK
3.2465%
12
Coinstore
LINK-USDT$20.00
0.0061671 Eth
$8,510,022.00
423,513.960 LINK
2.8291%
13
CoinW
LINK-USDT$19.97
0.0061553 Eth
$7,766,226.00
388,960.470 LINK
2.5983%
14
Hotcoin
LINK-USDT$20.01
0.0061683 Eth
$6,315,846.00
315,659.650 LINK
2.1086%
15
Binance
LINK-FDUSD$20.00
0.0061648 Eth
$6,038,912.00
300,504.240 LINK
2.0074%
16
BYDFi
LINK-USDT$19.94
0.0061497 Eth
$5,495,860.00
275,650.890 LINK
1.8414%
17
Binance
LINK-USDC$19.98
0.0061577 Eth
$5,307,073.00
263,911.270 LINK
1.7630%
18
LATOKEN
LINK-USDT$20.01
0.0061675 Eth
$4,866,843.00
243,270.675 LINK
1.6251%
19
LBank
LINK-USDT$20.02
0.0061622 Eth
$4,847,923.00
242,198.200 LINK
1.6179%
20
KuCoin
LINK-USDT$19.97
0.0061571 Eth
$4,536,356.00
227,147.460 LINK
1.5174%
21
Kraken
LINK-USD$19.99
0.0061616 Eth
$4,047,226.00
202,489.582 LINK
1.3527%
22
QMall
LINK-USDT$20.01
0.0061677 Eth
$3,980,377.00
198,166.428 LINK
1.3238%
23
Dex-Trade
LINK-USDT$20.00
0.0061640 Eth
$3,133,712.00
156,707.330 LINK
1.0468%
24
FMCPAY
LINK-USDT$20.04
0.0061681 Eth
$2,195,713.00
109,079.748 LINK
0.7287%
25
Biconomy.com
LINK-USDT$19.98
0.0061593 Eth
$1,829,510.00
90,819.570 LINK
0.6067%
26
CoinEx
LINK-USDT$20.04
0.0061731 Eth
$1,796,468.00
88,968.203 LINK
0.5943%
27
Coinbase Exchange
LINK-GBP$20.01
0.0061685 Eth
$1,747,297.00
87,329.570 LINK
0.5834%
28
PointPay
LINK-USDT$20.01
0.0061614 Eth
$1,598,740.00
79,564.770 LINK
0.5315%
29
Coinbase Exchange
LINK-EUR$20.05
0.0061818 Eth
$1,462,052.00
72,914.980 LINK
0.4871%
30
Bitvavo
LINK-EUR$20.06
0.0061797 Eth
$1,332,932.00
66,458.531 LINK
0.4440%
31
FMCPAY
LINK-ETH$20.02
0.0061691 Eth
$1,180,434.00
59,034.560 LINK
0.3944%
32
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$20.08
0.0061905 Eth
$1,129,976.00
56,656.546 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.3785%
33
EXMO
LINK-USDT$19.99
0.0061618 Eth
$1,118,930.00
55,984.948 LINK
0.3740%
34
FMCPAY
LINK-BTC$19.98
0.0061597 Eth
$1,079,220.00
53,603.400 LINK
0.3581%
35
Phemex
LINK-USDT$19.88
0.0061323 Eth
$1,054,722.00
53,042.380 LINK
0.3543%
36
Bybit
LINK-USDC$19.98
0.0061619 Eth
$998,409.00
49,661.347 LINK
0.3317%
37
Coinbase Exchange
LINK-USDT$20.01
0.0061702 Eth
$952,299.00
47,580.044 LINK
0.3178%
38
BigONE
LINK-USDT$20.00
0.0061583 Eth
$942,871.00
47,133.800 LINK
0.3149%
39
Trubit
LINK-USDT$19.97
0.0061571 Eth
$796,478.00
39,566.190 LINK
0.2643%
40
tanX
LINK-USDC$20.01
0.0061704 Eth
$777,941.00
38,559.630 LINK
0.2576%
41
Bitbank
LINK-JPY$20.13
0.0062052 Eth
$769,273.00
38,220.358 LINK
0.2553%
42
BitStorage
LINK-USDT$20.04
0.0061686 Eth
$765,000.00
38,179.220 LINK
0.2550%
43
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$20.06
0.0061842 Eth
$762,009.00
37,942.147 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.2535%
44
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$20.01
0.0061664 Eth
$755,210.00
37,556.847 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.2509%
45
Tokpie
LINK-USDT$20.04
0.0061788 Eth
$753,921.00
37,611.598 LINK
0.2512%
46
Coinbase Exchange
LINK-ETH$20.01
0.0061684 Eth
$742,670.00
37,117.240 LINK
0.2479%
47
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$19.96
0.0061550 Eth
$650,074.00
48,429.670 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.3235%
48
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$19.98
0.0061591 Eth
$613,737.00
616,970.770 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
4.1214%
49
OKX
LINK-USDC$20.02
0.0061705 Eth
$561,242.00
27,947.432 LINK
0.1867%
50
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$19.98
0.0061603 Eth
$496,512.00
24,901.634 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1663%
51
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$19.97
0.0061561 Eth
$485,317.00
24,324.985 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1625%
52
Gemini
LINK-USD$20.07
0.0061868 Eth
$475,559.00
23,696.494 LINK
0.1583%
53
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$19.96
0.0061513 Eth
$472,620.00
476,074.847 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
3.1802%
54
Binance
LINK-TRY$20.05
0.0061812 Eth
$456,647.00
22,709.870 LINK
0.1517%
55
Binance
LINK-EUR$20.04
0.0061807 Eth
$436,132.00
21,652.190 LINK
0.1446%
56
QMall
LINK-USDC$19.99
0.0061622 Eth
$430,989.00
21,426.985 LINK
0.1431%
57
Coinbase Exchange
LINK-BTC$20.00
0.0061665 Eth
$424,041.00
21,199.170 LINK
0.1416%
58
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$20.05
0.0061797 Eth
$368,708.00
18,399.467 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.1229%
59
Coins.ph
LINK-PHP$19.86
0.0061211 Eth
$320,882.00
16,202.502 LINK
0.1082%
60
BitMart
LINK-BTC$20.00
0.0061664 Eth
$267,915.00
13,392.460 LINK
0.0895%
61
BitDelta
LINK-USDT$20.03
0.0061651 Eth
$249,889.00
12,423.000 LINK
0.0830%
62
Hotcoin
LINK-BTC$20.02
0.0061689 Eth
$248,156.00
12,392.400 LINK
0.0828%
63
bitcastle
LINK-USDT$19.99
0.0061611 Eth
$199,907.00
9,947.510 LINK
0.0665%
64
Bitci TR
LINK-TRY$20.09
0.0061976 Eth
$191,553.00
9,494.820 LINK
0.0634%
65
LATOKEN
LINK-BTC$20.01
0.0061699 Eth
$181,720.00
9,080.494 LINK
0.0607%
66
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$19.96
0.0061513 Eth
$159,641.00
7,954.709 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0531%
67
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$20.01
0.0061681 Eth
$159,598.00
8,000.374 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0534%
68
DeGate
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$19.99
0.0061623 Eth
$150,875.00
7,518.229 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0502%
69
BitStorage
LINK-ETH$19.99
0.0061622 Eth
$131,086.00
6,557.170 LINK
0.0438%
70
PointPay
LINK-BTC$20.01
0.0061680 Eth
$129,900.00
6,465.442 LINK
0.0432%
71
Mercado Bitcoin
LINK-BRL$20.11
0.0062006 Eth
$111,953.00
5,566.452 LINK
0.0372%
72
Bitkub
LINK-THB$19.97
0.0061579 Eth
$110,654.00
5,540.079 LINK
0.0370%
73
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$19.96
0.0061447 Eth
$100,013.00
5,020.172 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0335%
74
BitMart
LINK-ETH$19.99
0.0061661 Eth
$90,075.00
4,505.120 LINK
0.0301%
75
KuCoin
LINK-USDC$19.94
0.0061476 Eth
$87,074.00
4,366.803 LINK
0.0292%
76
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$20.08
0.0061905 Eth
$86,807.00
86,806.217 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.5799%
77
Bitso
LINK-USD$19.97
0.0061613 Eth
$83,715.00
4,191.844 LINK
0.0280%
78
Hotcoin
LINK-ETH$19.98
0.0061603 Eth
$82,854.00
4,146.120 LINK
0.0277%
79
Binance US
LINK-USDT$20.00
0.0061652 Eth
$75,467.00
3,773.811 LINK
0.0252%
80
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$19.98
0.0061601 Eth
$52,614.00
2,637.203 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0176%
81
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$19.96
0.0061518 Eth
$52,443.00
2,606.220 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0174%
82
BTCMarkets
LINK-AUD$20.11
0.0061956 Eth
$46,903.00
2,331.998 LINK
0.0156%
83
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$20.01
0.0061692 Eth
$44,981.00
2,251.350 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0150%
84
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$19.94
0.0061480 Eth
$30,843.00
1,537.532 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0103%
85
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$19.96
0.0061513 Eth
$28,423.00
1,414.531 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0094%
86
Bitexen
LINK-TRY$19.87
0.0061198 Eth
$25,118.00
1,263.991 LINK
0.0084%
87
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XDAC17F958D2EE523A2206206994597C13D831EC7$19.96
0.0061550 Eth
$20,074.00
1,002.953 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0067%
88
LFJ
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$19.88
0.0061293 Eth
$18,307.40
932.179 0X5947BB275C521040051D82396192181B413227A3
0.0062%
89
Dex-Trade
LINK-ETH$20.01
0.0061719 Eth
$17,455.55
872.220 LINK
0.0058%
90
Pangolin
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$19.96
0.0061518 Eth
$11,476.50
584.564 0X5947BB275C521040051D82396192181B413227A3
0.0039%
91
CoinEx
LINK-USDC$19.96
0.0061532 Eth
$10,492.11
520.306 LINK
0.0035%
92
THENA FUSION
0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$20.00
0.0061636 Eth
$10,190.28
13.595 0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827
0.0001%
93
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X55D398326F99059FF775485246999027B3197955$20.01
0.0061686 Eth
$8,908.92
443.797 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0030%
94
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$19.97
0.0061522 Eth
$7,805.14
7,854.855 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.0525%
95
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$19.96
0.0061522 Eth
$7,700.30
7,750.087 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.0518%
96
Biswap V3
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$20.01
0.0061689 Eth
$7,695.31
383.797 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0026%
97
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X1BFD67037B42CF73ACF2047067BD4F2C47D9BFD6$20.00
0.0061662 Eth
$6,798.19
337.734 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0023%
98
CoinEx
LINK-BTC$20.00
0.0061613 Eth
$4,293.48
212.708 LINK
0.0014%
99
Ace
LINK-USDT$19.99
0.0061644 Eth
$4,008.97
199.490 LINK
0.0013%
100
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XB33EAAD8D922B1083446DC23F610C2567FB5180F$19.83
0.0061143 Eth
$2,632.86
129.561 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0009%

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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