ETH Price: $3,390.65 (+1.67%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

728,722 ( 0.050%)

Market

Price

$21.76 @ 0.006418 ETH (-2.16%)

Onchain Market Cap

$21,760,000,000.00

Circulating Supply Market Cap

$13,732,942,609.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
674.292907010104351451 LINK

Value
$14,672.61 ( ~4.3274 Eth) [0.0001%]
0x12478d1a60a910c9cbffb90648766a2bdd5918f5
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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 19681.82% |ETH 0.0003846 1568.75%

Market

Volume (24H):$1,005,927,862.00
Market Capitalization:$13,732,942,609.00
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$21.80
0.0064245 Eth
$44,993,666.00
2,063,929.640 LINK
12.8720%
2
Bybit
LINK-USDT$21.78
0.0064198 Eth
$35,051,770.00
1,629,951.848 LINK
10.1654%
3
WhiteBIT
LINK-USDT$21.80
0.0064248 Eth
$23,264,604.00
1,067,133.840 LINK
6.6553%
4
CoinW
LINK-USDT$21.78
0.0064198 Eth
$20,059,537.00
920,845.140 LINK
5.7430%
5
OKX
LINK-USDT$21.80
0.0064244 Eth
$18,896,453.00
878,335.025 LINK
5.4779%
6
DigiFinex
LINK-USDT$21.76
0.0064143 Eth
$14,509,426.00
666,654.050 LINK
4.1577%
7
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$21.86
0.0064466 Eth
$14,432,092.00
661,785.658 0X514910771AF9CA656AF840DFF83E8264ECF986CA
4.1273%
8
FameEX
LINK-USDT$21.84
0.0064368 Eth
$10,992,565.00
511,269.025 LINK
3.1886%
9
Azbit
LINK-USDT$21.78
0.0064191 Eth
$10,947,067.00
509,116.977 LINK
3.1752%
10
XT.COM
LINK-USDT$21.80
0.0064232 Eth
$10,921,899.00
508,076.650 LINK
3.1687%
11
Coinstore
LINK-USDT$21.77
0.0064173 Eth
$10,009,996.00
465,813.150 LINK
2.9051%
12
HTX
LINK-USDT$21.76
0.0064119 Eth
$9,267,304.00
431,763.346 LINK
2.6928%
13
Bitunix
LINK-USDT$21.80
0.0064242 Eth
$9,172,386.00
420,770.470 LINK
2.6242%
14
Bitstamp
LINK-EUR$21.79
0.0064229 Eth
$9,166,477.00
420,586.493 LINK
2.6231%
15
BYDFi
LINK-USDT$21.76
0.0064129 Eth
$7,271,861.00
334,195.870 LINK
2.0843%
16
Biconomy.com
LINK-USDT$21.77
0.0064178 Eth
$6,863,496.00
319,184.202 LINK
1.9906%
17
Binance
LINK-FDUSD$21.80
0.0064239 Eth
$6,425,043.00
298,146.510 LINK
1.8594%
18
KuCoin
LINK-USDT$21.80
0.0064250 Eth
$6,210,731.00
284,874.851 LINK
1.7767%
19
LATOKEN
LINK-USDT$21.76
0.0064146 Eth
$5,278,432.00
242,627.352 LINK
1.5132%
20
LBank
LINK-USDT$21.76
0.0064169 Eth
$4,722,935.00
217,018.260 LINK
1.3535%
21
QMall
LINK-USDT$21.75
0.0064117 Eth
$4,556,468.00
211,942.784 LINK
1.3218%
22
Kraken
LINK-USD$21.78
0.0064183 Eth
$3,744,991.00
171,954.861 LINK
1.0724%
23
Dex-Trade
LINK-USDT$21.76
0.0064140 Eth
$3,730,175.00
171,388.614 LINK
1.0689%
24
Bitvavo
LINK-EUR$21.80
0.0064224 Eth
$3,451,215.00
158,329.774 LINK
0.9874%
25
Coinbase Exchange
LINK-GBP$21.80
0.0064245 Eth
$3,009,435.00
138,048.360 LINK
0.8610%
26
CoinEx
LINK-USDT$21.82
0.0064295 Eth
$2,751,291.00
127,779.022 LINK
0.7969%
27
Bybit
LINK-USDC$21.79
0.0064213 Eth
$2,620,905.00
122,288.850 LINK
0.7627%
28
Hotcoin
LINK-USDT$21.81
0.0064261 Eth
$2,256,549.00
103,469.350 LINK
0.6453%
29
Dcoin
LINK-USDT$21.77
0.0064188 Eth
$2,075,292.00
95,335.000 LINK
0.5946%
30
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$21.74
0.0064069 Eth
$2,004,455.00
91,588.185 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.5712%
31
PointPay
LINK-USDT$21.78
0.0064192 Eth
$1,763,468.00
82,086.400 LINK
0.5119%
32
Coinbase Exchange
LINK-EUR$21.78
0.0064198 Eth
$1,748,979.00
80,287.020 LINK
0.5007%
33
Kraken
LINK-USDT$21.78
0.0064178 Eth
$1,737,038.00
79,765.196 LINK
0.4975%
34
Coinbase Exchange
LINK-ETH$21.75
0.0064097 Eth
$1,657,409.00
76,204.590 LINK
0.4753%
35
EXMO
LINK-USDT$21.78
0.0064181 Eth
$1,652,495.00
75,878.588 LINK
0.4732%
36
Phemex
LINK-USDT$21.72
0.0064098 Eth
$1,375,689.00
63,336.150 LINK
0.3950%
37
tanX
LINK-USDC$21.85
0.0064364 Eth
$970,994.00
45,138.120 LINK
0.2815%
38
WhiteBIT
LINK-BTC$21.79
0.0064225 Eth
$933,973.00
42,855.840 LINK
0.2673%
39
EarnBIT
LINK-USDT$21.72
0.0064081 Eth
$896,903.00
41,719.535 LINK
0.2602%
40
BitStorage
LINK-USDT$21.77
0.0064159 Eth
$894,784.00
41,102.400 LINK
0.2563%
41
Coinbase Exchange
LINK-USDT$21.76
0.0064140 Eth
$860,888.00
39,554.801 LINK
0.2467%
42
Bitbank
LINK-JPY$21.88
0.0064486 Eth
$808,992.00
36,971.028 LINK
0.2306%
43
WhiteBIT
LINK-TRY$21.92
0.0064612 Eth
$740,863.00
33,791.410 LINK
0.2107%
44
GMO Japan
LINK-JPY$21.78
0.0064180 Eth
$704,325.00
32,342.800 LINK
0.2017%
45
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$21.75
0.0064098 Eth
$694,129.00
31,822.835 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1985%
46
Gemini
LINK-USD$21.84
0.0064349 Eth
$540,190.00
24,739.090 LINK
0.1543%
47
Binance
LINK-EUR$21.74
0.0064108 Eth
$530,982.00
24,578.220 LINK
0.1533%
48
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$21.77
0.0064144 Eth
$518,689.00
23,526.268 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.1467%
49
itBit
LINK-USD$21.78
0.0064186 Eth
$510,302.00
23,429.858 LINK
0.1461%
50
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$21.78
0.0064175 Eth
$458,381.00
21,101.904 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1316%
51
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$21.88
0.0064490 Eth
$447,052.00
33,141.148 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.2067%
52
BitMart
LINK-BTC$21.77
0.0064160 Eth
$398,239.00
18,292.720 LINK
0.1141%
53
Bitbegin
LINK-USDT$21.76
0.0064126 Eth
$391,636.00
18,223.536 LINK
0.1137%
54
Slex
LINK-ETH$21.82
0.0064314 Eth
$378,780.00
17,405.250 LINK
0.1086%
55
Coinbase Exchange
LINK-BTC$21.81
0.0064254 Eth
$357,952.00
16,415.420 LINK
0.1024%
56
BigONE
LINK-USDT$21.80
0.0064233 Eth
$341,419.00
15,660.760 LINK
0.0977%
57
HashKey Exchange
LINK-USD$21.87
0.0064434 Eth
$319,063.00
14,899.893 LINK
0.0929%
58
OKX
LINK-USDC$21.78
0.0064198 Eth
$304,995.00
14,235.790 LINK
0.0888%
59
WhiteBIT
LINK-EUR$21.78
0.0064185 Eth
$298,900.00
13,723.660 LINK
0.0856%
60
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$21.77
0.0064143 Eth
$274,797.00
272,709.519 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
1.7008%
61
Nonkyc.io
LINK-USDT$21.72
0.0064006 Eth
$271,106.00
12,597.802 LINK
0.0786%
62
LATOKEN
LINK-BTC$21.75
0.0064088 Eth
$269,878.00
12,409.950 LINK
0.0774%
63
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$21.77
0.0064140 Eth
$228,169.00
10,477.303 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0653%
64
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$21.86
0.0064422 Eth
$226,540.00
10,458.318 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0652%
65
Bitci TR
LINK-TRY$21.84
0.0064349 Eth
$220,094.00
10,188.390 LINK
0.0635%
66
BitStorage
LINK-ETH$21.75
0.0064132 Eth
$207,992.00
9,563.150 LINK
0.0596%
67
PointPay
LINK-BTC$21.77
0.0064146 Eth
$205,453.00
9,521.094 LINK
0.0594%
68
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$21.83
0.0064343 Eth
$198,973.00
196,123.140 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
1.2232%
69
KuCoin
LINK-USDC$21.70
0.0063962 Eth
$195,942.00
9,027.970 LINK
0.0563%
70
BitMart
LINK-ETH$21.77
0.0064146 Eth
$181,331.00
8,331.060 LINK
0.0520%
71
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$21.79
0.0064219 Eth
$171,318.00
7,850.026 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0490%
72
Kraken
LINK-GBP$21.74
0.0064075 Eth
$166,093.00
7,639.247 LINK
0.0476%
73
Bitso
LINK-USD$21.75
0.0064129 Eth
$139,388.00
6,407.577 LINK
0.0400%
74
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$21.79
0.0064209 Eth
$133,678.00
6,108.002 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0381%
75
Bitkub
LINK-THB$21.91
0.0064603 Eth
$127,948.00
5,840.732 LINK
0.0364%
76
Mercado Bitcoin
LINK-BRL$22.02
0.0064908 Eth
$92,510.00
4,200.263 LINK
0.0262%
77
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$21.77
0.0064145 Eth
$85,001.00
3,891.218 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0243%
78
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$21.71
0.0063965 Eth
$81,905.00
3,770.704 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0235%
79
Hotcoin
LINK-BTC$21.81
0.0064261 Eth
$76,652.00
3,514.760 LINK
0.0219%
80
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$21.88
0.0064475 Eth
$76,582.00
3,529.244 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0220%
81
Binance US
LINK-USDT$21.75
0.0064108 Eth
$75,943.00
3,491.451 LINK
0.0218%
82
PancakeSwap (v2)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$21.78
0.0064200 Eth
$71,311.00
3,222.041 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0201%
83
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$21.71
0.0063965 Eth
$60,028.00
2,806.604 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0175%
84
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$21.88
0.0064474 Eth
$54,523.00
54,191.716 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.3380%
85
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$21.75
0.0064092 Eth
$53,064.00
2,441.155 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0152%
86
Uniswap V3 (Avalanche)
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$21.96
0.0064726 Eth
$43,792.00
1,970.242 0X5947BB275C521040051D82396192181B413227A3
0.0123%
87
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XDAC17F958D2EE523A2206206994597C13D831EC7$21.88
0.0064475 Eth
$41,275.00
1,884.762 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0118%
88
Bitexen
LINK-TRY$21.71
0.0063990 Eth
$40,070.00
1,845.419 LINK
0.0115%
89
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$21.77
0.0064166 Eth
$34,491.00
1,570.945 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0098%
90
Hotcoin
LINK-ETH$21.80
0.0064239 Eth
$25,710.00
1,179.290 LINK
0.0074%
91
Pangolin
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$21.87
0.0064444 Eth
$24,338.00
1,104.555 0X5947BB275C521040051D82396192181B413227A3
0.0069%
92
Gemini
LINK-BTC$21.75
0.0064091 Eth
$18,297.56
841.351 LINK
0.0052%
93
THENA FUSION
0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$21.77
0.0064162 Eth
$16,997.36
21.961 0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827
0.0001%
94
zondacrypto
LINK-USDC$21.81
0.0064287 Eth
$14,811.15
678.978 LINK
0.0042%
95
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X1BFD67037B42CF73ACF2047067BD4F2C47D9BFD6$21.89
0.0064510 Eth
$14,725.99
680.656 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0042%
96
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$21.88
0.0064513 Eth
$14,104.85
13,899.268 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.0867%
97
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$21.88
0.0064483 Eth
$13,462.50
614.449 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0038%
98
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$21.84
0.0064371 Eth
$12,036.00
557.742 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0035%
99
KuCoin
LINK-KCS$21.72
0.0064020 Eth
$9,746.84
448.679 LINK
0.0028%
100
Ace
LINK-USDT$21.80
0.0064247 Eth
$4,305.67
200.070 LINK
0.0012%

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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