ETH Price: $2,638.67 (+1.02%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

721,895 ( 0.013%)

Market

Price

$11.42 @ 0.004328 ETH (+3.45%)

Onchain Market Cap

$11,420,000,000.00

Circulating Supply Market Cap

$7,153,452,510.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
5 LINK

Value
$57.10 ( ~0.0216397058402431 Eth) [0.0000%]
0x2093a6d54331035c5ccca8f0f29c2a99bed14921
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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 10281.82% |ETH 0.0003846 1025.33%

Market

Volume (24H):$320,108,500.00
Market Capitalization:$7,153,452,510.00
Circulating Supply:626,849,971.00 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$11.40
0.0043176 Eth
$24,279,723.00
2,143,633.790 LINK
14.9400%
2
Coinbase Exchange
LINK-USD$11.43
0.0043339 Eth
$12,835,534.00
1,122,674.180 LINK
7.8245%
3
WhiteBIT
LINK-USDT$11.41
0.0043249 Eth
$12,723,239.00
1,114,704.810 LINK
7.7689%
4
HTX
LINK-USDT$11.44
0.0043331 Eth
$9,817,228.00
866,999.358 LINK
6.0425%
5
Bitget
LINK-USDT$11.43
0.0043272 Eth
$8,685,995.00
767,556.858 LINK
5.3495%
6
Bybit
LINK-USDT$11.44
0.0043328 Eth
$8,017,850.00
708,381.219 LINK
4.9371%
7
P2B
LINK-USDT$11.41
0.0043197 Eth
$4,976,327.00
436,297.550 LINK
3.0408%
8
Azbit
LINK-USDT$11.43
0.0043313 Eth
$4,827,746.00
426,994.960 LINK
2.9759%
9
WEEX
LINK-USDT$11.40
0.0043217 Eth
$4,135,202.00
364,819.690 LINK
2.5426%
10
Slex
LINK-USDT$11.43
0.0043328 Eth
$4,129,061.00
364,345.180 LINK
2.5393%
11
BTSE
LINK-USDT$11.43
0.0043328 Eth
$3,640,767.00
318,524.410 LINK
2.2200%
12
OKX
LINK-USDT$11.43
0.0043283 Eth
$3,625,566.00
320,259.075 LINK
2.2320%
13
Biconomy.com
LINK-USDT$11.43
0.0043312 Eth
$3,571,111.00
315,666.250 LINK
2.2000%
14
DigiFinex
LINK-USDT$11.44
0.0043351 Eth
$3,133,076.00
273,893.270 LINK
1.9089%
15
FameEX
LINK-USDT$11.44
0.0043339 Eth
$3,114,260.00
274,057.327 LINK
1.9100%
16
Deepcoin
LINK-USDT$11.44
0.0043361 Eth
$2,395,097.00
215,486.420 LINK
1.5018%
17
XT.COM
LINK-USDT$11.40
0.0043207 Eth
$2,188,052.00
193,097.840 LINK
1.3458%
18
Trubit
LINK-USDT$11.40
0.0043219 Eth
$2,186,578.00
192,876.920 LINK
1.3443%
19
CoinW
LINK-USDT$11.45
0.0043381 Eth
$2,176,300.00
190,144.910 LINK
1.3252%
20
Upbit
LINK-KRW$11.36
0.0043015 Eth
$2,172,108.00
191,247.433 LINK
1.3329%
21
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$11.44
0.0043329 Eth
$1,905,133.00
167,297.620 0X514910771AF9CA656AF840DFF83E8264ECF986CA
1.1660%
22
Gate.io
LINK-USDT$11.44
0.0043336 Eth
$1,788,467.00
157,955.540 LINK
1.1009%
23
Bitunix
LINK-USDT$11.42
0.0043309 Eth
$1,785,859.00
156,330.820 LINK
1.0895%
24
Coinstore
LINK-USDT$11.44
0.0043343 Eth
$1,767,920.00
156,045.600 LINK
1.0876%
25
Bitexen
LINK-TRY$11.45
0.0043403 Eth
$1,764,131.00
154,081.880 LINK
1.0739%
26
LBank
LINK-USDT$11.41
0.0043237 Eth
$1,737,393.00
152,282.080 LINK
1.0613%
27
AscendEX (BitMax)
LINK-USDT$11.40
0.0043174 Eth
$1,728,992.00
151,673.100 LINK
1.0571%
28
ProBit Global
LINK-USDT$11.42
0.0043248 Eth
$1,720,582.00
150,729.493 LINK
1.0505%
29
C-Patex
LINK-USDT$11.41
0.0043218 Eth
$1,672,620.00
146,630.069 LINK
1.0219%
30
KuCoin
LINK-USDT$11.44
0.0043335 Eth
$1,593,720.00
139,281.639 LINK
0.9707%
31
BYDFi
LINK-USDT$11.40
0.0043152 Eth
$1,197,028.00
105,009.180 LINK
0.7319%
32
Kraken
LINK-USD$11.43
0.0043278 Eth
$1,160,865.00
101,588.286 LINK
0.7080%
33
Niza Global
LINK-USD$11.43
0.0043306 Eth
$1,148,925.00
101,588.286 LINK
0.7080%
34
HashKey Global
LINK-USDT$11.44
0.0043342 Eth
$1,043,542.00
91,384.023 LINK
0.6369%
35
WhiteBIT
LINK-BTC$11.43
0.0043324 Eth
$1,001,118.00
87,558.080 LINK
0.6102%
36
Crypto.com Exchange
LINK-USDT$11.44
0.0043376 Eth
$971,880.00
84,930.900 LINK
0.5919%
37
Hotcoin
LINK-USDT$11.45
0.0043397 Eth
$963,420.00
84,144.580 LINK
0.5864%
38
Azbit
LINK-ETH$11.39
0.0043173 Eth
$870,591.00
76,791.136 LINK
0.5352%
39
Dex-Trade
LINK-USDT$11.44
0.0043310 Eth
$825,431.00
72,179.370 LINK
0.5031%
40
Bitexen
LINK-USDT$11.39
0.0043169 Eth
$806,022.00
70,749.090 LINK
0.4931%
41
Bitvavo
LINK-EUR$11.40
0.0043187 Eth
$734,865.00
64,444.322 LINK
0.4491%
42
FMFW.io
LINK-USDT$11.41
0.0043226 Eth
$642,046.00
56,280.620 LINK
0.3922%
43
HitBTC
LINK-USDT$11.44
0.0043355 Eth
$636,355.00
56,283.620 LINK
0.3923%
44
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$11.40
0.0043194 Eth
$588,203.00
51,911.937 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.3618%
45
FMCPAY
LINK-BTC$11.39
0.0043206 Eth
$572,504.00
50,431.300 LINK
0.3515%
46
BigONE
LINK-USDT$11.44
0.0043370 Eth
$560,045.00
48,952.420 LINK
0.3412%
47
Bithumb
LINK-KRW$11.36
0.0043079 Eth
$533,027.00
46,901.241 LINK
0.3269%
48
tanX
LINK-USDC$11.40
0.0043142 Eth
$497,264.00
43,915.880 LINK
0.3061%
49
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$11.38
0.0043106 Eth
$448,106.00
39,578.876 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.2758%
50
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$11.37
0.0043083 Eth
$423,730.00
37,378.813 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.2605%
51
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$11.40
0.0043212 Eth
$415,436.00
36,612.860 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.2552%
52
Gemini
LINK-USD$11.33
0.0042913 Eth
$410,771.00
36,253.115 LINK
0.2527%
53
PointPay
LINK-USDT$11.40
0.0043219 Eth
$400,836.00
35,380.932 LINK
0.2466%
54
EXMO
LINK-USDT$11.43
0.0043322 Eth
$390,449.00
34,155.979 LINK
0.2380%
55
Pionex
LINK-USDT$11.42
0.0043290 Eth
$330,477.00
29,173.050 LINK
0.2033%
56
Phemex
LINK-USDT$11.41
0.0043256 Eth
$247,001.00
21,651.860 LINK
0.1509%
57
ProBit Global
LINK-BTC$11.41
0.0043231 Eth
$227,006.00
19,896.835 LINK
0.1387%
58
BitMart
LINK-BTC$11.42
0.0043264 Eth
$194,260.00
17,016.360 LINK
0.1186%
59
WhiteBIT
LINK-EUR$11.44
0.0043336 Eth
$180,424.00
15,775.780 LINK
0.1099%
60
Bybit
LINK-USDC$11.43
0.0043285 Eth
$179,968.00
15,850.970 LINK
0.1105%
61
BYDFi
LINK-USDC$11.41
0.0043247 Eth
$158,317.00
13,872.320 LINK
0.0967%
62
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$11.38
0.0043118 Eth
$141,925.00
12,473.662 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0869%
63
Coinbase Exchange
LINK-GBP$11.41
0.0043228 Eth
$137,898.00
12,089.390 LINK
0.0843%
64
Hotcoin
LINK-ETH$11.43
0.0043302 Eth
$129,416.00
11,318.860 LINK
0.0789%
65
BitDelta
LINK-USDT$11.40
0.0043219 Eth
$121,779.00
10,768.000 LINK
0.0750%
66
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$11.37
0.0043083 Eth
$121,231.00
121,045.696 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.8436%
67
Hotcoin
LINK-BTC$11.45
0.0043352 Eth
$116,052.00
10,138.290 LINK
0.0707%
68
HashKey Exchange
LINK-USD$11.44
0.0043327 Eth
$114,037.00
9,958.562 LINK
0.0694%
69
Coinbase Exchange
LINK-ETH$11.44
0.0043317 Eth
$112,992.00
9,879.040 LINK
0.0689%
70
Bitci TR
LINK-TRY$11.52
0.0043645 Eth
$112,882.00
9,985.020 LINK
0.0696%
71
Coinbase Exchange
LINK-BTC$11.39
0.0043132 Eth
$105,550.00
9,267.900 LINK
0.0646%
72
Slex
LINK-BTC$11.42
0.0043285 Eth
$82,734.00
7,277.400 LINK
0.0507%
73
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$11.37
0.0043083 Eth
$63,789.00
5,622.118 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0392%
74
GMO Japan
LINK-JPY$11.48
0.0043495 Eth
$62,054.00
5,406.800 LINK
0.0377%
75
Slex
LINK-ETH$11.40
0.0043213 Eth
$61,805.00
5,451.490 LINK
0.0380%
76
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$11.36
0.0043069 Eth
$48,921.00
48,683.615 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.3393%
77
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$11.42
0.0043281 Eth
$45,056.00
3,974.291 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0277%
78
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$11.40
0.0043212 Eth
$40,811.00
40,586.312 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.2829%
79
Bitkub
LINK-THB$11.38
0.0043098 Eth
$37,470.00
3,292.688 LINK
0.0229%
80
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$11.43
0.0043303 Eth
$29,927.00
2,632.790 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0183%
81
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$11.36
0.0043017 Eth
$29,094.00
2,570.529 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0179%
82
Bitcointry
LINK-USDT$11.40
0.0043238 Eth
$28,412.00
2,502.495 LINK
0.0174%
83
KuCoin
LINK-BTC$11.42
0.0043236 Eth
$24,715.00
2,164.946 LINK
0.0151%
84
EXMO
LINK-BTC$11.43
0.0043303 Eth
$24,585.00
2,151.593 LINK
0.0150%
85
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$11.41
0.0043238 Eth
$16,615.29
1,466.222 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0102%
86
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$11.39
0.0043137 Eth
$16,202.13
1,429.094 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0100%
87
KuCoin
LINK-KCS$11.43
0.0043280 Eth
$15,940.08
1,394.866 LINK
0.0097%
88
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$11.38
0.0043123 Eth
$12,352.17
1,087.117 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0076%
89
Pangolin
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$11.49
0.0043518 Eth
$11,664.06
1,041.638 0X5947BB275C521040051D82396192181B413227A3
0.0073%
90
Coinone
LINK-KRW$11.34
0.0042932 Eth
$10,069.44
888.296 LINK
0.0062%
91
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X1BFD67037B42CF73ACF2047067BD4F2C47D9BFD6$11.39
0.0043171 Eth
$9,445.47
828.624 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0058%
92
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$11.35
0.0043013 Eth
$8,278.73
8,173.307 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.0570%
93
LFJ
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$11.42
0.0043270 Eth
$7,577.79
673.321 0X5947BB275C521040051D82396192181B413227A3
0.0047%
94
PancakeSwap V3 (Arbitrum)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$11.36
0.0043031 Eth
$2,195.71
194.086 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0014%
95
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$11.37
0.0043077 Eth
$1,086.14
95.975 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0007%
96
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X61299774020DA444AF134C82FA83E3810B309991$11.53
0.0043708 Eth
$815.05
70.695 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0005%
97
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XB33EAAD8D922B1083446DC23F610C2567FB5180F$11.39
0.0043097 Eth
$215.14
19.091 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0001%
98
Balancer V2 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XDF7837DE1F2FA4631D716CF2502F8B230F1DCC32$11.40
0.0043196 Eth
$195.69
17.000 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0001%
99
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$11.42
0.0043285 Eth
$184.34
16.238 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0001%
100
CEX.IO
LINK-USDT$11.42
0.0043294 Eth
$145.36
12.754 LINK
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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