ETH Price: $3,247.12 (-0.09%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

725,464 ( 0.001%)

Market

Price

$19.87 @ 0.006119 ETH (-1.06%)

Onchain Market Cap

$19,870,000,000.00

Circulating Supply Market Cap

$12,542,238,929.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
0 LINK

Value
$0.00
0xb98d0b44d8d3d26bcb4df4e5be31e2c2c425231d
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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 17963.64% |ETH 0.0003846 1491%

Market

Volume (24H):$886,997,387.00
Market Capitalization:$12,542,238,929.00
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$19.90
0.0061341 Eth
$40,684,048.00
2,044,424.520 LINK
11.1063%
2
Bitget
LINK-USDT$19.90
0.0061327 Eth
$26,979,802.00
1,356,933.430 LINK
7.3715%
3
Bybit
LINK-USDT$19.89
0.0061316 Eth
$22,036,956.00
1,107,827.461 LINK
6.0183%
4
P2B
LINK-USDT$19.96
0.0061192 Eth
$19,710,546.00
987,696.950 LINK
5.3657%
5
MEXC
LINK-USDT$19.91
0.0061377 Eth
$18,689,386.00
938,476.490 LINK
5.0983%
6
Slex
LINK-USDT$19.88
0.0061285 Eth
$17,996,601.00
904,067.130 LINK
4.9113%
7
OKX
LINK-USDT$19.90
0.0061325 Eth
$13,848,680.00
695,420.983 LINK
3.7779%
8
DigiFinex
LINK-USDT$19.90
0.0061345 Eth
$13,475,152.00
677,081.540 LINK
3.6782%
9
HTX
LINK-USDT$19.90
0.0061335 Eth
$11,645,042.00
583,779.617 LINK
3.1714%
10
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$19.87
0.0061153 Eth
$11,017,183.00
552,714.614 0X514910771AF9CA656AF840DFF83E8264ECF986CA
3.0026%
11
XT.COM
LINK-USDT$19.96
0.0061240 Eth
$10,996,908.00
552,266.200 LINK
3.0002%
12
Azbit
LINK-USDT$19.89
0.0061244 Eth
$10,780,145.00
541,799.471 LINK
2.9433%
13
Coinstore
LINK-USDT$19.85
0.0061194 Eth
$9,372,135.00
471,219.650 LINK
2.5599%
14
CoinW
LINK-USDT$19.87
0.0061248 Eth
$8,565,685.00
431,063.510 LINK
2.3418%
15
Bitunix
LINK-USDT$19.87
0.0061240 Eth
$8,169,414.00
411,278.560 LINK
2.2343%
16
Hotcoin
LINK-USDT$19.86
0.0061225 Eth
$7,084,495.00
356,659.730 LINK
1.9376%
17
Binance
LINK-FDUSD$19.85
0.0061076 Eth
$6,471,193.00
325,311.040 LINK
1.7673%
18
KuCoin
LINK-USDT$19.90
0.0061334 Eth
$6,393,173.00
321,256.822 LINK
1.7452%
19
BYDFi
LINK-USDT$19.90
0.0061190 Eth
$6,123,615.00
307,732.020 LINK
1.6718%
20
PancakeSwap (v2)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$19.83
0.0061104 Eth
$6,015,274.00
37,279.543 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.2025%
21
Binance
LINK-USDC$19.90
0.0061180 Eth
$5,498,918.00
275,847.110 LINK
1.4985%
22
LATOKEN
LINK-USDT$19.96
0.0061286 Eth
$5,431,567.00
272,134.178 LINK
1.4784%
23
LBank
LINK-USDT$19.86
0.0061122 Eth
$5,352,871.00
269,521.840 LINK
1.4642%
24
QMall
LINK-USDT$19.85
0.0061121 Eth
$4,314,319.00
216,773.047 LINK
1.1776%
25
BTSE
LINK-USDT$19.90
0.0061266 Eth
$4,100,142.00
206,026.707 LINK
1.1192%
26
Dex-Trade
LINK-USDT$19.92
0.0061325 Eth
$3,516,635.00
176,537.340 LINK
0.9590%
27
Kraken
LINK-USD$19.91
0.0061359 Eth
$2,644,093.00
132,811.950 LINK
0.7215%
28
FMCPAY
LINK-USDT$19.87
0.0061087 Eth
$2,422,880.00
121,669.515 LINK
0.6610%
29
Biconomy.com
LINK-USDT$19.86
0.0061137 Eth
$2,045,264.00
102,571.190 LINK
0.5572%
30
CoinEx
LINK-USDT$19.88
0.0061291 Eth
$1,866,075.00
93,408.191 LINK
0.5074%
31
PointPay
LINK-USDT$19.88
0.0061286 Eth
$1,704,369.00
85,691.633 LINK
0.4655%
32
EXMO
LINK-USDT$19.86
0.0061204 Eth
$1,606,614.00
80,909.334 LINK
0.4395%
33
Coinbase Exchange
LINK-EUR$19.87
0.0061182 Eth
$1,400,651.00
70,478.140 LINK
0.3829%
34
Bitvavo
LINK-EUR$19.89
0.0061299 Eth
$1,370,441.00
68,911.903 LINK
0.3744%
35
Coinbase Exchange
LINK-GBP$19.88
0.0061206 Eth
$1,264,170.00
63,585.970 LINK
0.3454%
36
Phemex
LINK-USDT$19.91
0.0061358 Eth
$1,249,185.00
62,754.030 LINK
0.3409%
37
FMCPAY
LINK-ETH$19.87
0.0061251 Eth
$1,206,174.00
60,644.480 LINK
0.3295%
38
BigONE
LINK-USDT$19.78
0.0061147 Eth
$1,169,357.00
59,123.430 LINK
0.3212%
39
FMCPAY
LINK-BTC$19.88
0.0061269 Eth
$1,090,305.00
54,693.900 LINK
0.2971%
40
Bybit
LINK-USDC$19.92
0.0061399 Eth
$1,014,973.00
50,806.569 LINK
0.2760%
41
Trubit
LINK-USDT$19.85
0.0061039 Eth
$866,966.00
43,526.710 LINK
0.2365%
42
tanX
LINK-USDC$19.93
0.0061341 Eth
$865,950.00
43,350.230 LINK
0.2355%
43
BitStorage
LINK-USDT$19.90
0.0061187 Eth
$848,016.00
42,609.170 LINK
0.2315%
44
Gemini
LINK-USD$19.90
0.0061344 Eth
$842,902.00
42,353.714 LINK
0.2301%
45
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$19.96
0.0061533 Eth
$800,895.00
40,039.305 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.2175%
46
Azbit
LINK-ETH$19.90
0.0061167 Eth
$781,800.00
39,251.955 LINK
0.2132%
47
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$19.90
0.0061328 Eth
$766,426.00
38,694.897 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.2102%
48
Bitbank
LINK-JPY$19.96
0.0061518 Eth
$745,231.00
37,341.043 LINK
0.2029%
49
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$19.85
0.0061192 Eth
$702,048.00
704,476.737 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
3.8271%
50
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$19.86
0.0061220 Eth
$695,998.00
34,929.333 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.1898%
51
EarnBIT
LINK-USDT$19.80
0.0060973 Eth
$632,090.00
31,808.053 LINK
0.1728%
52
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$19.84
0.0061160 Eth
$590,972.00
29,754.320 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1616%
53
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$19.84
0.0061152 Eth
$540,098.00
27,151.733 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1475%
54
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$19.84
0.0061166 Eth
$531,374.00
533,719.339 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
2.8994%
55
Binance
LINK-TRY$19.99
0.0061458 Eth
$511,508.00
25,660.180 LINK
0.1394%
56
OKX
LINK-USDC$19.90
0.0061332 Eth
$508,312.00
25,534.277 LINK
0.1387%
57
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$19.86
0.0061136 Eth
$500,510.00
38,182.036 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.2074%
58
Tokpie
LINK-USDT$19.87
0.0061085 Eth
$495,415.00
24,937.734 LINK
0.1355%
59
Binance
LINK-EUR$19.88
0.0061186 Eth
$488,754.00
24,539.830 LINK
0.1333%
60
Coinbase Exchange
LINK-BTC$19.88
0.0061195 Eth
$435,140.00
21,882.920 LINK
0.1189%
61
itBit
LINK-USD$19.81
0.0061132 Eth
$434,656.00
21,941.218 LINK
0.1192%
62
QMall
LINK-USDC$19.85
0.0061191 Eth
$432,433.00
21,686.039 LINK
0.1178%
63
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$19.84
0.0061048 Eth
$414,963.00
20,800.921 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.1130%
64
GMO Japan
LINK-JPY$19.93
0.0061359 Eth
$399,959.00
20,066.900 LINK
0.1090%
65
Coinbase Exchange
LINK-ETH$19.85
0.0061103 Eth
$355,026.00
17,887.050 LINK
0.0972%
66
Coinbase Exchange
LINK-USDT$19.91
0.0061294 Eth
$333,331.00
16,741.816 LINK
0.0909%
67
Coins.ph
LINK-PHP$19.94
0.0061429 Eth
$323,252.00
16,225.291 LINK
0.0881%
68
BitDelta
LINK-USDT$19.89
0.0061149 Eth
$297,323.00
14,949.000 LINK
0.0812%
69
BitMart
LINK-BTC$19.88
0.0061186 Eth
$277,364.00
13,953.500 LINK
0.0758%
70
Hotcoin
LINK-BTC$19.99
0.0061292 Eth
$275,465.00
13,783.370 LINK
0.0749%
71
bitcastle
LINK-USDT$19.90
0.0061277 Eth
$211,511.00
10,616.490 LINK
0.0577%
72
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$19.86
0.0061222 Eth
$206,291.00
10,378.349 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0564%
73
Bitci TR
LINK-TRY$19.79
0.0060932 Eth
$199,273.00
9,982.970 LINK
0.0542%
74
LATOKEN
LINK-BTC$19.88
0.0061283 Eth
$194,511.00
9,782.236 LINK
0.0531%
75
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$19.83
0.0061126 Eth
$190,437.00
9,570.977 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0520%
76
DeGate
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$19.88
0.0061283 Eth
$176,216.00
8,873.135 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0482%
77
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$19.86
0.0061127 Eth
$163,414.00
8,239.441 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0448%
78
Mercado Bitcoin
LINK-BRL$19.92
0.0061405 Eth
$159,767.00
8,019.578 LINK
0.0436%
79
Binance US
LINK-USDT$19.87
0.0061171 Eth
$147,327.00
7,414.514 LINK
0.0403%
80
PointPay
LINK-BTC$19.87
0.0061257 Eth
$142,327.00
7,148.554 LINK
0.0388%
81
Bitkub
LINK-THB$19.91
0.0061372 Eth
$124,631.00
6,259.716 LINK
0.0340%
82
BitStorage
LINK-ETH$19.84
0.0061080 Eth
$117,166.00
5,905.360 LINK
0.0321%
83
KuCoin
LINK-USDC$19.90
0.0061324 Eth
$111,791.00
5,618.366 LINK
0.0305%
84
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$19.84
0.0061146 Eth
$110,955.00
5,617.765 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0305%
85
BitMart
LINK-ETH$19.89
0.0061204 Eth
$101,474.00
5,102.500 LINK
0.0277%
86
Kanga
LINK-PLN$19.96
0.0061213 Eth
$96,666.00
0.000 LINK
0.0000%
87
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$19.96
0.0061533 Eth
$96,166.00
95,870.458 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.5208%
88
Hotcoin
LINK-ETH$19.88
0.0061238 Eth
$93,615.00
4,709.160 LINK
0.0256%
89
Kraken
LINK-GBP$19.89
0.0061290 Eth
$86,748.00
4,362.240 LINK
0.0237%
90
Bitso
LINK-USD$19.85
0.0060994 Eth
$84,187.00
4,240.866 LINK
0.0230%
91
EXMO
LINK-BTC$19.90
0.0061335 Eth
$73,865.00
3,711.961 LINK
0.0202%
92
Uniswap V3 (Avalanche)
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$19.88
0.0061267 Eth
$65,890.00
3,404.166 0X5947BB275C521040051D82396192181B413227A3
0.0185%
93
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$19.89
0.0061308 Eth
$51,900.00
2,611.020 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0142%
94
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$19.86
0.0061137 Eth
$50,187.00
3,835.547 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.0208%
95
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$19.91
0.0061260 Eth
$45,964.00
2,404.253 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0131%
96
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$19.87
0.0061166 Eth
$35,882.00
1,802.907 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0098%
97
zondacrypto
LINK-PLN$19.95
0.0061172 Eth
$31,079.00
1,558.084 LINK
0.0085%
98
Bitexen
LINK-TRY$19.74
0.0060834 Eth
$29,334.00
1,485.892 LINK
0.0081%
99
LFJ
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$19.89
0.0061230 Eth
$28,497.00
1,469.359 0X5947BB275C521040051D82396192181B413227A3
0.0080%
100
Dex-Trade
LINK-ETH$19.92
0.0061221 Eth
$15,647.52
785.420 LINK
0.0043%

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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