ETH Price: $2,672.04 (+1.11%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

733,352 ( 0.029%)

Market

Price

$18.79 @ 0.007032 ETH (+0.51%)

Onchain Market Cap

$18,790,000,000.00

Circulating Supply Market Cap

$11,979,980,595.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
0 LINK

Value
$0.00
0x3fd825387c36214cf9c3acae18c0647f6ff77a5f
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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 16981.82% |ETH 0.0003846 1728.39%

Market

Volume (24H):$642,365,811.00
Market Capitalization:$11,979,980,595.00
Circulating Supply:638,099,970.00 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$18.79
0.0070178 Eth
$34,252,484.00
1,822,522.300 LINK
11.3808%
2
Bybit
LINK-USDT$18.81
0.0070252 Eth
$30,050,138.00
1,640,138.887 LINK
10.2419%
3
HTX
LINK-USDT$18.80
0.0070195 Eth
$17,706,278.00
958,254.771 LINK
5.9839%
4
P2B
LINK-USDT$18.82
0.0070395 Eth
$16,726,257.00
888,634.450 LINK
5.5491%
5
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$18.86
0.0070426 Eth
$16,141,595.00
860,524.063 0X514910771AF9CA656AF840DFF83E8264ECF986CA
5.3736%
6
DigiFinex
LINK-USDT$18.81
0.0070255 Eth
$10,680,207.00
567,651.030 LINK
3.5447%
7
OKX
LINK-USDT$18.79
0.0070167 Eth
$10,452,187.00
567,725.836 LINK
3.5452%
8
Gate.io
LINK-USDT$18.79
0.0070168 Eth
$10,363,230.00
566,190.020 LINK
3.5356%
9
MEXC
LINK-USDT$18.83
0.0070440 Eth
$8,868,818.00
470,940.420 LINK
2.9408%
10
XT.COM
LINK-USDT$18.87
0.0070782 Eth
$8,351,451.00
454,144.770 LINK
2.8359%
11
Coinstore
LINK-USDT$18.80
0.0070334 Eth
$7,227,603.00
392,927.360 LINK
2.4536%
12
BTSE
LINK-USDT$18.79
0.0070149 Eth
$6,866,330.00
365,469.162 LINK
2.2822%
13
Binance
LINK-USDC$18.57
0.0069914 Eth
$6,136,257.00
334,705.640 LINK
2.0901%
14
CoinW
LINK-USDT$18.85
0.0070517 Eth
$6,100,208.00
323,647.470 LINK
2.0210%
15
Bitunix
LINK-USDT$18.83
0.0070415 Eth
$6,086,873.00
323,174.540 LINK
2.0181%
16
Binance
LINK-FDUSD$18.65
0.0070225 Eth
$5,809,249.00
314,844.570 LINK
1.9661%
17
Hotcoin
LINK-USDT$18.83
0.0070440 Eth
$5,595,634.00
297,132.090 LINK
1.8555%
18
KuCoin
LINK-USDT$18.80
0.0070184 Eth
$5,503,906.00
292,825.839 LINK
1.8286%
19
BYDFi
LINK-USDT$18.82
0.0070408 Eth
$4,819,454.00
256,022.180 LINK
1.5987%
20
Kraken
LINK-USD$18.80
0.0070187 Eth
$4,389,551.00
233,511.828 LINK
1.4582%
21
Bitvavo
LINK-EUR$18.87
0.0070594 Eth
$4,194,129.00
222,273.233 LINK
1.3880%
22
LBank
LINK-USDT$18.81
0.0070359 Eth
$4,185,205.00
222,444.260 LINK
1.3891%
23
LATOKEN
LINK-USDT$18.85
0.0070518 Eth
$4,127,163.00
218,958.359 LINK
1.3673%
24
Coinbase Exchange
LINK-EUR$18.82
0.0070395 Eth
$3,742,436.00
198,876.950 LINK
1.2419%
25
QMall
LINK-USDT$18.70
0.0070276 Eth
$3,433,850.00
187,004.651 LINK
1.1678%
26
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$18.72
0.0070034 Eth
$3,123,685.00
166,687.367 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
1.0409%
27
Dex-Trade
LINK-USDT$18.80
0.0070339 Eth
$2,814,812.00
149,701.272 LINK
0.9348%
28
WhiteBIT
LINK-USDT$18.91
0.0070750 Eth
$2,586,510.00
136,774.410 LINK
0.8541%
29
FMCPAY
LINK-USDT$18.81
0.0070383 Eth
$2,461,174.00
133,434.519 LINK
0.8332%
30
Coinbase Exchange
LINK-GBP$18.79
0.0070256 Eth
$1,966,217.00
104,630.990 LINK
0.6534%
31
Biconomy.com
LINK-USDT$18.80
0.0070349 Eth
$1,567,047.00
85,005.660 LINK
0.5308%
32
FMCPAY
LINK-ETH$18.83
0.0070298 Eth
$1,348,173.00
71,732.960 LINK
0.4479%
33
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$18.74
0.0070094 Eth
$1,291,652.00
69,272.686 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.4326%
34
CoinEx
LINK-USDT$18.81
0.0070359 Eth
$1,274,857.00
69,103.281 LINK
0.4315%
35
PointPay
LINK-USDT$18.65
0.0070148 Eth
$1,267,436.00
68,985.195 LINK
0.4308%
36
FMCPAY
LINK-BTC$18.64
0.0070108 Eth
$1,116,653.00
60,330.900 LINK
0.3767%
37
Trubit
LINK-USDT$18.89
0.0070686 Eth
$965,196.00
52,117.550 LINK
0.3254%
38
Phemex
LINK-USDT$18.84
0.0070470 Eth
$901,723.00
47,855.990 LINK
0.2988%
39
EXMO
LINK-USDT$18.81
0.0070230 Eth
$872,561.00
46,387.466 LINK
0.2897%
40
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$18.88
0.0070619 Eth
$838,732.00
45,841.550 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.2863%
41
Tokpie
LINK-USDT$18.64
0.0069619 Eth
$834,948.00
44,785.097 LINK
0.2797%
42
tanX
LINK-USDC$18.83
0.0070380 Eth
$832,900.00
45,063.200 LINK
0.2814%
43
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$18.83
0.0070419 Eth
$798,153.00
42,631.963 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.2662%
44
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$18.74
0.0069977 Eth
$770,004.00
82,501.223 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.5152%
45
Bitbank
LINK-JPY$18.85
0.0070513 Eth
$764,010.00
40,536.363 LINK
0.2531%
46
BigONE
LINK-USDT$18.87
0.0070608 Eth
$760,875.00
40,315.590 LINK
0.2518%
47
BitStorage
LINK-USDT$18.78
0.0070138 Eth
$706,684.00
37,620.050 LINK
0.2349%
48
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$18.73
0.0070058 Eth
$612,535.00
32,896.544 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.2054%
49
Binance
LINK-TRY$18.63
0.0070172 Eth
$608,793.00
32,986.850 LINK
0.2060%
50
WhiteBIT
LINK-TRY$18.86
0.0070554 Eth
$600,769.00
31,845.960 LINK
0.1989%
51
Binance
LINK-EUR$18.56
0.0069894 Eth
$533,325.00
29,060.530 LINK
0.1815%
52
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$18.80
0.0070319 Eth
$515,522.00
27,534.315 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1719%
53
Bybit
LINK-USDC$18.84
0.0070339 Eth
$503,989.00
27,388.694 LINK
0.1710%
54
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$18.84
0.0070459 Eth
$502,823.00
27,715.393 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.1731%
55
EarnBIT
LINK-USDT$18.80
0.0070329 Eth
$492,179.00
26,755.655 LINK
0.1671%
56
QMall
LINK-USDC$18.69
0.0070140 Eth
$484,755.00
26,457.070 LINK
0.1652%
57
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$18.73
0.0070048 Eth
$465,213.00
456,630.003 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
2.8514%
58
HashKey Exchange
LINK-USD$18.80
0.0070308 Eth
$401,044.00
21,674.219 LINK
0.1353%
59
WhiteBIT
LINK-BTC$18.73
0.0070291 Eth
$355,095.00
18,959.650 LINK
0.1184%
60
Gemini
LINK-USD$18.83
0.0070313 Eth
$348,658.00
18,516.632 LINK
0.1156%
61
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$18.78
0.0070256 Eth
$324,653.00
17,404.276 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1087%
62
WhiteBIT
LINK-EUR$18.83
0.0070432 Eth
$312,191.00
16,577.440 LINK
0.1035%
63
Slex
LINK-ETH$18.88
0.0070614 Eth
$310,361.00
16,467.550 LINK
0.1028%
64
Coinbase Exchange
LINK-USDT$18.83
0.0070448 Eth
$299,493.00
15,901.524 LINK
0.0993%
65
BitDelta
LINK-USDT$18.82
0.0070349 Eth
$289,867.00
15,733.000 LINK
0.0982%
66
BitMart
LINK-BTC$18.82
0.0070265 Eth
$270,416.00
14,369.400 LINK
0.0897%
67
OKX
LINK-USDC$18.82
0.0070274 Eth
$266,632.00
14,405.565 LINK
0.0900%
68
itBit
LINK-USD$18.78
0.0070165 Eth
$262,251.00
13,964.393 LINK
0.0872%
69
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$18.85
0.0070392 Eth
$248,410.00
13,599.441 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0849%
70
LATOKEN
LINK-BTC$18.75
0.0070311 Eth
$241,545.00
12,882.229 LINK
0.0804%
71
DeGate
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$19.02
0.0071131 Eth
$216,523.00
11,638.935 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0727%
72
Bitso
LINK-USD$18.81
0.0070238 Eth
$213,731.00
11,362.433 LINK
0.0710%
73
BitStorage
LINK-ETH$18.82
0.0070268 Eth
$209,210.00
11,117.930 LINK
0.0694%
74
Hotcoin
LINK-BTC$18.80
0.0070283 Eth
$194,173.00
10,328.780 LINK
0.0645%
75
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$18.73
0.0069946 Eth
$185,146.00
181,080.951 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
1.1308%
76
BYDFi
LINK-USDC$18.88
0.0070610 Eth
$176,227.00
9,334.790 LINK
0.0583%
77
Coinbase Exchange
LINK-BTC$18.89
0.0070591 Eth
$173,415.00
9,178.410 LINK
0.0573%
78
bitcastle
LINK-USDT$18.78
0.0070200 Eth
$171,529.00
9,323.440 LINK
0.0582%
79
GMO Japan
LINK-JPY$18.65
0.0069738 Eth
$171,158.00
9,179.000 LINK
0.0573%
80
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$18.84
0.0070476 Eth
$162,291.00
8,803.507 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0550%
81
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$18.78
0.0070218 Eth
$157,666.00
8,460.700 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0528%
82
Kraken
LINK-GBP$18.78
0.0070137 Eth
$132,193.00
7,037.342 LINK
0.0439%
83
CoinTR
LINK-TRY$18.87
0.0070588 Eth
$129,629.00
6,984.810 LINK
0.0436%
84
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XDAC17F958D2EE523A2206206994597C13D831EC7$18.74
0.0069977 Eth
$128,433.00
7,055.507 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0441%
85
OKX
LINK-EUR$18.81
0.0070235 Eth
$127,620.00
6,847.456 LINK
0.0428%
86
Uniswap V4 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$18.74
0.0070083 Eth
$113,371.00
111,300.399 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.6950%
87
KuCoin
LINK-USDC$18.89
0.0070519 Eth
$104,710.00
5,544.466 LINK
0.0346%
88
PointPay
LINK-BTC$18.86
0.0070702 Eth
$81,421.00
4,427.333 LINK
0.0276%
89
BitMart
LINK-ETH$18.83
0.0070320 Eth
$80,421.00
4,270.140 LINK
0.0267%
90
PancakeSwap (v2)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$18.76
0.0070099 Eth
$67,768.00
3,677.086 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0230%
91
Uniswap V4 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$18.82
0.0070410 Eth
$67,737.00
3,612.089 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0226%
92
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$18.78
0.0070150 Eth
$65,726.00
3,503.246 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0219%
93
KuCoin
LINK-BTC$18.80
0.0070184 Eth
$65,039.00
3,460.354 LINK
0.0216%
94
Binance US
LINK-USDT$18.81
0.0070382 Eth
$54,136.00
2,877.632 LINK
0.0180%
95
Hotcoin
LINK-ETH$18.84
0.0070667 Eth
$53,098.00
2,817.850 LINK
0.0176%
96
Uniswap V3 (Avalanche)
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$18.78
0.0070111 Eth
$52,682.00
2,837.633 0X5947BB275C521040051D82396192181B413227A3
0.0177%
97
Bitexen
LINK-TRY$18.56
0.0069734 Eth
$33,477.00
1,803.900 LINK
0.0113%
98
Dex-Trade
LINK-ETH$18.83
0.0070318 Eth
$29,830.00
1,584.120 LINK
0.0099%
99
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$18.75
0.0070150 Eth
$28,000.00
1,506.001 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0094%
100
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFA7F8980B0F1E64A2062791CC3B0871572F1F7F0$18.89
0.0070522 Eth
$27,942.00
1,472.754 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0092%

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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