ETH Price: $3,256.77 (+0.20%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

725,466 ( 0.007%)

Market

Price

$19.87 @ 0.006101 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
0.85225899 LINK

Value
$16.93 ( ~0.00519839915768065 Eth) [0.0000%]
0x31C86D9973B303E5C932aDBd21fAe1eeDE06d7aa
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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 1486.32%

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
Binance
LINK-USDT$19.82
0.0061036 Eth
$109,579,290.00
5,504,598.310 LINK
24.0852%
2
Coinbase Exchange
LINK-USD$19.81
0.0060991 Eth
$40,590,282.00
2,049,289.740 LINK
8.9666%
3
Bitget
LINK-USDT$19.87
0.0061167 Eth
$26,898,940.00
1,352,891.992 LINK
5.9195%
4
P2B
LINK-USDT$19.85
0.0061128 Eth
$19,549,184.00
984,735.330 LINK
4.3087%
5
MEXC
LINK-USDT$19.84
0.0061135 Eth
$18,592,118.00
937,266.000 LINK
4.1010%
6
Slex
LINK-USDT$19.85
0.0061165 Eth
$17,957,571.00
901,618.590 LINK
3.9450%
7
OKX
LINK-USDT$19.86
0.0061160 Eth
$13,832,767.00
694,633.767 LINK
3.0393%
8
DigiFinex
LINK-USDT$19.89
0.0061225 Eth
$13,455,780.00
676,651.160 LINK
2.9607%
9
HTX
LINK-USDT$19.87
0.0061172 Eth
$11,645,365.00
583,855.967 LINK
2.5546%
10
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$19.84
0.0061091 Eth
$11,205,586.00
562,304.667 0X514910771AF9CA656AF840DFF83E8264ECF986CA
2.4603%
11
XT.COM
LINK-USDT$19.81
0.0061020 Eth
$10,967,830.00
550,788.570 LINK
2.4100%
12
Azbit
LINK-USDT$19.83
0.0061061 Eth
$10,782,463.00
541,856.357 LINK
2.3709%
13
Coinstore
LINK-USDT$19.86
0.0061136 Eth
$9,372,726.00
470,992.590 LINK
2.0608%
14
CoinW
LINK-USDT$19.89
0.0061224 Eth
$8,562,819.00
430,605.220 LINK
1.8841%
15
Bitunix
LINK-USDT$19.84
0.0061150 Eth
$8,156,789.00
411,200.140 LINK
1.7992%
16
Hotcoin
LINK-USDT$19.83
0.0061194 Eth
$7,096,299.00
357,900.210 LINK
1.5660%
17
Binance
LINK-FDUSD$19.85
0.0061076 Eth
$6,471,193.00
325,311.040 LINK
1.4234%
18
KuCoin
LINK-USDT$19.86
0.0061144 Eth
$6,371,945.00
320,814.287 LINK
1.4037%
19
BYDFi
LINK-USDT$19.90
0.0061190 Eth
$6,123,615.00
307,732.020 LINK
1.3465%
20
PancakeSwap (v2)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$19.83
0.0061063 Eth
$6,016,885.00
37,251.956 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.1630%
21
Binance
LINK-USDC$19.90
0.0061256 Eth
$5,560,966.00
279,072.390 LINK
1.2211%
22
LATOKEN
LINK-USDT$19.83
0.0061032 Eth
$5,411,726.00
272,972.157 LINK
1.1944%
23
LBank
LINK-USDT$19.81
0.0060999 Eth
$5,337,449.00
269,473.090 LINK
1.1791%
24
QMall
LINK-USDT$19.85
0.0061121 Eth
$4,314,319.00
216,773.047 LINK
0.9485%
25
BTSE
LINK-USDT$19.82
0.0061071 Eth
$4,149,679.00
209,334.582 LINK
0.9159%
26
Dex-Trade
LINK-USDT$19.84
0.0061100 Eth
$3,500,630.00
176,460.330 LINK
0.7721%
27
FMCPAY
LINK-USDT$19.87
0.0061087 Eth
$2,422,880.00
121,669.515 LINK
0.5324%
28
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$19.84
0.0061075 Eth
$2,379,904.00
119,655.604 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.5235%
29
Biconomy.com
LINK-USDT$19.82
0.0061032 Eth
$2,045,729.00
102,557.440 LINK
0.4487%
30
CoinEx
LINK-USDT$19.83
0.0061053 Eth
$1,911,303.00
95,716.219 LINK
0.4188%
31
PointPay
LINK-USDT$19.87
0.0061155 Eth
$1,712,775.00
86,064.537 LINK
0.3766%
32
EXMO
LINK-USDT$19.84
0.0061069 Eth
$1,599,289.00
80,620.715 LINK
0.3528%
33
Coinbase Exchange
LINK-EUR$19.82
0.0061028 Eth
$1,402,091.00
70,735.740 LINK
0.3095%
34
Bitvavo
LINK-EUR$19.89
0.0061299 Eth
$1,370,441.00
68,911.903 LINK
0.3015%
35
Coinbase Exchange
LINK-GBP$19.88
0.0061206 Eth
$1,276,198.00
64,196.620 LINK
0.2809%
36
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$19.85
0.0061143 Eth
$1,271,876.00
63,821.784 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.2793%
37
Phemex
LINK-USDT$19.83
0.0061143 Eth
$1,244,507.00
62,770.370 LINK
0.2746%
38
FMCPAY
LINK-ETH$19.82
0.0061072 Eth
$1,206,773.00
60,700.160 LINK
0.2656%
39
BigONE
LINK-USDT$19.86
0.0061191 Eth
$1,187,893.00
59,807.050 LINK
0.2617%
40
FMCPAY
LINK-BTC$19.81
0.0061058 Eth
$1,088,815.00
54,690.500 LINK
0.2393%
41
Bybit
LINK-USDC$19.86
0.0061151 Eth
$1,017,264.00
50,920.530 LINK
0.2228%
42
Trubit
LINK-USDT$19.85
0.0061039 Eth
$866,966.00
43,526.710 LINK
0.1904%
43
tanX
LINK-USDC$19.83
0.0061212 Eth
$863,423.00
43,250.400 LINK
0.1892%
44
BitStorage
LINK-USDT$19.90
0.0061187 Eth
$848,016.00
42,609.170 LINK
0.1864%
45
Gemini
LINK-USD$19.90
0.0061262 Eth
$842,865.00
42,359.398 LINK
0.1853%
46
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$19.84
0.0061100 Eth
$798,012.00
40,079.706 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.1754%
47
Azbit
LINK-ETH$19.90
0.0061167 Eth
$781,800.00
39,251.955 LINK
0.1717%
48
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$19.84
0.0061097 Eth
$766,673.00
38,760.851 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1696%
49
Bitbank
LINK-JPY$19.92
0.0061325 Eth
$743,293.00
37,321.182 LINK
0.1633%
50
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$19.90
0.0061289 Eth
$708,499.00
35,433.476 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.1550%
51
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$19.84
0.0061101 Eth
$701,684.00
704,520.558 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
3.0826%
52
EarnBIT
LINK-USDT$19.80
0.0060984 Eth
$634,614.00
31,899.144 LINK
0.1396%
53
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$19.80
0.0060971 Eth
$595,043.00
29,991.291 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1312%
54
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$19.79
0.0060918 Eth
$542,697.00
27,323.458 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1196%
55
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$19.82
0.0061024 Eth
$530,306.00
533,267.019 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
2.3333%
56
Binance
LINK-TRY$19.86
0.0061157 Eth
$512,241.00
25,704.480 LINK
0.1125%
57
OKX
LINK-USDC$19.83
0.0061059 Eth
$506,942.00
25,466.053 LINK
0.1114%
58
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$19.84
0.0061075 Eth
$505,598.00
38,618.646 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.1690%
59
Tokpie
LINK-USDT$19.87
0.0061085 Eth
$495,415.00
24,937.734 LINK
0.1091%
60
Binance
LINK-EUR$19.88
0.0061186 Eth
$488,754.00
24,539.830 LINK
0.1074%
61
QMall
LINK-USDC$19.86
0.0061128 Eth
$440,037.00
22,076.380 LINK
0.0966%
62
Coinbase Exchange
LINK-BTC$19.82
0.0061060 Eth
$435,756.00
21,986.280 LINK
0.0962%
63
itBit
LINK-USD$19.84
0.0061091 Eth
$425,518.00
21,447.474 LINK
0.0938%
64
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$19.83
0.0061061 Eth
$413,092.00
20,711.153 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0906%
65
GMO Japan
LINK-JPY$19.93
0.0061381 Eth
$399,913.00
20,066.900 LINK
0.0878%
66
Coinbase Exchange
LINK-ETH$19.82
0.0061060 Eth
$382,130.00
19,280.410 LINK
0.0844%
67
Coinbase Exchange
LINK-USDT$19.81
0.0061001 Eth
$332,213.00
16,767.128 LINK
0.0734%
68
Coins.ph
LINK-PHP$19.99
0.0061533 Eth
$323,139.00
16,230.404 LINK
0.0710%
69
BitDelta
LINK-USDT$19.89
0.0061149 Eth
$297,323.00
14,949.000 LINK
0.0654%
70
Hotcoin
LINK-BTC$19.83
0.0061053 Eth
$275,792.00
13,909.780 LINK
0.0609%
71
bitcastle
LINK-USDT$19.81
0.0060992 Eth
$212,363.00
10,667.810 LINK
0.0467%
72
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$19.81
0.0060978 Eth
$206,000.00
10,378.961 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0454%
73
Bitci TR
LINK-TRY$19.79
0.0060932 Eth
$199,273.00
9,982.970 LINK
0.0437%
74
LATOKEN
LINK-BTC$19.82
0.0061087 Eth
$194,820.00
9,828.897 LINK
0.0430%
75
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$19.82
0.0061024 Eth
$190,581.00
9,573.656 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0419%
76
DeGate
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$19.80
0.0060955 Eth
$176,144.00
8,869.198 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0388%
77
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$19.79
0.0060943 Eth
$164,749.00
8,317.612 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0364%
78
Mercado Bitcoin
LINK-BRL$19.85
0.0061104 Eth
$149,115.00
7,512.625 LINK
0.0329%
79
Binance US
LINK-USDT$19.82
0.0061056 Eth
$147,102.00
7,422.569 LINK
0.0325%
80
PointPay
LINK-BTC$19.85
0.0061098 Eth
$142,998.00
7,182.024 LINK
0.0314%
81
Bitkub
LINK-THB$19.91
0.0061300 Eth
$124,634.00
6,260.503 LINK
0.0274%
82
BitStorage
LINK-ETH$19.84
0.0061080 Eth
$117,166.00
5,905.360 LINK
0.0258%
83
KuCoin
LINK-USDC$19.90
0.0061256 Eth
$111,762.00
5,616.792 LINK
0.0246%
84
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$19.83
0.0061063 Eth
$110,931.00
5,617.765 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0246%
85
BitMart
LINK-ETH$19.83
0.0061062 Eth
$101,545.00
5,120.000 LINK
0.0224%
86
Kanga
LINK-PLN$19.98
0.0061508 Eth
$96,078.00
0.000 LINK
0.0000%
87
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$19.86
0.0061141 Eth
$95,557.00
95,760.682 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.4190%
88
Hotcoin
LINK-ETH$19.82
0.0061027 Eth
$93,740.00
4,729.860 LINK
0.0207%
89
Kraken
LINK-GBP$19.91
0.0061295 Eth
$86,734.00
4,356.534 LINK
0.0191%
90
Bitso
LINK-USD$19.85
0.0061114 Eth
$82,702.00
4,166.330 LINK
0.0182%
91
EXMO
LINK-BTC$19.88
0.0061209 Eth
$74,205.00
3,732.460 LINK
0.0163%
92
Uniswap V3 (Avalanche)
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$19.88
0.0061219 Eth
$66,011.00
3,413.669 0X5947BB275C521040051D82396192181B413227A3
0.0149%
93
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$19.90
0.0061287 Eth
$53,489.00
2,683.283 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0117%
94
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$19.83
0.0061066 Eth
$50,099.00
3,835.547 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.0168%
95
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$19.88
0.0061354 Eth
$45,889.00
2,403.545 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0105%
96
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$19.81
0.0060993 Eth
$35,873.00
1,804.786 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0079%
97
zondacrypto
LINK-PLN$20.05
0.0061742 Eth
$30,769.00
1,534.326 LINK
0.0067%
98
Bitexen
LINK-TRY$19.74
0.0060834 Eth
$29,334.00
1,485.892 LINK
0.0065%
99
Dex-Trade
LINK-ETH$19.92
0.0061221 Eth
$15,647.52
785.420 LINK
0.0034%
100
Ace
LINK-USDT$19.83
0.0061041 Eth
$4,482.70
225.170 LINK
0.0010%

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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