ETH Price: $3,352.68 (+0.54%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

728,170 ( 0.044%)

Market

Price

$22.65 @ 0.006756 ETH (-0.28%)

Onchain Market Cap

$22,650,000,000.00

Circulating Supply Market Cap

$14,300,281,694.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
30.953829299201767199 LINK

Value
$701.10 ( ~0.209116050111617 Eth) [0.0000%]
0x8cc32f993df952bcf42dd0484ed24e0b1d9ecfeb
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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 20490.91% |ETH 0.0003846 1656.63%

Market

Volume (24H):$942,962,368.00
Market Capitalization:$14,300,281,694.00
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$22.62
0.0067680 Eth
$96,276,545.00
4,214,816.640 LINK
18.3079%
2
WhiteBIT
LINK-USDT$22.59
0.0067431 Eth
$38,478,041.00
1,703,523.870 LINK
7.3996%
3
Coinbase Exchange
LINK-USD$22.57
0.0067265 Eth
$38,284,555.00
1,695,957.950 LINK
7.3667%
4
Bitget
LINK-USDT$22.57
0.0067281 Eth
$25,932,563.00
1,134,148.477 LINK
4.9264%
5
MEXC
LINK-USDT$22.57
0.0067481 Eth
$24,308,149.00
1,077,054.490 LINK
4.6784%
6
Slex
LINK-USDT$22.60
0.0067421 Eth
$22,643,014.00
991,249.310 LINK
4.3057%
7
Bybit
LINK-USDT$22.58
0.0067330 Eth
$21,244,423.00
929,708.272 LINK
4.0384%
8
P2B
LINK-USDT$22.63
0.0067641 Eth
$19,211,623.00
849,049.270 LINK
3.6880%
9
OKX
LINK-USDT$22.57
0.0067289 Eth
$19,129,543.00
837,423.762 LINK
3.6375%
10
CoinW
LINK-USDT$22.57
0.0067260 Eth
$16,452,907.00
728,898.950 LINK
3.1661%
11
Gate.io
LINK-USDT$22.55
0.0067233 Eth
$15,739,910.00
687,717.920 LINK
2.9872%
12
DigiFinex
LINK-USDT$22.58
0.0067334 Eth
$12,739,611.00
564,075.970 LINK
2.4502%
13
HTX
LINK-USDT$22.58
0.0067302 Eth
$11,234,248.00
492,210.080 LINK
2.1380%
14
XT.COM
LINK-USDT$22.59
0.0067342 Eth
$9,639,962.00
421,951.340 LINK
1.8328%
15
Azbit
LINK-USDT$22.63
0.0067461 Eth
$9,567,197.00
418,782.397 LINK
1.8191%
16
Coinstore
LINK-USDT$22.58
0.0067318 Eth
$8,478,007.00
371,416.730 LINK
1.6133%
17
Bitunix
LINK-USDT$22.61
0.0067358 Eth
$7,826,813.00
345,943.730 LINK
1.5027%
18
BTSE
LINK-USDT$22.56
0.0067259 Eth
$7,029,788.00
311,641.274 LINK
1.3537%
19
Biconomy.com
LINK-USDT$22.65
0.0067713 Eth
$6,647,198.00
290,906.820 LINK
1.2636%
20
BYDFi
LINK-USDT$22.70
0.0067803 Eth
$6,141,326.00
270,599.680 LINK
1.1754%
21
Hotcoin
LINK-USDT$22.56
0.0067251 Eth
$6,082,703.00
269,658.790 LINK
1.1713%
22
Binance
LINK-FDUSD$22.62
0.0067398 Eth
$5,846,173.00
255,429.960 LINK
1.1095%
23
LATOKEN
LINK-USDT$22.59
0.0067351 Eth
$4,653,118.00
205,987.121 LINK
0.8947%
24
LBank
LINK-USDT$22.61
0.0067414 Eth
$4,429,212.00
195,932.880 LINK
0.8511%
25
Kraken
LINK-USD$22.56
0.0067258 Eth
$4,026,855.00
178,518.284 LINK
0.7754%
26
QMall
LINK-USDT$22.61
0.0067399 Eth
$3,898,774.00
170,664.803 LINK
0.7413%
27
KuCoin
LINK-USDT$22.60
0.0067374 Eth
$3,709,602.00
164,170.566 LINK
0.7131%
28
Dex-Trade
LINK-USDT$22.59
0.0067346 Eth
$3,114,783.00
137,905.509 LINK
0.5990%
29
FMCPAY
LINK-USDT$22.61
0.0067373 Eth
$3,094,955.00
135,639.343 LINK
0.5892%
30
Bitvavo
LINK-EUR$22.61
0.0067362 Eth
$2,504,405.00
110,782.706 LINK
0.4812%
31
Dcoin
LINK-USDT$22.67
0.0067760 Eth
$2,404,952.00
106,075.000 LINK
0.4608%
32
Coinbase Exchange
LINK-GBP$22.61
0.0067345 Eth
$2,248,734.00
99,452.770 LINK
0.4320%
33
PointPay
LINK-USDT$22.58
0.0067311 Eth
$1,570,387.00
68,730.585 LINK
0.2985%
34
EXMO
LINK-USDT$22.58
0.0067330 Eth
$1,531,832.00
67,826.239 LINK
0.2946%
35
FMCPAY
LINK-ETH$22.59
0.0067290 Eth
$1,459,113.00
63,902.560 LINK
0.2776%
36
FMCPAY
LINK-BTC$22.60
0.0067329 Eth
$1,400,327.00
62,129.700 LINK
0.2699%
37
WhiteBIT
LINK-BTC$22.63
0.0067630 Eth
$1,332,379.00
58,871.940 LINK
0.2557%
38
WhiteBIT
LINK-TRY$22.76
0.0068013 Eth
$1,314,631.00
57,764.830 LINK
0.2509%
39
CoinEx
LINK-USDT$22.61
0.0067473 Eth
$1,268,430.00
55,667.598 LINK
0.2418%
40
Bybit
LINK-USDC$22.58
0.0067314 Eth
$1,208,261.00
52,916.719 LINK
0.2299%
41
Coinbase Exchange
LINK-USDT$22.56
0.0067225 Eth
$1,156,100.00
51,244.531 LINK
0.2226%
42
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$22.60
0.0067375 Eth
$1,077,231.00
79,890.743 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.3470%
43
Phemex
LINK-USDT$22.59
0.0067294 Eth
$1,024,573.00
45,345.870 LINK
0.1970%
44
BigONE
LINK-USDT$22.63
0.0067408 Eth
$961,423.00
42,479.220 LINK
0.1845%
45
tanX
LINK-USDC$22.61
0.0067425 Eth
$951,188.00
41,610.620 LINK
0.1807%
46
Bitbank
LINK-JPY$22.67
0.0067575 Eth
$931,825.00
41,111.277 LINK
0.1786%
47
EarnBIT
LINK-USDT$22.59
0.0067452 Eth
$920,692.00
40,246.325 LINK
0.1748%
48
Coinbase Exchange
LINK-EUR$22.62
0.0067378 Eth
$882,126.00
38,993.980 LINK
0.1694%
49
BitStorage
LINK-USDT$22.67
0.0067742 Eth
$757,713.00
33,427.820 LINK
0.1452%
50
Gemini
LINK-USD$22.61
0.0067395 Eth
$748,812.00
33,125.425 LINK
0.1439%
51
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$22.59
0.0067297 Eth
$740,989.00
32,492.962 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1411%
52
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$22.58
0.0067331 Eth
$734,607.00
745,211.543 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
3.2370%
53
itBit
LINK-USD$22.62
0.0067371 Eth
$576,746.00
25,497.170 LINK
0.1108%
54
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$22.54
0.0067158 Eth
$564,760.00
24,772.791 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.1076%
55
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$22.61
0.0067351 Eth
$539,914.00
23,506.263 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1021%
56
Binance
LINK-EUR$22.61
0.0067378 Eth
$518,367.00
22,693.780 LINK
0.0986%
57
Binance
LINK-TRY$22.69
0.0067627 Eth
$515,485.00
22,419.720 LINK
0.0974%
58
Koinpark
LINK-USDT$22.57
0.0067281 Eth
$489,447.00
21,688.663 LINK
0.0942%
59
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$22.74
0.0067801 Eth
$469,676.00
20,582.274 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0894%
60
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$22.56
0.0067258 Eth
$453,439.00
19,920.506 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0865%
61
WhiteBIT
LINK-EUR$22.59
0.0067465 Eth
$440,250.00
19,487.000 LINK
0.0846%
62
HashKey Exchange
LINK-USD$22.63
0.0067398 Eth
$422,391.00
18,362.339 LINK
0.0798%
63
GMO Japan
LINK-JPY$22.62
0.0067398 Eth
$416,940.00
18,433.700 LINK
0.0801%
64
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$22.80
0.0067917 Eth
$389,483.00
16,984.088 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0738%
65
Slex
LINK-ETH$22.58
0.0067317 Eth
$388,690.00
17,031.410 LINK
0.0740%
66
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$22.58
0.0067267 Eth
$384,748.00
389,177.597 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
1.6905%
67
BitMart
LINK-BTC$22.57
0.0067289 Eth
$330,539.00
14,645.120 LINK
0.0636%
68
QMall
LINK-USDC$22.61
0.0067330 Eth
$291,603.00
12,750.095 LINK
0.0554%
69
BitDelta
LINK-USDT$22.59
0.0067294 Eth
$274,963.00
12,054.000 LINK
0.0524%
70
OKX
LINK-USDC$22.58
0.0067328 Eth
$253,808.00
11,115.116 LINK
0.0483%
71
Bitci TR
LINK-TRY$22.81
0.0067924 Eth
$233,129.00
10,162.760 LINK
0.0441%
72
Hotcoin
LINK-BTC$22.57
0.0067277 Eth
$209,596.00
9,288.230 LINK
0.0403%
73
DeGate
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$22.64
0.0067478 Eth
$192,870.00
8,418.263 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0366%
74
Coinbase Exchange
LINK-BTC$22.61
0.0067343 Eth
$191,914.00
8,487.900 LINK
0.0369%
75
LATOKEN
LINK-BTC$22.59
0.0067367 Eth
$175,180.00
7,753.560 LINK
0.0337%
76
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$22.58
0.0067314 Eth
$170,384.00
7,502.179 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0326%
77
Bitbegin
LINK-USDT$22.59
0.0067453 Eth
$161,358.00
7,146.775 LINK
0.0310%
78
BitStorage
LINK-ETH$22.63
0.0067407 Eth
$146,067.00
6,455.680 LINK
0.0280%
79
BitMart
LINK-ETH$22.57
0.0067299 Eth
$128,050.00
5,672.600 LINK
0.0246%
80
PointPay
LINK-BTC$22.57
0.0067274 Eth
$124,117.00
5,501.407 LINK
0.0239%
81
Bitso
LINK-USD$22.64
0.0067436 Eth
$108,526.00
4,794.421 LINK
0.0208%
82
Bitkub
LINK-THB$22.78
0.0067924 Eth
$106,491.00
4,674.174 LINK
0.0203%
83
KuCoin
LINK-USDC$22.56
0.0067282 Eth
$103,148.00
4,571.162 LINK
0.0199%
84
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$22.62
0.0067374 Eth
$102,919.00
4,511.332 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0196%
85
Binance US
LINK-USDT$22.62
0.0067379 Eth
$101,812.00
4,500.341 LINK
0.0195%
86
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$22.71
0.0067639 Eth
$101,046.00
4,418.526 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0192%
87
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$22.66
0.0067495 Eth
$91,939.00
93,193.406 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.4048%
88
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$22.60
0.0067375 Eth
$81,989.00
6,135.605 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.0267%
89
Hotcoin
LINK-ETH$22.58
0.0067314 Eth
$74,609.00
3,303.970 LINK
0.0144%
90
KuCoin
LINK-BTC$22.57
0.0067302 Eth
$74,366.00
3,294.652 LINK
0.0143%
91
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$22.60
0.0067372 Eth
$68,353.00
2,991.527 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0130%
92
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$22.57
0.0067237 Eth
$68,171.00
2,988.428 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0130%
93
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$22.67
0.0067520 Eth
$58,922.00
2,587.669 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0112%
94
PancakeSwap (v2)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$22.55
0.0067235 Eth
$57,599.00
2,528.399 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0110%
95
Mercado Bitcoin
LINK-BRL$22.61
0.0067411 Eth
$53,189.00
2,352.361 LINK
0.0102%
96
Nonkyc.io
LINK-BTC$22.65
0.0067524 Eth
$43,858.00
1,946.874 LINK
0.0085%
97
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$22.82
0.0067966 Eth
$42,997.00
1,898.774 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0082%
98
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XDAC17F958D2EE523A2206206994597C13D831EC7$22.62
0.0067452 Eth
$36,002.00
1,574.777 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0068%
99
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X1BFD67037B42CF73ACF2047067BD4F2C47D9BFD6$22.70
0.0067665 Eth
$23,549.00
1,036.660 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0045%
100
Bitexen
LINK-TRY$22.50
0.0067140 Eth
$16,941.62
753.126 LINK
0.0033%

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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