ETH Price: $2,722.23 (+1.15%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

735,013 ( 0.001%)

Market

Price

$19.49 @ 0.007160 ETH (+4.34%)

Onchain Market Cap

$19,490,000,000.00

Circulating Supply Market Cap

$12,450,221,992.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
0 LINK

Value
$0.00
0xc8a945b7e4e32336b710d7d93aa92d937614247a
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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 17618.18% |ETH 0.0003846 1761.67%

Market

Volume (24H):$567,974,958.00
Market Capitalization:$12,450,221,992.00
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
Binance
LINK-USDT$19.46
0.0071480 Eth
$63,691,603.00
3,304,289.310 LINK
18.7182%
2
MEXC
LINK-USDT$19.48
0.0071447 Eth
$35,821,506.00
1,838,704.140 LINK
10.4159%
3
Coinbase Exchange
LINK-USD$19.46
0.0071427 Eth
$34,798,790.00
1,788,589.100 LINK
10.1320%
4
Bybit
LINK-USDT$19.47
0.0071508 Eth
$26,399,462.00
1,370,915.356 LINK
7.7660%
5
HTX
LINK-USDT$19.47
0.0071501 Eth
$19,745,479.00
1,029,275.038 LINK
5.8306%
6
P2B
LINK-USDT$19.46
0.0071472 Eth
$12,965,166.00
666,279.730 LINK
3.7743%
7
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$19.54
0.0071756 Eth
$10,916,485.00
562,856.476 0X514910771AF9CA656AF840DFF83E8264ECF986CA
3.1885%
8
OKX
LINK-USDT$19.46
0.0071479 Eth
$9,472,305.00
491,451.753 LINK
2.7840%
9
Gate.io
LINK-USDT$19.46
0.0071468 Eth
$6,665,268.00
345,003.140 LINK
1.9544%
10
Binance
LINK-USDC$19.47
0.0071475 Eth
$6,507,335.00
337,208.630 LINK
1.9102%
11
XT.COM
LINK-USDT$19.46
0.0071464 Eth
$6,381,237.00
331,066.270 LINK
1.8754%
12
WhiteBIT
LINK-USDT$19.47
0.0071463 Eth
$5,674,694.00
291,444.750 LINK
1.6510%
13
Coinstore
LINK-USDT$19.51
0.0071505 Eth
$5,641,702.00
292,961.040 LINK
1.6596%
14
KuCoin
LINK-USDT$19.46
0.0071462 Eth
$5,632,503.00
289,444.209 LINK
1.6396%
15
BTSE
LINK-USDT$19.47
0.0071494 Eth
$5,064,103.00
260,064.450 LINK
1.4732%
16
CoinW
LINK-USDT$19.61
0.0071779 Eth
$5,057,986.00
257,985.790 LINK
1.4614%
17
Binance
LINK-FDUSD$19.46
0.0071381 Eth
$4,598,667.00
238,837.370 LINK
1.3530%
18
Hotcoin
LINK-USDT$19.48
0.0071531 Eth
$4,316,013.00
221,532.710 LINK
1.2549%
19
Kraken
LINK-USD$19.47
0.0071482 Eth
$3,935,189.00
202,166.397 LINK
1.1452%
20
Azbit
LINK-USDT$19.61
0.0071784 Eth
$3,734,602.00
193,666.557 LINK
1.0971%
21
BYDFi
LINK-USDT$19.44
0.0071387 Eth
$3,595,686.00
184,939.850 LINK
1.0476%
22
Crypto.com Exchange
LINK-USDT$19.49
0.0071552 Eth
$3,205,909.00
164,511.320 LINK
0.9319%
23
LATOKEN
LINK-USDT$19.45
0.0071414 Eth
$3,169,331.00
162,927.343 LINK
0.9230%
24
QMall
LINK-USDT$19.48
0.0071531 Eth
$2,575,182.00
133,607.781 LINK
0.7569%
25
Coinbase Exchange
LINK-EUR$19.50
0.0071606 Eth
$2,567,084.00
131,628.540 LINK
0.7457%
26
FMCPAY
LINK-USDT$19.45
0.0071434 Eth
$2,072,669.00
107,755.365 LINK
0.6104%
27
Dex-Trade
LINK-USDT$19.49
0.0071581 Eth
$2,060,845.00
105,726.530 LINK
0.5989%
28
MEXC
LINK-USDC$19.46
0.0071424 Eth
$1,945,765.00
99,989.680 LINK
0.5664%
29
Bitvavo
LINK-EUR$19.48
0.0071514 Eth
$1,935,293.00
99,329.359 LINK
0.5627%
30
CoinEx
LINK-USDT$19.47
0.0071470 Eth
$1,699,194.00
87,601.782 LINK
0.4962%
31
Coinbase Exchange
LINK-GBP$19.47
0.0071505 Eth
$1,663,721.00
85,428.720 LINK
0.4839%
32
Biconomy.com
LINK-USDT$19.48
0.0071516 Eth
$1,571,274.00
81,740.640 LINK
0.4630%
33
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$19.50
0.0071601 Eth
$1,471,629.00
76,400.781 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.4328%
34
FMCPAY
LINK-ETH$19.56
0.0071637 Eth
$1,266,286.00
65,766.400 LINK
0.3726%
35
FMCPAY
LINK-BTC$19.47
0.0071504 Eth
$1,080,586.00
55,982.000 LINK
0.3171%
36
PointPay
LINK-USDT$19.47
0.0071474 Eth
$1,004,916.00
52,125.217 LINK
0.2953%
37
tanX
LINK-USDC$19.48
0.0071528 Eth
$823,013.00
42,895.400 LINK
0.2430%
38
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$19.50
0.0071603 Eth
$774,372.00
40,388.252 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.2288%
39
Trubit
LINK-USDT$19.46
0.0071442 Eth
$751,395.00
39,160.140 LINK
0.2218%
40
EXMO
LINK-USDT$19.48
0.0071550 Eth
$726,899.00
37,312.452 LINK
0.2114%
41
Phemex
LINK-USDT$19.48
0.0071524 Eth
$682,715.00
35,042.610 LINK
0.1985%
42
LATOKEN
LINK-BTC$19.46
0.0071450 Eth
$652,113.00
33,510.274 LINK
0.1898%
43
Binance
LINK-EUR$19.51
0.0071637 Eth
$648,677.00
33,669.610 LINK
0.1907%
44
Gemini
LINK-USD$19.48
0.0071557 Eth
$643,695.00
33,040.050 LINK
0.1872%
45
WhiteBIT
LINK-BTC$19.47
0.0071463 Eth
$598,461.00
30,736.290 LINK
0.1741%
46
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$19.45
0.0071398 Eth
$583,096.00
30,230.745 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1713%
47
Bitbank
LINK-JPY$19.56
0.0071855 Eth
$579,462.00
29,619.785 LINK
0.1678%
48
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$19.46
0.0071445 Eth
$579,404.00
574,685.700 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
3.2555%
49
BigONE
LINK-USDT$19.43
0.0071302 Eth
$571,968.00
29,443.610 LINK
0.1668%
50
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$19.45
0.0071420 Eth
$563,485.00
29,159.207 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1652%
51
Binance
LINK-TRY$19.61
0.0071799 Eth
$543,835.00
28,308.340 LINK
0.1604%
52
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$19.54
0.0071760 Eth
$541,999.00
28,237.505 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1600%
53
QMall
LINK-USDC$19.57
0.0071669 Eth
$500,210.00
25,939.647 LINK
0.1469%
54
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$19.49
0.0071565 Eth
$489,608.00
25,218.620 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1429%
55
EarnBIT
LINK-USDT$19.48
0.0071514 Eth
$446,759.00
23,194.798 LINK
0.1314%
56
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$19.54
0.0071756 Eth
$406,621.00
39,809.428 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.2255%
57
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$19.49
0.0071545 Eth
$394,871.00
20,422.061 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1157%
58
Bybit
LINK-USDC$19.48
0.0071536 Eth
$391,467.00
20,324.052 LINK
0.1151%
59
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$19.40
0.0071248 Eth
$344,150.00
17,899.217 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.1014%
60
OKX
LINK-USDC$19.46
0.0071474 Eth
$266,454.00
13,791.758 LINK
0.0781%
61
BitMart
LINK-BTC$19.46
0.0071461 Eth
$266,294.00
13,682.100 LINK
0.0775%
62
BitDelta
LINK-USDT$19.46
0.0071461 Eth
$230,533.00
12,009.000 LINK
0.0680%
63
KuCoin
LINK-BTC$19.46
0.0071472 Eth
$225,134.00
11,567.583 LINK
0.0655%
64
Bitci TR
LINK-TRY$19.46
0.0071446 Eth
$196,589.00
10,275.140 LINK
0.0582%
65
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$19.54
0.0071756 Eth
$189,837.00
9,789.717 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0555%
66
GMO Japan
LINK-JPY$19.46
0.0071240 Eth
$185,590.00
9,537.700 LINK
0.0540%
67
CoinTR
LINK-TRY$19.50
0.0071633 Eth
$159,791.00
8,344.430 LINK
0.0473%
68
Hotcoin
LINK-BTC$19.54
0.0071572 Eth
$151,454.00
7,752.700 LINK
0.0439%
69
BYDFi
LINK-USDC$19.48
0.0071515 Eth
$141,352.00
7,254.440 LINK
0.0411%
70
Kraken
LINK-GBP$19.63
0.0072087 Eth
$139,192.00
7,090.808 LINK
0.0402%
71
DeGate
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$19.45
0.0071413 Eth
$137,888.00
7,161.289 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0406%
72
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$19.44
0.0071371 Eth
$128,819.00
6,676.865 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0378%
73
Coinbase Exchange
LINK-ETH$19.52
0.0071677 Eth
$114,955.00
5,889.040 LINK
0.0334%
74
BitStorage
LINK-ETH$19.47
0.0071492 Eth
$105,713.00
5,430.140 LINK
0.0308%
75
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$19.50
0.0071601 Eth
$101,065.00
99,682.368 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.5647%
76
Uniswap V4 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$19.55
0.0071790 Eth
$97,640.00
96,254.620 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.5453%
77
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$19.51
0.0071636 Eth
$97,002.00
5,031.725 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0285%
78
KuCoin
LINK-USDC$19.59
0.0071953 Eth
$91,660.00
4,678.127 LINK
0.0265%
79
Kanga
LINK-PLN$19.60
0.0071957 Eth
$85,415.00
0.000 LINK
0.0000%
80
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$19.38
0.0071146 Eth
$76,660.00
3,974.599 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0225%
81
Uniswap V4 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$19.55
0.0071790 Eth
$74,087.00
3,820.537 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0216%
82
BitMart
LINK-ETH$19.46
0.0071465 Eth
$69,406.00
3,565.880 LINK
0.0202%
83
Binance US
LINK-USDT$19.48
0.0071534 Eth
$57,892.00
2,971.512 LINK
0.0168%
84
Bitso
LINK-USD$19.50
0.0071514 Eth
$50,530.00
2,591.399 LINK
0.0147%
85
PancakeSwap (v2)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$19.44
0.0071385 Eth
$46,195.00
2,430.686 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0138%
86
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$19.50
0.0071600 Eth
$44,332.00
2,296.778 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0130%
87
Hotcoin
LINK-ETH$19.47
0.0071460 Eth
$42,933.00
2,205.150 LINK
0.0125%
88
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XDAC17F958D2EE523A2206206994597C13D831EC7$19.55
0.0071774 Eth
$38,697.00
2,006.704 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0114%
89
Crypto.com Exchange
LINK-BTC$19.54
0.0071738 Eth
$37,495.00
1,919.060 LINK
0.0109%
90
EXMO
LINK-BTC$19.50
0.0071598 Eth
$37,124.00
1,903.950 LINK
0.0108%
91
Uniswap V4 (Arbitrum)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$19.50
0.0071615 Eth
$33,862.00
1,751.216 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0099%
92
Indodax
LINK-IDR$19.59
0.0071960 Eth
$23,495.00
1,199.235 LINK
0.0068%
93
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$19.54
0.0071758 Eth
$23,168.00
1,193.951 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0068%
94
THENA FUSION
0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$19.45
0.0071416 Eth
$22,430.00
30.239 0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827
0.0002%
95
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$19.47
0.0071484 Eth
$16,580.10
16,417.958 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.0930%
96
Dex-Trade
LINK-ETH$19.51
0.0071506 Eth
$14,249.02
730.510 LINK
0.0041%
97
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$19.46
0.0071444 Eth
$13,954.58
724.553 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0041%
98
Bitexen
LINK-TRY$19.30
0.0070858 Eth
$12,212.60
632.819 LINK
0.0036%
99
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X55D398326F99059FF775485246999027B3197955$19.57
0.0071871 Eth
$12,105.84
628.182 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0036%
100
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X1BFD67037B42CF73ACF2047067BD4F2C47D9BFD6$19.54
0.0071747 Eth
$9,598.02
495.503 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0028%

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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