ETH Price: $2,617.07 (-1.23%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

733,131 ( 0.008%)

Market

Price

$18.24 @ 0.006970 ETH (-0.98%)

Onchain Market Cap

$18,240,000,000.00

Circulating Supply Market Cap

$11,655,088,974.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
145.898663171596974661 LINK

Value
$2,661.19 ( ~1.0169 Eth) [0.0000%]
0xA3222B8B56E003AE89757F55bf760d49f042dBAc
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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 16481.82% |ETH 0.0003846 1712.27%

Market

Volume (24H):$508,542,000.00
Market Capitalization:$11,655,088,974.00
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$18.35
0.0069548 Eth
$61,475,260.00
3,347,842.590 LINK
20.5898%
2
Coinbase Exchange
LINK-USD$18.17
0.0069458 Eth
$29,072,822.00
1,600,485.660 LINK
9.8433%
3
Bybit
LINK-USDT$18.16
0.0069449 Eth
$26,630,312.00
1,452,381.047 LINK
8.9324%
4
HTX
LINK-USDT$18.14
0.0069322 Eth
$15,739,446.00
850,134.825 LINK
5.2285%
5
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$18.16
0.0069437 Eth
$13,879,847.00
758,885.057 0X514910771AF9CA656AF840DFF83E8264ECF986CA
4.6673%
6
P2B
LINK-USDT$18.15
0.0069196 Eth
$12,152,071.00
669,466.180 LINK
4.1173%
7
Gate.io
LINK-USDT$18.13
0.0069312 Eth
$9,935,743.00
541,827.280 LINK
3.3323%
8
OKX
LINK-USDT$18.13
0.0069307 Eth
$9,790,272.00
530,364.465 LINK
3.2618%
9
MEXC
LINK-USDT$18.19
0.0069445 Eth
$8,268,775.00
454,485.330 LINK
2.7952%
10
DigiFinex
LINK-USDT$18.13
0.0069317 Eth
$7,851,497.00
433,112.240 LINK
2.6637%
11
XT.COM
LINK-USDT$18.13
0.0069245 Eth
$6,161,061.00
335,510.110 LINK
2.0634%
12
Coinstore
LINK-USDT$18.16
0.0069414 Eth
$5,384,164.00
292,851.840 LINK
1.8011%
13
KuCoin
LINK-USDT$18.13
0.0069314 Eth
$5,171,615.00
285,225.168 LINK
1.7542%
14
Binance
LINK-USDC$18.18
0.0069224 Eth
$4,908,379.00
269,366.470 LINK
1.6567%
15
BTSE
LINK-USDT$18.14
0.0069315 Eth
$4,874,945.00
268,806.180 LINK
1.6532%
16
Bitunix
LINK-USDT$18.16
0.0069359 Eth
$4,528,215.00
249,474.600 LINK
1.5343%
17
CoinW
LINK-USDT$18.18
0.0069357 Eth
$4,363,806.00
240,078.560 LINK
1.4765%
18
Binance
LINK-FDUSD$18.07
0.0069102 Eth
$4,261,547.00
232,542.530 LINK
1.4302%
19
Kraken
LINK-USD$18.14
0.0069352 Eth
$3,986,352.00
219,735.906 LINK
1.3514%
20
Hotcoin
LINK-USDT$18.17
0.0069488 Eth
$3,624,813.00
199,463.720 LINK
1.2267%
21
BYDFi
LINK-USDT$18.28
0.0069326 Eth
$3,413,423.00
186,737.820 LINK
1.1485%
22
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$18.17
0.0069415 Eth
$2,718,209.00
148,791.384 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.9151%
23
LATOKEN
LINK-USDT$18.36
0.0069587 Eth
$2,517,342.00
137,107.184 LINK
0.8432%
24
QMall
LINK-USDT$18.18
0.0069436 Eth
$2,509,966.00
136,765.671 LINK
0.8411%
25
Bitvavo
LINK-EUR$18.24
0.0069544 Eth
$2,492,765.00
136,640.932 LINK
0.8404%
26
Coinbase Exchange
LINK-EUR$18.20
0.0069485 Eth
$2,427,097.00
133,327.770 LINK
0.8200%
27
FMCPAY
LINK-USDT$18.13
0.0069245 Eth
$2,121,799.00
115,017.704 LINK
0.7074%
28
Dex-Trade
LINK-USDT$18.15
0.0069353 Eth
$2,001,483.00
110,302.360 LINK
0.6784%
29
WhiteBIT
LINK-USDT$18.28
0.0069876 Eth
$1,790,429.00
97,931.660 LINK
0.6023%
30
Biconomy.com
LINK-USDT$18.15
0.0069322 Eth
$1,654,928.00
89,490.570 LINK
0.5504%
31
FMCPAY
LINK-ETH$18.16
0.0069336 Eth
$1,228,251.00
67,007.200 LINK
0.4121%
32
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$18.16
0.0069440 Eth
$1,224,551.00
67,101.268 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.4127%
33
Coinbase Exchange
LINK-GBP$18.17
0.0069380 Eth
$1,172,550.00
64,532.410 LINK
0.3969%
34
CoinEx
LINK-USDT$18.15
0.0069304 Eth
$1,168,607.00
63,512.843 LINK
0.3906%
35
FMCPAY
LINK-BTC$18.19
0.0069382 Eth
$1,086,564.00
58,889.200 LINK
0.3622%
36
PointPay
LINK-USDT$18.18
0.0069380 Eth
$953,904.00
51,980.779 LINK
0.3197%
37
Trubit
LINK-USDT$18.14
0.0069282 Eth
$932,739.00
50,323.060 LINK
0.3095%
38
Bitbank
LINK-JPY$18.26
0.0069747 Eth
$729,749.00
39,969.730 LINK
0.2458%
39
Binance
LINK-ETH$18.33
0.0069521 Eth
$724,767.00
39,453.560 LINK
0.2426%
40
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$18.15
0.0069315 Eth
$686,587.00
37,497.926 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.2306%
41
EXMO
LINK-USDT$18.15
0.0069342 Eth
$667,376.00
36,766.970 LINK
0.2261%
42
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$18.18
0.0069411 Eth
$665,435.00
36,377.313 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.2237%
43
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$18.19
0.0069471 Eth
$662,357.00
36,350.270 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.2236%
44
Phemex
LINK-USDT$18.20
0.0069452 Eth
$638,738.00
35,104.930 LINK
0.2159%
45
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$18.22
0.0069576 Eth
$564,508.00
31,110.484 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1913%
46
Binance
LINK-TRY$18.23
0.0069718 Eth
$515,914.00
27,927.360 LINK
0.1718%
47
BitStorage
LINK-USDT$18.17
0.0069416 Eth
$497,728.00
27,391.320 LINK
0.1685%
48
BigONE
LINK-USDT$18.27
0.0069329 Eth
$485,903.00
26,602.160 LINK
0.1636%
49
EarnBIT
LINK-USDT$18.14
0.0069336 Eth
$467,137.00
25,333.899 LINK
0.1558%
50
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$18.16
0.0069437 Eth
$401,459.00
44,721.668 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.2750%
51
QMall
LINK-USDC$18.19
0.0069445 Eth
$401,215.00
21,926.567 LINK
0.1349%
52
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$18.20
0.0069490 Eth
$398,872.00
21,795.089 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1340%
53
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$18.18
0.0069411 Eth
$376,985.00
381,883.081 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
2.3486%
54
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$18.17
0.0069405 Eth
$337,743.00
18,706.512 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.1150%
55
Slex
LINK-ETH$18.14
0.0069380 Eth
$316,638.00
17,271.820 LINK
0.1062%
56
WhiteBIT
LINK-TRY$18.26
0.0069692 Eth
$315,416.00
17,275.350 LINK
0.1062%
57
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$18.17
0.0069425 Eth
$313,409.00
17,137.757 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1054%
58
Bybit
LINK-USDC$18.19
0.0069548 Eth
$304,934.00
16,717.952 LINK
0.1028%
59
Coinbase Exchange
LINK-ETH$18.20
0.0069595 Eth
$267,044.00
14,672.110 LINK
0.0902%
60
Bitkub
LINK-THB$18.56
0.0070218 Eth
$262,805.00
14,156.986 LINK
0.0871%
61
BitMart
LINK-BTC$18.33
0.0069601 Eth
$256,838.00
14,012.040 LINK
0.0862%
62
Gemini
LINK-USD$18.16
0.0069440 Eth
$238,589.00
13,137.964 LINK
0.0808%
63
Coinbase Exchange
LINK-BTC$18.16
0.0069357 Eth
$223,693.00
12,315.220 LINK
0.0757%
64
BitDelta
LINK-USDT$18.39
0.0069612 Eth
$220,794.00
11,981.000 LINK
0.0737%
65
Bitci TR
LINK-TRY$18.34
0.0070038 Eth
$187,938.00
10,082.800 LINK
0.0620%
66
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$18.16
0.0069427 Eth
$178,458.00
9,769.462 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0601%
67
LATOKEN
LINK-BTC$18.22
0.0069653 Eth
$176,595.00
9,694.476 LINK
0.0596%
68
Bitso
LINK-USD$18.27
0.0069786 Eth
$169,699.00
9,289.444 LINK
0.0571%
69
GMO Japan
LINK-JPY$18.55
0.0070860 Eth
$166,328.00
8,967.000 LINK
0.0551%
70
BitStorage
LINK-ETH$18.19
0.0069428 Eth
$163,719.00
9,002.950 LINK
0.0554%
71
WhiteBIT
LINK-EUR$18.20
0.0069546 Eth
$156,959.00
8,625.970 LINK
0.0531%
72
OKX
LINK-USDC$18.13
0.0069292 Eth
$150,944.00
8,240.264 LINK
0.0507%
73
DeGate
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$18.13
0.0069123 Eth
$135,844.00
7,401.733 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0455%
74
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$18.16
0.0069419 Eth
$130,309.00
7,165.769 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0441%
75
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$18.19
0.0069492 Eth
$125,941.00
6,891.516 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0424%
76
Hotcoin
LINK-BTC$18.20
0.0069398 Eth
$120,880.00
6,639.980 LINK
0.0408%
77
Kraken
LINK-GBP$18.39
0.0070313 Eth
$111,214.00
6,046.564 LINK
0.0372%
78
BYDFi
LINK-USDC$18.46
0.0069877 Eth
$110,849.00
6,006.220 LINK
0.0369%
79
WhiteBIT
LINK-BTC$18.30
0.0069830 Eth
$103,397.00
5,648.620 LINK
0.0347%
80
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$18.17
0.0069415 Eth
$95,379.00
95,471.784 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.5872%
81
PointPay
LINK-BTC$18.18
0.0069387 Eth
$90,329.00
4,918.723 LINK
0.0303%
82
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XDAC17F958D2EE523A2206206994597C13D831EC7$18.15
0.0069417 Eth
$82,630.00
4,523.252 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0278%
83
PancakeSwap (v2)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$18.28
0.0069805 Eth
$80,603.00
4,403.641 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0271%
84
KuCoin
LINK-USDC$18.13
0.0069290 Eth
$80,172.00
4,423.173 LINK
0.0272%
85
KuCoin
LINK-BTC$18.15
0.0069395 Eth
$60,647.00
3,340.896 LINK
0.0205%
86
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$18.21
0.0069548 Eth
$55,673.00
3,042.024 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0187%
87
EXMO
LINK-BTC$18.23
0.0069708 Eth
$47,101.00
2,583.073 LINK
0.0159%
88
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$18.19
0.0069466 Eth
$46,270.00
2,544.235 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0156%
89
Uniswap V3 (Avalanche)
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$18.17
0.0069397 Eth
$41,130.00
2,280.257 0X5947BB275C521040051D82396192181B413227A3
0.0140%
90
Bitexen
LINK-TRY$18.37
0.0069643 Eth
$33,488.00
1,823.003 LINK
0.0112%
91
Hotcoin
LINK-ETH$18.16
0.0069433 Eth
$32,127.00
1,768.830 LINK
0.0109%
92
Dex-Trade
LINK-ETH$18.18
0.0069470 Eth
$22,683.00
1,247.950 LINK
0.0077%
93
THENA FUSION
0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$18.22
0.0069556 Eth
$21,318.00
32.007 0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827
0.0002%
94
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFA7F8980B0F1E64A2062791CC3B0871572F1F7F0$18.22
0.0069587 Eth
$18,976.65
1,038.739 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0064%
95
Mercado Bitcoin
LINK-BRL$18.26
0.0069795 Eth
$18,422.75
1,009.045 LINK
0.0062%
96
CoinEx
LINK-USDC$18.22
0.0069581 Eth
$18,071.98
991.926 LINK
0.0061%
97
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$18.24
0.0069623 Eth
$17,730.81
17,845.409 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.1098%
98
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$18.26
0.0069750 Eth
$16,846.15
917.931 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0056%
99
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X1BFD67037B42CF73ACF2047067BD4F2C47D9BFD6$18.23
0.0069604 Eth
$16,100.30
876.798 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0054%
100
Uniswap V3 (Arbitrum One)
0XBA5DDD1F9D7F570DC94A51479A000E3BCE967196-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$18.19
0.0069494 Eth
$13,326.10
55.567 0XBA5DDD1F9D7F570DC94A51479A000E3BCE967196
0.0003%

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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