ETH Price: $2,727.79 (+1.36%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

735,019 ( 0.001%)

Market

Price

$19.44 @ 0.007127 ETH (+3.72%)

Onchain Market Cap

$19,440,000,000.00

Circulating Supply Market Cap

$12,409,162,744.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
130.83237747 LINK

Value
$2,543.38 ( ~0.932395596674079 Eth) [0.0000%]
0x07f2fb376f1909979824fa19882d37af015d508d
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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 17572.73% |ETH 0.0003846 1753.09%

Market

Volume (24H):$567,590,063.00
Market Capitalization:$12,409,162,744.00
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$19.44
0.0071429 Eth
$63,683,153.00
3,303,546.320 LINK
18.9371%
2
MEXC
LINK-USDT$19.48
0.0071447 Eth
$35,821,506.00
1,838,704.140 LINK
10.5401%
3
Coinbase Exchange
LINK-USD$19.45
0.0071449 Eth
$34,886,277.00
1,793,362.300 LINK
10.2802%
4
Bybit
LINK-USDT$19.45
0.0071435 Eth
$26,379,094.00
1,369,711.821 LINK
7.8517%
5
HTX
LINK-USDT$19.45
0.0071432 Eth
$19,737,243.00
1,028,413.188 LINK
5.8952%
6
P2B
LINK-USDT$19.44
0.0071435 Eth
$12,960,270.00
666,561.670 LINK
3.8210%
7
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$19.41
0.0071305 Eth
$10,851,369.00
563,280.180 0X514910771AF9CA656AF840DFF83E8264ECF986CA
3.2289%
8
OKX
LINK-USDT$19.47
0.0071514 Eth
$9,471,133.00
491,260.368 LINK
2.8161%
9
DigiFinex
LINK-USDT$19.48
0.0071534 Eth
$8,209,633.00
421,492.310 LINK
2.4161%
10
Gate.io
LINK-USDT$19.45
0.0071444 Eth
$6,647,408.00
344,040.160 LINK
1.9722%
11
XT.COM
LINK-USDT$19.45
0.0071457 Eth
$6,380,837.00
331,012.580 LINK
1.8975%
12
KuCoin
LINK-USDT$19.45
0.0071449 Eth
$5,770,691.00
296,637.822 LINK
1.7004%
13
WhiteBIT
LINK-USDT$19.44
0.0071423 Eth
$5,702,687.00
293,326.730 LINK
1.6814%
14
Coinstore
LINK-USDT$19.51
0.0071505 Eth
$5,641,702.00
292,961.040 LINK
1.6794%
15
BTSE
LINK-USDT$19.44
0.0071416 Eth
$5,084,439.00
261,530.600 LINK
1.4992%
16
CoinW
LINK-USDT$19.44
0.0071411 Eth
$5,029,263.00
258,724.570 LINK
1.4831%
17
Binance
LINK-FDUSD$19.46
0.0071464 Eth
$4,600,953.00
238,615.090 LINK
1.3678%
18
Hotcoin
LINK-USDT$19.44
0.0071416 Eth
$4,313,416.00
221,857.330 LINK
1.2718%
19
Kraken
LINK-USD$19.47
0.0071495 Eth
$3,934,449.00
202,118.311 LINK
1.1586%
20
Azbit
LINK-USDT$19.44
0.0071448 Eth
$3,738,807.00
193,987.654 LINK
1.1120%
21
BYDFi
LINK-USDT$19.44
0.0071387 Eth
$3,595,686.00
184,939.850 LINK
1.0601%
22
LATOKEN
LINK-USDT$19.44
0.0071423 Eth
$3,168,634.00
162,971.433 LINK
0.9342%
23
QMall
LINK-USDT$19.44
0.0071415 Eth
$2,581,950.00
133,952.846 LINK
0.7679%
24
Coinbase Exchange
LINK-EUR$19.45
0.0071465 Eth
$2,565,964.00
131,926.150 LINK
0.7562%
25
FMCPAY
LINK-USDT$19.44
0.0071429 Eth
$2,072,551.00
107,730.765 LINK
0.6175%
26
Dex-Trade
LINK-USDT$19.44
0.0071416 Eth
$2,055,945.00
105,756.080 LINK
0.6062%
27
Bitvavo
LINK-EUR$19.48
0.0071514 Eth
$1,935,293.00
99,329.359 LINK
0.5694%
28
CoinEx
LINK-USDT$19.44
0.0071414 Eth
$1,699,289.00
87,607.092 LINK
0.5022%
29
Coinbase Exchange
LINK-GBP$19.45
0.0071464 Eth
$1,678,833.00
86,316.390 LINK
0.4948%
30
Biconomy.com
LINK-USDT$19.44
0.0071411 Eth
$1,571,597.00
81,734.750 LINK
0.4685%
31
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$19.49
0.0071605 Eth
$1,470,588.00
76,373.151 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.4378%
32
FMCPAY
LINK-ETH$19.41
0.0071295 Eth
$1,262,484.00
65,691.680 LINK
0.3766%
33
FMCPAY
LINK-BTC$19.44
0.0071415 Eth
$1,074,454.00
55,692.300 LINK
0.3192%
34
PointPay
LINK-USDT$19.43
0.0071411 Eth
$1,007,155.00
52,238.774 LINK
0.2995%
35
tanX
LINK-USDC$19.43
0.0071365 Eth
$819,150.00
42,699.090 LINK
0.2448%
36
Trubit
LINK-USDT$19.45
0.0071439 Eth
$751,944.00
39,182.640 LINK
0.2246%
37
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$19.48
0.0071562 Eth
$746,010.00
38,928.275 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.2232%
38
EXMO
LINK-USDT$19.45
0.0071454 Eth
$725,674.00
37,301.587 LINK
0.2138%
39
Phemex
LINK-USDT$19.44
0.0071423 Eth
$681,152.00
35,033.520 LINK
0.2008%
40
LATOKEN
LINK-BTC$19.44
0.0071419 Eth
$649,505.00
33,404.255 LINK
0.1915%
41
Binance
LINK-EUR$19.51
0.0071637 Eth
$648,677.00
33,669.610 LINK
0.1930%
42
Gemini
LINK-USD$19.45
0.0071447 Eth
$640,010.00
32,900.985 LINK
0.1886%
43
WhiteBIT
LINK-BTC$19.42
0.0071336 Eth
$598,865.00
30,841.250 LINK
0.1768%
44
Bitbank
LINK-JPY$19.51
0.0071644 Eth
$578,454.00
29,653.824 LINK
0.1700%
45
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$19.44
0.0071424 Eth
$578,443.00
574,291.998 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
3.2920%
46
BigONE
LINK-USDT$19.43
0.0071386 Eth
$572,773.00
29,478.390 LINK
0.1690%
47
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$19.44
0.0071424 Eth
$563,186.00
29,159.207 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1672%
48
Binance
LINK-TRY$19.52
0.0071719 Eth
$543,778.00
28,297.700 LINK
0.1622%
49
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$19.42
0.0071339 Eth
$537,100.00
28,002.313 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1605%
50
QMall
LINK-USDC$19.44
0.0071408 Eth
$502,826.00
26,073.554 LINK
0.1495%
51
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$19.46
0.0071477 Eth
$487,880.00
25,159.783 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1442%
52
EarnBIT
LINK-USDT$19.44
0.0071407 Eth
$448,321.00
23,269.477 LINK
0.1334%
53
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$19.41
0.0071305 Eth
$403,842.00
39,807.331 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.2282%
54
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$19.43
0.0071393 Eth
$393,708.00
20,379.148 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1168%
55
Bybit
LINK-USDC$19.48
0.0071549 Eth
$391,478.00
20,324.052 LINK
0.1165%
56
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$19.42
0.0071316 Eth
$341,965.00
17,763.246 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.1018%
57
BitMart
LINK-BTC$19.44
0.0071412 Eth
$266,065.00
13,686.520 LINK
0.0785%
58
OKX
LINK-USDC$19.43
0.0071374 Eth
$266,011.00
13,768.569 LINK
0.0789%
59
BitDelta
LINK-USDT$19.44
0.0071420 Eth
$231,082.00
12,037.000 LINK
0.0690%
60
KuCoin
LINK-BTC$19.45
0.0071430 Eth
$224,278.00
11,531.850 LINK
0.0661%
61
Bitci TR
LINK-TRY$19.46
0.0071460 Eth
$196,741.00
10,278.180 LINK
0.0589%
62
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$19.44
0.0071397 Eth
$188,168.00
9,756.398 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0559%
63
GMO Japan
LINK-JPY$19.58
0.0071948 Eth
$187,641.00
9,581.700 LINK
0.0549%
64
Hotcoin
LINK-BTC$19.54
0.0071572 Eth
$151,454.00
7,752.700 LINK
0.0444%
65
BYDFi
LINK-USDC$19.48
0.0071515 Eth
$141,352.00
7,254.440 LINK
0.0416%
66
Kraken
LINK-GBP$19.63
0.0072096 Eth
$138,445.00
7,052.752 LINK
0.0404%
67
DeGate
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$19.41
0.0071320 Eth
$137,905.00
7,161.386 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0411%
68
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$19.43
0.0071372 Eth
$128,772.00
6,676.865 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0383%
69
Coinbase Exchange
LINK-ETH$19.50
0.0071643 Eth
$114,838.00
5,889.040 LINK
0.0338%
70
BitStorage
LINK-ETH$19.45
0.0071424 Eth
$104,873.00
5,392.560 LINK
0.0309%
71
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$19.49
0.0071605 Eth
$100,893.00
99,554.923 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.5707%
72
Uniswap V4 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$19.55
0.0071817 Eth
$97,596.00
96,225.270 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.5516%
73
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$19.53
0.0071750 Eth
$97,120.00
5,031.725 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0288%
74
KuCoin
LINK-USDC$19.59
0.0071963 Eth
$91,553.00
4,672.571 LINK
0.0268%
75
Kanga
LINK-PLN$19.55
0.0071824 Eth
$85,134.00
0.000 LINK
0.0000%
76
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$19.34
0.0071043 Eth
$76,505.00
3,974.599 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0228%
77
Uniswap V4 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$19.42
0.0071331 Eth
$73,525.00
3,813.600 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0219%
78
BitMart
LINK-ETH$19.41
0.0071314 Eth
$69,017.00
3,555.140 LINK
0.0204%
79
Binance US
LINK-USDT$19.46
0.0071483 Eth
$56,985.00
2,927.962 LINK
0.0168%
80
Bitso
LINK-USD$19.50
0.0071514 Eth
$50,530.00
2,591.399 LINK
0.0149%
81
Binance US
LINK-BTC$19.40
0.0071278 Eth
$46,678.00
2,405.994 LINK
0.0138%
82
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$19.44
0.0071410 Eth
$44,201.00
2,296.778 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0132%
83
Hotcoin
LINK-ETH$19.47
0.0071460 Eth
$42,933.00
2,205.150 LINK
0.0126%
84
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XDAC17F958D2EE523A2206206994597C13D831EC7$19.55
0.0071811 Eth
$38,425.00
1,992.098 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0114%
85
EXMO
LINK-BTC$19.48
0.0071552 Eth
$37,069.00
1,902.758 LINK
0.0109%
86
Uniswap V4 (Arbitrum)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$19.50
0.0071642 Eth
$33,862.00
1,751.216 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0100%
87
THENA FUSION
0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$19.41
0.0071291 Eth
$22,149.00
29.936 0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827
0.0002%
88
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$19.44
0.0071425 Eth
$16,610.31
16,477.229 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.0945%
89
Uniswap V3 (Avalanche)
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$19.38
0.0071189 Eth
$14,661.64
751.233 0X5947BB275C521040051D82396192181B413227A3
0.0043%
90
Dex-Trade
LINK-ETH$19.43
0.0071384 Eth
$14,153.45
728.440 LINK
0.0042%
91
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$19.44
0.0071418 Eth
$13,994.63
726.345 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0042%
92
Bitexen
LINK-TRY$19.30
0.0070858 Eth
$12,212.60
632.819 LINK
0.0036%
93
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X55D398326F99059FF775485246999027B3197955$19.50
0.0071632 Eth
$11,889.65
618.991 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0035%
94
Uniswap V3 (BSC)
0XCF6BB5389C92BDDA8A3747DDB454CB7A64626C63-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$19.81
0.0072778 Eth
$11,321.58
1,370.165 0XCF6BB5389C92BDDA8A3747DDB454CB7A64626C63
0.0079%
95
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X1BFD67037B42CF73ACF2047067BD4F2C47D9BFD6$19.53
0.0071746 Eth
$9,513.08
491.310 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0028%
96
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$19.46
0.0071475 Eth
$8,334.35
432.860 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0025%
97
LFJ
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$19.57
0.0071907 Eth
$8,168.62
418.715 0X5947BB275C521040051D82396192181B413227A3
0.0024%
98
CoinEx
LINK-USDC$19.50
0.0071469 Eth
$7,588.36
399.423 LINK
0.0023%
99
Uniswap V3 (Arbitrum One)
0XBA5DDD1F9D7F570DC94A51479A000E3BCE967196-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$19.49
0.0071597 Eth
$7,118.28
26.979 0XBA5DDD1F9D7F570DC94A51479A000E3BCE967196
0.0002%
100
Uniswap V3 (Ethereum)
0X7FC66500C84A76AD7E9C93437BFC5AC33E2DDAE9-0X514910771AF9CA656AF840DFF83E8264ECF986CA$19.42
0.0071332 Eth
$4,490.52
16.990 0X7FC66500C84A76AD7E9C93437BFC5AC33E2DDAE9
0.0001%

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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