ETH Price: $2,629.34 (-1.86%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

732,945 ( -0.038%)

Market

Price

$18.33 @ 0.006971 ETH (-3.64%)

Onchain Market Cap

$18,330,000,000.00

Circulating Supply Market Cap

$11,655,206,430.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
0 LINK

Value
$0.00
0xce63224c1d5cec3c2ba8d2327e1765fe90f2effb
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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 16563.64% |ETH 0.0003846 1712.53%

Market

Volume (24H):$485,685,475.00
Market Capitalization:$11,655,206,430.00
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
Coinbase Exchange
LINK-USD$18.28
0.0069476 Eth
$30,052,124.00
1,643,899.350 LINK
14.3337%
2
Bybit
LINK-USDT$18.29
0.0069512 Eth
$25,474,317.00
1,400,221.405 LINK
12.2090%
3
HTX
LINK-USDT$18.29
0.0069512 Eth
$20,520,011.00
1,127,655.689 LINK
9.8324%
4
P2B
LINK-USDT$18.26
0.0069529 Eth
$12,266,281.00
671,811.240 LINK
5.8578%
5
Gate.io
LINK-USDT$18.28
0.0069482 Eth
$9,123,965.00
501,784.740 LINK
4.3752%
6
Binance
LINK-USDC$18.30
0.0069547 Eth
$7,886,397.00
434,712.540 LINK
3.7904%
7
MEXC
LINK-USDT$18.30
0.0069544 Eth
$7,436,720.00
406,368.210 LINK
3.5433%
8
DigiFinex
LINK-USDT$18.28
0.0069474 Eth
$7,270,005.00
397,780.940 LINK
3.4684%
9
OKX
LINK-USDT$18.27
0.0069449 Eth
$7,154,050.00
393,556.255 LINK
3.4316%
10
XT.COM
LINK-USDT$18.28
0.0069474 Eth
$5,807,685.00
319,556.380 LINK
2.7863%
11
Coinstore
LINK-USDT$18.24
0.0069322 Eth
$5,255,481.00
289,337.040 LINK
2.5228%
12
BTSE
LINK-USDT$18.29
0.0069513 Eth
$5,145,298.00
281,316.601 LINK
2.4529%
13
KuCoin
LINK-USDT$18.28
0.0069485 Eth
$4,314,534.00
235,989.947 LINK
2.0577%
14
Binance
LINK-FDUSD$18.33
0.0069750 Eth
$4,237,956.00
232,988.810 LINK
2.0315%
15
CoinW
LINK-USDT$18.28
0.0069482 Eth
$4,236,913.00
231,783.260 LINK
2.0210%
16
Bitunix
LINK-USDT$18.27
0.0069463 Eth
$4,206,479.00
230,145.960 LINK
2.0067%
17
Hotcoin
LINK-USDT$18.30
0.0069544 Eth
$3,629,775.00
198,343.530 LINK
1.7294%
18
BYDFi
LINK-USDT$18.26
0.0069406 Eth
$3,317,664.00
181,703.180 LINK
1.5843%
19
LATOKEN
LINK-USDT$18.29
0.0069522 Eth
$2,879,647.00
157,451.489 LINK
1.3729%
20
Coinbase Exchange
LINK-EUR$18.30
0.0069552 Eth
$2,739,574.00
149,693.620 LINK
1.3052%
21
Kraken
LINK-USD$18.28
0.0069463 Eth
$2,705,431.00
148,025.973 LINK
1.2907%
22
QMall
LINK-USDT$18.26
0.0069528 Eth
$2,358,606.00
129,887.155 LINK
1.1325%
23
FMCPAY
LINK-USDT$18.27
0.0069404 Eth
$2,101,476.00
115,678.426 LINK
1.0086%
24
Dex-Trade
LINK-USDT$18.27
0.0069432 Eth
$1,927,967.00
105,501.910 LINK
0.9199%
25
Bitvavo
LINK-EUR$18.32
0.0069623 Eth
$1,907,773.00
104,137.227 LINK
0.9080%
26
Biconomy.com
LINK-USDT$18.28
0.0069441 Eth
$1,400,080.00
77,011.260 LINK
0.6715%
27
Coinbase Exchange
LINK-GBP$18.27
0.0069417 Eth
$1,173,838.00
64,253.430 LINK
0.5602%
28
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$18.31
0.0069617 Eth
$1,143,222.00
62,634.860 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.5461%
29
FMCPAY
LINK-ETH$18.29
0.0069498 Eth
$1,130,267.00
61,903.600 LINK
0.5398%
30
CoinEx
LINK-USDT$18.31
0.0069587 Eth
$1,049,915.00
57,759.442 LINK
0.5036%
31
FMCPAY
LINK-BTC$18.27
0.0069415 Eth
$1,029,223.00
56,509.100 LINK
0.4927%
32
PointPay
LINK-USDT$18.29
0.0069512 Eth
$908,581.00
50,020.932 LINK
0.4362%
33
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$18.24
0.0069337 Eth
$864,800.00
47,218.673 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.4117%
34
Gemini
LINK-USD$18.27
0.0069466 Eth
$756,494.00
41,396.558 LINK
0.3610%
35
Trubit
LINK-USDT$18.28
0.0069469 Eth
$678,453.00
37,281.650 LINK
0.3251%
36
EXMO
LINK-USDT$18.29
0.0069522 Eth
$627,474.00
34,302.402 LINK
0.2991%
37
Phemex
LINK-USDT$18.36
0.0069816 Eth
$610,812.00
33,272.510 LINK
0.2901%
38
Bitbank
LINK-JPY$18.35
0.0069741 Eth
$497,598.00
27,115.977 LINK
0.2364%
39
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$18.24
0.0069342 Eth
$451,450.00
23,573.602 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.2055%
40
BigONE
LINK-USDT$18.25
0.0069347 Eth
$440,473.00
24,139.360 LINK
0.2105%
41
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$18.26
0.0069430 Eth
$424,996.00
23,359.467 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.2037%
42
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$18.23
0.0069286 Eth
$395,032.00
43,999.318 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.3836%
43
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$18.28
0.0069502 Eth
$392,953.00
20,993.460 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1830%
44
Binance
LINK-TRY$18.40
0.0070102 Eth
$365,807.00
19,969.610 LINK
0.1741%
45
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$18.26
0.0069430 Eth
$333,064.00
18,299.534 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1596%
46
Slex
LINK-ETH$18.28
0.0069471 Eth
$296,183.00
16,229.730 LINK
0.1415%
47
BitMart
LINK-BTC$18.28
0.0069465 Eth
$277,507.00
15,183.180 LINK
0.1324%
48
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$18.26
0.0069415 Eth
$267,189.00
14,622.932 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1275%
49
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$18.23
0.0069291 Eth
$255,149.00
14,053.370 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.1225%
50
Coinbase Exchange
LINK-ETH$18.32
0.0069606 Eth
$231,899.00
12,661.520 LINK
0.1104%
51
Coinbase Exchange
LINK-BTC$18.30
0.0069535 Eth
$224,913.00
12,290.380 LINK
0.1072%
52
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$18.26
0.0069433 Eth
$218,554.00
217,673.679 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
1.8980%
53
BitDelta
LINK-USDT$18.20
0.0069352 Eth
$217,939.00
11,977.000 LINK
0.1044%
54
OKX
LINK-USDC$18.28
0.0069457 Eth
$208,626.00
11,511.599 LINK
0.1004%
55
LATOKEN
LINK-BTC$18.30
0.0069571 Eth
$207,104.00
11,315.939 LINK
0.0987%
56
Bybit
LINK-USDC$18.35
0.0069726 Eth
$204,515.00
11,250.124 LINK
0.0981%
57
Bitkub
LINK-THB$18.32
0.0069646 Eth
$185,142.00
10,103.321 LINK
0.0881%
58
Bitci TR
LINK-TRY$18.38
0.0069832 Eth
$179,190.00
9,774.860 LINK
0.0852%
59
KuCoin
LINK-USDC$18.30
0.0069539 Eth
$169,207.00
9,247.849 LINK
0.0806%
60
GMO Japan
LINK-JPY$18.28
0.0069483 Eth
$157,450.00
8,612.200 LINK
0.0751%
61
Uniswap V3 (Avalanche)
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$18.07
0.0068685 Eth
$145,300.00
7,967.526 0X5947BB275C521040051D82396192181B413227A3
0.0695%
62
CoinTR
LINK-TRY$18.41
0.0069956 Eth
$138,205.00
7,552.450 LINK
0.0659%
63
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$18.30
0.0069553 Eth
$135,684.00
7,427.560 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0648%
64
DeGate
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$18.25
0.0069361 Eth
$134,134.00
7,372.294 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0643%
65
Hotcoin
LINK-BTC$18.29
0.0069509 Eth
$126,349.00
6,908.180 LINK
0.0602%
66
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$18.23
0.0069286 Eth
$116,118.00
6,433.913 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0561%
67
BYDFi
LINK-USDC$18.23
0.0069451 Eth
$114,389.00
6,273.840 LINK
0.0547%
68
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$18.32
0.0069650 Eth
$96,500.00
5,294.454 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0462%
69
Bitso
LINK-USD$18.33
0.0069650 Eth
$81,192.00
4,429.457 LINK
0.0386%
70
BitMart
LINK-ETH$18.28
0.0069480 Eth
$75,211.00
4,114.140 LINK
0.0359%
71
CoinEx
LINK-USDC$18.26
0.0069374 Eth
$67,440.00
3,693.495 LINK
0.0322%
72
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$18.28
0.0069501 Eth
$63,200.00
3,445.894 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0300%
73
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$18.31
0.0069590 Eth
$60,182.00
59,709.242 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.5206%
74
WhiteBIT
LINK-TRY$18.43
0.0070044 Eth
$59,767.00
3,242.620 LINK
0.0283%
75
WhiteBIT
LINK-BTC$18.26
0.0069360 Eth
$59,719.00
3,271.090 LINK
0.0285%
76
EXMO
LINK-BTC$18.45
0.0070110 Eth
$42,068.00
2,280.383 LINK
0.0199%
77
Bitstamp
LINK-GBP$18.34
0.0069728 Eth
$39,921.00
2,176.343 LINK
0.0190%
78
LFJ
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$18.26
0.0069398 Eth
$34,493.00
1,881.965 0X5947BB275C521040051D82396192181B413227A3
0.0164%
79
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$18.24
0.0069354 Eth
$33,673.00
1,843.296 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0161%
80
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XDAC17F958D2EE523A2206206994597C13D831EC7$18.22
0.0069243 Eth
$32,679.00
1,808.110 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0158%
81
Hotcoin
LINK-ETH$18.30
0.0069553 Eth
$32,479.00
1,774.740 LINK
0.0155%
82
Gemini
LINK-BTC$18.32
0.0069656 Eth
$23,201.00
1,266.143 LINK
0.0110%
83
THENA FUSION
0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$18.34
0.0069717 Eth
$22,803.00
35.479 0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827
0.0003%
84
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$18.26
0.0069393 Eth
$19,994.08
1,074.610 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0094%
85
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFA7F8980B0F1E64A2062791CC3B0871572F1F7F0$18.28
0.0069452 Eth
$15,479.56
835.844 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0073%
86
HTX
LINK-BTC$18.25
0.0069367 Eth
$12,760.51
702.678 LINK
0.0061%
87
Dex-Trade
LINK-ETH$18.28
0.0069477 Eth
$12,223.11
668.640 LINK
0.0058%
88
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$18.35
0.0069746 Eth
$10,825.05
10,740.152 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.0936%
89
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X55D398326F99059FF775485246999027B3197955$18.29
0.0069520 Eth
$10,277.60
566.229 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0049%
90
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X1BFD67037B42CF73ACF2047067BD4F2C47D9BFD6$18.36
0.0069779 Eth
$9,972.61
547.085 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0048%
91
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$18.36
0.0069741 Eth
$9,355.66
513.786 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0045%
92
Uniswap V3 (Arbitrum One)
0XBA5DDD1F9D7F570DC94A51479A000E3BCE967196-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$18.32
0.0069590 Eth
$9,347.83
39.439 0XBA5DDD1F9D7F570DC94A51479A000E3BCE967196
0.0003%
93
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$18.28
0.0069450 Eth
$8,122.51
444.291 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0039%
94
Biswap V3
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$18.33
0.0069672 Eth
$6,360.85
330.129 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0029%
95
PancakeSwap V1 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$18.30
0.0069559 Eth
$5,244.86
272.913 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0024%
96
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XD93F7E271CB87C23AAA73EDC008A79646D1F9912$18.20
0.0069176 Eth
$4,145.14
224.262 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0020%
97
Bitexen
LINK-TRY$18.20
0.0069317 Eth
$3,921.53
215.497 LINK
0.0019%
98
Lydia Finance
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$18.31
0.0069559 Eth
$3,659.60
200.077 0X5947BB275C521040051D82396192181B413227A3
0.0017%
99
CoinEx
LINK-BTC$18.37
0.0069766 Eth
$3,578.77
194.481 LINK
0.0017%
100
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$18.28
0.0069450 Eth
$2,175.59
113.079 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
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:
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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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