ETH Price: $2,703.82 (+1.87%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

733,608 ( 0.020%)

Market

Price

$19.43 @ 0.007186 ETH (+3.56%)

Onchain Market Cap

$19,430,000,000.00

Circulating Supply Market Cap

$12,414,955,900.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
0 LINK

Value
$0.00
0x722e7789f82c53f8aec388a56176e19e45278207
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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 17563.64% |ETH 0.0003846 1768.43%

Market

Volume (24H):$537,139,160.00
Market Capitalization:$12,414,955,900.00
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$19.45
0.0072013 Eth
$27,807,103.00
1,429,450.610 LINK
10.5293%
2
Bybit
LINK-USDT$19.50
0.0072159 Eth
$24,164,727.00
1,266,579.819 LINK
9.3296%
3
HTX
LINK-USDT$19.48
0.0072052 Eth
$18,548,613.00
973,746.554 LINK
7.1726%
4
Slex
LINK-USDT$19.43
0.0071943 Eth
$15,593,162.00
819,253.550 LINK
6.0346%
5
P2B
LINK-USDT$19.44
0.0071968 Eth
$13,755,537.00
707,465.480 LINK
5.2112%
6
WhiteBIT
LINK-USDT$19.45
0.0072045 Eth
$11,043,187.00
567,671.300 LINK
4.1815%
7
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$19.49
0.0072193 Eth
$9,985,931.00
519,526.358 0X514910771AF9CA656AF840DFF83E8264ECF986CA
3.8268%
8
MEXC
LINK-USDT$19.47
0.0072041 Eth
$8,683,253.00
445,962.200 LINK
3.2850%
9
OKX
LINK-USDT$19.46
0.0071994 Eth
$8,597,890.00
448,940.784 LINK
3.3069%
10
DigiFinex
LINK-USDT$19.49
0.0072115 Eth
$8,468,754.00
434,494.810 LINK
3.2005%
11
Gate.io
LINK-USDT$19.42
0.0071888 Eth
$7,843,175.00
407,653.960 LINK
3.0028%
12
XT.COM
LINK-USDT$19.46
0.0072033 Eth
$6,661,684.00
348,052.290 LINK
2.5638%
13
Coinstore
LINK-USDT$19.44
0.0071967 Eth
$6,019,643.00
314,769.630 LINK
2.3186%
14
BTSE
LINK-USDT$19.40
0.0071850 Eth
$5,151,239.00
265,520.977 LINK
1.9558%
15
CoinW
LINK-USDT$19.40
0.0071861 Eth
$4,807,238.00
247,752.610 LINK
1.8249%
16
Bitunix
LINK-USDT$19.44
0.0071979 Eth
$4,803,108.00
247,096.500 LINK
1.8201%
17
Kraken
LINK-USD$19.46
0.0072012 Eth
$4,798,128.00
246,524.074 LINK
1.8159%
18
Binance
LINK-USDC$19.47
0.0072040 Eth
$4,703,160.00
245,703.060 LINK
1.8099%
19
Binance
LINK-FDUSD$19.45
0.0072003 Eth
$4,595,204.00
241,022.550 LINK
1.7754%
20
KuCoin
LINK-USDT$19.45
0.0071997 Eth
$3,873,465.00
199,136.532 LINK
1.4668%
21
BYDFi
LINK-USDT$19.49
0.0072115 Eth
$3,799,305.00
194,927.810 LINK
1.4358%
22
Hotcoin
LINK-USDT$19.41
0.0071899 Eth
$3,744,509.00
192,880.890 LINK
1.4208%
23
Bitvavo
LINK-EUR$19.44
0.0071966 Eth
$3,741,430.00
192,488.500 LINK
1.4179%
24
LATOKEN
LINK-USDT$19.44
0.0072000 Eth
$3,255,125.00
167,421.179 LINK
1.2332%
25
Coinbase Exchange
LINK-EUR$19.46
0.0072030 Eth
$3,079,003.00
158,220.120 LINK
1.1655%
26
QMall
LINK-USDT$19.44
0.0071980 Eth
$2,738,390.00
143,035.508 LINK
1.0536%
27
FMCPAY
LINK-USDT$19.39
0.0071826 Eth
$2,223,454.00
116,223.510 LINK
0.8561%
28
Dex-Trade
LINK-USDT$19.45
0.0071995 Eth
$2,180,152.00
112,096.880 LINK
0.8257%
29
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$19.39
0.0071770 Eth
$1,688,986.00
88,069.498 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.6487%
30
Biconomy.com
LINK-USDT$19.40
0.0071845 Eth
$1,494,829.00
78,237.580 LINK
0.5763%
31
Coinbase Exchange
LINK-GBP$19.51
0.0072178 Eth
$1,483,741.00
76,058.840 LINK
0.5603%
32
CoinEx
LINK-USDT$19.45
0.0071997 Eth
$1,479,366.00
77,401.105 LINK
0.5701%
33
FMCPAY
LINK-ETH$19.39
0.0071813 Eth
$1,307,825.00
68,139.680 LINK
0.5019%
34
Coinbase Exchange
LINK-ETH$19.42
0.0071887 Eth
$1,151,395.00
59,284.000 LINK
0.4367%
35
PointPay
LINK-USDT$19.42
0.0071907 Eth
$1,112,489.00
58,115.334 LINK
0.4281%
36
FMCPAY
LINK-BTC$19.42
0.0071902 Eth
$1,089,031.00
56,891.400 LINK
0.4191%
37
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$19.62
0.0072671 Eth
$1,054,568.00
55,112.971 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.4060%
38
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$19.49
0.0072193 Eth
$959,241.00
97,529.736 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.7184%
39
Trubit
LINK-USDT$19.39
0.0071797 Eth
$857,028.00
44,983.750 LINK
0.3314%
40
tanX
LINK-USDC$19.45
0.0071947 Eth
$820,291.00
43,009.750 LINK
0.3168%
41
Phemex
LINK-USDT$19.44
0.0071961 Eth
$749,330.00
38,549.390 LINK
0.2840%
42
EXMO
LINK-USDT$19.46
0.0072039 Eth
$721,868.00
37,090.179 LINK
0.2732%
43
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$19.46
0.0072019 Eth
$573,387.00
29,008.333 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.2137%
44
Bitbank
LINK-JPY$19.43
0.0071965 Eth
$567,543.00
29,208.273 LINK
0.2151%
45
BitStorage
LINK-USDT$19.43
0.0071922 Eth
$548,525.00
28,233.440 LINK
0.2080%
46
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$19.41
0.0071874 Eth
$545,042.00
28,310.598 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.2085%
47
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$19.47
0.0072117 Eth
$525,593.00
26,950.870 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1985%
48
Binance
LINK-TRY$19.47
0.0072043 Eth
$509,005.00
26,704.490 LINK
0.1967%
49
BigONE
LINK-USDT$19.42
0.0071909 Eth
$492,674.00
25,368.380 LINK
0.1869%
50
GMO Japan
LINK-JPY$19.41
0.0071849 Eth
$490,967.00
25,292.700 LINK
0.1863%
51
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$19.48
0.0072102 Eth
$447,051.00
23,498.451 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1731%
52
EarnBIT
LINK-USDT$19.45
0.0071953 Eth
$416,787.00
21,771.662 LINK
0.1604%
53
WhiteBIT
LINK-BTC$19.46
0.0072054 Eth
$399,341.00
20,525.400 LINK
0.1512%
54
QMall
LINK-USDC$19.45
0.0071999 Eth
$387,311.00
20,247.286 LINK
0.1491%
55
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$19.42
0.0071886 Eth
$382,276.00
19,901.913 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1466%
56
Gemini
LINK-USD$19.47
0.0072054 Eth
$361,499.00
18,562.664 LINK
0.1367%
57
HashKey Exchange
LINK-USD$19.53
0.0072308 Eth
$341,274.00
17,837.659 LINK
0.1314%
58
OKX
LINK-USDC$19.47
0.0072032 Eth
$324,044.00
16,907.288 LINK
0.1245%
59
Slex
LINK-ETH$19.44
0.0071967 Eth
$294,477.00
15,357.420 LINK
0.1131%
60
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$19.48
0.0072102 Eth
$292,945.00
286,294.571 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
2.1088%
61
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$19.43
0.0071942 Eth
$284,475.00
14,753.288 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1087%
62
BitMart
LINK-BTC$19.43
0.0071918 Eth
$267,349.00
13,761.000 LINK
0.1014%
63
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$19.47
0.0072086 Eth
$245,050.00
12,920.945 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0952%
64
BitDelta
LINK-USDT$19.41
0.0071896 Eth
$244,458.00
12,847.000 LINK
0.0946%
65
WhiteBIT
LINK-TRY$19.48
0.0072134 Eth
$184,560.00
9,475.520 LINK
0.0698%
66
Bitkub
LINK-THB$19.39
0.0071755 Eth
$181,053.00
9,339.417 LINK
0.0688%
67
LATOKEN
LINK-BTC$19.45
0.0071963 Eth
$171,413.00
8,812.076 LINK
0.0649%
68
CoinTR
LINK-TRY$19.43
0.0071928 Eth
$162,673.00
8,549.390 LINK
0.0630%
69
Coinbase Exchange
LINK-BTC$19.42
0.0071854 Eth
$161,833.00
8,333.180 LINK
0.0614%
70
DeGate
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$19.37
0.0071741 Eth
$145,988.00
7,695.607 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0567%
71
bitcastle
LINK-USDT$19.45
0.0071985 Eth
$143,908.00
7,525.590 LINK
0.0554%
72
Hotcoin
LINK-BTC$19.42
0.0071906 Eth
$131,948.00
6,795.980 LINK
0.0501%
73
Binance US
LINK-USDT$19.43
0.0071972 Eth
$120,355.00
6,193.383 LINK
0.0456%
74
BitStorage
LINK-ETH$19.43
0.0071918 Eth
$118,882.00
6,118.470 LINK
0.0451%
75
BYDFi
LINK-USDC$19.38
0.0071776 Eth
$117,696.00
6,072.850 LINK
0.0447%
76
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$19.38
0.0071778 Eth
$110,437.00
5,813.816 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0428%
77
KuCoin
LINK-USDC$19.49
0.0072136 Eth
$106,142.00
5,446.345 LINK
0.0401%
78
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$19.39
0.0071770 Eth
$94,303.00
91,939.796 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.6772%
79
PancakeSwap (v2)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$19.44
0.0071965 Eth
$91,254.00
4,691.021 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0346%
80
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$19.40
0.0071828 Eth
$89,959.00
4,696.490 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0346%
81
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$19.37
0.0071707 Eth
$88,390.00
4,650.178 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0343%
82
Bitso
LINK-USD$19.44
0.0071945 Eth
$88,240.00
4,539.747 LINK
0.0334%
83
BitMart
LINK-ETH$19.41
0.0071873 Eth
$71,834.00
3,701.200 LINK
0.0273%
84
Uniswap V4 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$19.40
0.0071836 Eth
$68,339.00
67,032.300 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.4938%
85
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XDAC17F958D2EE523A2206206994597C13D831EC7$19.38
0.0071786 Eth
$65,668.00
3,461.036 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0255%
86
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$19.44
0.0071939 Eth
$54,542.00
2,829.064 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0208%
87
Uniswap V4 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$19.45
0.0072020 Eth
$53,372.00
2,774.100 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0204%
88
Hotcoin
LINK-ETH$19.46
0.0072005 Eth
$36,444.00
1,872.510 LINK
0.0138%
89
Binance US
LINK-BTC$19.47
0.0072151 Eth
$34,904.00
1,792.566 LINK
0.0132%
90
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$19.47
0.0072113 Eth
$24,674.00
1,264.254 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0093%
91
Dex-Trade
LINK-ETH$19.37
0.0071848 Eth
$15,835.05
817.450 LINK
0.0060%
92
Uniswap V4 (Arbitrum)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$19.37
0.0071736 Eth
$15,570.61
819.193 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0060%
93
THENA FUSION
0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$19.51
0.0072270 Eth
$14,626.55
21.203 0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827
0.0002%
94
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$19.45
0.0071980 Eth
$14,301.66
727.941 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0054%
95
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$19.46
0.0072006 Eth
$13,562.25
13,267.100 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.0977%
96
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$19.41
0.0071836 Eth
$13,129.46
684.485 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0050%
97
LFJ
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$19.45
0.0071968 Eth
$12,455.56
643.183 0X5947BB275C521040051D82396192181B413227A3
0.0047%
98
Uniswap V3 (Arbitrum One)
0XBA5DDD1F9D7F570DC94A51479A000E3BCE967196-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$19.35
0.0071580 Eth
$11,132.97
43.115 0XBA5DDD1F9D7F570DC94A51479A000E3BCE967196
0.0003%
99
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$19.46
0.0072017 Eth
$11,062.88
582.700 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0043%
100
Pangolin
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$19.44
0.0071964 Eth
$9,507.42
492.664 0X5947BB275C521040051D82396192181B413227A3
0.0036%

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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