ETH Price: $2,730.56 (+1.46%)
Gas: 0.8 Gwei

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

735,007 (0.00%)

Market

Price

$19.53 @ 0.007152 ETH (+5.17%)

Onchain Market Cap

$19,530,000,000.00

Circulating Supply Market Cap

$12,459,932,327.00

Other Info

Token Contract (WITH 18 Decimals)

Filtered by Token Holder
Paxos
Balance
0 LINK

Value
$0.00
0xc5a8859c44ac8aa2169afacf45b87c08593bec10
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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 17654.55% |ETH 0.0003846 1759.59%

Market

Volume (24H):$569,418,911.00
Market Capitalization:$12,459,932,327.00
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$19.60
0.0071812 Eth
$63,579,129.00
3,299,468.320 LINK
18.9371%
2
MEXC
LINK-USDT$19.59
0.0071757 Eth
$35,924,629.00
1,834,147.040 LINK
10.5270%
3
Coinbase Exchange
LINK-USD$19.58
0.0071706 Eth
$34,763,684.00
1,775,922.540 LINK
10.1928%
4
Bybit
LINK-USDT$19.61
0.0071829 Eth
$26,353,482.00
1,368,946.247 LINK
7.8570%
5
HTX
LINK-USDT$19.59
0.0071780 Eth
$19,779,273.00
1,031,616.218 LINK
5.9209%
6
P2B
LINK-USDT$19.57
0.0071689 Eth
$12,997,491.00
664,107.930 LINK
3.8116%
7
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$19.55
0.0071607 Eth
$10,737,643.00
556,045.427 0X514910771AF9CA656AF840DFF83E8264ECF986CA
3.1914%
8
OKX
LINK-USDT$19.60
0.0071811 Eth
$9,498,442.00
492,944.989 LINK
2.8292%
9
DigiFinex
LINK-USDT$19.59
0.0071782 Eth
$8,256,208.00
421,349.680 LINK
2.4183%
10
Gate.io
LINK-USDT$19.58
0.0071728 Eth
$6,836,636.00
354,348.420 LINK
2.0338%
11
XT.COM
LINK-USDT$19.51
0.0071522 Eth
$6,350,092.00
329,570.780 LINK
1.8916%
12
KuCoin
LINK-USDT$19.60
0.0071798 Eth
$5,680,323.00
289,794.034 LINK
1.6633%
13
WhiteBIT
LINK-USDT$19.53
0.0071703 Eth
$5,639,152.00
288,739.650 LINK
1.6572%
14
Coinstore
LINK-USDT$19.52
0.0071488 Eth
$5,618,187.00
291,841.070 LINK
1.6750%
15
CoinW
LINK-USDT$19.56
0.0071668 Eth
$5,041,360.00
257,799.050 LINK
1.4796%
16
BTSE
LINK-USDT$19.59
0.0071768 Eth
$5,018,479.00
256,181.299 LINK
1.4703%
17
Binance
LINK-FDUSD$19.49
0.0071459 Eth
$4,530,044.00
235,274.890 LINK
1.3503%
18
Hotcoin
LINK-USDT$19.56
0.0071644 Eth
$4,353,383.00
222,539.560 LINK
1.2773%
19
Kraken
LINK-USD$19.59
0.0071749 Eth
$3,868,178.00
197,501.234 LINK
1.1335%
20
Azbit
LINK-USDT$19.45
0.0071496 Eth
$3,719,884.00
193,146.071 LINK
1.1086%
21
BYDFi
LINK-USDT$19.45
0.0071480 Eth
$3,574,377.00
183,771.320 LINK
1.0547%
22
LATOKEN
LINK-USDT$19.56
0.0071644 Eth
$3,155,857.00
161,323.541 LINK
0.9259%
23
Coinbase Exchange
LINK-EUR$19.62
0.0071867 Eth
$2,568,913.00
130,947.070 LINK
0.7516%
24
QMall
LINK-USDT$19.58
0.0071750 Eth
$2,551,530.00
132,435.937 LINK
0.7601%
25
FMCPAY
LINK-USDT$19.51
0.0071518 Eth
$2,075,473.00
107,971.613 LINK
0.6197%
26
Dex-Trade
LINK-USDT$19.58
0.0071773 Eth
$2,060,997.00
105,249.620 LINK
0.6041%
27
MEXC
LINK-USDC$19.57
0.0071718 Eth
$1,961,274.00
100,224.570 LINK
0.5752%
28
Bitvavo
LINK-EUR$19.53
0.0071571 Eth
$1,940,109.00
99,346.428 LINK
0.5702%
29
CoinEx
LINK-USDT$19.53
0.0071504 Eth
$1,701,998.00
87,752.476 LINK
0.5037%
30
Coinbase Exchange
LINK-GBP$19.63
0.0071897 Eth
$1,652,776.00
84,213.090 LINK
0.4833%
31
Biconomy.com
LINK-USDT$19.58
0.0071724 Eth
$1,571,907.00
81,828.720 LINK
0.4697%
32
FMCPAY
LINK-ETH$19.56
0.0071637 Eth
$1,266,286.00
65,766.400 LINK
0.3775%
33
PointPay
LINK-USDT$19.57
0.0071729 Eth
$1,000,561.00
51,904.448 LINK
0.2979%
34
tanX
LINK-USDC$19.55
0.0071613 Eth
$835,525.00
43,585.130 LINK
0.2502%
35
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$19.49
0.0071379 Eth
$793,518.00
41,344.686 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.2373%
36
Trubit
LINK-USDT$19.51
0.0071535 Eth
$749,170.00
39,074.160 LINK
0.2243%
37
EXMO
LINK-USDT$19.61
0.0071820 Eth
$726,370.00
37,050.092 LINK
0.2126%
38
Phemex
LINK-USDT$19.56
0.0071637 Eth
$683,322.00
34,930.560 LINK
0.2005%
39
LATOKEN
LINK-BTC$19.59
0.0071755 Eth
$648,444.00
33,107.266 LINK
0.1900%
40
Binance
LINK-EUR$19.58
0.0071687 Eth
$646,232.00
33,544.880 LINK
0.1925%
41
Gemini
LINK-USD$19.57
0.0071712 Eth
$644,784.00
32,940.276 LINK
0.1891%
42
Bitbank
LINK-JPY$19.59
0.0071764 Eth
$610,092.00
31,141.758 LINK
0.1787%
43
WhiteBIT
LINK-BTC$19.47
0.0071490 Eth
$595,958.00
30,605.250 LINK
0.1757%
44
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$19.55
0.0071626 Eth
$585,535.00
30,383.835 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1744%
45
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$19.53
0.0071550 Eth
$584,544.00
577,317.766 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
3.3135%
46
BigONE
LINK-USDT$19.57
0.0071661 Eth
$578,963.00
29,586.160 LINK
0.1698%
47
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$19.53
0.0071550 Eth
$558,139.00
28,906.560 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1659%
48
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$19.52
0.0071504 Eth
$556,149.00
28,975.920 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1663%
49
Binance
LINK-TRY$19.51
0.0071645 Eth
$531,697.00
27,691.370 LINK
0.1589%
50
QMall
LINK-USDC$19.57
0.0071669 Eth
$500,210.00
25,939.647 LINK
0.1489%
51
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$19.53
0.0071556 Eth
$493,140.00
25,374.478 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1456%
52
Bitbegin
LINK-USDT$19.54
0.0071572 Eth
$462,445.00
24,074.720 LINK
0.1382%
53
EarnBIT
LINK-USDT$19.55
0.0071652 Eth
$442,227.00
22,950.146 LINK
0.1317%
54
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$19.55
0.0071607 Eth
$405,076.00
39,644.606 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.2275%
55
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$19.54
0.0071604 Eth
$393,475.00
20,338.966 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1167%
56
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$19.49
0.0071384 Eth
$348,991.00
18,168.287 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.1043%
57
BitMart
LINK-BTC$19.55
0.0071630 Eth
$268,420.00
13,728.520 LINK
0.0788%
58
OKX
LINK-USDC$19.60
0.0071795 Eth
$266,850.00
13,816.511 LINK
0.0793%
59
BitDelta
LINK-USDT$19.51
0.0071522 Eth
$227,220.00
11,839.000 LINK
0.0679%
60
KuCoin
LINK-BTC$19.60
0.0071777 Eth
$227,015.00
11,585.035 LINK
0.0665%
61
GMO Japan
LINK-JPY$19.41
0.0071214 Eth
$205,226.00
10,575.400 LINK
0.0607%
62
Bitci TR
LINK-TRY$19.62
0.0071931 Eth
$196,175.00
10,263.530 LINK
0.0589%
63
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$19.55
0.0071607 Eth
$189,704.00
9,852.134 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0565%
64
Tokpie
LINK-USDT$19.44
0.0071199 Eth
$166,698.00
8,576.975 LINK
0.0492%
65
CoinTR
LINK-TRY$19.56
0.0071674 Eth
$159,176.00
8,319.700 LINK
0.0478%
66
Hotcoin
LINK-BTC$19.52
0.0071563 Eth
$151,872.00
7,778.390 LINK
0.0446%
67
BYDFi
LINK-USDC$19.54
0.0071750 Eth
$142,586.00
7,295.980 LINK
0.0419%
68
DeGate
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$19.57
0.0071744 Eth
$138,838.00
7,196.173 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0413%
69
Kraken
LINK-GBP$19.40
0.0071053 Eth
$137,461.00
7,087.225 LINK
0.0407%
70
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$19.46
0.0071245 Eth
$128,354.00
6,643.049 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0381%
71
Coinbase Exchange
LINK-BTC$19.58
0.0071698 Eth
$125,973.00
6,434.730 LINK
0.0369%
72
Coinbase Exchange
LINK-ETH$19.55
0.0071603 Eth
$115,150.00
5,889.040 LINK
0.0338%
73
BitStorage
LINK-ETH$19.56
0.0071624 Eth
$106,540.00
5,447.220 LINK
0.0313%
74
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$19.53
0.0071523 Eth
$102,249.00
100,648.314 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.5777%
75
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$19.49
0.0071382 Eth
$101,506.00
5,270.579 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0303%
76
Uniswap V4 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$19.51
0.0071434 Eth
$99,176.00
97,914.231 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.5620%
77
KuCoin
LINK-USDC$19.60
0.0071775 Eth
$93,582.00
4,775.809 LINK
0.0274%
78
Kanga
LINK-PLN$19.58
0.0071769 Eth
$85,515.00
0.000 LINK
0.0000%
79
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$19.47
0.0071318 Eth
$76,586.00
3,973.103 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0228%
80
Uniswap V4 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$19.52
0.0071473 Eth
$73,523.00
3,807.381 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0219%
81
BitMart
LINK-ETH$19.53
0.0071554 Eth
$69,569.00
3,561.960 LINK
0.0204%
82
Binance US
LINK-USDT$19.52
0.0071555 Eth
$57,754.00
2,958.435 LINK
0.0170%
83
Bitso
LINK-USD$19.52
0.0071557 Eth
$50,640.00
2,593.777 LINK
0.0149%
84
PancakeSwap (v2)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$19.43
0.0071188 Eth
$46,164.00
2,432.919 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0140%
85
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$19.48
0.0071342 Eth
$44,152.00
2,289.525 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0131%
86
Hotcoin
LINK-ETH$19.55
0.0071635 Eth
$43,425.00
2,221.680 LINK
0.0128%
87
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XDAC17F958D2EE523A2206206994597C13D831EC7$19.49
0.0071409 Eth
$39,268.00
2,038.159 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0117%
88
Uniswap V4 (Arbitrum)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$19.47
0.0071315 Eth
$35,207.00
1,824.519 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0105%
89
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$19.57
0.0071696 Eth
$23,198.00
1,193.951 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0069%
90
THENA FUSION
0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$19.41
0.0071068 Eth
$22,846.00
30.845 0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827
0.0002%
91
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$19.54
0.0071576 Eth
$16,753.90
16,522.900 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.0948%
92
Uniswap V3 (Avalanche)
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$19.74
0.0072288 Eth
$14,333.34
735.775 0X5947BB275C521040051D82396192181B413227A3
0.0042%
93
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$19.49
0.0071384 Eth
$14,272.97
741.266 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0043%
94
Dex-Trade
LINK-ETH$19.51
0.0071506 Eth
$14,249.02
730.510 LINK
0.0042%
95
Bitexen
LINK-TRY$19.35
0.0070949 Eth
$12,247.54
632.819 LINK
0.0036%
96
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X55D398326F99059FF775485246999027B3197955$19.45
0.0071228 Eth
$12,173.12
633.994 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0036%
97
Uniswap V3 (BSC)
0XCF6BB5389C92BDDA8A3747DDB454CB7A64626C63-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$19.59
0.0071739 Eth
$11,193.23
1,370.165 0XCF6BB5389C92BDDA8A3747DDB454CB7A64626C63
0.0079%
98
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X1BFD67037B42CF73ACF2047067BD4F2C47D9BFD6$19.53
0.0071566 Eth
$9,615.10
496.350 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0028%
99
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$19.42
0.0071130 Eth
$8,350.64
433.111 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0025%
100
LFJ
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$19.57
0.0071693 Eth
$8,082.01
415.161 0X5947BB275C521040051D82396192181B413227A3
0.0024%

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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