ETH Price: $2,639.63 (+1.23%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

720,970 ( 0.010%)

Market

Price

$12.15 @ 0.004603 ETH (+0.16%)

Onchain Market Cap

$12,150,000,000.00

Circulating Supply Market Cap

$7,614,541,489.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
22.88587514173449055 LINK

Value
$278.06 ( ~0.10534067984161 Eth) [0.0000%]
0x97F533A6d49C1c551fB8a973804e60117112C87b
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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 10945.45% |ETH 0.0003846 1096.83%

Market

Volume (24H):$367,806,159.00
Market Capitalization:$7,614,541,489.00
Circulating Supply:626,849,971.00 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
LBank
LINK-USDT$12.14
0.0046024 Eth
$38,414,419.00
3,164,617.180 LINK
18.1139%
2
Binance
LINK-USDT$12.16
0.0046031 Eth
$22,779,153.00
1,894,348.220 LINK
10.8430%
3
Coinbase Exchange
LINK-USD$12.15
0.0046056 Eth
$15,844,216.00
1,303,836.070 LINK
7.4630%
4
Bybit
LINK-USDT$12.16
0.0046076 Eth
$14,387,125.00
1,195,187.032 LINK
6.8411%
5
WhiteBIT
LINK-USDT$12.15
0.0046059 Eth
$14,095,143.00
1,159,790.250 LINK
6.6385%
6
HTX
LINK-USDT$12.15
0.0046056 Eth
$13,532,973.00
1,124,212.354 LINK
6.4348%
7
Websea
LINK-USDT$12.15
0.0046064 Eth
$10,076,827.00
0.000 LINK
0.0000%
8
Bitget
LINK-USDT$12.17
0.0046128 Eth
$9,183,857.00
762,240.345 LINK
4.3630%
9
WEEX
LINK-USDT$12.15
0.0046060 Eth
$5,482,932.00
455,680.350 LINK
2.6083%
10
Biconomy.com
LINK-USDT$12.14
0.0046017 Eth
$4,862,402.00
403,644.853 LINK
2.3104%
11
P2B
LINK-USDT$12.14
0.0046014 Eth
$4,663,103.00
384,232.030 LINK
2.1993%
12
Azbit
LINK-USDT$12.16
0.0046078 Eth
$4,635,895.00
385,116.830 LINK
2.2044%
13
Slex
LINK-USDT$12.15
0.0046048 Eth
$3,862,461.00
320,945.290 LINK
1.8370%
14
BVOX
LINK-USDT$12.14
0.0046034 Eth
$3,826,172.00
317,821.890 LINK
1.8192%
15
OKX
LINK-USDT$12.16
0.0046077 Eth
$3,396,862.00
282,574.424 LINK
1.6174%
16
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$12.22
0.0046324 Eth
$2,961,204.00
243,638.172 0X514910771AF9CA656AF840DFF83E8264ECF986CA
1.3946%
17
DigiFinex
LINK-USDT$12.16
0.0046076 Eth
$2,929,251.00
240,944.310 LINK
1.3791%
18
KuCoin
LINK-USDT$12.16
0.0046081 Eth
$2,442,994.00
200,920.910 LINK
1.1500%
19
Deepcoin
LINK-USDT$12.15
0.0046062 Eth
$2,404,339.00
207,275.440 LINK
1.1864%
20
Crypto.com Exchange
LINK-USDT$12.15
0.0046067 Eth
$2,146,981.00
176,633.590 LINK
1.0110%
21
XT.COM
LINK-USDT$12.14
0.0046012 Eth
$2,131,962.00
177,308.740 LINK
1.0149%
22
Trubit
LINK-USDT$12.15
0.0046052 Eth
$2,079,014.00
172,549.260 LINK
0.9876%
23
Upbit
LINK-KRW$12.15
0.0046066 Eth
$2,067,129.00
170,069.573 LINK
0.9735%
24
Gate.io
LINK-USDT$12.15
0.0046063 Eth
$1,892,332.00
157,585.300 LINK
0.9020%
25
AscendEX (BitMax)
LINK-USDT$12.17
0.0046107 Eth
$1,736,385.00
142,729.100 LINK
0.8170%
26
CoinW
LINK-USDT$12.14
0.0045997 Eth
$1,687,419.00
139,037.090 LINK
0.7958%
27
C-Patex
LINK-USDT$12.14
0.0046018 Eth
$1,687,186.00
138,986.472 LINK
0.7955%
28
Coinstore
LINK-USDT$12.14
0.0046016 Eth
$1,661,375.00
138,148.900 LINK
0.7907%
29
WhiteBIT
LINK-BTC$12.15
0.0046029 Eth
$1,602,906.00
131,979.270 LINK
0.7554%
30
Kraken
LINK-USD$12.15
0.0046040 Eth
$1,361,729.00
112,094.344 LINK
0.6416%
31
HashKey Global
LINK-USDT$12.15
0.0046029 Eth
$1,354,962.00
112,170.592 LINK
0.6420%
32
BYDFi
LINK-USDT$12.16
0.0046046 Eth
$1,091,804.00
89,795.460 LINK
0.5140%
33
Bitexen
LINK-TRY$12.13
0.0045990 Eth
$1,026,763.00
84,625.060 LINK
0.4844%
34
Bitexen
LINK-USDT$12.14
0.0046004 Eth
$969,743.00
79,901.980 LINK
0.4573%
35
FMCPAY
LINK-USDT$12.15
0.0046048 Eth
$969,147.00
80,562.474 LINK
0.4611%
36
Bitvavo
LINK-EUR$12.14
0.0046025 Eth
$940,968.00
77,499.112 LINK
0.4436%
37
FMFW.io
LINK-USDT$12.16
0.0046081 Eth
$929,049.00
76,408.450 LINK
0.4374%
38
Crypto.com Exchange
LINK-USD$12.16
0.0046075 Eth
$926,919.00
76,258.260 LINK
0.4365%
39
HitBTC
LINK-USDT$12.16
0.0046082 Eth
$919,893.00
76,408.450 LINK
0.4374%
40
Azbit
LINK-ETH$12.16
0.0046077 Eth
$884,517.00
72,942.112 LINK
0.4175%
41
Dex-Trade
LINK-USDT$12.15
0.0046054 Eth
$770,187.00
63,396.470 LINK
0.3629%
42
Bithumb
LINK-KRW$12.16
0.0046093 Eth
$702,182.00
57,734.874 LINK
0.3305%
43
CoinEx
LINK-USDT$12.16
0.0046074 Eth
$607,681.00
50,263.352 LINK
0.2877%
44
BigONE
LINK-USDT$12.13
0.0045974 Eth
$589,380.00
48,585.840 LINK
0.2781%
45
FMCPAY
LINK-BTC$12.14
0.0046017 Eth
$564,976.00
46,768.200 LINK
0.2677%
46
tanX
LINK-USDC$12.17
0.0046057 Eth
$536,363.00
44,601.650 LINK
0.2553%
47
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$12.15
0.0046072 Eth
$522,115.00
43,609.195 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.2496%
48
Bybit
LINK-USDC$12.15
0.0046055 Eth
$494,562.00
41,109.132 LINK
0.2353%
49
FMCPAY
LINK-ETH$12.16
0.0046111 Eth
$454,527.00
37,359.840 LINK
0.2138%
50
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$12.14
0.0046008 Eth
$426,806.00
35,341.052 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.2023%
51
Gemini
LINK-USD$12.16
0.0046083 Eth
$344,875.00
28,363.794 LINK
0.1624%
52
PointPay
LINK-USDT$12.16
0.0046091 Eth
$336,178.00
27,962.992 LINK
0.1601%
53
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$12.21
0.0046268 Eth
$324,704.00
26,776.547 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1533%
54
EXMO
LINK-USDT$12.15
0.0046053 Eth
$283,147.00
23,305.480 LINK
0.1334%
55
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$12.13
0.0045958 Eth
$272,799.00
22,462.542 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1286%
56
Phemex
LINK-USDT$12.15
0.0046049 Eth
$259,372.00
21,349.870 LINK
0.1222%
57
AscendEX (BitMax)
LINK-USD$12.16
0.0046071 Eth
$208,118.00
17,120.600 LINK
0.0980%
58
BitMart
LINK-BTC$12.16
0.0046072 Eth
$184,204.00
15,152.400 LINK
0.0867%
59
LATOKEN
LINK-BTC$12.15
0.0046062 Eth
$169,621.00
13,958.228 LINK
0.0799%
60
BitDelta
LINK-USDT$12.14
0.0046004 Eth
$152,778.00
12,691.000 LINK
0.0726%
61
BYDFi
LINK-USDC$12.15
0.0046050 Eth
$132,580.00
10,907.810 LINK
0.0624%
62
Coinbase Exchange
LINK-GBP$12.14
0.0046035 Eth
$120,300.00
9,905.900 LINK
0.0567%
63
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$12.11
0.0045885 Eth
$104,166.00
8,608.825 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0493%
64
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$12.17
0.0046137 Eth
$84,364.00
6,997.421 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0401%
65
Slex
LINK-BTC$12.17
0.0046109 Eth
$80,543.00
6,655.700 LINK
0.0381%
66
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$12.14
0.0046004 Eth
$69,969.00
69,318.156 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.3968%
67
WhiteBIT
LINK-TRY$12.15
0.0046050 Eth
$68,931.00
5,675.400 LINK
0.0325%
68
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$12.16
0.0046111 Eth
$68,243.00
67,175.438 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.3845%
69
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$12.14
0.0046032 Eth
$67,435.00
5,548.290 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0318%
70
Slex
LINK-ETH$12.14
0.0046018 Eth
$57,168.00
4,711.980 LINK
0.0270%
71
OKX
LINK-USDC$12.17
0.0046141 Eth
$44,761.00
3,736.317 LINK
0.0214%
72
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$12.14
0.0046004 Eth
$42,760.00
3,559.257 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0204%
73
GMO Japan
LINK-JPY$12.18
0.0046171 Eth
$34,011.00
2,792.900 LINK
0.0160%
74
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$12.11
0.0045898 Eth
$29,931.00
2,503.011 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0143%
75
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$12.19
0.0046190 Eth
$29,479.00
29,074.429 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.1664%
76
Bitso
LINK-USD$12.17
0.0046141 Eth
$26,454.00
2,173.237 LINK
0.0124%
77
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$12.19
0.0046210 Eth
$22,326.00
1,863.438 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0107%
78
EXMO
LINK-BTC$12.17
0.0046113 Eth
$21,623.00
1,777.193 LINK
0.0102%
79
Binance US
LINK-USDT$12.16
0.0046092 Eth
$19,619.01
1,613.573 LINK
0.0092%
80
KuCoin
LINK-KCS$12.14
0.0045996 Eth
$17,321.38
1,427.213 LINK
0.0082%
81
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$12.18
0.0046184 Eth
$16,949.96
1,395.427 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0080%
82
Pangolin
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$12.17
0.0046123 Eth
$15,563.91
1,278.761 0X5947BB275C521040051D82396192181B413227A3
0.0073%
83
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$12.09
0.0045826 Eth
$11,524.56
957.022 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0055%
84
Coinone
LINK-KRW$12.17
0.0046123 Eth
$8,957.59
736.053 LINK
0.0042%
85
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X68F180FCCE6836688E9084F035309E29BF0A2095$12.16
0.0046091 Eth
$8,027.50
692.779 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0040%
86
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$12.14
0.0046007 Eth
$7,551.67
7,436.894 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.0426%
87
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X1BFD67037B42CF73ACF2047067BD4F2C47D9BFD6$12.15
0.0046042 Eth
$6,768.02
559.960 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0032%
88
LFJ
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$12.16
0.0046085 Eth
$5,987.05
490.230 0X5947BB275C521040051D82396192181B413227A3
0.0028%
89
Ramses V2
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$12.15
0.0046069 Eth
$5,198.67
429.701 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0025%
90
CoinEx
LINK-USDC$12.20
0.0046237 Eth
$4,454.48
370.265 LINK
0.0021%
91
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X55D398326F99059FF775485246999027B3197955$12.16
0.0046110 Eth
$3,764.82
313.062 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0018%
92
CoinEx
LINK-BTC$12.13
0.0045992 Eth
$3,130.54
259.363 LINK
0.0015%
93
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$12.19
0.0046185 Eth
$2,080.89
173.335 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0010%
94
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$12.13
0.0045991 Eth
$1,636.35
136.107 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0008%
95
PancakeSwap V3 (Arbitrum)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$12.16
0.0046085 Eth
$1,612.96
133.170 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0008%
96
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$12.19
0.0046224 Eth
$954.56
78.447 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0004%
97
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X61299774020DA444AF134C82FA83E3810B309991$12.14
0.0045949 Eth
$702.10
57.673 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0003%
98
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$12.14
0.0045949 Eth
$514.57
506.745 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.0029%
99
Solidly V3 (Arbitrum)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$12.15
0.0046039 Eth
$275.33
22.688 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0001%
100
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XB33EAAD8D922B1083446DC23F610C2567FB5180F$12.12
0.0045876 Eth
$147.29
11.959 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
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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