ETH Price: $2,782.11 (+3.86%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

738,459 ( 0.037%)

Market

Price

$17.96 @ 0.006456 ETH (+1.80%)

Onchain Market Cap

$17,960,000,000.00

Circulating Supply Market Cap

$11,462,212,423.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
0.00146715 LINK

Value
$0.03 ( ~1.07831928050094E-05 Eth) [0.0000%]
0x3d7c8a5f1d0bd592223bdc32f9f5a2659e1bf18e
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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 16227.27% |ETH 0.0003846 1578.63%

Market

Volume (24H):$552,649,808.00
Market Capitalization:$11,462,212,423.00
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
WhiteBIT
LINK-USDT$17.98
0.0064479 Eth
$53,836,505.00
2,994,732.640 LINK
16.3349%
2
Binance
LINK-USDT$17.96
0.0064446 Eth
$51,787,128.00
2,958,101.400 LINK
16.1351%
3
Bybit
LINK-USDT$17.97
0.0064512 Eth
$32,080,259.00
1,841,797.279 LINK
10.0462%
4
Coinbase Exchange
LINK-USD$17.99
0.0064536 Eth
$21,012,161.00
1,168,185.950 LINK
6.3719%
5
HTX
LINK-USDT$17.98
0.0064530 Eth
$20,185,766.00
1,151,093.610 LINK
6.2787%
6
P2B
LINK-USDT$17.95
0.0064392 Eth
$10,754,618.00
599,171.580 LINK
3.2682%
7
OKX
LINK-USDT$17.99
0.0064565 Eth
$10,657,679.00
609,400.053 LINK
3.3240%
8
Gate.io
LINK-USDT$17.99
0.0064565 Eth
$9,245,458.00
527,556.980 LINK
2.8776%
9
DigiFinex
LINK-USDT$17.98
0.0064552 Eth
$7,218,365.00
401,393.500 LINK
2.1894%
10
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$18.00
0.0064626 Eth
$6,546,239.00
361,258.658 0X514910771AF9CA656AF840DFF83E8264ECF986CA
1.9705%
11
KuCoin
LINK-USDT$18.00
0.0064598 Eth
$6,481,012.00
360,087.110 LINK
1.9641%
12
MEXC
LINK-EUR$18.00
0.0064613 Eth
$5,286,214.00
293,679.470 LINK
1.6019%
13
XT.COM
LINK-USDT$17.94
0.0064350 Eth
$5,140,428.00
293,646.150 LINK
1.6017%
14
MEXC
LINK-USDC$17.98
0.0064495 Eth
$5,051,089.00
280,912.030 LINK
1.5322%
15
Hotcoin
LINK-USDT$17.99
0.0064573 Eth
$4,772,643.00
265,305.090 LINK
1.4471%
16
LBank
LINK-USDT$17.99
0.0064573 Eth
$4,712,012.00
261,934.680 LINK
1.4287%
17
Coinstore
LINK-USDT$17.96
0.0064465 Eth
$4,705,149.00
268,812.030 LINK
1.4662%
18
Binance
LINK-FDUSD$17.98
0.0064548 Eth
$4,359,530.00
248,994.340 LINK
1.3582%
19
Binance
LINK-USDC$17.95
0.0064416 Eth
$4,282,118.00
244,536.640 LINK
1.3338%
20
CoinW
LINK-USDT$17.92
0.0064282 Eth
$4,046,170.00
225,827.880 LINK
1.2318%
21
Bitunix
LINK-USDT$17.98
0.0064507 Eth
$3,901,358.00
216,935.900 LINK
1.1833%
22
Kraken
LINK-USD$17.98
0.0064552 Eth
$3,462,928.00
192,568.019 LINK
1.0504%
23
Azbit
LINK-USDT$17.94
0.0064352 Eth
$3,103,457.00
177,277.381 LINK
0.9670%
24
BYDFi
LINK-USDT$17.98
0.0064488 Eth
$2,960,437.00
164,661.990 LINK
0.8982%
25
BTSE
LINK-USDT$17.99
0.0064572 Eth
$2,666,157.00
148,214.536 LINK
0.8084%
26
CoinEx
LINK-USDT$17.97
0.0064486 Eth
$2,486,595.00
142,723.497 LINK
0.7785%
27
QMall
LINK-USDT$17.99
0.0064573 Eth
$2,104,057.00
120,247.566 LINK
0.6559%
28
Biconomy.com
LINK-USDT$17.98
0.0064479 Eth
$1,776,166.00
101,415.430 LINK
0.5532%
29
Dex-Trade
LINK-USDT$17.95
0.0064382 Eth
$1,731,433.00
96,461.390 LINK
0.5262%
30
FMCPAY
LINK-USDT$17.99
0.0064570 Eth
$1,629,347.00
92,867.794 LINK
0.5066%
31
Bitvavo
LINK-EUR$17.96
0.0064420 Eth
$1,509,550.00
84,049.720 LINK
0.4585%
32
Bybit
LINK-USDC$17.93
0.0064378 Eth
$1,090,176.00
62,938.179 LINK
0.3433%
33
FMCPAY
LINK-ETH$17.92
0.0064300 Eth
$1,061,422.00
58,501.920 LINK
0.3191%
34
Coinbase Exchange
LINK-EUR$17.98
0.0064523 Eth
$1,049,318.00
58,363.440 LINK
0.3183%
35
Coinbase Exchange
LINK-GBP$17.99
0.0064548 Eth
$994,553.00
55,296.450 LINK
0.3016%
36
Trubit
LINK-USDT$17.95
0.0064352 Eth
$909,414.00
51,789.450 LINK
0.2825%
37
FMCPAY
LINK-BTC$17.97
0.0064477 Eth
$868,269.00
49,266.100 LINK
0.2687%
38
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$18.03
0.0064714 Eth
$780,729.00
42,787.941 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.2334%
39
PointPay
LINK-USDT$17.98
0.0064489 Eth
$754,133.00
43,132.439 LINK
0.2353%
40
tanX
LINK-USDC$17.98
0.0064505 Eth
$631,780.00
35,920.600 LINK
0.1959%
41
BigONE
LINK-USDT$18.06
0.0064795 Eth
$578,797.00
32,049.830 LINK
0.1748%
42
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$17.99
0.0064539 Eth
$571,233.00
32,000.615 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1745%
43
EXMO
LINK-USDT$17.98
0.0064538 Eth
$562,917.00
31,302.248 LINK
0.1707%
44
Phemex
LINK-USDT$17.97
0.0064454 Eth
$546,174.00
30,394.550 LINK
0.1658%
45
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$18.02
0.0064646 Eth
$517,722.00
28,294.967 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1543%
46
WhiteBIT
LINK-BTC$17.96
0.0064419 Eth
$515,288.00
28,696.740 LINK
0.1565%
47
EarnBIT
LINK-USDT$17.98
0.0064499 Eth
$510,143.00
29,153.772 LINK
0.1590%
48
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$17.98
0.0064533 Eth
$442,264.00
48,911.529 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.2668%
49
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$17.97
0.0064482 Eth
$404,062.00
22,317.220 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1217%
50
LATOKEN
LINK-BTC$17.95
0.0064403 Eth
$398,153.00
22,178.252 LINK
0.1210%
51
Bitbank
LINK-JPY$18.03
0.0064724 Eth
$391,316.00
21,697.681 LINK
0.1184%
52
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$17.97
0.0064489 Eth
$358,185.00
20,451.142 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1116%
53
Kraken
LINK-ETH$17.96
0.0064470 Eth
$352,285.00
19,615.061 LINK
0.1070%
54
Binance
LINK-TRY$18.01
0.0064643 Eth
$350,855.00
19,918.230 LINK
0.1086%
55
QMall
LINK-USDC$17.96
0.0064427 Eth
$320,637.00
18,326.215 LINK
0.1000%
56
BitMart
LINK-BTC$17.95
0.0064435 Eth
$291,564.00
16,239.080 LINK
0.0886%
57
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$17.96
0.0064473 Eth
$249,067.00
14,320.907 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0781%
58
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$17.90
0.0064239 Eth
$246,512.00
13,806.298 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0753%
59
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$17.97
0.0064482 Eth
$243,879.00
238,528.278 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
1.3011%
60
Slex
LINK-ETH$17.96
0.0064398 Eth
$231,585.00
12,729.050 LINK
0.0694%
61
Gemini
LINK-USD$17.99
0.0064578 Eth
$229,618.00
12,763.302 LINK
0.0696%
62
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$17.97
0.0064479 Eth
$183,882.00
10,121.637 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0552%
63
BitStorage
LINK-ETH$17.99
0.0064560 Eth
$175,636.00
9,765.660 LINK
0.0533%
64
BitDelta
LINK-USDT$17.98
0.0064505 Eth
$174,490.00
9,955.000 LINK
0.0543%
65
Bitci TR
LINK-TRY$18.07
0.0064821 Eth
$173,357.00
9,827.798 LINK
0.0536%
66
Hotcoin
LINK-BTC$17.99
0.0064547 Eth
$161,895.00
8,999.810 LINK
0.0491%
67
OKX
LINK-USDC$17.99
0.0064592 Eth
$159,303.00
9,094.179 LINK
0.0496%
68
BYDFi
LINK-USDC$17.90
0.0064239 Eth
$146,159.00
8,164.960 LINK
0.0445%
69
GMO Japan
LINK-JPY$17.98
0.0064551 Eth
$142,749.00
7,938.200 LINK
0.0433%
70
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$17.87
0.0064155 Eth
$136,483.00
7,783.147 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0425%
71
KuCoin
LINK-USDC$17.95
0.0064441 Eth
$132,478.00
7,378.474 LINK
0.0402%
72
bitcastle
LINK-USDT$17.98
0.0064528 Eth
$114,226.00
6,529.660 LINK
0.0356%
73
Bitkub
LINK-THB$17.95
0.0064440 Eth
$105,325.00
5,867.155 LINK
0.0320%
74
Gemini
LINK-BTC$17.93
0.0064369 Eth
$100,296.00
5,592.991 LINK
0.0305%
75
BitMart
LINK-ETH$17.96
0.0064451 Eth
$90,871.00
5,059.940 LINK
0.0276%
76
Bitso
LINK-USD$17.96
0.0064453 Eth
$88,351.00
4,919.414 LINK
0.0268%
77
KuCoin
LINK-BTC$17.97
0.0064490 Eth
$80,862.00
4,500.248 LINK
0.0245%
78
Uniswap V4 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$17.96
0.0064461 Eth
$70,717.00
3,893.072 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0212%
79
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$17.97
0.0064508 Eth
$60,451.00
3,321.034 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0181%
80
Kanga
LINK-PLN$17.95
0.0064371 Eth
$59,871.00
0.000 LINK
0.0000%
81
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$17.98
0.0064514 Eth
$59,318.00
3,366.897 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0184%
82
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$18.01
0.0064618 Eth
$53,336.00
51,843.518 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.2828%
83
Hotcoin
LINK-ETH$18.00
0.0064573 Eth
$45,483.00
2,527.400 LINK
0.0138%
84
Uniswap V3 (Avalanche)
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$17.95
0.0064449 Eth
$43,487.00
2,380.911 0X5947BB275C521040051D82396192181B413227A3
0.0130%
85
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$17.95
0.0064422 Eth
$35,985.00
1,983.845 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0108%
86
Uniswap V4 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$17.94
0.0064383 Eth
$35,028.00
34,389.597 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.1876%
87
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$18.00
0.0064595 Eth
$27,844.00
1,561.802 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0085%
88
Uniswap V4 (Ethereum)
0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48-0X514910771AF9CA656AF840DFF83E8264ECF986CA$17.94
0.0064382 Eth
$24,016.00
23,425.944 0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48
0.1278%
89
Dex-Trade
LINK-ETH$17.98
0.0064500 Eth
$21,586.00
1,200.730 LINK
0.0065%
90
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XDAC17F958D2EE523A2206206994597C13D831EC7$17.98
0.0064533 Eth
$19,704.67
1,125.472 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0061%
91
Uniswap V3 (BSC)
0XCF6BB5389C92BDDA8A3747DDB454CB7A64626C63-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$17.79
0.0063801 Eth
$14,951.23
1,768.989 0XCF6BB5389C92BDDA8A3747DDB454CB7A64626C63
0.0096%
92
CoinEx
LINK-USDC$17.87
0.0064108 Eth
$13,100.72
746.740 LINK
0.0041%
93
THENA FUSION
0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$17.87
0.0064130 Eth
$13,065.44
18.046 0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827
0.0001%
94
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X55D398326F99059FF775485246999027B3197955$17.90
0.0064268 Eth
$10,982.61
625.057 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0034%
95
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$17.98
0.0064489 Eth
$10,638.31
10,357.622 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.0565%
96
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$17.95
0.0064396 Eth
$10,112.87
577.213 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0031%
97
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFA7F8980B0F1E64A2062791CC3B0871572F1F7F0$17.89
0.0064194 Eth
$9,689.19
542.321 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0030%
98
Uniswap V3 (Arbitrum One)
0XBA5DDD1F9D7F570DC94A51479A000E3BCE967196-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$17.97
0.0064489 Eth
$8,572.09
34.265 0XBA5DDD1F9D7F570DC94A51479A000E3BCE967196
0.0002%
99
Pangolin
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$18.03
0.0064705 Eth
$8,233.64
446.827 0X5947BB275C521040051D82396192181B413227A3
0.0024%
100
Ace
LINK-USDT$17.87
0.0064152 Eth
$2,236.75
127.810 LINK
0.0007%

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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