Rules of the Game

Ethex is an Ethereum smart-contract lottery game with huge prizes and big chances to win. The rules of the game are very simple and, with a wide range of prize combinations and full transparency through the use of smart-contracts, Ethex is an incredibly exciting game.

Ethex is provably fair and cryptographically secure. Players are required to guess the hash from the block using their bet transaction. The nature of the Ethereum blockchain makes it impossible to cheat.

System requirements

To play using Metamask (macOS, Windows):

  1. If you haven't already, download and install Metamask.
  2. Enable the extension and sign in to your Metamask account.
  3. Visit the Ethex website using the same browser.

To play using Coinbase Wallet (iOS, Android):

  1. Download Coinbase Wallet from the App Store or Google Play.
  2. Create a wallet or import your seed in Coinbase Wallet.
  3. Open the url in the DApps tab.

How to play?

The player needs to guess the last hexadecimal numbers of Ethereum block hash, using numbers from 1 to 6. The more symbols the player has matched, the greater their prize.

In each cell, the player can choose from the list one of the following values:

  • A specific symbol (0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F);
  • Any letter group (A, B, C, D, E, F);
  • Any number group (0, 1, 2, 3, 4, 5, 6, 7, 8, 9);
  • Any even number group (0, 2, 4, 6, 8);
  • Any odd number group (1, 3, 5, 7, 9);
  • Or leave the cell blank.

Using buttons "Frequent", "Rare", "Randomly", you can select different combinations of symbols automatically.

After you have selected symbols, you should set your bet amount. The minimum amount is 0.01 ETH for each selected symbol. While you select symbols, the amount is automatically adjusting to the lower bound. You can set greater amount, but not less than 0.01 ETH x [number of selected symbols].

Once everything is ready, you should click the "Place a bet" button and confirm your Ethereum transaction which contain your bet. Wait until miners calculate the block containing your transaction and smart-contract. Grab your prize.

Good luck!

How much can I win?

You win if you guess one or more symbols from the selected symbols group. Note that any symbols group has a higher chance of winning but a smaller prize. On the other hand, a specific symbol has a higher risk of losing but a greater potential prize. If you select only one symbol, your chances of winning and prize rate is as shown in the table below:

Selected symbols groupWin chancePrize rate
Any number group
(0, 1, 2, 3, 4, 5, 6, 7, 8, 9)
10 : 16
Highest chance!
Any letter group
(A, B, C, D, E, F)
6 : 16x2.6
Any even number group
(0, 2, 4, 6, 8)
5 : 16x3.2
Any odd number group
(1, 3, 5, 7, 9)
5 : 16x3.2
The specific symbol
(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F)
1 : 16x16
Highest rate!

If you select more symbols and guess them, their win rates are summed. If you select more symbols but guess less of them your prize rate will be lower than if you guess the exact number of cells, but you get the chance to win the Jackpot.

Note: prize rates are applied after deducting jackpot fee and house edge. The actual prize amount is limited to the current prize pool and is divided proportionally between all winners within the same block, according to their bet amounts.

Jackpots and Superprize

There are 4 types of guaranteed time-based jackpots in Ethex: Daily Jackpot, Weekly Jackpot, Monthly Jackpot and Season Jackpot plus one chance-based Superprize! When you select more than one cell, your bet is played 4 times for all types of jackpots, even if you didn't guess any symbols from the hash.

Jackpot TypeAmountDraw Time
Daily Jackpot1/7 of Weekly Jackpot amountEvery 5000 block
(roughly once a day)
Weekly Jackpot1/4 of Monthly Jackpot amountEvery 35000 block
(roughly once a week)
Monthly Jackpot1/3 of Season Jackpot amountEvery 150000 block
(roughly once a month)
Season Jackpot1/4 of total Jackpot amountEvery 450000 block
(roughly once every three months)
SuperprizeThe full Jackpot amountImmediately after the block with your bet is mined

How is the winner of jackpot decided?

When you select more than one cell and submit your bet, the smart-contract registers it for the jackpot draw. Its registration number is displayed on result screen as an index number of your bet within all bets registered to play for the jackpot. The process of deciding the winner of jackpot is very simple and straightforward.

When the block of jackpot of a specific type is mined (i.e. next 35000-th block for the Weekly Jackpot), smart-contract uses its hexadecimal hash to convert it into the number and starts to count every bet registered for the jackpot. If there are less bets than the hash number, it continues to count from the first bet again and again, and so on until the hash number ends. The last bet before the count ends is the winner of the jackpot.

If the count stops on one of your bets, congratulation – you win the jackpot!

To win the Superprize, you need to select the specific symbol for all 6 cells. If you guess all of the last 6 symbols of the next Ethereum block, you immediately win the whole prize pool and the full jackpot amount!

If you manage to guess all 6 symbol of the hash – you win the Superprize!

Note: if there is more than one person who guesses all 6 cells, the whole jackpot amount is divided proportionally between all winners, according to their bet amounts.