Rules

How a flip plays

1. You create a duel with a stake (at least 1.00 CREDIT, no maximum). It waits in the open list until someone accepts it.
2. Until then you can cancel it for a full refund of your stake. No fee is taken.
3. Another player accepts by putting in the same stake. That locks the duel at that block. You can't accept your own duel.
4. The next 3 blocks decide. Their hashes, mixed with the duel's number, give a roll from 0 to 9,999: under 5,000 the creator wins, otherwise the one who accepted. Nobody knows those hashes when the duel locks, so nobody, including us, can pick the result.
5. The winner is paid the pot minus 2%. Our keeper sends it a moment after the blocks land, usually within seconds of the accept.

If the payment is slow: Claim now

Anyone may settle a locked duel, not just us. If the winner's payment hasn't arrived 30 seconds after the result, the winner sees Claim now and can settle it from their own wallet (you pay the network fee). If our keeper gets there first, it simply shows Paid.

A duel can be settled from 4 blocks after it locks until 288,000 blocks later (about 8 hours^*). If nobody settles it in that time, anyone can void it and both stakes are refunded in full.

Check it yourself

Every duel has its own page with a Verify link. It recomputes the roll in your browser from the three block hashes, with the same math the contract uses, and checks it against the on-chain result. See How it's fair.

How a round plays

• The first entry opens a round. It closes 3 minutes later (real time, not blocks), or at once on the 500th entry.
• Enter as often as you like, at least 1.00 CREDIT each time. Each entry adds to your share.
• Your chance = what you put in ÷ the pot. 30 in a 100 pot is a 30% chance.
• The winner is drawn from the hashes of the 3 blocks after the round closes. They pick a ticket number between 0 and the size of the pot; the entry whose running total first passes the ticket wins. A bigger entry covers more numbers, which is exactly its share.
• The winner receives the pot minus 3% of each entry, plus any boost (below).
• Only one player? There is no draw until 2 different wallets are in. If the timer runs out with one wallet, the round rolls over and waits, money in; when a 2nd wallet joins, the timer starts again. Every entry is locked in until the timer runs out; after that, until a 2nd wallet joins, the player alone in the round can take everything out on the Jackpot page, no fee.
• The next round opens with the next entry. An entry sent after the time is up closes the old round and starts a new one, so it never fails.

Boosts

Sometimes the house adds a boost to a round. A boost is paid to the winner only if the players' pot reaches 500.00 CREDIT, and only up to 2.5% of that pot, less than the 3% fee, so filling a boosted round with your own wallets can never pay. Whatever isn't paid goes back to the treasury.

Settling and checking

Like a duel, a closed round can be settled by anyone (our keeper does it within seconds) from 4 blocks after it closes, for about 8 hours^*. If nobody does, it can be voided and every entry is refunded (claim it on the Jackpot page). Every round has a Verify page that redraws the ticket in your browser.

Referrals

• The first time you bet with someone's referral link, that wallet becomes your referrer, for every game, forever. You can't refer yourself, and it can't be changed later.
• Your referrer gets 10% of every fee you pay from then on: of your coinflip and jackpot fees.
• It comes out of our share. You pay exactly the same with or without a referrer.

Wager mining (Season 1)

• 80% of the fees you pay come back as $CASINO during Season 1 (3 to 10 October, 00:00 UTC): coinflip and jackpot fees in settled games only. Jackpot rounds that paid a boost don't count.
• A 1,000 CREDIT bonus is shared out on top, in proportion to fees paid, among wallets that paid at least 1 CREDIT in fees during the season (about 50 CREDIT of coinflips). It is checked by hand before every payout, and wash play (betting against your own wallets, or a friend's, to farm rewards) is removed from the bonus. Those wallets still get their 80%.
• All of our fees, plus the bonus, buy $CASINO on the market. Payouts are sent from 0x7cf35cc2f9bc64ee39269e93b77ac95a1b666e9b after the season ends, and every swap and payout is listed on the mining page.
• Team wallets don't mine. Amounts shown during the season are estimates.

Where the money sits

Stakes and entries sit in the game contracts, never with us, until a result pays them out. Fees go to the treasury (a multi-signature Safe). Network fees (gas, in ETH) go to the chain, not to us.

What you can check yourself

• Any duel or jackpot round on How it's fair: the result is recomputed in your browser from the block hashes and compared with the contract's.
• The official contract addresses, listed in the footer of every page.

Playing responsibly

• 18+ only.
• Every bet shows what you stake, your chance and the fee before you confirm.
• After 3 losses in a row on a day you're down, we show you today's net before a rematch.
• My Games shows your net for today, the last 7 days and all time.