Guide
How Cointoss.gg works
Cointoss.gg is a live heads-or-tails game on Solana. Connect Phantom, fund coins with SOL, and bet each round before the flip. Outcomes are provably fair, and winners are paid at 1.9× your stake (5% house edge).
Connect with Phantom
Log in with the Phantom Solana wallet. On mobile, open the site inside Phantom’s in-app browser so the wallet can connect and sign a free login message (no gas for the sign-in message).
Deposit SOL for coins
Deposit SOL to receive coins used for betting. Your balance is tied to the wallet you used to log in. Withdraw coins back to SOL when you want funds returned (subject to site minimums and deposit rules).
Bet heads or tails
Each round opens a short betting window. Choose an amount, pick heads or tails, and join the live board. When the timer ends, the coin flips. If you win, you receive 1.9× your bet back (for example, a 100-coin win pays 190 coins).
House edge (5%)
Cointoss.gg is house-banked. A fair 50/50 flip at 2.00× would be zero edge. We pay 1.9× on wins instead, so expected value is about 95% of your stake over time — a transparent 5% house edge. The flip itself remains 50/50 and provably fair; the edge is only in the payout multiplier.
Verify fairness
Before betting locks, we publish a hash of the server seed. After the flip we reveal the seed so you can confirm the result matches the commitment. See Provably Fair for the full process.
Responsible play
Coin flip games involve risk. Only play with funds you can afford to lose. Cointoss.gg is intended for adults where such games are legal. Past results do not guarantee future outcomes.