How Coinflip Works
Coinflip is a 1v1 wager game. Two players put up items of similar value and flip a coin. The winner takes all, minus a small pot fee.
How to Play
Create or join a game
Create a new coinflip by selecting items from your inventory, or join an existing game from the lobby by matching the other player's wager value.
Choose your side
The game creator picks a side (heads or tails). The joiner gets the other side automatically.
The coin flips
Once both players have joined, the coin flips. The result is determined by the provably fair system before either player commits.
Winner takes the pot
Settlement targets a fee worth 10% of the item pot. The exact deduction varies with item sizes, contribution caps and supported balance-deduction rules. The winner receives the remaining items; the displayed pot is before fees.
Odds & House Edge
Each side has a 50/50 chance of winning. Settlement targets a fee worth 10% of the item pot. The exact deduction varies with item sizes, contribution caps and supported balance-deduction rules. The winner receives the remaining items; the displayed pot is before fees.
Player-versus-player settlement prefers fee items from the losing side. Bot rounds use a separate fee based on the bot-side value, applied through its top-up or a supported balance deduction. Neither path guarantees exactly 90% of the displayed pot.
For a full breakdown of house edge across all game modes, see our What Are the Odds? page.
Provably Fair
Every Coinflip outcome on CaseRush.gg is determined using our provably fair system. Before each round, a server seed hash is published. After the round, the full server seed is revealed so you can independently verify the result was not manipulated.
The system uses HMAC-SHA256 with a combination of server seed, client seed, and nonce to generate verifiable random outcomes.
Frequently Asked Questions
Is the coinflip actually 50/50?
Yes. The coin flip is a true 50/50 result determined by the provably fair system. Each player has exactly the same chance of winning, regardless of the side chosen.
How is the pot fee calculated?
Settlement targets a fee worth 10% of the item pot. The exact deduction varies with item sizes, contribution caps and supported balance-deduction rules. The winner receives the remaining items; the displayed pot is before fees. Player-versus-player settlement prefers fee items from the losing side. Bot rounds use a separate fee based on the bot-side value, applied through its top-up or a supported balance deduction. Neither path guarantees exactly 90% of the displayed pot.
Can I cancel a coinflip I created?
Yes. You can cancel a coinflip you created while no one has joined. Once an opponent joins, the game proceeds automatically.
Do both players need items of equal value?
The joiner's items must fall within a value range around the creator's wager. This creates a fair matchup in which both sides have roughly equal value at stake.