WOYALE.
A betting pool is a pot that bettors fund together. The people who back the winning outcome split the pot. The operator does not take the other side of your bet: it takes a fixed percentage off the top and shares out the rest. The formal name is pari-mutuel betting, from the French for “mutual stake”.
You are betting against other bettors, not against the house. Your payout depends on how much money sits on each outcome when betting closes.
The formula
Three steps work out every pool payout:
- Total pot = all stakes from all bettors.
- Net pot = total pot × (1 minus takeout rate).
- Payout per $1 on the winner = net pot ÷ total staked on the winning outcome.
Your return is your stake times that figure. It already includes your own stake, so profit is the return minus what you put in.
Worked example
A two-team game. The pool is open and bettors stake:
| Outcome | Total staked |
|---|---|
| Team A wins | $6,000 |
| Team B wins | $4,000 |
| Total pot | $10,000 |
The operator’s takeout is 10%.
- Takeout: $10,000 × 0.10 = $1,000
- Net pot: $10,000 − $1,000 = $9,000
If Team B wins: the $9,000 is split among the $4,000 of winning stakes. That is $9,000 ÷ $4,000 = $2.25 returned per $1 staked. A bettor who put $50 on Team B gets $112.50 back, a profit of $62.50.
If Team A wins: $9,000 ÷ $6,000 = $1.50 per $1. A $50 stake returns $75, a profit of $25.
Team B paid more because fewer people backed it. The pool prices itself: the more money on an outcome, the less each dollar on it returns.
In American odds terms, $2.25 per $1 is +125 and $1.50 per $1 is +50. See odds formats explained for the conversions.
Your price can move until betting closes
In a fixed-odds sportsbook, the price you see is the price you get. In a pool, the figure on screen is an estimate based on the money in so far. It changes with every new bet.
Say $2,000 more arrives on Team B just before close. Now:
| Outcome | Total staked |
|---|---|
| Team A wins | $6,000 |
| Team B wins | $6,000 |
| Total pot | $12,000 |
Net pot at 10% takeout: $10,800. If Team B wins, the payout is $10,800 ÷ $6,000 = $1.80 per $1. Your $50 now returns $90, not $112.50. You had no control over that, and no way to lock in the earlier figure.
This is the main trade-off. You get no price guarantee, but the operator carries no risk on the result, because it pays out only what the pool holds.
Why the operator doesn’t care who wins
The operator’s cut is a percentage of the pot, set before any bets are placed. If the takeout is 10% and the pot is $10,000, it keeps $1,000 whether Team A or Team B wins. That is why a pool can be run with no exposure to a bad result.
The operator’s income rises with volume, not with beating bettors. On the other hand, the takeout is a certain cost to you on every bet. A larger takeout means a lower payout for the same pool.
What takeout does to your long-run results
Take the balanced example. If the two sides were equal at $5,000 each and the takeout was 10%, the net pot would be $9,000 and every winning dollar would return $1.80. On a coin-flip bet with true 50% odds, you would expect $0.90 back per $1 staked, on average. The 10% takeout is the cost of playing.
The margin in a fixed-odds line is compared in pari-mutuel vs fixed odds.
Where you see pools
- Horse racing: pari-mutuel is the standard system for US racetracks and their betting services. States license and regulate it through racing commissions. The California Horse Racing Board, for example, describes its role as regulating pari-mutuel wagering for public protection. At the federal level, the Interstate Horseracing Act sets the policy for interstate wagering on horse races.
- Fantasy and contest-style pools: entry fees go into a prize pot and a cut goes to the operator.
- User-run pools: some crypto sites let players create pools on events, with a smart contract or the site holding the pot and applying a stated fee.
Whether a given pool is legal depends on where you are and who runs it. For crypto pools on unlicensed sites, the rules in state law apply, and offshore sites are not licensed in any US state.
Things to check before you stake
- The takeout rate should be stated before you bet, not after.
- Betting close time: after that point, odds are final.
- What happens with no winner: some pools refund stakes, some roll the pot over, and some keep the pot. The rules should say.
- Rounding and minimum payouts: some operators round down payouts to the nearest cent or dime.
- How the pot is held: a site holding your crypto is a counterparty risk of its own. See what provably fair doesn’t prove for the general point about solvency.
Common questions
Who pays me if I win a pool?
The pot does, funded by the losing bettors’ stakes. The operator only takes its percentage and runs the pool.
Can a pool lose money for the operator?
Not on the result, because payouts come out of the pot. It can lose money through other costs or failures, such as technical faults or refunds when a pool is cancelled.
Are pool winnings taxable?
Gambling winnings are generally taxable income in the US, whatever the betting format. See crypto gambling winnings.