How Prediction Market Prices Work (and What They Really Cost)

A prediction market doesn't display standard American odds like `-110` or `+150`. Instead, it quotes binary contracts priced between 1¢ and 99¢ that pay $1.00 if the event happens and $0.00 if it doesn't. To evaluate whether a prediction-market price is actually fair—or a disguised trap—you first need to translate cents into real betting odds.

Converting cents to American betting odds

Because a $1.00 contract's price in cents equals its raw implied probability, you can convert any contract price into standard odds using our Odds Converter:

• Price in cents ÷ 100 = raw implied probability. A 60¢ contract implies a 60% win probability.
• Decimal odds = 100 ÷ price in cents. 60¢ → 100 ÷ 60 = 1.67 decimal.
• American odds equivalent: 60¢ equals −150; 40¢ equals +150; 52.4¢ equals −110.

The hidden vig: Bid-Ask spreads and taker fees

Marketing materials for prediction markets often claim they have 'zero bookmaker vig.' In practice, retail bettors frequently pay *more* hidden juice on an exchange than they would on a reduced-juice sportsbook board:

• The Bid-Ask Gap: If the best bid on YES is 51¢ and the best ask is 55¢, the effective two-way market is `-122 / -104`—a steeper overround than a standard `-110 / -110` sportsbook line, and far worse than YouWager.lv's Friday 5% Football Juice Special (`-105 / -105`) or MLB True 10-Cent Dime Line. You can verify this immediately in our Hold & Vig Calculator.
• Exchange Taker & Settlement Fees: Most regulated exchanges charge per-contract transaction or profit fees when you cross the spread, quietly eroding your net payout.
• Missing Point Spreads & Key Numbers: Prediction markets primarily trade moneyline (winner) contracts. In football and basketball, where key numbers like 3 and 7 or alternate totals create the highest-value edges, a binary winner contract leaves you with far fewer ways to attack a matchup.