Parlay Builder uses AI and historical statistical analysis to help you research player props and team bets. It aggregates odds from major sportsbooks (DraftKings, FanDuel, BetMGM, Caesars, BetRivers) and computes hit rates, expected value (EV), trends, consistency and streaks to surface the highest-value betting opportunities across NBA, NFL, MLB and WNBA.
Expected Value (EV) is the average profit or loss you can expect from a bet over the long run. A positive EV (+EV) bet is profitable over time; a negative EV (-EV) bet loses money over time. EV = (win probability x profit if you win) - (loss probability x amount staked). Consistently betting +EV is the foundation of profitable betting.
A +EV bet exists when the true probability of an outcome is higher than the implied probability from the sportsbook odds. Parlay Builder estimates the true probability using a player’s historical hit rate (with Bayesian shrinkage for small samples) and compares it to the odds. If a prop hits 65% historically but the odds only imply 55%, that gap is your edge.
A hit rate is how often a player has historically exceeded a specific statistical line (for example, over 25.5 points). Parlay Builder calculates hit rates over multiple windows (last 3, 5, 10 games and full season) and by context such as home/away and opponent, so you can see recent form and long-term reliability.
A proposition (prop) bet is a wager on a specific statistic within a game rather than the final result — for example a player’s points, rebounds, assists, strikeouts or passing yards. Props are usually offered as Over/Under markets where you bet whether the stat will go over or under a set line.
A parlay combines multiple bets (legs) into one wager. Every leg must win for the parlay to pay out, and the odds multiply, so the payout is much larger than a single bet — but the probability of winning is lower. Parlay Builder multiplies the individual hit rates and flags correlation so you understand the real win probability before you bet.
A same-game parlay combines multiple bets from a single game, such as a player’s points plus their team to win. Because legs in the same game can be correlated, sportsbooks price SGPs differently. Parlay Builder’s correlation analysis helps you spot legs that move together so you avoid over-paying for correlated outcomes.
American odds are shown relative to $100. Negative odds (e.g. -150) mean you stake $150 to win $100; positive odds (e.g. +130) mean you win $130 on a $100 stake. To convert to implied probability: for negative odds, |odds| / (|odds| + 100); for positive odds, 100 / (odds + 100). So -150 implies 60% and +200 implies 33.3%.
-110 means you bet $110 to win $100 (or $11 to win $10). It is the standard "juice" or "vig" on most point spreads and Over/Under props, and implies about a 52.4% break-even win rate. You need to win more than 52.4% of -110 bets to be profitable.
Parlay Builder supports NBA, NFL, MLB and WNBA with full player and team prop coverage, aggregating odds across DraftKings, FanDuel, BetMGM, Caesars and BetRivers so you can line-shop for the best available price.
Yes. You can browse the full prop board, hit rates and odds for free, and ask the AI assistant 1 question per day at no cost. Paid plans raise the AI limit: Base ($5/month, 10 questions/day), Premium ($14.99/month, 30/day) and Pro ($34.99/month, 150/day).
Use unit-based betting: one unit is typically 1-2% of your total bankroll, so no single loss is catastrophic. Stake full units on strong +EV straight bets and smaller fractions (0.25-0.5 units) on higher-variance parlays. Never chase losses, and only bet money you can afford to lose.
No. Parlay Builder is a research and analytics tool, not a guarantee. It helps you identify statistically favorable (+EV) bets, but all betting involves risk and variance. Bet responsibly, and if gambling stops being fun, call 1-800-GAMBLER for confidential help.