PredictOdds Pro is an independent, 100% ad-free prediction market tool. Tips help fund automated cross-exchange arbitrage scrapers and new feature development!
ð Pro Roadmap in Development:
⢠Live Real-Time Kalshi & Polymarket Webhook Feeds
⢠Automated Mispricing & Cross-Arb Alerts
⢠Dynamic Multi-Outcome Bracket Sizers
Event Contract
Fed 25 bps Cut
Market Implied Odds
62.0% (62¢)
User Assessed Prob
75.0%
Expected Value (EV)
+$0.13 / contract
Expected ROI
+21.0%
Kelly Bet Size
34.2% Bankroll
âï¸ Contract ParametersKalshi / Binary Rules
ð§ Your Estimated Probability:75% True Probability
1% Impossible50% Toss-Up99% Certain
ð¡ Mathematical Edge Insight
Positive Edge (+13.0%): Market is pricing this outcome at 62¢ (62%), but your assessed true probability is 75%. Buying YES offers a statistically favorable risk-reward profile.
Shows your expected net dollar profit/loss per 100 contracts across different true outcome probabilities ($1.00 payout on win, $0.00 on loss).
Full Kelly Size
34.2% ($342)
Half Kelly (Recommended)
17.1% ($171)
Quarter Kelly (Safe)
8.5% ($85)
Kelly Criterion Formula: $f^* = \frac{b \cdot p - q}{b}$
⢠$p$ = True probability of winning
⢠$q = 1 - p$ = Probability of losing
⢠$b$ = Net payout odds = $(1.00 - \text{Price}) / \text{Price}$ Half-Kelly is the institutional gold standard to prevent risk-of-ruin while compounding edge over multiple independent events.
Market Source
YES Price
NO Price
Combined Sum
Arbitrage Opportunity
Kalshi Event
$0.62 (62¢)
$0.39 (39¢)
$1.01 (101¢)
-1.0% (Taker Fee Spread)
Polymarket Web3
$0.58 (58¢)
$0.42 (42¢)
$1.00 (100¢)
Parity Balanced
Cross-Market Spread
Buy Poly (58¢)
Buy Kalshi NO (39¢)
$0.97 (97¢)
+3.0% Guaranteed Arb
When the sum of Best YES and Best NO across two prediction venues is strictly under $1.00, an atomic risk-free spread exists.