Sports Betting and Prediction Markets—Through a Trading Lens · Stefan Stadie

Host Transition Announcement

• Tessa Dow and Ian Cox are concluding their tenure as hosts of "Chat with Traders" after years of producing the show.
• The podcast will continue with a new host for the next episode, while Tessa focuses on her own trading activities at tessadao.com.

Stephan Stady's Trading Background & Evolution

• Origin: Began in Calgary, Canada, working in oil and gas (pipeline scheduling) before transitioning to full-time swing trading in 2019.
• Early Strategy: Initially focused on long-biased swing trading; notably profited from 2018/2019 biotech rebounds and IPOs.
• Key Pivot (Short Selling): Shifted to short-selling in late 2020 to exploit "trappy" long-market moves; now relies on relative volume and liquidity exhaustion rather than anticipation.
• Risk Management Evolution: Moved away from fixed percentage sizing (e.g., 10% of account) to reverse-calculated risk based on chart levels and stop-loss placement.
• Learning Sources: Heavily relied on YouTube (specifically Nate from Investors Underground) and forex channels before settling on stock trading.
• Current Direction: Currently holds a long-term swing position in crude oil following the Iran war escalation, though previously shorted the post-bombing sell-off.

Sports Trading & Arbitrage Strategy

• Market Entry: Entered sports betting via sign-up bonuses but quickly identified mispricing opportunities (arbitrage and EV+ strategies).
• Tactics: Utilized real-time scanners (OddsJam, OddsGem) to find discrepancies between "soft" books and liquid markets, then hedged or arbitrage the difference.
• Liquidity Timing: Targets high-liquidity windows near event start times (similar to market open/close) to execute trades before price corrections.
• Scale & Volume: Previously managed 20+ open tabs across multiple sportsbooks simultaneously; maxed out liquidity limits on mispriced legs.
• Returns: Reported annual returns of at least 100% during peak arbitrage periods due to high turnover and compounding edges.
• Restrictions: Was limited or banned by over 20 retail sportsbooks (e.g., Bet365, FanDuel) for taking risk-free profits.

Shift to Prediction Markets & Market Making

• Platform Switch: Moved to Pinnacle (sharp book) and peer-to-peer platforms like Polymarket and BetOpenly to avoid bans.
• Market Structure: Now acts as a market maker, setting spreads outside of sharp reference lines (e.g., Pinnacle) to capture the bid-ask spread.
• Target Margins: Aims for minimum 3% gross margins per round trip, ideally 5-10%, accounting for 1-2% exchange fees.
• Daily Volume: Executes approximately 25 directional positions daily; active in 25+ different markets per day across NBA, NHL, and other sports.
• Product Innovation: Avoids "parlays" (negative EV for traders) but profits by selling parlay products to the public at juiced odds.

Market Dynamics & Truth Discovery

• Price Discovery: Prices in prediction markets shift from model-driven "soft lines" to true probability as liquidity and participant volume increase.
• Liquidity Correlation: Higher liquidity correlates with greater market accuracy ("wisdom of the crowd"), whereas low liquidity leads to wider spreads and slippage.
• Efficiency Gap: Sports and prediction markets are described as "infancy" compared to financial markets, offering significantly more edge due to fragmentation.
• Resolution Risks: Highlights the danger of unregulated markets where contract resolution language (e.g., Polymarket's "aliens" or "Jesus" markets) can lead to unexpected losses.
• User Statistics: Cites data suggesting ~70% of Polymarket users realize losses by late 2025, with only 30% in profit.

Psychological & Operational Discipline

• Variance Management: Identifies short-term variance and psychology as the primary struggles; emphasizes process over single-day results.
• Focus Strategy: Avoids trading during live, wild price movements; prefers intermissions or pre-game/half-time for market making to avoid being "sniped."
• Multi-Market Management: Capable of trading from an airplane with Wi-Fi; maintains a multi-screen setup tracking Pinnacle, DraftKings, and Polymarket simultaneously.
• Advice for Novices: Recommends starting small to account for deposit fees, tracking all performance, and verifying if a genuine edge exists before scaling.

Future Outlook

• Industry Growth: Predicts the prediction market sector will reach a $1 trillion valuation by 2030, viewing the current boom as a permanent structural shift.
• Regulation Concerns: Warns that increased liquidity does not eliminate insider trading risks, particularly in unregulated crypto-native markets.
• Gamification: Notes that reduced friction (mobile apps) lowers the barrier to entry, potentially turning sports betting into a "drug-like" habit for the public.
• Contact: Stephan Stady is active on X (Twitter) under the handle @bronzebeard22.