If you're building a Polymarket trading bot, don't copy the risk logic from a casino or RNG betting bot. It's a category error that will bite you the first time a market gets volatile.
The short version: casino odds are exogenous and fixed. Polymarket odds are endogenous and reflexive - your own order can move the price you're trying to predict. That changes what "risk" even means.
Casino RNG risk model (what most bot tutorials teach)
risk = f(bankroll, known_probability, variance)
Kelly criterion, fixed stop-losses, and volatility smoothing all assume a known, stable probability distribution. That assumption holds for roulette. It does not hold for Polymarket.
Why that model breaks on Polymarket
No stable ground-truth distribution - prices shift the instant new information lands (news, on-chain signals, polls). A static-distribution risk model misprices tail risk immediately.
Adverse selection - you can get picked off by a counterparty with a faster or better information edge. No RNG-based model accounts for this.
Market impact and slippage - casino games have no order book; Polymarket does. A large order on a thin contract can move price 5 to 10 percent or more.
Correlated exposure - Polymarket positions often cluster around related real-world events like elections or macro releases, so per-market variance limits miss portfolio-level risk.
A better risk model, roughly
risk = f(order_book_depth, info_event_triggers, order_flow_signal, correlated_market_caps, tail_weighting)
Where order_book_depth drives market-impact-aware sizing, info_event_triggers handle dynamic re-pricing on news, order_flow_signal flags possible adverse selection, correlated_market_caps limit exposure across linked markets, and tail_weighting accounts for the fact that binary payoffs need asymmetric downside protection.
Concretely: before sizing a position, check depth-at-price on the order book instead of just applying a flat percentage of bankroll. Flag abnormal directional flow as a possible informed counterparty. Cap aggregate exposure across markets tied to the same underlying event.
Takeaway
A casino bot manages variance against a known distribution. A Polymarket bot manages exposure in a live, reflexive, information-driven market. If your risk logic doesn't start from market microstructure and information asymmetry, it's not really risk logic for this market - it's risk logic for a different one.
For more deep knowledge please take a look at Github
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