[Arkham Introduces Elo Rating System to Evaluate Polymarket Traders' Predictive Accuracy] Arkham has introduced the Elo rating system to evaluate Polymarket traders. The rating is based on predictive accuracy rather than betting size, with higher scores awarded for successfully predicting low-probability events. Currently, the highest-rated trader is roberto73, with an Elo score of 2489 and a win rate of 49.7% across 3245 bets.