On-chain data platform Arkham evaluates Polymarket traders by prediction accuracy.

Arkham has introduced an Elo-based rating system for Polymarket traders that scores prediction accuracy rather than bet size, awarding higher points for correctly forecasting low-probability outcomes. The on-chain data platform said the top-ranked trader, roberto73, holds an Elo score of 2,489 across 3,245 bets with a 49.7% win rate. The move adds a skill-weighted metric to complement conventional profit-and-loss tracking on the Polymarket prediction market. It matters because accuracy-based scoring could give traders and observers a clearer read on forecasting ability than raw volume or wager size alone. What to watch next is whether Arkham expands the leaderboard and whether other prediction markets adopt similar Elo-style ratings.