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Arkham Introduces Elo Rankings for Prediction Market Traders, Crowning "GardenerCx" at the Top

6/29/2026

Arkham has launched a ranking system for prediction market traders, using Elo scoring to sort participants by performance rather than volume or nominal profit.

The new leaderboard puts a trader known as "GardenerCx" at the top, on the strength of a 64.3% win rate recorded across 2,644 bets concentrated in up/down bitcoin markets.

What the Elo System Actually Measures Elo scoring, borrowed originally from competitive chess, adjusts a player's rating based on the implied difficulty of each outcome — a correct call against a heavily favored result moves the score more than a call against long odds.

Applied to prediction markets, that framework shifts the comparison away from who made money and toward who called markets correctly, and how consistently.

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