ETH lands in your Duel balance after about a minute of network finality, and withdrawals leave as soon as you hit the button — Duel processes them instantly and charges nothing on top. Gas is the only real cost: mainnet fees fluctuate, so for small $5–$20 sessions a cheaper rail like USDC on Polygon keeps more of your bankroll in play. For DeFi-native players who already hold ETH, it's the most convenient bridge into Duel's provably fair Originals.