Buy the cheapest on-chain listing, sell on web2 (eBay) at the last-traded price. Net* is after a ~13% eBay fee; it does not include vault-redemption + shipping (a fixed cost that eats into cheap cards), so treat low-dollar rows with care. Gaps above 50% are filtered — they're usually imperfect web2 matches (wrong variant/grade) rather than real arbs, until Scrydex tightens matching.