Note: Crabmeat can be purchased in three forms: canned, frozen or pasteurized. The pasteurized usually has the best flavor (it is heated to a lower temperature than canned); look for it in the fresh seafood section of the market. Once opened, the crabmeat should be used within 4 days.
Preheat oven to 450°F. Coat a baking sheet with cooking spray.
Heat 1 teaspoon oil in a large nonstick skillet over medium-high heat. Add corn, onion, curry powder and garlic; cook, stirring often, until vegetables are soft, about 5 minutes. Transfer mixture to a large bowl and let cool completely. Stir in crabmeat.
Whisk mayonnaise, egg whites, lime juice, cilantro, mint and salt in a small bowl. Fold into the crab mixture. Stir in 1/2 cup breadcrumbs. Using about 1/3 cup per patty, form the mixture into eight 3/4-inch-thick patties. Dredge the patties in the remaining breadcrumbs.
Heat 2 teaspoons oil in a large nonstick skillet over medium heat. Add 4 crab cakes and cook until the undersides are golden, 2 to 3 minutes. Using a wide spatula, turn cakes over onto the prepared baking sheet. Add the remaining 2 teaspoons oil to the skillet and repeat with the remaining 4 crab cakes. e the crab cakes until golden on the second side and heated through, 15 to 20 minutes. Serve with lime wedges.