Soak cashews in room temperature water for 2 hours (or in very hot water for 20-30 minutes if short on time).
In a food processor, pulse graham crackers until they form a fine crumb mixture. Add melted butter and agave, pulsing until the mixture comes together.
Press the crust firmly into the bottom of a 9" springform pan. Chill in the freezer while you prepare the filling.
Drain cashews and blend with remaining filling ingredients until smooth and creamy. This may require multiple blend cycles; scrape down the sides to ensure thorough mixing.
Pour the filling over the crust and return to the freezer for 3-4 hours, or until completely set. Allow it to sit for 10 minutes before topping with fresh fruit and slicing. Store leftovers in the refrigerator for a softer texture or the freezer for a firmer one.