For Insightful Investigator, is the 2 XP cost paid before seeing the opponent's hand?

Core Rules 383.3.b say triggered-ability costs must be paid to finalize the ability onto the chain. For Insightful Investigator, must the 2 XP be spent before the opponent's hand is revealed?

For Insightful Investigator, is the 2 XP cost paid before seeing the opponent's hand?