What is the ruling on one-sided or third-party wagering (i.e., if you do this, you get a gift, and if you don't, you get nothing)? And what is meant by "compensation," and does it include material, actionable, and verbal benefits (such as stipulating cleaning the house or saying a specific phrase)?

Betting with a prize is permissible only in matters for which there is textual evidence of their permissibility, such as competitions involving horses, camels, and archery. Anything other than these, betting with a prize is forbidden, whether the prize is paid by both competitors, or by one of them, or by an external party, according to the general consensus of scholars. The permissible form is a promise of a gift upon the occurrence of a certain event, and a promise is not legally binding. The prize is not limited to cash, but also includes benefits.