On free shipping items, none, it is the honor system. If a person charges for shipping and only takes PayPal, then you are covered under PayPal protection plan. If you bid on an item, winn, and you don't get your gift, Listia has a fourm you go through to get your credits back. Myself, I only use paypal 'cause it protects both seller and buyer...Plus you get a tracking number from the USPS so you can track your item. T.J.