The team started with incentives for providing any parking info at all. Then they assigned value to parking spots according to likely demand. A spot in Manhattan during rush hour would be worth more than a spot at a suburban mall on a weekend, for instance. The more intrinsically valuable the spot, the more money someone can earn by providing information about it. Finally, information providers will also get a bonus if someone actually parks in the available spot. It's not totally clear how the money would be exchanged, but NewSci says payment could work through something like Facebook credits, wherein people pay real money for virtual credits that can be used to purchase services. It could also conceivably work through PayPal.