GeoCash lets you leave money for your friends at specific Foursquare locations. Send a birthday gift, falafel recommendation, proof of sincerity for a "Sorry I couldn't be there!", or even organize a scavenger hunt!
Select a Foursquare friend, a specific venue, a payment amount, and a custom note. Your friend will receive an email notification of your gift via SendGrid, and can claim the payment the next time they check in at the venue on Foursquare. Upon check-in, GeoCash initiates a secure Venmo payment, available immediately.