It's called Who Paid More (https://whopaidmore.com) and the idea is pretty frivolous. Every day (EDT) you volunteer an amount you want to pay to see how your amount stacks up against others for that day. Think ranking and relative % across users for that period and the ability to share those results. Not much more to it at the moment.
I feel a little stuck trying to think of what would make it more fun/novel/rewarding besides just being curious about what people put money into.
