My next site is one that lets people who use any one of 160+ mobile phone carriers pay their bills or recharge their prepaid phones with Bitcoin. I've already found a company that does most of the heavy lifting and has already secured the agreements with the right parties.

They don't have an API, but they do have a standard template I can email them to have them perform the action and they offer net-30 billing.

This will allow me to ask for people's phone numbers, select their carrier, and send me Bitcoin. Then I send the order to the fulfillment company who loads up the users phone account and I pay them at the end of the month.

I'm excited by it because everyone talks about how Bitcoin is good for the remittance market, but there needs to be a use for Bitcoin in the developing world for people to use it if they don't have access to an exchange and a bank account.