The Money 20/20 Hackathon had 50% of the 104 participating developers submit projects built on Bitcoin APIs like Blockchain's who helped sponsor the event along with old school players like PayPal, Mastercard, and Inuit.
BitPredict captured a $20,000 grand prize; the application was developed by two students from Texas A&M. This application manages bitcoin volatility with statistics that uses data from Blockchain.info. These statistics are used in conjunction with Google’s prediction engine to create a 90-95% accurate prize prediction of Bitcoin. A user is able to send and receive with the Blockchain API and set a risk level, which will automatically adjust the account balance of bitcoin and USD depending on the risk level.
http://blog.blockchain.com/2014/11/04/our-weekend-at-the-money2020-hackathon/