This seems similar to what PayPal was doing in 2002. Its possible or even likely that PayPal's techniques have become stale over time, but they were doing some very advanced fraud detection in their time[1][2].
A really interesting book that detailed how the development of PayPals anti-fraud system came about (among other things) is Founders at Work[3].
[1] http://www.businessweek.com/stories/2002-09-30/max-levchin-o...
[2] http://www.quora.com/What-were-the-early-achievements-that-d...