Luke – that question is harder to answer than it seems it should be. The problem is that I don’t really think the prosper credit score system is in any way comparable to the analysis a bank or lending company would do so I don’t believe comparisons would be valid.

It also depends on where you want to look on the curve. For A and AA my gut is that prosper rates are higher than market. For B loans – 14% for a $6000 unsecured loan seem about market but again would really depend on more data about the borrower. D and E loans in the low 20s may be a good deal for prosper borrowers.

As a lender calculating rates is an even bigger problem since the default rates in prosper will likely be higher than traditional lending.