Direct online buy and sell exposes a lot of risk. The web is full of scammers and there is a need for buyser's and seller's security. I am working on a prototype for an escrow service that covers direct online buy and sell transactions (for example via craigslist or any online classified ads site). The idea is to be the middle man on the transaction. Verify the identity of both parties, hold the cash involved, monitor the transaction then disburse the cash to the seller when everything is good. It is easy to expand the idea beyond this concept in the future.
I am looking for a co-founder possibly has worked with this kind of service before. Preferably has a previous experience with early stage start-ups and gaining funds.