Financial firms selected loan sale advisor DebtX to sell off $650 million in performing and non-performing loans during the fourth-quarter of 2012.

The biggest transaction comes from a single U.S-based financial firm which charged DebtX with offloading a $250 million portfolio.

In addition, dozens of other sellers are using the platform to offload various commercial real estate, industrial and consumer loans through Dec. 14.

Investors can access bidding and due diligence materials through the company's website.

The large $250 million loan pool for sale includes some residential loans that were previously modified using the government's Home Affordable Modification Program.

About $27.5 million of the performing and non-performing loans in the DebtX sale are tied to residential and luxury-home loans on U.S. properties.