A person who assigns a claim for consideration guarantees the existence of the claim and its accessories, unless the assignee acquired it at his own risk or knew of the uncertain nature of the claim.
He is liable for the debtor’s solvency only when he has undertaken to do so, and up to the amount of the price he was able to obtain from the assignment of his claim.
Where the assignor has guaranteed the debtor’s solvency, this guarantee refers only to current solvency; it may, however, extend to solvency at maturity, but on condition that the assignor has expressly specified this.