Has anyone used this "sell my car program" at Nerdwallet ? I am shopping online services to sell my car and am familiar with Autotrader, eBay, KBB, etc. I want to make certain that using Nerdwallet is 100% safe. I submitted the details on my car for a valuation and received an offer to buy - however, I cannot find any links on Nerdwallet about how this service works or security of the transaction. Please help.