SingleFeed now supports bid management or a bid column in your feed. You can still manage bids through your shopping engine accounts, but now you can also submit engine specific bids at the product level in your data feed. You can review SingleFeed's Supported Fields for more information.
Products that are delivered by SingleFeed without a bid set in the data feed will have whatever the current or default bid amount is for that product or category the item is located in. If you have brand new shopping engine accounts, many of them require you to set or activate bids for your products/categories before your items will go live.