Alibaba-owned Vendio has acquired SingleFeed, a startup that helps online merchants to submit, manage, and optimize product listings on sites like Google Product Search, PriceGrabber and others. Terms of the deal were not disclosed. SingleFeed takes an online merchant’s products and delivers this data to comparison shopping engines. The virtue of SingleFeed’s service is that it helps merchants improve engagement, visits and transactions by being listed on more engines. As Vendio says, comparison shopping engines can drive between 15 and 40% of an online store’s monthly visits.