Launched in the Startup Battlefield at TechCrunch Disrupt NY 2015, Paribus’ idea was to automate the process of following up on past purchases to see if shoppers could request a refund from the online retailer. Many retailers offer post-purchase price matches, but most consumers don’t bother to watch the prices fluctuate after they complete the checkout process. Paribus instead integrates with your email provider – like Gmail, Outlook, or Yahoo, for example – in order to scan your inbox for receipts of online purchases. When it finds one, it will then watch the item for a price drop within the store’s price match claim window. The service works with a number of online retailers, including Amazon, Best Buy, Walmart, Target, Bloomingdale’s, Macy’s, Bonobos, J.Crew, NewEgg, Costco, Staples, Kohl’s, and many others.

https://techcrunch.com/2016/10/06/capital-one-acquires-online-price-tracker-paribus/