when a price drops, paribus gets you the difference and keeps 25%. currently it supports purchases from 18 major retailers. and how do i know that paribus is not reading e-mails from my health insurance or my accountant? >> we just work with a select number of stores. only those stores, those receipts. >> reporter: to be extra safe, you can also set up an e-mail account just for online shopping. >> reporter: and you never see my credit card number? >> that's right. >> reporter: as for the rojos, they're stashing their savings for a very good cause. >> college for sophia so she can go get her education. >> reporter: six months ago, dave collier ditched his job in the sagging oil industry and signed up for computer coding school. >> apps to be built and people who can do that are going to be valuable. >> reporter: but the tuition put him $16,000 deeper in december. he had $50,000 in loans and needed to refinance fast. that's when he found upstart. >> i was able to consolidate $22,000 worth of credit card debt, cut my rate in half, and accelerate my tim