The US-only app predicts a user’s “7 Day Low”, aka the lowest it thinks your bank balance will drop in the next seven days, in order to encourage and support better money management. The ultimate aim being to help people avoid having to fall back on their overdraft as “an expensive form of credit”, says co-founder Jason Wilk, describing it as a sort of “weather forecast” for money management. Dave also includes a payday loan facility — so users who face the inevitability of having to dip into a negative balance can opt to borrow up to $250 ahead of their next paycheck to see them through. But unlike payday loan companies (such as Wonga), which also offer a short term borrowing facility to mobile users but typically charge very high rates of interest, Dave’s payday loans are 0% interest.

https://techcrunch.com/2017/04/25/dave-wants-to-save-you-from-expensive-overdraft-fees/