Two volatile fintechs, both of which show promise, are Marqeta (NASDAQ: MQ) and Bill.com (NYSE: BILL). It has pretty much been nothing but a miss for Marqeta investors since the company went public in June of 2021 with the stock getting crushed the past two years, while Bill.com has had its share of ups and downs since it went public in December of 2019. Marqeta resides in the payments segment of the fintech industry.