Series A · Fintech · Paris, France · Founded 2021 · 11–50 employees
Bitstack is a Paris-based fintech startup founded in 2021, offering a mobile application that enables users to save and invest in Bitcoin effortlessly by rounding up everyday purchases to the nearest euro and converting the spare change into Bitcoin. With over 300,000 active users and more than €300 million saved in Bitcoin, Bitstack has experienced significant growth, including a tenfold increase in revenue over two years. The company secured a €15 million Series A funding round in December 2025, led by 13books Capital, to accelerate its European expansion and enhance its product offerings, such as introducing a Visa debit card with Bitcoin "stackback" rewards and a euro account with a French IBAN.