Flexa, a payments start-up, partnered with major cryptocurrency exchange Gemini to create a cryptocurrency payments app, Spedn. Spedn works by piggy-backing on the digital scanners that many big retailers use to accept phone-based payments from their apps and from digital wallets like Apple Pay.

Flexa has reached deals with major retailers including Crate and Barrel, Nordstrom, and Amazon-owned Whole Foods to accept payments through the Spedn app.

The integration of the Spedn app with these major retailers have been quiet, and this is by design. According to this Fortune article, the companies involved are treating this as an experiment. The appeal of Spedn for these companies is the potential to lower fees they pay to existing payment networks.