Bitsie is offering the app for free, and with up to 25 free transactions per month, along with the founders' expertise in an effort to get retailers to take on the risk of accepting bitcoin. Eventually, the entrepreneurs plan to charge a flat monthly fee for transactions beyond that. They are seeking out business owners in tech-savvy neighborhoods like Harbor East and Hampden, hoping that getting it into locally owned shops will raise awareness among their Millennial and Gen-X customers. Bitsie also is organizing a bitcoin seminar for business owners and entrepreneurs at the technology incubator Betamore on July 17.