PROMPT x PURCHASE is a one-day hackathon in Berlin where participants build AI agents capable of searching, purchasing, and paying for real products on Bitrefill. The event takes place June 17 at Mena Berlin, starting with a brunch kickoff at 11 AM and running through the evening. Participants can work solo or in teams to create autonomous agents that handle transactions end-to-end, from gift-giving bots to eSIM top-up services. Bitrefill mentors will be on-site, and participants have special access to demo without spending real money. The top three submissions win EUR 500, EUR 300, and EUR 200 in Bitrefill gift cards respectively, while the top five builds receive job interview opportunities and project spotlights on Bitrefill’s main account.