Hacks to acquire users for your SaaS prototype, leverage targeted marketing strategies such as offering free trials, beta access, or exclusive early adopter discounts. Utilize content marketing, social media platforms, and online communities to generate buzz and attract potential users. Partner with influencers, offer referral incentives, and participate in industry events to expand your reach and drive user acquisition. Additionally, focus on providing exceptional user experience and gathering feedback to iterate and improve your prototype, ultimately attracting more users through word-of-mouth and positive reviews.