Hey Product Hunt 👋 I've been building AI-powered applications and kept running into the same complaint from other builders - token costs burning through budgets faster than expected. A lot of it traced back to fake signups farming free tiers. I started thinking about replacing captchas entirely with something smarter. That turned into an idea for layered email validation. I built the first version, tested it against 150k real emails, found patterns I'd missed, added more layers, tested again. Kept going until I had 30+ distinct signals scoring each email submission. At 95% I added two more layers. Hit 99% fraudulent email detection. No captchas. Just clean signups. Then I built SDKs and APIs so it drops into any signup flow in minutes. Research with early builders confirmed up to 41% of signups on AI products use burner or disposable emails. Every fake account burns real tokens. For email lists you're literally paying to message addresses that will never convert. Which is why I also just shipped a bulk list cleaner. Upload your existing mailing list and it rapidly processes every address and flags the bad ones. Everyone gets one free scan. Paid users can process lists up to 250k addresses as part of their subscription. BigShield stops the problem at the door and cleans up what's already there. Generous free tier to get started - and Product Hunt users get 50% more free validations this month. Happy to answer anything. Built this because I needed it myself and I think a lot of you may as well.

BigShield.app

Stop fake signups from draining your AI budget

Stop fake signups from draining your AI budget