Show HN: Duckity – Abuse protection for the AI agent era

Duckity is an abuse-protection service for app APIs that combines rate limiting, network signals, and VDF-backed computational challenges without prompting users with visual or auditory puzzles. It processes only client IPs and requests, stores and processes data in Frankfurt, Germany, and offers SDKs for web and native platforms, with a free tier of 10,000 challenges per month and a Pro tier at $49/month for 100,000 challenges.