I shipped an x402 AI-crawler paywall in 3 hours on Vercel's free tier

Last night I shipped a working x402 AI-crawler paywall in 3 hours, on $0, with nothing but Next.js 16 + Vercel's hobby tier + a fresh Base keypair I generated on disk. The gated endpoint is live at https://cipher-x402.vercel.app/premium/mev-deep-dive...