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402registry audits a website the way an AI crawler sees it. One GET to https://402registry.com/buy/one?site=https://example.com answers 402 with the price; a signed USDC payment on Base through x402 ($0.10 per check, no account, no API key, no card) runs the check and returns the report. The check fetches the site without JavaScript with a self-identifying bot user agent, then probes the edge with the real signatures of OAI-SearchBot, PerplexityBot, GPTBot and ClaudeBot, and reads robots.txt, llms.txt, the sitemap, canonical, JSON-LD and Open Graph, the www and apex hosts, HTTPS, and a soft-404 probe. Every finding comes with evidence and a fix for the detected stack (Next.js, Nuxt, Astro, Lovable and others), plus a model verdict with a category and a one-paragraph description. A site that passes gets a dated badge and a free listing in the public catalog at https://402registry.com/registry, re-checked for free every 30 days; a site that does not pass gets the full report and nothing is published. The catalog's basic fields are free as JSON; the full snapshot with every finding is $0.05. Payment requirements and the receiving address are published at https://402registry.com/trust; free machine docs at /.well-known/402registry.json, /openapi.json and /llms.txt. Limits: 3 checks per site per hour, 10 per day.

402registry: is your website visible to AI crawlers? Audit for $0.10 with x402

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