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Is your site blocking AI crawlers?

Paste your URL or robots.txt and see exactly which AI bots can access your infrastructure — and which are stopped cold.

Find your robots.txt at: https://yourdomain.com/robots.txt

We'll fetch robots.txt from https://yourdomain.com/robots.txt via a public CORS proxy.

Want real-time AI crawler cost alerts?

  • Per-bot cost attribution (GPTBot, ClaudeBot, meta-externalagent…)
  • Instant alerts when a crawler spikes your bill
  • One-click rate-limit rules — no Nginx config required

Common questions

Why do AI crawlers spike infrastructure costs?

Unlike Googlebot (which respects crawl delays and caches well), AI training crawlers often make rapid parallel requests, bypass CDN caches, and hit database-backed pages. A single MetaExternalAgent burst has been reported to cause 5–10× temporary traffic spikes with no warning.

Does blocking AI crawlers in robots.txt actually stop them?

Major crawlers like GPTBot (OpenAI) and ClaudeBot (Anthropic) officially claim to respect robots.txt. Enforcement varies — this is a best-effort signal, not a firewall rule. Rate-limiting at the infrastructure level (Cloudflare, nginx) provides stronger guarantees.

Which AI crawlers are most likely to spike my bill?

Reports in 2025–2026 most commonly cite Meta-ExternalAgent, GPTBot, Bytespider (ByteDance), and CCBot (Common Crawl). Newer LLM services have also started operating undisclosed crawlers. See the full user agent reference →

I'm already blocking them in robots.txt. Am I fully protected?

Not necessarily. robots.txt only works for crawlers that choose to honor it. For cost protection, you also want real-time monitoring to know when a crawler is hitting your site and how much it's actually costing — so you can respond before the invoice arrives.

📊 We checked 20 popular developer platforms — most aren't blocking AI crawlers correctly →