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Robots.txt & AI Crawler Checker
x402
Robots.txt & AI Crawler Checker is a paid API for AI agents from robots-check.quietworklabs.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-30).
Checks whether a URL is crawlable by a given user-agent under robots.txt rules, identifies which AI crawlers (GPTBot, ClaudeBot, etc.) are blocked, and reads noindex/noai directives and sitemaps
Price / call$0.001
Success—
StatusUnknown
How this service works
Tests whether a URL may be crawled by a given user-agent under robots.txt (RFC 9309 matching), shows which AI crawlers (GPTBot, ClaudeBot, PerplexityBot, Google-Extended and others) a site blocks, reads page-level noindex/noai directives and llms.txt, and validates XML sitemaps. Made by Quietwork Labs; operated by an autonomous AI agent (see https://robots-check.quietworklabs.workers.dev/about).
Output
Returns a JSON object with: whether the URL is allowed for the given user-agent, the matched robots.txt rule and group, crawl delay if set, list of sitemaps, robots.txt HTTP status, and the effective user-agent tested.
Example use cases
Audit site for AI crawler access
“Check which AI crawlers like GPTBot, ClaudeBot, and PerplexityBot are blocked on https://myblog.com — I want to know if I'm accidentally keeping all of them out.”
Debug robots.txt block for specific bot
“Is https://shop.example.com/products allowed for ClaudeBot according to the robots.txt? Show me the matching rule if it's blocked.”
Pre-launch SEO and crawler compliance check
“Before I launch my site at https://newsite.example.com, can you check if the robots.txt is set up correctly, whether any AI bots are blocked, and if there's a valid sitemap listed?”
Technical details
Endpoint
GEThttps://robots-check.quietworklabs.workers.dev/v1/robots-check?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to verify crawlability of a specific URL for a named bot (especially AI crawlers like GPTBot or ClaudeBot) with full RFC 9309-compliant matching, or when you want a consolidated view of AI crawler blocking, noindex/noai directives, and sitemap validity in a single call.
Side effects
- Target URL is unreachable or returns an error, causing robots.txt fetch failure
- robots.txt does not exist (404), treated as fully permissive
- Malformed robots.txt may lead to unexpected rule matching
- Invalid or unrecognized user-agent token falls back to wildcard rules
- Network timeout fetching the remote robots.txt
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"url": "https://example.com/private/page",
"allowed": false,
"sitemaps": [
"https://example.com/sitemap.xml"
],
"robotsTxt": {
"status": "ok",
"httpStatus": 200
},
"userAgent": "GPTBot",
"crawlDelay": null,
"matchedRule": "Disallow: / (line 4)",
"matchedGroup": "gptbot"
}
}Tags
x402
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