402utils Robots.txt Compliance Checker

x402

402utils Robots.txt Compliance Checker is a paid API for AI agents from 402utils.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-12).

Checks whether a given URL is allowed or disallowed for a specific crawler bot by fetching and parsing the host's robots.txt per RFC 9309

Price / call$0.001

Seller volume →—

Success—

StatusUnknown

How this service works

Robots.txt compliance check for polite crawlers and AI agents (GPTBot, ClaudeBot, ...). Pass a page URL and optionally your crawler's product token; returns whether the URL may be fetched, the winning Allow/Disallow rule, crawl-delay and sitemap URLs. Full RFC 9309 matching: wildcards, $ anchors, longest-match, merged groups. A 4xx robots.txt allows all; 5xx or unreachable hosts report disallowed. Cached per host for 1 hour.

Output

Returns a JSON object with: allowed (boolean), matchedRule (the winning Allow/Disallow directive as written), crawlDelay (seconds from the matched group), sitemaps (array of sitemap URLs declared in robots.txt), robotsUrl (URL of the fetched robots.txt), robotsStatus (HTTP status of the robots.txt response, 0 if unreachable). A 4xx robots.txt status means all crawling is allowed; 5xx or unreachable means disallowed per RFC 9309.

Example use cases

Verify AI crawler access compliance

“I need to crawl a bunch of product pages for our research. Can you check if ClaudeBot is allowed on each domain's robots.txt before we start?”

Discover sitemaps and crawl rules

“We're building a search index for academic papers. Can you look up the robots.txt for these research repository sites and tell me what sitemaps they publish plus the crawl-delay rules?”

Batch scraping with bot permission checks

“Before we scrape competitor pricing data from these e-commerce sites, can you verify which ones actually allow our crawler bot according to their robots.txt rules?”

Technical details

Endpoint

GEThttps://402utils.com/v1/robots-check?utm_source=zero.xyz

When to prefer

Use this endpoint when an AI agent or crawler needs to verify RFC 9309-compliant robots.txt access rules before fetching a URL, especially when you need wildcard/anchor matching, longest-match resolution, crawl-delay extraction, and sitemap discovery all in one call. Prefer over manual robots.txt parsing when you need full RFC 9309 compliance including merged groups, $ anchors, and proper 4xx/5xx fallback behavior. Cached per host for 1 hour, making it efficient for batches of URLs on the same domain.

Side effects

Host unreachable — robotsStatus is 0, allowed is false per RFC 9309
robots.txt returns 5xx — allowed is false per RFC 9309
robots.txt returns 4xx — allowed is true (permissive fallback)
Invalid or malformed URL input — likely 4xx API error
Robots.txt cache miss causes slight latency increase on first fetch per host

Input

Schema · Request body

Field	Type	Description
inputrequired	object
output	object

Output

Schema · Response

{
  "type": "json",
  "example": {
    "url": "https://example.com/search?q=demo",
    "allowed": false,
    "sitemaps": [
      "https://example.com/sitemap.xml"
    ],
    "robotsUrl": "https://example.com/robots.txt",
    "userAgent": "GPTBot",
    "matchedRule": "Disallow: /search",
    "robotsStatus": 200
  }
}

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