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Crawl Preflight Check
x402
Crawl Preflight Check is a paid API for AI agents from crawl-preflight.postnov01.workers.dev, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).
Checks a domain before crawling to determine if AI bots are blocked by robots.txt, if content is paywalled, how many pages are crawlable, and whether to proceed or skip.
Price / call$0.02
Success—
StatusUnknown
How this service works
Crawl pre-flight for a domain: will you be blocked, is content behind a paywall, and how much is actually there. Returns per-bot robots.txt verdicts for 16 AI crawlers, crawlable page count from sitemaps, detected CDN and paid-access signals (x402, TollBit), plus a fetch/skip recommendation. Call before spending requests on an unknown domain.
Output
Returns per-bot robots.txt verdicts for 16 AI crawlers (e.g. GPTBot, CCBot), a crawlable page count derived from sitemaps, detected CDN provider, paid-access signals (x402, TollBit), and a clear fetch or skip recommendation.
Example use cases
Pre-crawl access check for AI agent
“Before scraping any content from wsj.com, can you check if that domain allows AI crawlers, whether it's behind a paywall, and roughly how many pages we could actually access?”
Vetting unknown domain before bulk crawl
“I want to crawl a list of domains starting with arxiv.org — first do a preflight check to see if it blocks bots like GPTBot, if there's any paid access barrier, and give me a fetch or skip recommendation.”
Detecting paywall signals before indexing
“Check substack.com before I add it to my indexing pipeline — I need to know if content is behind a paywall like TollBit or x402, how many sitemap pages there are, and what CDN they use.”
Technical details
Endpoint
GEThttps://crawl-preflight.postnov01.workers.dev/crawl-check/:domainWhen to prefer
Use this endpoint when your agent is about to crawl an unknown or untrusted domain and needs to avoid wasting requests on blocked, paywalled, or content-sparse sites. It is especially valuable before bulk crawls, when building web indexing pipelines, or when you need per-bot robots.txt verdicts for specific AI crawlers rather than a generic accessibility check.
Side effects
- Domain does not exist or is unreachable — may return error or empty result
- robots.txt absent — verdicts default to allowed
- Sitemap missing or malformed — crawlable page count may be zero or unreliable
- Rate limiting on the target domain during preflight — partial data returned
- Invalid domain format — request rejected
Tags
x402
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