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Webscan AI Website Preflight
x402
Webscan AI Website Preflight is a paid API for AI agents from api.webscan-ai.online, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).
Performs deterministic, multi-dimensional website intelligence analysis on a public URL, returning DNS, TLS, security headers, redirect chains, robots/sitemaps, HTML metadata, technologies, and bot-detection signals as structured JSON.
Price / call$0.02
Success—
StatusUnknown
How this service works
Website reconnaissance for AI agents: DNS/TLS, redirects, access paths, bot/JavaScript detection, metadata, technologies, security headers, robots, sitemaps and API discovery, with timestamps and content hashes. Plan crawling, integrations and technical audits from one request. Guide & examples: https://api.webscan-ai.online/guide/
Output
A JSON object covering: DNS records and resolution, TLS certificate validity and chain details, HTTP redirect hops, compression methods supported, security headers present (HSTS, CSP, X-Frame-Options, etc.), robots.txt and sitemap contents and URLs, llms.txt presence, OpenAPI spec discovery, HTML title/meta/Open Graph tags, JSON-LD structured data, detected technology stack, bot and JavaScript detection signals, accessible URL paths, content hashes, and explicit capability limitations. All results are deterministic with no LLM inference involved.
Example use cases
Pre-scrape website compatibility check
“Before I try to scrape data from https://shop.acme.com, can you do a preflight scan to check if it blocks bots, requires JavaScript, has any tricky redirects, and what its robots.txt says? Use a 1-hour freshness window.”
Security posture audit for a vendor
“I need to quickly assess the security posture of https://vendor-portal.io — check their TLS certificate, DNS setup, and whether they have proper security headers like HSTS, CSP, and X-Frame-Options set.”
AI-readiness discovery for a website
“Does https://docs.myservice.dev expose an llms.txt file, an OpenAPI spec, or any JSON-LD structured data? Run a preflight check on it so I know how agent-friendly it is.”
Technical details
Endpoint
POSThttps://api.webscan-ai.online/v1/website-preflightWhen to prefer
Use this endpoint when an AI agent needs a structured, deterministic snapshot of a website's technical properties before interacting with, scraping, or integrating it — especially when you need security header audits, bot-detection awareness, llms.txt/OpenAPI discovery, or DNS/TLS verification without invoking an LLM. Prefer it over general web scrapers when you need structured intelligence rather than raw page content, and over manual curl/dig checks when you need all signals in one consolidated JSON response.
Side effects
- URL is not publicly reachable — returns error with DNS or connection failure detail
- Invalid or non-HTTP(S) URL format — schema validation error before request is sent
- Site returns non-200 status or blocks the scanner — partial results returned with noted access failures
- freshness_seconds of 0 forces a fresh fetch which may time out on slow sites
- TLS certificate is invalid or expired — flagged in response but scan may still complete partially
- Site uses heavy JS rendering — JS-dependent content will be flagged as unresolved
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| url | string | Public HTTP(S) website URL to inspect |
| freshness_seconds | integer |
Tags
x402
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