Website intelligence
via API

Technology stack, security headers, DNS infrastructure, and performance data for any domain. One request, structured JSON response.

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What you get per domain

One API call returns structured data across six categories.

Technology Stack

CMS, frontend framework, CDN, analytics, payments, chat, error tracking, tag managers. Detected from headers, cookies, DNS, and HTML.

Security Posture

TLS version, certificate issuer, HSTS, CSP, X-Frame-Options, X-Content-Type-Options, Referrer-Policy, Permissions-Policy.

DNS & Infrastructure

DNS provider, hosting region, MX provider category, SPF/DMARC presence, IPv6 support, SAN domains from TLS certificate.

Performance

TTFB, page size, compression type, HTTP/2 support, redirect chain count, DNS/TCP/TLS timing breakdown.

SEO Signals

robots.txt analysis, sitemap page count, canonical tags, hreflang languages, structured data types, publishing frequency.

AI Crawl Policy

Which AI bots are blocked (GPTBot, CCBot, ChatGPT-User, Google-Extended, Anthropic), crawl-delay settings.

Sample API response

What a single lookup returns.

{
  "domain": "example-saas.com",
  "scanned_at": "2026-03-28T05:00:00Z",
  "tech_stack": ["Next.js", "React", "Cloudflare CDN", "GA4", "Stripe", "Intercom", "Sentry"],
  "security": {
    "tls_version": "1.3",
    "cert_issuer": "lets-encrypt",
    "hsts": true,
    "csp": false,
    "x_frame_options": "DENY",
    "headers_present": 5,
    "headers_total": 6
  },
  "infrastructure": {
    "dns_provider": "cloudflare",
    "cdn": "cloudflare",
    "hosting_country": "US",
    "ipv6": true,
    "mx_provider": "google-workspace",
    "spf": true,
    "dmarc": true
  },
  "performance": {
    "ttfb_ms": 180,
    "page_size_kb": 145,
    "compression": "brotli",
    "http2": true,
    "redirects": 1
  },
  "seo": {
    "robots_txt": true,
    "sitemap_urls": 847,
    "languages": ["en", "es", "fr"],
    "schema_types": ["Organization", "BreadcrumbList", "FAQPage"]
  },
  "ai_policy": {
    "blocks_gptbot": true,
    "blocks_ccbot": false,
    "blocks_anthropic": false
  }
}

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Direct API

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How data is collected

CrawlGraderBot scans public websites and extracts only technical metadata. No personal data. Ever.

Bot crawls

Standard HTTP GET to homepage, robots.txt, and sitemap. Respects robots.txt and crawl-delay.

Signals extracted

Headers, DNS, TLS, HTML meta, and cookie names parsed for technology and infrastructure signals.

Data served via API

Structured JSON returned to API subscribers. No public-facing reports or pages per domain.