Site audit APIs.
100 free calls/day, no signup.
The same data behind SiteTrace's free browser tools, exposed as REST + JSON. SEO audit, AI content detection, email validation, schema detection, HTTP headers, and more — at a fraction of what Ahrefs / SEMrush / Hunter charge.
No credit card. No tracking. Edge-cached. Same data, no markup.
5 core site audit APIs
Live now at api.sitetrace.it.com
SEO Audit
Title, meta, headings, images, links, schema, OG, score (0-100).
GET /api/seo-audit?url=...
AI Content Detector
5 statistical heuristics. Pure JS, no LLM cost. Burstiness + TTR + AI-phrases.
POST /api/ai-content-detector
Email Health
Syntax + MX (DoH) + disposable + role + deliverability score. 1 or batch.
POST /api/email-health
Schema Detector
JSON-LD + Microdata parser. Rich-result eligibility scoring.
GET /api/schema-detector?url=...
HTTP Headers Audit
8 security headers scored A-F. CSP, HSTS, X-Frame-Options analysis.
GET /api/headers?url=...
5 bonus recon APIs
Shipping over the next 2 weeks — free forever, all $0 infrastructure.
RDAP / WHOIS Lookup
Domain registration, dates, nameservers. Free via rdap.org.
GET /api/rdap?domain=...
Redirect Chain Tracer
Follow all redirects, detect broken chains, mixed http/https.
GET /api/redirect-trace?url=...
Bulk HTTP Status Checker
Up to 100 URLs per call. Broken link monitoring at scale.
POST /api/status-check
Subdomain Enumerator
All known subdomains via crt.sh certificate transparency logs.
GET /api/subdomains?domain=...
Wayback Machine Snapshot
Historical versions of any URL via Internet Archive CDX API.
GET /api/wayback?url=...
Why is the infrastructure so cheap?
Everything runs on the Cloudflare Workers free tier + free public datasets. We don't pay for Ahrefs backlink data, paid SMTP relay, or premium DNSBLs. Edge caching means repeat URLs return in <50ms with no upstream call.
Quickstart
# Free tier — no signup, IP rate-limited curl 'https://api.sitetrace.it.com/api/seo-audit?url=https://example.com' # Paid tier — get your API key at api.sitetrace.it.com/signup curl -X POST 'https://api.sitetrace.it.com/api/ai-content-detector' \ -H 'Authorization: Bearer YOUR_KEY' \ -H 'Content-Type: application/json' \ -d '{"text":"your text here"}' # No signup for free tier. Sample 100 calls/day per IP.
Ship in 5 minutes
Free tier is enough to evaluate. Hobby at $9.99/mo unlocks 1,000 calls/day and removes the rate limit. No annual contracts, no minimums.
Get started free →