DetectZeStack – REST API to detect any website's technology stack

Hi HN,I built DetectZeStack, a REST API that identifies the technologies behind any website. What it does: Give it a URL, get back a list of frameworks, CMS platforms, CDNs, analytics tools, and more — with confidence scores and metadata for each technology. How detection works: • Wappalyzer fingerprinting (3,800+ signatures from HTML, headers, cookies, scripts) • DNS CNAME resolution (maps CNAMEs like *.cloudfront.net to CDN providers) • TLS certificate issuer analysis (identifies SSL providers like Let's Encrypt, Cloudflare, DigiCert) • Custom HTTP header matching (catches platforms like Railway that have unique headers) Endpoints: • GET /analyze?url= — single URL analysis • POST /analyze/batch — up to 10 URLs concurrently, with CSV export • POST /compare — compare tech stacks between sites (shared vs unique) • GET /history — track how a site's stack changes over time • POST /webhooks — get notified when a domain is analyzed • GET /stats — your usage analytics (top domains, daily trends, cache hit rates) Technical details: • Built in Go, deployed on Fly.io, SQLite for storage • Results cached 24 hours (cache hits don't count against quotas) • HMAC-signed webhook delivery, SSRF protection, AES-256-GCM encrypted secrets • Free tier: 100 requests/month, no credit card Available on RapidAPI:rapidapi.com/mlugoapx/api/detectzestack OpenAPI spec:detectzestack.fly.dev/openapi.yaml I'd appreciate any feedback on the API design, detection accuracy, or use cases I haven't considered. Happy to answer questions about the implementation.