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Tech Detect — Website Technology Stack Fingerprinter
x402
Tech Detect — Website Technology Stack Fingerprinter is a paid API for AI agents from stack.halowerk.com, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-13).
Detects the technology stack (frameworks, libraries, CMSs, analytics tools, etc.) used by a given domain URL, returning each technology with confidence scores and supporting evidence.
Price / call$0.004
Success—
StatusUnknown
How this service works
Purpose-bound Umami observation (analytics) using the existing fresh Stack-Monitor. Returns stack_umami_decision, direct versus inferred status, evidence, optional version difference against a caller-owned baseline and reusable snapshot. Missing fingerprints do not prove absence. No background scheduling, CVE, compatibility or installed-extension inventory. Existing outbound safeguards remain in the injected motor. One public HTTPS root domain, up to150 baseline technologies; 9s timeout.
Output
Returns a list of detected technologies for the given domain, each entry including the technology name, its category (e.g. 'CMS', 'Analytics', 'JavaScript Framework'), detected version if available, a confidence score, and evidence supporting the detection. Optionally compares against a previously observed snapshot to highlight changes.
Example use cases
Competitor tech stack audit
“What technologies is stripe.com running? I want to see their frontend frameworks, backend signals, analytics tools, and anything else you can detect, with confidence scores for each.”
Sales lead enrichment
“I have a prospect at acme.com — before my call, can you figure out what CMS, ecommerce platform, and marketing tools their site uses so I know what stack to pitch against?”
Ongoing stack change monitoring
“Last week you told me notion.so was using Next.js and Segment — can you re-scan them now and tell me if anything in their tech stack has changed since then?”
Technical details
Endpoint
POSThttps://stack.halowerk.com/stack/articles/umami?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need per-call, pay-as-you-go technology stack detection with no API key or subscription required. Particularly well-suited for agents that need to enrich CRM records, conduct competitive analysis, or monitor stack changes on an ad-hoc basis. The optional 'previous' parameter makes it ideal for change-detection workflows. The x402 payment model makes it trivially embeddable in autonomous agent pipelines without credential management.
Side effects
- Unresolvable or offline domain returns no technologies or an error
- Heavily obfuscated sites may yield low-confidence or sparse results
- Rate limiting or payment failure via x402 protocol results in HTTP 402 with no data
- Invalid URL format triggers input validation error
- Sites with aggressive bot-blocking may defeat fingerprinting probes
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| url | string | |
| previous | object |
Tags
x402
Reviews
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