{"uid":"cap_Huq2_FdQDRENzn_C_b1WM","slug":"tech-detect-technology-stack-detection-via-x402-babbadcd","name":"Tech Detect — Technology Stack Detection via x402","description":"Domain in, technology stack out. Confidence and evidence for every hit. Pay per call in USDC over x402. No signup, no API key.","url":"https://stack.halowerk.com/stack/articles/caddy?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"url":{"type":"string","maxLength":2048},"previous":{"type":"object","required":["observed_at","technologies"],"properties":{"observed_at":{"type":"string","maxLength":40},"technologies":{"type":"array","items":{"type":"object","required":["name","category","version"],"properties":{"name":{"type":"string","maxLength":150},"version":{"type":["string","null"],"maxLength":80},"category":{"type":"string","maxLength":80}},"additionalProperties":false},"maxItems":150}},"additionalProperties":false}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.004","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.004/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.004","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.004","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_j3kLUDFQfJjg8FgSDc3XT","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.004","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Analyzes a domain URL and returns its detected technology stack with confidence scores and evidence, billed per-call in USDC via x402 protocol","exampleAgentPrompt":"What technologies is stripe.com running — web server, framework, CDN, analytics, all of it? Give me confidence scores and evidence for each hit.","exampleUseCases":[{"title":"Competitive tech stack audit","prompt":"What's the full technology stack behind notion.so? I want to know their frontend framework, backend indicators, CDN, analytics, and anything else you can detect, with confidence levels for each."},{"title":"Security and infrastructure recon","prompt":"Scan github.com and tell me what web server and infrastructure technologies it's using — I'm particularly interested in whether it's running Caddy, Nginx, or something else, and any version info you can detect."},{"title":"Monitoring stack drift over time","prompt":"Check shopify.com for its current tech stack. Last time I looked on 2024-11-01 it was running Nginx 1.21 and React — has anything changed since then?"}],"resultDescription":"Returns a list of detected technologies for the given domain, each with a name, category (e.g. web server, CMS, JavaScript framework, analytics), version (if detectable), confidence score, and supporting evidence indicating how the technology was identified.","failureModes":["Invalid or unreachable URL returns an error or empty technology list","Domain blocks fingerprinting requests, leading to low or zero detections","Version information unavailable for obfuscated or CDN-proxied sites","Payment failure via x402 protocol results in 402 response and no data returned","Malformed input schema (missing required fields) returns validation error"],"whenToPreferThis":"Choose this endpoint when you need pay-as-you-go technology stack detection without API key signup — ideal for one-off queries, agent workflows, or low-volume use cases billed in USDC via x402. Prefer it over subscription-based alternatives like BuiltWith or Wappalyzer when you want frictionless access with per-call pricing. The optional `previous` field makes it especially useful for change-detection workflows where you want to diff against a prior observation.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-13T00:40:40.797Z","isFirstParty":false,"canonicalSlug":"tech-detect-technology-stack-detection-via-x402-35a93e11"}