TechStack Fingerprinter API

Sub-Millisecond Technographic Scanner & BuiltWith Unbundled for Cold Outreach & AI Sales Agents

BuiltWith costs $495/month, which is prohibitive for growth teams, outbound agencies (Clay.com, Smartlead, Instantly), and automated scraping pipelines.

TechStack Fingerprinter API inspects any website in sub-50ms and extracts its full technographic profile: eCommerce platforms (Shopify, WooCommerce), CMS (WordPress, Webflow), Frontend Frameworks (React, Next.js), Analytics (GA4, PostHog), Marketing CRMs (HubSpot, Klaviyo), Payment Gateways (Stripe), and CDNs (Cloudflare, Vercel).

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⚡ Key Features

• 🏎️ Sub-50ms Execution: 0ms cold-start serverless edge running across 300+ worldwide Cloudflare locations.
• 🔍 70+ Deep Signatures: Inspects HTTP response headers, DOM script injections, meta tags, and CDN routing.
• 🛡️ Built-in Anti-SSRF Protection: Automatically filters private IPs (RFC 1918) and cloud metadata targets (169.254.169.254).
• 📊 Clay & n8n Ready: Clean, normalized JSON schema designed specifically for table enrichment and cold email personalization.
• 📦 Batch Scanning: Inspect up to 5 domains concurrently in a single API call (POST /v1/batch).

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🚀 Quick Start (cURL)

1. Fingerprint a Domain (POST)

curl -X POST https://techstack-fingerprinter-api.p.rapidapi.com/v1/fingerprint \
  -H "Content-Type: application/json" \
  -H "X-RapidAPI-Key: YOUR_API_KEY" \
  -H "X-RapidAPI-Host: techstack-fingerprinter-api.p.rapidapi.com" \
  -d '{"url": "https://gymshark.com"}'

Response (Sub-50ms):

{
  "success": true,
  "result": {
    "url": "https://gymshark.com",
    "domain": "gymshark.com",
    "status_code": 200,
    "response_time_ms": 48,
    "technologies_count": 8,
    "categories": {
      "ecommerce": ["Shopify"],
      "cms": [],
      "frameworks": ["React"],
      "analytics_tracking": ["Google Analytics 4", "Google Tag Manager", "Meta Pixel"],
      "marketing_crm": ["Klaviyo"],
      "payments": ["Stripe"],
      "hosting_cdn": ["Cloudflare"],
      "security_compliance": ["OneTrust"]
    },
    "technologies": [
      { "name": "Shopify", "category": "ecommerce", "confidence": "high", "matched_via": "header: x-shopify-stage" },
      { "name": "Klaviyo", "category": "marketing_crm", "confidence": "high", "matched_via": "html pattern: static.klaviyo.com" },
      { "name": "Cloudflare", "category": "hosting_cdn", "confidence": "high", "matched_via": "header: server" }
    ],
    "security_headers": {
      "has_https": true,
      "has_hsts": true,
      "server_header": "cloudflare"
    }
  }
}

2. Quick Detect (GET)

curl "https://techstack-fingerprinter-api.p.rapidapi.com/v1/detect?domain=stripe.com" \
  -H "X-RapidAPI-Key: YOUR_API_KEY" \
  -H "X-RapidAPI-Host: techstack-fingerprinter-api.p.rapidapi.com"

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🐍 Python Example (Enriching Prospects for Cold Email)

import requests

def get_prospect_stack(domain: str):
    url = "https://techstack-fingerprinter-api.p.rapidapi.com/v1/fingerprint"
    headers = {
        "Content-Type": "application/json",
        "X-RapidAPI-Key": "YOUR_RAPIDAPI_KEY",
        "X-RapidAPI-Host": "techstack-fingerprinter-api.p.rapidapi.com"
    }
    res = requests.post(url, json={"domain": domain}, headers=headers)
    data = res.json()
    
    if data.get("success"):
        cats = data["result"]["categories"]
        is_shopify = "Shopify" in cats.get("ecommerce", [])
        has_klaviyo = "Klaviyo" in cats.get("marketing_crm", [])
        return {
            "is_ecommerce": bool(cats.get("ecommerce")),
            "ecommerce_tool": cats.get("ecommerce"),
            "email_crm": cats.get("marketing_crm"),
            "icebreaker": f"Noticed you're using {cats['ecommerce'][0]} with {cats['marketing_crm'][0]}!" if is_shopify and has_klaviyo else None
        }
    return None

print(get_prospect_stack("allbirds.com"))

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🟨 Integration with Clay.com & n8n

1. In Clay or n8n, add an HTTP Request / API Action.
2. Method: POST
3. URL: https://techstack-fingerprinter-api.p.rapidapi.com/v1/fingerprint
4. Body: {"domain": "{{ prospect.website }}"}
5. Map result.categories.ecommerce[0] to your Clay column to filter high-intent prospects immediately!

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🛡️ Service Level & Architecture

• Cold Start: 0 ms (Cloudflare V8 Isolates across 300+ global data centers).
• Latency: Sub-50ms website fetch & signature analysis.
• Data Retention: 100% stateless proxy. No crawled websites or user targets are stored.