DEV Community: roland

I built a 18-Signal B2B Lead & Revenue Leak Scanner on a Single Cloudflare Worker

roland — Sun, 15 Nov 2026 19:53:10 +0000

Most B2B lead generation tools charge $99–$299/month just to give you stale database emails with zero context on why a prospect actually needs your help.

So I built LeakRadar Enterprise v3.0 — a real-time 18-signal telemetry auditor running entirely on Cloudflare Workers:

👉 Live App: https://leakradar.leakradar.workers.dev

What it does in ~800ms from the edge:

Live HTTP Proof Bar: Verifies HTTP status, CDN edge server, HTML payload weight in KB, and TTFB latency in milliseconds.
4-Pillar Positive & Negative Scoring: Grades domains across Edge & Security Infrastructure, Analytics & sGTM, Paid Ad Pixel Readiness (Meta, TikTok, LinkedIn), and Conversion Architecture.
Cloudflare data-cfemail XOR Decryption: Automatically crawls /contact and /about pages and decrypts hex-obfuscated emails to find decision-maker contacts.
25-URL Bulk Agency Engine: Scans 25 prospect domains in parallel and generates custom cold email openers based on the exact technical leaks found.

If you want to test the unlocked Pro remediation blueprints and 25-URL Bulk Engine, click "Enter License Key" and use this 4-day test key: VIP-4DAY

Try running a few domains through it and let me know what your site scores!

How I built a 1.8-second B2B Lead Scraper & 18-Signal Telemetry Auditor (Zero Headless Chrome)

roland — Sun, 15 Nov 2026 16:46:00 +0000

Most website audit and B2B lead enrichment tools rely on heavy Headless Chrome queues that take 30–45 seconds per domain and cost hundreds of dollars a month in server overhead.

I wanted to build an instant B2B prospecting and technical audit engine for web design, SEO, and PPC agencies that executes in under 2 seconds at the edge for £0 server cost.

Here is the live platform running on Cloudflare Workers:
👉 https://leakradar.leakradar.workers.dev

(If you want to test the locked Pro features—including the 250-domain Bulk CSV Scraper, Contact Vault, and White-Label Client Reports—click *"Unlock Pro"** in the top right and enter the 4-day developer key: VIP-4DAY)*

What It Does in ~1.8 Seconds

When you enter any domain (or hit the JSON API), the Worker fires parallel asynchronous fetch() streams from the nearest Cloudflare PoP across /, /contact, /contact-us, and /about:

18-Signal DOM & HTTP Telemetry Inspection:
- Ad Pixels: Meta/Facebook Pixel (fbevents.js), TikTok Pixel, LinkedIn Insight Tag, Google Ads Conversion tags.
- Analytics & Enterprise Stack: GA4, Google Tag Manager, Segment, Tealium, Hotjar, Microsoft Clarity, OneTrust.
- Conversion Architecture: Live Chat widgets (Intercom, Crisp, Tidio, Drift, Zendesk), CRM/Booking embeds (HubSpot, Calendly, Klaviyo), Lead forms, and JSON-LD application/ld+json schema.
- Edge & Security: Measures live Time-To-First-Byte (TTFB ms), inspects strict-transport-security (HSTS), and detects CDN edge headers.
Cloudflare data-cfemail Hex Decryption + Contact Scraping:
- Extracts verified corporate @domain emails, tel: phone lines, and social profiles across subpages.
- Includes a bitwise XOR hex decoder that automatically decrypts Cloudflare's data-cfemail email obfuscation on the fly:


javascript
function decCf(html) {
  let out = [], r = /data-cfemail="([0-9a-fA-F]+)"/g, m;
  while ((m = r.exec(html)) !== null) {
    let s = m[1], k = parseInt(s.substr(0, 2), 16), e = "";
    for (let i = 2; i < s.length; i += 2)
      e += String.fromCharCode(parseInt(s.substr(i, 2), 16) ^ k);
    if (e.includes("@")) out.push(e.toLowerCase());
  }
  return out;
}

I built a 2-second B2B website leak scanner

roland — Sun, 15 Nov 2026 13:30:53 +0000

Hey everyone, I built a fast technical website audit tool running entirely on Cloudflare Workers called LeakRadar:

https://leakradar.leakradar.workers.dev

You enter any prospect domain and in ~2 seconds the Worker fetches the DOM + contact subpages in parallel to check:

Missing Meta, Google, TikTok & LinkedIn retargeting pixels
Missing GA4 / GTM containers & live chat widgets
Server TTFB response latency & missing JSON-LD schema
Public contact emails + generates a white-label client report link (?mode=client)

Built it for freelance web designers and SEO/PPC agencies doing outbound prospecting. Test it out on any domain and let me know what you think!