Can I vibe code ZIK Analytics?

Build a lightweight marketplace product research dashboard using Next.js, Tailwind CSS, and Node.js.

1. DATA SOURCES & INGESTION
- Integrate the official eBay Browse and Finding APIs to query items by keyword, seller ID, or category.
- Allow users to enter a target eBay seller username or product keyword.
- Fetch sold listings, prices, listing titles, shipping costs, and publish dates.

2. METRICS ENGINE
- Calculate Sell-Through Rate: (Total Sold Items / Total Active Listings) * 100.
- Calculate Total Revenue: Sum of (Item Price * Quantity Sold) over a 30-day window.
- Calculate Average Item Price: Total Revenue / Total Units Sold.
- Extract top 2-word and 3-word n-grams from titles to identify high-density keywords.

3. USER INTERFACE
- Search Bar: Niche search and competitor search modes.
- Overview Metrics Cards: Sell-through rate, total earnings, average price, total sold items.
- Keyword Cloud Table: Display top keywords, search volume (if available), and frequency in top 100 listings.
- Competitor Table: Display competitor listings, price, total sold, and direct listing link.

4. FAILURE MODES & EDGE CASES
- Rate Limits: Handle eBay API 429 errors with exponential backoff and request caching in Redis.
- Null Sold Data: If historical sold data is hidden, display estimated metrics based on active list dates and stock count changes.
- Empty Query: Show helpful fallback states when a seller has zero sales in 30 days.

5. OUT OF SCOPE
- Full web scraping of AliExpress/Amazon (use official APIs only).
- Proxy management infrastructure.
- Multi-tenant enterprise SaaS billing.

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