How to Find eBay Sold Listings
Applying the sold filter, direct URL parameters (LH_Sold=1, LH_Complete=1), reading sold vs asking prices, median vs mean, condition labels, market velocity by hand, and when manual research stops scaling.
Long-form · Methodology first · Tool second
Guides
How the data behind each tool actually works: what the platform exposes, what it hides, how to do it by hand, and when to stop doing it by hand.
How to Estimate Etsy Sales From Public Data
What Etsy exposes publicly versus what it hides, the review-rate formula, price-tier adjustments, niche calibration, confidence bands, trending and dormant signals, and a comparison of manual versus automated approaches.
How to Download YouTube Videos Programmatically
yt-dlp internals, the client path hierarchy, PO tokens, proxy layers and their economics, file size limits, running in cloud environments, and the managed API trade-off. Node.js examples included.