Programmatic access to Japan's largest doujin marketplace for market research and price tracking.
DLsite (dlsite.com) is the biggest marketplace for Japanese doujin — voice works, ASMR, games, and art, mostly adult (R18 / RJ-numbered) titles. If you build tools for the doujin niche — a recommendation engine, a price tracker, a sale watcher, or a catalog — the first thing you need is a reliable way to pull structured listing and pricing data at scale.
DLsite serves heavy JavaScript, splits shops by language (and separately handles the R18 home vs general maniax trees), and paginates everything. A hand-rolled crawler breaks whenever the front-end changes. And because much of the catalog is adult content, you want a data source that returns clean fields without needing you to drive a browser session yourself.
This kind of data collection is for your own analysis and tools. Don't republish the actual works (that's copyright), and don't expose any buyer/circle personal data. Title metadata, genres, and prices are fine; the purchased content is not.