Scraping Prices Without an API: Chrome Content Script Patterns for Japanese E-Commerce
Japanese e-commerce is fragmented. The same product — a vintage camera, a game console, a brand bag — can vary by ¥5,000–¥30,000 between Amazon.co.jp, Rakuten, Mercari, and Yahoo! Auctions. Finding the delta requires opening four tabs and cross-referencing manually. I built Arbitra to automate this.
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