h ichi

I'm a data engineer based in Japan. I build and maintain market-data Actors for Japanese marketplaces — sold-price comps, market statistics, and resale value in one call, instead of raw listing dumps.

Start here (most used):

• Mercari Japan Price Checker  — what an item actually sells for on Mercari Japan
• Yahoo! Auctions Japan Sold Comps  — closed-auction price statistics

The family: the same "one call → decision-ready statistics" design across Yahoo! Auctions, Mercari, PayPay Flea Market, Mandarake, BOOKOFF, Yuyu-tei, SUUMO / at home (real estate), Carsensor (used cars), Hello Work (jobs), JRA / keirin / boatrace (racing), Tabelog, and Polymarket / Kalshi (prediction markets). Chinese and Korean editions exist for the cross-border tools.

Why me: I live here, read the sites natively, and run data pipelines for a living. When a Japanese site changes its layout, I notice and fix it fast. Every Actor is health-checked weekly, fails loudly instead of returning empty data, and never charges for a query that returns nothing.

Unofficial and independent — none of these tools is affiliated with or endorsed by the sites they read. Public data only, no login.

📫 Questions or feature requests → open an Issue on any of my Actors (I reply within 2 business days, JST). Feedback shapes what I build next.