Yahoo! Auctions Japan Price Trend — Sold Price by Month

What it does: Reads about six months of ended auctions on Yahoo! Auctions Japan for your keyword and returns the sold price month by month, so you can see the direction.

You enter: keywords, e.g. Nikon Z6; optionally months to cover (default 6) and a price window

You get: per month: sales counted, median sold price, middle 50% range, and whether it counted toward the direction (months under 5 sales do not). Overall: rising / falling / flat, change in %, sales sampled, date span — from the first 300 ended auctions.

Price: $0.02 per keyword. +$0.002 per auction if you also want the list (off by default). Fewer than two months with enough sales = no charge.

Example: enter Nikon Z6 with a ¥50,000 floor, reading past the 300-auction default → falling · -13.3% from 2026-03 to 2026-08 · 327 sold auctions, every one the search reported (real run, 2026-08-09)

Unofficial — not affiliated with Yahoo! Auctions. Reads public pages only.

Where the history comes from

Yahoo! Auctions' public search of finished auctions keeps about six months of history and shows the newest first. This Actor reads through that window when you run it and groups each sale by the month it ended.

What counts as a sale. Only ended auctions that received at least one bid. An ended auction with no bids is an asking price nobody accepted, and counting it would drag every median toward the starting price.

No price database is kept between runs. Every call re-reads the live pages, so there is nothing to go stale and nothing about you to store.

Output

One trend_summary per keyword:

field	meaning
months[]	per month: month, soldCount, medianJpy, p25Jpy, p75Jpy, usedInTrend
trendDirection	rising / falling / flat
changePct	first to last month of the trend line
monthsCovered / monthsUsed	how much of the window actually had data
soldTotal / sampledListings / totalListingsFound	auctions that sold, auctions read, auctions the search reported
overallPriceJpy	the whole window in one line: lowest, middle 50%, median, highest, average (plus USD)
windowCovered / budgetExhausted	whether the six months were really reached, or the read stopped early
mixedKeywordLikely	true when the prices are so spread out that the keyword probably caught more than one product
oldestEndTime / newestEndTime	the real span reached

Measured on 2026-08-09 (real run) — Nikon Z6 with a ¥50,000 floor:

{
  "type": "trend_summary",
  "keyword": "Nikon Z6",
  "totalListingsFound": 327,
  "soldTotal": 327,
  "monthsCovered": 6,
  "months": [
    { "month": "2026-03", "soldCount": 72, "medianJpy": 120500, "p25Jpy": 88000, "p75Jpy": 148200, "usedInTrend": true },
    { "month": "2026-04", "soldCount": 70, "medianJpy": 137800, "p25Jpy": 95250, "p75Jpy": 157095, "usedInTrend": true },
    { "month": "2026-05", "soldCount": 46, "medianJpy": 120500, "p25Jpy": 94040, "p75Jpy": 146696, "usedInTrend": true },
    { "month": "2026-06", "soldCount": 51, "medianJpy": 105000, "p25Jpy": 88050, "p75Jpy": 151890, "usedInTrend": true },
    { "month": "2026-07", "soldCount": 46, "medianJpy": 160000, "p25Jpy": 107498, "p75Jpy": 247500, "usedInTrend": true },
    { "month": "2026-08", "soldCount": 16, "medianJpy": 104415, "p25Jpy": 86125, "p75Jpy": 145848, "usedInTrend": true }
  ],
  "trendUsable": true,
  "trendDirection": "falling",
  "changePct": -13.3,
  "monthsUsed": 6,
  "oldestEndTime": "2026-02-11T15:15:51+09:00",
  "newestEndTime": "2026-08-09T22:05:09+09:00"
}

The guard that matters

A month with two sales has a meaningless median. Months below minPerMonth (default 5) are still reported with their count, but carry usedInTrend: false and are excluded from the direction and the change figure. The trend is never computed on a sample that cannot support it, and you can always see which months were dropped.

If fewer than two months clear the bar, the Actor returns trendUsable: false and is not charged. trendUnusableReason says which of the three cases it was: nothing at all matched that spelling, the ended auctions all closed without a bid, or the history is real but too thin for a direction. Only the last one is fixed by widening the search.

Pricing

$0.02 per keyword. Individual sold auctions are $0.002 each and off by default. If fewer than two months have enough sales, the keyword is not charged. You pay per keyword; there is no monthly fee.

Public pages only, no login, requests spaced out. No seller information is collected.

If something goes wrong

• Wrong number or a failed run? Open a ticket on the Issues tab. I read every one and reply within 2 business days (Japan time).
• You never get a fake "empty" result. If the site can't be read, the run fails and says so.
• No results = no charge. You only pay for results you actually get.
• Checked every week. An automatic test runs this tool weekly; if the site changes, I fix it.
• Public pages only. No login, no personal data, and it goes easy on the site.

More tools by the same author

• Yahoo! Auctions Japan Sold Prices — Median, Range, Bids
• Yahoo! Auctions Japan Listings — One Row Each, $0.0015
• Yahoo! Auctions Japan Underpriced Deals — Below Sold Price
• Mercari Japan Sold Prices — What Items Really Sell For
• Japan Used Camera & Lens — Dealer Price vs Sold Price
• Japan Figure & Gunpla — New Price vs Used Sold Price
• Used iPhone & Android Prices Japan — Dealer vs Sold
• Yahoo, Mercari & PayPay Japan — Same Item, 3 Prices

All tools (Japan marketplaces, real estate, jobs, racing, prediction markets): https://apify.com/jpmarketdata

Disclaimer

Unofficial, independent tool — not affiliated with, endorsed by, or sponsored by Yahoo! Auctions. Product names and logos belong to their owners and only say where the data comes from. Data is read from public pages, for market research; check before you act on it.