Mercari Japan product data API

ShopAPIS extracts structured listing data from Mercari Japan — the country’s dominant C2C resale app — and returns it as clean JSON. For any item you get title, asking price, item-condition grade, brand, size, category, shipping payer, seller rating and the photo gallery, plus sold-price signals where available — the secondhand pricing data that retail catalogs do not contain.

Mercari is Japan’s largest peer-to-peer resale marketplace, with roughly 75M monthly visits in Japan and a catalog dominated by used fashion, collectibles and electronics (WPIC — Top 5 Japanese marketplaces ). Because it is C2C and app-first, its condition-graded, sold-price data is the strongest source for secondhand and resale pricing in Japan.

Why Mercari data is hard to get

Mercari is app-first with no public catalog API, and individual listings are short-lived. Each item is a unique, one-of-a-kind SKU that disappears the moment it sells, so condition grade, asking price and sold status must be captured precisely and quickly. The app uses mobile-grade clients, device fingerprinting and rate-limiting, and listing text is free-form Japanese rather than a fixed schema. ShopAPIS normalizes brand, size, condition and sold-state into consistent fields so you can build aggregate resale-price views instead of scraping the app yourself.

Data fields returned

• Identity — item ID, title, brand, category path
• Price — asking price, currency (JPY), price-drop history where available
• Condition — condition grade (new / like-new / good / fair), free-text condition note
• Attributes — size, color, model where parseable
• Status — on-sale / sold-out flag, sold-price signal
• Shipping — shipping payer (seller/buyer), ships-from prefecture
• Seller — seller rating, transaction count
• Media — photo gallery

Sample response

{
  "platform": "mercari_jp",
  "item_id": "m12345678901",
  "url": "https://jp.mercari.com/item/m12345678901",
  "title": "ナイキ エアフォース1 '07 27cm 美品",
  "brand": "NIKE",
  "category_path": ["メンズ", "靴", "スニーカー"],
  "price": { "asking": 8500, "currency": "JPY" },
  "condition": { "grade": "like_new", "note": "数回着用の美品です。箱付き。" },
  "attributes": { "size": "27cm", "color": "ホワイト" },
  "status": { "state": "on_sale", "sold": false },
  "shipping": { "payer": "seller", "ships_from": "東京都" },
  "seller": { "rating": 4.9, "transactions": 312 },
  "images": ["https://static.mercdn.net/item/detail/orig/photos/m12345678901_1.jpg"]
}

Markets and domains covered

Mercari Japan operates on jp.mercari.com (items under /item/), JPY-priced and Japanese-language. It is distinct from Mercari’s separate US marketplace. ShopAPIS resolves by item ID or URL and can aggregate comparable items by brand + model to estimate a market resale price.

Use cases

• Resale price benchmarking — build sold-price and asking-price bands per brand/model (/solutions/price-monitoring).
• Competitive intelligence — track how secondhand supply prices against new retail (/solutions/competitive-intelligence).
• Catalog enrichment — map free-form listings to brand, model and condition taxonomy (/solutions/catalog-enrichment).
• Inventory tracking — monitor on-sale vs sold-out supply for collectible categories (/solutions/inventory-tracking).

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