Turn MonotaRO into an API

What you can build on MonotaRO

• Check prices and shipping times

  Build this

  Reads the product page for each 注文コード you give: the 品番 (part number), the 販売価格 (selling price) with and without tax and the 出荷目安.

  Takes

  注文コード list

  Returns

  注文コード, 品番, product name, brand, 販売価格 (税別), 販売価格 (税込), 参考基準価格, 出荷目安, 返品不可, 代引不可

• Get order statuses from ご購入履歴

  Build this

  Reads ご購入履歴 in マイページ: each order's 注文書番号 (order number) and its ご注文状況 (order status), such as 出荷済み or キャンセル.

  Takes

  Ordered since (optional)

  Returns

  注文書番号, order date, ご注文状況, items with 注文コード and quantity

• List your 定期注文

  Build this

  Reads the 定期注文 screen in マイページ: each recurring order's item, quantity, frequency, delivery address and next order date.

  Takes

  Nothing

  Returns

  注文コード, product name, quantity, frequency, delivery address, next order date

• Skip the next 定期注文 delivery

  Build this

  Opens one recurring order on the 定期注文 screen and skips its next scheduled order.

  Takes

  注文コード, delivery address

  Returns

  注文コード, skipped order date, next order date

Automate MonotaRO with a workflow

A workflow runs your methods as one process, with nobody at the screen. A schedule or a call from your own system starts it, the steps run in order, and the result arrives in your inbox or in the systems you already use.

• Price and 出荷目安 changes on your usual items

  Build this

  Starts

  Every weekday at 8:00 Asia/Tokyo

  Step 1

  Check prices and shipping times for the list of 注文コード you keep.

  Step 2

  Keep the items whose 販売価格 or 出荷目安 changed since the last run.

  Step 3

  Email you the changes, with the old and new values.

• Order status changes from ご購入履歴, to your system

  Build this

  Starts

  Every day at 17:00 Asia/Tokyo

  Step 1

  Get order statuses from ご購入履歴 for the last 30 days.

  Step 2

  Keep the orders whose ご注文状況 changed since the last run.

  Step 3

  Post 注文書番号, ご注文状況 and items to your ERP or Slack webhook.

• 定期注文 due this week, with today's prices

  Build this

  Starts

  Every Monday at 9:00 Asia/Tokyo

  Step 1

  List your 定期注文 and keep the ones with a next order date in the next 7 days.

  Step 2

  For each one, check the price and 出荷目安 of its 注文コード.

  Step 3

  Email you the list, so someone can change or skip an order in time.

You can run a workflow by hand on every plan, Free included. Schedules and webhook triggers come with the paid plans, from $29 a month.

Once built, one call from your code

Once you have built a method, it is one POST to /v1/runs from your backend, or a tool an AI agent calls over MCP. This is what “Check prices and shipping times” would look like.

curl https://api.fous.com/v1/runs \
  -H "Authorization: Bearer $FOUS_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "method": "www.monotaro.com/check_prices_and_shipping_times",
    "input": {
      "order_codes": [
        "04218837",
        "05561290"
      ]
    }
  }'

{
  "status": "completed",
  "data": {
    "items": [
      {
        "order_code": "04218837",
        "part_number": "AC-2210B",
        "name": "Nitrile work gloves, M, 100 pieces",
        "brand": "Acme",
        "price_excl_tax": 1480,
        "price_incl_tax": 1628,
        "reference_price_excl_tax": 1650,
        "shipping_estimate": "当日出荷",
        "non_returnable": false,
        "no_cash_on_delivery": false
      }
    ],
    "currency": "JPY",
    "count": 1
  }
}

An example with invented data, not a ready-made endpoint. The method exists in your organization once you build it, and its name, inputs and fields follow your request.

MonotaRO’s own options

MonotaRO's pages describe no API for ordinary monotaro.com accounts. For larger companies it offers two purchasing services: モノタロウ PunchOut, which links your own purchasing system to its catalog, and モノタロウ ONE SOURCE Lite, which adds approvals and a download of 請求明細データ (invoice line data) for your accounting system.

Read on November 12, 2026: モノタロウ PunchOut, モノタロウ ONE SOURCE Lite, モノタロウ smartphone app.

Signing in to MonotaRO

monotaro.com signs you in with a ユーザーID (user ID) and password on its ログイン page, and the same account opens マイページ, ご購入履歴 and 定期注文. With Fous you sign in once through MonotaRO's own sign-in with your own account. The login is sealed with AES-256, and code and AI agents never see it.

Worth knowing

Prices move by the day

Under 日替わり特価 (daily deals), a set category is 10% off each day, and on some days MonotaRO brand items are 15% off. A price change between two runs can be one of these, not a lasting change.

定期注文 prices are not fixed

A recurring order's price can change while it runs, and MonotaRO emails you beforehand. A confirmation email goes out 4 days before each order date, and an item that is discontinued stops its 定期注文 automatically.

Returns have a short window

For business accounts, a return or exchange has to be reported within 2 weeks of the shipment date. Opened or used items, and items marked 返品不可 on the product page, cannot be returned.

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