Turn your REINS listings into an API

What you can build on REINS

• Check the status of your listings

  Build this

  Reads the listings your office registered on REINS and, for each, its 取引状況 (transaction status) and the text in 取引状況の補足 (status notes).

  Takes

  Nothing, or a list of 物件番号 (listing numbers)

  Returns

  Listing number, property type, building name, location, price, transaction status, status notes

• Get inquiry counts for your listings

  Build this

  Reads the 引合件数 (inquiry counts) REINS shows for each of your listings: the last 3 days and the running total.

  Takes

  Nothing, or a list of 物件番号

  Returns

  Listing number, building name, inquiries in the last 3 days, total inquiries

• Look up a listing by its number

  Build this

  Searches REINS by 物件番号 and reads the listing: price, location, nearest lines and stations, transaction status and whether a 図面 (flyer) is registered.

  Takes

  物件番号 (12 digits)

  Returns

  Listing number, property type, price, location, lines and stations, transaction status, status notes, flyer registered

• Change a listing's transaction status

  Build this

  Opens one of your exclusive sale listings, sets 取引状況 to the value you give and writes the date and reason in 取引状況の補足.

  Takes

  物件番号, new transaction status, status notes

  Returns

  Listing number, transaction status, status notes

Automate REINS 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.

• Morning check of your listings' 取引状況

  Build this

  Starts

  Every weekday at 7:30

  Step 1

  Check the status of your listings on REINS.

  Step 2

  Keep the listings whose 取引状況 or 取引状況の補足 changed since the last run.

  Step 3

  Email you the list with listing number, building name, price, status and notes.

• Weekly inquiry counts for your seller reports

  Build this

  Starts

  Every Monday at 8:00

  Step 1

  Get the inquiry counts for every listing your office registered on REINS.

  Step 2

  Compare each total with last week's run to get the inquiries of the week.

  Step 3

  Have an AI step write one short paragraph per listing for its 業務処理状況の報告 (activity report).

  Step 4

  Email you the paragraphs, one per listing, ready to check and send.

• Status changes on listings you are following

  Build this

  Starts

  Every weekday at 12:00

  Step 1

  For each 物件番号 on your list, look up the listing on REINS.

  Step 2

  Keep the listings whose 取引状況 or price changed since the last run.

  Step 3

  Post each one to your webhook with listing number, price, status and notes.

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 the status of your listings” would look like.

curl https://api.fous.com/v1/runs \
  -H "Authorization: Bearer $FOUS_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "method": "system.reins.jp/get_listing_status",
    "input": {
      "listing_numbers": [
        "100138472915",
        "100138560247"
      ]
    }
  }'

{
  "status": "completed",
  "data": {
    "listings": [
      {
        "listing_number": "100138472915",
        "property_type": "マンション",
        "building_name": "Acme Residence Kichijoji",
        "location": "東京都武蔵野市吉祥寺本町2丁目",
        "price": 58800000,
        "currency": "JPY",
        "transaction_status": "書面による購入申込みあり",
        "status_notes": "2026年11月10日 書面受領"
      }
    ],
    "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.

REINS’s own options

The four REINS organisations describe no API or data feed for members. Members use the REINS IP website, where listings are registered, searched and updated, and inquiry counts download as CSV. Fees are charged by use and billed monthly.

Read on November 12, 2026: West Japan REINS: changes with the four-organisation system, Chubu REINS usage guideline, revised 1 January 2025, Kinki REINS: fees and payment.

Signing in to REINS

REINS IP signs you in with a 12-digit user ID and a password, issued to each member office by its association or the organisation's sub-centre. No second step is documented. With Fous you sign in once through REINS's own sign-in with your office's account: the login is sealed with AES-256, and an expired session is signed back in.

Worth knowing

Listings drop off after 92 days

Every listing, sale or rental, is deleted automatically 92 days after registration (the first day not counted) unless you run 物件更新 (listing renewal). Editing a listing with 物件変更 does not extend it.

Two days to change 取引状況

A status change is due within 2 days, closed days excluded, of the day after its cause, such as receiving a written purchase application. The date goes in 取引状況の補足.

Your seller sees the status too

The 登録証明書 carries a URL, a QR code and an ID and password for each listing. With them the seller of a 専任 or 専属専任 listing sees its summary, 図面 and 取引状況.

Open from 7:00 to 23:00

The REINS system runs from 7:00 to 23:00 and is closed from 28 December to 3 January. Schedule workflows inside those hours.

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