LY Ads API | Developer Center

2026/04/02

Display Ads (Auction): Changes to placement list create and edit views

Updates

April 2, 2026: The article has been updated following the removal of the old fields.
December 18, 2025: This release has completed.
December 10, 2025: Updated comments on display rules for reach metrics and added changes to the download file.
October 15, 2025: We announced this information.

Product

Yahoo! JAPAN Ads Display Ads (Auction)

Tool

Campaign Management Tool
Campaign Editor

Date

December 17, 2025

Summary

We support changes to the placement list create and edit views.

Change display rules for reach metrics

We have changed the display rules for reach metrics [impressions, users] in the list of placement URLs that appears when selecting "Select URL/ad place name you searched" in the placement list create and edit view.

Before: Reach per device [PC, smartphone, tablet]
After: Total reach across all devices

This change has been made in consideration of changes in circumstances since the feature was first released.

<Comments (updated on December 10, 2025)>
The total reach across all devices is calculated using a more accurate aggregation method than the previous device-specific approach. As a result, the values may be lower than those before the change.

Add character codes for download files (updated on December 10, 2025)

You can choose either "UTF-8" or "UTF-16" as the character encoding when downloading placement URLs in CSV format.

<Views>

• "Add URL" column of the create and edit placement list view.
• The URL set screen displayed from the "i" icon in the placement list.

Impact on Yahoo! JAPAN Ads Display Ads API

Versions affected

v18

Services

PlacementUrlIdeaService

Change

Values will now be available in the following fields of the response when retrieving placement URL candidates.

• reaches: total reach across all devices
• adRequests: total ad requests across all devices

Comments

• Preceding are only available in v18. Learn more details in "Yahoo! JAPAN Ads Display Ads API v18 Release Note".
• The values of the preceding fields will be available after the launch date (December 17, 2025).
• The following fields were removed on April 1, 2026. Please use the new fields above going forward.
  • desktopReaches: reach per PC
  • desktopAdRequests: ad requests per PC
  • smartPhoneReaches: reach per smartphone
  • smartPhoneAdRequests: ad requests per smartphone
  • tabletReaches: reach per tablet
  • tabletAdRequests: ad requests per tablet