November 6: We updated the article regarding the start date for server-side Google Tag Manager support.
September 11, 2025: We completed this release.
August 26, 2025: We announced this information.

Yahoo! JAPAN Ads Search Ads

September 10, 2025

We have launched the conversion API for Search Ads.
The conversion API is designed to measure and optimize ad performance more accurately.
It is less affected by browser security restrictions and ad blockers, allowing advertisers to obtain more reliable tracking data.
Even if you can't use the current conversion tracking tag, this feature provides conversion tracking.

• Server-side Google Tag Manager is scheduled to support this feature.
• We informed you that support would start around October, but it's delayed. We'll notify you once it's complete. (added on November 6, 2025)
• This API is available only for Search Ads. It is a different feature from the conversion API already offered for Display Ads.

For detailed specifications of the conversion API, see the following:
Yahoo! JAPAN Ads Search Ads Conversion API Reference