[AdMob API] mediationGroups list endpoint suddenly returns empty response

[ByungGu Kang]

Hi,

We have been using the AdMob API to fetch our mediationGroups list, and it had been working fine.
However, since 2025-12-10 14:42:11 (KST, UTC+09:00) the API started returning an empty result.

We tested it with a direct curl request and confirmed that the HTTP status is 200, but the response body is just an empty JSON object {}.

Here is the curl request and response (with sensitive information redacted):

curl https://admob.googleapis.com/v1beta/accounts/pub-8316********4037/mediationGroups \
  -H 'Authorization: Bearer ya29.[REDACTED]' \
  -H 'Content-Type: application/json' \
  -v

* Host admob.googleapis.com:443 was resolved.
*   Trying 142.250.194.74:443...
* Connected to admob.googleapis.com (142.250.194.74) port 443
* using HTTP/2
> GET /v1beta/accounts/pub-8316********4037/mediationGroups HTTP/2
> Host: admob.googleapis.com
> User-Agent: curl/8.7.1
> Accept: */*
> Authorization: Bearer ya29.[REDACTED]
> Content-Type: application/json
>
< HTTP/2 200
< content-type: application/json; charset=UTF-8
< date: Wed, 10 Dec 2025 07:52:37 GMT
< server: ESF
<
{}

Up until 2025-12-10 14:42:11 (KST) this endpoint was returning our mediation group list as expected.

Thank you in advance for your support.

[Mobile Ads SDK Forum Advisor]

Hi,

Thank you for contacting the Google Mobile Ads SDK support team.

This channel is intended for Google Mobile Ads SDK technical and implementation–related issues. Based on the information provided, the behavior you’re experiencing is not related to the Google Mobile Ads SDK.

The request in question is made directly to the AdMob REST API and returns an HTTP 200 response, which indicates that authentication and connectivity are functioning as expected. Since this issue involves the AdMob API returning an empty response for mediation groups despite previously returning data, it falls outside the scope of SDK support.

This will need to be investigated by the AdMob API team, as SDK support does not have visibility into or control over API-side responses.

I am routing this case to the AdMob API team for further investigation.

Thanks,

 

Mobile Ads SDK Team

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[2025-12-18 10:16:22Z GMT] This message is in relation to case "ref:!00D1U01174p.!500Ht01wn7U2:ref" (ADR-00347896)