[AdMob API] mediationGroups list endpoint suddenly returns empty response

[강병구]

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 :

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

Console log (trimmed):

* 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 < {}

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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.

[AdMob API Developer Forum]

Thanks for reaching out.

A buggy change went live which caused this issue on List MediationGroups API.

We have rolled back to a previous stable build and the API should behave correctly as expected.

Please let us know if you are still facing the same issue.

Thanks