Google Adsense Management API: servingLimitExceeded with a few queries - adsense-api

Question

We are receiving a servingLmitExceeded after making a few queries to the Adsense Management API for obtaining daily info about each app. We are connecting to 5 accounts.
What we do is first obtain a list of the apps of each account running a report of the last 30d:
$start_date = 'today-30d';
$end_date = 'today-1d';
$options = array(
'metric' => array('EARNINGS'),
'dimension' => array('APP_ID','APP_NAME'),
);
Then, for each app (like 36 in total divided in all the accounts) we run the following report:
$start_date = $today->format("Y-m-d");
$end_date = $today->format("Y-m-d");
$options = array(
'metric' => array('EARNINGS','AD_REQUESTS','AD_REQUESTS_COVERAGE','AD_REQUESTS_CTR','AD_REQUESTS_RPM','CLICKS','COST_PER_CLICK'),
'dimension' => array('APP_ID','COUNTRY_CODE'),
'filter' => array('APP_ID=#'.$app),
'sort' => '+APP_ID'
);
After a few apps, we receive the following error:
{
"error": {
"errors": [
{
"domain": "usageLimits",
"reason": "servingLimitExceeded",
"message": "Serving Limit Exceeded"
}
],
"code": 403,
"message": "Serving Limit Exceeded"
}
}
We think that we aren't hiting any of the limits that appear here: https://developers.google.com/adsense/management/appendix/limits
We are doing less than 50 requests in total per day and our limits now are 100 queries per 100 second per user:
If we check the Google APIs console, it appears that the errors are being thrown by adsense.accounts.list
Does anybody knows how to avoid this problem?

Answer 1

A simple retry policy for the API call has worked for us.
It'll often go through if we retry 2-3 times with a 30s wait.