My API calls are failing with 'Your project has been denied access. Please contact support.' This happens even on a raw curl request on a brand new project

Gemini API
1

im building an app using gemini models. it works flawlessly untill 11-05-2026 till 8:45am. but after that im not able to get the response from gemini models.

when i test the below commands in google cloud shell terminal i got error:

my command : curl -H “Content-Type: application/json” -d ‘{“contents”:[{“parts”:[{“text”:“Say the word Hello”}]}]}’ -X POST “https://generativelanguage.googleapis.com/v1beta/models/gemini-3.1-flash-lite-preview:generateContent?key=GEMINI_API_KEY”

--

error :

{

“error”: {

“code”: 403,

“message”: “Your project has been denied access. Please contact support.”,

“status”: “PERMISSION_DENIED”

}

}

i also have an amount for ai calls :

my billing screenshot

inside google cloud billing account overview i got below red tab label that says:

Your payment information could not be processed. Visit the payment overview page to take action on your account to prevent service disruption. (payment overview) button

when i click the payment overview in the red tag i got below content

2

Hi, I just ran into this problem and what solved it for me was setting static IP addresses in the API key settings.

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3

Hi @Mahaprabhu_Boominath

I believe the issue here is the billing error you’re seeing:

Your payment information could not be processed.

If you can’t resolve the billing issue yourself, please contact Cloud Billing Support.