Gemini API returns 402 “prepayment credits are depleted” despite positive Prepay balance
Hello,
My Gemini API project is still returning:
HTTP 402 RESOURCE_EXHAUSTED
“Your prepayment credits are depleted.”
However, my Google AI Studio Billing page shows a positive Prepay balance.
Project name: Default Gemini Project
Project ID: gen-lang-client-06136897..
Billing account: My Billing Account
Prepay balance: approximately KRW 45,632
Top-up: KRW 50,000 on October 1, 2026
Billing tier: Tier 1 · Prepay
The payment has already been completed and I received the Google Cloud payment confirmation email.
The issue is that the Billing page shows a positive balance, but the project still shows a red “No credits” warning, and Gemini API requests continue to fail with HTTP 402.
There is only one Gemini project on this billing account, so this does not appear to be a project mismatch.
Could you please check whether the Prepay balance has failed to sync to the project’s live billing/serving state, and manually resync the billing status if necessary?
I can provide screenshots showing:
1. The positive Prepay balance
2. The “No credits” warning on the same billing account
3. The HTTP 402 error
4. The payment
confirmation email
Thank you.