Manual billing sync request — 429 "prepayment credits are depleted" on newly funded Prepay balance

Gemini API
1

Requesting a manual billing sync. Every generateContent call returns 429
RESOURCE_EXHAUSTED “Your prepayment credits are depleted”, on a Prepay
balance funded today with no usage against it.

Billing account: 0108A9-B6592E-528E.. (cuentamaestraAD)
Projects: agente80-tcn, agente80-d..
Country/currency: Mexico / MXN
Prepay funded: ~MXN 100 on 2026-08-17
Usage so far: zero — these projects have never made a successful call

What I verified before posting:

  • Cloud Billing console shows the account ACTIVE and healthy, Postpay cycle
    with a MXN 2000 monthly limit and a valid card. No alerts, no suspension.
  • The Generative Language API is enabled on both projects.
  • API keys are the new service-account-bound type, restricted to the
    Gemini API, each bound to a service account in its own project
    (agente80-dev-gemini@…, agente80-tcn-gemini@…).
  • All four keys across BOTH projects fail identically, so the common
    factor is the billing account, not a single key or project.
  • A different, older project on the SAME payments profile and the same
    card works fine right now (HTTP 200 on the same model), which rules out
    the payment method and the profile.
  • Reproduced on gemini-3.1-flash-lite and gemini-3.5-flash-lite.
  • Retried over ~30 minutes after funding; still 429.

Exact response:

{
“error”: {
“code”: 429,
“message”: “Your prepayment credits are depleted. Please go to AI
Studio at https://ai.studio/projects to manage your
project and billing.”,
“status”: “RESOURCE_EXHAUSTED”
}
}

Could you please run a manual billing sync for billing account
0108A9-B6592E-528E..? Thanks.

2

Hello @Abelardo_D ,
Can you navigate to the billing Tab in AI Studio and verify if you are seeing a Credit Balance displayed under payments? Is the page asking you setup a pre-pay billing account?