API_KEY_SERVICE_BLOCKED on generativelanguage.googleapis.com — 100% error rate, all checks pass

Gemini API
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1

Project number: 7041504162..

Issue: All requests to generateContent are blocked with:
“reason”: “API_KEY_SERVICE_BLOCKED”

Verified:

  • Generative Language API is enabled
  • Billing is active (Blaze plan)
  • API key has no application/API restrictions
  • Tested with brand new unrestricted key — same error
  • GCP dashboard shows 28 requests, 100% error rate for “Firebase AI Logic API”
  • Was working previously in this same project, stopped suddenly
  • Tested via direct curl, not just SDK — same block

Requesting help identifying why this project is blocked at the consumer level despite all settings being correct.

2

Hello @Realtech_Solutions ,
The Gemini API has stopped accepting requests from unrestricted API keys to prevent unauthorized usage and billing risks.
Please restrict your API key to Gemini API (generativelanguage.googleapis.com) and retry.
Alternatively, you could generate new restricted keys in Google AI Studio and update your code to use the new key.

3

Thanks for your reply.