503 error 'UNAVAILABLE' for gemini-2.0-flash API

Gemini API
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  1. gemini-2.0-flash API free version always returns “503 UNAVAILABLE” error. Is there a solution?
  2. Does the paid version of the gemini-2.0-flash API encounter similar ‘503 UNAVAILABLE’ errors? If not, we can subscribe to the paid version.
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Hi @liugang_shang , Welcome to the forum.

A 503 error usually indicates that the service is temporarily overloaded or unavailable. You can try temporarily switching to another model to see if that resolves the issue, or wait a short time and retry your request.
Upgrading to a paid tier generally provides higher rate limits and may reduce the frequency of such errors.

Thanks

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Hi i have been facing outages on the production server since a week now and the system is unusabel. I am trying to find link to move to a pid tier.. but cant’ fin dit. I was underthe impression that in Firebase Blaze plan - pay as you go,…we are already using the paid version of the gemini2.5 flash model? Please advise how to subscribe to the paid model.