Hello, I met the same 429 ERROR while I was posting requests based on model “gemini-embedding-exp-03-07”. But I RESOLVED IT !!! The solution is so simple, you just need to limit your requests under 5 per minute and no more than 100 requests per day since the quota is this.
You can find quota details in the page: https://ai.google.dev/gemini-api/docs/rate-limits