21
Jun
2026
Fix Gemini API Error 429: Quota Exceeded on Free Tier (System.InvalidOperationException)
Getting System.InvalidOperationException with Gemini API Error 429 (Quota Exceeded) on the Free Tier? You're not alone! This blog explains why this happens, covers free tier rate limits, and shows you how to fix it fast with retry logic, best practices, and tips on using image models in Gemini free tier.