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AWS Certified Solutions Architect - Professional · AWS
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Even though method-level throttling (Option D) could explain 429s, the key detail here is that 429 errors are happening across multiple API methods and Regions. This points to the API Gateway account-level limit on requests per second, which is shared across all deployed methods and stages in a Region. If total API traffic from premium-tier customers exceeds this account-level RPS limit, API Gateway returns 429s without invoking the Lambda — exactly what the question describes.
"they receive error responses of 429 Too Many Requests from multiple API methods" Error are not coming from all API calls but from multiple API methods D looks correct
API Gateway enforces a default per-method limit of 1,000 RPS (requests per second). Since premium customers require up to 3,000 RPS, they would exceed this limit, leading to 429 errors.