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by koblas 1604 days ago
If you go with the authors original description that the lambda function for handling orders is small and fast. Probably a bunch of server side validation before stuffing in DynamoDB or maybe into a queue (Message Queues / Kafka). We can assume that the program is small and fast.

If you saw 300,000,000 requests in the month on a 256MB lambda function and 500ms of runtime. It would only cost $678 for the order capture. Maybe my math is wrong here, but not huge in my book.