So, if you really are this price sensitive, here's a flip-side. I built a simple email verification service for A company I used to work for. Used API gateway,

So, if you really are this price sensitive, here's a flip-side. I built a simple email verification service for A company I used to work for. Used API gateway, lambda, s3, and sqs. Few thousand users a month. I don't need to maintain it, check for security updates etc. The monthly bill for all that was ~$2 NZD.