Let's use AWS lambda for APIs, they're so cheap. Okay, now we also need per invocation:
- api gateway call or appsync call
- a step function transition or 2 or 20 or an express SF
- cloudwatch logging
- AWS Config entry for the step function calls (!)
- Maybe an x-ray call
- Probably a few SQS/SNS/Eventbridge calls or all of them
Cost per request is going to be a lot more than that lambda call.