Yup, that's exactly how I recommend clients to write lambdas for API purposes... Such a great balance of getting per request pricing while retaining all existing tooling for building APIs
For an internal API with one or two endpoints, I‘ll do things the native Lambda way. Your standard frameworks are heavy when all you need to do is respond to one or two events and you can do your own routing, use APIGW and API Key for authorization, etc.
There is also a threshold between “A group of developers will be developing this API and type safety would be nice so let’s use C#” and “I can write and debug this entire 20-50 line thing in the web console in Python, configure it using the GUI, and export a SAM CloudFormation template for our deployment pipeline.”
There is also a threshold between “A group of developers will be developing this API and type safety would be nice so let’s use C#” and “I can write and debug this entire 20-50 line thing in the web console in Python, configure it using the GUI, and export a SAM CloudFormation template for our deployment pipeline.”