Simple Endpoint (WebService) in AWS

i need simple endpoint in AWS. Situation is:

WebService <-> [AWS_COMPONENT] <-> DynamoDB

So .net WebService (which isn't in AWS) want to data from DynamoDB and ask [AWS_COMPONENT]. [AWS_COMPONENT] gets data from Database and return this data to WebService. So my question is which AWS component (solution) should be [AWS_COMPONENT].

One of ideas is that I can create [AWS_COMPONENT] as a .net Web app on EC2, but isn't overkill? Is any easier or simpler solution?