Where does Web API fit in a typical n-tier architecture?

Question

Usually when i layout an n-tier architecture for a project I have the following layers:

• Domain (domain model, repository contracts)
• <

Answer 1

There are two possibilities

• Middle-tier or middleware: this is where typically web services and WCF Services have been working. Using REST is much lighter than SOAP so this is de-facto use case. Web and WCF services are better in respect to client generation but Web API will gradually catch up.
• Presentation layer: this will provide data to the Single-Page-Applications or any modern web site/application that uses data and renders on the client.