Given the definition of a microservices as being a 'Small, autonomous independently deployable services that work together', I would say a set of web services which are independently deployable fits the bill. Web service APIs are frequently used as a set of comms between services.
SOAP though is dying out. You'll see more REST over HTTP (or HTTP-comms pretending to be REST) than you will SOAP. This isn't a microservice trend - it's an industry wide trend!
