In the Web service context the term endpoint received a formal definition with the W3C recommendation "WSDL 2.0" of 2007,[1] The term "endpoint interface" is more specific about "how to implement the endpoint", for example by an OpenAPI specification or by WSDL specification.
The old (2004) term "end point" received also a glossary definition:[2] A SOAP-based web service can be implemented as a single Java class.
It is annotated with @WebService and is a component interface, which declares all the abstract methods that are exposed to the client.
The only methods of the bean that may be invoked by a Web service client are the business methods that are defined in the Web service endpoint interface.
The methods of an endpoint interface for a Web service are implemented in a session bean class that is stateless.