I don't really understand the debate here regarding tooling. REST, SOAP and RPC are all ways to define/codify the API and the parameters. It all goes over HTTP

I don't really understand the debate here regarding tooling. REST, SOAP and RPC are all ways to define/codify the API and the parameters. It all goes over HTTP at the end. So Curl, postman and all other HTTP-enabling tools/libraries can be used. SOAP even has handy discovery tools that frameworks can consume and construct entire APIs in most popular languages. It's just that no-one uses SOAP from a browser because XML is a royal PITA to write in JS. I would assume it's because all JS developers are too-busy writing more libraries-for and layers-over JSON.