How to perform a REST request after a node created using rules?
Guzzle is similar to Web Service Client and there is also Web Rules but I assume Guzzle would require some coding. Guzzle is a powerful HTTP client and library and itself can do whatever you want.

The reason there are few user interfaces to what you want is that they're annoying to build and add next to nothing to your client website. The UIs dont make the website any faster, they're just bloat.

This is why Views and ViewsUI are decoupled so you can turn 1 off in production environments.