Is there a way to combine Web and API tests?

Lets take a scenario like… Create a User using APIs and verify the created user from Web-UI.

Of course there is. Just combine WebUI and WS keywords in a test case.
See documentation for both Keyword types:

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I have made an example of using WebUI.* and WS.* keywords together in a test case. Have a look at the following post:

Thanks for your quick response @kazurayam and @Marek_Melocik.