Getting News articles using REST API

[APJ10]

Hello, We have a site for newsroom, where we are displaying all news articles. I need to create a rest API to read this information and display it on our REACT based app. I am unable to get hold of a URL that would provider me with this Information. 
I have tried following URLS but I am not getting the desired results

• https://<tenant>.sharepoint.com/sites/iNewsroom/_api/Web/Lists/getByTitle('Site%20Pages')/items?$sel...
• https://<tenant>.sharepoint.com/_api/search/query?querytext=%27IsDocument:True%20AND%20FileExtension...
• https://<tenant>.sharepoint.com/search/_api/search/query?querytext=%27IsDocument:True%20AND%20FileEx...\

Is there any other URL I can try to get the information? The newsroom site has a few sitep