FreshRSS is a free, open source, reliable and ergonomic service with web interface (which is usable on mobile) and API for mobile apps.
I've set up news.decent.im to use it myself and share it with others.
As with the XMPP service, I use it daily and I like it very much.
Take a look at my own selection of news sources to get a taste.
Submit the payment and details.
If we know each other, or your work in public interest is known to me, please contact me to request an account for free.