https://t.me/GReaderBot
(source: https://github.com/nikstar/greader/commit/76135a313010c92802c52989edbb125bd599bbe1)

@GReaderBot - Lightweight RSS bot for Telegram. Mini app allows users to quickly manage their subscriptions

Mini app is a small addition to existing RSS bot but I think it added significant value. See short video demo here https://t.me/miniappdemo