Have you built anything using this yourself?
- simple todo/link collection bot with telegram custom keyboard
- markdown from pdf message
- bot that returns top 5 posts on hn
- simple settlement bot
- friend manage to build a bot that after getting a url to recipe generated image about it
- "cookie clicker" app
- basic shop app
I think the main reason people prefer making chat bots in Telegram is that it's completely free and unlimited, i.e. you can create any number of chat bots, send any number of messages with attached files of any size. Their API is very easy to use too.
regarding pricing: mostly number of messages per month/ number of bots
- free: 10 msg, 2 bots
- starter: 50 msg, 5 bots - 10$/month
- developer: 100 msg, 10 bots - 20$/month
- pro: 250 msg, 20 bots, voice messages - 50$/month
- scale: 500msg, 40bots, voice messages - 100$/month