Why is rent not paid and tracked online?

In the US?

This has to vary per country. Here in the UK I think usually you set up a standing order, that is an automatic scheduled bank transfer for a set amount every month. You can do that online and these days the transfer is instant, and it does not require any third party services or fees.

I had this at an apartment once. They were a large enough company that they did this and it was great. Now I have to mail a check to my current one. It's a shame, but probably is related to scale.

I assume that you can for some landlords. I might be in the minority, but I can track and pay my mortgage online; I don't see why it's impossible for rent payments.

My guess is that it's a combination of ignorance, apathy, and credit card fees.

So somebody else can scrape a little rent off the top?