Ty the one I run - https://nostr.ownbtc.online - Yes the payment does take a bit of time to go through. Any doubts reach out to me.

fluidtrack

There was also this post in the past week, which may have additional candidates:

*Nostr Paid Relays* 
https://stacker.news/items/142054

cryptocoin

My connection has been bad lately so I wanted to go for a paid one.  I saw someone post a couple weeks ago the relays the connected to.  They highlighted the paid ones.  I picked one, went to the website, paid the 6969 sats... and it never accepted my payment, it just said "waiting on payment" and then after 5 minutes it said invoice expired.

It was Nostr.plebchain.org just so everyone knows.

I'll find a reputable one here though.