nostr:nprofile1qqs22d4tralncqfnh2kmmarjkxk8449hwnk5xtqe3y5yry6hy7ytegqpz4mhxue69uhhyetvv9ujuerpd46hxtnfduhsz9mhwden5te0wfjkccte9ehx7um5wghxjmnxduhsquze4f is free, but as you probably know, nothing is really free. The tradeoff is that with btcpayserver, you need time and expertise to run it yourself.