It may vary depending on the client nostr:nprofile1qqs034ppyjnjakycjcj84kgj737aw6kxkmxazrlp0r67qjk0atgdfgspz4mhxue69uhhyetvv9ujuerpd46hxtnfduhszythwden5te0dehhxarj9emkjmn99usy20wr is using at the moment of the creation of the post.

It is a great knowledge for him and others who didn't know about it yet, though.

You can either pay for those who answer it or charge for the answer.