When it's relevant to the conversation, I mention and link to my side project. I used to just mention it, not wanting to be seen as spammy, but I kept getting r

When it's relevant to the conversation, I mention and link to my side project. I used to just mention it, not wanting to be seen as spammy, but I kept getting replies saying I should link, too. So I've kind of gotten over that. And usually when I do so, again, provided it's relevant to the conversation, I get a lot of traffic, which sometimes translates into a few sales. I think that, provided you are indeed contributing to the conversation, and what you're linking to us genuinely helpful and relevant, people on HN are usually pretty accepting of you promoting it occasionally.