I spent a couple of minutes looking over the link you provided. Here's my honest feedback.
- I wasn't able to immediately understand what the point of the application from your description (both here and on the site itself). If I can't understand it immediately, it's unlikely I'm going to use it. Eventually I was able to understand (as best I could, I'm still not sure) that it's for sending other people a link to your profile, so you can show them a list of other websites related to you (with a description).
- The audience would have to be users with: more than one link they want to send (otherwise they would just communicate their own link directly); relatively low tech skills (or else they might just build their own website with similar functionality that they have complete control of); and people who feel a repository of links and descriptions to send to other people would be beneficial. This seems to me a very specific audience that I'm not sure is large enough to merit solving a problem for (if your goal is a sustainable company).
- I'm not sure of the cost-benefit of your application to the end users. I'm not the audience of your application, but this doesn't strike me as something I would use if I was in your target audience.
- What's your end goal? To make money, as you're asking about pricing structures? Then it's unlikely a dollar or a pay-what-you-can model is going to get you far. Users won't directly financially benefit from your service, so I don't see users thinking "I should pay that application back for the benefit it provides".
- Personally, the website is visually unappealing, which detracts from my hypothetical willingness to use it. I don't like the straight black background, and the content doesn't flow well on my desktop browser.
I hope this was helpful to you.