Here's my 2 cents and some thought questions that will hopefully help you find your way: You've received positive feedback from several people but are they your target market? Will they be the ones paying? It's also important to think about what value you're bringing to the table.

If you're targeting single-page apps, you'll have to seek those customers out. If you're targeting websites who want to get indexed on Google, SEO-related, etc, then your customer base will be bigger. Seek them out.

As a previous poster had already mentioned, if I'm competent enough to build a single-page app, I could easily manage my own redirects. Unless I have more than 100 single-page apps, then I might see value in your service.

Communicate what your value is to me and how you're saving/giving me money/time/something by taking money away from myself.