If the feedlink you are looking for is the same as your blog and you don't have that information saved anywhere, you can simply "pretend" that you want to subscribe to your RSS feed and copy the link from the address bar of your browser.
I implement professional blogs for myself and for my website clients. I've recently learned that there is something that media sites request called an API URL which is different from the number Wordpress assigns as your Askimet key. (Why in the world they use the same acronym is beyond me!) This is what media sites, like YouTube, ask for.
The endpoint reference for that is: http://yourblog.com/blog/xmlrpc.php
I'm thinking that this is what you are really looking for, based on the content of your question. The url endpoint string is dependent on how you have installed your blog on your domain, by the way. To further explain this, you may not have a "/blog/" directory on your hosting account.
Hope this helps!