Url Limit per Website
There is a limit of 150,000 urls per website. People are searching for the products you sell, so you should be using your robots.txt file to filter out all urls other than your product categories and the products themselves.
Ideally you should be using XML sitemaps which only contain links to all of the products that you sell. Our indexing robots will not extract links from your website pages if you are using XML sitemaps, they only get links from the sitemaps, so this allows you to have more freedom about your website design and reduces the amount of hits your website gets from our indexing robots.
If you are selling more than 150,000 products in your website, then the url limit for your website will be increased automatically if you are using XML sitemaps.