There are two kinds of leads that come into a vendors product profile, free leads and leads for sale.
These come from Inventables premium users that subscribe to the site and use the sourcing tools regularly. These subscribers pay a monthly fee and therefore their inquiries are at no cost the vendor the inquiry was sent to.
Leads for Sale
These are leads that come from free basic user accounts or non-registered users. Most of these users come across the product profile pages through search engines. Inventables proprietary system calculates the market rate for the lead at the time it was submitted. The market rate is the price you will pay for the pre-qualified lead.