There are a lot of startups trying to intermediate between small businesses and customers. They often start by providing customers for your business, and then will try to add more value-add tools into your pipeline, so that you are dependent on them (things like ecommerce platforms, CRMs, etc)

As a small business, work with them at your own risk - they promise to drive demand to your business but will take your margin as well since you won't have a relationship with your customers.