Ask HN: What is the adaptation potential for flexible pricing merchant tools?

I am working on a project out of simple interest. I am building merchant tools and an API for flexible pricing. Basically allowing, sellers and developers be able to accept different price offers for products. Most people have taken the approach of building one single site where people can come and sell their stuff, but I want decentralize the flexibility. Allow sellers, especially creative folks who sometimes struggle with pricing structure, to simply add the option to the site and developers to embed the functionality into sites. I would like to hear people's opinions on this approach, the challenges, the pros and, if any, the potential.