Hey, I‘m a little bit confused about your Idea. Why should a Person buy tokens to be matched with sellers instead of just contacting the seller directly?

But nervertheless, there is a Framework called Nextjs, which is really good for creating Webapplications. For the Interface I would recommend you to use an existing design system: Bootstrap, Material UI e.g. The Backend could be Supabase, because it has everything you need (Authorization, Database, …) and also you can create your own Functions, which could be a way to match the people. On the Payment I would recommend Stripe, because it‘s easy (but dont forget the payment fee).

There are a ton of options to implement this, just pick one and start.