What do you actually mean when you talk about crypto accredited portals, are you not referring to ICO or STO , STO are very much regulated by the government and they are investment platforms where investors can invest money into a project in order to make profit in return in few months or even years, one of the popular company that carried out an STO recently is binance exchange which is the most popular crypto exchange in the world.
I don't understand the part you are talking about down payment, maybe you can throw more light on what exactly you are looking for.
Our coin fails the howey test so it isn't considered a security, however the SEC may not agree until we release the beta version of the project.
Most of the ICO/STO platforms charge significant fees to list your coin on their site. Coinlist was charging $50k last summer, now charges $20k, I'm not sure what republic charges yet but I think it's somewhere between 2k-5k upfront. They also typically charge 2-5% of the proceeds from the sale in addition to the upfront fees.