Hence, there is no personal contact between traders. Robinhood is mobile first and just recently added a Web version, so it is best for people comfortable managing money from their phone or tablet. Includes 1. Note, however, due to the lack of a third party or matchmaking algorithm, there is a greater risk that the seller may not pay. So, if you want to sell bitcoins on a P2P service, you will have to look for a seller that is offering your desired amount of bitcoins at a price that you are willing to pay. Generally speaking, exchanges have lower fees than brokerage services.