Currently, we only support Tradier. To use Options Cafe you will need an account with Tradier. If you're not familiar with Tradier we highly suggest you check them out. They have some of the cheapest prices in the industry with some of the best customer support.
We are actively considering adding other brokers to the platform. If there is a broker you really want to use please send us a note to support. Or tweet at us (a little public pressure goes a long way).