Robinhood - Free stock trading service.

Paytiko - Advanced payment management software

TradeStation - Whether you trade stocks, ETFs, options or futures, TradeStation’s award-winning tools and...

PayPal - PayPal is the faster, safer way to pay online without sharing financial details, send and receive money or accept credit and debit cards as a seller

OptionsHouse - OptionsHouse is an online stock trading platform with an easy-to-use interface.

Braintree - An all-in-one solution to accept, process, and split payments in your mobile app or online - from small business to large enterprise.