NiceTalk is a flexible app-based Chinese company established in 2015 which has a similar type of setup that make yourself available to chinese students like Cambly, and then you and your students can make direct or random phone calls to chat. Most of their students are adult learners across China. The hourly rate to teach Chinese students is $10 USD. Normally the booking you will get depends on your ratings by students who had already learned with you. Usually, students will choose you based on your rating, so you compete with other teachers. Native English teachers with teaching certificate and teaching experience are preferred.