Since we have teachers and students from over 100 countries, it's confusing to talk in individual currencies when talking to everybody. Therefore, we use a common currency "TeacherOn coins" or just "coins" for all kinds of transactions. 1 coin is approx $0.015. You can view the price for your local currency on Buy coins page when logged in.
Students use coins to contact teachers. Please see details on How it works for students.
We feel it's unethical to force you to spend coins on jobs you don't want. This leads to a bad experience for you and the students you contact. Therefore, the coins never expire. We believe this will allow you to use coins at the pace you are comfortable with to contact only the relevant students.
We don't do gimmicks or flash sales. That's because we believe you should buy coins only if you have faith in the value you get, not because of some fake urgency. However, you can get up to 50% discount depending on how many coins you buy.