Joining and starting a classroom on Teaching.Exchange is free. There are three basic selling fees: an item fee, a transaction fee, and a payment processing fee.

There are no monthly fees. There are no Yearly Fees. No Per Transaction Flat fee. Just a simple 20% per sale fee. Once an item sells, there is a 2.9% + 30c (3.9% outside of the U.S.) transaction fee on the sale price (not including shipping costs if there are any) which is placed by the credit card processor and not Teaching.Exchange. If you accept payments with PayPal, there is also a payment processing fee based on their fee structure. PayPal features may not be enabled for all sellers.  In order to unlock PayPal as a payment method, you must do at least $20,000+ per month in gross sales.

All fees are listed in USD.  If you are not located in the United States or use a different currency, there will be an addition currency conversion fee and rate for the amount you make. (Again, this is something determined by the payment processor and not Teaching.Exchange)