You will get up to 10.5% back. It depends on the product, but it will the max rate they declare for their affiliate program. The exact cashback rate will depend on type of products you buy and your customer status (sometimes you can get back more as a new customer). Please check AliExpress shop page on monetha.io to learn more about its cashback terms.
Yes! After the deposit period (you may choose 2, 7, or 15 days) you will get your $MTH back. A small fee will be deducted to cover the “gas price” (cost of transaction on Etherium network).