QRYPTOS products that are available for trading can be found in the Markets page. Any trading pairs you have in mind but can't find on Markets have been disabled due to market volatility, or are unsupported.
For the inner coder in all of us, an always-up-to-date list of minimum withdrawal amount of all currencies on QRYPTOS is offered at https://api.qryptos.com/products. This page displays a JSON file (example below) and can look very confusing to non-techies. It is recommended that you install a JSON viewer add-on or extension to your browser for a prettier format.