Do I have to pay GST/HST on cryptocurrency transactions?
From the CRA's Guide for cryptocurrency users and tax professionals:
"Where a taxable property or service is exchanged for cryptocurrency, the GST/HST that applies to the property or service is calculated based on the fair market value of the cryptocurrency at the time of the exchange.
If your business accepts cryptocurrency as payment for taxable property or services, the value of the cryptocurrency for GST/HST purposes is calculated based on its fair market value at the time of the transaction.
Keep all records that show how you calculated the fair market value."