More info from policy updates:
Bank Account Funding for Canada
Notice Date: September 8, 2003
Effective Date: October 10, 2003
Effective October 10, 2003, users will be able to fund their PayPal accounts with a Canadian Dollar-denominated Canadian bank account. This functionality may be enabled by adding and confirming ownership of a bank account. There is no fee to transfer funds into a PayPal account.