Einstein is a crypto app that you can buy/sell crypto. The sign-up bonus is $7.50 ( after you convert the CAD bonus to USD) and $7.50 per verified referral.
Stash is an investing app that will allow you to invest starting at $5. In order to get the $5 sign up bonus, you would have to make a deposit of at least $5 into your investing account. Earn $5 per referral.