GoCatch is offering a free rideshare between 6AM-9AM this week in Melbourne. All you have to do is request a GoCatch Rideshare between 6am and 9am (no code needed).
Screenshot of Email from GoCatch
This is most beneficial for existing users. If you are a new user, then sign up with RIDEMEL20 which I think is still valid. If that fails then a referral I suppose will allow you to use credit on a Go Catch taxi or rideshare. You can't combine both.
Also not sure if you can collect $5 credit but may as well give it a whirl.
GoCatch doesn't have surge pricing. Pricing
Rides are free up to the value of $30. Only valid on GoCatch Rideshare trips. One free trip per passenger. Offer only valid between hours of 0600 - 0900 Monday, December 12 to Friday, December 16. An eligible payment method must be entered into your GoCatch account in-app in order to request a GoCatch Rideshare. To enter a payment method in-app, tap Menu, select Account and then Payment Method.
They had a similar promotion when they launched in Brisbane which is when I signed up. My first ride was during the promotion period and was free and didn't use up the referral credit.