"How does the Coinbase referral program work?

Currently, if a friend of yours Coinbase clicks on your referral link, and then purchases $100* worth of bitcoin, you and your friend will each receive a bonus of $10* worth of bitcoin. Full details are here68.

*Amounts will be denominated in local currencie, ie. bonus of 10 € for a buy 100 € "
https://community.coinbase.com/t/frequently-asked-questions/8487#referral