You earn $50 for every group of 3 friends who each spend $200 with their Oobit card within 60 days of entering your code.
There's no limit. Each new group of 3 qualified friends earns you another $50.
The reward is paid into your Oobit account in USDT, or in USDC where USDT isn't available, such as in the EU. The amount is set in US dollars, so $50 is paid as the equivalent in the stablecoin at the time of payout.