You can send Bitcoin donations to the following address to support this project:
Using a low fee is recommended, since the payment doesn't need to be quick. There's no need to waste your money choosing a fee based on having it arrive within an hour, when having it go through within a couple days is perfectly fine.
PayPal donations can be sent to email@example.com. Please mention GrapheneOS in the donation description to allow for proper record keeping, since PayPal does not allow multiple personal accounts.