Get a Bitcoin Lighting Wallet
First you'll need a Bitcoin Lightning wallet that lets you send Bitcoin over the Lightning Network. For the quickest and most simple mobile experience, we recommend Blue Wallet as it has a really clean interface and you can buy Bitcoin within the app. You can also use other money apps like CashApp and Strike.
Create a Lightning invoice
Make sure your Bitcoin Lightning wallet has enough funds for the amount you wish to top up. Open Fountain and go to your Wallet. Press "Add Funds" and choose the amount you wish to deposit to generate an invoice address.
Pay the Lightning invoice
Copy the invoice address and then open your Bitcoin Lightning Wallet to complete the transaction (it should appear automatically). Once it’s been processed, your Fountain balance will be updated and the payment will appear in the Transactions tab.