Rollbit Casino is a cryptocurrency mobile casino, meaning you can use digital currencies only to fund your account. It is also possible to use NFTs to make a deposit, but you will be required to associate your MetaMask wallet with Rollbit Casino. For that purpose, you have to sign a message, and the mobile casino will recognize the MetaMask wallet. After that, find the preferred NFT and tap on the Deposit button. The last step is to approve the payment from your MetaMask wallet.