Privy supports Solana clusters such as Mainnet Beta, Devnet, and Testnet. To configure RPC endpoints for Solana when using the Privy embedded wallet UIs (UI signTransaction and signAndSendTransaction), set RPC clients under the config.solana.rpcs prop of the PrivyProvider: 
<PrivyProvider
  appId="your-privy-app-id"
  config={{
    ...theRestOfYourConfig,
    solana: {
      rpcs: {
        'solana:mainnet': {
          rpc: createSolanaRpc('https://api.mainnet-beta.solana.com'),
          rpcSubscriptions: createSolanaRpcSubscriptions('wss://api.mainnet-beta.solana.com')
        },
        'solana:devnet': {
          rpc: createSolanaRpc('https://api.devnet.solana.com'),
          rpcSubscriptions: createSolanaRpcSubscriptions('wss://api.devnet.solana.com')
        }
      }
    }
  }}
>
  {/* your app's content */}
</PrivyProvider>
The config.solana.rpcs configuration is only required for Privy’s embedded wallet UIs. If you are using external Solana wallets (e.g., Phantom, Solflare) without embedded wallet UIs, you do not need to set config.solana.rpcs.

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Custom Solana Virtual Machine (SVM) networks

In addition to supporting transactions on Solana mainnet, devnet, and testnet, Privy also supports sending transactions on any blockchain that implements the Solana Virtual Machine (SVM). You can send a transaction on a custom SVM by initializing the Connection instance for your transaction with the RPC URL for the SVM, like so: 
// Initialize connection instance with custom SVM RPC URL
let connection = new Connection('insert-custom-SVM-rpc-url');

// Build out the transaction object for your desired program
// https://solana-foundation.github.io/solana-web3.js/classes/Transaction.html
let transaction = new Transaction();

// Send transaction on custom SVM
console.log(await wallet.sendTransaction!(transaction, connection));