​
Sign messages

Sign messages on an external browser. 
Chain chain = Chain.TestnetAbitrumSepolia;
string message = "Your message to sign.";

SignMessageResponse response = await wallet.SignMessage(chain, message);
string signature = response.signature;

​
Send transactions

Send transactions without paying for gas fees on any testnet or when using Gas Sponsorship. 
Chain chain = Chain.TestnetAbitrumSepolia;
Address to = new Address("0x33985d320809E26274a72E03268c8a29927Bc6dA");

ITransaction[] transactions = new Transaction[]
{
    new Transaction(to, 0, "implicitEmit()"),
    new Transaction(to, 0, "explicitEmit()")
};

string txnHash = await wallet.SendTransaction(chain, transactions);

​
Send transactions using Fee Options

Get available fee options for the user and choose one to use when sending the transaction. 
Chain chain = Chain.TestnetAbitrumSepolia;
Address to = new Address("0x33985d320809E26274a72E03268c8a29927Bc6dA");

ITransaction[] transactions = new Transaction[]
{
    new Transaction(to, 0, "implicitEmit()"),
    new Transaction(to, 0, "explicitEmit()")
};

FeeOption[] feeOptions = await _wallet.GetFeeOption(chain, transactions);
FeeOption feeOption = feeOptions[0]; // Choose a way to select the appropriate option

string txnHash = await wallet.SendTransaction(chain, transactions, feeOption);

​
Check if your wallet supports a transaction

You can do the same call for multiple transactions at once if you pass in a Transactions[] array. 
Chain chain = Chain.TestnetAbitrumSepolia;
Address to = new Address("0x33985d320809E26274a72E03268c8a29927Bc6dA");
ITransaction transaction = new Transaction(to, 0, "implicitEmit()");

bool supported = await wallet.SupportsTransaction(chain, transaction);