//I DO NOT RECOMMEND SENDING SECRET SEEDS OVER A NETWORK (ESPECIALLY UNENCRYPTED), THIS IS JUST AN EXAMPLE OF HOW YOU MIGHT FORM AN API USING THE SDK public async Task <IActionResult> SetInflationDestination([FromBody] SetInflationDestinationRequest request) { try { Network.UseTestNetwork(); var source = KeyPair.FromAccountId(request.AccountId); var signer = KeyPair.FromSecretSeed(request.Seed); var inflationDestination = KeyPair.FromAccountId(request.InflationDestination); //For Livenet use https://horizon.stellar.org using (var server = new Server("https://horizon-testnet.stellar.org")) { AccountResponse sourceAccount = await server.Accounts.Account(source); var sequenceNumber = sourceAccount.SequenceNumber; var account = new Account(source, sequenceNumber); var operation = new SetOptionsOperation.Builder() .SetInflationDestination(inflationDestination) .SetSourceAccount(source) .Build(); var memo = Memo.Text("Sample Memo"); Transaction transaction = new Transaction.Builder(account).AddOperation(operation).AddMemo(memo).Build(); var transactionXDR = transaction.ToUnsignedEnvelopeXdr(); transaction.Sign(signer); var test = transaction.ToEnvelopeXdrBase64(); await server.SubmitTransaction(test); return(Ok()); } } catch (Exception Ex) { return(StatusCode(500, "Something went wrong")); } }