Skip to content
Polkadart

Connecting to a network

After you have installed Polkadart and generated the types, you can now connect to a network and start querying the chain.

Using Provider and the generated API

Let’s create a sample application together, inside bin/demo.dart let’s add the following code:

demo.dart
import 'package:demo/generated/polkadot/polkadot.dart';
import 'package:polkadart/provider.dart';


Future<void> main(List<String> arguments) async {
  final provider = Provider.fromUri(Uri.parse('wss://rpc.polkadot.io'));
  final polkadot = Polkadot(provider);


  final query = await polkadot.rpc.state.getRuntimeVersion();
  print(query.toJson());
}

Now you can run your application:

Terminal window
dart run bin/demo.dart

You should see the runtime version of the Polkadot chain.

{
  specName: polkadot,
  implName: parity-polkadot,
  authoringVersion: 0,
  specVersion: 1003003,
  implVersion: 0,
  apis: [...],
  transactionVersion: 26,
  stateVersion: 1
}

You have now successfully connected to a Polkadot and made your first query to the chain! 🚀