Build powerful blockchain applications with type-safe Dart & Flutter
Get started in minutes • Perfect for Flutter apps • Production ready
Polkadart is a comprehensive Dart/Flutter SDK that provides everything you need to build decentralized applications on Polkadot, Substrate, and other compatible blockchain networks. With type-safe APIs, automatic code generation, and Flutter-first design, it's the most developer-friendly way to integrate blockchain functionality into your Dart applications.
This library is funded by Web3 Foundation via their Open Grants Program
🚀 Developer-First Experience
- Type-Safe Everything: Auto-generated types from chain metadata ensure compile-time safety
- Flutter Ready: Built from the ground up for mobile and cross-platform development
- Intuitive APIs: Clean, idiomatic Dart interfaces that feel natural to use
- Comprehensive Docs: Extensive documentation with real-world examples
⚡ Feature Complete
- Universal Compatibility: Works with any Substrate-based blockchain
- Smart Contracts: Full support for ink! smart contract interactions
- Real-time Subscriptions: WebSocket support for live blockchain data
- Complete Cryptography: All signature schemes (sr25519, ed25519, ecdsa) included
- Advanced Features: Batch transactions, multi-sig, custom RPCs, and more
🔒 Production Ready
- Battle-Tested: Powers production wallets and dApps with millions of transactions
- High Performance: Optimized SCALE codec with minimal overhead
- Security First: Comprehensive key management and secure signing
- Active Maintenance: Regular updates and active community support
- Web3 Foundation Backed: Official grant recipient ensuring long-term sustainability
dependencies:
polkadart: ^0.7.0
polkadart_keyring: ^0.7.0import 'package:polkadart/polkadart.dart';
// Connect to Polkadot
final provider = Provider.fromUri(Uri.parse('wss://rpc.polkadot.io'));
final api = await ApiPromise.create(provider);
// Query account balance
final account = '15oF4uVJwmo4TdGW7VfQxNLavjCXviqxT9S1MgbjMNHr6Sp5';
final balance = await api.query.system.account(account);
print('Free balance: ${balance.data.free}');import 'package:polkadart_keyring/polkadart_keyring.dart';
// Create a wallet
final keyring = Keyring();
final alice = await keyring.fromMnemonic('//Alice');
// Send a transfer
final tx = api.tx.balances.transfer(
dest: '14E5nqKAp3oAJcmzgZhUD2RcptBeUBScxKHgJKU4HPNcKVf3',
value: BigInt.from(10).pow(12), // 1 DOT
);
final hash = await tx.signAndSend(alice);
print('Transaction hash: $hash');This repository is a monorepo containing the complete Polkadart ecosystem:
| Package | Description | Version |
|---|---|---|
| polkadart | Main SDK for Substrate/Polkadot interaction |  |
| polkadart_keyring | Key management and account handling |  |
| Package | Description | Version |
|---|---|---|
| polkadart_cli | Generate typed APIs from chain metadata |  |
| ink_cli | Generate typed interfaces for smart contracts |  |
| Package | Description | Version |
|---|---|---|
| polkadart_scale_codec | SCALE codec implementation |  |
| substrate_metadata | Runtime metadata parsing |  |
| ink_abi | ink! ABI encoding/decoding |  |
| Package | Description | Version |
|---|---|---|
| sr25519 | Schnorrkel signature scheme |  |
| secp256k1_ecdsa | ECDSA operations |  |
| ss58 | SS58 address encoding |  |
| substrate_bip39 | BIP39 mnemonic generation |  |
Getting Started
Advanced Topics
Package Documentation
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We welcome contributions from developers of all skill levels! Here's how you can help:
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Every contribution matters! Check our Contributing Guide for details.
A heartfelt thank you to all the amazing contributors who have helped build Polkadart! emoji key
This project follows the all-contributors specification. Contributions of any kind welcome! ❤️
This project is licensed under the Apache 2.0 License
Ready to build your next blockchain application? Here's where to go:
- 📖 Read the Documentation - Complete guides and tutorials
- 💻 Explore Examples - Working code samples
- 💬 Join the Community - Get help and share ideas
- ⭐ Star the Project - Show your support!
Build the future of Web3 with Dart & Flutter 🚀