stellar_flutter_sdk 3.1.0

A Stellar SDK for Flutter, that can query Horizon and Soroban RPC, build, signs and submit transactions to Stellar. Supports many SEPs and can deploy and invoke Soroban Contracts.

Stellar SDK for Flutter

Build and sign Stellar transactions, query Horizon, and interact with Soroban smart contracts via RPC. Communicate with anchors and external services using built-in support for 18 SEPs.

Installation

dependencies:
  stellar_flutter_sdk: ^3.1.0

flutter pub get

Requires Dart SDK >=3.8.0 <4.0.0 and Flutter >=3.32.0.

iOS

Set your app's iOS deployment target to 15.0 or higher (platform :ios, '15.0' in ios/Podfile, and the Xcode project's iOS Deployment Target). Smart account passkey features additionally require iOS 16 at runtime; on iOS 15 those calls return a not-supported result while the rest of the SDK works normally.

Quick examples

Send a payment

Transfer XLM between accounts:

import 'package:stellar_flutter_sdk/stellar_flutter_sdk.dart';

Transaction transaction = TransactionBuilder(senderAccount)
    .addOperation(PaymentOperationBuilder(receiverId, Asset.NATIVE, '100').build())
    .build();
transaction.sign(senderKeyPair, Network.TESTNET);
await sdk.submitTransaction(transaction);

Trust an asset

Enable your account to receive a token (like USDC):

Asset usdc = Asset.createNonNativeAsset('USDC', issuerAccountId);
Transaction transaction = TransactionBuilder(account)
    .addOperation(ChangeTrustOperationBuilder(usdc, ChangeTrustOperationBuilder.MAX_LIMIT).build())
    .build();
transaction.sign(accountKeyPair, Network.TESTNET);
await sdk.submitTransaction(transaction);

Call a smart contract

Invoke a Soroban contract method:

SorobanClient client = await SorobanClient.forClientOptions(
    options: ClientOptions(
        sourceAccountKeyPair: keyPair,
        contractId: 'CABC...',
        network: Network.TESTNET,
        rpcUrl: 'https://soroban-testnet.stellar.org',
    ),
);
XdrSCVal result = await client.invokeMethod(name: 'hello', args: [XdrSCVal.forSymbol('World')]);

For complete walkthroughs, see the documentation.

Agent Skill

This repository includes an Agent Skill that teaches AI coding agents how to use this SDK. See skills/ for installation instructions.

Documentation

Guide	Description
Quick start	Your first transaction in 15 minutes
Getting started	Keys, accounts, and fundamentals
SDK usage	Transactions, operations, Horizon queries, streaming
Soroban	Smart contract deployment and interaction
Smart Accounts	OpenZeppelin smart account support: passkeys, multi-signer authorization, context rules, policies
SEPs	Anchor integration, authentication, KYC, etc.

Smart Accounts (Passkey) support

This SDK ships first-class support for OpenZeppelin smart accounts on Stellar: WebAuthn passkey authentication on iOS, Android, and Web; multi-signer authorization; on-chain context rules; and policy contracts (threshold, weighted threshold, spending limit). An optional fee-bump relayer and credential indexer integrate transparently.

See the Smart Accounts documentation for an overview, the developer onboarding guide for conceptual material, the API reference for every public symbol, and the per-platform WebAuthn setup guides: iOS, Android, Web. For a runnable reference implementation, see the demo app.

Web Support

Starting with version 3.0.0, this SDK fully supports Flutter web. All 64-bit integer types have been migrated to BigInt to address JavaScript's 53-bit number precision limitation.

If you are upgrading from version 2.x, please refer to the Migration Guide for details on breaking changes and how to update your code.

Compatibility

• Horizon API compatibility matrix
• RPC API compatibility matrix
• SEP support matrices

Feedback

If you're using this SDK, feedback helps improve it:

• Report a bug
• Request a feature
• Start a discussion

Contributing

See CONTRIBUTING.md for guidelines.