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Para Class

The Para class is the main entry point for the Para Flutter SDK, providing wallet operations, authentication, and blockchain interactions. The latest version includes passkey authentication, comprehensive multi-chain support, and deep linking capabilities.

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Constructor

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Para.fromConfig()
Constructor
Creates a new Para SDK instance using the v2 factory constructor.
final para = Para.fromConfig(
  config: ParaConfig(
    environment: Environment.beta,
    apiKey: 'YOUR_API_KEY',
    jsBridgeUri: Uri.parse('custom-bridge-url'), // Optional
    relyingPartyId: 'custom.domain.com',         // Optional
  ),
  appScheme: 'yourapp',
);

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Authentication Methods

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initiateAuthFlow()
Future<AuthState>
Initiates authentication flow for email or phone. Returns an AuthState indicating next steps.
// Email authentication
final authState = await para.initiateAuthFlow(
  auth: Auth.email('user@example.com')
);

// Phone authentication
final authState = await para.initiateAuthFlow(
  auth: Auth.phone('+1234567890')
);
​
verifyOtp()
Future<AuthState>
Verifies the OTP code sent to email/phone during authentication.
final verifiedState = await para.verifyOtp(
  otp: '123456'
);
​
handleLogin()
Future<Wallet>
Handles login for existing users with passkey authentication.
final wallet = await para.handleLogin(
  authState: authState,
);
​
handleSignup()
Future<Wallet>
Handles the complete signup flow for new users, including passkey creation and wallet setup.
final wallet = await para.handleSignup(
  authState: authState,
  method: SignupMethod.passkey,
);
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verifyOAuth()
Future<AuthState>
Handles complete OAuth authentication flow using an external browser.
final authState = await para.verifyOAuth(
  provider: OAuthMethod.google,
  appScheme: 'yourapp',
);

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Wallet Management

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createWallet()
ParaFuture<Wallet>
Creates a new wallet with enhanced multi-chain support. Returns a ParaFuture that can be cancelled.
final walletFuture = para.createWallet(
  type: WalletType.evm,
  skipDistribute: false,
);

final wallet = await walletFuture.future;
// Or cancel: await para.cancelOperationById(walletFuture.requestId);
​
fetchWallets()
ParaFuture<List<Wallet>>
Retrieves all wallets for the current user.
final walletsFuture = para.fetchWallets();
final wallets = await walletsFuture.future;

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Signing Operations

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signMessage()
ParaFuture<SignatureResult>
Signs a message with the specified wallet. Returns a cancellable ParaFuture.
// Generic message signing
final signatureFuture = para.signMessage(
  walletId: wallet.id,
  messageBase64: base64Encode(utf8.encode('Hello, Para!')),
);

final signature = await signatureFuture.future;

// Cosmos transaction signing
final cosmosSignature = await para.signMessage(
  walletId: cosmosWallet.id,
  messageBase64: '', // Not used for Cosmos
  cosmosSignDocBase64: base64Encode(utf8.encode(jsonEncode(signDoc))),
).future;
​
signTransaction()
ParaFuture<SignatureResult>
Signs an EVM transaction. Returns a cancellable ParaFuture.
This method is for EVM transactions only. For Solana, use signMessage() with the serialized transaction as messageBase64. For Cosmos, use signMessage() with cosmosSignDocBase64.EVM Transaction Return Value: The SuccessfulSignatureResult contains the complete RLP-encoded transaction ready for broadcasting via the signedTransaction property.Solana/Cosmos Return Value: For pre-serialized transactions, returns just the signature in signedTransaction. For constructed transactions, returns the complete signed transaction.
// EVM transaction signing
final signatureFuture = para.signTransaction(
  walletId: evmWallet.id,
  rlpEncodedTxBase64: base64Encode(rlpEncodedTx),
  chainId: '1', // Ethereum mainnet
);

final signature = await signatureFuture.future;
​
cancelOperationById()
Future<void>
Cancels an ongoing operation by its request ID.
final signatureFuture = para.signMessage(...);
// Cancel the operation
await para.cancelOperationById(signatureFuture.requestId);

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Session Management

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isSessionActive()
ParaFuture<bool>
Checks if there’s an active user session.
final isActive = await para.isSessionActive().future;
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exportSession()
ParaFuture<String>
Exports the current session as an encrypted string.
final sessionData = await para.exportSession().future;
// Save sessionData securely
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logout()
ParaFuture<void>
Logs out the current user and clears session data.
await para.logout().future;

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Utility Methods

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getCurrentUserAuthDetails()
ParaFuture<AuthState?>
Gets the current user’s authentication details.
final authDetails = await para.getCurrentUserAuthDetails().future;
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waitForLogin()
ParaFuture<Map<String, dynamic>>
Waits for an ongoing login operation to complete.
final result = await para.waitForLogin(
  pollingIntervalMs: 1000,
).future;
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waitForWalletCreation()
ParaFuture<Map<String, dynamic>>
Waits for wallet creation to complete after signup.
final result = await para.waitForWalletCreation(
  pollingIntervalMs: 1000,
).future;
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formatPhoneNumber()
String?
Formats a phone number for authentication.
final formatted = para.formatPhoneNumber('1234567890', '1');
// Returns: '+11234567890' (exact format depends on implementation)
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isUsingExternalWallet()
ParaFuture<bool>
Checks if the current user is using an external wallet.
final isExternal = await para.isUsingExternalWallet().future;
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clearStorage()
ParaFuture<void>
Clears local storage data.
await para.clearStorage(false).future;
​
dispose()
void
Disposes of SDK resources. Call when the SDK is no longer needed.
para.dispose();

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Extension Methods

Para provides extension methods for cleaner authentication flows (requires importing extensions): 
import 'package:para/src/auth_extensions.dart';

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ParaAuthExtensions

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initiateAuthFlow()
Future<AuthState>
Initiates authentication and returns the current state using Auth helper class.
// Must import extensions
import 'package:para/src/auth_extensions.dart';

final authState = await para.initiateAuthFlow(
  auth: Auth.email('user@example.com')
);
​
presentPasswordUrl()
Future<Uri?>
Presents a password authentication URL in a secure web view.

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Types and Enums

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Environment

enum Environment {
  dev,      // Development environment
  beta,     // Beta environment
  prod      // Production environment
}

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Auth

class Auth {
  static AuthEmail email(String email);
  static AuthPhone phone(String phoneNumber);
}

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AuthState

class AuthState {
  final AuthStage stage;           // Current authentication stage
  final String? userId;            // User's unique identifier
  final AuthIdentity auth;         // Authentication identity details
  final String? displayName;       // User's display name
  final String? pfpUrl;           // Profile picture URL
  final String? username;         // Username
  final Map<String, dynamic>? externalWallet; // External wallet info
  final String? passkeyUrl;       // URL for passkey authentication
  final String? passkeyId;        // Passkey identifier
  final String? passwordUrl;      // URL for password authentication
  // Additional properties for specific auth flows
}

class AuthIdentity {
  final String? email;
  final String? phoneNumber;
  final String? fid;              // Farcaster ID
  final String? telegramUserId;
  // Other identity types
}

enum AuthStage {
  verify,  // Need to verify email/phone
  login,   // Existing user, proceed to login
  signup   // New user, proceed to signup
}

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SignupMethod

enum SignupMethod {
  passkey,  // Hardware-backed passkey
  password  // Password-based authentication
}

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OAuthMethod

enum OAuthMethod {
  google,
  twitter,
  apple,
  discord,
  facebook
}

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WalletType

enum WalletType {
  evm,     // Ethereum and EVM-compatible chains
  solana,  // Solana blockchain
  cosmos   // Cosmos-based chains
}

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ParaFuture

class ParaFuture<T> {
  final Future<T> future;    // The actual future
  final String requestId;    // ID for cancellation
}

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Wallet

class Wallet {
  final String id;
  final String address;
  final WalletType type;
  final WalletScheme scheme;
  final String? userId;         // Associated user ID
  final DateTime? createdAt;    // Creation timestamp
  final String? publicKey;      // Wallet public key
  final bool? isPregen;         // Whether this is a pregenerated wallet
  // Additional optional fields available
}

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SignatureResult

// Abstract base class
abstract class SignatureResult {}

// Successful signature
class SuccessfulSignatureResult extends SignatureResult {
  final String signedTransaction;  // For transactions: complete signed transaction ready for broadcasting
                                   // For messages: just the signature
  
  SuccessfulSignatureResult(this.signedTransaction);
  
  /// Gets the transaction data ready for broadcasting.
  String get transactionData => signedTransaction;
}

// Denied signature
class DeniedSignatureResult extends SignatureResult {
  final String? pendingTransactionId;
  DeniedSignatureResult(this.pendingTransactionId);
}

// Denied with URL
class DeniedSignatureResultWithUrl extends SignatureResult {
  final String? pendingTransactionId;
  final String url;
  DeniedSignatureResultWithUrl({this.pendingTransactionId, required this.url});
}