Authentication Functions

sdk.auth.email

sendOTP

Send a one-time password to a user’s email address.

Future<void> sendOTP(String email)

Parameters

email (String) - User’s email address

Example

try {
  await sdk.auth.email.sendOTP('[email protected]');
  // Show OTP input UI
} catch (e) {
  print('Failed to send OTP: $e');
}

verifyOTP

Verify an email OTP code and authenticate the user.

Future<void> verifyOTP(String token)

Parameters

token (String) - OTP code entered by user

Example

try {
  await sdk.auth.email.verifyOTP('123456');
  // User is now authenticated
} catch (e) {
  print('Invalid OTP: $e');
}

resendOTP

Resend the email OTP.

Future<void> resendOTP()

Example

try {
  await sdk.auth.email.resendOTP();
} catch (e) {
  print('Failed to resend OTP: $e');
}

sdk.auth.sms

sendOTP

Send a one-time password to a user’s phone number via SMS.

Future<void> sendOTP(PhoneData phoneData)

Parameters

phoneData (PhoneData) - Phone data containing dial code, ISO code, and phone number

Example

try {
  final phoneData = PhoneData(
    dialCode: '+1',
    iso2: 'US',
    phone: '5551234567',
  );
  await sdk.auth.sms.sendOTP(phoneData);
  // Show OTP input UI
} catch (e) {
  print('Failed to send SMS: $e');
}

verifyOTP

Verify an SMS OTP code and authenticate the user.

Future<void> verifyOTP(String token)

Parameters

token (String) - OTP code entered by user

Example

try {
  await sdk.auth.sms.verifyOTP('123456');
  // User is now authenticated
} catch (e) {
  print('Invalid OTP: $e');
}

resendOTP

Resend the SMS OTP.

Future<void> resendOTP()

Example

try {
  await sdk.auth.sms.resendOTP();
} catch (e) {
  print('Failed to resend SMS: $e');
}

connect

Authenticate with a social provider (Google, Apple, Farcaster).

Future<void> connect(SocialProvider provider)

Parameters

provider (SocialProvider) - The social provider:
- SocialProvider.google
- SocialProvider.apple
- SocialProvider.farcaster

Examples

try {
  // Google
  await sdk.auth.social.connect(SocialProvider.google);
  // Apple
  await sdk.auth.social.connect(SocialProvider.apple);
  // Farcaster
  await sdk.auth.social.connect(SocialProvider.farcaster);
} catch (e) {
  print('Sign-in failed: $e');
}

sdk.auth.passkey

Authenticate with a passkey using the device’s biometric authentication.

Future<void> signIn()

Example

try {
  await sdk.auth.passkey.signIn();
  // User is authenticated
} catch (e) {
  print('Passkey sign-in failed: $e');
}

sdk.auth.externalAuth

signInWithExternalJwt

Future<void> signInWithExternalJwt({required String jwt})

Parameters

jwt (String) - The external JWT token

Example

try {
  await sdk.auth.externalAuth.signInWithExternalJwt(
    jwt: 'your-jwt-token',
  );
} catch (e) {
  print('JWT sign-in failed: $e');
}

Authentication State

authenticatedUser

Get the current authenticated user (synchronous).

UserProfile? get authenticatedUser

Example

final user = sdk.auth.authenticatedUser;
if (user != null) {
  print('User: ${user.email}');
}

authenticatedUserChanges

Observe authentication state changes (reactive stream).

Stream<UserProfile?> get authenticatedUserChanges

Example

sdk.auth.authenticatedUserChanges.listen((user) {
  // Handle user state change
  setState(() {
    isAuthenticated = user != null;
  });
});

StreamBuilder Example

StreamBuilder<UserProfile?>(
  stream: sdk.auth.authenticatedUserChanges,
  initialData: sdk.auth.authenticatedUser,
  builder: (context, snapshot) {
    final user = snapshot.data;
    if (user != null) {
      return Text('Logged in as ${user.email}');
    } else {
      return Text('Not logged in');
    }
  },
)

token

Get the current authentication token (synchronous).

String? get token

Example

final token = sdk.auth.token;
if (token != null) {
  print('Token: ${token.substring(0, 20)}...');
}

tokenChanges

Observe authentication token changes (reactive stream).

Stream<String?> get tokenChanges

Example

sdk.auth.tokenChanges.listen((token) {
  if (token != null && token.isNotEmpty) {
    // Token received, navigate to home
    Navigator.pushReplacementNamed(context, '/home');
  }
});

StreamBuilder Example

StreamBuilder<String?>(
  stream: sdk.auth.tokenChanges,
  initialData: sdk.auth.token,
  builder: (context, snapshot) {
    final hasToken = snapshot.data != null && snapshot.data!.isNotEmpty;
    return Text(hasToken ? 'Authenticated' : 'Not authenticated');
  },
)

Logout

logout

Log out the current user.

Future<void> logout()

Example

try {
  await sdk.auth.logout();
} catch (e) {
  print('Logout failed: $e');
}

Complete Authentication Flow Example

Email Authentication

class EmailAuthScreen extends StatefulWidget {
  @override
  _EmailAuthScreenState createState() => _EmailAuthScreenState();
}

class _EmailAuthScreenState extends State<EmailAuthScreen> {
  final sdk = DynamicSDK.instance;
  final emailController = TextEditingController();
  final otpController = TextEditingController();
  bool otpSent = false;
  bool isLoading = false;

  Future<void> handleSendOTP() async {
    setState(() => isLoading = true);

    try {
      await sdk.auth.email.sendOTP(emailController.text);
      setState(() {
        otpSent = true;
        isLoading = false;
      });
    } catch (e) {
      setState(() => isLoading = false);
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(content: Text('Failed to send OTP: $e')),
      );
    }
  }

  Future<void> handleVerifyOTP() async {
    setState(() => isLoading = true);

    try {
      await sdk.auth.email.verifyOTP(otpController.text);
      // User is now authenticated, navigation handled by auth state listener
    } catch (e) {
      setState(() => isLoading = false);
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(content: Text('Invalid OTP: $e')),
      );
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('Email Authentication')),
      body: Padding(
        padding: EdgeInsets.all(16.0),
        child: Column(
          children: [
            if (!otpSent) ...[
              TextField(
                controller: emailController,
                decoration: InputDecoration(
                  labelText: 'Email',
                  hintText: '[email protected]',
                ),
                keyboardType: TextInputType.emailAddress,
              ),
              SizedBox(height: 20),
              ElevatedButton(
                onPressed: isLoading ? null : handleSendOTP,
                child: isLoading
                    ? CircularProgressIndicator()
                    : Text('Send OTP'),
              ),
            ] else ...[
              TextField(
                controller: otpController,
                decoration: InputDecoration(
                  labelText: 'Enter OTP',
                  hintText: '123456',
                ),
                keyboardType: TextInputType.number,
              ),
              SizedBox(height: 20),
              ElevatedButton(
                onPressed: isLoading ? null : handleVerifyOTP,
                child: isLoading
                    ? CircularProgressIndicator()
                    : Text('Verify OTP'),
              ),
              TextButton(
                onPressed: () async {
                  try {
                    await sdk.auth.email.resendOTP();
                    ScaffoldMessenger.of(context).showSnackBar(
                      SnackBar(content: Text('OTP resent')),
                    );
                  } catch (e) {
                    ScaffoldMessenger.of(context).showSnackBar(
                      SnackBar(content: Text('Failed to resend: $e')),
                    );
                  }
                },
                child: Text('Resend OTP'),
              ),
            ],
          ],
        ),
      ),
    );
  }

  @override
  void dispose() {
    emailController.dispose();
    otpController.dispose();
    super.dispose();
  }
}

SMS Authentication

class SmsAuthScreen extends StatefulWidget {
  @override
  _SmsAuthScreenState createState() => _SmsAuthScreenState();
}

class _SmsAuthScreenState extends State<SmsAuthScreen> {
  final sdk = DynamicSDK.instance;
  final phoneController = TextEditingController();
  final otpController = TextEditingController();
  bool otpSent = false;
  bool isLoading = false;

  Future<void> handleSendOTP() async {
    setState(() => isLoading = true);

    try {
      final phoneData = PhoneData(
        dialCode: '+1',
        iso2: 'US',
        phone: phoneController.text,
      );
      await sdk.auth.sms.sendOTP(phoneData);
      setState(() {
        otpSent = true;
        isLoading = false;
      });
    } catch (e) {
      setState(() => isLoading = false);
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(content: Text('Failed to send SMS: $e')),
      );
    }
  }

  Future<void> handleVerifyOTP() async {
    setState(() => isLoading = true);

    try {
      await sdk.auth.sms.verifyOTP(otpController.text);
      // User is now authenticated
    } catch (e) {
      setState(() => isLoading = false);
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(content: Text('Invalid OTP: $e')),
      );
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('SMS Authentication')),
      body: Padding(
        padding: EdgeInsets.all(16.0),
        child: Column(
          children: [
            if (!otpSent) ...[
              TextField(
                controller: phoneController,
                decoration: InputDecoration(
                  labelText: 'Phone Number',
                  hintText: '5551234567',
                ),
                keyboardType: TextInputType.phone,
              ),
              SizedBox(height: 20),
              ElevatedButton(
                onPressed: isLoading ? null : handleSendOTP,
                child: isLoading
                    ? CircularProgressIndicator()
                    : Text('Send OTP'),
              ),
            ] else ...[
              TextField(
                controller: otpController,
                decoration: InputDecoration(
                  labelText: 'Enter OTP',
                  hintText: '123456',
                ),
                keyboardType: TextInputType.number,
              ),
              SizedBox(height: 20),
              ElevatedButton(
                onPressed: isLoading ? null : handleVerifyOTP,
                child: isLoading
                    ? CircularProgressIndicator()
                    : Text('Verify OTP'),
              ),
              TextButton(
                onPressed: () async {
                  try {
                    await sdk.auth.sms.resendOTP();
                    ScaffoldMessenger.of(context).showSnackBar(
                      SnackBar(content: Text('OTP resent')),
                    );
                  } catch (e) {
                    ScaffoldMessenger.of(context).showSnackBar(
                      SnackBar(content: Text('Failed to resend: $e')),
                    );
                  }
                },
                child: Text('Resend OTP'),
              ),
            ],
          ],
        ),
      ),
    );
  }

  @override
  void dispose() {
    phoneController.dispose();
    otpController.dispose();
    super.dispose();
  }
}

class SocialAuthButtons extends StatelessWidget {
  final sdk = DynamicSDK.instance;

  @override
  Widget build(BuildContext context) {
    return Column(
      children: [
        ElevatedButton.icon(
          onPressed: () async {
            try {
              await sdk.auth.social.connect(SocialProvider.google);
            } catch (e) {
              ScaffoldMessenger.of(context).showSnackBar(
                SnackBar(content: Text('Google sign-in failed: $e')),
              );
            }
          },
          icon: Icon(Icons.g_mobiledata),
          label: Text('Continue with Google'),
        ),
        SizedBox(height: 12),
        ElevatedButton.icon(
          onPressed: () async {
            try {
              await sdk.auth.social.connect(SocialProvider.apple);
            } catch (e) {
              ScaffoldMessenger.of(context).showSnackBar(
                SnackBar(content: Text('Apple sign-in failed: $e')),
              );
            }
          },
          icon: Icon(Icons.apple),
          label: Text('Continue with Apple'),
        ),
        SizedBox(height: 12),
        ElevatedButton.icon(
          onPressed: () async {
            try {
              await sdk.auth.social.connect(SocialProvider.farcaster);
            } catch (e) {
              ScaffoldMessenger.of(context).showSnackBar(
                SnackBar(content: Text('Farcaster sign-in failed: $e')),
              );
            }
          },
          icon: Icon(Icons.telegram),
          label: Text('Continue with Farcaster'),
        ),
      ],
    );
  }
}

Passkey Authentication

class PasskeyAuthButton extends StatelessWidget {
  final sdk = DynamicSDK.instance;

  @override
  Widget build(BuildContext context) {
    return ElevatedButton.icon(
      onPressed: () async {
        try {
          await sdk.auth.passkey.signIn();
          // User is authenticated
        } catch (e) {
          ScaffoldMessenger.of(context).showSnackBar(
            SnackBar(content: Text('Passkey sign-in failed: $e')),
          );
        }
      },
      icon: Icon(Icons.fingerprint),
      label: Text('Sign in with Passkey'),
    );
  }
}

Getting Started

Authentication

Wallets

Gasless

Flutter Specific

SDK Reference

​sdk.auth.email

​sendOTP

​Parameters

​Example

​verifyOTP

​Parameters

​Example

​resendOTP

​Example

​sdk.auth.sms

​sendOTP

​Parameters

​Example

​verifyOTP

​Parameters

​Example

​resendOTP

​Example

​sdk.auth.social

​connect

​Parameters

​Examples

​sdk.auth.passkey

​signIn

​Example

​sdk.auth.externalAuth

​signInWithExternalJwt

​Parameters

​Example

​Authentication State

​authenticatedUser

​Example

​authenticatedUserChanges

​Example

​StreamBuilder Example

​token

​Example

​tokenChanges

​Example

​StreamBuilder Example

​Logout

​logout

​Example

​Complete Authentication Flow Example

​Email Authentication

​SMS Authentication

​Social Authentication

​Passkey Authentication

sdk.auth.email

sendOTP

Parameters

Example

verifyOTP

Parameters

Example

resendOTP

Example

sdk.auth.sms

sendOTP

Parameters

Example

verifyOTP

Parameters

Example

resendOTP

Example

sdk.auth.social

connect

Parameters

Examples

sdk.auth.passkey

signIn

Example

sdk.auth.externalAuth

signInWithExternalJwt

Parameters

Example

Authentication State

authenticatedUser

Example

authenticatedUserChanges

Example

StreamBuilder Example

token

Example

tokenChanges

Example

StreamBuilder Example

Logout

logout

Example

Complete Authentication Flow Example

Email Authentication

SMS Authentication

Social Authentication

Passkey Authentication