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The Phantom Connect Browser SDK provides sdk.connect() to establish a connection to the wallet and access chain-specific operations.
Learn about Phantom Connect: For details about authentication flows, login, account selection, and session management, see the Phantom Connect guide.

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Basic connection

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Connection flow

After instantiating the SDK, use sdk.connect() to establish a connection to the wallet: 
import { BrowserSDK, AddressType } from "@phantom/browser-sdk";

// 1. Create SDK instance with allowed providers
const sdk = new BrowserSDK({
  providers: ["google", "apple", "injected"], // Allowed auth providers
  addressTypes: [AddressType.solana, AddressType.ethereum],
  appId: "your-app-id", // Required when using embedded providers
});

// 2. Connect to wallet (provider parameter must be in allowed providers list)
const { addresses } = await sdk.connect({ provider: "google" });
console.log("Connected addresses:", addresses);

// 3. Use chain-specific methods
const signature = await sdk.solana.signMessage("Hello!");
const ethResult = await sdk.ethereum.sendTransaction({
  to: "0x...",
  value: "1000000000000000000",
  gas: "21000",
});

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Authentication providers

The connect() method requires a provider parameter and automatically switches between providers based on the authentication method you specify: 
// Connect with injected provider (Phantom extension)
// Automatically switches to injected provider if not already using it
await sdk.connect({ provider: "injected" });

// Connect with Google authentication (embedded provider)
// Automatically switches to embedded provider if not already using it
await sdk.connect({ provider: "google" });

// Connect with Apple authentication (embedded provider)
await sdk.connect({ provider: "apple" });
The "deeplink" provider opens the Phantom mobile app on mobile devices. It only appears when the Phantom extension is not installed. Include it in your providers array for mobile support.

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Connecting to injected extension

The injected provider directly connects to the user’s Phantom browser extension (not an embedded wallet). Before using this option, check if the extension is installed: 
import { BrowserSDK, AddressType } from "@phantom/browser-sdk";

const sdk = new BrowserSDK({
  providers: ["google", "apple", "injected"],
  addressTypes: [AddressType.solana, AddressType.ethereum],
  appId: "your-app-id",
});

// Check if Phantom extension is installed
const isInstalled = await sdk.isPhantomInstalled();

if (isInstalled) {
  // Connect directly to the extension wallet
  await sdk.connect({ provider: "injected" });
} else {
  // Fallback to embedded wallet with OAuth
  await sdk.connect({ provider: "google" });
}
When to use the injected provider:
  • User wants to use their existing extension wallet directly.
  • No embedded wallet creation needed.
  • Direct access to extension accounts and balances.

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Configuration options

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SDK configuration

const sdk = new BrowserSDK({
  // List of allowed authentication providers (REQUIRED)
  providers: ["google", "apple", "injected", "deeplink"],
  
  // Networks to enable
  addressTypes: [AddressType.solana, AddressType.ethereum],
  
  // Required when using embedded providers (google, apple, deeplink)
  appId: "your-app-id",
  
  // Optional configuration
  authOptions: {
    authUrl: "https://connect.phantom.app/login", // optional
    redirectUrl: "https://yourapp.com/auth/callback", // optional, defaults to current page
  },
  
  // Auto-connect to existing session (default: true when embedded providers are used)
  autoConnect: true,
});
Notes about redirectUrl (for embedded provider):
  • Must be an existing page/route in your app.
  • Must be allowlisted in your Phantom Portal app configuration.
  • This is where users will be redirected after completing OAuth authentication.

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Chain-specific operations

After connection, use dedicated chain interfaces:

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Solana operations

// Message signing
const signature = await sdk.solana.signMessage("Hello Solana!");

// Transaction signing (without sending)
const signedTx = await sdk.solana.signTransaction(transaction);

// Sign and send transaction
const result = await sdk.solana.signAndSendTransaction(transaction);

// Network switching (works on embedded for solana)
await sdk.solana.switchNetwork('devnet');

// Utilities
const publicKey = await sdk.solana.getPublicKey();
const isConnected = sdk.solana.isConnected();

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Ethereum operations

EVM support for Phantom Connect embedded wallets will go live later in 2026.
// EIP-1193 requests
const accounts = await sdk.ethereum.request({ method: 'eth_accounts' });
const chainId = await sdk.ethereum.request({ method: 'eth_chainId' });

// Message signing
const signature = await sdk.ethereum.signPersonalMessage(message, address);

// EIP-712 typed data signing
const typedDataSignature = await sdk.ethereum.signTypedData(typedData, address);

// Transaction sending
const result = await sdk.ethereum.sendTransaction({
  to: "0x...",
  value: "1000000000000000000", // 1 ETH in wei
  gas: "21000",
});

// Network switching
await sdk.ethereum.switchChain(1); // Ethereum mainnet
await sdk.ethereum.switchChain(137); // Polygon

// Utilities
const chainId = await sdk.ethereum.getChainId();
const accounts = await sdk.ethereum.getAccounts();
const isConnected = sdk.ethereum.isConnected();

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Auto-connect feature

The SDK can automatically reconnect to existing sessions when instantiated, providing a seamless user experience. 
const sdk = new BrowserSDK({
  providers: ["google", "apple"],
  addressTypes: [AddressType.solana],
  appId: "your-app-id",
  autoConnect: true, // Default: true when embedded providers are used, false for injected-only
});

// SDK will automatically check for existing valid session and connect in background
// No need to call connect() if user already has a session

// Check if already connected
if (sdk.isConnected()) {
  console.log("Already connected!");
  const addresses = await sdk.getAddresses();
} else {
  // First time or session expired, need to connect manually
  await sdk.connect({ provider: "google" });
}

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Disabling auto-connect

const sdk = new BrowserSDK({
  providers: ["google", "apple"],
  appId: "your-app-id",
  addressTypes: [AddressType.solana],
  autoConnect: false, // Disable auto-connect
});

// Now you must manually call connect() every time
await sdk.connect({ provider: "google" });

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Auto-connect events

You can listen for connection events to update your UI accordingly: 
// Set up event listeners BEFORE autoConnect
sdk.on("connect", (data) => {
  console.log("Connected successfully!");
  console.log("Source:", data.source); // "auto-connect" | "manual-connect"
  console.log("Provider type:", data.provider);
  console.log("Addresses:", data.addresses);
  // Update your UI state here
});

sdk.on("connect_error", (data) => {
  console.log("Connection failed:", data.error);
  console.log("Source:", data.source); // "auto-connect" | "manual-connect"
  // Show connect button to user
});

// Auto-connect will trigger events
await sdk.autoConnect();

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Handling connection errors

When a connection fails, the connect() promise rejects with an error. 
try {
  const { addresses } = await sdk.connect({ provider: "google" });
  // Connection successful
  console.log("Connected addresses:", addresses);
} catch (error) {
  // Connection failed (user cancelled, network error, etc)
  console.error("Connection failed:", error);
}