@phantom/wallet-sdk

The Phantom Wallet SDK allows you to integrate Phantom's wallet functionality directly into your web application.

Installation

# Using npm
npm install @phantom/wallet-sdk

# Using yarn
yarn add @phantom/wallet-sdk

# Using pnpm
pnpm add @phantom/wallet-sdk

Usage Modes

The SDK supports two primary integration modes:

1. Popup Mode (Default)

In this mode, the Phantom wallet appears as a floating widget on your page in one of the predefined positions (bottom-right, bottom-left, top-right, top-left). This is the simplest integration method.

import { createPhantom, Position } from "@phantom/wallet-sdk";

// Initialize the Phantom wallet as a popup
const phantom = await createPhantom({
  position: Position.bottomRight, // Choose from bottomRight, bottomLeft, topRight, topLeft
  hideLauncherBeforeOnboarded: false,
  namespace: "my-app",
});

// Show the wallet UI
phantom.show();

2. Element Mode (Custom Container)

In this mode, the Phantom wallet renders inside a specific HTML element that you provide. This gives you complete control over the wallet's positioning and layout within your application.

import { createPhantom } from "@phantom/wallet-sdk";

// Make sure the container element exists in your DOM
// <div id="wallet-container" style="width: 400px; height: 600px;"></div>

// Initialize the Phantom wallet inside your container
const phantom = await createPhantom({
  element: "wallet-container", // ID of the container element
  namespace: "my-app",
});

// The wallet will automatically show in the container
// You can still use show/hide methods
phantom.show();

Window Integration Behavior

Default Behavior (No Namespace)

When you initialize the SDK without specifying a namespace:

const phantom = await createPhantom();

The SDK behaves as follows:

1. If the Phantom browser extension is already installed, the SDK will not initialize a new embedded wallet to avoid conflicts. Your dApp will continue to use the extension.

2. If no extension is detected, the SDK will:

   • Attach the wallet instance to window.phantom
   • Expose blockchain RPC providers to their standard window objects:
     • window.solana for Solana
     • window.ethereum for Ethereum
     • And other blockchain providers

This means that existing dApps built for the Phantom extension can work with the embedded wallet without code changes - the same window objects they already use will be populated by the SDK.

Custom Namespace Behavior

When you specify a custom namespace:

const phantom = await createPhantom({ namespace: "myCustomWallet" });

The SDK will:

1. Initialize even if the Phantom extension is installed (allowing both to coexist)
2. Attach the wallet instance to window.myCustomWallet instead of window.phantom
3. Not automatically expose providers to standard window objects to avoid conflicts with the extension

In this case, you must use the returned object for all interactions:

// Connect to Solana using your namespaced instance
const publicKey = await phantom.solana.connect();

Usage with Existing dApps

For existing dApps that detect and use standard provider patterns:

1. Extension Installed: The dApp will use the extension as normal
2. No Extension, Default Namespace: The dApp will use the embedded wallet through the standard window objects
3. Custom Namespace: You'll need to modify your dApp code to use the custom instance

Configuration Options

The createPhantom function accepts the following configuration options:

export type CreatePhantomConfig = Partial<{
  zIndex: number; // Set the z-index of the wallet UI
  hideLauncherBeforeOnboarded: boolean; // Hide the launcher for new users
  colorScheme: string; // Light or dark mode
  paddingBottom: number; // Padding from bottom of screen
  paddingRight: number; // Padding from right of screen
  paddingTop: number; // Padding from top of screen
  paddingLeft: number; // Padding from left of screen
  position: Position; // Position on screen (bottomRight, bottomLeft, topRight, topLeft)
  sdkURL: string; // Custom SDK URL
  element: string; // ID of element to render wallet in (for custom positioning)
  namespace: string; // Namespace for the wallet instance
}>;

Note: When using Element Mode, the position setting is ignored since the wallet will render inside your specified container element.

Phantom Interface

The createPhantom function returns a Phantom interface with the following methods and properties:

export interface Phantom {
  // UI Controls
  show: () => void; // Show the wallet UI
  hide: () => void; // Hide the wallet UI

  // Wallet Actions
  buy: (options: { amount?: number; buy: string }) => void; // Buy tokens
  swap: (options: { buy: string; sell?: string; amount?: string }) => void; // Swap tokens
  navigate: ({ route, params }: { route: string; params?: any }) => void; // Navigate within wallet

  // Blockchain RPC Interfaces
  solana?: any; // Solana RPC interface
  ethereum?: any; // Ethereum RPC interface
  sui?: any; // Sui RPC interface
  bitcoin?: any; // Bitcoin RPC interface

  // App Interface
  app: PhantomApp; // Phantom app interface
}

Blockchain RPC Interfaces

The SDK exposes blockchain-specific RPC interfaces through the Phantom instance:

Solana

// Connect to wallet
const publicKey = await phantom.solana.connect();

// Sign a message
const message = new TextEncoder().encode("Hello, Solana!");
const signature = await phantom.solana.signMessage(message);

// Send a transaction
const transaction = new Transaction();
// ... add instructions ...
const signature = await phantom.solana.signAndSendTransaction(transaction);

For detailed examples, see Solana documentation.

Ethereum, Base & Polygon

// Connect to wallet
const accounts = await phantom.ethereum.request({
  method: "eth_requestAccounts",
});

// Sign a message
const from = accounts[0];
const message = "Hello, Ethereum!";
const signature = await phantom.ethereum.request({
  method: "personal_sign",
  params: [message, from],
});

// Send a transaction
const txHash = await phantom.ethereum.request({
  method: "eth_sendTransaction",
  params: [
    {
      from,
      to: "0x...",
      value: "0x...",
      // other tx params
    },
  ],
});

For detailed examples, see Ethereum documentation.

Sui

// Connect to wallet
const accounts = await phantom.sui.connect();

// Sign a transaction
// ... create transaction ...
const signedTx = await phantom.sui.signTransaction(tx);

For detailed examples, see Sui documentation.

Bitcoin

// Connect to wallet
const accounts = await phantom.bitcoin.connect();

// Sign a PSBT
// ... create PSBT ...
const signedPsbt = await phantom.bitcoin.signPsbt(psbt);

For detailed examples, see Bitcoin documentation.

Wallet Actions

Buy Tokens

// Buy SOL with default amount
phantom.buy({ buy: "solana:101/nativeToken:501" });

// Buy SOL with specific amount
phantom.buy({ buy: "solana:101/nativeToken:501", amount: 10 });

Swap Tokens

// Swap SOL to USDC
phantom.swap({
  sell: "solana:101/nativeToken:501",
  buy: "solana:101/address:EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
});

// Swap SOL to USDC with specific amount
phantom.swap({
  sell: "solana:101/nativeToken:501",
  buy: "solana:101/address:EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
  amount: "1000000000",
});