Layerswap Docs

Overview

For complete control over wallet connection flows, you can implement a custom WalletProvider that bridges any wallet management solution with Layerswap. This deep integration approach enables you to:

Use your own custom wallet connection UI
Integrate 3rd party wallet libraries (Dynamic, Reown, RainbowKit, etc.)
Control the entire wallet lifecycle (connect, disconnect, state management)
Customize wallet behavior to match your application’s UX

Creating a Custom Provider

To create a custom provider, use the provider creator function with the customHook parameter:

import { createStarknetProvider } from "@layerswap/wallets"
import type { WalletConnectionProvider, WalletConnectionProviderProps } from "@layerswap/widget/types"
import useCustomWalletConnection from "./hooks/useCustomWalletConnection"

// Your custom hook implementing WalletConnectionProvider
function useCustomWalletConnection(props: WalletConnectionProviderProps): WalletConnectionProvider {
  // Your custom wallet connection logic
  return {
    connectWallet: async () => { /* ... */ },
    disconnectWallets: async () => { /* ... */ },
    connectedWallets: [],
    activeWallet: undefined,
    withdrawalSupportedNetworks: ['STARKNET_MAINNET'],
    name: 'Custom Starknet',
    id: 'starknet',
    ready: true
  }
}

// Create provider with custom hook
const customProvider = createStarknetProvider({
  customHook: useCustomWalletConnection
})

WalletConnectionProvider Interface

Your custom hook must implement this interface:

type WalletConnectionProvider = (props: WalletConnectionProviderProps) => {
  connectWallet: () => Promise<Wallet | undefined>
  disconnectWallets?: () => Promise<void>
  activeWallet: Wallet | undefined
  connectedWallets: Wallet[]
  asSourceSupportedNetworks: string[]
  autofillSupportedNetworks: string[]
  withdrawalSupportedNetworks: string[]
  name: string
  id: string
  providerIcon?: string
  ready: boolean
  multiStepHandlers?: MultiStepHandler[]
  unsupportedPlatforms?: string[]
  hideFromList?: boolean
}

Props Passed to Your Hook

type WalletConnectionProviderProps = {
  networks: NetworkWithTokens[]  // Layerswap's available networks
}

Return Values

Property	Type	Required	Description
`connectWallet`	`() => Promise<Wallet \| undefined>`	✅	Function called when user clicks “Connect Wallet” in the widget
`disconnectWallets`	`() => Promise<void>`	❌	Optional function to disconnect all wallets
`activeWallet`	`Wallet \| undefined`	✅	The currently active/selected wallet
`connectedWallets`	`Wallet[]`	✅	Array of all connected wallets
`asSourceSupportedNetworks`	`string[]`	✅	Networks supported as swap source
`autofillSupportedNetworks`	`string[]`	✅	Networks that support address autofill
`withdrawalSupportedNetworks`	`string[]`	✅	Networks that support withdrawals
`name`	`string`	✅	Provider name (e.g., “Starknet”, “Ethereum”)
`id`	`string`	✅	Unique provider identifier
`providerIcon`	`string`	❌	Optional URL to provider icon
`ready`	`boolean`	✅	Critical: Whether the provider is initialized and ready to use
`multiStepHandlers`	`MultiStepHandler[]`	❌	Optional handlers for multi-step operations
`unsupportedPlatforms`	`string[]`	❌	Optional list of unsupported platforms
`hideFromList`	`boolean`	❌	Optional flag to hide provider from wallet list

Wallet Type

Your custom provider must transform external wallet objects to Layerswap’s Wallet format:

type Wallet = {
  id: string                           // Unique wallet identifier
  isActive: boolean                    // Whether this wallet is actively selected
  address: string                      // Primary wallet address
  addresses: string[]                  // All addresses (for multi-account wallets)
  displayName: string                  // User-facing wallet name
  providerName: string                 // Provider name (e.g., "Starknet")
  icon: (props: any) => React.JSX.Element  // **Critical**: Wallet icon component (NOT a string URL)
  disconnect: () => Promise<void>      // Disconnect callback
  asSourceSupportedNetworks: string[]  // Networks supported as source
  autofillSupportedNetworks: string[]  // Networks supported for autofill
  withdrawalSupportedNetworks: string[] // Networks supported for withdrawal
  networkIcon?: string                 // Optional network icon URL
}

Complete Example: Dynamic Labs Integration

This example demonstrates integrating Starknet wallets using Dynamic Labs SDK. The same pattern applies to any 3rd party library.

Live Demo

Explore the complete source code at layerswap/layerswapapp - nextjs-dynamic example

Installation

npm install @layerswap/widget @layerswap/wallets \
  @dynamic-labs/sdk-react-core @dynamic-labs/starknet \
  @bigmi/client @bigmi/core @bigmi/react

Step 1: Create Custom Connection Hook

Create a hook that implements the WalletConnectionProvider interface:

View complete hook implementation (hooks/useCustomStarknet.ts)

import { useCallback, useEffect, useMemo } from "react"
import {
  useUserWallets,
  useDynamicContext,
  dynamicEvents,
  Wallet as DynamicWallet,
} from "@dynamic-labs/sdk-react-core"
import {
  resolveWalletConnectorIcon,
  NetworkWithTokens,
} from "@layerswap/widget"
import {
  WalletConnectionProvider,
  Wallet,
  WalletConnectionProviderProps
} from "@layerswap/widget/types"

export default function useCustomStarknet({
  networks
}: WalletConnectionProviderProps): WalletConnectionProvider {
  const name = "Starknet"
  const id = "starknet"

  // Dynamic SDK context and hooks
  const { setShowAuthFlow, handleLogOut } = useDynamicContext()
  const userWallets = useUserWallets()

  // Define supported Starknet networks
  const starknetNetworkNames = [
    "STARKNET_MAINNET",
    "STARKNET_SEPOLIA",
  ]

  const supportedNetworks = useMemo(
    () => ({
      asSource: starknetNetworkNames,
      autofill: starknetNetworkNames,
      withdrawal: starknetNetworkNames,
    }),
    []  // Empty deps - starknetNetworkNames is constant
  )

  // Clean up event listeners on unmount
  useEffect(() => {
    return () => {
      dynamicEvents.removeAllListeners("walletAdded")
      dynamicEvents.removeAllListeners("authFlowCancelled")
    }
  }, [])

  // Connect wallet - show Dynamic auth flow and wait for connection
  const connectWallet = useCallback(async (): Promise<Wallet | undefined> => {
    // Log out existing wallets first
    if (userWallets.length) {
      await handleLogOut()
    }

    // Show Dynamic auth modal and wait for wallet connection
    const newDynWallet = await new Promise<DynamicWallet>((resolve, reject) => {
      setShowAuthFlow(true)

      const onAdded = (w: DynamicWallet) => {
        cleanup()
        resolve(w)
      }
      const onCancelled = () => {
        cleanup()
        reject(new Error("User cancelled the connection"))
      }
      const cleanup = () => {
        dynamicEvents.off("walletAdded", onAdded)
        dynamicEvents.off("authFlowCancelled", onCancelled)
      }

      dynamicEvents.on("walletAdded", onAdded)
      dynamicEvents.on("authFlowCancelled", onCancelled)
    })

    // Transform Dynamic wallet to Layerswap Wallet format
    return resolveWallet({
      connection: newDynWallet,
      networks,
      supportedNetworks,
      disconnect: handleLogOut,
      providerName: name,
    })
  }, [userWallets, handleLogOut, setShowAuthFlow, networks, supportedNetworks])

  // Disconnect all wallets
  const disconnectWallets = useCallback(async () => {
    await handleLogOut()
  }, [handleLogOut])

  // Map Dynamic SDK wallets to Layerswap Wallet shape
  const connectedWallets: Wallet[] = useMemo(
    () =>
      userWallets
        .map((dyn) => {
          if (!dyn) return
          return resolveWallet({
            connection: dyn,
            networks,
            supportedNetworks,
            disconnect: disconnectWallets,
            providerName: name,
          })
        })
        .filter(Boolean) as Wallet[],
    [userWallets, networks, supportedNetworks, disconnectWallets],
  )

  const logo = networks.find((n) =>
    n.name.toLowerCase().includes("starknet")
  )?.logo

  // Return WalletConnectionProvider interface
  return {
    connectWallet,
    disconnectWallets,
    activeWallet: connectedWallets.find((w) => w.isActive),
    connectedWallets,
    asSourceSupportedNetworks: supportedNetworks.asSource,
    autofillSupportedNetworks: supportedNetworks.autofill,
    withdrawalSupportedNetworks: supportedNetworks.withdrawal,
    name,
    id,
    providerIcon: logo,
    ready: true  // CRITICAL: Required field - indicates provider is ready
  }
}

/** Helper to transform Dynamic wallet to Layerswap Wallet format */
function resolveWallet(props: {
  connection: DynamicWallet
  networks: NetworkWithTokens[]
  supportedNetworks: {
    asSource: string[]
    autofill: string[]
    withdrawal: string[]
  }
  disconnect: () => Promise<void>
  providerName: string
}): Wallet | undefined {
  const { connection, networks, supportedNetworks, disconnect, providerName } = props

  const connectorName = connection.connector.name
  const address = connection.address
  if (!connectorName || !address) return

  const displayName = `${connectorName} – ${providerName}`
  const networkIcon = networks.find((n) =>
    n.name.toLowerCase().includes("starknet")
  )?.logo

  return {
    id: connectorName,
    isActive: true,
    address,
    addresses: [address],
    displayName,
    providerName,
    icon: resolveWalletConnectorIcon({
      iconUrl: connection.connector.metadata.icon
    }),  // Returns React component, NOT a string URL
    disconnect: () => disconnect(),
    asSourceSupportedNetworks: supportedNetworks.asSource,
    autofillSupportedNetworks: supportedNetworks.autofill,
    withdrawalSupportedNetworks: supportedNetworks.withdrawal,
    networkIcon,
  }
}

Step 2: Set Up Providers in Main Component

import { Swap, LayerswapProvider } from "@layerswap/widget"
import { StarknetWalletConnectors } from "@dynamic-labs/starknet"
import { DynamicContextProvider } from "@dynamic-labs/sdk-react-core"
import {
  createStarknetProvider,
  createSVMProvider,
  createBitcoinProvider
} from "@layerswap/wallets"
import useCustomStarknet from "./hooks/useCustomStarknet"
import "@layerswap/widget/index.css"

const App = () => {
  // Create custom Starknet provider that uses Dynamic Labs
  const starknetProvider = createStarknetProvider({
    customHook: useCustomStarknet
  })

  // Create other native providers
  const walletProviders = [
    starknetProvider,  // Custom provider
    createSVMProvider(),
    createBitcoinProvider()
  ]

  return (
    <DynamicContextProvider
      settings={{
        environmentId: process.env.NEXT_PUBLIC_DYNAMIC_ENVIRONMENT_ID,
        walletConnectors: [StarknetWalletConnectors],
      }}
    >
      <LayerswapProvider
        walletProviders={walletProviders}
      >
        <Swap />
      </LayerswapProvider>
    </DynamicContextProvider>
  )
}

export default App

Step 3: Environment Variables

Create a .env.local file:

NEXT_PUBLIC_DYNAMIC_ENVIRONMENT_ID=your_dynamic_environment_id
NEXT_PUBLIC_LAYERSWAP_API_KEY=your_layerswap_api_key
NEXT_PUBLIC_WALLETCONNECT_PROJECT_ID=your_walletconnect_project_id

Get Your API Keys:

Dynamic Labs: Sign up at Dynamic
Layerswap: Generate from the Partner Dashboard
WalletConnect: Get project ID at WalletConnect Cloud

Critical Implementation Details

Important: These details are critical for correct implementation

Icon Resolution: The icon property in the Wallet type must return a React component, NOT a URL string. Always use the utility function:
```
import { resolveWalletConnectorIcon } from "@layerswap/widget"

icon: resolveWalletConnectorIcon({ iconUrl: "https://..." })
```
Ready State: Always return ready: true in your WalletConnectionProvider when your provider is initialized and ready to handle connections. This is a required field - the widget will not function without it.
WalletConnect Configs: Only needed for native EVM/SVM/Starknet providers when NOT using a custom hook. If you provide customHook, the WalletConnect configuration is ignored since you control the connection flow.

Type Imports: Import types from @layerswap/widget/types:

import {
  WalletConnectionProvider,
  Wallet,
  WalletConnectionProviderProps
} from "@layerswap/widget/types"

Disconnect Callback: The disconnectWallets function in WalletConnectionProvider is optional but recommended for proper cleanup. Each individual Wallet must have its own disconnect callback.

Implementation Steps

1. Create Custom Hook

Implement WalletConnectionProvider that:

Connects to your wallet management solution (Dynamic, Reown, RainbowKit, Privy, etc.)
Transforms external wallet format to Layerswap Wallet type
Handles connect/disconnect lifecycle and error states
Manages wallet state and active wallet selection
Listens to wallet events (connection, disconnection, account changes)

2. Define Supported Networks

Specify which networks your provider supports:

const supportedNetworks = {
  asSource: ["STARKNET_MAINNET", "STARKNET_SEPOLIA"],
  autofill: ["STARKNET_MAINNET", "STARKNET_SEPOLIA"],
  withdrawal: ["STARKNET_MAINNET", "STARKNET_SEPOLIA"]
}

asSource - Networks that can be used as swap source
autofill - Networks that support address autofill
withdrawal - Networks that support withdrawals

3. Implement Connect Flow

The connectWallet function is called when users click “Connect Wallet” in the widget:

const connectWallet = async (): Promise<Wallet | undefined> => {
  // 1. Show your custom connection UI
  showYourWalletModal()

  // 2. Wait for wallet connection
  const externalWallet = await waitForConnection()

  // 3. Transform to Layerswap format
  return transformToLayerswapWallet(externalWallet)
}

4. Handle Wallet State

Keep track of connected wallets and active wallet:

const connectedWallets: Wallet[] = useMemo(
  () => externalWallets.map(transformToLayerswapWallet),
  [externalWallets]
)

const activeWallet = connectedWallets.find((w) => w.isActive)

5. Create Provider with Custom Hook

Use the factory function with your custom hook:

import { createStarknetProvider } from "@layerswap/wallets"

// ✅ Correct - Use factory function with customHook
const customProvider = createStarknetProvider({
  customHook: useYourCustomHook
})

Deprecated Pattern: Do NOT use the old spreading pattern:

// ❌ Deprecated - Do not use
const customProvider = {
  ...StarknetProvider,
  walletConnectionProvider: useYourCustomHook
}

Always use the factory function (createStarknetProvider, createEVMProvider, etc.) with the customHook parameter.

User Experience Flow

Connection Flow

User opens Layerswap widget
User clicks “Connect Wallet” button
Your custom connectWallet function is called
Your custom UI/modal appears (Dynamic, Reown, RainbowKit, etc.)
User selects wallet and approves connection
Your hook transforms the wallet to Layerswap format
Widget displays connected wallet and enables swap functionality

Disconnection Flow

User clicks disconnect in widget
Your wallet’s disconnect callback is called
Your wallet management library handles cleanup
Widget updates to show “Connect Wallet” button

Additional Examples

For more custom integration examples:

Getting Started

Widget Setup

IFrame Setup

Hosted Page Setup

Custom Wallet Management

Overview

Creating a Custom Provider

WalletConnectionProvider Interface

Props Passed to Your Hook

Return Values

Wallet Type

Complete Example: Dynamic Labs Integration

Live Demo

Installation

Step 1: Create Custom Connection Hook

Step 2: Set Up Providers in Main Component

Step 3: Environment Variables

Critical Implementation Details

Implementation Steps

1. Create Custom Hook

2. Define Supported Networks

3. Implement Connect Flow

4. Handle Wallet State

5. Create Provider with Custom Hook

User Experience Flow

Connection Flow

Disconnection Flow

Additional Examples

Getting Started

Widget Setup

IFrame Setup

Hosted Page Setup

​Overview

​Creating a Custom Provider

​WalletConnectionProvider Interface

​Props Passed to Your Hook

​Return Values

​Wallet Type

​Complete Example: Dynamic Labs Integration

​Live Demo

​Installation

​Step 1: Create Custom Connection Hook

​Step 2: Set Up Providers in Main Component

​Step 3: Environment Variables

​Critical Implementation Details

​Implementation Steps

​1. Create Custom Hook

​2. Define Supported Networks

​3. Implement Connect Flow

​4. Handle Wallet State

​5. Create Provider with Custom Hook

​User Experience Flow

​Connection Flow

​Disconnection Flow

​Additional Examples

Overview

Creating a Custom Provider

WalletConnectionProvider Interface

Props Passed to Your Hook

Return Values

Wallet Type

Complete Example: Dynamic Labs Integration

Live Demo

Installation

Step 1: Create Custom Connection Hook

Step 2: Set Up Providers in Main Component

Step 3: Environment Variables

Critical Implementation Details

Implementation Steps

1. Create Custom Hook

2. Define Supported Networks

3. Implement Connect Flow

4. Handle Wallet State

5. Create Provider with Custom Hook

User Experience Flow

Connection Flow

Disconnection Flow

Additional Examples