# Launch Wallet Services

> Web3Auth iOS SDK - launchWalletServices | Embedded Wallets

The `launchWalletServices` method launches a WebView which allows you to use the prebuilt wallet UI services. The method takes `ChainConfig` as the required input. Wallet Services is currently only available for EVM chains.

:::note

Access to Wallet Services is gated. You can use this feature in `sapphire_devnet` at no cost. The minimum [pricing plan](https://web3auth.io/pricing.html) to use this feature in a production environment is the **Scale Plan**.

:::

## Parameters

<Tabs
  defaultValue="table"
  values={[
    { label: "Table", value: "table" },
    { label: "Class", value: "class" },
  ]}
>

<TabItem value="table">

| Parameter           | Description                                                                                                                 |
| ------------------- | --------------------------------------------------------------------------------------------------------------------------- |
| `chainNamespace`    | Custom configuration for your preferred blockchain. As of now only EVM supported. Default value is `ChainNamespace.eip155`. |
| `decimals?`         | Number of decimals for the currency ticker. Default value is 18, and accepts `Int` as value.                                |
| `blockExplorerUrl?` | Blockchain's explorer URL. (for example, `https://etherscan.io`)                                                            |
| `chainId`           | The chain ID of the selected blockchain `String`.                                                                           |
| `displayName?`      | Display Name for the chain.                                                                                                 |
| `logo?`             | Logo for the selected `chainNamespace` and `chainId`.                                                                       |
| `rpcTarget`         | RPC Target URL for the selected `chainNamespace` and `chainId`.                                                             |
| `ticker?`           | Default currency ticker of the network (for example, `ETH`).                                                                |
| `tickerName?`       | Name for currency ticker (for example, `Ethereum`).                                                                         |

</TabItem>

<TabItem value="class">

```swift
public struct ChainConfig: Codable {
    public init(chainNamespace: ChainNamespace = ChainNamespace.eip155, decimals: Int? = 18, blockExplorerUrl: String? = nil, chainId: String, displayName: String? = nil, logo: String? = nil, rpcTarget: String, ticker: String? = nil, tickerName: String? = nil) {
        self.chainNamespace = chainNamespace
        self.decimals = decimals
        self.blockExplorerUrl = blockExplorerUrl
        self.chainId = chainId
        self.displayName = displayName
        self.logo = logo
        self.rpcTarget = rpcTarget
        self.ticker = ticker
        self.tickerName = tickerName
    }
}

```

</TabItem>
</Tabs>

## Usage

```swift
do {
	// focus-start
  try await web3Auth!.launchWalletServices(
    chainConfig: ChainConfig(
      chainId: "0xaa36a7",
      rpcTarget: "https://eth-sepolia.public.blastapi.io"
    )
   )
	// focus-end
} catch {
  print(error.localizedDescription)
  // Handle error
}
```