# Register Wallets

This guide explains how to register wallet modules with your WDK instance. The WDK Core module itself doesn't contain blockchain-specific logic; instead, you register separate modules for each chain you want to support (e.g., Ethereum, TON, Bitcoin).

## How it works

The WDK uses a builder pattern, allowing you to chain `.registerWallet()` calls. Each call connects a blockchain-specific manager to your central WDK instance.

### Parameters

The `registerWallet` method (see [API Reference](https://docs.wdk.tether.io/sdk/api-reference#registerwalletblockchain-wallet-config)) requires three arguments:

1. **Symbol**: A unique string identifier for the chain (e.g., `'ethereum'`, `'ton'`). You will use this ID later to retrieve accounts.
2. **Manager Class**: The wallet manager class imported from the specific module (e.g., `WalletManagerEvm`).
3. **Configuration**: An object containing the chain-specific settings (e.g., RPC providers, API keys).

## Installation

Install the [wallet managers](https://docs.wdk.tether.io/sdk/wallet-modules) for the blockchains you want to support:

```bash
npm install @tetherto/wdk-wallet-evm @tetherto/wdk-wallet-tron @tetherto/wdk-wallet-btc
```

## Example: Registering Multiple Wallets

### Import the Wallet Manager Packages

First, import the necessary wallet manager packages:

{% code title="Import Modules" lineNumbers="true" %}

```typescript
import WalletManagerEvm from '@tetherto/wdk-wallet-evm'
import WalletManagerTron from '@tetherto/wdk-wallet-tron'
import WalletManagerBtc from '@tetherto/wdk-wallet-btc'
```

{% endcode %}

### Register the Wallets

Then, [instantiate WDK](https://docs.wdk.tether.io/sdk/core-module/getting-started#initialize-wdk) and chain the registration calls:

{% code title="Register Wallets" lineNumbers="true" %}

```typescript
const wdk = new WDK(seedPhrase)
  // 1. Register Ethereum
  .registerWallet('ethereum', WalletManagerEvm, {
    provider: 'https://eth.drpc.org'
  })
  // 2. Register TRON
  .registerWallet('tron', WalletManagerTron, {
    provider: 'https://api.trongrid.io'
  })
  // 3. Register Bitcoin
  .registerWallet('bitcoin', WalletManagerBtc, {
    provider: 'https://blockstream.info/api'
  })
```

{% endcode %}

{% hint style="info" %}
**RPC Providers:** The examples use public RPC endpoints for demonstration. We do not endorse any specific provider.

* **Testnets:** You can find public RPCs for Ethereum and other EVM chains on [Chainlist](https://chainlist.org).
* **Mainnet:** For production environments, we recommend using reliable, paid RPC providers to ensure stability.
  {% endhint %}

{% hint style="info" %}
**TRON Networks:** Choose the correct provider for your environment.

* **Mainnet:** `https://api.trongrid.io`
* **Shasta (Testnet):** `https://api.shasta.trongrid.io`
  {% endhint %}

## Next Steps

Once your wallets are registered, you can [manage accounts and specific addresses](https://docs.wdk.tether.io/sdk/core-module/usage/account-management).