# SDK

The GMLayer SDK will provide specialized utilities in the future to meet the needs of advanced users for customized functionality, so stay tuned!

### Type[​](https://docs.immutable.com/docs/zkEVM/products/checkout/sdk#guides) <a href="#guides" id="guides"></a>

| Guidebook                | Note                                                                                                                                          |
| ------------------------ | --------------------------------------------------------------------------------------------------------------------------------------------- |
| Connect Wallet           | We will use the Checkout SDK to create a Web3 provider for any supported wallet and make sure it is connected to the zkEVM network.           |
| Exchange Chain           | We will use the Checkout SDK to ask the user to add the zkEVM network to the wallet and switch to this new Chain.                             |
| Wallet Balance           | We will use Checkout SDK to get the balance of tokens (ERC20) in the wallet. The list will contain tokens such as IMX, USDC, etc.             |
| Gas fee Amount estimated | We will use the Checkout SDK to obtain an estimate of the Gas fee required to perform a key Checkout operation on zkEVM and L1 (e.g., Ether). |
| Smart Checkout           | A guide to purchasing items through the Checkout SDK using an intelligent Checkout process.                                                   |