# Chains and networks

> Configure blockchain networks in MetaMask Developer Dashboard | Embedded Wallets

The **Chains & Networks** tab lets you enable and disable blockchain networks for your project without writing any code. Changes take effect immediately for all SDK integrations that use this project.

## Supported networks

The dashboard includes pre-configured support for major networks including:

- Ethereum (Mainnet and Sepolia testnet)
- Arbitrum (One and Sepolia testnet)
- Avalanche (C-Chain and Fuji testnet)
- Base (Mainnet and Sepolia testnet)
- Polygon (Mainnet and Amoy testnet)
- Optimism (Mainnet and Sepolia testnet)
- BNB Smart Chain (Mainnet and testnet)

Toggle any network on or off from the list.

## Add a custom network {#adding-custom-networks}

To add a network that is not in the pre-configured list, click **Add a Custom Network** and fill in the following fields:

| Field              | Description                                       |
| ------------------ | ------------------------------------------------- |
| Logo URL           | An image URL for the network's logo               |
| Network name       | A display name for the network                    |
| Currency symbol    | The native token symbol (for example, ETH, MATIC) |
| Chain ID           | The unique numeric identifier for the network     |
| Block explorer URL | The base URL for the network's block explorer     |
| RPC URL            | The RPC endpoint for interacting with the network |

Click **Save Network** to apply. See [Add custom chains](/embedded-wallets/dashboard/advanced/custom-chains) for how to configure custom chains in SDK code as well.