> ## Documentation Index
> Fetch the complete documentation index at: https://align.tolbel.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Set Custom RPC

> Override the default RPC URL for a network

## Method Signature

```typescript theme={null}
align.blockchain.providers.setCustomRpc(
  network: Network,
  rpcUrl: string
): void
```

## Parameters

<ParamField body="network" type="string" required>
  Network to configure
</ParamField>

<ParamField body="rpcUrl" type="string" required>
  Custom RPC URL
</ParamField>

## Examples

<Tabs>
  <Tab title="TypeScript">
    ```typescript theme={null}
    import Align from "@tolbel/align";

    const align = new Align({
      apiKey: process.env.ALIGN_API_KEY!,
      environment: "sandbox",
    });

    // Use Alchemy for Ethereum
    align.blockchain.providers.setCustomRpc(
      "ethereum",
      "https://eth-mainnet.g.alchemy.com/v2/YOUR-API-KEY"
    );

    // Use Infura for Polygon
    align.blockchain.providers.setCustomRpc(
      "polygon",
      "https://polygon-mainnet.infura.io/v3/YOUR-PROJECT-ID"
    );

    // Now getProvider uses the custom URLs
    const provider = align.blockchain.providers.getProvider("ethereum");
    ```
  </Tab>

  <Tab title="JavaScript">
    ```javascript theme={null}
    align.blockchain.providers.setCustomRpc(
      "polygon",
      process.env.ALCHEMY_POLYGON_URL
    );
    ```
  </Tab>
</Tabs>

### Configure at Initialization

```typescript theme={null}
const align = new Align({
  apiKey: process.env.ALIGN_API_KEY!,
  environment: "production",
  blockchain: {
    customRpcUrls: {
      ethereum: "https://eth-mainnet.g.alchemy.com/v2/KEY",
      polygon: "https://polygon-mainnet.g.alchemy.com/v2/KEY",
    },
  },
});
```

<Tip>
  Premium RPC providers offer higher rate limits, better uptime, and additional
  features like archive data access.
</Tip>

## Related Methods

<CardGroup cols={2}>
  <Card title="Get Provider" icon="server" href="/docs/api/blockchain/providers/get-provider">
    Get provider instance
  </Card>

  <Card title="Get Network Info" icon="circle-info" href="/docs/api/blockchain/providers/get-network-info">
    Get network config
  </Card>
</CardGroup>