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

# ChainRPCConfig

> **ChainRPCConfig**: `Record`\<[`VCChain`](./VCChain), `string`>

ChainRPCConfig is a mapping of blockchain chains to their respective RPC endpoints.

## Example

```ts theme={null}
const config: ChainRPCConfig = {
    polygon: "https://polygon.llamarpc.com/",
};
```

## Defined in

[verifiableCredentialsSDK/types/chain.ts:17](https://github.com/Crossmint/crossmint-sdk/blob/main/packages/client/verifiable-credentials/src/verifiableCredentialsSDK/types/chain.ts#L17)