fix: return rpc url

Author: Jeday

docs/sdk/get-started/usage.md

@@ -56,6 +56,21 @@ const sdk = new LidoSDK({
 });
 ```
 
+or let the SDK create it for you by passing RPC URL(s):
+
+```ts
+import { LidoSDK } from '@lidofinance/lido-ethereum-sdk';
+// viem is still required as peer dependency for inner workings of SDK
+import { hoodi } from 'viem/chains';
+
+const sdk = new LidoSDK({
+  // in this chainId must be provided explicitly
+  chainId: hoodi.id,
+  // multiple RPC URLs are supported and used in viem's fallback transport
+  rpcUrls: ['<RPC_URL>'],
+});
+```
+
 Replace `<RPC_URL>` with the address of your Ethereum provider.
 
 ## With walletClient

packages/sdk/src/core/core.ts

@@ -125,7 +125,6 @@ export default class LidoSDKCore extends LidoSDKCacheable {
 
       publicClient: publicClientProp,
       walletClient: walletClientProp,
-      // eslint-disable-next-line deprecation/deprecation
       rpcUrls,
       // eslint-disable-next-line deprecation/deprecation
       rpcProvider,
@@ -157,8 +156,14 @@ export default class LidoSDKCore extends LidoSDKCacheable {
 
     const publicClient: LidoSdkPublicClient =
       publicClientProp ??
-      // eslint-disable-next-line deprecation/deprecation
-      LidoSDKCore.createRpcProvider(chainId, rpcUrls as string[]);
+      createPublicClient({
+        batch: {
+          multicall: true,
+        },
+        chain: VIEM_CHAINS[chainId],
+        // rpcUrls are checked above
+        transport: fallback((rpcUrls as string[]).map((url) => http(url))),
+      });
 
     if (publicClient?.chain?.id !== chainId) {
       throw this.error({

packages/sdk/src/core/types.ts

@@ -51,7 +51,6 @@ export type LidoSdkKeyedClient = {
 
 type LidoSDKCorePropsPublicClientProps =
   | {
-      /** @deprecated Use `publicClient` instead. */
       rpcUrls: string[];
       chainId: (typeof SUPPORTED_CHAINS)[number];
       publicClient?: undefined;