fix: use custom transport url for ethers provider

src/ethers-compat/publicClientToProvider.ts

@@ -17,5 +17,8 @@ export function publicClientToProvider<TChain extends Chain | undefined>(
     ensAddress: chain.contracts?.ensRegistry?.address,
   };
 
-  return new providers.StaticJsonRpcProvider(chain.rpcUrls.default.http[0], network);
+  const transportUrl = publicClient.transport.url as string | undefined;
+  const url = transportUrl ?? chain.rpcUrls.default.http[0];
+
+  return new providers.StaticJsonRpcProvider(url, network);
 }

src/ethers-compat/publicClientToProvider.unit.test.ts

@@ -0,0 +1,33 @@
+import { it, expect } from 'vitest';
+import { createPublicClient, http } from 'viem';
+import { arbitrumSepolia } from 'viem/chains';
+
+import { publicClientToProvider } from './publicClientToProvider';
+
+it(`successfully converts PublicClient to Provider`, () => {
+  const publicClient = createPublicClient({
+    chain: arbitrumSepolia,
+    transport: http(),
+  });
+
+  const provider = publicClientToProvider(publicClient);
+
+  expect(provider.network.chainId).toEqual(publicClient.chain.id);
+  expect(provider.network.name).toEqual(publicClient.chain.name);
+
+  expect(provider.connection.url).toEqual('https://sepolia-rollup.arbitrum.io/rpc');
+});
+
+it(`successfully converts PublicClient to Provider (custom Transport)`, () => {
+  const publicClient = createPublicClient({
+    chain: arbitrumSepolia,
+    transport: http('https://arbitrum-sepolia.gateway.tenderly.co'),
+  });
+
+  const provider = publicClientToProvider(publicClient);
+
+  expect(provider.network.chainId).toEqual(publicClient.chain.id);
+  expect(provider.network.name).toEqual(publicClient.chain.name);
+
+  expect(provider.connection.url).toEqual('https://arbitrum-sepolia.gateway.tenderly.co');
+});