Where to add API key for Ankr RPC in viem

[mohsen158]

Hi, I'm using eth scaffold and getting the following error when calling eth_getCode via Ankr's BSC RPC:

useDeployedContractInfo.ts:40 InvalidInputRpcError: Missing or invalid parameters.
Double check you have provided the correct parameters.

URL: https://rpc.ankr.com/bsc
Request body: {"method":"eth_getCode","params":["0x7C9590D92D73083E478C6f2a46ce63CB4E7201D2","latest"]}

Details: Unauthorized: You must authenticate your request with an API key. Create an account on https://www.ankr.com/rpc/ and generate your personal API key for free.
Version: [email protected]

I understand that I need to provide an API key, but I’m not sure where exactly to add it in my viem setup. Could you please guide me on the correct way to configure Ankr's RPC URL with an API key?

Thanks in advance!

[technophile-04]

Hey you ovveride rpc with for bsc chain in scaffold.config.ts

scaffold-eth-2/packages/nextjs/scaffold.config.ts

Lines 30 to 33 in 19f0ea1

	rpcOverrides: {
	// Example:
	// [chains.mainnet.id]: "https://mainnet.buidlguidl.com",
	},

  rpcOverrides: {
    // Example:
    // [chains.mainnet.id]: "https://mainnet.buidlguidl.com",
    [chains.bsc.id]: `https://rpc.ankr.com/bsc/${process.env.NEXT_PUBLIC_ANKR_API_KEY}`,
  },

Make sure you add the api-key which you got from ankr in .env.local as NEXT_PUBLIC_ANKR_API_KEY and also while deploying to vercel, configuring that variable in vercel

[mohsen158]

Recently, this config was added to scaffold.config.ts. I don't have it in my version.

[mohsen158]

there is no rpcOverrides in scaffold.config.ts

export type ScaffoldConfig = {
  targetNetworks: readonly chains.Chain[];
  pollingInterval: number;
  alchemyApiKey: string;
  walletConnectProjectId: string;
  onlyLocalBurnerWallet: boolean;
};

[technophile-04]

Hey you can add those file changes to your repo, they are minimal 🙌 :

https://github.com/scaffold-eth/scaffold-eth-2/pull/1057/files