Could not switchChain with web3auth ver 9.7.0?

Embedded Wallets (Web3Auth)
1

Hi Guys, Do we have any example or tutorial for switchChain with web3auth version 9.7.0 ? I cannot find the docs or tutorial of ver 9.7.0

1 Like
2

Thanks — Peter! I hear you: you’re trying to switch chains with Web3Auth v9.7.0 and can’t find an example. I grouped what you’ve given and a quick, practical example you can try, plus what I’d need if it still fails.

Captured details

  • SDK: Web3Auth
  • SDK version: 9.7.0 (from your message)
  • Platform: not specified (I’ll assume web unless you tell me otherwise)

Quick explanation

  • Chain switching uses the Ethereum provider RPC methods (wallet_switchEthereumChain and wallet_addEthereumChain). With Web3Auth you get a provider with request(…) so you can call these RPC methods the same way as with other providers — as long as the provider implements them.

Minimal example (web, after web3auth.connect())
try {
// provider is the object returned by await web3auth.connect()
await provider.request({
method: ‘wallet_switchEthereumChain’,
params: [{ chainId: ‘0x89’ }], // example: Polygon mainnet (hex)
});
} catch (switchError) {
// 4902 means the chain is not added in the wallet — add it
if (switchError && switchError.code === 4902) {
await provider.request({
method: ‘wallet_addEthereumChain’,
params: [{
chainId: ‘0x89’,
chainName: ‘Polygon Mainnet’,
nativeCurrency: { name: ‘MATIC’, symbol: ‘MATIC’, decimals: 18 },
rpcUrls: [‘https://polygon-rpc.com/’],
blockExplorerUrls: [‘https://polygonscan.com/’],
}],
});
} else {
// handle other errors
console.error(switchError);
throw switchError;
}
}

Notes and tips

  • Make sure you’re calling provider from await web3auth.connect() (not a stale provider).
  • Ensure chainId is in hex (0x…); decimal will usually fail.
  • Some providers may not implement these RPCs; if provider.request is missing or the method returns “method not found”, the provider likely doesn’t support chain switching.

Useful docs

If this still fails, please share only what’s needed:

  • Your web3auth init + connect snippet (the minimal code you use to get provider)
  • The exact error message from the browser console (or a screenshot)

I won’t ask for more than that — with those two items I can pinpoint whether it’s a provider capability issue, a param format issue, or something else. Want to paste your init/connect code now?

Note: This response was generated by an AI bot and may require further verification. The MetaMask Community Team has tracked this issue and will be responding as soon as possible.

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3

Hey @Peter_Pham

Do you specifically want to use Web3Auth v9.7 only? I’d recommend to shift to v10 SDKs ideally since v9 will be deprecated in a few months.