polygon

 const getProviderOrSigner = async (needSigner = false) => {
    // Connect to Metamask
    // Since we store `web3Modal` as a reference, we need to access the `current` value to get access to the underlying object

    web3Modal = new Web3Modal({
      network: "polygon", // optional
      cacheProvider: true, // optional
      providerOptions, // required
    });

    provider = await web3Modal.connect();
    const web3Provider = new providers.Web3Provider(provider);

    // If user is not connected to the Mainnet network, let them know and throw an error
    const { chainId } = await web3Provider.getNetwork();
    // rinkbey - 4
    // bsc - 97
    // polygon - 80001
    if (chainId !== 80001) {
      window.alert("Change the network to Polygon Mumbai Testnet");
      throw new Error("Change network to Polygon Mumbai Testnet");
    }

    if (needSigner) {
      const signer = web3Provider.getSigner();
      return signer;
    }
    return web3Provider;
  };