Dev Mainnet MetaMask

Full JavaScript code​

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import detectEthereumProvider from "@metamask/detect-provider";

const configure = async () => {
  const provider = await detectEthereumProvider({ mustBeMetaMask: true });
  if (provider) {
    try {
      await provider.request({ method: "eth_requestAccounts" });
      await provider.request({
        method: "wallet_addEthereumChain",
        params: [
          {
            chainId: "0x" + (1111111).toString(16),
            chainName: "ParaTon Mainnet",
            nativeCurrency: {
              name: "PARA",
              symbol: "PARA",
              decimals: 18
            },
            rpcUrls: ["https://paraRpc.org"],
            blockExplorerUrls: ["https://paraRpcscan.org/"]
          }
        ]
      });
    } catch (e) {
      alert("Error");
      console.error("configure provider error", e);
    }
  } else {
    alert("Please install MetaMask");
  }
};

export default function App() {
  return (
    <div className="App">
      <button onClick={configure}>Connect</button>
    </div>
  );
}