{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "wallet_addEthereumChain",
  "params": [{
    "chainId": "0x2105",
    "chainName": "Base Mainnet",
    "nativeCurrency": {
      "name": "Ether",
      "symbol": "ETH",
      "decimals": 18
    },
    "rpcUrls": ["https://mainnet.base.org"],
    "blockExplorerUrls": ["https://basescan.org"]
  }]
}

{
  "id": 1,
  "jsonrpc": "2.0",
  "result": null
}