{
  "request": "{account(blockNumber:\"0x21\", address: \"0x6295ee1b4f6dd65047762f924ecd367c17eabf8f\") { balance } }",
  "response": {
    "data" : null,
    "errors" : [ {
      "message" : "Exception while fetching data (/account) : Invalid params",
      "locations" : [ {
        "line" : 1,
        "column" : 2
      } ],
      "path" : [ "account" ],
      "extensions" : {
        "errorCode" : -32602,
        "errorMessage" : "Invalid params"
      }
    } ]
  },
  "statusCode": 400
}

