Now, in the src/App.js file, import { useQuery } from ‘react-query’ and make a variable as the endpoint which saves the API endpoint of BitQuery’s GraphQL API i.e. https://graphql/bitquery.io/

app.js

import React from "react";
import { useQuery } from "react-query";

const endpoint = "https://graphql.bitquery.io/";
const QUERY = `
{
  bitcoin {
    blocks(options: {limit: 2}){
      height
      blockHash
    }
  }
}
`;