Use default providers with ethers.getDefaultProvider()
mainEthers provides built-in support for several third-party services (such as Ankr, QuickNode, Etherscan, INFURA, and Alchemy) via ethers.getDefaultProvider(). This allows you to start developing immediately without providing your own API keys.
Note: The default keys provided by ethers are shared and intentionally throttled. For production use, higher capacity, faster responses, and archival data, you should sign up for your own API keys from these services.