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Forking Mainnet With Anvil for Testing

If you want to test out mainnet functionality without having to actually use mainnet, you can use Anvil's forking feature and then import the local Anvil network and its generated accounts into MetaMask.

  1. Get your local dev build running and have MetaMask open in your browser.
  2. Run yarn anvil --fork-url https://mainnet.infura.io/v3/INFURA_PROJECT_ID --chain-id 1 with INFURA_PROJECT_ID replaced by your own Infura project id. (If you have not yet installed Foundry's anvil binary, run yarn foundryup first.)
  3. Anvil will output a list of account addresses, private keys and a "Mnemonic" (aka SRP, aka Secret Recovery Phrase).
  4. Import either the private keys or the SRP into MetaMask.
  5. Add the Anvil network as a custom network in MetaMask. The "New RPC URL" will need to be http://127.0.0.1:8545, set the Chain Id as 1, and the currency symbol to ETH.

You should now be able to use MetaMask, and many dapps, as if you were using mainnet. Each generated account starts with a large pre-funded ETH balance you can spend on the local fork. Note that after significant time elapses since when you forked mainnet (i.e. ran step 2 above), interactions with many dapps and smart contracts may begin to have inconsistent behavior or failures.