def METHOD_NAME(self) -> BaseChain:
    l1_w3 = make_web3(self._config.base_chain_rpc_url, self._config.account)
    l1_w3.middleware_onion.add(latest_block_based_cache_middleware)
    return BaseChain(w3=l1_w3, id=ChainId(l1_w3.eth.chain_id))