diff --git a/ethers-core/src/types/chain.rs b/ethers-core/src/types/chain.rs
index acb8720e..41a1b777 100644
--- a/ethers-core/src/types/chain.rs
+++ b/ethers-core/src/types/chain.rs
@@ -1,11 +1,12 @@
-use serde::Deserialize;
-use thiserror::Error;
-
-use core::convert::TryFrom;
-use std::{convert::TryInto, default, fmt, str::FromStr};
-
 use crate::types::U256;
+use serde::Deserialize;
+use std::{
+    convert::{TryFrom, TryInto},
+    fmt,
+    str::FromStr,
+};
 use strum::EnumVariantNames;
+use thiserror::Error;
 
 #[derive(Debug, Clone, Error)]
 #[error("Failed to parse chain: {0}")]
@@ -26,6 +27,7 @@ pub enum Chain {
     Polygon = 137,
     Fantom = 250,
     Dev = 1337,
+    AnvilHardhat = 31337,
     FantomTestnet = 4002,
     PolygonMumbai = 80001,
     Avalanche = 43114,
@@ -86,6 +88,7 @@ impl fmt::Display for Chain {
             Chain::Oasis => "oasis",
             Chain::Emerald => "emerald",
             Chain::EmeraldTestnet => "emerald-testnet",
+            Chain::AnvilHardhat => "anvil-hardhat",
         };
 
         write!(formatter, "{}", chain)
@@ -123,6 +126,7 @@ impl TryFrom<u64> for Chain {
             100 => Chain::XDai,
             137 => Chain::Polygon,
             1337 => Chain::Dev,
+            31337 => Chain::Dev,
             250 => Chain::Fantom,
             4002 => Chain::FantomTestnet,
             80001 => Chain::PolygonMumbai,
@@ -185,6 +189,7 @@ impl FromStr for Chain {
             "fantom" => Chain::Fantom,
             "fantom-testnet" => Chain::FantomTestnet,
             "dev" => Chain::Dev,
+            "anvil" | "hardhat" | "anvil-hardhat" => Chain::AnvilHardhat,
             "bsc" => Chain::BinanceSmartChain,
             "bsc-testnet" => Chain::BinanceSmartChainTestnet,
             "arbitrum" => Chain::Arbitrum,
@@ -225,7 +230,7 @@ impl Chain {
     }
 }
 
-impl default::Default for Chain {
+impl Default for Chain {
     fn default() -> Self {
         Chain::Mainnet
     }
diff --git a/ethers-etherscan/src/lib.rs b/ethers-etherscan/src/lib.rs
index 4f1af333..cc800719 100644
--- a/ethers-etherscan/src/lib.rs
+++ b/ethers-etherscan/src/lib.rs
@@ -1,23 +1,20 @@
 //! Bindings for [etherscan.io web api](https://docs.etherscan.io/)
 
+use contract::ContractMetadata;
+use errors::EtherscanError;
+use ethers_core::{
+    abi::{Abi, Address},
+    types::{Chain, H256},
+};
+use reqwest::{header, IntoUrl, Url};
+use serde::{de::DeserializeOwned, Deserialize, Serialize};
 use std::{
     borrow::Cow,
     io::Write,
     path::PathBuf,
     time::{Duration, SystemTime, UNIX_EPOCH},
 };
-
-use contract::ContractMetadata;
-use reqwest::{header, IntoUrl, Url};
-use serde::{de::DeserializeOwned, Deserialize, Serialize};
 use tracing::trace;
-
-use errors::EtherscanError;
-use ethers_core::{
-    abi::{Abi, Address},
-    types::{Chain, H256},
-};
-
 pub mod account;
 pub mod contract;
 pub mod errors;
@@ -108,7 +105,9 @@ impl Client {
             Chain::Moonbeam | Chain::MoonbeamDev | Chain::Moonriver => {
                 std::env::var("MOONSCAN_API_KEY")?
             }
-            Chain::Dev => return Err(EtherscanError::LocalNetworksNotSupported),
+            Chain::AnvilHardhat | Chain::Dev => {
+                return Err(EtherscanError::LocalNetworksNotSupported)
+            }
         };
         Self::new(chain, api_key)
     }
@@ -297,7 +296,9 @@ impl ClientBuilder {
                 "https://testnet.explorer.emerald.oasis.dev/api",
                 "https://testnet.explorer.emerald.oasis.dev/",
             ),
-            Chain::Dev => return Err(EtherscanError::LocalNetworksNotSupported),
+            Chain::AnvilHardhat | Chain::Dev => {
+                return Err(EtherscanError::LocalNetworksNotSupported)
+            }
             chain => return Err(EtherscanError::ChainNotSupported(chain)),
         };
         self.with_api_url(etherscan_api_url?)?.with_url(etherscan_url?)