Highlight need for Etherscan api keys in README and config examples (#…

…241)

README.md

@@ -73,6 +73,7 @@ const config: HardhatUserConfig = {
 
 + Option setups for common and advanced use cases can be seen in the [Config Examples][2] docs.
 + Get a [free tier Coinmarketcap API key][3] if you want price data
++ (Also) get [free tier Etherscan API keys](#supported-networks) if you want price data for Ethereum mainnet or an L2 network.
 
 | Options                         |    Type    |   Default  | Description                                                                                                                                                                                                                                                         |
 | :------------------------------ | :--------: | :--------: | :------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
@@ -140,11 +141,13 @@ npx hardhat hhgas:merge "gasReporterOutput-*.json"
 
 API keys for the networks this plugin auto-configures via the `L1` and `L2` options are available from the links below. In many cases these aren't equired - you'll only need to set them if you start seeing rate-limit warnings.
 
+:warning:   **UPDATE:** Etherscan now requires api keys to fetch both L1 (Ethereum Mainnet) **and** L2 gas price data. (An example config [can be found here][2])
+
 **L2**
 
-+ [arbitrum][113] (live `baseFeePerByte` prices require an API key)
-+ [base][110] (live `blobBaseFee` prices require an API key)
-+ [optimism][109] (live `blobBaseFee` prices require an API key)
++ [arbitrum][113] (live `baseFeePerByte` prices require an L2 API key )
++ [base][110] (live `blobBaseFee` prices require an L2 API key)
++ [optimism][109] (live `blobBaseFee` prices require an L2 API key)
 
 **L1**
 

docs/advanced.md

@@ -13,6 +13,18 @@
 
 Some example gas reporter option settings for different use-cases
 
+### Ethereum Mainnet
+
+*...with live market pricing*
+```ts
+const config: HardhatUserConfig = {
+  gasReporter: {
+    L1Etherscan: "ABC...",    // Etherscan api key
+    coinmarketcap: "abc...",  // Coinmarketcap api key
+  }
+}
+```
+
 ### L1 Network
 
 *...on a non-ethereum network with very low costs*
@@ -33,7 +45,7 @@ const config: HardhatUserConfig = {
 const config: HardhatUserConfig = {
   gasReporter: {
     L2: "optimism",
-    L1Etherscan: "ABC...",
+    L1Etherscan: "ABC...",   // Requires api keys for both Ethereum Mainnet and Optimism
     L2Etherscan: "ABC...",
     currency: "EUR",
     coinmarketcap: "abc...",