Add all RPC URL .env.example

.env.example

@@ -11,5 +11,39 @@ API_KEY=
 PORT=
 # Maximum size for incoming requests (in KB), defaults to 16
 MAX_REQUEST_SIZE=
-# RPC URL for a specific ChainId, in the format PRC_URL_<CHAIN_ID>, where <CHAIN_ID> is the desired blockchain ChainId.
+# RPC URL for a specific chainId, in the format RPC_URL_<CHAIN_ID>, where <CHAIN_ID> is the desired blockchain chainId.
+# ethereum
 RPC_URL_1=
+RPC_URL_5=
+RPC_URL_17000=
+RPC_URL_11155111=
+# polygon
+RPC_URL_137=
+RPC_URL_80001=
+RPC_URL_80002=
+# avalanche
+RPC_URL_43114=
+RPC_URL_43113=
+# fantom
+RPC_URL_250=
+RPC_URL_4002=
+# xdai
+RPC_URL_100=
+RPC_URL_10200=
+# bsc
+RPC_URL_56=
+RPC_URL_97=
+# arbitrum
+RPC_URL_42161=
+RPC_URL_421613=
+RPC_URL_421614=
+# optimism
+RPC_URL_10=
+RPC_URL_420=
+RPC_URL_11155420=
+# base
+RPC_URL_8453=
+RPC_URL_84532=
+# zksync
+RPC_URL_324=
+RPC_URL_300=