Standardize RPC information on mainnet

Author: ArseniiPetrovich

networks/mainnet/rpcs.md

@@ -4,9 +4,11 @@ description: Public RPC endpoints are available for the Filecoin mainnet.
 
 # RPCs
 
+{% hint style="info" %}
 [Chainlist](https://chainlist.org/?search=filecoin&testnets=true) provides a dynamically updated list of [available Filecoin - Mainnet RPCs](https://chainlist.org/?search=filecoin&testnets=false).
+{% endhint %}
 
-These endpoints are limited to the read-only [Filecoin JSON RPC API](../../reference/json-rpc/) including read-only [Filecoin Eth RPC](../../reference/json-rpc/eth.md) methods, except for the write operations [`MPoolPush`](../../reference/json-rpc/mpool.md#mpoolpush) and [`EthSendRawTransaction`](../../reference/json-rpc/eth.md#ethsendrawtransaction) for sending already signed messages.
+Most of these endpoints are limited to the read-only [Filecoin JSON RPC API](../../reference/json-rpc/) including read-only [Filecoin Eth RPC](../../reference/json-rpc/eth.md) methods and write operation [`MPoolPush`](../../reference/json-rpc/mpool.md#mpoolpush) (or [`EthSendRawTransaction`](../../reference/json-rpc/eth.md#ethsendrawtransaction)) for sending already signed messages.
 
 {% hint style="info" %} Please note that most publicly hosted endpoints <strong>only guarantee recent state, i.e. 2000 of the latest blocks (last 16.67 hours).</strong> To request an archival node you can contact a provider below. {% endhint %}