Add references to supported Gas API networks (#2201)

* Add references to supported Gas API networks

* fix ilnk

Author: alexandratran

services/get-started/endpoints.md

@@ -195,7 +195,7 @@ ZKsync Era WebSockets are supported on Mainnet only.
 
 ## Gas API
 
-The Gas REST API supports multiple networks.
+The [Gas REST API](../reference/gas-api/index.md) supports multiple networks.
 
 Specify the chain ID in your request to interact with the relevant network.
 

services/reference/gas-api/api-reference/basefeehistory.md

@@ -21,7 +21,8 @@ data for a specific blockchain network.
 
 **Path**:
 
-- `chainId`: `string` - ID of the chain to query
+- `chainId`: `string` - ID of the chain to query.
+  See the [list of supported chain IDs](../../../get-started/endpoints.md#gas-api).
 
 ## Returns
 

services/reference/gas-api/api-reference/basefeepercentile.md

@@ -23,6 +23,7 @@ based on historical data.
 **Path**:
 
 - `chainId`: `string` - ID of the chain to query.
+  See the [list of supported chain IDs](../../../get-started/endpoints.md#gas-api).
 
 ## Returns
 

services/reference/gas-api/api-reference/busythreshold.md

@@ -22,6 +22,7 @@ likely due to a high volume of transactions.
 **Path**:
 
 - `chainId`: `string` - ID of the chain to query.
+  See the [list of supported chain IDs](../../../get-started/endpoints.md#gas-api).
 
 ## Returns
 

services/reference/gas-api/api-reference/gasprices-type2.md

@@ -18,6 +18,7 @@ blockchain network. <CreditCost network="gasApi" method="suggestedGasFees" />
 **Path**:
 
 - `chainId`: `string` - ID of the chain to query.
+  See the [list of supported chain IDs](../../../get-started/endpoints.md#gas-api).
 
 ## Returns
 

services/reference/gas-api/api-reference/index.md

@@ -8,14 +8,18 @@ import TabItem from "@theme/TabItem";
 
 # Gas API reference
 
-This section provides reference information for the various Gas REST APIs.
+This section provides reference information for the Gas REST APIs.
 Use the APIs to:
 
 - [Get EIP-1559 gas prices.](./gasprices-type2.md)
 - [Get the base fee history (in Gwei).](./basefeehistory.md)
 - [Get the base fee percentile (in Gwei).](./basefeepercentile.md)
 - [Get the busy threshold for a network.](./busythreshold.md)
 
+:::info
+See the [list of supported Gas API networks](../../../get-started/endpoints.md#gas-api).
+:::
+
 ## Supported API request formats
 
 You can call the Gas APIs in two ways:

services/reference/gas-api/index.md

@@ -8,6 +8,10 @@ import CardList from '@site/src/components/CardList'
 
 The Gas API is a tool that delivers real-time [gas prices](../../concepts/gas.md) for supported networks, enabling users to identify the best times to execute transactions based on current rates and intricacies introduced by [EIP-1559](https://eips.ethereum.org/EIPS/eip-1559).
 
+:::info
+See the [list of supported Gas API networks](../../get-started/endpoints.md#gas-api).
+:::
+
 <CardList
   items={[
     {