Merge pull request #134 from rsksmart/update_devportal_for_release

Updating DevPortal for upcoming release ARROWHEAD-6.4

docs/03-node-operators/04-setup/03-configuration/03-reference.md

@@ -37,6 +37,7 @@ The following detail the most commonly used configuration fields parsed by RSKj.
 - [`wallet`](#wallet)
 - [`scoring`](#scoring)
 - [`miner`](#miner)
+- [`miner.stableGasPrice`](#minerstablegasprice)
 - [`blockchain.config.name`](#blockchainconfigname)
 - [`bind_address`](#bind_address)
 - [`public.ip`](#publicip)
@@ -347,9 +348,60 @@ scoring {
 Check out [Configure RSKj node for mining](/node-operators/merged-mining/configure-mining)
 for detailed information about the `miner` configuration.
 
+## miner.stableGasPrice
+
+The `stableGasPrice` feature allows miners to set a predictable gas price for transactions, establishing a minimum rate that is less affected by market volatility and better aligned with fiat currency values like USD or EUR. This enhances cost management and improves overall transaction efficiency.
+
+The source configuration supports two methods: `ETH_CALL` and `HTTP_GET`.
+
+- **ETH_CALL**: This method retrieves the gas price directly from a specified smart contract, allowing for real-time adjustments based on the contract's logic.
+- **HTTP_GET**: This method fetches gas price data from an external API, providing flexibility to pull market data from trusted sources.
+
+**Example of ETH_CALL**
+```plaintext
+stableGasPrice {
+    enabled = true
+
+    source {
+        method = "ETH_CALL"
+        params {
+            from = "0x0000000000000000000000000000000000000000"
+            to = "0xCA41630b09048b6f576459C34341cAB8Dc2cBE7E"
+            data = "0xdf16e52d"
+        }
+    }
+
+    minStableGasPrice = 476190000000 # Minimum gas price
+    refreshRate = 6 hours          # How often to check for updates
+}
+```
+
+- **Source**: Retrieves the gas price from a specific smart contract
+- **Minimum Gas Price**: Ensures the miner uses a baseline price to avoid setting it too low
+- **Refresh Rate**: Updates the gas price
+
+**Example of HTTP_GET**
+```plaintext
+stableGasPrice {
+    enabled = true
+
+    source {
+        method = "HTTP_GET"
+        params {
+            url = "https://api.coingecko.com/api/v3/simple/price?ids=bitcoin&vs_currencies=usd"
+            jsonPath = "/bitcoin/usd"
+            timeout = 5 seconds
+        }
+    }
+
+    minStableGasPrice = 476190000000 # Minimum gas price
+    refreshRate = 6 hours          # How often to check for updates
+}
+```
+
 ## blockchain.config.name
 
-A string that describe the name of the configuration.
+A string that describes the name of the configuration.
 We use:
 
 |  | `blockchain.config.name` |