This API endpoint, Historical Gas Fee By Hour, retrieves the average maximum gas fee on a block explorer for every hour within a specified date range. Two parameters are required for this query. The 'dates' parameter, which is a range of datetime with seconds, and the 'network' parameter, a query that signifies the network the block resides in. The API then conducts an SQL operation on these parameters, converting the date range into Unix timestamps and using the network specified to filter the required transactions. The outcome of this query provides a table with each row representing an hour of a date within the range, and the average maximum gas fee for that hour. This data output is further visualised in a chart - 'Average Gas Fee By Hour', aiding the understanding of gas fee trends across each hour in the specified date range.