I would like to get the historical Gas (Gwei) price in hourly or minutely with safelow, Standard, fast and fastest. I am aware of the etherscan.io which gives avg gas price for a day and also ethstation which gives realtime data. I am able to get the real-time from https://www.etherchain.org/tools/gasPriceOracle. Is there a way where i can get historical prices?
You can follow this website they have provided their API as well click here
and you can get a lot of other detailed information as well
The closest you can get is using this graph of historical gas prices.
Unless somebody has been storing the data you are asking for in a database, you will not be able to retrieve it. You can, however, run the same algorithm that ethgasstation.info uses on the graph above and interpolate the data, if desired.