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?
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.