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I'd like to make estimations of the cost of an application, and one of the things I need is the price to store n kB of data on a contract. In ether and in USD.
Where could I find rates or prices of raw data storing? Sites showing ETH<->USD prices are rather easy to find but I can't seem to find an approximation of how much it would cost to store a certain amount of data.
The rates change pretty fast and a 2 years-old answer with "Right now, the fees are around ..." is helpful, but insufficient. Where could I get reliable, recent information about the rates?
Subsidiary question: When we store data on the blockchain, I understand that there's a price in gas for the transaction, and another price to actually put data in the blockchain (long term). Am I correct?