Reading files is FREE. So any indication would be 0.0000000 SAFEcoin.
If an APP wishes to charge for giving files/information (somehow) then its up to the APP and I am sure the method of showing costs will be similar to the clearnet and will evolve.
There has been some basic discussions on this but nothing like whats needed. So yes we need to discuss this.
As a bit of background, it has been suggested that the display could come from a wallet APP. I expect that there will be many wallet APPs. Now the way the APP knows that coin has been received is by the system message that is sent to your payment ID when the network assigns that ID to a coin.
For buying resource you (your wallet APP) has to send a coin to the network (spend) which is destroyed. Currently the concept is that that coin will purchase a “PUT Balance” which is decremented by the current PUT cost each time you do a PUT. In order to track this the core software will have to have an api to retrieve this info. And then the browser or wallet APP can display/track this.
For earning this (from farming) this would be via api calls (to be implemented but promised) and displayed separately to the safe browser/apps. Of course the wallet APP could indicate that the payment ID address has “received” a coin each time farming earnt a coin.
@bochaco created a wallet mock up. I don’t know what sort of displays he included.
I would expect that the displaying of spending and receiving/earning will be by the wallet APP since any account can have multiple payment IDs and if one wants it in the browser then a Addon can help.