Hi,
My programming is limited so don't understand a lot of what you supplied, sorry...
Can you explain what would need to be done to achieve:
On the WiFi Setup page have a dropdown box
Label = "Select Currency:"
Options = "BTC,XLM,ATLAS"
Values = "btc-api-url,xlm-api-url,atlas-api-url"
When selected and saved, variable 'Currency=value' is saved to eeprom
Then in main code (after a reboot & connection to network specified in setup) be able to use the variable 'Currency' ie the api url of the currency chosen at setup.