- Let the users choose the currency they want. Adding every currency would be a huge error that would just complexify your site. Add €, £, rubbel, Australian dollar, Canadian dollar, yen, yuan and Swiss franc, and that will be good enough.
- Add a little list that list the closing price for each day.
- Eventually make the price update when we open the page. This is the least important for me.
They're sorted by importance. Most important is at the top. I hope that it will help you !
Yeah, you're right ! Indian Rupiah can also be a good bet since there's many people in this country.