Hello,
The base for the price is the (EUR).
Payment can be in Bitcoin or via SEPA. I prefer Bitcoin payment with Bidding starts with 5 per Chip. Bid for min and max amount of chips and a price per chip in . By using template:
If you want to pay in XBC (bitcoin), rate is calculated from bitcoin.de. Check
https://bitcoinwisdom.com/markets/bitcoinde/btceuror
https://www.bitcoin.de/en/chart for 12h weighted average quotation.