Price formula guide
The formula consist of numerals, operators and variables. This is operators you can use in your formula: +, -, *, / and round brackets.
There is market data from various BTC exchanges for majorly traded currencies. The variable name consist of exchange identifier and currency code. For example, btceusd, bitstampusd, bitfinexusd.
You can get the exchange rates of 1 USD in other currencies. To convert other currencies into USD – use the inverse. For example, 1 / usd_in_eur.
Here is the correct formula: ((btceeur + btceusd * usd_in_eur) / 2) * 1.05.
BTC market data and USD exchange rates updates every 15 minutes and every hour respectively.