on the translation of Euro rate -> cryptocurrency rate

I have a strong desire to want to include a variability adjustment to that converstion.

e.g. on a recent quote for a contract I gave NZD and BTC rates, and for the BTC rate I decided to quote the equivalent of my NZD rate + 30% (an arbitrary number that I guessed the market could easily slump).

I guess the reverse could be true too... like the market goes up.