As far as I know they only accept BTC. Official conversion fee mentioned on their website is low I guess it was something like 1-3% but in reality when you try to load the card for me it was around 100EUR for 1000EUR (converted from BTC) which is kinda high 
Wow, 10% that is really high. The Wavecrest cards was kinda low. Bitwala 1.5% or so to their wavecrest card, and Xapo, I think was about 4% on their system that deducted directly from BTC balance.