I think XAUUSD is an OTC product (CFD) with storage cost of 0.1% per year.
With EUR100000 to invest USD100000 in XAUUSD one can with EURUSD spot of 1.14:
1/ Sell EUR87719 and buy USD100000 (select FXCONV and specify either the base currency quantity or the Fx currency quantity).
Invest USD100K...