I like bittrex for trading between cryptos, but im missing option for trading with major currencies (usd,eur,gbp). Esspecialy last couple of days since all cryptos are dropping in price.
Thanks for advice
Well, you need to clarify that, you are looking for an altcoin exchange or just a forex broker? Usd/eur/gbp is just only in forex, not on gdax or any other one like bittrex.
Just use a forex broker if you are looking to trade currencies (normal currencies) a few of them let you use altcoins, but only the most important ones, like ethereum, litecoin, and bitcoin.