Can you trade say the euro/$ 24/7 or is it only tradeable at certain times? If so, what are those times best to trade? Thank you
You can trade 24/7 but outside of market hours the spreads widen and might make it more difficult to trade. Some say the best time to trade EUR/USD is early morning here because that is when there is a overlap between European and U.S. market but I have never noticed any difference.
24/5. Activity over the weekend is non-existent. Most will tell you best time to trade is during European market hours, 2am - 12 noon ET. More than 50% of ALL currency trading activity is done during these hours.
Also, as far as I know (but I may wrong), it's not really 7 days a week, since there's a time between the close of New York on Friday and open in Asia on Monday, when no trading takes place.
Oanda has a good forex hours graph. Be sure you have your proper time zone entered. London open has good moves, I've lost $ there. NY open is usually pretty smooth, lost some $ there. Asian open has some action, lost $ there, etc.