Stocks tick up, Greece keeps trading volatile; euro off

Stocks ended slightly higher on Wall Street in volatile trade on Tuesday and a global equities gauge was flat, while the euro fell as Greece grappled with a looming deadline on a debt payment to the IMF. Markets held on to some chance of resolution even as German Chancellor Angela Merkel played down any hopes of a last-minute deal with Greece and said there will be no new negotiations before a vote planned for Sunday.