The dollar index ended little changed on Friday as it stayed on track for a record eighth month of gains on improving U.S. data and comments from Federal Reserve officials that bolstered bets for a interest rate rise later this year.

This measure of the greenback against the euro, yen and four other currencies was set to mark its longest streak of monthly gains since the greenback was floated as a fiat currency in 1971. February's gain of about 0.52 percent, however, was the smallest of the eight months.