Wall Street's main indexes opened higher on Wednesday with the benchmark S&P 500 and the Nasdaq hitting record highs, underpinned by growing optimism that the Federal Reserve could restart its monetary policy easing cycle next month.

Signs that U.S. taxes on imports have not fully filtered into headline consumer prices sparked a relief rally on Wall Street in the previous session, with the benchmark S&P 500 marking its first record high close in two weeks.