U.S. stock index futures edged lower on Friday, taking a pause from the previous session's rally that set Wall Street's main indexes on track for weekly gains after the Federal Reserve took a pivotal stance on monetary policy earlier in the week.

Wall Street romped to records Thursday as a delayed jubilation swept markets worldwide following the Federal Reserve’s big cut to interest rates. The S&P 500 jumped 1.7% for one of its best days of the year and topped its last all-time high set in July.