US equity futures were flat ahead of Wednesday's opening bell as traders digested economic growth data ahead of the Federal Reserve's monetary policy decision.

Dow Jones Industrial Average futures were flat, S&P 500 futures were 0.1% higher and Nasdaq futures were up 0.2%.

The policy-setting Federal Open Market Committee is scheduled to release a statement at the conclusion of its two-day meeting at 2 pm ET.

Oil prices were little changed, with front-month global benchmark North Sea Brent crude up 0.1% at $71.70 per barrel and US West Texas Intermediate crude 0.2% higher at $69.37 per barrel.

The ADP Institute's employment report, released at 8:15 am ET, showed a monthly 104,000 increase in private payrolls for July following a 23,000 decrease in the prior month, compared with estimates compiled by Bloomberg for a 76,000 increase.

The gross domestic product report, released at 8:30 am ET, showed a 3% annual growth for Q2 versus a 0.5% decrease in Q1, compared with estimates for a 2.6% increase.

The pending home sales index, due at 10 am ET, is seen coming in at a 0.2% uptick for June versus May's 1.8% increase.

In other world markets, Japan's Nikkei closed 0.05% lower, Hong Kong's Hang Seng ended 1.4% lower, and China's Shanghai Composite finished 0.2% higher. Meanwhile, the UK's FTSE 100 was down 0.2%, and Germany's DAX index was up 0.1% in Europe's early afternoon session.

In equities, LendingClub (LC) shares were 26% higher pre-bell after the company reported late Tuesday higher Q2 earnings and sales.

On the losing side, ProPetro (PUMP) stock was down 13% after the company reported a wider Q2 loss amid lower revenue.