The Group of 20 finance ministers and central bankers meeting will be in session starting Friday.

Prior to Thursday's opening, the People's Bank of China set the midpoint rate of yuan at 6.6872 per US dollar, 0.11 percent firmer than the previous fix of 6.6946.

The spot yuan opened at 6.6818 per dollar and was changing hands at 6.6780 at midday, firming 0.02 percent from the previous close. The yuan fell through the psychologically important 6.7 level on Monday.