Brazil's central bank sold about $1.02 billion in an auction of currency swap contracts on Wednesday, rolling over securities that mature next month.
The bank sold 20,640 of 44,800 contracts on offer in the auction, extending the maturity of securities due on Jan. 2.
Brazil's currency, the real BRBY, was trading 0.7 percent stronger at 2.355 per dollar shortly after the auction.
The central bank resumed selling dollar swap contracts in October after a two-year hiatus, one of several measures it has taken to add liquidity to the financial system. It has also sold dollars from its international reserves on the spot currency market and dollar repurchase agreements.