
The Brazilian Central Bank sold USD 1.5 billion in currency swaps on August 30, 2018, after the dollar briefly rose above BRL 4.20. The dollar then fell back to about BRL 4.146, still up 0.78% on the day.
The Ibovespa closed down 2.53%.
Central bank intervention to defend the real lowers Brazil's import costs and supports local feed and grain input prices in reais. It also signals that Brazilian currency stress is easing for now, which can reduce pressure on Brazilian export selling.
After 213 past bearish macro events, Brazilian Real (BRL per USD) moved a median -0.2% over 5 sessions (46% higher; middle half -1.5% to +0.9%), and +0.2% over 20.
Moves of each commodity's benchmark from the last close before the event. Historical reads pool past events of the same kind; they describe what happened, not what will. Not investment advice.