| Date | Bid | Offer |
|---|---|---|
| Jul 31 2018 | R$ 3.7934 | R$ 3.7947 |
| Jul 30 2018 | R$ 3.7574 | R$ 3.7591 |
| Jul 27 2018 | R$ 3.7375 | R$ 3.7396 |
| Jul 26 2018 | R$ 3.7466 | R$ 3.7475 |
| Jul 25 2018 | R$ 3.7316 | R$ 3.7344 |
| Jul 24 2018 | R$ 3.7656 | R$ 3.7670 |
| Jul 23 2018 | R$ 3.8180 | R$ 3.8202 |
| Jul 20 2018 | R$ 3.7992 | R$ 3.8017 |
| Jul 19 2018 | R$ 3.8767 | R$ 3.8781 |
| Jul 18 2018 | R$ 3.8487 | R$ 3.8501 |
| Jul 17 2018 | R$ 3.8688 | R$ 3.8710 |
| Jul 16 2018 | R$ 3.8666 | R$ 3.8687 |
| Jul 13 2018 | R$ 3.8623 | R$ 3.8645 |
| Jul 12 2018 | R$ 3.8512 | R$ 3.8533 |
| Jul 11 2018 | R$ 3.8662 | R$ 3.8684 |
| Jul 10 2018 | R$ 3.8725 | R$ 3.8750 |
| Jul 09 2018 | R$ 3.8976 | R$ 3.9004 |
| Jul 06 2018 | R$ 3.9635 | R$ 3.9657 |
| Jul 05 2018 | R$ 3.9478 | R$ 3.9488 |
| Jul 04 2018 | R$ 3.9284 | R$ 3.9306 |
| Jul 03 2018 | R$ 3.9208 | R$ 3.9230 |
| Jul 02 2018 | R$ 3.9249 | R$ 3.9271 |
Source: Brazilian Central Bank
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Ptax is the main reference rate for the US Dollar in Brazil. It's published daily by the Brazilian Central Bank based on the quotes received from the major foreign exchange dealers in the Brazilian market. It's released by 1 PM (GMT-3) every business day.