| Date | Bid | Offer |
|---|---|---|
| Jul 31 2015 | R$ 3.7419 | R$ 3.7429 |
| Jul 30 2015 | R$ 3.6721 | R$ 3.6731 |
| Jul 29 2015 | R$ 3.6831 | R$ 3.6851 |
| Jul 28 2015 | R$ 3.7368 | R$ 3.7386 |
| Jul 27 2015 | R$ 3.7275 | R$ 3.7295 |
| Jul 24 2015 | R$ 3.6486 | R$ 3.6503 |
| Jul 23 2015 | R$ 3.6043 | R$ 3.6053 |
| Jul 22 2015 | R$ 3.4921 | R$ 3.4934 |
| Jul 21 2015 | R$ 3.4752 | R$ 3.4762 |
| Jul 20 2015 | R$ 3.4872 | R$ 3.4882 |
| Jul 17 2015 | R$ 3.4515 | R$ 3.4535 |
| Jul 16 2015 | R$ 3.4183 | R$ 3.4192 |
| Jul 15 2015 | R$ 3.4565 | R$ 3.4575 |
| Jul 14 2015 | R$ 3.4390 | R$ 3.4403 |
| Jul 13 2015 | R$ 3.4807 | R$ 3.4823 |
| Jul 10 2015 | R$ 3.5552 | R$ 3.5568 |
| Jul 09 2015 | R$ 3.5444 | R$ 3.5460 |
| Jul 08 2015 | R$ 3.5732 | R$ 3.5743 |
| Jul 07 2015 | R$ 3.4824 | R$ 3.4840 |
| Jul 06 2015 | R$ 3.4803 | R$ 3.4813 |
| Jul 03 2015 | R$ 3.4685 | R$ 3.4701 |
| Jul 02 2015 | R$ 3.4557 | R$ 3.4577 |
| Jul 01 2015 | R$ 3.4559 | R$ 3.4569 |
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.