| Date | Bid | Offer |
|---|---|---|
| Jul 31 2017 | R$ 0.4977 | R$ 0.4979 |
| Jul 28 2017 | R$ 0.4971 | R$ 0.4973 |
| Jul 27 2017 | R$ 0.4938 | R$ 0.4939 |
| Jul 26 2017 | R$ 0.4950 | R$ 0.4953 |
| Jul 25 2017 | R$ 0.4944 | R$ 0.4946 |
| Jul 24 2017 | R$ 0.4924 | R$ 0.4926 |
| Jul 21 2017 | R$ 0.4897 | R$ 0.4899 |
| Jul 20 2017 | R$ 0.4911 | R$ 0.4913 |
| Jul 19 2017 | R$ 0.4882 | R$ 0.4884 |
| Jul 18 2017 | R$ 0.4929 | R$ 0.4931 |
| Jul 17 2017 | R$ 0.4906 | R$ 0.4908 |
| Jul 14 2017 | R$ 0.4911 | R$ 0.4913 |
| Jul 13 2017 | R$ 0.4914 | R$ 0.4915 |
| Jul 12 2017 | R$ 0.4949 | R$ 0.4950 |
| Jul 11 2017 | R$ 0.4997 | R$ 0.4999 |
| Jul 10 2017 | R$ 0.5002 | R$ 0.5004 |
| Jul 07 2017 | R$ 0.5040 | R$ 0.5041 |
| Jul 06 2017 | R$ 0.5071 | R$ 0.5073 |
| Jul 05 2017 | R$ 0.5058 | R$ 0.5060 |
| Jul 04 2017 | R$ 0.5041 | R$ 0.5044 |
| Jul 03 2017 | R$ 0.5045 | R$ 0.5047 |
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.