| Date | Bid | Offer |
|---|---|---|
| Apr 30 2018 | R$ 3.4805 | R$ 3.4811 |
| Apr 27 2018 | R$ 3.4670 | R$ 3.4676 |
| Apr 26 2018 | R$ 3.4971 | R$ 3.4977 |
| Apr 25 2018 | R$ 3.5034 | R$ 3.5040 |
| Apr 24 2018 | R$ 3.4661 | R$ 3.4667 |
| Apr 23 2018 | R$ 3.4415 | R$ 3.4421 |
| Apr 20 2018 | R$ 3.4096 | R$ 3.4101 |
| Apr 19 2018 | R$ 3.3971 | R$ 3.3977 |
| Apr 18 2018 | R$ 3.3838 | R$ 3.3844 |
| Apr 17 2018 | R$ 3.4035 | R$ 3.4041 |
| Apr 16 2018 | R$ 3.4257 | R$ 3.4263 |
| Apr 13 2018 | R$ 3.4099 | R$ 3.4105 |
| Apr 12 2018 | R$ 3.3852 | R$ 3.3858 |
| Apr 11 2018 | R$ 3.4046 | R$ 3.4052 |
| Apr 10 2018 | R$ 3.4189 | R$ 3.4195 |
| Apr 09 2018 | R$ 3.3897 | R$ 3.3903 |
| Apr 06 2018 | R$ 3.3660 | R$ 3.3666 |
| Apr 05 2018 | R$ 3.3190 | R$ 3.3196 |
| Apr 04 2018 | R$ 3.3532 | R$ 3.3538 |
| Apr 03 2018 | R$ 3.3133 | R$ 3.3139 |
| Apr 02 2018 | R$ 3.3098 | R$ 3.3104 |
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.