| Date | Bid | Offer |
|---|---|---|
| May 30 2018 | R$ 3.7764 | R$ 3.7789 |
| May 29 2018 | R$ 3.7557 | R$ 3.7578 |
| May 28 2018 | R$ 3.7329 | R$ 3.7353 |
| May 25 2018 | R$ 3.6895 | R$ 3.6919 |
| May 24 2018 | R$ 3.6731 | R$ 3.6741 |
| May 23 2018 | R$ 3.6670 | R$ 3.6683 |
| May 22 2018 | R$ 3.6768 | R$ 3.6782 |
| May 21 2018 | R$ 3.7144 | R$ 3.7157 |
| May 18 2018 | R$ 3.7599 | R$ 3.7620 |
| May 17 2018 | R$ 3.6809 | R$ 3.6826 |
| May 16 2018 | R$ 3.6771 | R$ 3.6792 |
| May 15 2018 | R$ 3.6751 | R$ 3.6760 |
| May 14 2018 | R$ 3.6174 | R$ 3.6184 |
| May 11 2018 | R$ 3.5714 | R$ 3.5734 |
| May 10 2018 | R$ 3.5423 | R$ 3.5442 |
| May 09 2018 | R$ 3.5780 | R$ 3.5800 |
| May 08 2018 | R$ 3.5714 | R$ 3.5734 |
| May 07 2018 | R$ 3.5360 | R$ 3.5380 |
| May 04 2018 | R$ 3.5274 | R$ 3.5294 |
| May 03 2018 | R$ 3.5546 | R$ 3.5562 |
| May 02 2018 | R$ 3.5496 | R$ 3.5516 |
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.