| Date | Bid | Offer |
|---|---|---|
| Apr 30 2013 | R$ 3.1095 | R$ 3.1106 |
| Apr 29 2013 | R$ 3.0977 | R$ 3.0988 |
| Apr 26 2013 | R$ 3.0948 | R$ 3.0960 |
| Apr 25 2013 | R$ 3.1042 | R$ 3.1052 |
| Apr 24 2013 | R$ 3.0877 | R$ 3.0888 |
| Apr 23 2013 | R$ 3.0784 | R$ 3.0796 |
| Apr 22 2013 | R$ 3.0748 | R$ 3.0759 |
| Apr 19 2013 | R$ 3.0626 | R$ 3.0636 |
| Apr 18 2013 | R$ 3.0795 | R$ 3.0806 |
| Apr 17 2013 | R$ 3.0408 | R$ 3.0419 |
| Apr 16 2013 | R$ 3.0468 | R$ 3.0479 |
| Apr 15 2013 | R$ 3.0295 | R$ 3.0308 |
| Apr 12 2013 | R$ 3.0365 | R$ 3.0377 |
| Apr 11 2013 | R$ 3.0388 | R$ 3.0397 |
| Apr 10 2013 | R$ 3.0326 | R$ 3.0337 |
| Apr 09 2013 | R$ 3.0410 | R$ 3.0421 |
| Apr 08 2013 | R$ 3.0355 | R$ 3.0364 |
| Apr 05 2013 | R$ 3.0714 | R$ 3.0726 |
| Apr 04 2013 | R$ 3.0694 | R$ 3.0708 |
| Apr 03 2013 | R$ 3.0631 | R$ 3.0642 |
| Apr 02 2013 | R$ 3.0485 | R$ 3.0499 |
| Apr 01 2013 | R$ 3.0736 | R$ 3.0747 |
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.