| Date | Bid | Offer |
|---|---|---|
| Jul 31 2013 | R$ 0.3505 | R$ 0.3509 |
| Jul 30 2013 | R$ 0.3473 | R$ 0.3475 |
| Jul 29 2013 | R$ 0.3490 | R$ 0.3493 |
| Jul 26 2013 | R$ 0.3472 | R$ 0.3474 |
| Jul 25 2013 | R$ 0.3450 | R$ 0.3452 |
| Jul 24 2013 | R$ 0.3438 | R$ 0.3440 |
| Jul 23 2013 | R$ 0.3449 | R$ 0.3452 |
| Jul 22 2013 | R$ 0.3449 | R$ 0.3450 |
| Jul 19 2013 | R$ 0.3416 | R$ 0.3419 |
| Jul 18 2013 | R$ 0.3376 | R$ 0.3378 |
| Jul 17 2013 | R$ 0.3396 | R$ 0.3398 |
| Jul 16 2013 | R$ 0.3387 | R$ 0.3390 |
| Jul 15 2013 | R$ 0.3370 | R$ 0.3372 |
| Jul 12 2013 | R$ 0.3392 | R$ 0.3395 |
| Jul 11 2013 | R$ 0.3385 | R$ 0.3389 |
| Jul 10 2013 | R$ 0.3348 | R$ 0.3352 |
| Jul 09 2013 | R$ 0.3325 | R$ 0.3329 |
| Jul 08 2013 | R$ 0.3328 | R$ 0.3331 |
| Jul 05 2013 | R$ 0.3319 | R$ 0.3323 |
| Jul 04 2013 | R$ 0.3381 | R$ 0.3386 |
| Jul 03 2013 | R$ 0.3379 | R$ 0.3382 |
| Jul 02 2013 | R$ 0.3349 | R$ 0.3351 |
| Jul 01 2013 | R$ 0.3343 | R$ 0.3347 |
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.