
Why AI Safety Auditors Are Flooding Reviewers With False Alarms
AI auditors catch errors but trigger false alarms
Pick the currency and date to convert using Brazil's Central Bank official PTAX exchange rate.
The rate used here is the PTAX closing rate, the same official reference banks and companies use for contracts and financial statements — not the buy/sell rate charged by exchange bureaus or travel cards, which add a spread on top of it.
Fetching rate...
PTAX closing rate, Brazil's Central Bank official reference — not the buy/sell rate charged by banks, exchange bureaus or international cards, which add spread and extra fees on top of this value.
It's the official exchange rate calculated and published by Brazil's Central Bank every business day, based on an average of interbank foreign exchange operations. It's the reference used in contracts, accounting statements and for tax purposes.
Banks, exchange bureaus and international cards charge a spread (margin) on top of the PTAX rate, plus a tax (IOF) on some operations. PTAX is the 'raw' reference, without those commercial margins.
There's no currency trading on Saturdays, Sundays and holidays. In those cases, the tool automatically shows the rate from the last available business day before the chosen date.
Directly from Brazil's Central Bank, through BrasilAPI (a free, open aggregator of official public data).

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