Official Brazilian real exchange rates (PTAX) by API

Official PTAX buy and sell rates from Brazil's central bank for USD, EUR and other currencies against the real, for any business day, by API or MCP. Free.

Ask your agent

Convert these 14 USD invoices to reais using the PTAX sell rate of each invoice's date, and give me the total.

Paste this into Claude, ChatGPT or any agent connected to Superpowers.

Failed calls are freeReady to useWorks with your AI agent

What you get backFrom a real call on 10/10/2026 · Banco Central do Brasil (PTAX open data)

Result of three real lookups

What was the official dollar rate in Brazil on Oct 9, and how does it compare with the end of September?

Oct 9, 2026 closing PTAX: US$1 = R$ 4.9886 buy, R$ 4.9892 sell. The euro closed at R$ 5.5827 buy, R$ 5.5844 sell.
Sep 30, 2026 closing PTAX: R$ 5.1803 buy, R$ 5.1809 sell.
The dollar's sell rate fell 3.7% in seven business days. Each lookup took a quarter to three quarters of a second.

Response for USD on 2026-09-30 (run_LuryO9EaBNY28Q). quoted_at is Brasília time.

What comes back

What you get on every lookup, whichever source answers.

Three-letter currency code quoted against the real (USD, EUR, GBP, JPY...)
PTAX buy and sell rate, in reais per unit of the currency
Date and time of the bulletin, Brasília time
Bulletin type; closing is the official end-of-day PTAX

Providers

Same input and output for every provider. Success rate over 30 days shows after 5 real calls.

Provider	Price per call	Success	Status
Banco Central do Brasil	Free	100%	Available

Frequently asked questions

What is PTAX?

The reference exchange rate the Banco Central do Brasil publishes every business day from quotes by dealer banks. Brazilian contracts, invoices in foreign currency, accounting and taxes usually point to it, most often the closing sell rate.

Buy or sell: which one should I use?

It depends on the contract or rule you follow. For converting a foreign-currency amount into reais, many contracts and tax rules use the sell rate. Both come in every response.

What about weekends and holidays?

There is no PTAX on days the central bank does not publish one. Pass the date you need; leave it out to get the latest business day.

How much does it cost?

Nothing. PTAX lookups are free. You need an account for an API key, and the $5 welcome credit is there for the paid tools.

Can my AI agent use it?

Yes. Add the Superpowers MCP server to Claude, Cursor, Codex or ChatGPT and ask in plain words, or call POST /v1/run with the tool bcb.ptax. The Portuguese version of this guide is at /pt/api-ptax.

For developersAPI request, full response, returned fields and MCP setup

Get the PTAX rate, the Banco Central do Brasil's official buy and sell rate for a currency against the real, for today or any past business day. Free, from the API or your AI agent.

Returned fields

currencyThree-letter currency code quoted against the real (USD, EUR, GBP, JPY...)

buy / sellPTAX buy and sell rate, in reais per unit of the currency

quoted_atDate and time of the bulletin, Brasília time

bulletinBulletin type; closing is the official end-of-day PTAX

Request

curl -X POST https://superpowers.tools/v1/run \
  -H 'Authorization: Bearer $SUPERPOWERS_KEY' \
  -H 'content-type: application/json' \
  -d '{"tool":"bcb.ptax","idempotency_key":"example-1","input":{"currency":"USD","date":"2026-09-30"}}'

Normalized response

Call made on 10/10/2026 through Banco Central do Brasil (PTAX open data), answered in 736 ms. Response for USD on 2026-09-30 (run_LuryO9EaBNY28Q). quoted_at is Brasília time.

{
  "currency": "USD",
  "buy": 5.1803,
  "sell": 5.1809,
  "quoted_at": "2026-09-30 13:11:44.783262",
  "bulletin": "closing"
}

MCP configuration

Add the MCP server to Claude, Cursor or another client and ask in plain language.

Claude Code

claude mcp add --transport http superpowers https://superpowers.tools/mcp \
  --header "Authorization: Bearer $SUPERPOWERS_KEY"

Cursor (.cursor/mcp.json)

{
  "mcpServers": {
    "superpowers": {
      "url": "https://superpowers.tools/mcp",
      "headers": {
        "Authorization": "Bearer ${env:SUPERPOWERS_KEY}"
      }
    }
  }
}

Codex

codex mcp add superpowers --url https://superpowers.tools/mcp \
  --bearer-token-env-var SUPERPOWERS_KEY

Start with $5 of credit

This call is free; the credit covers the paid tools. No card needed to start.

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