bcb-br-mcp：在 Cursor 中接入巴西央行数据（Selic、IPCA、汇率、Focus、PTAX），每个答案都带数据来源

If you build anything that touches the Brazilian economy — pricing, fintech, reports, research — your agent eventually needs the official numbers from the Banco Central do Brasil: the Selic rate, IPCA inflation, exchange rates, GDP, credit aggregates, the Focus market-expectations survey and the PTAX reference rates.

bcb-br-mcp is an open-source MCP server that gives Cursor those numbers straight from the BCB’s public APIs, with 17 tools and no API key.

Add it to Cursor — .cursor/mcp.json in your project (or the global one):

{
  "mcpServers": {
    "bcb-br": {
      "command": "npx",
      "args": ["-y", "bcb-br-mcp"]
    }
  }
}

Or point Cursor at the hosted endpoint, nothing to install:

https://bcb.sidneybissoli.com/mcp

What you can ask the agent

• “What is the current Selic rate and the accumulated IPCA over 12 months?”
• “Give me the USD/BRL PTAX for every business day of March 2026.”
• “What does the Focus survey expect for IPCA in 2026 and 2027?”
• “Deflate this series of nominal revenue to constant 2025 reais.”
• “Compare credit to households and credit to companies since 2020.”

Why I built it instead of letting the model call the REST API directly

The BCB APIs have sharp edges that silently produce wrong numbers: the time-series endpoint caps daily series at 10 years and returns an HTML page with HTTP 200 for unknown codes; ultimos/N returns some series newest-first and others oldest-first; price indexes (IPCA, IGP-M) are published as monthly rates, so “last minus first” gives nonsense (it reported +23.8% for IPCA 2024 when the real figure was 4.83%); the PTAX endpoint wants dates as MM-DD-YYYY and returns zero rows, not an error, otherwise. The server handles all of that on its side.

Every response carries a provenance block: the series, the period, the canonical URL that reproduces the query, the real extraction timestamp and the licence (ODbL). What the BCB published comes out verbatim; anything computed (variation, correlation, deflation) is marked as derived, with the convention used.

• Repo: GitHub - SidneyBissoli/bcb-br-mcp: MCP server for Brazil Central Bank (BCB) data — Selic, IPCA, exchange rates, GDP for AI agents · GitHub
• npm: https://www.npmjs.com/package/bcb-br-mcp
• Tool descriptions are in Portuguese (the users are mostly Brazilian); the agent handles them fine in English prompts.

Happy to hear what other Brazilian public data you would want an agent to reach.