Dados B3 › Connector › Claude Code

Claude Code · plugin and MCP

Dados B3 in Claude Code

One command connects Claude Code to the Dados B3 MCP server. Claude then looks up public data from CVM (Brazil's securities regulator) and B3 (the Brazilian exchange) and answers with the link to the page each number came from.

What it gives

• Fundamentals of Brazilian listed companies from their CVM filings: ROE, ROIC, margins, debt, accounts with their CVM code.
• Multiples (P/E, P/B, EV/EBITDA) priced at the trading session when the filing became public.
• Dividends, dividend yield and total return over a period, with and without dividends reinvested.
• FIIs (Brazilian REITs), ETFs, BDRs and B3 indices.

Prices are end-of-day closes, not real-time quotes. The answers are past measurements, not investment advice. The open tools need no key.

Install

The plugin registers the MCP server and ships a skill that tells Claude when to use it and to cite the source page. In a Claude Code session (version 2.1.275 or later):

/plugin install dados-b3 --marketplace Val7h/dados-b3-mcp

Or in two steps:

/plugin marketplace add Val7h/dados-b3-mcp
/plugin install dados-b3@dados-b3

Only the MCP server, without the plugin, from your shell:

claude mcp add --transport http dados-b3 https://dadosb3.com/mcp

Example questions

1. What was PETR4's ROE in each year since 2015?
2. What did R$ 1,000 in ITUB4 turn into over the last 5 years, with dividends reinvested?
3. What is HGLG11's trailing 12-month dividend yield, and its P/B?

Other clients

Claude (app and web), ChatGPT, Cursor and other MCP clients: connector page. Plugin source: github.com/Val7h/dados-b3-mcp.