How to Use the BCB Câmbio — Dólar PTAX, Euro e 150+ Moedas MCP in LangChain

Q: How do I fetch historical rates with BCB Câmbio — Dólar PTAX, Euro e 150+ Moedas in LangChain?

Use the getdolarperiodo tool within your ReAct agent. Pass the start and end dates to get up to a year of PTAX data. The agent parses the returned JSON into your chain's state.

Q: Can LangChain agents look up specific currency codes using BCB Câmbio — Dólar PTAX, Euro e 150+ Moedas?

Yes. The agent calls listarmoedas to search the catalog. Once it finds the correct code like JPY or THB, it feeds that string into the next step.

Pipe official Brazilian exchange rates directly into LangChain workflows for automated financial pipelines.

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Connect BCB Câmbio — Dólar PTAX, Euro e 150+ Moedas MCP to LangChain

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Setup BCB Câmbio — Dólar PTAX, Euro e 150+ Moedas with LangChain

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Chain FX Conversions in LangChain

Your ReAct agent needs to convert a European invoice to Brazilian Reais. It calls `listar_moedas` to verify the EUR code exists in the Central Bank catalog. Then it pulls the exact buy and sell rates for the invoice date using `get_cotacao_moeda`. The output of that MCP Server call becomes the input for your next chain step. You calculate the final settlement amount and push it to your accounting database. LangSmith tracks the exact token usage and latency for every API request.

Build Financial Pipelines with PTAX Data

Hardcoding exchange rates breaks financial models. You establish this MCP connection so your LangChain agents pull official historical data using `get_dolar_periodo`. The agent requests up to a year of PTAX dollar quotes formatted as MM-DD-YYYY. For longer historical trends, the agent switches to `get_dolar_sgs`. It grabs series 1 for buy rates and 10813 for sell rates. The pipeline feeds those arrays directly into a Python REPL tool to generate volatility charts.

Automate Daily BRL/USD Settlements

Brazilian trade operations rely on the official PTAX reference rate. Your LangGraph state machine triggers a daily task that runs `get_cotacao_dolar` to fetch the central bank's official buy and sell values. Because LangChain handles the tool routing automatically, the agent decides if it needs the closing bulletin or just the intermediate rates. It extracts the exact float values and formats a settlement report without human intervention.

Setup guide

Set up BCB Câmbio — Dólar PTAX, Euro e 150+ Moedas MCP in LangChain

Prerequisites

Python 3.10+ installed
langchain-mcp-adapters + langgraph packages
Active Vinkius subscription with a valid endpoint token

1

Install dependencies
Run pip install langchain-mcp-adapters langgraph langchain-openai. The MCP adapters package converts MCP tools into native LangChain BaseTool objects.
2

Connect via HTTP transport
Use MultiServerMCPClient with "transport": "http" pointing to your Vinkius endpoint. Replace [YOUR_TOKEN_HERE] with your token from cloud.vinkius.com.
3

Create a ReAct agent
Pass the discovered tools to create_react_agent() from LangGraph. The agent automatically routes BCB Câmbio — Dólar PTAX, Euro e 150+ Moedas tool calls through the MCP protocol.
4

Run with any LLM
Swap ChatOpenAI for ChatAnthropic, ChatGoogleGenerativeAI, or any LangChain-compatible model. The MCP tools work identically across all providers.

agent.py

from langchain_mcp_adapters.client import MultiServerMCPClient
from langgraph.prebuilt import create_react_agent
from langchain_openai import ChatOpenAI

async with MultiServerMCPClient({
    "bcb-cambio-dolar-ptax-euro-e-150-moedas-mcp": {
        "transport": "http",
        "url": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp",
    }
}) as client:
    tools = client.get_tools()

    agent = create_react_agent(
        ChatOpenAI(model="gpt-4o"),
        tools,
    )
    result = await agent.ainvoke({
        "messages": "List recent BCB Câmbio — Dólar PTAX, Euro e 150+ Moedas transactions"
    })
    print(result["messages"][-1].content)

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Independent Platform Disclaimer: Vinkius is an independent platform and is not affiliated with, endorsed by, sponsored by, verified by, or otherwise authorized by Banco Central do Brasil. All third-party trademarks, logos, and brand names are the property of their respective owners. Their use on this website is strictly for informational purposes to identify service compatibility and interoperability.

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Common questions about BCB Câmbio — Dólar PTAX, Euro e 150+ Moedas MCP in LangChain

Use the `get_dolar_periodo` tool within your ReAct agent. Pass the start and end dates to get up to a year of PTAX data. The agent parses the returned JSON into your chain's state.

Yes. The agent calls `listar_moedas` to search the catalog. Once it finds the correct code like JPY or THB, it feeds that string into the next step.

PTAX tools give you official daily reference rates with intraday bulletins. SGS tools like `get_dolar_sgs` provide longer historical time series for commercial dollar rates. Your LangChain logic dictates which one to call based on the requested date range.

Yes, full observability applies here. Every request to the Brazilian Central Bank API registers as a tool invocation in LangSmith. You see the exact payload the agent sent and the JSON response it received.

The integration only sends date strings and currency codes to the Vinkius endpoint. No proprietary financial data or internal invoice amounts leave your LangGraph environment. All V8 isolate sandboxes destroy themselves immediately after returning the Central Bank rates.

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