How to Use the Unit & FX Calculator MCP in LangChain

Q: Can I use Unit & FX Calculator with LangChain to process batches?

Yes. The batchconvert tool lets you pass multiple values at once. This keeps your chain efficient and makes sure all unit conversions happen in a single, deterministic operation.

Q: If I need a conversion in LangChain, does it handle both units and currency?

It handles both. Use convertunit or batchconvert for physical measurements, and use the dedicated getrate tool when you need to factor in foreign exchange rates.

Build Multi-Step Logic: Use Unit & FX Calculator with LangChain for complex, reliable data outputs.

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Connect Unit & FX Calculator MCP to LangChain

Create your Vinkius account to connect Unit & FX Calculator to LangChain and route execution through our secure gateway. The platform manages server hosting, runtime updates, and security layers. Configuration requires no manual server provisioning.

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Setup Unit & FX Calculator with LangChain

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Advanced Conversion Chains via LangChain

The `batch_convert` tool handles multiple physical unit conversions in one single pass. You feed it a list of values and units, and your agent gets back an exact set of converted measurements. This is perfect for building multi-step reasoning pipelines. Instead of running three separate calls, the agent makes one call to `batch_convert`, passing all required data at once.

Real-Time Currency Lookups with MCP Server

Need a live exchange rate? Use the `get_rate` tool. It pulls the exact foreign exchange rate between two currencies, cached for an hour to keep things fast. Your agent can call this tool when it detects a currency discrepancy in a document. The output provides the necessary factor—say, USD to EUR—which the subsequent step uses immediately.

Deterministic Unit Conversions in LangChain

The `convert_unit` function deterministically converts single physical units (like converting 'km/h' to 'mph'). It relies on mathjs, so you don't have to worry about fuzzy results. This tool is great for setting up complex agent logic. If the user input requires a conversion before proceeding—say, going from metric speed to imperial speed—the agent calls `convert_unit` first.

Setup guide

Set up Unit & FX Calculator 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 Unit & FX Calculator 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({
    "unit-fx-calculator-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 Unit & FX Calculator transactions"
    })
    print(result["messages"][-1].content)

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Common questions about Unit & FX Calculator MCP in LangChain

It prevents your chain from hallucinating math or exchange rates. The agent executes the tool call, gets a verifiable number back, and uses that precise output for the next step in the workflow.

Yes. The `batch_convert` tool lets you pass multiple values at once. This keeps your chain efficient and makes sure all unit conversions happen in a single, deterministic operation.

You'll primarily deal with physical measurements (e.g., meters, miles) and currency data. The `get_rate` tool specifically provides the exact exchange rate between two specified currencies.

It handles both. Use `convert_unit` or `batch_convert` for physical measurements, and use the dedicated `get_rate` tool when you need to factor in foreign exchange rates.

This server touches Physical Measurements and Currency Data. Since it's a deterministic calculation, the risk is low, but all inputs passed to `convert_unit` or `get_rate` are handled as sensitive context within your chain.

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