# Unit & FX Calculator MCP for AI Agents AI Agent Connect

> Unit & FX Calculator stops your AI from making math mistakes. It handles physical unit conversions (like km/h to mph) using a real math engine and grabs live currency rates from the European Central Bank. No more hallucinated exchange rates or rounded errors in your calculations.

## Overview
- **Category:** productivity
- **Price:** Free
- **Endpoint:** https://edge.vinkius.com/vk_preview_476bw3fXfTKTHQA1s2rVLxiUwqeHoQaHaBAIV6p5/ai-agent-connect
- **Tags:** currency-exchange, fx-rates, unit-conversion, financial-data, real-time-rates

## Description

The Unit & FX Calculator MCP fixes one of the biggest issues with AI agents: their tendency to hallucinate math. LLMs often struggle with compound conversions like moving from km/h to mph with specific rounding, and they frequently guess foreign exchange rates based on old training data. This Connector bridges that gap by giving your agent access to a real math engine and live market data. It handles physical units like length, mass, volume, temperature, and speed using a dedicated library for absolute precision. For currency, it pulls the latest European Central Bank reference rates from a live API. To keep things fast and avoid hitting rate limits, it caches these rates for one hour. This means you can run large batches of conversions instantly. You'll find this is a key addition to the Vinkius catalog for anyone who needs reliable, deterministic numbers for professional workflows.

## Tools

### batch_convert
Convert a list of physical units in one request for high-speed processing. This is useful for handling large datasets.

### convert_unit
Turn a single value from one unit to another using a deterministic math engine. It ensures precise decimal results.

### get_rate
Fetch the latest currency exchange rate between two specific countries. It uses a live API and a local cache.

## Prompt Examples

**Prompt:** 
```
Convert 150 kg to pounds and tell me the current USD to EUR rate.
```

**Response:** 
```
**Conversion Results:**
* 150 kg = **680.39 lbs**

**Live Exchange Rate:**
* 1 USD = **0.92 EUR**
*(Rate fetched from European Central Bank)*
```

**Prompt:** 
```
I have a list of 5 temperatures in Celsius: 20, 25, 30, 35, 40. Convert them to Fahrenheit.
```

**Response:** 
```
**Temperature Conversions:**
* 20°C = **68.0°F**
* 25°C = **77.0°F**
* 30°C = **86.0°F**
* 35°C = **95.0°F**
* 40°C = **104.0°F**
```

**Prompt:** 
```
How much is 500 Euros in Japanese Yen right now?
```

**Response:** 
```
**Currency Conversion:**
* 500 EUR = **74,250 JPY**
*(Based on the latest reference rate)*
```

## Capabilities

### Convert physical units
Turn values like Celsius to Fahrenheit or liters to gallons accurately.

### Fetch live exchange rates
Get the current market rate between two different currencies.

### Batch process conversions
Handle a long list of unit changes in one go without losing precision.

### Cache currency data
Access previously fetched rates instantly to save on API calls.

### Use deterministic math
Rely on a real math engine instead of the AI's internal guesswork.

## Use Cases

### International Shipping
A logistics lead asks to convert 500kg of cargo into pounds and check the shipping cost in Euros.

### Travel Planning
A user wants to know the cost of a hotel in Japan converted to USD based on today's rates.

### Engineering Specs
A builder needs to convert a specific volume of concrete from cubic meters to cubic yards.

### E-commerce Pricing
A store owner wants to see a list of 20 products with their prices converted to multiple currencies.

## Benefits

- Eliminate Hallucinations: Stop your agent from guessing exchange rates. Use get_rate to get the actual numbers from the European Central Bank.
- Precise Math: convert_unit uses a dedicated math engine, so you get exact decimal results for complex conversions like speed or volume.
- High Speed Batching: Use batch_convert to process dozens of units at once without waiting for multiple round trips.
- Efficient API Usage: The 1-hour cache on FX rates means your agent won't hit limits when doing heavy lifting.
- Consistent Results: You get the same mathematical output every time, which is essential for professional workflows.

## How It Works

The bottom line is you get guaranteed mathematical accuracy for units and money.

1. Connect your AI client to the Unit & FX Calculator MCP through Vinkius.
2. Ask your agent to perform a specific conversion or fetch a current rate.
3. Receive a precise, mathematically correct result in your chat or workspace.

## Frequently Asked Questions

**Can Unit & FX Calculator handle complex unit types?**
Yes, it handles length, mass, volume, temperature, and speed. It provides precise conversions for all these categories.

**Is the exchange rate live?**
It pulls from the European Central Bank and caches for one hour. This ensures you get accurate data without hitting API limits.

**Will it make math mistakes?**
No, it uses a dedicated math engine instead of the AI's internal logic. This ensures every calculation is mathematically sound.

**Can I convert many units at once?**
Yes, you can use the batch conversion tool to process a list of units in a single step, making it much faster for large datasets.

**What currencies does it support?**
It supports the currencies provided by the Frankfurter API, which includes most major global currencies.

**Is there a limit on how many conversions I can do?**
It is designed for high volume. The built-in caching feature helps keep things fast and efficient even when you are doing many conversions.

**How often are currency rates updated?**
Rates are fetched live and cached for exactly 1 hour.

**What physical units are supported?**
Length, mass, volume, temperature, and speed are fully supported via mathjs.

**Can it batch convert an array of data?**
Yes, the batch processor can handle large JSON arrays instantly.