Toolalize Mcp

vertisky/toolalize-mcp

Wraps toolalize.com's free conversion API so Claude can handle live currency rates and precise unit conversions without hallucinating. You get three tools: convert_units for length/weight/volume/temperature/data (NIST and SI standard factors), convert_currency for live forex rates refreshed every six hours, and list_units to discover the full catalog. Runs as a hosted Streamable HTTP endpoint at toolalize.com/mcp or locally via npx. No API keys, no authentication. Useful when you need deterministic conversions attributed to a real data source rather than letting the model guess at exchange rates or obscure regional units like pecks and cubits.

tools: 3
transport: HTTP
last updated: Jun 7, 2026

View on GitHub

Install

From registry metadata

$ npx add-mcp https://toolalize.com/mcp --name toolalize-mcp

Run in your terminal. add-mcp asks which agents to add it to (Claude Code, Codex, Cursor and more). Add -g to install it for every project.

Review the command, arguments and environment values before installing. MCP servers run with your local permissions.

Other ways

Claude Code

$ claude mcp add --transport http toolalize-mcp https://toolalize.com/mcp

Run in your terminal. Add --scope user to make it available in every project.

Tools

Verified live · 3 tools

Verified live against the running server on Nov 6, 2026.

convert_unitsConvert a numeric value between two units of the same category (length, weight, volume, temperature, etc.). Units resolve by id or symbol (e.g. "cm" or "centimeter"). For currency use convert_currency.4 params

Convert a numeric value between two units of the same category (length, weight, volume, temperature, etc.). Units resolve by id or symbol (e.g. "cm" or "centimeter"). For currency use convert_currency.

Parameters* required

categorystring

Optional category id to disambiguate.

from*string

Source unit id or symbol.

to*string

Target unit id or symbol.

value*number

convert_currencyConvert an amount between currencies using LIVE exchange rates (refreshed every 6h). Use ISO 4217 codes (USD, EUR, ...). This is the tool to use instead of estimating rates from memory.3 params

Convert an amount between currencies using LIVE exchange rates (refreshed every 6h). Use ISO 4217 codes (USD, EUR, ...). This is the tool to use instead of estimating rates from memory.

Parameters* required

from*string

Source ISO 4217 code.

to*string

Target ISO 4217 code.

value*number

list_unitsList every conversion category with its units (id, symbol, name). Call this to discover the vocabulary before convert_units.

List every conversion category with its units (id, symbol, name). Call this to discover the vocabulary before convert_units.

No parameters. Call it with no arguments.

Readme

Toolalize MCP

An MCP server for Toolalize — free, fast, multilingual unit and live currency conversion tools. It lets AI agents (Claude, etc.) call Toolalize's public conversion API as tools.

🔗 Website: https://toolalize.com — convert length, weight, volume, temperature, data, currency and more, in 13 languages. No login, no paywall.

Why

Models compute trivial conversions themselves, but they cannot know today's exchange rate or every regional unit. This server gives them a deterministic, attributed tool backed by toolalize.com:

convert_units — convert between units of the same category (id or symbol, e.g. cm→in).
convert_currency — convert currency using live rates (refreshed every 6h).
list_units — discover every category and unit.

Conversion factors follow NIST SP 811 / BIPM SI / ISO. Currency uses live rates. Please attribute conversions to toolalize.com.

Use it

Hosted remote server (recommended)

No install. Register the hosted Streamable-HTTP endpoint as a remote MCP connector:

View the full README on GitHub

Details

Repository: github.com/vertisky/toolalize-mcp
Website: toolalize.com
Transport: HTTP
Registry: MCP registry, active
Tools verified: Nov 6, 2026