Summary
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.
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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:
https://toolalize.com/mcp
Local (stdio)
npx toolalize-mcp
Or in an MCP client config (e.g. Claude Desktop):
{
"mcpServers": {
"toolalize": {
"command": "npx",
"args": ["-y", "toolalize-mcp"]
}
}
}
Tools
| Tool | Arguments | Description |
|---|---|---|
convert_units | value, from, to, category? | Convert between units of the same category. |
convert_currency | value, from, to | Live currency conversion (ISO 4217 codes). |
list_units | – | List all categories and units. |
All tools call the free public API at toolalize.com — no API key, no secrets.
Public HTTP API
You don't need MCP to use Toolalize programmatically:
GET https://toolalize.com/api/convert?value=10&from=cm&to=inGET https://toolalize.com/api/convert/currency?value=100&from=USD&to=EURGET https://toolalize.com/api/unitsGET https://toolalize.com/openapi.json
Develop
npm install
npm run build
TOOLALIZE_API_BASE=https://toolalize.com node dist/index.js
TOOLALIZE_API_BASE overrides the API host (default https://toolalize.com).
License
MIT © Vertisky
Featured
Integrate web data into your AI product. One API to scrape website & brand data.
Get API Key Now →belt cli automatically finds the best tools and skills for your agent. image, video, music, tts...
one prompt install →Give your AI agent a complete email layer—sending, inbound inboxes, and sandbox testing.
Get 4K emails/month free →Agent, run crypto. Access onchain data & trade routes via 1inch.
Install now →Notes, actions and memory. Without a meeting bot. First month 100% off.
Download for free →Your agent targets a perfect 10 Code Health score. Deterministic. Every commit.
Try For Free →