Summary
Converts units across length, weight, temperature, volume, speed, and data sizes through a remote API endpoint. The server uses server-sent events transport and requires x402 micropayments, so you'll need to handle the payment integration to use it. The GitHub repo is pretty bare, just configuration files without exposed implementation details or documentation about available conversion functions. You'd reach for this if you want unit conversion as a service rather than a local library, though the micropayment requirement means every conversion call has a cost attached. The remote API setup means no local dependencies, but also no visibility into what conversions are actually supported or how precise they are.
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Public tool metadata for what this MCP can expose to an agent.
1 tools
utility_convert_unitsUse this when you need to convert between measurement units. Returns the conversion result with formula in JSON. Returns: 1. result (converted value) 2. from and to units 3. inputValue 4. formula (hu4 params
Use this when you need to convert between measurement units. Returns the conversion result with formula in JSON. Returns: 1. result (converted value) 2. from and to units 3. inputValue 4. formula (hu
Parameters* required
categorystringOptional category hint: length, weight, temperature, volume, speed, data
fromstringSource unit (e.g. km, lb, celsius, l, mph, MB)
tostringTarget unit (e.g. mi, kg, fahrenheit, gal, km/h, GB)
valuenumberThe numeric value to convert
Unit Converter API
Convert between units -- length, weight, temperature, volume, speed, data storage. Formula included. Pay-per-call via x402 (USDC on Base L2) -- no API key, no signup, no rate-limit wall.
Part of the klymax402 marketplace -- 100 x402 micropayment APIs for AI agents, one wallet, USDC on Base.
Quickstart -- MCP
Add to your MCP client config (Claude Desktop, Cursor, ElizaOS, etc.):
{
"mcpServers": {
"unit-converter": {
"url": "https://unit-converter.api.klymax402.com/mcp"
}
}
}
Quickstart -- HTTP (x402)
curl -X POST "https://unit-converter.api.klymax402.com/api/convert" \
-H "Content-Type: application/json" \
-d '{"value":"1","from":"...","to":"..."}'
# -> 402 Payment Required, with an x402 payment challenge in the response body
Any x402-aware client (@x402/fetch, x402-agent-tools, ATXP) handles the 402 -> sign -> retry cycle automatically.
Tools
| Tool | Method | Path | Price | Description |
|---|---|---|---|---|
utility_convert_units | POST | /api/convert | $0.003 | Convert a value between measurement units |
utility_convert_units
Use this when you need to convert between measurement units. Returns the conversion result with formula in JSON.
Parameters
| Name | Type | Required | Description |
|---|---|---|---|
value | number | yes | The numeric value to convert |
from | string | yes | Source unit (e.g. km, lb, celsius, l, mph, MB) |
to | string | yes | Target unit (e.g. mi, kg, fahrenheit, gal, km/h, GB) |
category | string | no | Optional category hint: length, weight, temperature, volume, speed, data |
Example response:
{"inputValue":100,"from":"km","to":"mi","result":62.1371,"formula":"100 km * 0.621371 = 62.1371 mi","category":"length"}
When to use: unit conversions in calculations, data analysis, scientific computing, recipe scaling, and engineering applications.
Not for: currency conversion (use finance_convert_currency), timezone conversion (use utility_convert_timezone), stock prices (use finance_get_stock_price).
Example agent prompts
- "Convert between measurement units"
Payment
- Protocol: x402 -- HTTP-native pay-per-call, no signup, no API key
- Network: Base L2 (
eip155:8453) - Asset: USDC
- Facilitator: Coinbase CDP (primary), PayAI (fallback)
- Also reachable via ATXP (OAuth-wrapped x402, RFC 9728 protected-resource metadata)
Part of klymax402
100 x402 micropayment APIs for AI agents -- one wallet, USDC on Base, zero signup.
- Catalog: https://klymax402.com/llms.txt
- Full API reference: https://klymax402.com/llms-full.txt
- Live stats: https://klymax402.com/stats
License
MIT
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