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Unit Converter API

br0ski777/unit-converter-x402

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.

tool
1
transport
SSE
last updated
May 16, 2026
View on GitHub

Tools

1 tools

Public tool metadata for what this MCP can expose to an agent.

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
categorystring
Optional category hint: length, weight, temperature, volume, speed, data
fromstring
Source unit (e.g. km, lb, celsius, l, mph, MB)
tostring
Target unit (e.g. mi, kg, fahrenheit, gal, km/h, GB)
valuenumber
The numeric value to convert

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Readme

Unit Converter API

MCP Server x402 License: MIT

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

View the full README on GitHub

Details

Repository
github.com/br0ski777/unit-converter-x402
Website
github.com/Br0ski777/unit-converter-x402
Category
Data & Analytics
Transport
SSE
Registry
MCP registry, active

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