Unit Converter

Convert length, weight, volume, temperature, area, speed and data size.

Pay by wallet (x402) unit-convert

Example

Input

{
  "value": 100,
  "to_unit": "mi",
  "from_unit": "km"
}

Answer

{
  "value": 100,
  "result": 62.1371,
  "formula": "km → m → mi",
  "to_unit": "mi",
  "category": "length",
  "from_unit": "km"
}

Inputs

Field	Type	Required	What it is
`value`	number	Yes	Value to convert
`to_unit`	string	Yes	Target unit (e.g. mi, kg, °F)
`from_unit`	string	Yes	Source unit (e.g. km, lb, °C)

Output fields

How reliably each field appears in a successful answer.

Field	Type	Appears
`value`	number	Always (present in every successful answer)
`result`	number	Always (present in every successful answer)
`formula`	string	Always (present in every successful answer)
`to_unit`	string	Always (present in every successful answer)
`category`	string	Always (present in every successful answer)
`from_unit`	string	Always (present in every successful answer)

How to call it

The same tool through each route. MCP clients reach it through Strale’s server at https://api.strale.io/mcp; the call below is what the agent sends.

# Needs an API key. max_price_cents caps what this call may cost.
curl -X POST https://api.strale.io/v1/do \
  -H "Authorization: Bearer $STRALE_API_KEY" \
  -H 'Content-Type: application/json' \
  -d '{
    "capability_slug": "unit-convert",
    "inputs": {
      "value": 100,
      "to_unit": "mi",
      "from_unit": "km"
    },
    "max_price_cents": 2
  }'

{
  "tool": "strale_execute",
  "arguments": {
    "slug": "unit-convert",
    "inputs": {
      "value": 100,
      "to_unit": "mi",
      "from_unit": "km"
    },
    "max_price_cents": 2
  }
}

import { Strale } from "straleio";

const strale = new Strale({ apiKey: process.env.STRALE_API_KEY! });
const result = await strale.do({
  capability_slug: "unit-convert",
  inputs: {
    "value": 100,
    "to_unit": "mi",
    "from_unit": "km"
  },
  max_price_cents: 2,
});

import os
from straleio import Strale, DoRequest

strale = Strale(api_key=os.environ["STRALE_API_KEY"])
result = strale.do(DoRequest(
    capability_slug="unit-convert",
    inputs={
        "value": 100,
        "to_unit": "mi",
        "from_unit": "km",
    },
    max_price_cents=2,
))

# No account. The first request answers 402 with the price in USDC;
# an x402 client pays it from your wallet and repeats the request.
curl -i 'https://api.strale.io/x402/v2/unit-convert?value=100&to_unit=mi&from_unit=km'

Limitations

Specialist unit categories are not supported
Covers common unit categories (length, weight, volume, temperature, speed) — specialized units (e.g., radiation, magnetic flux) not supported
What to do instead: For unsupported unit types, use the conversion factor directly in your application logic