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x402 Utils – Unit Converter
x402
x402 Utils – Unit Converter is a paid API for AI agents from utils.kagurazaka.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-30).
Converts a numeric value from one physical or digital unit to another (e.g. miles to kilometres, Fahrenheit to Celsius, GB to MiB) using the mathjs unit system.
Price / call$0.001
Success—
StatusUnknown
How this service works
Convert a value between units of length, mass, volume, temperature, speed, area, energy, power, pressure, data size, time and more (mathjs units), such as mi to km, degF to degC, GB to MiB, kWh to J.
Output
A JSON object containing the original value and unit ('from'), the target unit ('to'), the converted numeric result ('result'), and a human-readable string combining result and unit ('text'), e.g. {"from":"mi","to":"km","value":26.2,"result":42.1648128,"text":"42.1648128 km"}.
Example use cases
Marathon distance in metric
“I ran a marathon — that's 26.2 miles. How many kilometres is that?”
Temperature unit conversion
“My oven recipe says 375 degrees Fahrenheit — what is that in Celsius?”
Data storage unit conversion
“My cloud provider charges by GiB but my file is 50 GB — how many GiB is that exactly?”
Technical details
Endpoint
GEThttps://utils.kagurazaka.dev/v1/convert?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a quick, precise unit conversion across a broad range of physical quantities (length, mass, temperature, volume, speed, area, energy, power, pressure, data size, time) without setting up a local math library. It is ideal for agents handling user queries that mention specific numeric values and unit pairs, especially when accuracy beyond floating-point arithmetic is important. It covers mathjs-supported units, so it handles unusual units (e.g. AU, furlongs, BTU) that many simpler converters omit.
Side effects
- Unknown or misspelled unit strings cause an error response
- Incompatible unit types (e.g. converting mass to length) return an error
- Missing required query parameters (value, from, to) result in a 400-level error
- Very large or very small values may hit floating point limits
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"to": "km",
"from": "mi",
"text": "42.1648128 km",
"value": 26.2,
"result": 42.1648128
}
}Tags
x402
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