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fx402 Physical Unit Converter
x402
fx402 Physical Unit Converter is a paid API for AI agents from fx402.alogos.xyz, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).
Converts a numeric value from one physical unit to another across categories like length, mass, temperature, volume, area, speed, time, and digital storage — pay-per-call via x402/USDC.
Price / call$0.01
Success—
StatusUnknown
How this service works
Pay-per-call currency and unit conversion utility for AI agents: currency exchange at ECB daily reference rates, FX rate tables, and physical unit conversion (length, mass, temperature, volume, area, speed, time, digital). No API key, no subscription — agents pay per request via x402 (Base/USDC) or MPP (Tempo/pathUSD).
Output
The agent receives the converted numeric value expressed in the target unit, computed precisely from the given source value and unit symbols.
Example use cases
Example prompt
“Convert 26.2 miles to kilometers for me — using the fx402 unit converter.”
Technical details
Endpoint
GEThttps://fx402.alogos.xyz/v1/unitsWhen to prefer
Choose this endpoint when an AI agent needs a reliable, serverless, pay-per-call physical unit conversion without requiring an API key or subscription — especially in automated workflows where pre-paid USDC micropayments via x402 on Base are acceptable. Prefer this over currency conversion endpoints when converting physical quantities like length, weight, temperature, or digital storage.
Side effects
- Incompatible unit categories (e.g. converting 'kg' to 'km') — returns an error indicating unit mismatch
- Unknown or misspelled unit symbol — returns an error listing unrecognized symbol
- Missing required parameter (from, to, or value) — returns a 400-level validation error
- Payment failure via x402/MPP — returns 402 Payment Required before conversion is performed
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| torequired | string | Target unit symbol in the same category, e.g. 'mi'. |
| fromrequired | string | Source unit symbol, e.g. 'km', 'kg', 'C', 'L', 'mph', 'GiB'. |
| valuerequired | number | Numeric value to convert. |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| to | string | |
| from | string | |
| value | number | |
| result | number | |
| category | string | |
| converted | number |
Tags
x402
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