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2s.io Unit Converter
x402
2s.io Unit Converter is a paid API for AI agents from 2s.io, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Converts a numeric value between units of measure across mass, length, volume, area, and temperature dimensions using exact conversion factors.
Price / call$0.001
Success—
StatusUnknown
How this service works
Convert a value between units of measure: mass (g, kg, mg, lb, oz, t, st), length (m, km, cm, mm, in, ft, yd, mi), volume (l, ml, m3, gal, gal-imp, qt, pt, cup, floz, tbsp, tsp), area (m2, km2, ft2, acre, ha), and temperature (C, F, K). Units are matched case-insensitively with common aliases (kg/kilogram/kgs). Returns {value, from, to, dimension, result}. Exact factors — the ground-truth answer a CPG/ETL pipeline needs instead of an LLM approximating conversions. Cross-dimension conversions (kg→m) return 400.
Output
Returns a JSON object with fields: value (original numeric input), from (source unit as recognized), to (target unit as recognized), dimension (e.g. 'mass', 'length'), and result (the converted numeric value using exact conversion factors). Cross-dimension conversion attempts (e.g. kg to meters) return HTTP 400.
Example use cases
Example prompt
“Convert 150 pounds to kilograms for me — I need the exact answer, not an estimate.”
Technical details
Endpoint
GEThttps://2s.io/api/convert/unitWhen to prefer
Choose this endpoint when you need exact, deterministic unit conversion results rather than LLM-approximated values — especially in CPG, ETL pipelines, scientific calculations, or any context where precision matters. Prefer this over asking an LLM to convert units directly when accuracy is critical.
Side effects
- Cross-dimension conversion (e.g. kg to meters) returns HTTP 400 with an error message
- Unrecognized unit string returns an error — check aliases (kg/kilogram/kgs are all valid)
- Non-numeric value parameter causes a bad request error
- Missing required query parameter (value, from, or to) returns a 400-level error
Input
{
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"to": "kilograms",
"from": "pounds",
"value": 150
}
}
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Output
{
"data": {
"ok": true,
"items": [
{
"to": "kg",
"from": "lb",
"value": 150,
"reason": null,
"result": 68.03885550000001,
"dimension": "mass"
}
],
"total": 1,
"source": {
"url": "https://2s.io",
"license": "No upstream license — computed by 2s.io",
"provider": "2s.io unit converter"
}
},
"meta": {
"cost": {
"usd": 0.001,
"tier": 0
},
"caller": "x402",
"version": null,
"endpoint": "convert.unit",
"settlement": {
"txHash": "0xefa5b8f7792e85806d6f295db650a68e818fb35cb05204c9b3b63feb78af796d",
"network": "eip155:8453",
"success": true
}
}
}Tags
x402
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