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Coprocesseur Déterministe – Conversion d'Unités
x402
Coprocesseur Déterministe – Conversion d'Unités is a paid API for AI agents from x402.laboiteatubes.media, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-13).
Converts a numeric value from one physical unit to another (length, mass, volume, temperature) and returns the result with its formula, exact conversion factor, and a SHA-256 proof fingerprint.
Price / call$0.001
Success—
StatusUnknown
How this service works
Trois calculs déterministes destinés aux agents IA : amortissement de prêt, distance orthodromique, conversion d'unités. Chaque réponse porte son résultat, la formule appliquée, ses limites, et une empreinte SHA-256 recalculable — la chaîne exacte qui a été hachée est renvoyée avec, et `POST /verifier` permet de la contrôler gratuitement. Un même appel rend toujours la même empreinte : l'horodatage est exclu du hachage. Le paiement suit le protocole x402 (version 2), en USDC sur Base.
Output
A JSON object containing: the converted numeric value rounded to 12 significant figures, the source and target units, the SI base-unit intermediate value, the multiplicative conversion factor applied, a human-readable formula expression and its reference standard, a SHA-256 fingerprint (with the exact canonical JSON string that was hashed, covering operation, formula version, inputs, and result), service metadata (version, timestamp), and notes on precision and exact-definition factors.
Example use cases
Engineering unit conversion with audit trail
“Convert 250 millimeters to inches and give me the SHA-256 proof fingerprint so our audit log can verify the calculation was done correctly.”
Temperature conversion for recipe scaling
“I need to convert 180 degrees Celsius to Fahrenheit — can you do that and show me the formula that was used?”
Weight conversion for shipping calculation
“How many pounds is 3.5 kilograms? I need the exact conversion factor too, not an approximation.”
Technical details
Endpoint
GEThttps://x402.laboiteatubes.media/conversion?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a deterministic, auditable unit conversion with a cryptographic proof that the computation was performed correctly and consistently — ideal for AI agents, automated pipelines, or compliance workflows where reproducibility and verifiability matter. Prefer it over generic conversion libraries when you need a third-party signed fingerprint or an exact-definition factor (e.g. 1959 international yard/pound agreement, BIPM nautical mile).
Side effects
- Missing required query parameters (valeur, de, vers) returns an error
- Incompatible unit families (e.g. converting km to kg) returns a validation error
- Unsupported unit enum value returns an error
- Payment failure via x402 protocol blocks the request
- Network timeout or service unavailability
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"notes": [
"Résultat arrondi à 12 chiffres significatifs.",
"Les facteurs utilisés sont des valeurs de définition exactes, pas des approximations."
],
"preuve": {
"note": "L'horodatage `calcule_le` est volontairement exclu de l'empreinte.",
"empreinte": "110e8bee04129dd94951c2ff11d7a73c156675522ee3bc5b266f18e585eceacf",
"algorithme": "SHA-256",
"chaine_hachee": "{\"entrees\":{\"de\":\"km\",\"famille\":\"longueur\",\"valeur\":100,\"vers\":\"mi\"},\"formule_expression\":\"v' = v × (k_source / k_cible)\",\"operation\":\"conversion\",\"resultat\":{\"facteur_applique\":0.621371192237,\"unite\":\"mi\",\"unite_de_base\":\"m\",\"valeur_convertie\":62.1371192237,\"valeur_en_unite_de_base\":100000},\"version_formule\":\"conversion-unites@1.0.0\"}",
"champs_couverts": [
"operation",
"version_formule",
"entrees",
"resultat",
"formule_expression"
],
"canonicalisation": "JSON à clés triées récursivement, sans espace, encodé en UTF-8"
},
"entrees": {
"de": "km",
"vers": "mi",
"valeur": 100,
"famille": "longueur"
},
"formule": {
"reference": "Facteurs impériaux exacts de l'accord international sur le yard et la livre (1959) ; mille marin = 1852 m (BIPM/OHI).",
"variables": {
"v": "valeur d'entrée",
"v'": "valeur convertie",
"k_cible": "facteur de « mi » vers m = 1609.344",
"k_source": "facteur de « km » vers m = 1000"
},
"expression": "v' = v × (k_source / k_cible)",
"description": "Conversion multiplicative via l'unité SI de base (m)."
},
"service": "coprocesseur-deterministe",
"resultat": {
"unite": "mi",
"unite_de_base": "m",
"facteur_applique": 0.621371192237,
"valeur_convertie": 62.1371192237,
"valeur_en_unite_de_base": 100000
},
"operation": "conversion",
"calcule_le": "2026-08-16T08:29:39.319Z",
"version_formule": "conversion-unites@1.0.0",
"version_service": "1.0.0"
}
}Tags
x402
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