payment-ready until 2026-10-06
Calculs déterministes vérifiables pour agents IA : tableaux d'amortissement de prêt, distances géodésiques, conversions d'unités. Chaque réponse inclut une preuve SHA-256 vérifiable indépendamment par le client, sans avoir à faire confiance au serveur.
Pay from $0.001 to $0.003 per request in USDC on Base, settled onchain via the x402 protocol, no signup, no API key needed.
measured since 2026-08-16 (start of our harvest window) · $0.01 all-time · settled via coinbase
VERDICT
ranking generation 3solid 87/100 #3 of 16 in Compute by measured score
What the score read on this service: status online, 100% uptime 30d, 643ms response p95, x402 compliance 14 of 14, $0.001 price against the category, on-chain traction measured. Each of those is measured, and each is published in full below.
The score comes from our own monitoring, never from reviews, operator claims, or a language model: reliability, x402 compliance, price against the category, a deterministic risk flag, and a small on-chain traction term, weighted by ranking generation 3. It is not placement anyone can buy: the paid verify tier is reported beside it and is not one of its inputs. Every component below stays published and read-only.
It is a score inside Compute, and only there: price and speed are scored against the whole category field, every listing in it that carries no danger flag, the scored service included, which here means 16 listings, this one among them. That set is wider than the 16 the position above is counted against, because a listing we have measured too little of to rank still sits in the field the price and the speed are normalized over. The same service in a different field would read differently. The same engine answers GET /api/v1/best, and asked for a different pool (the whole directory, or another filter) it returns a different number for this service under this same ranking generation. Neither is more correct: they answer different questions, and the methodology states which is which.
Bands on the 0 to 100 measured score: strong at 93 and above, solid from 75, mixed from 55, weak below 55. Price and speed are scored against the whole category field, every listing in it that carries no danger flag, the scored service included, so the score places a service in its own field.
ALTERNATIVES IN COMPUTE
Other Compute services in this directory, ordered by the same measured score. The figures are ours: 30-day uptime from our own probes, 30-day settlement volume read on-chain (a conservative undercount, and null where we cannot measure it, never a zero).
| SERVICE | BAND | SCORE | UPTIME 30D | VOL 30D |
|---|---|---|---|---|
| QuickNode | solid | 89 | 100% | $0 |
| Cloud World Model | solid | 88 | 99.9% | $0.92 |
| agent-exec | solid | 86 | 99.9% | $0 |
| Shehriyars API | solid | 86 | 100% | $0.002 |
| Relaystation | solid | 85 | 100% | $7.64 |
ASSESSMENT
updated 4h agoThe parts the verdict above is computed from, each with its proof. Click any chip. Measured values stay read-only; unknown is honest, and an unknown is never counted as a zero.
reliability 100%
- uptime · latest daily rollup
- 100%
- uptime 7d
- 100%
- uptime 30d
- 100%
- uptime 90d
- 99.9%
- response p95
- 643ms
- avg response
- 357ms
- total checks
- 2,777
Measured on the unpaid 402 handshake, not the paid call. A service can 402 correctly and still fail after payment.
compliance A (14/14)
14 of 14 x402 conformance checks pass. Full checklist below.
price $0.001 to $0.003 (p22 in Compute)
- price (min)
- $0.001
- price (max)
- $0.003
- category percentile (min)
- p22 in Compute
- category percentile (max)
- p19 in Compute
- endpoints / prices
- 3 / 2
- model
- tiered
- stability
- 100%
risk clean
No deterministic risk flag. Risk fires only on an exact blocklist match, or a reserved-brand name with a mismatched verified payTo. Never from low uptime, a high price, or a model guess.
- domain age
- 38d
- registrar
- OVH SAS
- hosting
- custom
- domain created
- 2026-08-15
Identity facts, not a risk score.
traction $0.002 30d · 2 buyers
- volume 30d
- $0.002
- buyers 30d
- 2
- settlements 30d
- 2
- measured since
- 2026-08-16 (start of our harvest window)
- last settlement
- 2026-09-25
- top buyer share
- 50% of 30d volume (address, not entity)
- trend 7d vs 30d
- 2.14x the 30d daily rate
- networks
- eip155:8453
- volume all-time
- $0.01
- settlements all-time
- 8
- median settlement 30d
- $0.001
- max settlement 30d
- $0.001
- settled via
- coinbase ($0.002, 2 tx)
Conservative undercount: only USDC settlements via facilitators we measure are counted. A measured floor, not an estimate.
Top buyer share is part of the ranking score: a higher share lowers the traction part of the score, by up to half when one address holds all 30d volume.
WHAT IT DOES
ai-derivedNo AI synthesis has been produced for this service yet.
ENDPOINTS
| METHOD | PATH | DESCRIPTION | PRICE | NETWORK | ASSET | 402 CHANNEL |
|---|---|---|---|---|---|---|
| GET | /amortissement | $0.003 | Base | USDC | header | |
| GET | /conversion | $0.001 | Base | USDC | header | |
| GET | /distance | $0.001 | Base | USDC | header |
REQUEST / RESPONSE EXAMPLE
An unpaid request to GET /amortissement returns HTTP 402 with the payment terms. Settle onchain via your facilitator, then retry with the X-Payment header.
curl -i 'https://x402.laboiteatubes.media/amortissement'
// 402 response (captured by monitor) · 3 payloads · click to expand
[
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0xB136c660f69D2f6Dc668AC83a2fF77031b82e9D7",
"amount": "3000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 60
}
],
"resource": {
"url": "https://x402.laboiteatubes.media/amortissement",
"tags": [
"finance",
"calcul",
"deterministe",
"pret",
"amortissement"
],
"mimeType": "application/json",
"description": "Tableau d'amortissement d'un prêt à mensualités constantes, calculé en centimes entiers, avec formule et empreinte SHA-256 vérifiable.",
"serviceName": "coprocesseur-deterministe"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"montant": "200000",
"duree_mois": "240",
"taux_annuel": "3.5"
}
},
"output": {
"type": "json",
"example": {
"notes": [
"Calcul mené en centimes entiers, arrondi au centime le plus proche à chaque échéance.",
"La dernière échéance est ajustée pour solder exactement le capital.",
"Taux nominal proportionnel (t/12). Ce n'est ni un TAEG ni un taux actuariel : assurance, frais de dossier et garanties ne sont pas inclus."
],
"preuve": {
"note": "L'horodatage `calcule_le` est volontairement exclu de l'empreinte.",
"empreinte": "14be0ebc8d16f4fc4a5cc3884f0a624365a7d468612e9098b0fbc66ae799c673",
"algorithme": "SHA-256",
"chaine_hachee": "{\"entrees\":{\"devise\":\"EUR\",\"duree_mois\":2,\"montant\":200000,\"taux_annuel\":3.5},\"formule_expression\":\"M = C × i / (1 − (1 + i)^(−n)), avec i = t/1200\",\"operation\":\"amortissement\",\"resultat\":{\"cout_total_credit\":875.42,\"derniere_echeance\":100437.71,\"echeancier\":[{\"capital_rembourse\":99854.38,\"capital_restant_du\":100145.62,\"echeance\":100437.71,\"interets\":583.33,\"mois\":1},{\"capital_rembourse\":100145.62,\"capital_restant_du\":0,\"echeance\":100437.71,\"interets\":292.09,\"mois\":2}],\"mensualite\":100437.71,\"nombre_echeances\":2,\"taux_mensuel\":0.0029166667,\"total_rembourse\":200875.42},\"version_formule\":\"[email protected]\"}",
"champs_couverts": [
"operation",
"version_formule",
"entrees",
"resultat",
"formule_expression"
],
"canonicalisation": "JSON à clés triées récursivement, sans espace, encodé en UTF-8"
},
"entrees": {
"devise": "EUR",
"montant": 200000,
"duree_mois": 2,
"taux_annuel": 3.5
},
"formule": {
"reference": "Formule standard de l'annuité constante (valeur actuelle d'une suite d'annuités).",
"variables": {
"C": "capital emprunté",
"M": "mensualité constante",
"i": "taux périodique mensuel",
"n": "nombre de mensualités",
"t": "taux annuel nominal en %"
},
"expression": "M = C × i / (1 − (1 + i)^(−n)), avec i = t/1200",
"description": "Prêt à mensualités constantes (amortissement dit « français »). Les intérêts de chaque échéance sont calculés sur le capital restant dû ; le solde de la mensualité amortit le capital."
},
"service": "coprocesseur-deterministe",
"resultat": {
"echeancier": [
{
"mois": 1,
"echeance": 100437.71,
"interets": 583.33,
"capital_rembourse": 99854.38,
"capital_restant_du": 100145.62
},
{
"mois": 2,
"echeance": 100437.71,
"interets": 292.09,
"capital_rembourse": 100145.62,
"capital_restant_du": 0
}
],
"mensualite": 100437.71,
"taux_mensuel": 0.0029166667,
"total_rembourse": 200875.42,
"nombre_echeances": 2,
"cout_total_credit": 875.42,
"derniere_echeance": 100437.71
},
"operation": "amortissement",
"calcule_le": "2026-08-16T08:29:39.319Z",
"version_formule": "[email protected]",
"version_service": "1.0.0"
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method"
],
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [
"montant",
"taux_annuel",
"duree_mois"
],
"properties": {
"montant": {
"type": "number",
"maximum": 1000000000,
"minimum": 0.01
},
"duree_mois": {
"type": "integer",
"maximum": 600,
"minimum": 1
},
"taux_annuel": {
"type": "number",
"maximum": 100,
"minimum": 0
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
},
"x402Version": 2
},
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0xB136c660f69D2f6Dc668AC83a2fF77031b82e9D7",
"amount": "1000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 60
}
],
"resource": {
"url": "https://x402.laboiteatubes.media/distance",
"tags": [
"geo",
"calcul",
"deterministe",
"haversine",
"distance"
],
"mimeType": "application/json",
"description": "Distance orthodromique entre deux points GPS (formule de haversine) et cap initial, avec formule et empreinte SHA-256 vérifiable.",
"serviceName": "coprocesseur-deterministe"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"lat1": "48.8566",
"lat2": "45.764",
"lon1": "2.3522",
"lon2": "4.8357"
}
},
"output": {
"type": "json",
"example": {
"notes": [
"Modèle SPHÉRIQUE : l'écart avec un calcul ellipsoïdal (Vincenty / WGS84) atteint typiquement 0,3 à 0,5 %. Pour du géodésique de précision, ce service n'est pas le bon outil.",
"L'altitude n'est pas prise en compte : c'est une distance au niveau de la sphère de référence.",
"L'azimut renvoyé est le cap INITIAL ; il varie le long d'un grand cercle."
],
"preuve": {
"note": "L'horodatage `calcule_le` est volontairement exclu de l'empreinte.",
"empreinte": "7052442400f9fd1c636e78e5d88ab34ccb7cf9ada9406209a860bf33096aa8e2",
"algorithme": "SHA-256",
"chaine_hachee": "{\"entrees\":{\"lat1\":48.8566,\"lat2\":45.764,\"lon1\":2.3522,\"lon2\":4.8357,\"rayon_terre_m\":6371008.8},\"formule_expression\":\"a = sin²(Δφ/2) + cos φ₁ · cos φ₂ · sin²(Δλ/2) ; c = 2·atan2(√a, √(1−a)) ; d = R·c\",\"operation\":\"distance\",\"resultat\":{\"angle_central_rad\":0.061450154085,\"azimut_initial_deg\":150.5125,\"distance_km\":391.499472,\"distance_m\":391499.472,\"distance_mille_nautique\":211.392804},\"version_formule\":\"[email protected]\"}",
"champs_couverts": [
"operation",
"version_formule",
"entrees",
"resultat",
"formule_expression"
],
"canonicalisation": "JSON à clés triées récursivement, sans espace, encodé en UTF-8"
},
"entrees": {
"lat1": 48.8566,
"lat2": 45.764,
"lon1": 2.3522,
"lon2": 4.8357,
"rayon_terre_m": 6371008.8
},
"formule": {
"reference": "R. W. Sinnott, « Virtues of the Haversine », Sky & Telescope, 1984.",
"variables": {
"R": "rayon terrestre moyen, 6371008.8 m",
"d": "distance orthodromique en mètres",
"Δφ, Δλ": "différences de latitude et de longitude, en radians",
"φ₁, φ₂": "latitudes des deux points, en radians"
},
"expression": "a = sin²(Δφ/2) + cos φ₁ · cos φ₂ · sin²(Δλ/2) ; c = 2·atan2(√a, √(1−a)) ; d = R·c",
"description": "Formule de haversine : distance sur un modèle sphérique de la Terre, le long du grand cercle."
},
"service": "coprocesseur-deterministe",
"resultat": {
"distance_m": 391499.472,
"distance_km": 391.499472,
"angle_central_rad": 0.061450154085,
"azimut_initial_deg": 150.5125,
"distance_mille_nautique": 211.392804
},
"operation": "distance",
"calcule_le": "2026-08-16T08:29:39.318Z",
"version_formule": "[email protected]",
"version_service": "1.0.0"
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method"
],
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [
"lat1",
"lon1",
"lat2",
"lon2"
],
"properties": {
"lat1": {
"type": "number",
"maximum": 90,
"minimum": -90
},
"lat2": {
"type": "number",
"maximum": 90,
"minimum": -90
},
"lon1": {
"type": "number",
"maximum": 180,
"minimum": -180
},
"lon2": {
"type": "number",
"maximum": 180,
"minimum": -180
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
},
"x402Version": 2
},
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0xB136c660f69D2f6Dc668AC83a2fF77031b82e9D7",
"amount": "1000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 60
}
],
"resource": {
"url": "https://x402.laboiteatubes.media/conversion",
"tags": [
"unites",
"calcul",
"deterministe",
"conversion"
],
"mimeType": "application/json",
"description": "Conversion d'unités de longueur, masse, volume et température, sur facteurs de définition exacts, avec formule et empreinte SHA-256 vérifiable.",
"serviceName": "coprocesseur-deterministe"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"de": "km",
"vers": "mi",
"valeur": "100"
}
},
"output": {
"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\":\"[email protected]\"}",
"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": "[email protected]",
"version_service": "1.0.0"
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method"
],
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [
"valeur",
"de",
"vers"
],
"properties": {
"de": {
"enum": [
"km",
"m",
"dm",
"cm",
"mm",
"um",
"nm",
"mi",
"yd",
"ft",
"in",
"nmi",
"t",
"kg",
"g",
"mg",
"ug",
"lb",
"oz",
"st",
"m3",
"L",
"dL",
"cL",
"mL",
"gal_us",
"qt_us",
"pt_us",
"floz_us",
"gal_uk",
"K",
"C",
"F"
],
"type": "string"
},
"vers": {
"enum": [
"km",
"m",
"dm",
"cm",
"mm",
"um",
"nm",
"mi",
"yd",
"ft",
"in",
"nmi",
"t",
"kg",
"g",
"mg",
"ug",
"lb",
"oz",
"st",
"m3",
"L",
"dL",
"cL",
"mL",
"gal_us",
"qt_us",
"pt_us",
"floz_us",
"gal_uk",
"K",
"C",
"F"
],
"type": "string"
},
"valeur": {
"type": "number"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
},
"x402Version": 2
}
] OVER TIME
All charts use the today (UTC) selector: uptime, response time, volume and buyers show the current UTC day so far, price and sub-scores the last 24 hours; each series spans only the dates it has data for. Every series is also served as JSON at /api/v1/services/coprocesseur-d-terministe/price, /scores, /volume and /buyers. On-chain volume and distinct buyers are measured over the service's settlement address and are a conservative undercount (only settlements that reach a measured facilitator are counted). The on-chain series roll up hourly, so the latest day can be up to about an hour behind; distinct buyers are counted per payout address, so a service that settles to more than one address is an upper bound.
Median across 3 endpoints. Use the selector to isolate one.
checklist grew 11->14 on 2026-07-28; a step here is a metric change, not a regression
Measured site and economics pillars from the assessment history, so the latest value shown elsewhere on this page reads as a point on a trend rather than a permanent state.
COMPLIANCE
14/14 checks pass · grade Alast 402 captured 2026-08-17 · last up 2026-09-29
- 402 payload captured
- accepts[] array present
- payTo address recoverable
- payTo at accepts[0].payTo (conformant shape)
- payTo is a valid on-chain address
- atomic price declared
- atomic price in a sane range
- asset (token) address declared
- network resolves to CAIP-2
- payment scheme declared
- served over HTTPS
- declares the current x402 version (2)
- EIP-712 domain parameters present on every EVM entry
- x402 v2 envelope delivered in the payment-required header
SITE PILLARS
- homepage reachable
- openapi doc
- pricing page
- llms.txt
- robots.txt
- terms page
recent checks (18) live · click to expand
EMBED THIS BADGE
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