●

Coprocesseur déterministe

Compute PAYMENT-READY

payment-ready until 2026-08-24

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.

listed 2026-08-17 · no on-chain settlement recorded yet

BASE URL https://x402.laboiteatubes.media │ WEBSITE https://x402.laboiteatubes.media │ ENDPOINTS 3 │ NETWORK Base │ ASSET USDC │ MEMBER SINCE 2026-08-17 │ MONITORED SINCE 2026-08-17

ASSESSMENT

updated 5h ago

Evidence-backed signals, not a single score. Click any chip for the proof. Measured values stay read-only; unknown is honest.

reliability 100%

uptime 24h: -
uptime 7d: -
uptime 30d: -
uptime 90d: -
response p95: 25ms
avg response: 25ms
total checks: 1

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.

jump to compliance checklist

price $0.001 to $0.003 (p25 in Compute)

price (min): $0.001
price (max): $0.003
category percentile (min): p25 in Compute
category percentile (max): p25 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: 2d
registrar: OVH SAS
hosting: custom
domain created: 2026-08-15

Identity facts, not a risk score.

traction $0.00 30d · 0 buyers

volume 30d: $0.00
buyers 30d: 0
settlements 30d: 0
measured since: --- (start of our harvest window)
last settlement: ---
top buyer share: -
trend 7d vs 30d: -
networks: eip155:8453
volume all-time: $0
settlements all-time: 0
median settlement 30d: -
max settlement 30d: -
settled via: -

Conservative undercount: only USDC settlements via facilitators we measure are counted. A measured floor, not an estimate.

Top buyer share is a concentration signal, not part of the ranking score.

WHAT IT DOES

ai-derived

No AI synthesis has been produced for this service yet.

ENDPOINTS

Service endpoints with HTTP method, path, description, pricing, and network
METHOD	PATH	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

3 endpoints

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.

// request

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 7d selector; 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.

UPTIME

7d UPTIME 100%

RESPONSE TIME

AVG RESP 72ms

PRICE (captured 402, USD)

Median across 3 endpoints. Use the selector to isolate one.

SUB-SCORES (uptime + x402 compliance)

checklist grew 11->14 on 2026-07-28; a step here is a metric change, not a regression

VOLUME (on-chain settlement, USD)

DISTINCT BUYERS

COMPLIANCE

14/14 checks pass · grade A

last 402 captured 2026-08-17 · last up 2026-08-17

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

TIME STATUS RESP CAUSE

19:59:00 UTC ● SLOW 158ms

19:43:00 UTC ● OK 22ms

19:27:00 UTC ● OK 46ms

19:11:00 UTC ● OK 31ms

18:55:00 UTC ● OK 23ms

18:39:00 UTC ● OK 99ms

18:23:00 UTC ● SLOW 179ms

18:07:00 UTC ● OK 24ms

17:51:00 UTC ● OK 65ms

17:35:00 UTC ● OK 19ms

17:19:00 UTC ● OK 27ms

17:03:00 UTC ● OK 91ms

16:47:01 UTC ● SLOW 293ms

16:31:00 UTC ● OK 17ms

16:15:00 UTC ● OK 70ms

15:59:00 UTC ● SLOW 119ms

15:43:00 UTC ● OK 37ms

15:27:00 UTC ● OK 19ms

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status

Coprocesseur déterministe uptime on x402-list — live uptime

// HTML

<a href="https://x402-list.com/services/coprocesseur-d-terministe?utm_source=badge&utm_medium=referral&utm_campaign=embed">
  <img src="https://x402-list.com/badge/coprocesseur-d-terministe.svg" alt="Coprocesseur déterministe listed on x402-list" height="28">
</a>

// Markdown

[![Coprocesseur déterministe on x402-list](https://x402-list.com/badge/coprocesseur-d-terministe.svg)](https://x402-list.com/services/coprocesseur-d-terministe?utm_source=badge&utm_medium=referral&utm_campaign=embed)

// HTML · live uptime variant

<a href="https://x402-list.com/services/coprocesseur-d-terministe?utm_source=badge&utm_medium=referral&utm_campaign=embed">
  <img src="https://x402-list.com/badge/coprocesseur-d-terministe.svg?data=uptime" alt="Coprocesseur déterministe uptime on x402-list" height="28">
</a>

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