magent

Deterministic published-formula arithmetic plus ICD-10-CM, RxNorm, and LOINC. Pay in USDC on Base via x402.

OtherLiveeip155:8453Exactvia cdp
AsasAxial-spaSpondyloarthritisClassificationEmergency
Calls · 30d
2→ 0%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 10 snapshots so far.
$13.75
Verified settled volume
2,750 settlements proven x402 by their on-chain EIP-3009 marker.
$0.0050
Listed price
As published in the catalog. Always read the live 402 before paying.
2
Calls · 30d
Upstream's own call count for this endpoint, not ours.
1
Unique payers · 30d
Last called 2026-08-31 13:29Z
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x836Be278f1739fB4308091cD1852F7971Bc19Ee2

The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.

Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Provider

The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.

Live 402 challenge

Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.

{
  "error": "PAYMENT-SIGNATURE header is required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2",
        "paymentFlow": "upfront",
        "resourceUrl": "https://api.magentlab.com/api/calc/asas_axial_spa",
        "assetTransferMethod": "eip3009"
      },
      "payTo": "0x836Be278f1739fB4308091cD1852F7971Bc19Ee2",
      "amount": "5000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 600
    },
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2",
        "withdrawDelay": 86400,
        "receiverAuthorizer": "0x3721824a31197dcDD2984cF43b92B6cc8A87c0Fb",
        "assetTransferMethod": "eip3009"
      },
      "payTo": "0x836Be278f1739fB4308091cD1852F7971Bc19Ee2",
      "amount": "5000",
      "scheme": "batch-settlement",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 600
    }
  ],
  "resource": {
    "url": "https://api.magentlab.com/api/calc/asas_axial_spa",
    "tags": [
      "asas",
      "axial-spa",
      "spondyloarthritis",
      "classification",
      "emergency"
    ],
    "mimeType": "application/json",
    "description": "ASAS 2009 axial SpA classification (Rudwaleit set 3a / fig 2). Required: chronic back pain ≥3 months and age at onset <45. Imaging arm: MRI or modified New York sacroiliitis plus ≥1 of 11 SpA features. Clinical arm: HLA-B27 plus ≥2 other features (HLA-B27 does not count toward those two). Not a diagnosis. Not peripheral ASAS 2011. Not modified New York AS-only. magent does not read films or assay HLA-B27.",
    "serviceName": "magent"
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "ibd": false,
            "hla_b27": false,
            "uveitis": false,
            "arthritis": false,
            "psoriasis": false,
            "dactylitis": false,
            "elevated_crp": false,
            "enthesitis_heel": false,
            "mri_sacroiliitis": true,
            "age_at_onset_years": 28,
            "family_history_spa": false,
            "nsaid_good_response": false,
            "inflammatory_back_pain": true,
            "radiographic_sacroiliitis": false,
            "chronic_back_pain_ge_3_months": true
          }
        },
        "output": {
          "type": "json",
          "example": {
            "formula": "asas_axial_spa",
            "citation": {
              "id": "rudwaleit-2009",
              "doi": "10.1136/ard.2009.108233",
              "pmid": "19297345",
              "title": "The development of Assessment of SpondyloArthritis international Society classification criteria for axial spondyloarthritis (part II): validation and final selection",
              "source": "Ann Rheum Dis. 2009;68(6):777-783",
              "authors": "Rudwaleit M, van der Heijde D, Landewé R, Listing J, Akkoc N, Brandt J, Braun J, Chou CT, Collantes-Estevez E, Dougados M, Huang F, Gu J, Khan MA, Kirazli Y, Maksymowych WP, Mielants H, Sørensen IJ, Ozgocmen S, Roussou E, Valle-Oñate R, Weber U, Wei J, Sieper J"
            },
            "classified": true,
            "disclaimer": "Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.",
            "imaging_arm": true,
            "clinical_arm": false,
            "spa_feature_count": 1,
            "formula_expression": "ASAS 2009 axial SpA classification (Rudwaleit set 3a / fig 2 + table 5): required chronic_back_pain_ge_3_months true and age_at_onset_years 1–44 (age at onset <45). sacroiliitis_on_imaging = mri_sacroiliitis or radiographic_sacroiliitis. spa_feature_count = count of 11 SpA features (inflammatory_back_pain, arthritis, enthesitis_heel, uveitis, dactylitis, psoriasis, ibd, nsaid_good_response, family_history_spa, hla_b27, elevated_crp). other_spa_feature_count = spa_feature_count minus 1 if hla_b27 else spa_feature_count. imaging_arm iff sacroiliitis_on_imaging and spa_feature_count ≥1. clinical_arm iff hla_b27 and other_spa_feature_count ≥2. classified iff imaging_arm or clinical_arm. Not a diagnosis. Not peripheral ASAS 2011. Not modified New York AS-only",
            "other_spa_feature_count": 1,
            "sacroiliitis_on_imaging": true
          }
        },
        "iconUrl": "https://api.magentlab.com/favicon.ico"
      },
      "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",
                  "HEAD",
                  "DELETE"
                ],
                "type": "string"
              },
              "headers": {
                "type": "object",
                "additionalProperties": {
                  "type": "string"
                }
              },
              "queryParams": {
                "type": "object",
                "required": [
                  "chronic_back_pain_ge_3_months",
                  "age_at_onset_years",
                  "mri_sacroiliitis",
                  "radiographic_sacroiliitis",
                  "inflammatory_back_pain",
                  "arthritis",
                  "enthesitis_heel",
                  "uveitis",
                  "dactylitis",
                  "psoriasis",
                  "ibd",
                  "nsaid_good_response",
                  "family_history_spa",
                  "hla_b27",
                  "elevated_crp"
                ],
                "properties": {
                  "ibd": {
                    "type": "boolean",
                    "description": "Past or present Crohn's disease or ulcerative colitis diagnosed by a physician, as assigned by the caller (Rudwaleit 2009). true or false. magent does not diagnose IBD."
                  },
                  "hla_b27": {
                    "type": "boolean",
                    "description": "HLA-B27 positive as assigned by the caller (Rudwaleit 2009). Obligatory for the clinical arm; does not count toward the two other SpA features. Counts toward spa_feature_count and the imaging arm. true or false. magent does not assay HLA-B27."
                  },
                  "uveitis": {
                    "type": "boolean",
                    "description": "Past or present uveitis confirmed by an ophthalmologist, as assigned by the caller (Rudwaleit 2009). true or false. magent does not examine the eye."
                  },
                  "arthritis": {
                    "type": "boolean",
                    "description": "Past or present synovitis diagnosed by a physician, as assigned by the caller (Rudwaleit 2009). true or false. magent does not examine joints."
                  },
                  "psoriasis": {
                    "type": "boolean",
                    "description": "Past or present psoriasis diagnosed by a physician, as assigned by the caller (Rudwaleit 2009). true or false. magent does not examine skin."
                  },
                  "dactylitis": {
                    "type": "boolean",
                    "description": "Past or present dactylitis diagnosed by a physician, as assigned by the caller (Rudwaleit 2009). true or false. magent does not examine digits."
                  },
                  "elevated_crp": {
                    "type": "boolean",
                    "description": "CRP above the upper limit of normal in the presence of back pain after exclusion of other causes, as assigned by the caller (Rudwaleit 2009). true or false. magent does not assay CRP."
                  },
                  "enthesitis_heel": {
                    "type": "boolean",
                    "description": "Past or present spontaneous pain or tenderness at the insertion of the Achilles tendon or plantar fascia at the calcaneus, as assigned by the caller (Rudwaleit 2009). Heel enthesitis only. true or false. magent does not examine entheses."
                  },
                  "mri_sacroiliitis": {
                    "type": "boolean",
                    "description": "Active (acute) inflammation on MRI highly suggestive of SpA-associated sacroiliitis, as assigned by the caller (Rudwaleit 2009). Combined with radiographic_sacroiliitis by OR for sacroiliitis_on_imaging. true or false. magent does not read MRI."
                  },
                  "age_at_onset_years": {
                    "type": "integer",
                    "description": "Age at onset of back pain in years, integer 1–44 (Rudwaleit 2009 entry: age at onset <45). 0 and ≥45 are invalid and are not classified. magent does not date the patient."
                  },
                  "family_history_spa": {
                    "type": "boolean",
                    "description": "Family history of SpA as assigned by the caller (Rudwaleit 2009): first-degree or second-degree relatives with ankylosing spondylitis, psoriasis, acute uveitis, reactive arthritis, or IBD. true or false. magent does not take a pedigree."
                  },
                  "nsaid_good_response": {
                    "type": "boolean",
                    "description": "Good response to NSAIDs as assigned by the caller (Rudwaleit 2009): 24–48 h after a full dose of NSAID the back pain is not present anymore or is much better. true or false. magent does not prescribe NSAIDs."
                  },
                  "inflammatory_back_pain": {
                    "type": "boolean",
                    "description": "Inflammatory back pain as assigned by the caller (Rudwaleit 2009 fig 2 / table 5). true or false. magent does not take a history or apply a nested IBP questionnaire."
                  },
                  "radiographic_sacroiliitis": {
                    "type": "boolean",
                    "description": "Definite radiographic sacroiliitis according to modified New York criteria (bilateral grade ≥2 or unilateral grade 3–4), as assigned by the caller (Rudwaleit 2009). true or false. magent does not read radiographs."
                  },
                  "chronic_back_pain_ge_3_months": {
                    "type": "boolean",
                    "description": "Must be true. Rudwaleit 2009 entry: chronic back pain ≥3 months. false is invalid and is not returned as classified=false. magent does not take a history."
                  }
                }
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object"
              }
            }
          }
        }
      }
    }
  },
  "x402Version": 2
}

Accepts

The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.

0.005USDC≈ $0.005 USD
on Base · exact scheme

Pay 0.005 USDC on Base to 0x836B…19Ee2. The signed payment is good for 10 minutes.

USD Coin contract
0x8335…02913
Payment window
10 minutes
As published
5000 smallest units
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2",
      "paymentFlow": "upfront",
      "resourceUrl": "https://api.magentlab.com/api/calc/asas_axial_spa",
      "assetTransferMethod": "eip3009"
    },
    "payTo": "0x836Be278f1739fB4308091cD1852F7971Bc19Ee2",
    "amount": "5000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 600
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "body": {
          "items": [
            {
              "ibd": false,
              "hla_b27": false,
              "uveitis": false,
              "arthritis": false,
              "psoriasis": false,
              "dactylitis": false,
              "elevated_crp": false,
              "enthesitis_heel": false,
              "mri_sacroiliitis": true,
              "age_at_onset_years": 28,
              "family_history_spa": false,
              "nsaid_good_response": false,
              "inflammatory_back_pain": true,
              "radiographic_sacroiliitis": false,
              "chronic_back_pain_ge_3_months": true
            },
            {
              "ibd": false,
              "hla_b27": false,
              "uveitis": false,
              "arthritis": false,
              "psoriasis": false,
              "dactylitis": false,
              "elevated_crp": false,
              "enthesitis_heel": false,
              "mri_sacroiliitis": true,
              "age_at_onset_years": 28,
              "family_history_spa": false,
              "nsaid_good_response": false,
              "inflammatory_back_pain": true,
              "radiographic_sacroiliitis": false,
              "chronic_back_pain_ge_3_months": true
            }
          ]
        },
        "type": "http",
        "method": "POST"
      },
      "output": {
        "type": "json",
        "example": {
          "path": "/api/calc/asas_axial_spa",
          "count": 2,
          "items": [
            {
              "formula": "asas_axial_spa",
              "citation": {
                "id": "rudwaleit-2009",
                "doi": "10.1136/ard.2009.108233",
                "pmid": "19297345",
                "title": "The development of Assessment of SpondyloArthritis international Society classification criteria for axial spondyloarthritis (part II): validation and final selection",
                "source": "Ann Rheum Dis. 2009;68(6):777-783",
                "authors": "Rudwaleit M, van der Heijde D, Landewé R, Listing J, Akkoc N, Brandt J, Braun J, Chou CT, Collantes-Estevez E, Dougados M, Huang F, Gu J, Khan MA, Kirazli Y, Maksymowych WP, Mielants H, Sørensen IJ, Ozgocmen S, Roussou E, Valle-Oñate R, Weber U, Wei J, Sieper J"
              },
              "classified": true,
              "disclaimer": "Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.",
              "imaging_arm": true,
              "clinical_arm": false,
              "spa_feature_count": 1,
              "formula_expression": "ASAS 2009 axial SpA classification (Rudwaleit set 3a / fig 2 + table 5): required chronic_back_pain_ge_3_months true and age_at_onset_years 1–44 (age at onset <45). sacroiliitis_on_imaging = mri_sacroiliitis or radiographic_sacroiliitis. spa_feature_count = count of 11 SpA features (inflammatory_back_pain, arthritis, enthesitis_heel, uveitis, dactylitis, psoriasis, ibd, nsaid_good_response, family_history_spa, hla_b27, elevated_crp). other_spa_feature_count = spa_feature_count minus 1 if hla_b27 else spa_feature_count. imaging_arm iff sacroiliitis_on_imaging and spa_feature_count ≥1. clinical_arm iff hla_b27 and other_spa_feature_count ≥2. classified iff imaging_arm or clinical_arm. Not a diagnosis. Not peripheral ASAS 2011. Not modified New York AS-only",
              "other_spa_feature_count": 1,
              "sacroiliitis_on_imaging": true
            },
            {
              "formula": "asas_axial_spa",
              "citation": {
                "id": "rudwaleit-2009",
                "doi": "10.1136/ard.2009.108233",
                "pmid": "19297345",
                "title": "The development of Assessment of SpondyloArthritis international Society classification criteria for axial spondyloarthritis (part II): validation and final selection",
                "source": "Ann Rheum Dis. 2009;68(6):777-783",
                "authors": "Rudwaleit M, van der Heijde D, Landewé R, Listing J, Akkoc N, Brandt J, Braun J, Chou CT, Collantes-Estevez E, Dougados M, Huang F, Gu J, Khan MA, Kirazli Y, Maksymowych WP, Mielants H, Sørensen IJ, Ozgocmen S, Roussou E, Valle-Oñate R, Weber U, Wei J, Sieper J"
              },
              "classified": true,
              "disclaimer": "Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.",
              "imaging_arm": true,
              "clinical_arm": false,
              "spa_feature_count": 1,
              "formula_expression": "ASAS 2009 axial SpA classification (Rudwaleit set 3a / fig 2 + table 5): required chronic_back_pain_ge_3_months true and age_at_onset_years 1–44 (age at onset <45). sacroiliitis_on_imaging = mri_sacroiliitis or radiographic_sacroiliitis. spa_feature_count = count of 11 SpA features (inflammatory_back_pain, arthritis, enthesitis_heel, uveitis, dactylitis, psoriasis, ibd, nsaid_good_response, family_history_spa, hla_b27, elevated_crp). other_spa_feature_count = spa_feature_count minus 1 if hla_b27 else spa_feature_count. imaging_arm iff sacroiliitis_on_imaging and spa_feature_count ≥1. clinical_arm iff hla_b27 and other_spa_feature_count ≥2. classified iff imaging_arm or clinical_arm. Not a diagnosis. Not peripheral ASAS 2011. Not modified New York AS-only",
              "other_spa_feature_count": 1,
              "sacroiliitis_on_imaging": true
            }
          ]
        }
      },
      "iconUrl": "https://api.magentlab.com/favicon.ico"
    },
    "schema": {
      "type": "object",
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "required": [
        "input"
      ],
      "properties": {
        "input": {
          "type": "object",
          "required": [
            "type",
            "method"
          ],
          "properties": {
            "body": {
              "type": "object",
              "required": [
                "items"
              ],
              "properties": {
                "items": {
                  "type": "array",
                  "items": {
                    "type": "object",
                    "required": [
                      "chronic_back_pain_ge_3_months",
                      "age_at_onset_years",
                      "mri_sacroiliitis",
                      "radiographic_sacroiliitis",
                      "inflammatory_back_pain",
                      "arthritis",
                      "enthesitis_heel",
                      "uveitis",
                      "dactylitis",
                      "psoriasis",
                      "ibd",
                      "nsaid_good_response",
                      "family_history_spa",
                      "hla_b27",
                      "elevated_crp"
                    ],
                    "properties": {
                      "ibd": {
                        "type": "boolean",
                        "description": "Past or present Crohn's disease or ulcerative colitis diagnosed by a physician, as assigned by the caller (Rudwaleit 2009). true or false. magent does not diagnose IBD."
                      },
                      "hla_b27": {
                        "type": "boolean",
                        "description": "HLA-B27 positive as assigned by the caller (Rudwaleit 2009). Obligatory for the clinical arm; does not count toward the two other SpA features. Counts toward spa_feature_count and the imaging arm. true or false. magent does not assay HLA-B27."
                      },
                      "uveitis": {
                        "type": "boolean",
                        "description": "Past or present uveitis confirmed by an ophthalmologist, as assigned by the caller (Rudwaleit 2009). true or false. magent does not examine the eye."
                      },
                      "arthritis": {
                        "type": "boolean",
                        "description": "Past or present synovitis diagnosed by a physician, as assigned by the caller (Rudwaleit 2009). true or false. magent does not examine joints."
                      },
                      "psoriasis": {
                        "type": "boolean",
                        "description": "Past or present psoriasis diagnosed by a physician, as assigned by the caller (Rudwaleit 2009). true or false. magent does not examine skin."
                      },
                      "dactylitis": {
                        "type": "boolean",
                        "description": "Past or present dactylitis diagnosed by a physician, as assigned by the caller (Rudwaleit 2009). true or false. magent does not examine digits."
                      },
                      "elevated_crp": {
                        "type": "boolean",
                        "description": "CRP above the upper limit of normal in the presence of back pain after exclusion of other causes, as assigned by the caller (Rudwaleit 2009). true or false. magent does not assay CRP."
                      },
                      "enthesitis_heel": {
                        "type": "boolean",
                        "description": "Past or present spontaneous pain or tenderness at the insertion of the Achilles tendon or plantar fascia at the calcaneus, as assigned by the caller (Rudwaleit 2009). Heel enthesitis only. true or false. magent does not examine entheses."
                      },
                      "mri_sacroiliitis": {
                        "type": "boolean",
                        "description": "Active (acute) inflammation on MRI highly suggestive of SpA-associated sacroiliitis, as assigned by the caller (Rudwaleit 2009). Combined with radiographic_sacroiliitis by OR for sacroiliitis_on_imaging. true or false. magent does not read MRI."
                      },
                      "age_at_onset_years": {
                        "type": "integer",
                        "description": "Age at onset of back pain in years, integer 1–44 (Rudwaleit 2009 entry: age at onset <45). 0 and ≥45 are invalid and are not classified. magent does not date the patient."
                      },
                      "family_history_spa": {
                        "type": "boolean",
                        "description": "Family history of SpA as assigned by the caller (Rudwaleit 2009): first-degree or second-degree relatives with ankylosing spondylitis, psoriasis, acute uveitis, reactive arthritis, or IBD. true or false. magent does not take a pedigree."
                      },
                      "nsaid_good_response": {
                        "type": "boolean",
                        "description": "Good response to NSAIDs as assigned by the caller (Rudwaleit 2009): 24–48 h after a full dose of NSAID the back pain is not present anymore or is much better. true or false. magent does not prescribe NSAIDs."
                      },
                      "inflammatory_back_pain": {
                        "type": "boolean",
                        "description": "Inflammatory back pain as assigned by the caller (Rudwaleit 2009 fig 2 / table 5). true or false. magent does not take a history or apply a nested IBP questionnaire."
                      },
                      "radiographic_sacroiliitis": {
                        "type": "boolean",
                        "description": "Definite radiographic sacroiliitis according to modified New York criteria (bilateral grade ≥2 or unilateral grade 3–4), as assigned by the caller (Rudwaleit 2009). true or false. magent does not read radiographs."
                      },
                      "chronic_back_pain_ge_3_months": {
                        "type": "boolean",
                        "description": "Must be true. Rudwaleit 2009 entry: chronic back pain ≥3 months. false is invalid and is not returned as classified=false. magent does not take a history."
                      }
                    }
                  },
                  "maxItems": 25,
                  "minItems": 1
                }
              },
              "additionalProperties": false
            },
            "type": {
              "type": "string",
              "const": "http"
            },
            "method": {
              "type": "string",
              "const": "POST"
            },
            "headers": {
              "type": "object",
              "additionalProperties": {
                "type": "string"
              }
            }
          },
          "additionalProperties": false
        },
        "output": {
          "type": "object",
          "required": [
            "type"
          ],
          "properties": {
            "type": {
              "type": "string"
            },
            "example": {
              "type": "object"
            }
          }
        }
      }
    }
  }
}

Provenance

Seen in the source catalog
2026-08-31 13:29Z
Last indexed by Roundhouse
2026-09-07 06:20Z
Last enriched (probe, favicon, geo)
2026-09-22 11:15Z
x402 version
2
Max timeout
600s
Liveness probe
HTTP 402
Report

Hand this page to an agent

Copy the prompt and paste it into Claude, an MCP client or your own agent — it will vet this service and call it over the free read API. No key, no account.

GET api.roundhouseai.io/v0/endpoints

This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 10 snapshots so far. Verified volume counts only settlements with an on-chain EIP-3009 marker.

Open skill.md
Show the prompt
Using Roundhouse, look up the x402 service magent and tell me whether it is
worth paying: what a call costs, whether the endpoint answered when last probed, and what
its payment record actually shows.

curl -s 'https://api.roundhouseai.io/v0/endpoints?q=magent'
curl -s 'https://api.roundhouseai.io/v0/merchants/<the payTo wallet returned above>'

Then call it: read the price from the live 402 at https://api.magentlab.com/api/calc/asas_axial_spa, never from
a cached figure, and pay with an x402 client.

The /v0 API needs an API key (`authorization: Bearer rh_live_…`) on everything except
/v0/unified* and /v0/endpoints. Mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402,
or use an organization key from https://roundhouseai.io/dashboard/team.

If you do not have Roundhouse tools or skills installed, read
https://roundhouseai.io/skill.md first — it is the whole procedure.