Roundhouse

magent

Levy 2006 Seattle Heart Failure Model 1-, 2-, and 3-year survival from Table 2 multivariate HRs. Score = sum of ln(HR)*x; S(t)=exp(-0.0405*t)**exp(score). Age, sex, NYHA, EF, ischemic etiology, SBP, furosemide-eq diuretic, labs, and already-on ACEI, beta-blocker, ARB, K-sparing diuretic, statin, BiV, ICD, or BiV-ICD. Caller assigns class, etiology, and therapy. magent does not measure labs or blood pressure. Not a diagnosis, prescription, or device order.

Inferenceofflineeip155:8453Exactvia cdp
https://api.magentlab.com/api/calc/shfm
Seattle-hfHeart-failureHemodynamicsSurvivalCalculator
Calls · 30d
1→ 0%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 5 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.
1
Calls · 30d
Upstream's own call count for this endpoint, not ours.
1
Unique payers · 30d
Last called 2026-09-04 05:50Z
—
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.

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    "description": "Levy 2006 Seattle Heart Failure Model 1-, 2-, and 3-year survival from Table 2 multivariate HRs. Score = sum of ln(HR)*x; S(t)=exp(-0.0405*t)**exp(score). Age, sex, NYHA, EF, ischemic etiology, SBP, furosemide-eq diuretic, labs, and already-on ACEI, beta-blocker, ARB, K-sparing diuretic, statin, BiV, ICD, or BiV-ICD. Caller assigns class, etiology, and therapy. magent does not measure labs or blood pressure. Not a diagnosis, prescription, or device order.",
    "serviceName": "magent"
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  "extensions": {
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            "formula": "shfm",
            "citation": {
              "id": "levy-2006-shfm",
              "doi": "10.1161/CIRCULATIONAHA.105.584102",
              "pmid": "16534009",
              "title": "The Seattle Heart Failure Model: Prediction of Survival in Heart Failure",
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            "sodium_meq_l": 140,
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            "k_sparing_diuretic": false,
            "lymphocyte_percent": 25,
            "survival_1y_percent": 96.4,
            "survival_2y_percent": 93,
            "survival_3y_percent": 89.7,
            "total_cholesterol_mg_dl": 180,
            "diuretic_furosemide_eq_mg_kg_day": 0,
            "loop_diuretic_furosemide_eq_mg_day": 0
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            "properties": {
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                  "DELETE"
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                "type": "string"
              },
              "headers": {
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                "additionalProperties": {
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                }
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              "queryParams": {
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                "required": [
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                  "sex",
                  "nyha",
                  "ef_percent",
                  "ischemic",
                  "sbp_mm_hg",
                  "weight_kg",
                  "loop_diuretic_furosemide_eq_mg_day",
                  "allopurinol",
                  "sodium_meq_l",
                  "total_cholesterol_mg_dl",
                  "hemoglobin_g_dl",
                  "lymphocyte_percent",
                  "uric_acid_mg_dl",
                  "ace_inhibitor",
                  "beta_blocker",
                  "arb",
                  "k_sparing_diuretic",
                  "statin",
                  "biv_pacemaker",
                  "icd",
                  "biv_icd"
                ],
                "properties": {
                  "age": {
                    "type": "integer",
                    "description": "Age in years (integer 14-100). Levy 2006 Table 2: per decade, multivariate HR 1.090. magent does not take a date of birth."
                  },
                  "arb": {
                    "type": "boolean",
                    "description": "Patient already on an angiotensin-receptor blocker as assigned by the caller (true or false). Table 2 already-on HR 0.85. Not a prescription."
                  },
                  "icd": {
                    "type": "boolean",
                    "description": "Patient already has an ICD (without biventricular pacing) as assigned by the caller (true or false). Table 2 already-on HR 0.73. Mutually exclusive with biv_pacemaker and biv_icd. Not a device order."
                  },
                  "sex": {
                    "enum": [
                      "female",
                      "male"
                    ],
                    "type": "string",
                    "description": "Sex used by the forced Table 2 male HR 1.089 (female or male). magent does not assign sex."
                  },
                  "nyha": {
                    "enum": [
                      1,
                      2,
                      3,
                      4
                    ],
                    "type": "integer",
                    "description": "NYHA class 1-4 as assigned by the caller (integer). Levy 2006 Table 2 multivariate HR 1.600 per class. magent does not examine the patient."
                  },
                  "statin": {
                    "type": "boolean",
                    "description": "Patient already on a statin as assigned by the caller (true or false). Table 2 already-on / multivariate HR 0.63. Not a prescription."
                  },
                  "biv_icd": {
                    "type": "boolean",
                    "description": "Patient already has a biventricular ICD as assigned by the caller (true or false). Table 2 already-on HR 0.79. Mutually exclusive with biv_pacemaker and icd. Not a device order."
                  },
                  "ischemic": {
                    "type": "boolean",
                    "description": "Ischemic etiology as assigned by the caller (true or false). Table 2 multivariate HR 1.354. magent does not assign etiology."
                  },
                  "sbp_mm_hg": {
                    "type": "number",
                    "description": "Systolic blood pressure in mm Hg (50-250). Table 2: per 10 mm Hg, HR 0.877, truncated at 160 (SBP 180 is scored as 160). magent does not measure blood pressure."
                  },
                  "weight_kg": {
                    "type": "number",
                    "description": "Body weight in kg (20-250) used only to convert the furosemide-equivalent diuretic dose to mg/kg/day. magent does not weigh the patient."
                  },
                  "ef_percent": {
                    "type": "number",
                    "description": "Left-ventricular ejection fraction in percent (1-80). Enters as 100/EF with Table 2 HR 1.030. magent does not interpret an echocardiogram."
                  },
                  "allopurinol": {
                    "type": "boolean",
                    "description": "Current allopurinol as assigned by the caller (true or false). Table 2 multivariate HR 1.571. magent does not prescribe allopurinol."
                  },
                  "beta_blocker": {
                    "type": "boolean",
                    "description": "Patient already on a beta-blocker as assigned by the caller (true or false). Table 2 already-on HR 0.66. Not a prescription."
                  },
                  "sodium_meq_l": {
                    "type": "number",
                    "description": "Serum sodium in mEq/L (110-160). Table 2: if Na<138, (138-Na) with HR 1.050 per mEq; values ≥138 add 0. magent does not assay sodium."
                  },
                  "ace_inhibitor": {
                    "type": "boolean",
                    "description": "Patient already on an ACE inhibitor as assigned by the caller (true or false). Table 2 already-on HR 0.77. Not a prescription."
                  },
                  "biv_pacemaker": {
                    "type": "boolean",
                    "description": "Patient already has a biventricular pacemaker (without ICD) as assigned by the caller (true or false). Table 2 already-on HR 1.00. Mutually exclusive with icd and biv_icd. Not a device order."
                  },
                  "hemoglobin_g_dl": {
                    "type": "number",
                    "description": "Hemoglobin in g/dL (4-22). Table 2: if Hb<16, (16-Hb) with HR 1.124 per g/dL; if Hb>16, (Hb-16) with HR 1.336 per g/dL. magent does not assay hemoglobin."
                  },
                  "uric_acid_mg_dl": {
                    "type": "number",
                    "description": "Serum uric acid in mg/dL (0.5-25). Table 2: per mg/dL when >3.4, HR 1.064; values <3.4 are truncated to 3.4. magent does not assay uric acid."
                  },
                  "k_sparing_diuretic": {
                    "type": "boolean",
                    "description": "Patient already on a potassium-sparing diuretic as assigned by the caller (true or false). Table 2 already-on HR 0.74. Not a prescription."
                  },
                  "lymphocyte_percent": {
                    "type": "number",
                    "description": "Percent lymphocytes (0-100). Table 2: per 5% when <47%, HR 0.897; values >47% are truncated to 47. magent does not assay a CBC."
                  },
                  "total_cholesterol_mg_dl": {
                    "type": "number",
                    "description": "Total cholesterol in mg/dL (50-800). Enters as 100/cholesterol with Table 2 HR 2.206. magent does not assay lipids."
                  },
                  "loop_diuretic_furosemide_eq_mg_day": {
                    "type": "number",
                    "description": "Daily loop-diuretic dose as furosemide milligram equivalent (0-1000). Paper conversion: furosemide 80 = torsemide 40 = bumetanide 3. Divided by weight_kg; Table 2 HR 1.178 per mg/kg/day. magent does not prescribe a diuretic."
                  }
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  },
  "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.

Paid to
0x836B…19Ee2
USD Coin contract
0x8335…02913
Payment window
10 minutes
As published
5000 smallest units
The catalog’s raw entry
[
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    "extra": {
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Extensions

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              "ischemic": false,
              "sbp_mm_hg": 120,
              "weight_kg": 80,
              "ef_percent": 30,
              "allopurinol": false,
              "beta_blocker": true,
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              "ace_inhibitor": true,
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              "hemoglobin_g_dl": 14,
              "uric_acid_mg_dl": 6,
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              "total_cholesterol_mg_dl": 180,
              "loop_diuretic_furosemide_eq_mg_day": 0
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          ]
        },
        "type": "http",
        "method": "POST"
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              "icd": false,
              "sex": "male",
              "nyha": 2,
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              "biv_icd": false,
              "formula": "shfm",
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                "doi": "10.1161/CIRCULATIONAHA.105.584102",
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                "title": "The Seattle Heart Failure Model: Prediction of Survival in Heart Failure",
                "source": "Circulation. 2006;113(11):1424-1433",
                "authors": "Levy WC, Mozaffarian D, Linker DT, Sutradhar SC, Anker SD, Cropp AB, et al."
              },
              "ischemic": false,
              "sbp_mm_hg": 120,
              "weight_kg": 80,
              "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.",
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              "beta_blocker": true,
              "sodium_meq_l": 140,
              "ace_inhibitor": true,
              "biv_pacemaker": false,
              "hemoglobin_g_dl": 14,
              "uric_acid_mg_dl": 6,
              "formula_expression": "score = sum(ln(HR)*x); S(t)=exp(-0.0405*t)**exp(score) for t years 0-5; Levy 2006 Table 2 multivariate HRs (italic β=ln(HR); medication/device = patient-already-on column); 1/2/3-year survival % round 1 decimal; age/10 * ln(1.090); male ln(1.089) (forced); NYHA * ln(1.600); (100/EF)*ln(1.030); ischemic ln(1.354); min(SBP,160)/10 * ln(0.877); furosemide-eq mg/kg/day * ln(1.178) (furosemide 80 = torsemide 40 = bumetanide 3); allopurinol ln(1.571); if Na<138: (138-Na)*ln(1.050); (100/cholesterol)*ln(2.206); if Hb<16: (16-Hb)*ln(1.124); if Hb>16: (Hb-16)*ln(1.336); min(%lymphocytes,47)/5 * ln(0.897); max(uric_acid,3.4)*ln(1.064); ACEI ln(0.77); beta-blocker ln(0.66); ARB ln(0.85); K-sparing diuretic ln(0.74); statin ln(0.63); BiV pacemaker ln(1.00); ICD ln(0.73); BiV-ICD ln(0.79); devices mutually exclusive; not a diagnosis or treatment/device order",
              "k_sparing_diuretic": false,
              "lymphocyte_percent": 25,
              "survival_1y_percent": 96.4,
              "survival_2y_percent": 93,
              "survival_3y_percent": 89.7,
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            },
            {
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              "icd": false,
              "sex": "male",
              "nyha": 2,
              "score": -0.1089,
              "statin": false,
              "biv_icd": false,
              "formula": "shfm",
              "citation": {
                "id": "levy-2006-shfm",
                "doi": "10.1161/CIRCULATIONAHA.105.584102",
                "pmid": "16534009",
                "title": "The Seattle Heart Failure Model: Prediction of Survival in Heart Failure",
                "source": "Circulation. 2006;113(11):1424-1433",
                "authors": "Levy WC, Mozaffarian D, Linker DT, Sutradhar SC, Anker SD, Cropp AB, et al."
              },
              "ischemic": false,
              "sbp_mm_hg": 120,
              "weight_kg": 80,
              "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.",
              "ef_percent": 30,
              "allopurinol": false,
              "beta_blocker": true,
              "sodium_meq_l": 140,
              "ace_inhibitor": true,
              "biv_pacemaker": false,
              "hemoglobin_g_dl": 14,
              "uric_acid_mg_dl": 6,
              "formula_expression": "score = sum(ln(HR)*x); S(t)=exp(-0.0405*t)**exp(score) for t years 0-5; Levy 2006 Table 2 multivariate HRs (italic β=ln(HR); medication/device = patient-already-on column); 1/2/3-year survival % round 1 decimal; age/10 * ln(1.090); male ln(1.089) (forced); NYHA * ln(1.600); (100/EF)*ln(1.030); ischemic ln(1.354); min(SBP,160)/10 * ln(0.877); furosemide-eq mg/kg/day * ln(1.178) (furosemide 80 = torsemide 40 = bumetanide 3); allopurinol ln(1.571); if Na<138: (138-Na)*ln(1.050); (100/cholesterol)*ln(2.206); if Hb<16: (16-Hb)*ln(1.124); if Hb>16: (Hb-16)*ln(1.336); min(%lymphocytes,47)/5 * ln(0.897); max(uric_acid,3.4)*ln(1.064); ACEI ln(0.77); beta-blocker ln(0.66); ARB ln(0.85); K-sparing diuretic ln(0.74); statin ln(0.63); BiV pacemaker ln(1.00); ICD ln(0.73); BiV-ICD ln(0.79); devices mutually exclusive; not a diagnosis or treatment/device order",
              "k_sparing_diuretic": false,
              "lymphocyte_percent": 25,
              "survival_1y_percent": 96.4,
              "survival_2y_percent": 93,
              "survival_3y_percent": 89.7,
              "total_cholesterol_mg_dl": 180,
              "diuretic_furosemide_eq_mg_kg_day": 0,
              "loop_diuretic_furosemide_eq_mg_day": 0
            }
          ]
        }
      },
      "iconUrl": "https://api.magentlab.com/favicon.ico"
    },
    "schema": {
      "type": "object",
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "required": [
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      ],
      "properties": {
        "input": {
          "type": "object",
          "required": [
            "type",
            "method"
          ],
          "properties": {
            "body": {
              "type": "object",
              "required": [
                "items"
              ],
              "properties": {
                "items": {
                  "type": "array",
                  "items": {
                    "type": "object",
                    "required": [
                      "age",
                      "sex",
                      "nyha",
                      "ef_percent",
                      "ischemic",
                      "sbp_mm_hg",
                      "weight_kg",
                      "loop_diuretic_furosemide_eq_mg_day",
                      "allopurinol",
                      "sodium_meq_l",
                      "total_cholesterol_mg_dl",
                      "hemoglobin_g_dl",
                      "lymphocyte_percent",
                      "uric_acid_mg_dl",
                      "ace_inhibitor",
                      "beta_blocker",
                      "arb",
                      "k_sparing_diuretic",
                      "statin",
                      "biv_pacemaker",
                      "icd",
                      "biv_icd"
                    ],
                    "properties": {
                      "age": {
                        "type": "integer",
                        "description": "Age in years (integer 14-100). Levy 2006 Table 2: per decade, multivariate HR 1.090. magent does not take a date of birth."
                      },
                      "arb": {
                        "type": "boolean",
                        "description": "Patient already on an angiotensin-receptor blocker as assigned by the caller (true or false). Table 2 already-on HR 0.85. Not a prescription."
                      },
                      "icd": {
                        "type": "boolean",
                        "description": "Patient already has an ICD (without biventricular pacing) as assigned by the caller (true or false). Table 2 already-on HR 0.73. Mutually exclusive with biv_pacemaker and biv_icd. Not a device order."
                      },
                      "sex": {
                        "enum": [
                          "female",
                          "male"
                        ],
                        "type": "string",
                        "description": "Sex used by the forced Table 2 male HR 1.089 (female or male). magent does not assign sex."
                      },
                      "nyha": {
                        "enum": [
                          1,
                          2,
                          3,
                          4
                        ],
                        "type": "integer",
                        "description": "NYHA class 1-4 as assigned by the caller (integer). Levy 2006 Table 2 multivariate HR 1.600 per class. magent does not examine the patient."
                      },
                      "statin": {
                        "type": "boolean",
                        "description": "Patient already on a statin as assigned by the caller (true or false). Table 2 already-on / multivariate HR 0.63. Not a prescription."
                      },
                      "biv_icd": {
                        "type": "boolean",
                        "description": "Patient already has a biventricular ICD as assigned by the caller (true or false). Table 2 already-on HR 0.79. Mutually exclusive with biv_pacemaker and icd. Not a device order."
                      },
                      "ischemic": {
                        "type": "boolean",
                        "description": "Ischemic etiology as assigned by the caller (true or false). Table 2 multivariate HR 1.354. magent does not assign etiology."
                      },
                      "sbp_mm_hg": {
                        "type": "number",
                        "description": "Systolic blood pressure in mm Hg (50-250). Table 2: per 10 mm Hg, HR 0.877, truncated at 160 (SBP 180 is scored as 160). magent does not measure blood pressure."
                      },
                      "weight_kg": {
                        "type": "number",
                        "description": "Body weight in kg (20-250) used only to convert the furosemide-equivalent diuretic dose to mg/kg/day. magent does not weigh the patient."
                      },
                      "ef_percent": {
                        "type": "number",
                        "description": "Left-ventricular ejection fraction in percent (1-80). Enters as 100/EF with Table 2 HR 1.030. magent does not interpret an echocardiogram."
                      },
                      "allopurinol": {
                        "type": "boolean",
                        "description": "Current allopurinol as assigned by the caller (true or false). Table 2 multivariate HR 1.571. magent does not prescribe allopurinol."
                      },
                      "beta_blocker": {
                        "type": "boolean",
                        "description": "Patient already on a beta-blocker as assigned by the caller (true or false). Table 2 already-on HR 0.66. Not a prescription."
                      },
                      "sodium_meq_l": {
                        "type": "number",
                        "description": "Serum sodium in mEq/L (110-160). Table 2: if Na<138, (138-Na) with HR 1.050 per mEq; values ≥138 add 0. magent does not assay sodium."
                      },
                      "ace_inhibitor": {
                        "type": "boolean",
                        "description": "Patient already on an ACE inhibitor as assigned by the caller (true or false). Table 2 already-on HR 0.77. Not a prescription."
                      },
                      "biv_pacemaker": {
                        "type": "boolean",
                        "description": "Patient already has a biventricular pacemaker (without ICD) as assigned by the caller (true or false). Table 2 already-on HR 1.00. Mutually exclusive with icd and biv_icd. Not a device order."
                      },
                      "hemoglobin_g_dl": {
                        "type": "number",
                        "description": "Hemoglobin in g/dL (4-22). Table 2: if Hb<16, (16-Hb) with HR 1.124 per g/dL; if Hb>16, (Hb-16) with HR 1.336 per g/dL. magent does not assay hemoglobin."
                      },
                      "uric_acid_mg_dl": {
                        "type": "number",
                        "description": "Serum uric acid in mg/dL (0.5-25). Table 2: per mg/dL when >3.4, HR 1.064; values <3.4 are truncated to 3.4. magent does not assay uric acid."
                      },
                      "k_sparing_diuretic": {
                        "type": "boolean",
                        "description": "Patient already on a potassium-sparing diuretic as assigned by the caller (true or false). Table 2 already-on HR 0.74. Not a prescription."
                      },
                      "lymphocyte_percent": {
                        "type": "number",
                        "description": "Percent lymphocytes (0-100). Table 2: per 5% when <47%, HR 0.897; values >47% are truncated to 47. magent does not assay a CBC."
                      },
                      "total_cholesterol_mg_dl": {
                        "type": "number",
                        "description": "Total cholesterol in mg/dL (50-800). Enters as 100/cholesterol with Table 2 HR 2.206. magent does not assay lipids."
                      },
                      "loop_diuretic_furosemide_eq_mg_day": {
                        "type": "number",
                        "description": "Daily loop-diuretic dose as furosemide milligram equivalent (0-1000). Paper conversion: furosemide 80 = torsemide 40 = bumetanide 3. Divided by weight_kg; Table 2 HR 1.178 per mg/kg/day. magent does not prescribe a diuretic."
                      }
                    }
                  },
                  "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
2026-09-04 05:50Z
Last indexed by Roundhouse
2026-09-07 06:20Z
Last enriched (probe, favicon, geo)
2026-09-12 15:45Z
x402 version
2
Max timeout
600s
Liveness probe
HTTP 0
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. 5 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/shfm, 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.