Roundhouse

magent

Tate 2019 VACS Index 2.0 (not 1.0): age, CD4, HIV-1 RNA, hemoglobin, caller-assigned FIB-4 and eGFR, hepatitis C, albumin, WBC, and BMI. Appendix Table 1 polynomials. Score scaled so the median profile is 44. Not a 5-year percent (no published S0). magent does not compute FIB-4 or eGFR and does not assign HIV status.

Mediaofflineeip155:8453Exactvia cdp
https://api.magentlab.com/api/calc/vacs_2
Vacs-2HivMortalityInfectionCalculator
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 05:52Z
—
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/vacs_2",
        "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/vacs_2",
    "tags": [
      "vacs-2",
      "hiv",
      "mortality",
      "infection",
      "calculator"
    ],
    "mimeType": "application/json",
    "description": "Tate 2019 VACS Index 2.0 (not 1.0): age, CD4, HIV-1 RNA, hemoglobin, caller-assigned FIB-4 and eGFR, hepatitis C, albumin, WBC, and BMI. Appendix Table 1 polynomials. Score scaled so the median profile is 44. Not a 5-year percent (no published S0). magent does not compute FIB-4 or eGFR and does not assign HIV status.",
    "serviceName": "magent"
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "age": 40,
            "fib4": 1,
            "bmi_kg_m2": 26,
            "wbc_10e9_l": 6,
            "hepatitis_c": false,
            "albumin_g_dl": 4.2,
            "cd4_cells_mm3": 600,
            "hemoglobin_g_dl": 15,
            "hiv_rna_copies_ml": 50,
            "egfr_ml_min_1_73m2": 100
          }
        },
        "output": {
          "type": "json",
          "example": {
            "age": 40,
            "fib4": 1,
            "score": 30,
            "formula": "vacs_2",
            "citation": {
              "id": "tate-2019-vacs-2",
              "doi": "10.1097/QAD.0000000000002140",
              "pmid": "30649088",
              "title": "Albumin, white blood cell count, and body mass index improve discrimination of mortality in HIV-positive individuals",
              "source": "AIDS. 2019;33(5):903-912",
              "authors": "Tate JP, Sterne JAC, Justice AC; Veterans Aging Cohort Study (VACS) and the Antiretroviral Therapy Cohort Collaboration (ART-CC)"
            },
            "bmi_kg_m2": 26,
            "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.",
            "wbc_10e9_l": 6,
            "hepatitis_c": false,
            "albumin_g_dl": 4.2,
            "cd4_cells_mm3": 600,
            "hemoglobin_g_dl": 15,
            "linear_predictor": -1.428513,
            "hiv_rna_copies_ml": 50,
            "egfr_ml_min_1_73m2": 100,
            "formula_expression": "lp = age_poly + cd4_poly + rna_poly + hb_poly + fib4_poly + egfr_spline + hcv + alb_poly + wbc_poly + bmi_poly; score = round(44 + 20*(lp - lp_median)); lp_median is Appendix Table 2 median profile (age 52, CD4 435, log10 HIV-1 RNA 1.7, Hb 14, FIB-4 1.34, eGFR 90, HCV no, albumin 4, WBC 5.5, BMI 25.3); age censored 30-75, X=(age-50)/5, PE 0.056/-0.004/0.005; CD4 censored 0-1000 as ln(max(1000-CD4, 1)), PE -0.056/-0.153/0.024; HIV-1 RNA log10 copies censored 1.3-5.0, centered (logVL-2), PE 0.513/-0.422/0.098; hemoglobin censored 9-16, centered (hemoglobin-14), PE -0.134/0.026/0.005; FIB-4 censored 0.5-7.5, PE 0.220/-0.009; eGFR censored 0-180, X1=eGFR/10, X2=max(eGFR-35,0)/10, X3=max(eGFR-65,0)/10, X4=max(eGFR-115,0)/10, PE -0.031/-0.077/0.106/0.133; HCV yes 0.342; albumin censored 2-5, centered (albumin-4), PE -0.443/0.104/0.028; WBC 10^9/L censored 2.5-11, centered (WBC-5.5), PE 0.126/0.020/-0.004; BMI censored 15-35, centered (BMI-25), PE -0.055/0.004; Tate 2019 Appendix Table 1 main analysis LVCF 180 days; caller-assigned FIB-4 and eGFR; not VACS 1.0; no published S0"
          }
        },
        "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": [
                  "age",
                  "cd4_cells_mm3",
                  "hiv_rna_copies_ml",
                  "hemoglobin_g_dl",
                  "fib4",
                  "egfr_ml_min_1_73m2",
                  "hepatitis_c",
                  "albumin_g_dl",
                  "wbc_10e9_l",
                  "bmi_kg_m2"
                ],
                "properties": {
                  "age": {
                    "type": "integer",
                    "description": "Age in years (integer 18-120). Tate 2019 Appendix Table 1 censors age at 30-75 and uses the cubic polynomial of (age-50)/5. magent does not assign age."
                  },
                  "fib4": {
                    "type": "number",
                    "description": "Caller-assigned FIB-4 (0.1-20). Appendix Table 1 censors at 0.5-7.5. magent does not recompute FIB-4."
                  },
                  "bmi_kg_m2": {
                    "type": "number",
                    "description": "Body mass index in kg/m² (10-60). Appendix Table 1 censors at 15-35 and centers at (BMI-25). magent does not compute BMI from height and weight."
                  },
                  "wbc_10e9_l": {
                    "type": "number",
                    "description": "White blood count in 10^9/L (0.5-50), equal to k/µL. Appendix Table 1 censors at 2.5-11 and centers at (WBC-5.5). magent does not assay WBC."
                  },
                  "hepatitis_c": {
                    "type": "boolean",
                    "description": "Caller-assigned hepatitis C co-infection (Tate 2019). true adds 0.342 to the linear predictor. magent does not diagnose hepatitis C."
                  },
                  "albumin_g_dl": {
                    "type": "number",
                    "description": "Serum albumin in g/dL (1-6.5). Appendix Table 1 censors at 2-5 and centers at (albumin-4). magent does not assay albumin."
                  },
                  "cd4_cells_mm3": {
                    "type": "integer",
                    "description": "CD4 count in cells/mm³ (integer 1-2000). Appendix Table 1 censors at 0-1000 and uses ln(max(1000-CD4, 1)). magent does not assay CD4."
                  },
                  "hemoglobin_g_dl": {
                    "type": "number",
                    "description": "Hemoglobin in g/dL (3-22). Appendix Table 1 censors at 9-16 and centers at (hemoglobin-14). magent does not assay hemoglobin."
                  },
                  "hiv_rna_copies_ml": {
                    "type": "number",
                    "description": "HIV-1 RNA in copies/mL (0-10000000). Appendix Table 1 uses log10 copies censored at 1.3-5.0 and centered at (logVL-2). magent does not assay viral load."
                  },
                  "egfr_ml_min_1_73m2": {
                    "type": "number",
                    "description": "Caller-assigned eGFR in mL/min/1.73m² (0-200). Appendix Table 1 censors at 0-180 and uses the footnote truncated linear terms at 35, 65, and 115. magent does not compute MDRD or CKD-EPI. Race is not an input."
                  }
                }
              }
            },
            "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.

Paid to
0x836B…19Ee2
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/vacs_2",
      "assetTransferMethod": "eip3009"
    },
    "payTo": "0x836Be278f1739fB4308091cD1852F7971Bc19Ee2",
    "amount": "5000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 600
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "body": {
          "items": [
            {
              "age": 40,
              "fib4": 1,
              "bmi_kg_m2": 26,
              "wbc_10e9_l": 6,
              "hepatitis_c": false,
              "albumin_g_dl": 4.2,
              "cd4_cells_mm3": 600,
              "hemoglobin_g_dl": 15,
              "hiv_rna_copies_ml": 50,
              "egfr_ml_min_1_73m2": 100
            },
            {
              "age": 40,
              "fib4": 1,
              "bmi_kg_m2": 26,
              "wbc_10e9_l": 6,
              "hepatitis_c": false,
              "albumin_g_dl": 4.2,
              "cd4_cells_mm3": 600,
              "hemoglobin_g_dl": 15,
              "hiv_rna_copies_ml": 50,
              "egfr_ml_min_1_73m2": 100
            }
          ]
        },
        "type": "http",
        "method": "POST"
      },
      "output": {
        "type": "json",
        "example": {
          "path": "/api/calc/vacs_2",
          "count": 2,
          "items": [
            {
              "age": 40,
              "fib4": 1,
              "score": 30,
              "formula": "vacs_2",
              "citation": {
                "id": "tate-2019-vacs-2",
                "doi": "10.1097/QAD.0000000000002140",
                "pmid": "30649088",
                "title": "Albumin, white blood cell count, and body mass index improve discrimination of mortality in HIV-positive individuals",
                "source": "AIDS. 2019;33(5):903-912",
                "authors": "Tate JP, Sterne JAC, Justice AC; Veterans Aging Cohort Study (VACS) and the Antiretroviral Therapy Cohort Collaboration (ART-CC)"
              },
              "bmi_kg_m2": 26,
              "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.",
              "wbc_10e9_l": 6,
              "hepatitis_c": false,
              "albumin_g_dl": 4.2,
              "cd4_cells_mm3": 600,
              "hemoglobin_g_dl": 15,
              "linear_predictor": -1.428513,
              "hiv_rna_copies_ml": 50,
              "egfr_ml_min_1_73m2": 100,
              "formula_expression": "lp = age_poly + cd4_poly + rna_poly + hb_poly + fib4_poly + egfr_spline + hcv + alb_poly + wbc_poly + bmi_poly; score = round(44 + 20*(lp - lp_median)); lp_median is Appendix Table 2 median profile (age 52, CD4 435, log10 HIV-1 RNA 1.7, Hb 14, FIB-4 1.34, eGFR 90, HCV no, albumin 4, WBC 5.5, BMI 25.3); age censored 30-75, X=(age-50)/5, PE 0.056/-0.004/0.005; CD4 censored 0-1000 as ln(max(1000-CD4, 1)), PE -0.056/-0.153/0.024; HIV-1 RNA log10 copies censored 1.3-5.0, centered (logVL-2), PE 0.513/-0.422/0.098; hemoglobin censored 9-16, centered (hemoglobin-14), PE -0.134/0.026/0.005; FIB-4 censored 0.5-7.5, PE 0.220/-0.009; eGFR censored 0-180, X1=eGFR/10, X2=max(eGFR-35,0)/10, X3=max(eGFR-65,0)/10, X4=max(eGFR-115,0)/10, PE -0.031/-0.077/0.106/0.133; HCV yes 0.342; albumin censored 2-5, centered (albumin-4), PE -0.443/0.104/0.028; WBC 10^9/L censored 2.5-11, centered (WBC-5.5), PE 0.126/0.020/-0.004; BMI censored 15-35, centered (BMI-25), PE -0.055/0.004; Tate 2019 Appendix Table 1 main analysis LVCF 180 days; caller-assigned FIB-4 and eGFR; not VACS 1.0; no published S0"
            },
            {
              "age": 40,
              "fib4": 1,
              "score": 30,
              "formula": "vacs_2",
              "citation": {
                "id": "tate-2019-vacs-2",
                "doi": "10.1097/QAD.0000000000002140",
                "pmid": "30649088",
                "title": "Albumin, white blood cell count, and body mass index improve discrimination of mortality in HIV-positive individuals",
                "source": "AIDS. 2019;33(5):903-912",
                "authors": "Tate JP, Sterne JAC, Justice AC; Veterans Aging Cohort Study (VACS) and the Antiretroviral Therapy Cohort Collaboration (ART-CC)"
              },
              "bmi_kg_m2": 26,
              "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.",
              "wbc_10e9_l": 6,
              "hepatitis_c": false,
              "albumin_g_dl": 4.2,
              "cd4_cells_mm3": 600,
              "hemoglobin_g_dl": 15,
              "linear_predictor": -1.428513,
              "hiv_rna_copies_ml": 50,
              "egfr_ml_min_1_73m2": 100,
              "formula_expression": "lp = age_poly + cd4_poly + rna_poly + hb_poly + fib4_poly + egfr_spline + hcv + alb_poly + wbc_poly + bmi_poly; score = round(44 + 20*(lp - lp_median)); lp_median is Appendix Table 2 median profile (age 52, CD4 435, log10 HIV-1 RNA 1.7, Hb 14, FIB-4 1.34, eGFR 90, HCV no, albumin 4, WBC 5.5, BMI 25.3); age censored 30-75, X=(age-50)/5, PE 0.056/-0.004/0.005; CD4 censored 0-1000 as ln(max(1000-CD4, 1)), PE -0.056/-0.153/0.024; HIV-1 RNA log10 copies censored 1.3-5.0, centered (logVL-2), PE 0.513/-0.422/0.098; hemoglobin censored 9-16, centered (hemoglobin-14), PE -0.134/0.026/0.005; FIB-4 censored 0.5-7.5, PE 0.220/-0.009; eGFR censored 0-180, X1=eGFR/10, X2=max(eGFR-35,0)/10, X3=max(eGFR-65,0)/10, X4=max(eGFR-115,0)/10, PE -0.031/-0.077/0.106/0.133; HCV yes 0.342; albumin censored 2-5, centered (albumin-4), PE -0.443/0.104/0.028; WBC 10^9/L censored 2.5-11, centered (WBC-5.5), PE 0.126/0.020/-0.004; BMI censored 15-35, centered (BMI-25), PE -0.055/0.004; Tate 2019 Appendix Table 1 main analysis LVCF 180 days; caller-assigned FIB-4 and eGFR; not VACS 1.0; no published S0"
            }
          ]
        }
      },
      "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": [
                      "age",
                      "cd4_cells_mm3",
                      "hiv_rna_copies_ml",
                      "hemoglobin_g_dl",
                      "fib4",
                      "egfr_ml_min_1_73m2",
                      "hepatitis_c",
                      "albumin_g_dl",
                      "wbc_10e9_l",
                      "bmi_kg_m2"
                    ],
                    "properties": {
                      "age": {
                        "type": "integer",
                        "description": "Age in years (integer 18-120). Tate 2019 Appendix Table 1 censors age at 30-75 and uses the cubic polynomial of (age-50)/5. magent does not assign age."
                      },
                      "fib4": {
                        "type": "number",
                        "description": "Caller-assigned FIB-4 (0.1-20). Appendix Table 1 censors at 0.5-7.5. magent does not recompute FIB-4."
                      },
                      "bmi_kg_m2": {
                        "type": "number",
                        "description": "Body mass index in kg/m² (10-60). Appendix Table 1 censors at 15-35 and centers at (BMI-25). magent does not compute BMI from height and weight."
                      },
                      "wbc_10e9_l": {
                        "type": "number",
                        "description": "White blood count in 10^9/L (0.5-50), equal to k/µL. Appendix Table 1 censors at 2.5-11 and centers at (WBC-5.5). magent does not assay WBC."
                      },
                      "hepatitis_c": {
                        "type": "boolean",
                        "description": "Caller-assigned hepatitis C co-infection (Tate 2019). true adds 0.342 to the linear predictor. magent does not diagnose hepatitis C."
                      },
                      "albumin_g_dl": {
                        "type": "number",
                        "description": "Serum albumin in g/dL (1-6.5). Appendix Table 1 censors at 2-5 and centers at (albumin-4). magent does not assay albumin."
                      },
                      "cd4_cells_mm3": {
                        "type": "integer",
                        "description": "CD4 count in cells/mm³ (integer 1-2000). Appendix Table 1 censors at 0-1000 and uses ln(max(1000-CD4, 1)). magent does not assay CD4."
                      },
                      "hemoglobin_g_dl": {
                        "type": "number",
                        "description": "Hemoglobin in g/dL (3-22). Appendix Table 1 censors at 9-16 and centers at (hemoglobin-14). magent does not assay hemoglobin."
                      },
                      "hiv_rna_copies_ml": {
                        "type": "number",
                        "description": "HIV-1 RNA in copies/mL (0-10000000). Appendix Table 1 uses log10 copies censored at 1.3-5.0 and centered at (logVL-2). magent does not assay viral load."
                      },
                      "egfr_ml_min_1_73m2": {
                        "type": "number",
                        "description": "Caller-assigned eGFR in mL/min/1.73m² (0-200). Appendix Table 1 censors at 0-180 and uses the footnote truncated linear terms at 35, 65, and 115. magent does not compute MDRD or CKD-EPI. Race is not an input."
                      }
                    }
                  },
                  "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 05:52Z
Last indexed by Roundhouse
2026-09-07 06:20Z
Last enriched (probe, favicon, geo)
2026-09-12 15:15Z
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/vacs_2, 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.