Agent Service · x402 · early usage

Powers 2018 Table 6 Class III Harm IVT

by api.magentlab.com · discovered, not yet claimed by its owner · updated 2026-10-13

30d calls5

30d payers2

MethodPOST

Outputjson

Mirrored from Coinbase's public x402 Bazaar. The description is the provider's own text and has not been reviewed here; the payment requirements are copied as published.

What it does

Powers 2018 Table 6 Class III Harm IVT. contraindicated iff any of 15 caller flags: CT ICH; recent ischemic stroke, severe head trauma, or intracranial/spinal surgery; posttraumatic infarction; history of ICH; SAH presentation; GI malignancy or bleed 21d; coagulopathy; LMWH 24h; DOAC not cleared; GP IIb/IIIa; infective endocarditis; aortic arch dissection; intra-axial neoplasm. Not Class I eligibility, time window, or a dose. magent does not read CT or assay labs. Not a treatment order.

Tags: ivt · alteplase · stroke · neurology · calculator · bazaar

Call contract

Method: POST
Input: HTTP request
Output: json
Last paid call: 2026-10-13

Input example from Bazaar metadata

{
  "items": [
    {
      "aortic_arch_dissection": false,
      "coagulopathy": false,
      "ct_ich": false,
      "doac_not_cleared": false,
      "gi_malignancy_or_gi_bleed_21d": false,
      "gp2b3a_concurrent": false,
      "history_ich": false,
      "infective_endocarditis": false,
      "intra_axial_neoplasm": false,
      "intracranial_spinal_surgery_within_3_mo": false,
      "ischemic_stroke_within_3_mo": false,
      "lmwh_treatment_dose_within_24h": false,
      "posttraumatic_infarction_in_hospital": false,
      "sah_presentation": false,
      "severe_head_trauma_within_3_mo": false
    },
    {
      "aortic_arch_dissection": false,
      "coagulopathy": false,
      "ct_ich": false,
      "doac_not_cleared": false,
      "gi_malignancy_or_gi_bleed_21d": false,
      "gp2b3a_concurrent": false,
      "history_ich": false,
      "infective_endocarditis": false,
      "intra_axial_neoplasm": false,
      "intracranial_spinal_surgery_within_3_mo": false,
      "ischemic_stroke_within_3_mo": false,
      "lmwh_treatment_dose_within_24h": false,
      "posttraumatic_infarction_in_hospital": false,
      "sah_presentation": false,
      "severe_head_trauma_within_3_mo": false
    }
  ]
}

Output example

{
  "count": 2,
  "items": [
    {
      "aortic_arch_dissection": false,
      "citation": {
        "authors": "Powers WJ, Rabinstein AA, Ackerson T, et al.",
        "doi": "10.1161/STR.0000000000000158",
        "id": "powers-2018",
        "pmid": "29133354",
        "source": "Stroke. 2018;49(3):e46-e110",
        "title": "2018 Guidelines for the Early Management of Patients With Acute Ischemic Stroke: A Guideline for Healthcare Professionals From the American Heart Association/American Stroke Association"
      },
      "coagulopathy": false,
      "contraindicated": false,
      "criteria": [
        {
          "factor": "ct_ich",
          "met": false
        },
        {
          "factor": "ischemic_stroke_within_3_mo",
          "met": false
        },
        {
          "factor": "severe_head_trauma_within_3_mo",
          "met": false
        },
        {
          "factor": "posttraumatic_infarction_in_hospital",
          "met": false
        },
        {
          "factor": "intracranial_spinal_surgery_within_3_mo",
          "met": false
        },
        {
          "factor": "history_ich",
          "met": false
        },
        {
          "factor": "sah_presentation",
          "met": false
        },
        {
          "factor": "gi_malignancy_or_gi_bleed_21d",
          "met": false
        },
        {
          "factor": "coagulopathy",
          "met": false
        },
        {
          "factor": "lmwh_treatment_dose_within_24h",
          "met": false
        },
        {
          "factor": "doac_not_cleared",
          "met": false
        },
        {
          "factor": "gp2b3a_concurrent",
          "met": false
        },
        {
          "factor": "infective_endocarditis",
          "met": false
        },
        {
          "factor": "aortic_arch_dissection",
          "met": false
        },
        {
          "factor": "intra_axial_neoplasm",
          "met": false
        },
        {
          "factor": "contraindicated",
          "met": false
        }
      ],
      "ct_ich": false,
      "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.",
      "doac_not_cleared": false,
      "formula": "ivt_contraindications",
      "formula_expression": "contraindicated iff ct_ich or ischemic_stroke_within_3_mo or severe_head_trauma_within_3_mo or posttraumatic_infarction_in_hospital or intracranial_spinal_surgery_within_3_mo or history_ich or sah_presentation or gi_malignancy_or_gi_bleed_21d or coagulopathy or lmwh_treatment_dose_within_24h or doac_not_cleared or gp2b3a_concurrent or infective_endocarditis or aortic_arch_dissection or intra_axial_neoplasm (Powers 2018 Table 6 Class III: Harm). Not Class III No Benefit (unclear/wake-up onset windows, extensive CT hypoattenuation). Not Class I eligibility. Not 0-3h vs 3-4.5h. Not a dose. magent does not read CT, assay coagulation, or examine the patient. Not a treatment order",
      "gi_malignancy_or_gi_bleed_21d": false,
      "gp2b3a_concurrent": false,
      "history_ich": false,
      "infective_endocarditis": false,
      "intra_axial_neoplasm": false,
      "intracranial_spinal_surgery_within_3_mo": false,
      "ischemic_stroke_within_3_mo": false,
      "lmwh_treatment_dose_within_24h": false,
      "posttraumatic_infarction_in_hospital": false,
      "sah_presentation": false,
      "severe_head_trauma_within_3_mo": false
    },
    {
      "aortic_arch_dissection": false,
      "citation": {
        "authors": "Powers WJ, Rabinstein AA, Ackerson T, et al.",
        "doi": "10.1161/STR.0000000000000158",
        "id": "powers-2018",
        "pmid": "29133354",
        "source": "Stroke. 2018;49(3):e46-e110",
        "title": "2018 Guidelines for the Early Management of Patients With Acute Ischemic Stroke: A Guideline for Healthcare Professionals From the American Heart Association/American Stroke Association"
      },
      "coagulopathy": false,
      "contraindicated": false,
      "criteria": [
        {
          "factor": "ct_ich",
          "met": false
        },
        {
          "factor": "ischemic_stroke_within_3_mo",
          "met": false
        },
        {
          "factor": "severe_head_trauma_within_3_mo",
          "met": false
        },
        {
          "factor": "posttraumatic_infarction_in_hospital",
          "met": false
        },
        {
          "factor": "intracranial_spinal_surgery_within_3_mo",
          "met": false
        },
        {
          "factor": "history_ich",
          "met": false
        },
        {
          "factor": "sah_presentation",
          "met": false
        },
        {
          "factor": "gi_malignancy_or_gi_bleed_21d",
          "met": false
        },
        {
          "factor": "coagulopathy",
          "met": false
        },
        {
          "factor": "lmwh_treatment_dose_within_24h",
          "met": false
        },
        {
          "factor": "doac_not_cleared",
          "met": false
        },
        {
          "factor": "gp2b3a_concurrent",
          "met": false
        },
        {
          "factor": "infective_endocarditis",
          "met": false
        },
        {
          "factor": "aortic_arch_dissection",
          "met": false
        },
        {
          "factor": "intra_axial_neoplasm",
          "met": false
        },
        {
          "factor": "contraindicated",
          "met": false
        }
      ],
      "ct_ich": false,
      "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.",
      "doac_not_cleared": false,
      "formula": "ivt_contraindications",
      "formula_expression": "contraindicated iff ct_ich or ischemic_stroke_within_3_mo or severe_head_trauma_within_3_mo or posttraumatic_infarction_in_hospital or intracranial_spinal_surgery_within_3_mo or history_ich or sah_presentation or gi_malignancy_or_gi_bleed_21d or coagulopathy or lmwh_treatment_dose_within_24h or doac_not_cleared or gp2b3a_concurrent or infective_endocarditis or aortic_arch_dissection or intra_axial_neoplasm (Powers 2018 Table 6 Class III: Harm). Not Class III No Benefit (unclear/wake-up onset windows, extensive CT hypoattenuation). Not Class I eligibility. Not 0-3h vs 3-4.5h. Not a dose. magent does not read CT, assay coagulation, or examine the patient. Not a treatment order",
      "gi_malignancy_or_gi_bleed_21d": false,
      "gp2b3a_concurrent": false,
      "history_ich": false,
      "infective_endocarditis": false,
      "intra_axial_neoplasm": false,
      "intracranial_spinal_surgery_within_3_mo": false,
      "ischemic_stroke_within_3_mo": false,
      "lmwh_treatment_dose_within_24h": false,
      "posttraumatic_infarction_in_hospital": false,
      "sah_presentation": false,
      "severe_head_trauma_within_3_mo": false
    }
  ],
  "path": "/api/calc/ivt_contraindications"
}

Use with an agent

Discover. Agents find this listing with GET https://bazaar.saylorinnovations.com/discovery/search?query=…, the MCP tool search_resources, or /discovery/resources.
Inspect. Fetch /resources/39151.json for the price and payment options.
Pay. Call GET https://api.magentlab.com/api/calc/ivt_contraindications. The provider answers 402 with its payment requirements. An x402 client signs one of the options below and retries with PAYMENT-SIGNATURE.
Execute. The provider returns 200 with the data. Agent Bazaar is not in the request path and never sees your payment.

For humans

You don't need an account or an API key; you need a wallet holding a small amount of USDC on Base, and an x402-capable client (see the examples below). Call the endpoint unpaid first to see exactly what it asks for.

Pricing & payment

Price: $0.005 / request
Protocol: x402 v2
Auth: No account or API key. Pay per request.
Networks: Base
Demand: 5 calls · 2 unique payers in 30d (public x402 Bazaar data)

x402 payment requirements

Scheme	Network	Asset	Amount	Pay to	Timeout
exact	Base eip155:8453	USDC	$0.005	0x836Be278f1739fB4308091cD1852F7971Bc19Ee2	600s

accepts[] (raw JSON)

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x836Be278f1739fB4308091cD1852F7971Bc19Ee2",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "5000",
    "amountUsd": 0.005,
    "maxTimeoutSeconds": 600
  }
]

Schemas

Output schema (JSON Schema)

{
  "properties": {
    "example": {
      "type": "object"
    },
    "type": {
      "type": "string"
    }
  },
  "required": [
    "type"
  ],
  "type": "object"
}

Example shape — generated from the schema, not a captured live response

{
  "example": {},
  "type": "string"
}

Examples

curl

curl "https://api.magentlab.com/api/calc/ivt_contraindications"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

JavaScript

const res = await fetch("https://api.magentlab.com/api/calc/ivt_contraindications");
if (res.status === 402) {
  const { accepts } = await res.json();
  // pay one of accepts[] via an x402 client, then retry with the payment header
}

Python

import httpx
res = httpx.get("https://api.magentlab.com/api/calc/ivt_contraindications")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header

Details

Provider: api.magentlab.com
Endpoint: https://api.magentlab.com/api/calc/ivt_contraindications
Machine-readable: /resources/39151.json