Agent Service · x402 · early usage

Davis 2017 HEAVEN criteria from six caller-assigned flags: hypoxemia (SpO2 ≤93% at init…

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

Davis 2017 HEAVEN criteria from six caller-assigned flags: hypoxemia (SpO2 ≤93% at initial laryngoscopy as assigned), extremes of size (pediatric ≤8 years or clinical obesity as assigned), anatomic challenges, vomit/blood/fluid, exsanguination, and limited neck mobility. high_risk iff any is true; criteria_met is the count of true flags (0-6); low_risk iff none. Not an intubation order. magent does not measure SpO2 or examine the airway. Not Mallampati, not EGRI.

Tags: heaven · airway · emergency · intubation · calculator · bazaar

Call contract

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

Input example from Bazaar metadata

{
  "items": [
    {
      "anatomic_challenges": false,
      "exsanguination": false,
      "extremes_of_size": false,
      "hypoxemia": false,
      "neck_mobility_limited": false,
      "vomit_blood_fluid": false
    },
    {
      "anatomic_challenges": false,
      "exsanguination": false,
      "extremes_of_size": false,
      "hypoxemia": false,
      "neck_mobility_limited": false,
      "vomit_blood_fluid": false
    }
  ]
}

Output example

{
  "count": 2,
  "items": [
    {
      "citation": {
        "authors": "Davis DP, Olvera DJ",
        "doi": "10.1016/j.amj.2017.04.001",
        "id": "davis-2017",
        "pmid": "28739243",
        "source": "Air Med J. 2017;36(4):195-197",
        "title": "HEAVEN Criteria: Derivation of a New Difficult Airway Prediction Tool"
      },
      "criteria": [
        {
          "factor": "hypoxemia",
          "met": false
        },
        {
          "factor": "extremes_of_size",
          "met": false
        },
        {
          "factor": "anatomic_challenges",
          "met": false
        },
        {
          "factor": "vomit_blood_fluid",
          "met": false
        },
        {
          "factor": "exsanguination",
          "met": false
        },
        {
          "factor": "neck_mobility_limited",
          "met": false
        },
        {
          "factor": "high_risk_any",
          "met": false
        }
      ],
      "criteria_met": 0,
      "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.",
      "formula": "heaven",
      "formula_expression": "high_risk iff hypoxemia or extremes_of_size or anatomic_challenges or vomit_blood_fluid or exsanguination or neck_mobility_limited; low_risk iff not high_risk; criteria_met is the count of those six flags that are true (Davis 2017 HEAVEN; high_risk iff any of six caller-assigned flags)",
      "high_risk": false,
      "low_risk": true
    },
    {
      "citation": {
        "authors": "Davis DP, Olvera DJ",
        "doi": "10.1016/j.amj.2017.04.001",
        "id": "davis-2017",
        "pmid": "28739243",
        "source": "Air Med J. 2017;36(4):195-197",
        "title": "HEAVEN Criteria: Derivation of a New Difficult Airway Prediction Tool"
      },
      "criteria": [
        {
          "factor": "hypoxemia",
          "met": false
        },
        {
          "factor": "extremes_of_size",
          "met": false
        },
        {
          "factor": "anatomic_challenges",
          "met": false
        },
        {
          "factor": "vomit_blood_fluid",
          "met": false
        },
        {
          "factor": "exsanguination",
          "met": false
        },
        {
          "factor": "neck_mobility_limited",
          "met": false
        },
        {
          "factor": "high_risk_any",
          "met": false
        }
      ],
      "criteria_met": 0,
      "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.",
      "formula": "heaven",
      "formula_expression": "high_risk iff hypoxemia or extremes_of_size or anatomic_challenges or vomit_blood_fluid or exsanguination or neck_mobility_limited; low_risk iff not high_risk; criteria_met is the count of those six flags that are true (Davis 2017 HEAVEN; high_risk iff any of six caller-assigned flags)",
      "high_risk": false,
      "low_risk": true
    }
  ],
  "path": "/api/calc/heaven"
}

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/39118.json for the price and payment options.
Pay. Call GET https://api.magentlab.com/api/calc/heaven. 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/heaven"
# -> 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/heaven");
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/heaven")
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/heaven
Machine-readable: /resources/39118.json