Agent Service · x402 · early usage

Christenson 2006 Vancouver Chest Pain Rule

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

30d calls6

30d payers3

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

Christenson 2006 Vancouver Chest Pain Rule. early_discharge_eligible is true when the initial ECG is not abnormal, 2-hour troponin is not elevated, there is no prior ACS or nitrate use, and either palpation reproduces pain or age is under 40 without radiation to neck, arm, or jaw. Age 40 is not the age-history path. magent does not interpret ECGs or assay troponin. Not the 2014 age-50 variant. Not a medical device and not a discharge order.

Tags: vancouver-chest-pain · acs · chest-pain · troponin · calculator · bazaar

Call contract

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

Input example from Bazaar metadata

{
  "items": [
    {
      "abnormal_initial_ecg": false,
      "age": 35,
      "pain_radiates_neck_jaw_arm": false,
      "palpation_reproduces_pain": false,
      "prior_acs_or_nitrate": false,
      "troponin_2h_elevated": false
    },
    {
      "abnormal_initial_ecg": false,
      "age": 35,
      "pain_radiates_neck_jaw_arm": false,
      "palpation_reproduces_pain": false,
      "prior_acs_or_nitrate": false,
      "troponin_2h_elevated": false
    }
  ]
}

Output example

{
  "count": 2,
  "items": [
    {
      "abnormal_initial_ecg": false,
      "age_years": 35,
      "citation": {
        "authors": "Christenson J, Innes G, McKnight D, et al.",
        "doi": "10.1016/j.annemergmed.2005.08.007",
        "id": "christenson-2006",
        "pmid": "16387209",
        "source": "Ann Emerg Med. 2006;47(1):1-10",
        "title": "A clinical prediction rule for early discharge of patients with chest pain"
      },
      "criteria": [
        {
          "factor": "normal_initial_ecg",
          "met": true,
          "value": false
        },
        {
          "factor": "troponin_2h_not_elevated",
          "met": true,
          "value": false
        },
        {
          "factor": "no_prior_acs_or_nitrate",
          "met": true,
          "value": false
        },
        {
          "factor": "palpation_or_age_history",
          "met": true,
          "value": 35
        }
      ],
      "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.",
      "early_discharge_eligible": true,
      "formula": "vancouver_chest_pain",
      "formula_expression": "early_discharge_eligible iff not abnormal_initial_ecg and not troponin_2h_elevated and not prior_acs_or_nitrate and (palpation_reproduces_pain or (age < 40 and not pain_radiates_neck_jaw_arm)); age 40 is not the age-history path (Christenson 2006 derivation tree; not Cullen 2014 / Scheuermeyer 2014 age 50)",
      "pain_radiates_neck_jaw_arm": false,
      "palpation_reproduces_pain": false,
      "prior_acs_or_nitrate": false,
      "troponin_2h_elevated": false
    },
    {
      "abnormal_initial_ecg": false,
      "age_years": 35,
      "citation": {
        "authors": "Christenson J, Innes G, McKnight D, et al.",
        "doi": "10.1016/j.annemergmed.2005.08.007",
        "id": "christenson-2006",
        "pmid": "16387209",
        "source": "Ann Emerg Med. 2006;47(1):1-10",
        "title": "A clinical prediction rule for early discharge of patients with chest pain"
      },
      "criteria": [
        {
          "factor": "normal_initial_ecg",
          "met": true,
          "value": false
        },
        {
          "factor": "troponin_2h_not_elevated",
          "met": true,
          "value": false
        },
        {
          "factor": "no_prior_acs_or_nitrate",
          "met": true,
          "value": false
        },
        {
          "factor": "palpation_or_age_history",
          "met": true,
          "value": 35
        }
      ],
      "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.",
      "early_discharge_eligible": true,
      "formula": "vancouver_chest_pain",
      "formula_expression": "early_discharge_eligible iff not abnormal_initial_ecg and not troponin_2h_elevated and not prior_acs_or_nitrate and (palpation_reproduces_pain or (age < 40 and not pain_radiates_neck_jaw_arm)); age 40 is not the age-history path (Christenson 2006 derivation tree; not Cullen 2014 / Scheuermeyer 2014 age 50)",
      "pain_radiates_neck_jaw_arm": false,
      "palpation_reproduces_pain": false,
      "prior_acs_or_nitrate": false,
      "troponin_2h_elevated": false
    }
  ],
  "path": "/api/calc/vancouver_chest_pain"
}

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/38916.json for the price and payment options.
Pay. Call GET https://api.magentlab.com/api/calc/vancouver_chest_pain. 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: 6 calls · 3 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/vancouver_chest_pain"
# -> 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/vancouver_chest_pain");
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/vancouver_chest_pain")
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/vancouver_chest_pain
Machine-readable: /resources/38916.json