Agent Service · x402 · early usage

NEXUS Chest CT (Rodriguez 2015)

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

NEXUS Chest CT (Rodriguez 2015). Chest CT-Major is negative only when abnormal CXR, distracting injury, chest-wall, sternal, thoracic-spine, and scapular tenderness are all absent. Chest CT-All is negative only when those six and rapid deceleration mechanism are absent. Presence of a criterion does not mandate CT. Not a diagnosis, not the NEXUS Chest CXR instrument, and not Hoffman 2000 NEXUS C-spine. Enrolled blunt trauma age >14. magent does not examine the patient or read a radiograph.

Tags: nexus-chest-ct · chest-ct · trauma · emergency · calculator · bazaar

Call contract

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

Input example from Bazaar metadata

{
  "items": [
    {
      "abnormal_cxr": false,
      "chest_wall_tenderness": false,
      "distracting_injury": false,
      "rapid_deceleration_mechanism": false,
      "scapular_tenderness": false,
      "sternal_tenderness": false,
      "thoracic_spine_tenderness": false
    },
    {
      "abnormal_cxr": false,
      "chest_wall_tenderness": false,
      "distracting_injury": false,
      "rapid_deceleration_mechanism": false,
      "scapular_tenderness": false,
      "sternal_tenderness": false,
      "thoracic_spine_tenderness": false
    }
  ]
}

Output example

{
  "count": 2,
  "items": [
    {
      "citation": {
        "authors": "Rodriguez RM, Langdorf MI, Nishijima D, Baumann BM, Hendey GW, Medak AJ, Raja AS, Adelman EE, Mower WR",
        "doi": "10.1371/journal.pmed.1001883",
        "id": "rodriguez-2015",
        "pmid": "26440607",
        "source": "PLoS Med. 2015;12(10):e1001883",
        "title": "Derivation and Validation of Two Decision Instruments for Selective Chest CT in Blunt Trauma: A Multicenter Prospective Observational Study (NEXUS Chest CT)"
      },
      "criteria": [
        {
          "factor": "no_abnormal_cxr",
          "met": true
        },
        {
          "factor": "no_distracting_injury",
          "met": true
        },
        {
          "factor": "no_chest_wall_tenderness",
          "met": true
        },
        {
          "factor": "no_sternal_tenderness",
          "met": true
        },
        {
          "factor": "no_thoracic_spine_tenderness",
          "met": true
        },
        {
          "factor": "no_scapular_tenderness",
          "met": true
        },
        {
          "factor": "no_rapid_deceleration_mechanism",
          "met": true
        }
      ],
      "ct_all_negative": true,
      "ct_major_negative": true,
      "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": "nexus_chest_ct",
      "formula_expression": "ct_major_negative iff no abnormal_cxr and no distracting_injury and no chest_wall_tenderness and no sternal_tenderness and no thoracic_spine_tenderness and no scapular_tenderness; ct_all_negative iff Major-negative and no rapid_deceleration_mechanism"
    },
    {
      "citation": {
        "authors": "Rodriguez RM, Langdorf MI, Nishijima D, Baumann BM, Hendey GW, Medak AJ, Raja AS, Adelman EE, Mower WR",
        "doi": "10.1371/journal.pmed.1001883",
        "id": "rodriguez-2015",
        "pmid": "26440607",
        "source": "PLoS Med. 2015;12(10):e1001883",
        "title": "Derivation and Validation of Two Decision Instruments for Selective Chest CT in Blunt Trauma: A Multicenter Prospective Observational Study (NEXUS Chest CT)"
      },
      "criteria": [
        {
          "factor": "no_abnormal_cxr",
          "met": true
        },
        {
          "factor": "no_distracting_injury",
          "met": true
        },
        {
          "factor": "no_chest_wall_tenderness",
          "met": true
        },
        {
          "factor": "no_sternal_tenderness",
          "met": true
        },
        {
          "factor": "no_thoracic_spine_tenderness",
          "met": true
        },
        {
          "factor": "no_scapular_tenderness",
          "met": true
        },
        {
          "factor": "no_rapid_deceleration_mechanism",
          "met": true
        }
      ],
      "ct_all_negative": true,
      "ct_major_negative": true,
      "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": "nexus_chest_ct",
      "formula_expression": "ct_major_negative iff no abnormal_cxr and no distracting_injury and no chest_wall_tenderness and no sternal_tenderness and no thoracic_spine_tenderness and no scapular_tenderness; ct_all_negative iff Major-negative and no rapid_deceleration_mechanism"
    }
  ],
  "path": "/api/calc/nexus_chest_ct"
}

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/39006.json for the price and payment options.
Pay. Call GET https://api.magentlab.com/api/calc/nexus_chest_ct. 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/nexus_chest_ct"
# -> 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/nexus_chest_ct");
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/nexus_chest_ct")
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/nexus_chest_ct
Machine-readable: /resources/39006.json