Agent Service · x402 · early usage

Stanghellini 2016 Rome IV chronic nausea vomiting syndrome (CNVS, B3a)

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

Stanghellini 2016 Rome IV chronic nausea vomiting syndrome (CNVS, B3a). rome_iv_cnvs is true iff bothersome nausea at least 1 day per week and/or one or more vomiting episodes per week as one flag, self-induced vomiting eating disorders regurgitation and rumination excluded, no organic systemic or metabolic explanation including at upper endoscopy, last-3-months criteria, and 6-month onset. magent does not take a history or read endoscopy. Not a diagnosis, not CVS, not CHS, not rumination.

Tags: rome-iv-cnvs · cnvs · gi · gastroduodenal · rome-iv · bazaar

Call contract

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

Input example from Bazaar metadata

{
  "items": [
    {
      "bothersome_nausea_or_vomiting_weekly": true,
      "fulfilled_last_3_months": true,
      "no_organic_systemic_metabolic_explanation": true,
      "onset_at_least_6_months": true,
      "self_induced_vomiting_eating_disorders_regurgitation_rumination_excluded": true
    },
    {
      "bothersome_nausea_or_vomiting_weekly": true,
      "fulfilled_last_3_months": true,
      "no_organic_systemic_metabolic_explanation": true,
      "onset_at_least_6_months": true,
      "self_induced_vomiting_eating_disorders_regurgitation_rumination_excluded": true
    }
  ]
}

Output example

{
  "count": 2,
  "items": [
    {
      "citation": {
        "authors": "Stanghellini V, Chan FKL, Hasler WL, Malagelada JR, Suzuki H, Tack J, Talley NJ",
        "doi": "10.1053/j.gastro.2016.02.011",
        "id": "stanghellini-2016",
        "pmid": "27147122",
        "source": "Gastroenterology. 2016;150(6):1380-1392",
        "title": "Gastroduodenal Disorders"
      },
      "criteria": [
        {
          "factor": "bothersome_nausea_or_vomiting_weekly",
          "met": true
        },
        {
          "factor": "self_induced_vomiting_eating_disorders_regurgitation_rumination_excluded",
          "met": true
        },
        {
          "factor": "no_organic_systemic_metabolic_explanation",
          "met": true
        },
        {
          "factor": "fulfilled_last_3_months",
          "met": true
        },
        {
          "factor": "onset_at_least_6_months",
          "met": 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": "rome_iv_cnvs",
      "formula_expression": "rome_iv_cnvs iff bothersome_nausea_or_vomiting_weekly and self_induced_vomiting_eating_disorders_regurgitation_rumination_excluded and no_organic_systemic_metabolic_explanation and fulfilled_last_3_months and onset_at_least_6_months (Stanghellini 2016 Rome IV chronic nausea vomiting syndrome)",
      "rome_iv_cnvs": true
    },
    {
      "citation": {
        "authors": "Stanghellini V, Chan FKL, Hasler WL, Malagelada JR, Suzuki H, Tack J, Talley NJ",
        "doi": "10.1053/j.gastro.2016.02.011",
        "id": "stanghellini-2016",
        "pmid": "27147122",
        "source": "Gastroenterology. 2016;150(6):1380-1392",
        "title": "Gastroduodenal Disorders"
      },
      "criteria": [
        {
          "factor": "bothersome_nausea_or_vomiting_weekly",
          "met": true
        },
        {
          "factor": "self_induced_vomiting_eating_disorders_regurgitation_rumination_excluded",
          "met": true
        },
        {
          "factor": "no_organic_systemic_metabolic_explanation",
          "met": true
        },
        {
          "factor": "fulfilled_last_3_months",
          "met": true
        },
        {
          "factor": "onset_at_least_6_months",
          "met": 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": "rome_iv_cnvs",
      "formula_expression": "rome_iv_cnvs iff bothersome_nausea_or_vomiting_weekly and self_induced_vomiting_eating_disorders_regurgitation_rumination_excluded and no_organic_systemic_metabolic_explanation and fulfilled_last_3_months and onset_at_least_6_months (Stanghellini 2016 Rome IV chronic nausea vomiting syndrome)",
      "rome_iv_cnvs": true
    }
  ],
  "path": "/api/calc/rome_iv_cnvs"
}

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/38844.json for the price and payment options.
Pay. Call GET https://api.magentlab.com/api/calc/rome_iv_cnvs. 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/rome_iv_cnvs"
# -> 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/rome_iv_cnvs");
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/rome_iv_cnvs")
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/rome_iv_cnvs
Machine-readable: /resources/38844.json