Market Data · x402 · early usage

Psychrometric calculator for HVAC engineering: from any two of dry bulb, wet bulb, dew…

Name: Psychrometric calculator for HVAC engineering: from any two of dry bulb, wet bulb, dew poi
Price: 0.002 USD
Availability: InStock

by x402-agent-api.onrender.com · discovered, not yet claimed by its owner · updated 2026-10-07

30d calls2

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

Psychrometric calculator for HVAC engineering: from any two of dry bulb, wet bulb, dew point, RH, humidity ratio, enthalpy or grains, the full moist-air state (plus specific volume, density, vapor pressure) at any elevation, IP or SI. ASHRAE Fundamentals 2021 equations, cross-checked against PsychroLib. Shows every step with the numbers and ASHRAE references. $0.002 USDC per call.

Tags: hvac · psychrometrics · engineering · mechanical-engineering · ashrae · bazaar

Call contract

Method: POST
Input: json
Output: json
Last paid call: 2026-10-07

Input example from Bazaar metadata

{
  "dry_bulb": 95,
  "elevation": 0,
  "wet_bulb": 75
}

Output example

{
  "elevation": 0,
  "inputs_used": {
    "dry_bulb": 95,
    "wet_bulb": 75
  },
  "next_calls": [
    {
      "arguments": {
        "airflow": 1000,
        "entering": {
          "dry_bulb": 95,
          "wet_bulb": 75
        },
        "leaving": {
          "dry_bulb": 55,
          "wet_bulb": 54
        },
        "units": "IP"
      },
      "price": "$0.002",
      "tool": "hvac_coil_load",
      "why": "What load does a coil carry cooling this air to 55/54 °F at 1000 CFM?"
    }
  ],
  "notes": [],
  "pressure": 14.696,
  "references": [
    "ASHRAE Handbook—Fundamentals (2021), Ch. 1 Psychrometrics"
  ],
  "state": {
    "density": 0.07092,
    "dew_point": 66.76,
    "dry_bulb": 95,
    "enthalpy": 38.316,
    "grains": 98.46,
    "humidity_ratio": 0.014065,
    "relative_humidity": 39.82,
    "specific_volume": 14.2995,
    "vapor_pressure": 0.325,
    "wet_bulb": 75
  },
  "steps": [
    {
      "calculation": "p = 14.696 × (1 − 6.8754×10⁻⁶ × Z)^5.2559 = 14.696 × (1 − 6.8754×10⁻⁶ × 0)^5.2559 = 14.6960 psia",
      "reference": "ASHRAE Handbook—Fundamentals (2021), Ch. 1 Psychrometrics, Eq. 3",
      "step": "Atmospheric pressure"
    },
    {
      "calculation": "pws(75.00 °F wet bulb) = 0.43007 psia (ASHRAE Ch. 1 Eq. 6)",
      "reference": "ASHRAE Handbook—Fundamentals (2021), Ch. 1 Psychrometrics",
      "step": "Humidity ratio"
    },
    {
      "calculation": "Ws* = 0.621945 × pws / (p − pws) = 0.018750 lb/lb (saturated at the wet bulb)",
      "reference": "ASHRAE Handbook—Fundamentals (2021), Ch. 1 Psychrometrics",
      "step": "Humidity ratio"
    }
  ],
  "unit_labels": {
    "airflow": "CFM",
    "area": "ft²",
    "condensate": "gal / h",
    "density": "lb / ft³",
    "elevation": "ft",
    "enthalpy": "BTU / lb dry air",
    "friction_rate": "in. w.g. / 100 ft",
    "grains": "gr / lb dry air",
    "humidity_ratio": "lb water / lb dry air",
    "length": "in",
    "load": "MBH (1,000 BTU/h)",
    "pressure": "psia",
    "relative_humidity": "%",
    "specific_volume": "ft³ / lb dry air",
    "temperature": "°F",
    "velocity": "FPM",
    "velocity_pressure": "in. w.g."
  },
  "units": "IP"
}

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/32864.json for the price and payment options.
Pay. Call GET https://x402-agent-api.onrender.com/api/v1/hvac-psychrometrics. 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: $0.002 / request
Protocol: x402 v2
Auth: No account or API key. Pay per request.
Networks: Base
Demand: 2 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	$0.002	0x6847231bD28E16A0A57c59793f6B8BD8CC0043aC	120s

accepts[] (raw JSON)

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x6847231bD28E16A0A57c59793f6B8BD8CC0043aC",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "2000",
    "amountUsd": 0.002,
    "maxTimeoutSeconds": 120
  }
]

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://x402-agent-api.onrender.com/api/v1/hvac-psychrometrics"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

JavaScript

const res = await fetch("https://x402-agent-api.onrender.com/api/v1/hvac-psychrometrics");
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://x402-agent-api.onrender.com/api/v1/hvac-psychrometrics")
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: x402-agent-api.onrender.com
Endpoint: https://x402-agent-api.onrender.com/api/v1/hvac-psychrometrics
Machine-readable: /resources/32864.json