ToolVet
61trust / 100

Pressure Altitude

by Aviation Calculators in Other

x402 APIPassing, checked 4 h ago

Pressure altitude from field elevation and altimeter setting (inHg or hPa), exact ISA result and the 1000 ft per inHg rule.

GET
https://aviation-calc.x402tookit.com/pressure-altitude
Price
$0.02
per call in USDC
Uptime
64.3%
last 30 days
Response time
537 ms
1.2 s slowest 5%
Last check
Passed
4 h ago, next in 2 h

Run a free test callHow to call it

Reliability

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Status and outage history · Atom feed · Watch with other listings

How to call it

GET https://aviation-calc.x402tookit.com/pressure-altitude

Each call costs $0.02 in USDC on Polygon, paid with the request over x402.

Run a free test callOne unpaid request, the way an agent sends it. You see the payment challenge it gets back. Nothing is charged.

Example request

From the listing.

GET https://aviation-calc.x402tookit.com/pressure-altitude?altimeter=29.42&elevationFt=5000&unit=inhg

Parameters

ParameterTypeRequiredDescription
altimeternumberYesAltimeter setting (QNH): inHg like 29.92 or hPa like 1013
elevationFtnumberYesField or aircraft elevation in feet, -1500 to 30000
unitstringNoinhg (default) or hpa

Example response

The provider's example. We can't check it without paying.

{
  "altimeterHpa": 996.28,
  "altimeterInHg": 29.42,
  "asOf": "2026-10-11T14:44:08.837Z",
  "degraded": false,
  "differenceFromElevationFt": 450.7,
  "disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
  "elevationFt": 5000,
  "notChecked": [
    "temperature: pressure altitude ignores it (see /density-altitude)",
    "instrument error, local pressure changes since the setting was issued, and mountain-wave or frontal pressure effects",
    "…2 more"
  ],
  "pressureAltitudeFt": 5450.7,
  "pressureAltitudeRuleOfThumbFt": 5500,
  "reasons": [
    "Pressure altitude is the altitude in the standard atmosphere that has the station's pressure; set 29.92 inHg (1013.25 hPa) and the altimeter reads it.",
    "Station pressure comes from the altimeter setting on a standard lapse; then pressure altitude = ISA altitude at that pressure."
  ],
  "source": "computed locally",
  "stationPressureHpa": 828.95,
  "stationPressureInHg": 24.479,
  "summary": "At 5000 ft with an altimeter setting of 29.42 inHg (996.3 hPa) the pressure altitude is 5451 ft (the 1000 ft per inHg rule gives 5500 ft).",
  "verdict": "COMPUTED"
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.02.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://aviation-calc.x402tookit.com/pressure-altitude?altimeter=29.42&elevationFt=5000&unit=inhg'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - 'https://aviation-calc.x402tookit.com/pressure-altitude?altimeter=29.42&elevationFt=5000&unit=inhg' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode
JavaScript: pay and call
// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

// Pays at most $0.02 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.02" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.02 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Faviation-calc.x402tookit.com%2Fpressure-altitude
const res = await pay("https://aviation-calc.x402tookit.com/pressure-altitude?altimeter=29.42&elevationFt=5000&unit=inhg");
console.log(res.status, await res.text());
Python: pay and call
# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.02 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.02"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://aviation-calc.x402tookit.com/pressure-altitude?altimeter=29.42&elevationFt=5000&unit=inhg")
    print(res.status_code, res.text)

Security scan

No findings

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Recent checks

WhenResultHTTPTimePrice
4 h agoPassed402537 ms$0.02
17 h agoPassed4021.2 s$0.02
47 h agoExpected HTTP 402, got 530530108 ms-
3 days agoExpected HTTP 402, got 530530139 ms-
5 days agoExpected HTTP 402, got 530530137 ms-
Show 9 older checks
5 days agoExpected HTTP 402, got 530530147 ms-
5 days agoExpected HTTP 402, got 530530193 ms-
5 days agoPassed402197 ms$0.02
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7 days agoPassed402500 ms$0.02