Aviation Metar

{
  "count": 1,
  "not_found": [],
  "observations": [
    {
      "altimeter_hpa": 1010.9,
      "altimeter_inhg": 29.85,
      "ceiling_ft": 25000,
      "clouds": [
        {
          "base_ft": 25000,
          "cover": "BKN"
        }
      ],
      "dewpoint_c": 13.3,
      "elevation_m": 3,
      "flight_category": "VFR",
      "lat": 40.6392,
      "lon": -73.7639,
      "name": "New York/JF Kennedy Intl, NY, US",
      "observed_at": "2026-10-12T23:51:00.000Z",
      "raw": "METAR KJFK 122351Z 32009KT 10SM BKN250 19/13 A2985 RMK AO2 SLP109 T01940133 10233 20194 53019 $",
      "relative_humidity_pct": 68,
      "station": "KJFK",
      "temp_c": 19.4,
      "temp_f": 66.9,
      "visibility_sm": 10,
      "weather": null,
      "wind": {
        "direction_deg": 320,
        "gust_kt": null,
        "speed_kt": 9,
        "variable": false
      }
    }
  ],
  "source": "NOAA Aviation Weather Center"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://saylorinnovations.com/api/aviation/metar?ids=KJFK%2CKLAX'

# 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://saylorinnovations.com/api/aviation/metar?ids=KJFK%2CKLAX' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode

// 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 $0.01 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.01" });
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 $0.01 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fsaylorinnovations.com%2Fapi%2Faviation%2Fmetar
const res = await pay("https://saylorinnovations.com/api/aviation/metar?ids=KJFK%2CKLAX");
console.log(res.status, await res.text());

# 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 $0.01 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.01"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://saylorinnovations.com/api/aviation/metar?ids=KJFK%2CKLAX")
    print(res.status_code, res.text)