Off Grid Weather Alarm

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://solar.halowerk.com/off-grid-weather-alarm' \
  -H 'content-type: application/json' \
  --data-raw '{"alert":{"minimum_duration_hours":6,"renewable_coverage_percent":50},"battery":{"capacity_wh":9600,"reserve_soc_percent":20,"soc_percent":72},"forecast_hours":72,"lat":52.52,"load_wh_per_day":4200,"lon":13.405,"solar":{"capacity_wp":2400,"performance_ratio":0.78},"wind":{"capacity_w":800,"cut_in_m_s":3,"cut_out_m_s":25,"rated_m_s":12}}'

# 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 - -X POST 'https://solar.halowerk.com/off-grid-weather-alarm' \
  -H 'content-type: application/json' \
  --data-raw '{"alert":{"minimum_duration_hours":6,"renewable_coverage_percent":50},"battery":{"capacity_wh":9600,"reserve_soc_percent":20,"soc_percent":72},"forecast_hours":72,"lat":52.52,"load_wh_per_day":4200,"lon":13.405,"solar":{"capacity_wp":2400,"performance_ratio":0.78},"wind":{"capacity_w":800,"cut_in_m_s":3,"cut_out_m_s":25,"rated_m_s":12}}' \
  | 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 $0.005 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.005" });
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 $0.005 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fsolar.halowerk.com%2Foff-grid-weather-alarm&method=POST
const res = await pay("https://solar.halowerk.com/off-grid-weather-alarm", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "alert": {
      "minimum_duration_hours": 6,
      "renewable_coverage_percent": 50
    },
    "battery": {
      "capacity_wh": 9600,
      "reserve_soc_percent": 20,
      "soc_percent": 72
    },
    "forecast_hours": 72,
    "lat": 52.52,
    "load_wh_per_day": 4200,
    "lon": 13.405,
    "solar": {
      "capacity_wp": 2400,
      "performance_ratio": 0.78
    },
    "wind": {
      "capacity_w": 800,
      "cut_in_m_s": 3,
      "cut_out_m_s": 25,
      "rated_m_s": 12
    }
  }),
});
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 $0.005 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.005"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://solar.halowerk.com/off-grid-weather-alarm",
        json={
            "alert": {
                "minimum_duration_hours": 6,
                "renewable_coverage_percent": 50,
            },
            "battery": {
                "capacity_wh": 9600,
                "reserve_soc_percent": 20,
                "soc_percent": 72,
            },
            "forecast_hours": 72,
            "lat": 52.52,
            "load_wh_per_day": 4200,
            "lon": 13.405,
            "solar": {
                "capacity_wp": 2400,
                "performance_ratio": 0.78,
            },
            "wind": {
                "capacity_w": 800,
                "cut_in_m_s": 3,
                "cut_out_m_s": 25,
                "rated_m_s": 12,
            },
        },
    )
    print(res.status_code, res.text)