US weather alerts

Active National Weather Service alerts for a US state as clean JSON: event, severity, headline, affected areas, onset/expiry. Send GET /api/weather-alerts with the required field area and pay $0.002 per call over x402 or MPP (there is no free tier). It returns a JSON object with area, count and alerts.

Live government data, no key. ?area=CA.

Category: Live public data · Tags: weather alerts nws noaa government

TRY IN PLAYGROUND →

Parameters

Example request

curl -i "https://agent402.tools/api/weather-alerts?area=CA"

Without payment this returns HTTP 402 Payment Required with the exact price for weather-alerts; any x402 v2 or MPP client pays it and retries.

Example response

{
  "area": "CA",
  "count": 2,
  "alerts": [
    {
      "event": "Red Flag Warning",
      "severity": "Severe",
      "headline": "…",
      "areas": "…",
      "onset": "2026-06-12T12:00:00-07:00",
      "expires": "…"
    }
  ]
}

From an MCP client

catalog.call {
  "slug": "weather-alerts",
  "params": {
    "area": "CA"
  }
}

The hosted connector at https://agent402.tools/mcp needs a payment for weather-alerts; the stdio package pays it from a wallet or from AGENT402_CREDITS_KEY. Local install: npx -y agent402-mcp.

Errors and behavior

• area is required. An input the tool rejects returns an HTTP 4xx whose body carries error, tool, expected, required and example, so the caller can correct it.
• A paid call that ends in any status of 400 or above is not charged over x402, MPP or a prepaid credits key: settlement is cancelled when the tool fails. The exception is a Tempo push credential, a transfer the buyer sent before the call: it settles before the tool runs, so if the tool then fails the payment is recorded as a refund owed to the paying wallet.
• Wallet-only: this tool reaches the network or stored state, so it has no proof-of-work tier. A prepaid card-credits key issued earlier (Authorization: Bearer a402_...) also pays it.
• Cached: an identical request within 5m is answered from cache with X-Cache: hit.
• A POST with a JSON body to /api/weather-alerts is served as this GET, with the body as the input.
• An Idempotency-Key header makes a retried paid call replay the first 200 instead of charging again (an answer larger than 1 MB is not replayed).

Paid call (JavaScript agent)

import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

const client = new x402Client();
client.setSpendControls?.(false); // keep your own spending ceiling in code
registerExactEvmScheme(client, { signer: privateKeyToAccount(KEY) });
const payFetch = wrapFetchWithPayment(fetch, client);

const res = await payFetch("https://agent402.tools/api/weather-alerts?area=CA");

Part of these workflows

US weather alerts is one step in this skill pack, each sold as a single call:

• Location intel - Point at an address (or even a rough place name) and assemble the situational brief: precise coordinates, the canonical postal address, what's within walking distance, the live weather forecast, active NWS hazard alerts, and recent seismic activity. The deterministic 'what should I know about this place right now?' workup.

Related tools