weather.alerts

Live US severe-weather alerts from the National Weather Service. Pass a point ("lat,lon") to get every active watch, warning, and advisory for that exact location, or an area (2-letter US state or marine zone code) for area-wide alerts. Optionally filter by severity or urgency. Each alert returns the event type, severity, urgency, certainty, headline, affected-area description, issuing office, recommended public response, onset / expiry / end times, and the full hazard description plus protective-action instructions. Results are sorted most-severe first and capped by limit, with the true total reported. Public-domain NOAA / National Weather Service data, refreshed in real time.

price

$0.0012 USDC per call

method

GET/api/weather/alerts

payment

x402 v2 · USDC on Base (EIP-3009) or Solana (SPL transfer)

auth

None. Sign the payment, retry with PAYMENT-SIGNATURE.

tier

Tier 0 — no paid upstream

Parameters

Name	Type	Description
`point`	string	Exact location as "lat,lon" in decimal degrees, e.g. "25.7617,-80.1918". Returns alerts covering that point. Provide point OR area, not both.
`area`	string	2-letter US state / territory or NWS marine area code, e.g. "FL", "TX", "PK". Returns all active alerts for that area. Provide point OR area, not both.
`severity`	string	Filter to a single severity level. one of: Extreme \| Severe \| Moderate \| Minor \| Unknown
`urgency`	string	Filter to a single urgency level. one of: Immediate \| Expected \| Future \| Past \| Unknown
`limit`	integer	Max alerts to return (1-100, default 20). Most-severe first. min 1 · max 100

Code samples

cURLbash

# 1. Probe with no auth → 402 envelope with PaymentRequirements
curl -sS 'https://2s.io/api/weather/alerts?point=example&area=example&severity=Extreme&urgency=Immediate&limit=20'

# 2. Sign + retry with PAYMENT-SIGNATURE:
curl -sS 'https://2s.io/api/weather/alerts?point=example&area=example&severity=Extreme&urgency=Immediate&limit=20' \
  -H 'PAYMENT-SIGNATURE: <base64-json-payload>'

# Or use the canonical runner (handles probe → sign → retry):
#   EVM_PRIVATE_KEY=0x... node --env-file=.env.local \
#     --experimental-strip-types scripts/x402-pay.ts \
#     'https://2s.io/api/weather/alerts?point=example&area=example&severity=Extreme&urgency=Immediate&limit=20'

TypeScript / Node — @2sio/sdktypescript

import { TwoS } from '@2sio/sdk'

const client = new TwoS({
  privateKey: process.env.EVM_PRIVATE_KEY as `0x${string}`,
})

const result = await client.weather.alerts({
  "point": "example",
  "area": "example",
  "severity": "Extreme",
  "urgency": "Immediate",
  "limit": 20
})

console.log('endpoint:', result.endpoint)
console.log('cost:', result.costUsd, 'USDC')
console.log('tx:', result.settlement?.txHash)
console.log('data:', result.data)

Python — 2siopython

import os
from twosio import TwoS

client = TwoS(private_key=os.environ["EVM_PRIVATE_KEY"])

result = client.weather.alerts(point="example", area="example", severity="Extreme", urgency="Immediate", limit=20)

print("endpoint:", result.endpoint)
print("cost:", result.cost_usd, "USDC")
print("tx:", (result.settlement or {}).get("tx_hash"))
print("data:", result.data)

MCP — Claude Desktop / AgentKit / any MCP hostjson

// 1. Add @2sio/mcp to your MCP host config (Claude Desktop example below).
//    EVM_PRIVATE_KEY funds x402 payments per call.

// claude_desktop_config.json
{
  "mcpServers": {
    "2sio": {
      "command": "npx",
      "args": ["-y", "@2sio/mcp"],
      "env": { "EVM_PRIVATE_KEY": "0x..." }
    }
  }
}

// 2. Once the server is running, agents call this tool via standard MCP:

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "weather.alerts",
    "arguments": {
      "point": "example",
      "area": "example",
      "severity": "Extreme",
      "urgency": "Immediate",
      "limit": 20
    }
  }
}

Response

Field	Type	Description
`ok`	boolean	one of: true
`items`	array
`total`	integer	Total matching rows upstream; null when unknown.
`source`	object
`meta`	object

Example response datajson

{
  "ok": true,
  "items": [
    {
      "id": "example",
      "event": "example",
      "severity": "example",
      "urgency": "example",
      "certainty": "example",
      "category": "example",
      "headline": "example",
      "areaDescription": "example",
      "senderName": "example",
      "response": "example",
      "status": "example",
      "messageType": "example",
      "effective": "example",
      "onset": "example",
      "expires": "example",
      "ends": "example",
      "description": "example",
      "instruction": "example"
    }
  ],
  "total": 1,
  "source": {
    "provider": "example",
    "url": "example",
    "license": "example"
  },
  "meta": {
    "scope": {
      "point": {
        "lat": 1,
        "lon": 1
      },
      "area": "example"
    }
  }
}

Discovery

/api/directory — full catalog of every endpoint
/openapi.json — OpenAPI 3.1 spec (per-op x-payment-info, x402Payment security)
/.well-known/x402 — machine-readable service descriptor for x402-aware crawlers
/.well-known/mcp/server-card.json — MCP SEP-1649 server card
/llms.txt — plain-text manifest for LLM ingestion

2s.io is x402-native. Every call is paid per-request from a USDC-funded EVM wallet on Base — no signup, no API keys, no monthly fees. Source code: github.com/2s-io/sdk.