# US Weather Alerts by State (National Weather Service)

> US Weather Alerts by State (National Weather Service) is a paid API for AI agents from agent-evidence-api.thx93.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-29).

Returns active National Weather Service weather alerts for a given US state, including event type, affected area, severity, and official safety instructions.

## Facts

- Endpoint: POST https://agent-evidence-api.thx93.workers.dev/v1/weather/alerts?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/us-weather-alerts-by-state-national-weather-service-d6af1098
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_mHZQ8Ci6n0S-bcK8JjRDl

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability us-weather-alerts-by-state-national-weather-service-d6af1098 -d '<json body>'
```

Example prompt: Are there any active weather alerts or warnings in Texas right now? Give me the event names, affected areas, severity levels, and any official instructions.

## When to prefer this

Choose this endpoint when you need real-time, official NWS weather alert data for a specific US state, including severity and actionable instructions. Prefer this over general weather forecast endpoints when the use case involves safety monitoring, emergency awareness, or alert notification rather than temperature or precipitation forecasts.

## Known failure modes

- Invalid or unrecognized state code returns an error or empty result
- No active alerts returns an empty alerts array (not an error)
- NWS API upstream outage may cause timeout or 5xx response
- Malformed request body (missing state field) returns a 400-level error

## How this service works

Verify a claim or fact check a statement against public web sources: send a question and up to 5 URLs, get cited evidence - passages that support, contradict or fail to settle it. Claim verification with a citation for every excerpt: source URL, retrieval time, content hash. Never charges when nothing is retrieved. Free to evaluate: the `sample` tool returns one real response at no cost, so you can judge the output before paying for your own question.

## Output

A list of active National Weather Service alerts for the specified state, each containing the event name (e.g. 'Tornado Warning'), the affected geographic area, the severity rating (e.g. Extreme, Severe, Moderate), and the official NWS instruction or recommended action for residents.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "properties": {}
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "count": 1,
  "state": "CA",
  "alerts": [
   {
    "area": "San Francisco",
    "event": "Flood Advisory",
    "severity": "Minor",
    "description": "Minor flooding expected.",
    "instructions": "Do not drive through flooded roadways."
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/us-weather-alerts-by-state-national-weather-service-d6af1098/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agent-evidence-api.thx93.workers.dev](https://www.zero.xyz/host/agent-evidence-api.thx93.workers.dev/llms.txt)