# ArgonautWorks US Weather API

> ArgonautWorks US Weather API is a paid API for AI agents from argonaut-us-weather-api.vercel.app, paid per call via x402, $0.0012/call, status unknown (last checked 2026-09-14).

Returns a seven-day NWS forecast and active weather alerts for a given U.S. latitude/longitude coordinate

## Facts

- Endpoint: POST https://argonaut-us-weather-api.vercel.app/api/v1/forecast
- Price: $0.0012/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/argonautworks-us-weather-api-937473f3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_34T1hgcBId5_0Lw7vtxOW

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 argonautworks-us-weather-api-937473f3 -d '<json body>'
```

Example prompt: What's the official 7-day National Weather Service forecast and any active alerts for coordinates 38.8895 latitude, -77.0353 longitude near the National Mall in Washington DC?

## When to prefer this

Choose this endpoint when you need official, authoritative U.S. government (NWS) weather forecast data for a specific coordinate within the United States, especially when active severe weather alerts are also needed in the same call. It is ideal for US-only use cases requiring a compact 7-day outlook without needing to chain multiple API calls. Prefer it over commercial weather APIs when official NWS data is required for compliance, emergency planning, or government-aligned workflows.

## Known failure modes

- Coordinates outside the contiguous US or US territories may return no data or an error
- Invalid latitude/longitude values will result in a failed lookup
- NWS upstream API outages may cause timeouts or empty responses
- Coordinates over open ocean with no NWS grid coverage will fail
- Malformed POST body missing required lat/lon fields will return an error

## How this service works

A compact authoritative U.S. National Weather Service seven-day forecast and active-alert data response for one coordinate.

## Output

A JSON object containing a forecast array of named time periods (e.g. Tonight, Thursday, Thursday Night) each with a short forecast description, the echoed back location coordinates, and an array of any active NWS weather alerts for that area. The forecast spans approximately seven days of periods.

## 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": {
     "type": "object",
     "oneOf": [
      {
       "maxProperties": 0
      },
      {
       "required": [
        "lat",
        "lon"
       ]
      }
     ],
     "properties": {
      "lat": {
       "oneOf": [
        {
         "type": "string"
        },
        {
         "type": "number"
        }
       ],
       "example": 38.8895
      },
      "lon": {
       "oneOf": [
        {
         "type": "string"
        },
        {
         "type": "number"
        }
       ],
       "example": -77.0353
      }
     },
     "description": "Provide both coordinates, or use an empty object for the documented Washington, D.C. default.",
     "additionalProperties": false
    },
    "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": {
  "forecast": {
   "periods": [
    {
     "name": "Tonight",
     "short_forecast": "Mostly Clear"
    }
   ]
  },
  "location": {
   "latitude": 38.8895,
   "longitude": -77.0353
  },
  "active_alerts": []
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/argonautworks-us-weather-api-937473f3/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from argonaut-us-weather-api.vercel.app](https://www.zero.xyz/host/argonaut-us-weather-api.vercel.app/llms.txt)