# NHC Hurricane & Tropical Cyclone Causal Chain by Basin

> NHC Hurricane & Tropical Cyclone Causal Chain by Basin is a paid API for AI agents from aeml-x402.zeabur.app, paid per call via x402, $0.25/call, status unknown (last checked 2026-09-13).

Returns real-time NHC hurricane data per Atlantic/Pacific basin including formation outlook probabilities, active storm positions/intensity, and downstream impact cascades (energy, shipping, agriculture)

## Facts

- Endpoint: GET https://aeml-x402.zeabur.app/gauge/hurricane-region
- Price: $0.25/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/nhc-hurricane-tropical-cyclone-causal-chain-by-basin-88efc7ed
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_899dgwDeLKf5viIBLBjiE

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 nhc-hurricane-tropical-cyclone-causal-chain-by-basin-88efc7ed
```

Example prompt: Pull the full NHC hurricane causal chain for the Atlantic basin — I need the current GTWO formation probabilities for 2-day and 7-day, any active named storms with their Saffir-Simpson category and pressure, and the downstream impact picture for energy and shipping.

## When to prefer this

Choose this endpoint when you need an integrated, per-basin hurricane situation picture that combines NHC official formation probabilities, active storm metadata, and downstream sector impact cascades (energy, shipping, agriculture) in a single call. It is ideal for parametric insurance agents needing official trigger-level data, energy risk desks monitoring Gulf shutdown risk, and logistics agents assessing tropical hazard exposure — all requiring traceable NHC provenance rather than unofficial forecasts. Prefer alternatives if you need evacuation guidance, emergency management decisions, or non-tropical weather data.

## Known failure modes

- Invalid or missing entity parameter — must be one of atlantic, epacific, cpacific; returns 422 if unrecognized
- NHC source data temporarily unavailable — response may indicate stale freshness with elevated data_age_hours
- Payment not received or x402 flow incomplete — returns 402 before delivering data
- No active storms in basin — legs may be empty or minimal with note indicating quiet basin
- Rate limiting or upstream NOAA API outage — may return error or degraded response

## How this service works

[3-LEG] Hurricane chain, one basin (?entity=atlantic|epacific|cpacific): leading NHC official 2-day and 7-day genesis probability, QUOTED from NHC, never our forecast -> current active storms - category, wind, pressure, position -> realized official watches, warnings, landfall (confirmation gate). A sequential chain, not one reading - confidence = how many legs are lit, in order. Sources: NOAA NHC. Descriptive only, never a forecast or advice. No data -> 422 no_charge, not billed.

## Output

A structured response containing: the basin-level NHC GTWO formation probabilities (2-day and 7-day), active storm details (name, Saffir-Simpson category, central pressure, movement vector), official storm surge and hurricane warnings, downstream impact narrative covering energy (Gulf platform shutdowns), shipping disruption, and agricultural exposure, plus provenance metadata linking to official NHC sources with record hashes for verification. Includes a neutrality declaration (observation/trend, not forecast or advice) and optional Ed25519-signed citation block.

## Request schema (JSON Schema)

```json
{
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "properties": {
  "input": {
   "type": "object",
   "properties": {
    "type": {
     "const": "http"
    },
    "method": {
     "type": "string",
     "enum": [
      "GET"
     ]
    },
    "queryParams": {
     "type": "object",
     "additionalProperties": false,
     "properties": {
      "entity": {
       "type": "string",
       "description": "required - monitored object id, paired with signal_id; free list at GET /gauge/catalog?signal_id=<signal_id> -> signals[0].entities[]",
       "examples": [
        "atlantic",
        "epacific",
        "cpacific"
       ]
      }
     },
     "required": [
      "entity"
     ]
    }
   },
   "required": [
    "type",
    "method",
    "queryParams"
   ]
  },
  "output": {
   "type": "object",
   "properties": {
    "type": {
     "const": "json"
    },
    "example": {}
   },
   "required": [
    "type"
   ]
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/nhc-hurricane-tropical-cyclone-causal-chain-by-basin-88efc7ed/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from aeml-x402.zeabur.app](https://www.zero.xyz/host/aeml-x402.zeabur.app/llms.txt)