# Aviation Ground-Stop Chain (NAS Region)

> Aviation Ground-Stop Chain (NAS Region) is a paid API for AI agents from api.truthbear.co, paid per call via x402, $0.25/call, status unknown (last checked 2026-09-13).

Returns a 3-leg sequential chain of aviation weather conditions, FAA NAS ground stops, and realized gate delays for a given US airport, with confidence scored by how many legs are active.

## Facts

- Endpoint: GET https://api.truthbear.co/gauge/nas-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/aviation-ground-stop-chain-nas-region-29783cca
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_TSJDRmZPgSUfNrGgqd7Ro

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 aviation-ground-stop-chain-nas-region-29783cca
```

Example prompt: What's the current ground-stop and delay situation at EWR — pull the full 3-leg chain including weather conditions, any active FAA NAS programs, and realized gate delays.

## When to prefer this

Choose this endpoint when you need a single call that aggregates aviation weather leading indicators, FAA NAS operational status, and realized gate delays for a specific US airport into a confidence-scored sequential chain. Prefer this over raw FAA or NWS feeds when you want pre-correlated, multi-source aviation situational awareness without building your own aggregation logic. Especially useful when you need to understand not just if a delay program exists but whether weather conditions support and gate delays confirm it.

## Known failure modes

- 422 no_charge returned when no live data is available for any leg — call is not billed
- Invalid or unsupported airport entity code returns an error
- Partial chain: one or more legs may be unlit if FAA or NWS sources are unavailable, lowering confidence score
- Network timeout or upstream source outage from FAA NAS or NWS METAR feeds

## How this service works

[3-LEG] Aviation ground-stop chain, one airport (?entity=ewr): leading aviation weather - METAR ceiling, visibility, convection and gusts -> current FAA NAS ground stops and delay programs -> realized delay (confirmation gate). A chain, not one reading: confidence = how many legs are lit, in order. Sources: FAA NAS Status, NWS METAR. Descriptive only, never a forecast or advice. No data -> 422 no_charge, not billed. $0.25 per call.

## Output

A JSON object representing a 3-leg sequential chain: Leg 1 contains METAR-derived aviation weather data (ceiling, visibility, convection, gusts) for the specified airport; Leg 2 contains current FAA NAS ground stop and delay program status; Leg 3 contains realized gate delay confirmation. A confidence score (0–3) reflects how many legs returned live data. Returns HTTP 422 with no_charge if no data is available, meaning the call is not billed.

## 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": [
        "ewr",
        "lga",
        "jfk",
        "sfo",
        "ord",
        "bos"
       ],
       "x-accepted-values": {
        "shown": 6,
        "total": 22,
        "all": "https://api.truthbear.co/schemas/gauge-nas-region.input.json"
       }
      }
     },
     "required": [
      "entity"
     ]
    }
   },
   "required": [
    "type",
    "method",
    "queryParams"
   ]
  },
  "output": {
   "type": "object",
   "properties": {
    "type": {
     "const": "json"
    },
    "example": {}
   },
   "required": [
    "type"
   ]
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "legs": {
   "ground_ops": {
    "band": "normal",
    "source_ref": "https://nasstatus.faa.gov/",
    "record_hash": "sha256:081b471e6ccdf63d45e4daf90698bba7215ed9571073e931c9b2e62b1fe84c5e"
   },
   "aviation_wx": {
    "band": "vfr_clear",
    "source_ref": "https://aviationweather.gov/",
    "record_hash": "sha256:035a23f3ca29509783992474ebb3290ac55e423a4e1ff68b621526c533170833"
   },
   "impact_cascade": {
    "band": "none",
    "source_ref": "https://nasstatus.faa.gov/",
    "record_hash": "sha256:bb7dcab20272e4d1a8b01dfbabbcbb5318ffe14ef484ec9e1eead2d5c07e7395"
   }
  },
  "name": "Newark Liberty Intl",
  "grade": "screening-level, not decision-grade",
  "scope": {
   "full": "https://api.truthbear.co/scope/v1",
   "verifiability": "unknown",
   "monitoring_not_forecast": true,
   "intelligence_not_command": true
  },
  "entity": "ewr",
  "nature": "This API supplies data organisation and trend description only. It is not a recommendation to act; the decision is yours. Purely descriptive - no judgement, no prediction. Official source plus record_hash; verify with the free /gauge/verify.",
  "provenance": {
   "freshness": "fresh",
   "age_hours_now": 0,
   "freshness_basis": "cadence=default; fresh<=24h; recent<=192h; dead_source>1440h; age_basis=request-time(now minus observed_at)"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/aviation-ground-stop-chain-nas-region-29783cca/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.truthbear.co](https://www.zero.xyz/host/api.truthbear.co/llms.txt)