# FAA NAS Operational Disruption Causal-Chain Gauge (US Air Hub)

> FAA NAS Operational Disruption Causal-Chain Gauge (US Air Hub) 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 a real-time causal-chain snapshot of aviation disruptions at a US hub airport, linking upstream weather (METAR) to current FAA ground stops/delays and downstream network propagation for air-cargo and logistics intelligence.

## Facts

- Endpoint: GET https://aeml-x402.zeabur.app/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/faa-nas-operational-disruption-causal-chain-gauge-us-air-hub-efadb310
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ayMKuKxkR5MFBa6Uul-2c

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 faa-nas-operational-disruption-causal-chain-gauge-us-air-hub-efadb310
```

Example prompt: Pull the live FAA NAS disruption causal-chain for EWR right now — I need to know if there's a ground stop or GDP active, what weather is driving it (ceiling, visibility, convection), and whether the delays are propagating to downstream hubs for our air cargo exposure.

## When to prefer this

Use this endpoint when you need a real-time, single-airport, causal-chain view linking aviation weather (METAR) directly to active FAA NAS ground stop/delay programs and downstream air-cargo network exposure at US hub airports. Prefer this over general flight status APIs when the goal is logistics risk screening, freight exposure assessment, or understanding the weather-to-operations causal sequence rather than individual flight booking or tracking. Best suited for air cargo agents, logistics planners, and supply chain monitors who need verifiable, source-cited operational intelligence at screening level.

## Known failure modes

- Invalid or unknown airport code returns error or empty entity
- FAA or AviationWeather source temporarily unavailable causing stale data (indicated by freshness=stale in provenance)
- Data age may be non-zero if official sources have not updated recently
- Endpoint is screening-level only — not decision-grade for operational safety or flight dispatch
- Payment of 0.1 USDC required per call; unpaid requests return 402 Payment Required
- Downstream hub propagation data may lag behind primary airport status

## 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 realized delay (confirmation gate). A sequential 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.

## Output

A structured JSON object containing: the airport entity key, a causal-chain narrative across upstream weather legs (METAR cloud ceiling, visibility, convection, gusts), current FAA NAS ground stop/GDP/AFP/delay/closure status legs, realized delay metrics, downstream hub propagation and air-cargo freight exposure flags, a reason_category (WEATHER/VOLUME/EQUIPMENT/RUNWAY), sequential confidence scoring ('lights on' causal chain), freshness/provenance metadata with data age and lineage, a grade disclosure (screening-level), and an Ed25519-signed cryptographic citation for zero-trust verification.

## Request schema (JSON Schema)

```json
{
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "queryParams"
   ],
   "properties": {
    "type": {
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "entity"
     ],
     "properties": {
      "entity": {
       "type": "string",
       "examples": [
        "ewr",
        "lga",
        "jfk",
        "sfo",
        "ord",
        "bos"
       ],
       "description": "required - monitored object id, paired with signal_id; free list at GET /gauge/catalog?signal_id=<signal_id> -> signals[0].entities[]",
       "x-accepted-values": {
        "all": "https://api.truthbear.co/schemas/gauge-nas-region.input.json",
        "shown": 6,
        "total": 22
       }
      }
     },
     "additionalProperties": false
    }
   }
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "const": "json"
    },
    "example": {}
   }
  }
 }
}
```

## Response schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/faa-nas-operational-disruption-causal-chain-gauge-us-air-hub-efadb310/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)