# Halowerk Karte Airspace Check

> Halowerk Karte Airspace Check is a paid API for AI agents from karte.halowerk.com, paid per call via x402, $0.008/call, status unknown (last checked 2026-10-11).

Checks a coordinate, altitude, and time for current weather (Open-Meteo), nearby METAR observations, worldwide SIGMETs, FAA TFR NOTAM polygons with vertical/time limits, and broader NOTAMs if configured

## Facts

- Endpoint: POST https://karte.halowerk.com/v1/airspace-check?utm_source=zero.xyz
- Price: $0.008/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/halowerk-karte-airspace-check-2794f672
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ujDV7xmAdRhybuv_fn3wc

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 halowerk-karte-airspace-check-2794f672 -d '<json body>'
```

Example prompt: Before I launch my drone at 37.7749° N, 122.4194° W this Saturday at 2pm UTC, check for any active TFRs, SIGMETs, or airspace restrictions up to 120 meters AGL within 5 km of that position.

## When to prefer this

Choose this endpoint when you need a unified pre-flight or drone-launch airspace and weather check combining real-time weather (Open-Meteo), METAR, SIGMETs, and FAA TFR NOTAMs in a single call. Prefer it over manual AWC or FAA NOTAM lookups when you need coordinate-precise, altitude-aware, time-specific airspace status — especially for UAV/drone operations or general aviation pre-flight planning at a specific GPS point.

## Known failure modes

- Missing latitude or longitude returns a 400 validation error
- Altitude outside 0–20000m range is rejected
- Radius outside 1–100 km is rejected
- If no authorized NOTAM API is configured, full NOTAM data is unavailable and coverage is flagged as unknown
- AWC or Open-Meteo upstream outages may result in partial data with missing weather or SIGMET fields
- Payment failure via x402 results in 402 response before any data is returned

## How this service works

HALOWERK kartenwerk — bezahlte Endpunkte nach x402. Preise in USDC auf Base Mainnet.

## Output

Returns current weather data from Open-Meteo, nearby METAR station observations, active worldwide SIGMETs from the AWC, any FAA TFR NOTAM polygons intersecting the queried location/altitude/time with their vertical and time limits, broader NOTAMs if an authorized API is configured, and explicit flags distinguishing FAA TFR coverage from full NOTAM coverage — unknown coverage is reported as unknown rather than falsely clear.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "at": {
   "type": "string",
   "format": "date-time",
   "description": "UTC time to screen; current time is used when omitted."
  },
  "latitude": {
   "type": "number",
   "maximum": 90,
   "minimum": -90
  },
  "longitude": {
   "type": "number",
   "maximum": 180,
   "minimum": -180
  },
  "radius_km": {
   "type": "number",
   "default": 10,
   "maximum": 100,
   "minimum": 1
  },
  "altitude_m": {
   "type": "number",
   "maximum": 20000,
   "minimum": 0
  },
  "altitude_reference": {
   "enum": [
    "AGL",
    "MSL"
   ],
   "type": "string",
   "default": "AGL"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/halowerk-karte-airspace-check-2794f672/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from karte.halowerk.com](https://www.zero.xyz/host/karte.halowerk.com/llms.txt)