# HALOWERK Central Land – Surface Aspect (Austria)

> HALOWERK Central Land – Surface Aspect (Austria) is a paid API for AI agents from mitteleuropa.halowerk.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-15).

Returns the circular direction (in degrees, clockwise from north) of the dominant surface gradient for a given coordinate within Austria.

## Facts

- Endpoint: POST https://mitteleuropa.halowerk.com/v1/at-aspect
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/halowerk-central-land-surface-aspect-austria-61ac318c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_KC3oaanYkOCMmlQN-08dk

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-central-land-surface-aspect-austria-61ac318c -d '<json body>'
```

Example prompt: What direction does the terrain slope at latitude 47.42, longitude 13.87 in Austria — give me the aspect angle clockwise from north.

## When to prefer this

Choose this endpoint when you need terrain aspect (slope-facing direction) specifically for a coordinate within Austria, validated against official Natural Earth boundaries, at low per-call cost. Prefer this over general-purpose DEM APIs when you want a pre-validated, Austria-scoped result without managing boundary checks yourself. It is part of a broader land surface analytics suite on the same host, making it easy to combine with elevation, slope, and soil data for the same point.

## Known failure modes

- Coordinate outside Austria boundary — rejected before payment, returns validation error
- Latitude or longitude outside the published European coverage range (lat 34–72.5, lon -31.5–40.5) — schema validation failure
- Ambiguous or missing coordinate fields — 400 bad request
- Service unavailable or upstream DEM data error — 5xx response

## How this service works

Circular direction of the dominant surface gradient, clockwise from north. The coordinate is validated against the Natural Earth boundary for Austria; results outside it are rejected before payment.

## Output

A numeric value representing the aspect angle in degrees (0–360), measured clockwise from north, indicating the direction the dominant surface gradient faces at the queried coordinate. Returns an error if the coordinate falls outside Austria's Natural Earth boundary.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "latitude": {
   "type": "number",
   "maximum": 72.5,
   "minimum": 34,
   "description": "WGS84 latitude inside the published European coverage."
  },
  "longitude": {
   "type": "number",
   "maximum": 40.5,
   "minimum": -31.5,
   "description": "WGS84 longitude inside the published European coverage."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/halowerk-central-land-surface-aspect-austria-61ac318c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mitteleuropa.halowerk.com](https://www.zero.xyz/host/mitteleuropa.halowerk.com/llms.txt)