# HALOWERK Central Land – Austria Solar Orientation Index

> HALOWERK Central Land – Austria Solar Orientation Index is a paid API for AI agents from mitteleuropa.halowerk.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-13).

Computes a south-facing slope orientation index from terrain aspect and slope for a given coordinate within Austria.

## Facts

- Endpoint: POST https://mitteleuropa.halowerk.com/v1/at-solar-orientation
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/halowerk-central-land-austria-solar-orientation-index-030b7a43
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_P3lFqYlSA9pUiZ-6Eb4ju

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-austria-solar-orientation-index-030b7a43 -d '<json body>'
```

Example prompt: What's the south-facing slope orientation index at latitude 47.32, longitude 13.85 in Austria? I need it to assess the solar potential of a hillside parcel.

## When to prefer this

Use this endpoint when you need a precise, index-based measure of how south-facing a slope is at a specific Austrian coordinate, particularly for solar energy assessments, agricultural suitability, or land development planning. It is Austria-specific and validates against official Natural Earth boundaries, making it more reliable than generic global terrain APIs for Austrian locations. Prefer this over elevation-only endpoints when solar orientation (aspect × slope composite) is the key variable.

## Known failure modes

- Coordinate outside Austria's Natural Earth boundary — request rejected before payment, error returned
- Latitude or longitude out of the accepted European coverage range (lat 34–72.5, lon -31.5–40.5) — validation error
- Invalid or missing coordinate values — schema validation failure
- DEM or aspect data unavailable for the specific location — data gap error

## How this service works

South-facing slope orientation index derived from aspect and slope. The coordinate is validated against the Natural Earth boundary for Austria; results outside it are rejected before payment.

## Output

Returns a numeric south-facing slope orientation index derived from terrain aspect and slope data for the given Austrian coordinate. Coordinates outside Austria's Natural Earth boundary are rejected before any charge is applied.

## 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-austria-solar-orientation-index-030b7a43/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)